Move memory limiting to capture level

Should have way better performance, and can fix a few bugs

.clabot

@@ -0,0 +1,3 @@
+{
+  "contributors": ["buger"]
+}

.deepsource.toml

@@ -0,0 +1,28 @@
+version = 1
+
+exclude_patterns = [
+  "vendor/**"
+]
+
+[[analyzers]]
+name = "go"
+enabled = true
+
+  [analyzers.meta]
+  import_paths = ["github.com/ankitdobhal/goreplay"]
+
+[[analyzers]]
+name = "docker"
+enabled = true
+
+[[analyzers]]
+name = "ruby"
+enabled = true
+
+[[analyzers]]
+name = "javascript"
+enabled = true
+
+  [analyzers.meta]
+  environment = ["nodejs"]
+

.dockerignore

@@ -0,0 +1,3 @@
+*.tar.gz
+gor
+gor.test

.github/dependabot.yaml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    pull-request-branch-name:
+      # Separate sections of the branch name with a hyphen
+      separator: "-"

.github/workflows/ci-docker.yaml

@@ -0,0 +1,38 @@
+name: ci
+on:
+  release:
+    types: [published]
+jobs:
+  docker-build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: "Checkout repository"
+        uses: actions/checkout@v2
+      -
+        name: "Set up Docker Buildx"
+        uses: docker/setup-buildx-action@v1
+      -
+        name: "Cache Docker layers"
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+      -
+        name: "Login to Container Registry"
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: "Build and push docker image"
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ${{ github.repository }}:${{ github.event.release.tag_name }}
+          build-args: RELEASE_VERSION=${{ github.event.release.tag_name }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,mode=max,dest=/tmp/.buildx-cache

.github/workflows/ci-test.yaml

@@ -0,0 +1,29 @@
+name: test
+on: [push, pull_request]
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [1.14.x, 1.15.x] # two latest minor versions
+    runs-on: ubuntu-latest
+    steps:
+    - name: update package index
+      run: sudo apt-get update
+    - name: install libpcap
+      run: sudo apt-get install libpcap-dev -y
+    - name: install Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go-version }}
+    - name: checkout code
+      uses: actions/checkout@v2
+    - uses: actions/cache@v2
+      with:
+        path: |
+          ~/go/pkg/mod              # Module download cache
+          ~/.cache/go-build         # Build cache (Linux)
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+    - name: test
+      run: sudo go test ./... -v -timeout 120s

.gitignore

@@ -1,2 +1,30 @@
 *.swp
 *.gor
+*.rpm
+*.dep
+*.pkg
+
+*.out
+
+*.bin
+
+*.gz
+*.zip
+
+*.class
+
+*.test
+.idea
+*.iml
+gor
+
+*.mprof
+
+*.pcap
+
+.DS_Store
+
+goreplay
+corpus
+crashers
+suppressions

.request

@@ -0,0 +1,5 @@
+POST /post HTTP/1.1
+Content-Length: 7
+Host: www.w3.org
+
+a=1&b=2

.travis.yml

@@ -1,3 +0,0 @@
-language: go 
-go: 1.3.3
-script: sudo -E bash -c "source /etc/profile && gvm use go1.3.3 && export GOPATH=$HOME/gopath:$GOPATH && go get && go test -v"

CHANGELOG.md

@@ -1,25 +0,0 @@
-v0.7.0 - 31 Oct 2013
-* New modular architecture. Listener and Replay functionality merged.
-* Added option to equally split traffic between multiple outputs: --split-output true
-* Saving requests to file and replaying from it
-* Injecting custom headers to http requests
-* Advanced stats using ElasticSearch
-
-v0.3.5 - 15 Sep 2013
-* Significantly improved test coverage
-* Fixed bug with redirect replay https://github.com/buger/gor/pull/15
-* Added limit on listener side
-* Improved stability (catch and log panic, instead of exiting)
-* Added License file
-
-v0.3.3 - 22 Jun 2013
-* Using TCP instead of UDP for communication between Listener and Replay
-* Significantly improved performance
-* Fixed bugs causing locking and message dropping (concurrency issues)
-* Rewrote concurrency model to use more channels
-
-v0.3 - 10 Jun 2013
-* Use RAW_SOCKETS instead of tcpdump
-* Own TCP stack
-* All HTTP request types support
-* Simplified request parsing

COMM-LICENSE

@@ -0,0 +1,94 @@
+END-USER LICENSE AGREEMENT
+
+------------------------------------------------------------------------------
+
+IMPORTANT: THIS SOFTWARE END-USER LICENSE AGREEMENT ("EULA") IS A LEGAL AGREEMENT (“Agreement”) BETWEEN YOU (THE CUSTOMER, EITHER AS AN INDIVIDUAL OR, IF PURCHASED OR OTHERWISE ACQUIRED BY OR FOR AN ENTITY, AS AN ENTITY) AND GoReplay LLC. READ IT CAREFULLY BEFORE COMPLETING THE INSTALLATION PROCESS AND USING GOREPLAY PRO AND RELATED SOFTWARE COMPONENTS (“SOFTWARE”). IT PROVIDES A LICENSE TO USE THE SOFTWARE AND CONTAINS WARRANTY INFORMATION AND LIABILITY DISCLAIMERS. BY INSTALLING AND USING THE SOFTWARE, YOU ARE CONFIRMING YOUR ACCEPTANCE OF THE SOFTWARE AND AGREEING TO BECOME BOUND BY THE TERMS OF THIS AGREEMENT.
+
+------------------------------------------------------------------------------
+
+In order to use the Software under this Agreement, you must receive a “Source URL” at the time of purchase, in accordance with the scope of use and other terms specified for each type of Software and as set forth in this Section 1 of this Agreement. 
+
+1. License Grant
+
+1.1 General Use. This Agreement grants you a non-exclusive, non-transferable, limited license to the use rights for the Software, without the right to grant sublicenses, subject to the terms and conditions in this Agreement. The Software is licensed, not sold.
+
+1.2 Unlimited Organization License. If you purchased an Organization License (included with the GoReplay Pro Software), you may install the Software on an unlimited number of Hosts. “Host” means any physical or virtual machine which is controlled by you. You may concurrently run the software on an unlimited number of Hosts.
+
+1.3 Appliance License. If you purchased an Appliance License, you may distribute the Software in any applications, frameworks, or elements (collectively referred to as an “Application” or “Applications”) that you develop using the Software in accordance with this EULA, provided that such distribution does not violate the restrictions set forth in section 3 of this EULA. You must not remove, obscure or interfere with any copyright, acknowledgment, attribution, trademark, warning or disclaimer statement affixed to, incorporated in or otherwise applied in connection with the Software. You are required to ensure that the Software is not reused by or with any applications other than those with which you distribute it as permitted herein. For example, if You install the Software on a customer’s server, that customer is not permitted to use the Software independently of your Application. You must inform GoReplay LLC of your knowledge of any infringing use of the Software by any of your customers. You are liable for compliance by those third parties with the terms and conditions of this EULA. You will not owe GoReplay LLC any royalties for your distribution of the Software in accordance with this EULA.
+
+1.4 Archive Copies. You are entitled to make a reasonable amount of copies of the Software for archival purposes. Each copy must reproduce all copyright and other proprietary rights notices on or in the Software Product.
+
+1.5 Electronic Delivery. All Software and license documentation shall be delivered by electronic means unless otherwise specified on the applicable invoice or at the time of purchase. Software shall be deemed delivered when it is made available for download by you (“Delivery”).        
+
+2. Modifications. GoReplay LLC shall provide you with source code so that you can create Modifications of the original software. “Modification” means: (a) any addition to or deletion from the contents of a file included in the original Software or previous Modifications created by You, or (b) any new file that contains any part of the original Software or previous Modifications. While you retain all rights to any original work authored by you as part of the Modifications, We continue to own all copyright and other intellectual property rights in the Software.
+
+3. Restricted Uses. 
+
+3.1 You shall not (and shall not allow any third party to): (a) decompile, disassemble, or otherwise reverse engineer the Software or attempt to reconstruct or discover any source code, underlying ideas, algorithms, file formats or programming interfaces of the Software by any means whatsoever (except and only to the extent that applicable law prohibits or restricts reverse engineering restrictions); (b) distribute, sell, sublicense, rent, lease or use the Software for time sharing, hosting, service provider or like purposes, except as expressly permitted under this Agreement; (c) redistribute the Software or Modifications other than by including the Software or a portion thereof within your own product, which must have substantially different functionality than the Software or Modifications and must not allow any third party to use the Software or Modifications, or any portions thereof, for software development or application development purposes; (d) redistribute the Software as part of a product, "appliance" or "virtual server"; (e) redistribute the Software on any server which is not directly under your control; (f) remove any product identification, proprietary, copyright or other notices contained in the Software; (g) modify any part of the Software, create a derivative work of any part of the Software (except as permitted in Section 4), or incorporate the Software, except to the extent expressly authorized in writing by GoReplay LLC; (h) publicly disseminate performance information or analysis (including, without limitation, benchmarks) from any source relating to the Software; (i) utilize any equipment, device, software, or other means designed to circumvent or remove any form of Source URL or copy protection used by GoReplay LLC in connection with the Software, or use the Software together with any authorization code, Source URL, serial number, or other copy protection device not supplied by GoReplay LLC; (j) use the Software to develop a product which is competitive with any GoReplay LLC product offerings; or (k) use unauthorized Source URLS or keycode(s) or distribute or publish Source URLs or keycode(s), except as may be expressly permitted by GoReplay LLC in writing. If your unique Source URL is ever published, GoReplay LLC reserves the right to terminate your access without notice.
+
+3.2 UNDER NO CIRCUMSTANCES MAY YOU USE THE SOFTWARE AS PART OF A PRODUCT OR SERVICE THAT PROVIDES SIMILAR FUNCTIONALITY TO THE SOFTWARE ITSELF.
+
+The Open Source version of the Software (“LGPL Version”) is licensed
+under the terms of the GNU Lesser General Public License versions 3.0
+(“LGPL”) and not under this EULA. 
+
+4. Ownership. Notwithstanding anything to the contrary contained herein, except for the limited license rights expressly provided herein, GoReplay LLC and its suppliers have and will retain all rights, title and interest (including, without limitation, all patent, copyright, trademark, trade secret and other intellectual property rights) in and to the Software and all copies, modifications and derivative works thereof (including any changes which incorporate any of your ideas, feedback or suggestions). You acknowledge that you are obtaining only a limited license right to the Software, and that irrespective of any use of the words “purchase”, “sale” or like terms hereunder no ownership rights are being conveyed to you under this Agreement or otherwise. 
+
+5. Fees and Payment. The Software license fees will be due and payable in full as set forth in the applicable invoice or at the time of purchase. If the Software does not function properly within two weeks of purchase, please contact us within those two weeks for a refund. You shall be responsible for all taxes, withholdings, duties and levies arising from the order (excluding taxes based on the net income of GoReplay LLC). 
+
+6. Support, Maintenance and Services. Subject to the terms and conditions of this Agreement, as set forth in your invoice, and as set forth on the GoReplay Pro support page (https://github.com/buger/goreplay/wiki/Pro-Support), support and maintenance services may be included with the purchase of your license subscription.
+
+7. Term of Agreement. 
+
+7.1 Term. This Agreement is effective as of the Delivery of the Software and expires at such time as all license and service subscriptions hereunder have expired in accordance with their own terms (the “Term”). For clarification, the term of your license under this Agreement may be perpetual, limited for Evaluation Version, or designated as a fixed-term license in the Invoice, and shall be specified at your time of purchase. Either party may terminate this Agreement (including all related Invoices) if the other party: (a) fails to cure any material breach of this Agreement within thirty (30) days after written notice of such breach, provided that GoReplay LLC may terminate this Agreement immediately upon any breach of Section 3 or if you exceed any other restrictions contained in Section 1, unless otherwise specified in this agreement; (b) ceases operation without a successor; or (c) seeks protection under any bankruptcy, receivership, trust deed, creditors arrangement, composition or comparable proceeding, or if any such proceeding is instituted against such party (and not dismissed within sixty (60) days)). Termination is not an exclusive remedy and the exercise by either party of any remedy under this Agreement will be without prejudice to any other remedies it may have under this Agreement, by law, or otherwise.        
+
+7.2 Termination. Upon any termination of this Agreement, you shall cease any and all use of any Software and destroy all copies thereof. 
+
+7.3 Expiration of License. Upon the expiration of any term under this Agreement, (a) all Software updates and services pursuant to the license shall cease, (b) you may only continue to run existing installations of the Software, (c) you may not install the Software on any additional Hosts, and (d) any new installation of the Software shall require the purchase of a new license subscription from GoReplay LLC.
+
+8. Disclaimer of Warranties. The Software is provided "as is," with all faults, defects and errors, and without warranty of any kind. GoReplay LLC does not warrant that the Software will be free of bugs, errors, viruses or other defects, and GoReplay LLC shall have no liability of any kind for the use of or inability to use the Software, the Software content or any associated service, and you acknowledge that it is not technically practicable for GoReplay LLC to do so. 
+To the maximum extent permitted by applicable law, GoReplay LLC disclaims all warranties, express, implied, arising by law or otherwise, regarding the Software, the Software content and their respective performance or suitability for your intended use, including without limitation any implied warranty of merchantability, fitness for a particular purpose.
+Notwithstanding the foregoing, GoReplay LLC represents and warrants that it either owns the entire right to, title to, interest in, or has the right to license, the Software, and your proper use of the same will not violate any intellectual property or proprietary rights of another.
+
+9. Limitation of Liability. 
+
+In no event will either party be liable for any direct, indirect, consequential, incidental, special, exemplary, or punitive damages or liabilities whatsoever arising from or relating to the Software, the Software content or this Agreement, whether based on contract, tort (including negligence), strict liability or other theory, even if such party has been advised of the possibility of such damages.
+
+In no event will GoReplay LLC liability exceed the Software license price as indicated in the invoice. The existence of more than one claim will not enlarge or extend this limit.
+
+10. Remedies. Your exclusive remedy and GoReplay LLC’ entire liability for breach of this Agreement shall be limited, at GoReplay LLC’ sole and exclusive discretion, to (a) replacement of any defective software or documentation; or (b) refund of the license fee paid to GoReplay LLC, payable in accordance with GoReplay LLC' refund policy.
+
+11. Acknowledgements.
+
+11.1 Consent to the Use of Data. You agree that GoReplay LLC and its affiliates may collect and use technical information gathered as part of the product support services to be used in an anonymized manner. GoReplay LLC may use this information solely to improve products and services and will not disclose this information in a form that personally identifies you.
+
+11.2 Verification. We or a certified auditor acting on our behalf, may, upon its reasonable request and at its expense, audit you with respect to the use of the Software, subject to your reasonable information security and confidentiality protections. Such audit may be conducted by mail, electronic means or through an in-person visit to your place of business. Any such in-person audit shall be conducted during regular business hours at your facilities and shall not unreasonably interfere with your business activities. We shall not remove, copy, or redistribute any electronic material during the course of an audit. If an audit reveals that you are using the Software in a way that is in material violation of the terms of the EULA, then you shall pay our reasonable costs of conducting the audit. In the case of a material violation, you agree to pay Us any amounts owing that are attributable to the unauthorized use. In the alternative, We reserve the right, at our sole option, to terminate the licenses for the Software.
+
+11.3 Government End Users. If the Software and related documentation are supplied to or purchased by or on behalf of the United States Government, then the Software is deemed to be "commercial software" as that term is used in the Federal Acquisition Regulation system. Rights of the United States shall not exceed the minimum rights set forth in FAR 52.227-19 for "restricted computer software". All other terms and conditions of this Agreement apply.
+
+12. Third Party Software.  Examples included in Software may provide links to third party libraries or code (collectively “Third Party Software”) to implement various functions. Third Party Software does not comprise part of the Software. In some cases, access to Third Party Software may be included along with the Software delivery as a convenience for demonstration purposes. Such source code and libraries may be included in the “…/examples” source tree delivered with the Software and do not comprise the Software. Licensee acknowledges (1) that some part of Third Party Software may require additional licensing of copyright and patents from the owners of such, and (2) that distribution of any of the Software referencing or including any portion of a Third Party Software may require appropriate licensing from such third parties.
+
+
+13. Miscellaneous
+
+13.1 Entire Agreement. This Agreement sets forth our entire agreement with respect to the Software and the subject matter hereof and supersedes all prior and contemporaneous understandings and agreements whether written or oral.
+
+13.2 Amendment. GoReplay LLC reserves the right, in its sole discretion, to amend this Agreement from time. Amendments to this Agreement can be located at: https://github.com/buger/goreplay/blob/master/COMM-LICENSE.
+
+13.3 Assignment. You may not assign this Agreement or any of its rights under this Agreement without the prior written consent of GoReplay LLC and any attempted assignment without such consent shall be void.
+
+13.4 Export Compliance. Each party agrees to comply with all applicable laws and regulations, including laws, regulations, orders or other restrictions on export, re-export or redistribution of software.
+
+13.5 Indemnification. You agree to defend, indemnify, and hold harmless GoReplay LLC from and against any lawsuits, claims, losses, damages, fines and expenses (including attorneys' fees and costs) arising out of your use of the Software or breach of this Agreement.
+
+13.6 Governing Law. This Agreement is governed by the laws of the State of Oregon and the United States without regard to conflicts of laws provisions thereof, and without regard to the United Nations Convention on the International Sale of Goods or the Uniform Computer Information Transactions Act, as currently enacted by any jurisdiction or as may be codified or amended from time to time by any jurisdiction. The jurisdiction and venue for actions related to the subject matter hereof shall be the state of Oregon and United States federal courts located in Portland, Oregon, and both parties hereby submit to the personal jurisdiction of such courts. 
+
+13.7 Attorneys’ Fees and Costs. The prevailing party in any action to enforce this Agreement will be entitled to recover its attorneys’ fees and costs in connection with such action. 
+
+13.8 Severability. If any provision of this Agreement is held by a court of competent jurisdiction to be invalid, illegal, or unenforceable, the remainder of this Agreement will remain in full force and effect.
+
+13.9 Waiver. Failure or neglect by either party to enforce at any time any of the provisions of this licence Agreement shall not be construed or deemed to be a waiver of that party's rights under this Agreement.
+
+13.10 Headings. The headings of sections and paragraphs of this Agreement are for convenience of reference only and are not intended to restrict, affect or be of any weight in the interpretation or construction of the provisions of such sections or paragraphs.
+
+14. Contact Information. If you have any questions about this EULA, or if you want to contact GoReplay LLC for any reason, please direct correspondence to info@gortool.com

Dockerfile

@@ -1,7 +1,11 @@
-FROM google/golang
+FROM alpine:3.12 as builder
 
-WORKDIR /gopath/src/gor
+ARG RELEASE_VERSION
 
-ADD . /gopath/src/gor
+RUN apk add --no-cache ca-certificates openssl
+RUN wget https://github.com/buger/goreplay/releases/download/${RELEASE_VERSION}/gor_${RELEASE_VERSION}_x64.tar.gz -O gor.tar.gz
+RUN tar xzf gor.tar.gz
 
-RUN go get
+FROM scratch
+COPY --from=builder /gor .
+ENTRYPOINT ["./gor"]

Dockerfile.dev

@@ -0,0 +1,14 @@
+FROM golang:1.14
+
+RUN apt-get update && apt-get install ruby vim-common -y
+
+RUN apt-get install flex bison -y
+RUN wget http://www.tcpdump.org/release/libpcap-1.9.1.tar.gz && tar xzf libpcap-1.9.1.tar.gz && cd libpcap-1.9.1 && ./configure && make install
+
+RUN go get github.com/google/gopacket
+RUN go get -u golang.org/x/lint/golint
+
+WORKDIR /go/src/github.com/buger/goreplay/
+ADD . /go/src/github.com/buger/goreplay/
+
+RUN go get

LICENSE.txt

@@ -1,191 +1,28 @@
-Apache License
-Version 2.0, January 2004
-http://www.apache.org/licenses/
+Copyright (c) 2011-present Leonid Bugaev
 
-TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+Portions of this software are licensed as follows:
 
-1. Definitions.
+* All content residing under the "doc/" directory of this repository is licensed under "Creative Commons: CC BY-SA 4.0 license".
+* Files with the following names "pro.go", "s3_reader.go", "output_s3.go" are released under the commercial license specified in "COMM-LICENSE" file.
+* Content outside of the above mentioned directories or restrictions above is available under the "LGPLv3" license as defined below.
 
-"License" shall mean the terms and conditions for use, reproduction, and
-distribution as defined by Sections 1 through 9 of this document.
 
-"Licensor" shall mean the copyright owner or entity authorized by the copyright
-owner that is granting the License.
+GoReplay is an Open Source project licensed under the terms of
+the LGPLv3 license.  Please see <http://www.gnu.org/licenses/lgpl-3.0.html>
+for license text.
 
-"Legal Entity" shall mean the union of the acting entity and all other entities
-that control, are controlled by, or are under common control with that entity.
-For the purposes of this definition, "control" means (i) the power, direct or
-indirect, to cause the direction or management of such entity, whether by
-contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the
-outstanding shares, or (iii) beneficial ownership of such entity.
+As a special exception to the GNU Lesser General Public License version 3
+("LGPL3"), the copyright holders of this Library give you permission to
+convey to a third party a Combined Work that links statically or dynamically
+to this Library without providing any Minimal Corresponding Source or
+Minimal Application Code as set out in 4d or providing the installation
+information set out in section 4e, provided that you comply with the other
+provisions of LGPL3 and provided that you meet, for the Application the
+terms and conditions of the license(s) which apply to the Application.
 
-"You" (or "Your") shall mean an individual or Legal Entity exercising
-permissions granted by this License.
+TLDR: You are free to use Gor subpackages like `byteutils` or `proto` in your commercial projects.
 
-"Source" form shall mean the preferred form for making modifications, including
-but not limited to software source code, documentation source, and configuration
-files.
 
-"Object" form shall mean any form resulting from mechanical transformation or
-translation of a Source form, including but not limited to compiled object code,
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-
-"Work" shall mean the work of authorship, whether in Source or Object form, made
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-any separate license agreement you may have executed with Licensor regarding
-such Contributions.
-
-6. Trademarks.
-
-This License does not grant permission to use the trade names, trademarks,
-service marks, or product names of the Licensor, except as required for
-reasonable and customary use in describing the origin of the Work and
-reproducing the content of the NOTICE file.
-
-7. Disclaimer of Warranty.
-
-Unless required by applicable law or agreed to in writing, Licensor provides the
-Work (and each Contributor provides its Contributions) on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied,
-including, without limitation, any warranties or conditions of TITLE,
-NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are
-solely responsible for determining the appropriateness of using or
-redistributing the Work and assume any risks associated with Your exercise of
-permissions under this License.
-
-8. Limitation of Liability.
-
-In no event and under no legal theory, whether in tort (including negligence),
-contract, or otherwise, unless required by applicable law (such as deliberate
-and grossly negligent acts) or agreed to in writing, shall any Contributor be
-liable to You for damages, including any direct, indirect, special, incidental,
-or consequential damages of any character arising as a result of this License or
-out of the use or inability to use the Work (including but not limited to
-damages for loss of goodwill, work stoppage, computer failure or malfunction, or
-any and all other commercial damages or losses), even if such Contributor has
-been advised of the possibility of such damages.
-
-9. Accepting Warranty or Additional Liability.
-
-While redistributing the Work or Derivative Works thereof, You may choose to
-offer, and charge a fee for, acceptance of support, warranty, indemnity, or
-other liability obligations and/or rights consistent with this License. However,
-in accepting such obligations, You may act only on Your own behalf and on Your
-sole responsibility, not on behalf of any other Contributor, and only if You
-agree to indemnify, defend, and hold each Contributor harmless for any liability
-incurred by, or claims asserted against, such Contributor by reason of your
-accepting any such warranty or additional liability.
-
-END OF TERMS AND CONDITIONS
-
-APPENDIX: How to apply the Apache License to your work
-
-To apply the Apache License to your work, attach the following boilerplate
-notice, with the fields enclosed by brackets "[]" replaced with your own
-identifying information. (Don't include the brackets!) The text should be
-enclosed in the appropriate comment syntax for the file format. We also
-recommend that a file or class name and description of purpose be included on
-the same "printed page" as the copyright notice for easier identification within
-third-party archives.
-
-   Copyright [yyyy] [name of copyright owner]
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-     http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
+GoReplay Pro has a commercial-friendly license allowing private forks
+and modifications of GoReplay.  Please see https://goreplay.org/pro.html for
+more detail.  You can find the commercial license terms in COMM-LICENSE.

Makefile

@@ -1,25 +1,146 @@
-SOURCE = emitter.go gor.go gor_stat.go input_dummy.go input_file.go input_raw.go input_tcp.go limiter.go output_dummy.go output_file.go output_http.go output_tcp.go plugins.go settings.go settings_header_filters.go settings_header_hash_filters.go settings_headers.go settings_methods.go settings_option.go settings_url_regexp.go test_input.go elasticsearch.go settings_url_map.go
+SOURCE = $(shell ls -1 *.go | grep -v _test.go)
+SOURCE_PATH = /go/src/github.com/buger/goreplay/
+PORT = 8000
+FADDR = :8000
+CONTAINER=gor
+PREFIX=
+RUN = docker run -v `pwd`:$(SOURCE_PATH) -e AWS_ACCESS_KEY_ID=$(AWS_ACCESS_KEY_ID) -e AWS_SECRET_ACCESS_KEY=$(AWS_SECRET_ACCESS_KEY) -p 0.0.0.0:$(PORT):$(PORT) -t -i $(CONTAINER)
+BENCHMARK = BenchmarkRAWInput
+TEST = TestRawListenerBench
+BIN_NAME = gor
+VERSION = DEV-$(shell date +%s)
+LDFLAGS = -ldflags "-X main.VERSION=$(VERSION)$(PREFIX) -extldflags \"-static\" -X main.DEMO=$(DEMO)"
+MAC_LDFLAGS = -ldflags "-X main.VERSION=$(VERSION)$(PREFIX) -X main.DEMO=$(DEMO)"
+FADDR = ":8000"
 
-all: build-x86 build-x64
+FPMCOMMON= \
+    --name goreplay \
+    --description "GoReplay is an open-source network monitoring tool which can record your live traffic, and use it for shadowing, load testing, monitoring and detailed analysis." \
+    -v $(VERSION) \
+    --vendor "Leonid Bugaev" \
+    -m "<support@goreplay.org>" \
+    --url "https://goreplay.org" \
+    -s dir \
+    -C /tmp/gor-build \
 
-build-x64:
-	GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build
-	tar -czf gor_x64.tar.gz gor
-	rm gor
+release: release-x64 release-mac
 
-build-x86:
-	GOOS=linux GOARCH=386 CGO_ENABLED=0 go build
-	tar -czf gor_x86.tar.gz gor
-	rm gor
+release-bin:
+	docker run -v `pwd`:$(SOURCE_PATH) -t --env GOOS=linux --env GOARCH=amd64  -i $(CONTAINER) go build -o $(BIN_NAME) -tags netgo $(LDFLAGS)
 
-dbuild:
-	docker build -t gor .
+release-bin-mac:
+	GOOS=darwin go build -o $(BIN_NAME) $(MAC_LDFLAGS)
 
-dtest:
-	docker run -v `pwd`:/gopath/src/gor -t -i gor go test -v
+release-x64:
+	docker run -v `pwd`:$(SOURCE_PATH) -t --env GOOS=linux --env GOARCH=amd64  -i $(CONTAINER) go build -o $(BIN_NAME) -tags netgo $(LDFLAGS)
+	tar -czf gor_$(VERSION)$(PREFIX)_x64.tar.gz $(BIN_NAME)
+	mkdir -p /tmp/gor-build
+	mv ./$(BIN_NAME) /tmp/gor-build/$(BIN_NAME)
+	cd /tmp/gor-build
+	rm -f goreplay_$(VERSION)_amd64.deb
+	rm -f goreplay-$(VERSION)-1.x86_64.rpm
+	fpm $(FPMCOMMON) -a amd64 -t deb ./=/usr/local/bin
+	fpm $(FPMCOMMON) -a amd64 -t rpm ./=/usr/local/bin
+	rm -rf /tmp/gor-build
 
-drun:
-	docker run -v `pwd`:/gopath/src/gor -t -i gor go run $(SOURCE) --input-dummy=0 --output-dummy=0 --verbose
+release-x86:
+	docker run -v `pwd`:$(SOURCE_PATH) -t --env GOOS=linux --env GOARCH=386 -i $(CONTAINER) go build -o $(BIN_NAME) -tags netgo $(LDFLAGS)
+	tar -czf gor_$(VERSION)$(PREFIX)_x86.tar.gz $(BIN_NAME)
+	rm $(BIN_NAME)
 
-dbash: 
-	docker run -v `pwd`:/gopath/src/gor -t -i gor /bin/bash
+release-mac:
+	go build -o $(BIN_NAME) $(MAC_LDFLAGS)
+	tar -czf gor_$(VERSION)$(PREFIX)_mac.tar.gz $(BIN_NAME)
+	mkdir -p /tmp/gor-build
+	mv ./$(BIN_NAME) /tmp/gor-build/$(BIN_NAME)
+	cd /tmp/gor-build
+	rm -f goreplay-$(VERSION).pkg
+	fpm $(FPMCOMMON) -a amd64 -t osxpkg ./=/usr/local/bin
+	rm -rf /tmp/gor-build
+
+
+install:
+	go install $(MAC_LDFLAGS)
+
+build:
+	docker build -t $(CONTAINER) -f Dockerfile.dev .
+
+profile:
+	go build && ./$(BIN_NAME) --output-http="http://localhost:9000" --input-dummy 0 --input-raw :9000 --input-http :9000 --memprofile=./mem.out --cpuprofile=./cpu.out --stats --output-http-stats --output-http-timeout 100ms
+
+lint:
+	$(RUN) golint $(PKG)
+
+race:
+	$(RUN) go test ./... $(ARGS) -v -race -timeout 15s
+
+test:
+	$(RUN) go test ./. -timeout 120s $(LDFLAGS) $(ARGS)  -v
+
+test_all:
+	$(RUN) go test ./... -timeout 120s $(LDFLAGS) $(ARGS) -v
+
+testone:
+	$(RUN) go test ./. -timeout 60s $(LDFLAGS) -run $(TEST) $(ARGS) -v
+
+cover:
+	$(RUN) go test $(ARGS) -race -v -timeout 15s -coverprofile=coverage.out
+	go tool cover -html=coverage.out
+
+fmt:
+	$(RUN) gofmt -w -s ./..
+
+vet:
+	$(RUN) go vet
+
+bench:
+	$(RUN) go test $(LDFLAGS) -v -run NOT_EXISTING -bench $(BENCHMARK) -benchtime 5s
+
+profile_test:
+	$(RUN) go test $(LDFLAGS) -run $(TEST) ./capture/. $(ARGS) -memprofile mem.mprof -cpuprofile cpu.out
+	$(RUN) go test $(LDFLAGS) -run $(TEST) ./capture/. $(ARGS) -c
+
+# Used mainly for debugging, because docker container do not have access to parent machine ports
+run:
+	$(RUN) go run $(LDFLAGS) $(SOURCE) --input-dummy=0 --output-http="http://localhost:9000" --input-raw-track-response --input-raw 127.0.0.1:9000 --verbose 0 --middleware "./examples/middleware/echo.sh" --output-file requests.gor
+
+run-2:
+	$(RUN) go run $(LDFLAGS) $(SOURCE) --input-raw :8000 --input-raw-bpf-filter "dst port 8000" --output-stdout --output-http "http://localhost:8000" --input-dummy=0
+
+run-3:
+	sudo -E go run $(SOURCE) --input-tcp :27001 --output-stdout
+
+run-arg:
+	sudo -E go run $(SOURCE) $(ARGS)
+
+file-server:
+	go run $(SOURCE) file-server $(FADDR)
+
+readpcap:
+	go run $(SOURCE) --input-raw $(FILE) --input-raw-track-response --input-raw-engine pcap_file --output-stdout
+
+record:
+	$(RUN) go run $(SOURCE) --input-dummy=0 --output-file=requests.gor --verbose --debug
+
+replay:
+	$(RUN) go run $(SOURCE) --input-file=requests.bin --output-tcp=:9000 --verbose -h
+
+bash:
+	$(RUN) /bin/bash
+
+
+FPMCOMMON= \
+    --name gor \
+    --description "GoReplay is an open-source network monitoring tool which can record your live traffic, and use it for shadowing, load testing, monitoring and detailed analysis." \
+    -v $(VERSION) \
+    --vendor "Leonid Bugaev" \
+    -m "<support@goreplay.org>" \
+    --url "https://goreplay.org" \
+    -s dir \
+    -C /tmp/gor-build \
+
+build_packages:
+	mkdir -p /tmp/gor-build
+	go build -i -o /tmp/gor-build/$(BIN_NAME)
+	fpm $(FPMCOMMON) -a amd64 -t deb ./=/usr/local/bin
+	fpm $(FPMCOMMON) -a amd64 -t rpm ./=/usr/local/bin

README.md

@@ -1,357 +1,73 @@
-[![Stories in Ready](https://badge.waffle.io/buger/gor.png?label=ready)](https://waffle.io/buger/gor)
-[![Build Status](https://travis-ci.org/buger/gor.png?branch=master)](https://travis-ci.org/buger/gor)
-
-## About
-
-Gor is a simple http traffic replication tool written in Go.
-Its main goal is to replay traffic from production servers to staging and dev environments.
-
-
-Now you can test your code on real user sessions in an automated and repeatable fashion.
-**No more falling down in production!**
-
-Here is basic workflow: The listener server catches http traffic and sends it to the replay server or saves to file.The replay server forwards traffic to a given address.
-
-
-![Diagram](http://i.imgur.com/9mqj2SK.png)
-
-
-## Examples
-
-### Capture traffic from port
-```bash
-# Run on servers where you want to catch traffic. You can run it on each `web` machine.
-sudo gor --input-raw :80 --output-tcp replay.local:28020
-
-# Replay server (replay.local).
-gor --input-tcp replay.local:28020 --output-http http://staging.com
-```
-
-### Using 1 Gor instance for both listening and replaying
-It's recommended to use separate server for replaying traffic, but if you have enough CPU resources you can use single Gor instance.
-
-```
-sudo gor --input-raw :80 --output-http "http://staging.com"
-```
-
-## Advanced use
-
-### Rate limiting
-Both replay and listener support rate limiting. It can be useful if you want
-forward only part of production traffic and not overload your staging
-environment. 
-Current throttling works like this: If for current second it reached specified requests limit - disregard the rest, on next second counter reseted.
-
-You can specify your desired requests per second using the
-"|" operator after the server address:
-
-#### Limiting replay
-```
-# staging.server will not get more than 10 requests per second
-gor --input-tcp :28020 --output-http "http://staging.com|10"
-```
-
-#### Limiting listener
-```
-# replay server will not get more than 10 requests per second
-# useful for high-load environments
-gor --input-raw :80 --output-tcp "replay.local:28020|10"
-```
-
-#### Match on regexp of url
-```
-# only forward requests being sent to the api... domains
-gor --input-raw :8080 --output-http staging.com --output-http-url-regexp ^www.
-```
-
-#### Filter based on regexp of header
-```
-# only forward requests with an api version of 1.0x
-gor --input-raw :8080 --output-http staging.com --output-http-header-filter api-version:^1\.0\d
-```
-
-#### Filter based on hash of header
-```
-# send 1/32 of all users consistently to staging
-gor --input-raw :8080 --output-http staging.com --output-http-header-hash-filter user-id:1/32
-```
-
-### Forward to multiple addresses
-
-You can forward traffic to multiple endpoints. Just add multiple --output-* arguments.
-```
-gor --input-tcp :28020 --output-http "http://staging.com"  --output-http "http://dev.com"
-```
-
-#### Splitting traffic
-By default it will send same traffic to all outputs, but you have options to equally split it:
-
-```
-gor --input-tcp :28020 --output-http "http://staging.com"  --output-http "http://dev.com" --split-output true
-```
-
-### Saving requests to file
-You can save requests to file, and replay them later:
-```
-# write to file
-gor --input-raw :80 --output-file requests.gor
-
-# read from file
-gor --input-file requests.gor --output-http "http://staging.com"
-```
-
-**Note:** Replay will preserve the original time differences between requests.
-
-### Injecting headers
-
-Additional headers can be injected/overwritten into requests during replay. This may be useful if you need to identify requests generated by Gor or enable feature flagged functionality in an application:
-
-```
-gor --input-raw :80 --output-http "http://staging.server" \
-    --output-http-header "User-Agent: Replayed by Gor" \
-    --output-http-header "Enable-Feature-X: true"
-```
-
-## Filtering HTTP methods
-
-Requests not matching a specified whitelist can be filtered out. For example to strip non-nullipotent requests:
-
-```
-gor --input-raw :80 --output-http "http://staging.server" \
-    --output-http-method GET \
-    --output-http-method OPTIONS
-```
-
-### Basic Auth
-
-If your development or staging environment is protected by Basic Authentication then those credentials can be injected in during the replay:
-
-```
-gor --input-raw :80 --output-http "http://user:pass@staging .com"
-```
-
-Note: This will overwrite any Authorization headers in the original request.
-
-#### Rewrite the target urls based on a mapping
-```
-# rewrite url to match the following
-gor --input-raw :8080 --output-http staging.com --output-http-rewrite-url /xml_test/interface.php:/api/service.do
-```
-
-
-## Stats 
-### ElasticSearch 
-For deep response analyze based on url, cookie, user-agent and etc. you can export response metadata to ElasticSearch. See [ELASTICSEARCH.md](ELASTICSEARCH.md) for more details.
-
-```
-gor --input-tcp :80 --output-http "http://staging.com" --output-http-elasticsearch "es_host:api_port/index_name"
-```
-
-## Additional help
-
-Feel free to ask question directly by email or by creating github issue.
-
-## Latest releases (including binaries)
-
-https://github.com/buger/gor/releases
-
-## Command line reference
-`gor -h` output:
-```
-  -cpuprofile="": write cpu profile to file
-  -memprofile="": write memory profile to this file
-  
-  -input-dummy=[]: Used for testing outputs. Emits 'Get /' request every 1s
-
-  -input-file=[]: Read requests from file: 
-    gor --input-file ./requests.gor --output-http staging.com
-
-  -input-raw=[]: Capture traffic from given port (use RAW sockets and require *sudo* access):
-    # Capture traffic from 8080 port
-    gor --input-raw :8080 --output-http staging.com
-
-  -input-tcp=[]: Used for internal communication between Gor instances. Example: 
-    # Receive requests from other Gor instances on 28020 port, and redirect output to staging
-    gor --input-tcp :28020 --output-http staging.com
-
-  -output-dummy=[]: Used for testing inputs. Just prints data coming from inputs.
-
-  -output-file=[]: Write incoming requests to file: 
-    gor --input-raw :80 --output-file ./requests.gor
-
-  -output-http=[]: Forwards incoming requests to given http address.
-    # Redirect all incoming requests to staging.com address 
-    gor --input-raw :80 --output-http http://staging.com
-
-  -output-http-elasticsearch="": Send request and response stats to ElasticSearch:
-    gor --input-raw :8080 --output-http staging.com --output-http-elasticsearch 'es_host:api_port/index_name'
-
-  -output-http-header=[]: Inject additional headers to http reqest:
-    gor --input-raw :8080 --output-http staging.com --output-http-header 'User-Agent: Gor'
-
-  -output-http-header-filter=[]: A regexp to match a specific header against. Requests with non-matching headers will be dropped:
-    gor --input-raw :8080 --output-http staging.com --output-http-header-filter api-version:^v1
-
-  -output-http-header-hash-filter=[]: Takes a fraction of requests, consistently taking or rejecting a request based on the FNV32-1A hash of a specific header. The fraction must have a denominator that is a power of two:
-    gor --input-raw :8080 --output-http staging.com --output-http-header-hash-filter user-id:1/4
-
-  -output-http-url-regexp=: A regexp to match requests against. Anything else will be dropped:
-    gor --input-raw :8080 --output-http staging.com --output-http-url-regexp ^www.
-    
-  -output-http-workers=-1: Number of http output workers desired. Use default -1 for dynamic worker scaling.  Gor will add http workers if its work queue starts getting too full and kill them .
-    
-  -output-http-stats=false: If set to `true` it gives out queuing stats for the HTTP output every 5 seconds in the form latest,mean,max,count,count/second.
-    
-  -output-tcp=[]: Used for internal communication between Gor instances. Example: 
-    # Listen for requests on 80 port and forward them to other Gor instance on 28020 port
-    gor --input-raw :80 --output-tcp replay.local:28020
-    
-  -output-tcp-stats=false: If set to `true` it gives out queuing stats for the TCP output every 5 seconds in the form latest,mean,max,count,count/second.
-    
-  -split-output=false: By default each output gets same traffic. If set to `true` it splits traffic equally among all outputs.
-
-  -output-http-rewrite-url=[]: Rewrites the url in the request based on a mapping
-    gor --input-raw :8080 --output-http staging.com --output-http-rewrite-url /xml_test/interface.php:/api/service.do
-```
-
-## Building from source
-
-1. Setup standard Go environment http://golang.org/doc/code.html and ensure that $GOPATH environment variable properly set.
-2. `go get github.com/buger/gor`.
-3. `cd $GOPATH/src/github.com/buger/gor`
-4. `go build` to get binary, or `go test` to run tests
-
-## Development
-Project contains Docker environment.
-
-1. Build container: `make dbuild`
-2. Run tests: `make dtest`
-3. Bash access to container: `make dbash`. Inside container you have python to run simple web server `python -m SimpleHTTPServer 8080` and `curl` to make http requests. 
-
-
-## Questions and support 
-
-All bug-reports and suggestions should go though Github Issues or our [Google Group](https://groups.google.com/forum/#!forum/gor-users). Or you can just send email to gor-users@googlegroups.com
-
-If you have some private questions you can send direct mail to leonsbox@gmail.com
-
-## FAQ
-
-### What OS are supported?
-For now only Linux based. *BSD (including MacOS is not supported yet, check https://github.com/buger/gor/issues/22 for details)
-
-### Why does the `--input-raw` requires sudo or root access?
-Listener works by sniffing traffic from a given port. It's accessible
-only by using sudo or root access.
-
-### I'm getting 'too many open files' error
-Typical linux shell has a small open files soft limit at 1024. You can easily raise that when you do this before starting your gor replay process:
-  
-  ulimit -n 64000
-
-More about ulimit: http://blog.thecodingmachine.com/content/solving-too-many-open-files-exception-red5-or-any-other-application
-
-### What do the stats commands do?
-Gor can report stats on the output-tcp and output-http request queues. Stats are reported to the console every 5 seconds in the form `latest,mean,max,count,count/second` by using the `-output-http-stats` and `-output-tcp-stats` options.
-
-Examples:
-
-```
-2014/04/23 21:17:50 output_tcp:latest,mean,max,count,count/second
-2014/04/23 21:17:50 output_tcp:0,0,0,0,0
-2014/04/23 21:17:55 output_tcp:1,1,2,68,13
-2014/04/23 21:18:00 output_tcp:1,1,2,92,18
-2014/04/23 21:18:05 output_tcp:1,1,2,119,23
-2014/04/23 21:18:10 output_tcp:1,0,1,95,19
-2014/04/23 21:18:15 output_tcp:1,1,2,92,18
-2014/04/23 21:18:20 output_tcp:1,1,2,108,21
-2014/04/23 21:18:25 output_tcp:1,1,2,117,23
-2014/04/23 21:18:30 output_tcp:1,1,2,113,22
-2014/04/23 21:18:35 output_tcp:21,20,21,132,26
-2014/04/23 21:18:40 output_tcp:100,99,100,99,19
-```
-
-```
-Version: 0.8
-2014/04/23 21:19:46 output_http:latest,mean,max,count,count/second
-2014/04/23 21:19:46 output_http:0,0,0,0,0
-2014/04/23 21:19:51 output_http:0,0,0,0,0
-2014/04/23 21:19:56 output_http:0,0,0,0,0
-2014/04/23 21:20:01 output_http:1,0,1,50,10
-2014/04/23 21:20:06 output_http:1,1,4,72,14
-2014/04/23 21:20:11 output_http:1,0,1,179,35
-2014/04/23 21:20:16 output_http:1,0,1,148,29
-2014/04/23 21:20:21 output_http:1,1,2,91,18
-2014/04/23 21:20:26 output_http:1,1,2,150,30
-2014/04/23 21:18:15 output_http:100,99,100,70,14
-2014/04/23 21:18:21 output_http:100,99,100,55,11
-2014/04/23 21:18:28 output_http:100,99,100,55,11
-2014/04/23 21:18:34 output_http:100,99,100,57,11
-2014/04/23 21:18:41 output_http:100,99,100,61,12
-2014/04/23 21:18:48 output_http:100,99,100,56,11
-2014/04/23 21:18:56 output_http:100,99,100,58,11
-2014/04/23 21:19:01 output_http:100,99,100,31,6
-2014/04/23 21:19:08 output_http:100,99,100,61,12
-2014/04/23 21:19:15 output_http:100,99,100,64,12
-2014/04/23 21:19:21 output_http:100,99,100,70,14
-2014/04/23 21:19:28 output_http:100,99,100,61,12
-2014/04/23 21:19:35 output_http:100,99,100,56,11
-```
-
-### How can I tell if I have bottlenecks?
-Key areas that sometimes experience bottlenecks are the output-tcp and output-http functions which have internal queues for requests. Each queue has an upper limit of 100. Enable stats reporting to see if any queues are experiencing bottleneck behavior.
- 
-#### output-http bottlenecks
-When running a Gor replay the output-http feature may bottleneck if:
-
-  * the replay has inadequate bandwidth. If the replay is receiving or sending more messages than its network adapter can handle the output-http-stats  may report that the output-http queue is filling up. See if there is a way to upgrade the replay's bandwidth.
-  * with `--output-http-workers` set to anything other than `-1` the `-output-http` target is unable to respond to messages in a timely manner. The http output workers which take messages off the output-http queue, process the request, and ensure that the request did not result in an error may not be able to keep up with the number of incoming requests. If the replay is not using dynamic worker scaling (`--output-http-workers=-1`)  The optimal number of output-http-workers can be determined with the formula `output-workers = (Average number of requests per second)/(Average target response time per second)`.
-
-#### output-tcp bottlenecks
-When using the Gor listener the output-tcp feature may bottleneck if:
-
-  * the replay is unable to accept and process more requests than the listener is able generate. Prior to troubleshooting the output-tcp bottleneck, ensure that the replay target is not experiencing any bottlenecks. 
-  * the replay target has inadequate bandwidth to handle all its incoming requests.  If a replay target's incoming bandwidth is maxed out the output-tcp-stats may report that the output-tcp queue is filling up. See if there is a way to upgrade the replay's bandwidth.
-
-### The CPU average across my load-balanced targets is higher than the source
-If you are replaying traffic from multiple listeners to a load-balanced target and you use sticky sessions, you may observe that the target servers have a higher CPU load than the listener servers. This may be because the sticky session cookie of the original load balancer is not honored by the target load balancer thus resulting in requests that would normally hit the same target server hitting different servers on the backend thus reducing some caching benefits gained via the load balancing.  Try running just one listener against one replay target and see if the CPU utilization comparison is more accurate.
- 
-### How does dynamic http worker scaling work?
-By using the Gor setting `--output-http-workers=-1` Gor will create more http output workers when the http output queue length is greater than 10.  The number of workers created (N) is equal to the queue length at the time which it is checked and found to have a length greater than 10. The queue length is checked every time a message is written to the http output queue.  No more workers will be spawned until that request to spawn N workers is satisfied.  If a dynamic worker cannot process a message at that time, it will sleep for 100 milliseconds. If a dynamic worker cannot process a message for 2 seconds it dies.  
-
-## Tuning
-
-To achieve the top most performance you should tune the source server system limits:
-
-    net.ipv4.tcp_max_tw_buckets = 65536
-    net.ipv4.tcp_tw_recycle = 1
-    net.ipv4.tcp_tw_reuse = 0
-    net.ipv4.tcp_max_syn_backlog = 131072
-    net.ipv4.tcp_syn_retries = 3
-    net.ipv4.tcp_synack_retries = 3
-    net.ipv4.tcp_retries1 = 3
-    net.ipv4.tcp_retries2 = 8
-    net.ipv4.tcp_rmem = 16384 174760 349520
-    net.ipv4.tcp_wmem = 16384 131072 262144
-    net.ipv4.tcp_mem = 262144 524288 1048576
-    net.ipv4.tcp_max_orphans = 65536
-    net.ipv4.tcp_fin_timeout = 10
-    net.ipv4.tcp_low_latency = 1
-    net.ipv4.tcp_syncookies = 0
-
-
-## Contributing
-
-1. Fork it
-2. Create your feature branch (git checkout -b my-new-feature)
-3. Commit your changes (git commit -am 'Added some feature')
-4. Push to the branch (git push origin my-new-feature)
-5. Create new Pull Request
-
-## Companies using Gor
-
-* [Granify](http://granify.com)
-* [GOV.UK](https://www.gov.uk) ([Government Digital Service](http://digital.cabinetoffice.gov.uk/))
-* [theguardian.com](http://theguardian.com)
-* [TomTom](http://www.tomtom.com/)
-* To add your company drop me a line to github.com/buger or leonsbox@gmail.com
+[![GitHub release](https://img.shields.io/github/release/buger/gor.svg?maxAge=3600)](https://github.com/buger/goreplay/releases) [![codebeat](https://codebeat.co/badges/6427d589-a78e-416c-a546-d299b4089893)](https://codebeat.co/projects/github-com-buger-gor) [![Go Report Card](https://goreportcard.com/badge/github.com/buger/gor)](https://goreportcard.com/report/github.com/buger/gor) [![Join the chat at https://gitter.im/buger/gor](https://badges.gitter.im/buger/gor.svg)](https://gitter.im/buger/gor?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Reviewed by Hound](https://img.shields.io/badge/Reviewed_by-Hound-8E64B0.svg)](https://houndci.com)
+
+![Go Replay](http://i.imgur.com/ZG2ki5n.png)
+
+## https://goreplay.org/
+
+GoReplay is an open-source network monitoring tool which can record your live traffic, and use it for shadowing, load testing, monitoring and detailed analysis.
+
+## About
+
+As your application grows, the effort required to test it also grows exponentially. GoReplay offers you the simple idea of reusing your existing traffic for testing, which makes it incredibly powerful. Our state of art technique allows you to analyze and record your application traffic without affecting it. This eliminates the risks that come with putting a third party component in the critical path. 
+
+GoReplay increases your confidence in code deployments, configuration and infrastructure changes.
+
+
+GoReplay offers unique approach for shadowing. Instead of being a proxy, GoReplay in background listen for traffic on your network interface, requiring no changes in your production infrastructure, rather then running GoReplay daemon on the same machine as your service.
+
+![Diagram](https://i.imgur.com/IN2xfDm.png)
+
+Check [latest documentation](http://github.com/buger/goreplay/wiki).
+
+## Installation
+Download latest binary from https://github.com/buger/goreplay/releases or [compile by yourself](https://github.com/buger/goreplay/wiki/Compilation).
+
+## Getting started
+
+The most basic setup will be `sudo ./gor --input-raw :8000 --output-stdout` which acts like tcpdump.
+If you already have test environment you can start replaying: `sudo ./gor --input-raw :8000 --output-http http://staging.env`.
+
+See the our [documentation](https://github.com/buger/goreplay/wiki/) and [Getting started](https://github.com/buger/goreplay/wiki/Getting-Started) page for more info. 
+
+## Newsletter
+Subscribe to our [newsletter](https://www.getdrip.com/forms/89690474/submissions/new) to stay informed about the latest features and changes to Gor project.
+
+
+## Want to Upgrade?
+
+We have created a [GoReplay PRO](https://goreplay.org/pro.html) extension which provides additional features such as support for binary protocols like Thrift or ProtocolBuffers, saving and replaying from cloud storage, TCP sessions replication, etc. The PRO version also includes a commercial-friendly license, dedicated support, and it also allows you to support high-quality open source development. 
+
+
+## Problems?
+If you have a problem, please review the [FAQ](https://github.com/buger/goreplay/wiki/FAQ) and [Troubleshooting](https://github.com/buger/goreplay/wiki/Troubleshooting) wiki pages. Searching the [issues](https://github.com/buger/goreplay/issues) for your problem is also a good idea.
+
+All bug-reports and suggestions should go through Github Issues or our [Google Group](https://groups.google.com/forum/#!forum/gor-users) (you can just send email to gor-users@googlegroups.com).
+If you have a private question feel free to send email to support@gortool.com.
+
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (git checkout -b my-new-feature)
+3. Commit your changes (git commit -am 'Added some feature')
+4. Push to the branch (git push origin my-new-feature)
+5. Create new Pull Request
+
+## Companies using Gor
+
+* [GOV.UK](https://www.gov.uk) - UK Government Digital Service
+* [theguardian.com](http://theguardian.com) - Most popular online newspaper in the UK
+* [TomTom](http://www.tomtom.com/) - Global leader in navigation, traffic and map products, GPS Sport Watches and fleet management solutions.
+* [3SCALE](http://www.3scale.net/) - API infrastructure to manage your APIs for internal or external users
+* [Optionlab](http://www.opinionlab.com) - Optimize customer experience and drive engagement across multiple channels
+* [TubeMogul](http://tubemogul.com) - Software for Brand Advertising
+* [Videology](http://www.videologygroup.com/) - Video advertising platform
+* [ForeksMobile](http://foreksmobile.com/) -  One of the leading financial application development company in Turkey
+* [Granify](http://granify.com) - AI backed SaaS solution that enables online retailers to maximise their sales
+* And many more!
+
+If you are using Gor, we are happy to add you to the list and share your story, just write to: hello@goreplay.org
+
+## Author
+
+Leonid Bugaev, [@buger](https://twitter.com/buger), https://leonsbox.com

byteutils/byteutils.go

@@ -0,0 +1,52 @@
+// Package byteutils provides helpers for working with byte slices
+package byteutils
+
+import (
+	"unsafe"
+)
+
+// Cut elements from slice for a given range
+func Cut(a []byte, from, to int) []byte {
+	copy(a[from:], a[to:])
+	a = a[:len(a)-to+from]
+
+	return a
+}
+
+// Insert new slice at specified position
+func Insert(a []byte, i int, b []byte) []byte {
+	a = append(a, make([]byte, len(b))...)
+	copy(a[i+len(b):], a[i:])
+	copy(a[i:i+len(b)], b)
+
+	return a
+}
+
+// Replace function unlike bytes.Replace allows you to specify range
+func Replace(a []byte, from, to int, new []byte) []byte {
+	lenDiff := len(new) - (to - from)
+
+	if lenDiff > 0 {
+		// Extend if new segment bigger
+		a = append(a, make([]byte, lenDiff)...)
+		copy(a[to+lenDiff:], a[to:])
+		copy(a[from:from+len(new)], new)
+
+		return a
+	}
+
+	if lenDiff < 0 {
+		copy(a[from:], new)
+		copy(a[from+len(new):], a[to:])
+		return a[:len(a)+lenDiff]
+	}
+
+	// same size
+	copy(a[from:], new)
+	return a
+}
+
+// SliceToString preferred for large body payload (zero allocation and faster)
+func SliceToString(buf []byte) string {
+	return *(*string)(unsafe.Pointer(&buf))
+}

byteutils/byteutils_test.go

@@ -0,0 +1,41 @@
+package byteutils
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestCut(t *testing.T) {
+	if !bytes.Equal(Cut([]byte("123456"), 2, 4), []byte("1256")) {
+		t.Error("Should properly cut")
+	}
+}
+
+func TestInsert(t *testing.T) {
+	if !bytes.Equal(Insert([]byte("123456"), 2, []byte("abcd")), []byte("12abcd3456")) {
+		t.Error("Should insert into middle of slice")
+	}
+}
+
+func TestReplace(t *testing.T) {
+	if !bytes.Equal(Replace([]byte("123456"), 2, 4, []byte("ab")), []byte("12ab56")) {
+		t.Error("Should replace when same length")
+	}
+
+	if !bytes.Equal(Replace([]byte("123456"), 2, 4, []byte("abcd")), []byte("12abcd56")) {
+		t.Error("Should replace when replacement length bigger")
+	}
+
+	if !bytes.Equal(Replace([]byte("123456"), 2, 5, []byte("ab")), []byte("12ab6")) {
+		t.Error("Should replace when replacement length bigger")
+	}
+}
+
+func BenchmarkStringtoSlice(b *testing.B) {
+	var s string
+	var buf [1 << 20]byte
+	for i := 0; i < b.N; i++ {
+		s = SliceToString(buf[:])
+	}
+	_ = s // avoid gc to optimize away the loop body
+}

capture/capture.go

@@ -0,0 +1,546 @@
+package capture
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"runtime"
+	"sync"
+	"time"
+
+	"github.com/buger/goreplay/size"
+	"github.com/buger/goreplay/tcp"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+	"github.com/google/gopacket/pcap"
+	"github.com/pbnjay/memory"
+	"golang.org/x/sys/unix"
+)
+
+// PacketHandler is a function that is used to handle packets
+type PacketHandler func(*tcp.Packet)
+
+// PcapOptions options that can be set on a pcap capture handle,
+// these options take effect on inactive pcap handles
+type PcapOptions struct {
+	BufferTimeout time.Duration `json:"input-raw-buffer-timeout"`
+	TimestampType string        `json:"input-raw-timestamp-type"`
+	BPFFilter     string        `json:"input-raw-bpf-filter"`
+	BufferSize    size.Size     `json:"input-raw-buffer-size"`
+	Promiscuous   bool          `json:"input-raw-promisc"`
+	Monitor       bool          `json:"input-raw-monitor"`
+	Snaplen       bool          `json:"input-raw-override-snaplen"`
+}
+
+// Listener handle traffic capture, this is its representation.
+type Listener struct {
+	sync.Mutex
+	Transport  string       // transport layer default to tcp
+	Activate   func() error // function is used to activate the engine. it must be called before reading packets
+	Handles    map[string]gopacket.ZeroCopyPacketDataSource
+	Interfaces []net.Interface
+	loopIndex  int
+	Reading    chan bool // this channel is closed when the listener has started reading packets
+	PcapOptions
+	Engine        EngineType
+	port          uint16 // src or/and dst port
+	trackResponse bool
+
+	host          string // pcap file name or interface (name, hardware addr, index or ip address)
+	maxAllowedMem int
+
+	closeDone chan struct{}
+	quit      chan struct{}
+}
+
+// EngineType ...
+type EngineType uint8
+
+// Available engines for intercepting traffic
+const (
+	EnginePcap EngineType = 1 << iota
+	EnginePcapFile
+	EngineRawSocket
+)
+
+// Set is here so that EngineType can implement flag.Var
+func (eng *EngineType) Set(v string) error {
+	switch v {
+	case "", "libpcap":
+		*eng = EnginePcap
+	case "pcap_file":
+		*eng = EnginePcapFile
+	case "raw_socket", "af_packet":
+		*eng = EngineRawSocket
+	default:
+		return fmt.Errorf("invalid engine %s", v)
+	}
+	return nil
+}
+
+func (eng *EngineType) String() (e string) {
+	switch *eng {
+	case EnginePcapFile:
+		e = "pcap_file"
+	case EnginePcap:
+		e = "libpcap"
+	case EngineRawSocket:
+		e = "raw_socket"
+	default:
+		e = ""
+	}
+	return e
+}
+
+// NewListener creates and initialize a new Listener. if transport or/and engine are invalid/unsupported
+// is "tcp" and "pcap", are assumed. l.Engine and l.Transport can help to get the values used.
+// if there is an error it will be associated with getting network interfaces
+func NewListener(host string, port uint16, transport string, engine EngineType, trackResponse bool, maxAllowedMem int) (l *Listener, err error) {
+	l = &Listener{}
+
+	l.host = host
+	l.port = port
+	l.Transport = "tcp"
+	if transport != "" {
+		l.Transport = transport
+	}
+	l.Handles = make(map[string]gopacket.ZeroCopyPacketDataSource)
+	l.trackResponse = trackResponse
+	l.closeDone = make(chan struct{})
+	l.quit = make(chan struct{})
+	l.Reading = make(chan bool)
+	l.maxAllowedMem = maxAllowedMem
+	switch engine {
+	default:
+		l.Engine = EnginePcap
+		l.Activate = l.activatePcap
+	case EngineRawSocket:
+		l.Engine = EngineRawSocket
+		l.Activate = l.activateRawSocket
+	case EnginePcapFile:
+		l.Engine = EnginePcapFile
+		l.Activate = l.activatePcapFile
+		return
+	}
+	err = l.setInterfaces()
+	if err != nil {
+		return nil, err
+	}
+	return
+}
+
+// SetPcapOptions set pcap options for all yet to be actived pcap handles
+// setting this on already activated handles will not have any effect
+func (l *Listener) SetPcapOptions(opts PcapOptions) {
+	l.PcapOptions = opts
+}
+
+// Listen listens for packets from the handles, and call handler on every packet received
+// until the context done signal is sent or there is unrecoverable error on all handles.
+// this function must be called after activating pcap handles
+func (l *Listener) Listen(ctx context.Context, handler PacketHandler) (err error) {
+	l.read(handler)
+	done := ctx.Done()
+	select {
+	case <-done:
+		close(l.quit) // signal close on all handles
+		<-l.closeDone // wait all handles to be closed
+		err = ctx.Err()
+	case <-l.closeDone: // all handles closed voluntarily
+	}
+	return
+}
+
+// ListenBackground is like listen but can run concurrently and signal error through channel
+func (l *Listener) ListenBackground(ctx context.Context, handler PacketHandler) chan error {
+	err := make(chan error, 1)
+	go func() {
+		defer close(err)
+		if e := l.Listen(ctx, handler); err != nil {
+			err <- e
+		}
+	}()
+	return err
+}
+
+// Filter returns automatic filter applied by goreplay
+// to a pcap handle of a specific interface
+func (l *Listener) Filter(ifi net.Interface) (filter string) {
+	// https://www.tcpdump.org/manpages/pcap-filter.7.html
+
+	port := fmt.Sprintf("portrange 0-%d", 1<<16-1)
+	if l.port != 0 {
+		port = fmt.Sprintf("port %d", l.port)
+	}
+	filter = fmt.Sprintf("%s dst %s", l.Transport, port)
+	if l.trackResponse {
+		filter = fmt.Sprintf("%s %s", l.Transport, port)
+	}
+
+	if listenAll(l.host) || isDevice(l.host, ifi) {
+		return "(" + filter + ")"
+	}
+	filter = fmt.Sprintf("(host %s and (%s))", l.host, filter)
+
+	log.Println("BPF filter: " + filter)
+	return
+}
+
+// PcapDumpHandler returns a handler to write packet data in PCAP
+// format, See http://wiki.wireshark.org/Development/LibpcapFileFormathandler.
+// if link layer is invalid Ethernet is assumed
+// func PcapDumpHandler(file *os.File, link layers.LinkType) (handler func(packet *tcp.Packet) error, err error) {
+// 	if link.String() == "" {
+// 		link = layers.LinkTypeEthernet
+// 	}
+// 	w := NewWriterNanos(file)
+// 	err = w.WriteFileHeader(64<<10, link)
+// 	if err != nil {
+// 		return nil, err
+// 	}
+// 	return func(packet *tcp.Packet) error {
+// 		return w.WritePacket(*packet.Info, packet.Data)
+// 	}, nil
+// }
+
+// PcapHandle returns new pcap Handle from dev on success.
+// this function should be called after setting all necessary options for this listener
+func (l *Listener) PcapHandle(ifi net.Interface) (handle *pcap.Handle, err error) {
+	var inactive *pcap.InactiveHandle
+	inactive, err = pcap.NewInactiveHandle(ifi.Name)
+	if err != nil {
+		return nil, fmt.Errorf("inactive handle error: %q, interface: %q", err, ifi.Name)
+	}
+	defer inactive.CleanUp()
+	if l.TimestampType != "" {
+		var ts pcap.TimestampSource
+		ts, err = pcap.TimestampSourceFromString(l.TimestampType)
+		err = inactive.SetTimestampSource(ts)
+		if err != nil {
+			return nil, fmt.Errorf("%q: supported timestamps: %q, interface: %q", err, inactive.SupportedTimestamps(), ifi.Name)
+		}
+	}
+	if l.Promiscuous {
+		if err = inactive.SetPromisc(l.Promiscuous); err != nil {
+			return nil, fmt.Errorf("promiscuous mode error: %q, interface: %q", err, ifi.Name)
+		}
+	}
+	if l.Monitor {
+		if err = inactive.SetRFMon(l.Monitor); err != nil && !errors.Is(err, pcap.CannotSetRFMon) {
+			return nil, fmt.Errorf("monitor mode error: %q, interface: %q", err, ifi.Name)
+		}
+	}
+	var snap int
+	if l.Snaplen {
+		snap = 64<<10 + 200
+	} else if ifi.MTU > 0 {
+		snap = ifi.MTU + 200
+	}
+	err = inactive.SetSnapLen(snap)
+	if err != nil {
+		return nil, fmt.Errorf("snapshot length error: %q, interface: %q", err, ifi.Name)
+	}
+	if l.BufferSize > 0 {
+		err = inactive.SetBufferSize(int(l.BufferSize))
+		if err != nil {
+			return nil, fmt.Errorf("handle buffer size error: %q, interface: %q", err, ifi.Name)
+		}
+	}
+	if l.BufferTimeout == 0 {
+		l.BufferTimeout = pcap.BlockForever
+	}
+	err = inactive.SetTimeout(l.BufferTimeout)
+	if err != nil {
+		return nil, fmt.Errorf("handle buffer timeout error: %q, interface: %q", err, ifi.Name)
+	}
+	handle, err = inactive.Activate()
+	if err != nil {
+		return nil, fmt.Errorf("PCAP Activate device error: %q, interface: %q", err, ifi.Name)
+	}
+	if l.BPFFilter != "" {
+		if l.BPFFilter[0] != '(' || l.BPFFilter[len(l.BPFFilter)-1] != ')' {
+			l.BPFFilter = "(" + l.BPFFilter + ")"
+		}
+	} else {
+		l.BPFFilter = l.Filter(ifi)
+	}
+	fmt.Println("Interface:", ifi.Name, ". BPF Filter:", l.BPFFilter)
+	err = handle.SetBPFFilter(l.BPFFilter)
+	if err != nil {
+		handle.Close()
+		return nil, fmt.Errorf("BPF filter error: %q%s, interface: %q", err, l.BPFFilter, ifi.Name)
+	}
+	return
+}
+
+// SocketHandle returns new unix ethernet handle associated with this listener settings
+func (l *Listener) SocketHandle(ifi net.Interface) (handle Socket, err error) {
+	handle, err = NewSocket(ifi)
+	if err != nil {
+		return nil, fmt.Errorf("sock raw error: %q, interface: %q", err, ifi.Name)
+	}
+	if err = handle.SetPromiscuous(l.Promiscuous || l.Monitor); err != nil {
+		return nil, fmt.Errorf("promiscuous mode error: %q, interface: %q", err, ifi.Name)
+	}
+	if l.BPFFilter != "" {
+		if l.BPFFilter[0] != '(' || l.BPFFilter[len(l.BPFFilter)-1] != ')' {
+			l.BPFFilter = "(" + l.BPFFilter + ")"
+		}
+	} else {
+		l.BPFFilter = l.Filter(ifi)
+	}
+	fmt.Println("BPF Filter: ", l.BPFFilter)
+	if err = handle.SetBPFFilter(l.BPFFilter); err != nil {
+		handle.Close()
+		return nil, fmt.Errorf("BPF filter error: %q%s, interface: %q", err, l.BPFFilter, ifi.Name)
+	}
+	handle.SetLoopbackIndex(int32(l.loopIndex))
+	return
+}
+
+func (l *Listener) read(handler PacketHandler) {
+	l.Lock()
+	defer l.Unlock()
+	for key, handle := range l.Handles {
+		go func(key string, hndl gopacket.ZeroCopyPacketDataSource) {
+			defer l.closeHandles(key)
+			linkSize := 14
+			linkType := int(layers.LinkTypeEthernet)
+			if _, ok := hndl.(*pcap.Handle); ok {
+				linkType = int(hndl.(*pcap.Handle).LinkType())
+				linkSize, ok = pcapLinkTypeLength(linkType)
+				if !ok {
+					if os.Getenv("GORDEBUG") != "0" {
+						log.Printf("can not identify link type of an interface '%s'\n", key)
+					}
+					return // can't find the linktype size
+				}
+			}
+
+			ticker := time.NewTicker(time.Second)
+
+			for {
+				select {
+				case <-l.quit:
+					return
+				case <-ticker.C:
+					if l.maxAllowedMem > 0 {
+						usedMemory, _ := memUsage()
+						if int(usedMemory) > l.maxAllowedMem {
+							log.Printf("[WARNING] Using more memory (%vmb) than allowed (%vmb). Enabling throttling for 1 second\n", bToMb(usedMemory), bToMb(uint64(l.maxAllowedMem)))
+							time.Sleep(time.Second)
+						}
+					}
+				default:
+					data, ci, err := hndl.ZeroCopyReadPacketData()
+					if err == nil {
+						pckt, err := tcp.ParsePacket(data, linkType, linkSize, &ci)
+						if err == nil {
+							handler(pckt)
+						}
+						continue
+					}
+					if enext, ok := err.(pcap.NextError); ok && enext == pcap.NextErrorTimeoutExpired {
+						continue
+					}
+					if eno, ok := err.(unix.Errno); ok && eno.Temporary() {
+						continue
+					}
+					if enet, ok := err.(*net.OpError); ok && (enet.Temporary() || enet.Timeout()) {
+						continue
+					}
+					if err == io.EOF || err == io.ErrClosedPipe {
+						log.Printf("stopped reading from %s interface with error %s\n", key, err)
+						return
+					}
+
+					log.Printf("stopped reading from %s interface with error %s\n", key, err)
+					return
+				}
+			}
+		}(key, handle)
+	}
+	close(l.Reading)
+}
+
+func (l *Listener) closeHandles(key string) {
+	l.Lock()
+	defer l.Unlock()
+	if handle, ok := l.Handles[key]; ok {
+		if _, ok = handle.(Socket); ok {
+			handle.(Socket).Close()
+		} else {
+			handle.(*pcap.Handle).Close()
+		}
+		delete(l.Handles, key)
+		if len(l.Handles) == 0 {
+			close(l.closeDone)
+		}
+	}
+}
+
+func (l *Listener) activatePcap() error {
+	var e error
+	var msg string
+	for _, ifi := range l.Interfaces {
+		var handle *pcap.Handle
+		handle, e = l.PcapHandle(ifi)
+		if e != nil {
+			msg += ("\n" + e.Error())
+			continue
+		}
+		l.Handles[ifi.Name] = handle
+	}
+	if len(l.Handles) == 0 {
+		return fmt.Errorf("pcap handles error:%s", msg)
+	}
+	return nil
+}
+
+func (l *Listener) activateRawSocket() error {
+	if runtime.GOOS != "linux" {
+		return fmt.Errorf("sock_raw is not stabilized on OS other than linux")
+	}
+	var msg string
+	var e error
+	for _, ifi := range l.Interfaces {
+		var handle Socket
+		handle, e = l.SocketHandle(ifi)
+		if e != nil {
+			msg += ("\n" + e.Error())
+			continue
+		}
+		l.Handles[ifi.Name] = handle
+	}
+	if len(l.Handles) == 0 {
+		return fmt.Errorf("raw socket handles error:%s", msg)
+	}
+	return nil
+}
+
+func (l *Listener) activatePcapFile() (err error) {
+	var handle *pcap.Handle
+	var e error
+	if handle, e = pcap.OpenOffline(l.host); e != nil {
+		return fmt.Errorf("open pcap file error: %q", e)
+	}
+	if l.BPFFilter != "" {
+		if l.BPFFilter[0] != '(' || l.BPFFilter[len(l.BPFFilter)-1] != ')' {
+			l.BPFFilter = "(" + l.BPFFilter + ")"
+		}
+	} else {
+		addr := l.host
+		l.host = ""
+		l.BPFFilter = l.Filter(net.Interface{})
+		l.host = addr
+	}
+	if e = handle.SetBPFFilter(l.BPFFilter); e != nil {
+		handle.Close()
+		return fmt.Errorf("BPF filter error: %q, filter: %s", e, l.BPFFilter)
+	}
+	l.Handles["pcap_file"] = handle
+	return
+}
+
+func (l *Listener) setInterfaces() (err error) {
+	var ifis []net.Interface
+	ifis, err = net.Interfaces()
+	if err != nil {
+		return
+	}
+	for i := range ifis {
+		if ifis[i].Flags&net.FlagLoopback != 0 {
+			l.loopIndex = ifis[i].Index
+		}
+		if ifis[i].Flags&net.FlagUp == 0 {
+			continue
+		}
+		if isDevice(l.host, ifis[i]) {
+			l.Interfaces = []net.Interface{ifis[i]}
+			return
+		}
+		addrs, e := ifis[i].Addrs()
+		if e != nil {
+			// don't give up on a failure from a single interface
+			continue
+		}
+		for _, addr := range addrs {
+			if cutMask(addr) == l.host {
+				l.Interfaces = []net.Interface{ifis[i]}
+				return
+			}
+		}
+	}
+	l.Interfaces = ifis
+	return
+}
+
+func cutMask(addr net.Addr) string {
+	mask := addr.String()
+	for i, v := range mask {
+		if v == '/' {
+			return mask[:i]
+		}
+	}
+	return mask
+}
+
+func isDevice(addr string, ifi net.Interface) bool {
+	return addr == ifi.Name || addr == fmt.Sprintf("%d", ifi.Index) || (addr != "" && addr == ifi.HardwareAddr.String())
+}
+
+func listenAll(addr string) bool {
+	switch addr {
+	case "", "0.0.0.0", "[::]", "::":
+		return true
+	}
+	return false
+}
+
+func pcapLinkTypeLength(lType int) (int, bool) {
+	switch layers.LinkType(lType) {
+	case layers.LinkTypeEthernet:
+		return 14, true
+	case layers.LinkTypeNull, layers.LinkTypeLoop:
+		return 4, true
+	case layers.LinkTypeRaw, 12, 14:
+		return 0, true
+	case layers.LinkTypeIPv4, layers.LinkTypeIPv6:
+		// (TODO:) look out for IP encapsulation?
+		return 0, true
+	case layers.LinkTypeLinuxSLL:
+		return 16, true
+	case layers.LinkTypeFDDI:
+		return 13, true
+	case 226 /*DLT_IPNET*/ :
+		// https://www.tcpdump.org/linktypes/LINKTYPE_IPNET.html
+		return 24, true
+	default:
+		return 0, false
+	}
+}
+
+func memUsage() (uint64, uint64) {
+	var m runtime.MemStats
+	runtime.ReadMemStats(&m)
+	// fmt.Printf("Current memory usage: ")
+	// // For info on each, see: https://golang.org/pkg/runtime/#MemStats
+	// fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))
+	// fmt.Printf("\tTotalAlloc = %v MiB", bToMb(m.TotalAlloc))
+	// fmt.Printf("\tSys = %v MiB", bToMb(m.Sys))
+	// fmt.Printf("\tNumGC = %v\n", m.NumGC)
+
+	// fmt.Printf("Total available memory %v MiB\n", bToMb(memory.TotalMemory()))
+	// fmt.Printf("Currently using %.2f %% of memory\n", 100*float64(m.Alloc+m.Sys)/float64(memory.TotalMemory()))
+
+	return m.Alloc + m.Sys, memory.TotalMemory()
+}
+
+func bToMb(b uint64) uint64 {
+	return b / 1024 / 1024
+}

capture/capture_test.go

@@ -0,0 +1,313 @@
+package capture
+
+import (
+	"context"
+	"encoding/binary"
+	"io/ioutil"
+	"net"
+	"os"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/google/gopacket/layers"
+	"github.com/google/gopacket/pcap"
+)
+
+var LoopBack = func() net.Interface {
+	ifis, _ := net.Interfaces()
+	for _, v := range ifis {
+		if v.Flags&net.FlagLoopback != 0 {
+			return v
+		}
+	}
+	return ifis[0]
+}()
+
+func TestSetInterfaces(t *testing.T) {
+	l := &Listener{}
+	l.host = "127.0.0.1"
+	l.setInterfaces()
+	if len(l.Interfaces) != 1 {
+		t.Error("expected a single interface")
+	}
+	l.host = LoopBack.HardwareAddr.String()
+	l.setInterfaces()
+	if l.Interfaces[0].Name != LoopBack.Name && len(l.Interfaces) != 1 {
+		t.Error("interface should be loop back interface")
+	}
+	l.host = ""
+	l.setInterfaces()
+	if len(l.Interfaces) < 1 {
+		t.Error("should get all interfaces")
+	}
+}
+
+func TestBPFFilter(t *testing.T) {
+	l := &Listener{}
+	l.host = "127.0.0.1"
+	l.Transport = "tcp"
+	l.setInterfaces()
+	filter := l.Filter(l.Interfaces[0])
+	if filter != "(tcp dst portrange 0-65535 and host 127.0.0.1)" {
+		t.Error("wrong filter", filter)
+	}
+	l.port = 8000
+	l.trackResponse = true
+	filter = l.Filter(l.Interfaces[0])
+	if filter != "(tcp port 8000 and host 127.0.0.1)" {
+		t.Error("wrong filter")
+	}
+}
+
+func TestPcapDump(t *testing.T) {
+	f, err := ioutil.TempFile("", "pcap_file")
+	if err != nil {
+		t.Error(err)
+	}
+	h, _ := PcapDumpHandler(f, layers.LinkTypeLoop)
+	packets := Packets(1, 5, 5, 4)
+	for i := 0; i < len(packets); i++ {
+		if i == 1 {
+			// change dst port
+			binary.BigEndian.PutUint16(packets[i].TransLayer[2:], 8001)
+		}
+		if i == 4 {
+			packets[i].Info.CaptureLength = 40
+		}
+		h(packets[i])
+	}
+	name := f.Name()
+	f.Close()
+	testPcapDumpEngine(name, t)
+}
+
+func testPcapDumpEngine(f string, t *testing.T) {
+	defer os.Remove(f)
+	l, err := NewListener(f, 8000, "", EnginePcapFile, true)
+	err = l.Activate()
+	if err != nil {
+		t.Errorf("expected error to be nil, got %q", err)
+		return
+	}
+	pckts := 0
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	err = l.Listen(ctx, func(packet *Packet) {
+		if packet.Info.CaptureLength != 57 {
+			t.Errorf("expected packet length to be %d, got %d", 57, packet.Info.CaptureLength)
+		}
+		pckts++
+	})
+
+	if err != nil {
+		t.Errorf("expected error to be nil, got %q", err)
+	}
+	if pckts != 3 {
+		t.Errorf("expected %d packets, got %d packets", 3, pckts)
+	}
+}
+
+func TestPcapHandler(t *testing.T) {
+	l, err := NewListener(LoopBack.Name, 8000, "", EnginePcap, true)
+	if err != nil {
+		t.Errorf("expected error to be nil, got %v", err)
+		return
+	}
+	err = l.Activate()
+	if err != nil {
+		t.Errorf("expected error to be nil, got %v", err)
+		return
+	}
+	defer l.Handles[LoopBack.Name].(*pcap.Handle).Close()
+	if err != nil {
+		t.Errorf("expected error to be nil, got %v", err)
+		return
+	}
+	for i := 0; i < 5; i++ {
+		_, _ = net.Dial("tcp", "127.0.0.1:8000")
+	}
+	sts, _ := l.Handles[LoopBack.Name].(*pcap.Handle).Stats()
+	if sts.PacketsReceived < 5 {
+		t.Errorf("expected >=5 packets got %d", sts.PacketsReceived)
+	}
+}
+
+// func TestSocketHandler(t *testing.T) {
+// 	l, err := NewListener(LoopBack.Name, 8000, "", EngineRawSocket, true)
+// 	err = l.Activate()
+// 	if err != nil {
+// 		return
+// 	}
+// 	defer l.Handles[LoopBack.Name].(*SockRaw).Close()
+// 	if err != nil {
+// 		t.Errorf("expected error to be nil, got %v", err)
+// 		return
+// 	}
+// 	for i := 0; i < 5; i++ {
+// 		_, _ = net.Dial("tcp", "127.0.0.1:8000")
+// 	}
+// 	sts, _ := l.Handles[LoopBack.Name].(*SockRaw).Stats()
+// 	if sts.Packets < 5 {
+// 		t.Errorf("expected >=5 packets got %d", sts.Packets)
+// 	}
+// }
+
+func BenchmarkPcapDump(b *testing.B) {
+	f, err := ioutil.TempFile("", "pcap_file")
+	if err != nil {
+		b.Error(err)
+		return
+	}
+	now := time.Now()
+	defer os.Remove(f.Name())
+	h, _ := PcapDumpHandler(f, layers.LinkTypeLoop)
+	packets := Packets(1, b.N, 5, 4)
+	for i := 0; i < len(packets); i++ {
+		h(packets[i])
+	}
+	f.Close()
+	b.Logf("%d packets in %s", b.N, time.Since(now))
+}
+
+func BenchmarkPcapFile(b *testing.B) {
+	f, err := ioutil.TempFile("", "pcap_file")
+	if err != nil {
+		b.Error(err)
+		return
+	}
+	defer os.Remove(f.Name())
+	h, _ := PcapDumpHandler(f, layers.LinkTypeLoop)
+	packets := Packets(1, b.N, 5, 4)
+	for i := 0; i < len(packets); i++ {
+		h(packets[i])
+	}
+	name := f.Name()
+	f.Close()
+	b.ResetTimer()
+	var l *Listener
+	l, err = NewListener(name, 8000, "", EnginePcapFile, true)
+	if err != nil {
+		b.Error(err)
+		return
+	}
+	err = l.Activate()
+	if err != nil {
+		b.Error(err)
+		return
+	}
+	now := time.Now()
+	pckts := 0
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	if err = l.Listen(ctx, func(packet *Packet) {
+		if packet.Info.CaptureLength != 49 {
+			b.Errorf("expected packet length to be %d, got %d", 49, packet.Info.CaptureLength)
+		}
+		pckts++
+	}); err != nil {
+		b.Error(err)
+	}
+	b.Logf("%d/%d packets in %s", pckts, b.N, time.Since(now))
+}
+
+// used to benchmark sock engine
+var buf [1024]byte
+
+func init() {
+	for i := 0; i < len(buf); i++ {
+		buf[i] = 0xff
+	}
+}
+
+func handler(n, counter *int32) PacketHandler {
+	return func(p *Packet) {
+		nn := int32(len(p.Data))
+		atomic.AddInt32(n, nn)
+		atomic.AddInt32(counter, 1)
+	}
+}
+
+func BenchmarkPcap(b *testing.B) {
+	var err error
+	n := new(int32)
+	counter := new(int32)
+	l, err := NewListener(LoopBack.Name, 8000, "", EnginePcap, false)
+	if err != nil {
+		b.Error(err)
+		return
+	}
+	l.PcapOptions.BPFFilter = "udp dst port 8000 and host 127.0.0.1"
+	err = l.Activate()
+	if err != nil {
+		b.Error(err)
+		return
+	}
+	errCh := l.ListenBackground(context.Background(), handler(n, counter))
+	select {
+	case <-l.Reading:
+	case err = <-errCh:
+		b.Error(err)
+		return
+	}
+	var conn net.Conn
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		b.StopTimer()
+		conn, err = net.Dial("udp", "127.0.0.1:8000")
+		if err != nil {
+			b.Error(err)
+			return
+		}
+		b.StartTimer()
+		_, err = conn.Write(buf[:])
+		if err != nil {
+			b.Error(err)
+			return
+		}
+	}
+	b.ReportMetric(float64(atomic.LoadInt32(n)), "buf")
+	b.ReportMetric(float64(atomic.LoadInt32(counter)), "packets")
+}
+
+func BenchmarkRawSocket(b *testing.B) {
+	var err error
+	n := new(int32)
+	counter := new(int32)
+	l, err := NewListener(LoopBack.Name, 8000, "", EngineRawSocket, false)
+	if err != nil {
+		b.Error(err)
+		return
+	}
+	l.PcapOptions.BPFFilter = "udp dst port 8000 and host 127.0.0.1"
+	err = l.Activate()
+	if err != nil {
+		b.Error(err)
+		return
+	}
+	errCh := l.ListenBackground(context.Background(), handler(n, counter))
+	select {
+	case <-l.Reading:
+	case err = <-errCh:
+		b.Error(err)
+		return
+	}
+	var conn net.Conn
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		b.StopTimer()
+		conn, err = net.Dial("udp", "127.0.0.1:8000")
+		if err != nil {
+			b.Error(err)
+			return
+		}
+		b.StartTimer()
+		_, err = conn.Write(buf[:])
+		if err != nil {
+			b.Error(err)
+			return
+		}
+	}
+	b.ReportMetric(float64(atomic.LoadInt32(n)), "buf")
+	b.ReportMetric(float64(atomic.LoadInt32(counter)), "packets")
+}

capture/doc.go

@@ -0,0 +1,35 @@
+/*
+Package capture provides traffic sniffier using AF_PACKET, pcap or pcap file.
+it allows you to listen for traffic from any port (e.g. sniffing) because they operate on IP level.
+Ports is TCP/IP feature, same as flow control, reliable transmission and etc.
+Currently this package implements TCP layer: flow control is managed under tcp package.
+BPF filters can also be applied.
+
+example:
+
+// for the transport should be "tcp"
+listener, err := capture.NewListener(host, port, transport, engine, trackResponse)
+if err != nil {
+	// handle error
+}
+listener.SetPcapOptions(opts)
+err = listner.Activate()
+if err != nil {
+	// handle it
+}
+
+if err := listener.Listen(context.Background(), handler); err != nil {
+	 // handle error
+}
+// or
+errCh := listener.ListenBackground(context.Background(), handler) // runs in the backgorund
+select {
+case err := <- errCh:
+	// handle error
+case <-quit:
+	//
+case <- l.Reading: // if we have started reading
+}
+
+*/
+package capture // import github.com/buger/goreplay/capture

capture/dump.go

@@ -0,0 +1,126 @@
+// https://github.com/google/gopacket/blob/403ca653c4/pcapgo/read.go
+
+package capture
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+	"time"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+)
+
+// Writer wraps an underlying io.Writer to write packet data in PCAP
+// format.  See http://wiki.wireshark.org/Development/LibpcapFileFormat
+// for information on the file format.
+//
+// For those that care, we currently write v2.4 files with nanosecond
+// or microsecond timestamp resolution and little-endian encoding.
+type Writer struct {
+	w        io.Writer
+	tsScaler int
+	// Moving this into the struct seems to save an allocation for each call to writePacketHeader
+	buf [16]byte
+}
+
+const magicNanoseconds = 0xA1B23C4D
+const magicMicroseconds = 0xA1B2C3D4
+const versionMajor = 2
+const versionMinor = 4
+
+// NewWriterNanos returns a new writer object, for writing packet data out
+// to the given writer.  If this is a new empty writer (as opposed to
+// an append), you must call WriteFileHeader before WritePacket.  Packet
+// timestamps are written with nanosecond precision.
+//
+//  // Write a new file:
+//  f, _ := os.Create("/tmp/file.pcap")
+//  w := pcapgo.NewWriterNanos(f)
+//  w.WriteFileHeader(65536, layers.LinkTypeEthernet)  // new file, must do this.
+//  w.WritePacket(gopacket.CaptureInfo{...}, data1)
+//  f.Close()
+//  // Append to existing file (must have same snaplen and linktype)
+//  f2, _ := os.OpenFile("/tmp/fileNano.pcap", os.O_APPEND, 0700)
+//  w2 := pcapgo.NewWriter(f2)
+//  // no need for file header, it's already written.
+//  w2.WritePacket(gopacket.CaptureInfo{...}, data2)
+//  f2.Close()
+func NewWriterNanos(w io.Writer) *Writer {
+	return &Writer{w: w, tsScaler: nanosPerNano}
+}
+
+// NewWriter returns a new writer object, for writing packet data out
+// to the given writer.  If this is a new empty writer (as opposed to
+// an append), you must call WriteFileHeader before WritePacket.
+// Packet timestamps are written witn microsecond precision.
+//
+//  // Write a new file:
+//  f, _ := os.Create("/tmp/file.pcap")
+//  w := pcapgo.NewWriter(f)
+//  w.WriteFileHeader(65536, layers.LinkTypeEthernet)  // new file, must do this.
+//  w.WritePacket(gopacket.CaptureInfo{...}, data1)
+//  f.Close()
+//  // Append to existing file (must have same snaplen and linktype)
+//  f2, _ := os.OpenFile("/tmp/file.pcap", os.O_APPEND, 0700)
+//  w2 := pcapgo.NewWriter(f2)
+//  // no need for file header, it's already written.
+//  w2.WritePacket(gopacket.CaptureInfo{...}, data2)
+//  f2.Close()
+func NewWriter(w io.Writer) *Writer {
+	return &Writer{w: w, tsScaler: nanosPerMicro}
+}
+
+// WriteFileHeader writes a file header out to the writer.
+// This must be called exactly once per output.
+func (w *Writer) WriteFileHeader(snaplen uint32, linktype layers.LinkType) error {
+	var buf [24]byte
+	if w.tsScaler == nanosPerMicro {
+		binary.LittleEndian.PutUint32(buf[0:4], magicMicroseconds)
+	} else {
+		binary.LittleEndian.PutUint32(buf[0:4], magicNanoseconds)
+	}
+	binary.LittleEndian.PutUint16(buf[4:6], versionMajor)
+	binary.LittleEndian.PutUint16(buf[6:8], versionMinor)
+	// bytes 8:12 stay 0 (timezone = UTC)
+	// bytes 12:16 stay 0 (sigfigs is always set to zero, according to
+	//   http://wiki.wireshark.org/Development/LibpcapFileFormat
+	binary.LittleEndian.PutUint32(buf[16:20], snaplen)
+	binary.LittleEndian.PutUint32(buf[20:24], uint32(linktype))
+	_, err := w.w.Write(buf[:])
+	return err
+}
+
+const nanosPerMicro = 1000
+const nanosPerNano = 1
+
+func (w *Writer) writePacketHeader(ci gopacket.CaptureInfo) error {
+	t := ci.Timestamp
+	if t.IsZero() {
+		t = time.Now()
+	}
+	secs := t.Unix()
+	usecs := t.Nanosecond() / w.tsScaler
+	binary.LittleEndian.PutUint32(w.buf[0:4], uint32(secs))
+	binary.LittleEndian.PutUint32(w.buf[4:8], uint32(usecs))
+	binary.LittleEndian.PutUint32(w.buf[8:12], uint32(ci.CaptureLength))
+	binary.LittleEndian.PutUint32(w.buf[12:16], uint32(ci.Length))
+	_, err := w.w.Write(w.buf[:])
+	return err
+}
+
+// WritePacket writes the given packet data out to the file.
+func (w *Writer) WritePacket(ci gopacket.CaptureInfo, data []byte) error {
+	if ci.CaptureLength != len(data) {
+		return fmt.Errorf("capture length %d does not match data length %d", ci.CaptureLength, len(data))
+	}
+	if ci.CaptureLength > ci.Length {
+		return fmt.Errorf("invalid capture info %+v:  capture length > length", ci)
+	}
+	if err := w.writePacketHeader(ci); err != nil {
+		return fmt.Errorf("error writing packet header: %v", err)
+	}
+	_, err := w.w.Write(data)
+	return err
+}

capture/packet_test.go

@@ -0,0 +1,197 @@
+package capture
+
+import (
+	"encoding/binary"
+	"errors"
+	"testing"
+	"time"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+)
+
+func generateHeader4(seq uint32, length uint16) []byte {
+	hdr := make([]byte, 4+24+24, 4+24+24)
+	binary.BigEndian.PutUint32(hdr, uint32(layers.ProtocolFamilyIPv4))
+
+	ip := hdr[4:]
+	ip[0] = 4<<4 | 6
+	binary.BigEndian.PutUint16(ip[2:4], length+24+24)
+	ip[9] = uint8(layers.IPProtocolTCP)
+	copy(ip[12:16], []byte{127, 0, 0, 1})
+	copy(ip[16:], []byte{127, 0, 0, 1})
+
+	// set tcp header
+	tcp := ip[24:]
+	tcp[12] = 6 << 4
+	binary.BigEndian.PutUint16(tcp, 5535)
+	binary.BigEndian.PutUint16(tcp[2:], 8000)
+	binary.BigEndian.PutUint32(tcp[4:], seq)
+	return hdr
+}
+
+func generateHeader6(seq uint32, length uint16) []byte {
+	hdr := make([]byte, 4+40+32+24, 4+40+32+24)
+	binary.BigEndian.PutUint32(hdr, uint32(layers.ProtocolFamilyIPv6Linux))
+
+	ip := hdr[4:]
+	ip[0] = 6 << 4
+	binary.BigEndian.PutUint16(ip[4:], length+32+24)
+	var ipAddr [16]byte
+	ipAddr[15] = 0x01
+	copy(ip[8:], ip[:])
+	copy(ip[24:], ip[:])
+	copy(ip[40:], []byte{
+		// net-layer (IPv6-Opts)
+		0x2b, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		uint8(layers.IPProtocolTCP), 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	})
+
+	// set tcp header
+	tcp := ip[40+32:]
+	tcp[12] = 6 << 4
+	binary.BigEndian.PutUint16(tcp, 5535)
+	binary.BigEndian.PutUint16(tcp[2:], 8000)
+	binary.BigEndian.PutUint32(tcp[4:], seq)
+	return hdr
+}
+
+func Packets(start uint32, _len int, length uint16, version byte) []*Packet {
+	var packets = make([]*Packet, _len)
+	for i := start; i < start+uint32(_len); i++ {
+		var h []byte
+		if version == 4 {
+			h = generateHeader4(i, length)
+		} else {
+			h = generateHeader6(i, length)
+		}
+		d := append(h, make([]byte, int(length))...)
+		ci := &gopacket.CaptureInfo{Length: len(d), CaptureLength: len(d), Timestamp: time.Now()}
+		packets[i-start] = NewPacket(d, int(layers.LinkTypeLoop), 4, ci)
+	}
+	return packets
+}
+
+func TestIPv4Packet(t *testing.T) {
+	pckt := packet(append(generateHeader4(1024, 10), make([]byte, 10)...))
+	if pckt.Err != nil {
+		t.Error(pckt)
+		return
+	}
+	if err := packet(pckt.Data[:2]).Err; !errors.Is(err, ErrHdrLength("Link")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrLength("Link"), err)
+		return
+	}
+	if err := packet(pckt.Data[:20]).Err; !errors.Is(err, ErrHdrLength("IPv4")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrLength("IPv4"), err)
+		return
+	}
+	if err := packet(pckt.Data[:27]).Err; !errors.Is(err, ErrHdrLength("IPv4 opts")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrLength("IPv4 opts"), err)
+		return
+	}
+	if err := packet(pckt.Data[:40]).Err; !errors.Is(err, ErrHdrLength("TCP")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrLength("TCP opts"), err)
+		return
+	}
+	if err := packet(pckt.Data[:50]).Err; !errors.Is(err, ErrHdrLength("TCP opts")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrLength("TCP opts"), err)
+		return
+	}
+	pckt.TransLayer[12] = 0x10
+	if err := packet(pckt.Data[:50]).Err; !errors.Is(err, ErrHdrInvalid("TCP's data offset")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrInvalid("TCP's data offset"), err)
+		return
+	}
+	pckt.TransLayer[12] = 0x60
+	if err := packet(pckt.Data[:28]).Err; !errors.Is(err, ErrHdrMissing("TCP")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrMissing("TCP"), err)
+		return
+	}
+	pckt.NetLayer[9] = 0x02
+	if err := packet(pckt.Data).Err; !errors.Is(err, ErrHdrExpected("TCP")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrExpected("TCP"), err)
+		return
+	}
+	pckt.NetLayer[9] = 0x06
+	pckt.NetLayer[0] = 0x44
+	if err := packet(pckt.Data).Err; !errors.Is(err, ErrHdrInvalid("IPv4's IHL")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrInvalid("IPv4's IHL"), err)
+		return
+	}
+	pckt.NetLayer[0] = 0x56
+	if err := packet(pckt.Data).Err; !errors.Is(err, ErrHdrExpected("IPv4 or IPv6")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrExpected("IPv4 or IPv6"), err)
+		return
+	}
+}
+
+func TestIPv6Packet(t *testing.T) {
+	pckt := packet(append(generateHeader6(1024, 10), make([]byte, 10)...))
+	if pckt.Err != nil {
+		t.Error(pckt)
+		return
+	}
+	if err := packet(pckt.Data[:4]).Err; !errors.Is(err, ErrHdrMissing("IPv4 or IPv6")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrMissing("IPv4 or IPv6"), err)
+		return
+	}
+	if err := packet(pckt.Data[:40]).Err; !errors.Is(err, ErrHdrLength("IPv6")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrLength("IPv6"), err)
+		return
+	}
+	if err := packet(pckt.Data[:52]).Err; !errors.Is(err, ErrHdrLength("IPv6 opts")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrLength("IPv6 opts"), err)
+		return
+	}
+	if err := packet(pckt.Data[:80]).Err; !errors.Is(err, ErrHdrLength("TCP")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrLength("TCP opts"), err)
+		return
+	}
+	if err := packet(pckt.Data[:98]).Err; !errors.Is(err, ErrHdrLength("TCP opts")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrLength("TCP opts"), err)
+		return
+	}
+	pckt.TransLayer[12] = 0x10
+	if err := packet(pckt.Data).Err; !errors.Is(err, ErrHdrInvalid("TCP's data offset")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrInvalid("TCP's data offset"), err)
+		return
+	}
+	pckt.TransLayer[12] = 0x60
+	if err := packet(pckt.Data[:76]).Err; !errors.Is(err, ErrHdrMissing("TCP")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrMissing("TCP"), err)
+		return
+	}
+	pckt.NetLayer[56] = 0x02
+	if err := packet(pckt.Data).Err; !errors.Is(err, ErrHdrExpected("TCP")) {
+		t.Errorf("should fail with %q, got %q", ErrHdrExpected("TCP"), err)
+		return
+	}
+	pckt.NetLayer[56] = 0x06
+}
+
+func packet(data []byte) *Packet {
+	return NewPacket(data, int(layers.LinkTypeLoop), 4, &gopacket.CaptureInfo{})
+}
+
+func BenchmarkNewPacketIPv4(b *testing.B) {
+	data := append(generateHeader4(1204, 10), make([]byte, 10)...)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		if err := packet(data).Err; err != nil {
+			b.Error(err)
+		}
+	}
+}
+
+func BenchmarkNewPacketIPv6(b *testing.B) {
+	data := append(generateHeader6(1024, 10), make([]byte, 10)...)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		if err := packet(data).Err; err != nil {
+			b.Error(err)
+		}
+	}
+}

capture/sock_linux.go

@@ -0,0 +1,260 @@
+package capture
+
+import (
+	"fmt"
+	"net"
+	"sync"
+	"time"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+	"github.com/google/gopacket/pcap"
+)
+
+const (
+	// ETHALL htons(ETH_P_ALL)
+	ETHALL uint16 = unix.ETH_P_ALL<<8 | unix.ETH_P_ALL>>8
+	// BLOCKSIZE ring buffer block_size
+	BLOCKSIZE = 64 << 10
+	// BLOCKNR ring buffer block_nr
+	BLOCKNR = (2 << 20) / BLOCKSIZE // 2mb / 64kb
+	// FRAMESIZE ring buffer frame_size
+	FRAMESIZE = BLOCKSIZE
+	// FRAMENR ring buffer frame_nr
+	FRAMENR = BLOCKNR * BLOCKSIZE / FRAMESIZE
+	// MAPHUGE2MB 2mb huge map
+	MAPHUGE2MB = 21 << unix.MAP_HUGE_SHIFT
+)
+
+var tpacket2hdrlen = tpAlign(int(unsafe.Sizeof(unix.Tpacket2Hdr{})))
+
+// SockRaw is a linux M'maped af_packet socket
+type SockRaw struct {
+	mu          sync.Mutex
+	fd          int
+	ifindex     int
+	snaplen     int
+	pollTimeout uintptr
+	frame       uint32 // current frame
+	buf         []byte // points to the memory space of the ring buffer shared with the kernel.
+	loopIndex   int32  // this field must filled to avoid reading packet twice on a loopback device
+}
+
+// NewSocket returns new M'maped sock_raw on packet version 2.
+func NewSocket(ifi net.Interface) (*SockRaw, error) {
+	// sock create
+	fd, err := unix.Socket(unix.AF_PACKET, unix.SOCK_RAW, int(ETHALL))
+	if err != nil {
+		return nil, err
+	}
+	sock := &SockRaw{
+		fd:          fd,
+		ifindex:     ifi.Index,
+		snaplen:     FRAMESIZE,
+		pollTimeout: ^uintptr(0),
+	}
+
+	// set packet version
+	err = unix.SetsockoptInt(fd, unix.SOL_PACKET, unix.PACKET_VERSION, unix.TPACKET_V2)
+	if err != nil {
+		unix.Close(fd)
+		return nil, fmt.Errorf("setsockopt packet_version: %v", err)
+	}
+
+	// bind to interface
+	addr := unix.RawSockaddrLinklayer{
+		Family:   unix.AF_PACKET,
+		Protocol: ETHALL,
+		Ifindex:  int32(ifi.Index),
+	}
+	_, _, e := unix.Syscall(
+		unix.SYS_BIND,
+		uintptr(fd),
+		uintptr(unsafe.Pointer(&addr)),
+		uintptr(unix.SizeofSockaddrLinklayer),
+	)
+	if e != 0 {
+		unix.Close(fd)
+		return nil, e
+	}
+
+	// create shared-memory ring buffer
+	tp := &unix.TpacketReq{
+		Block_size: BLOCKSIZE,
+		Block_nr:   BLOCKNR,
+		Frame_size: FRAMESIZE,
+		Frame_nr:   FRAMENR,
+	}
+	err = unix.SetsockoptTpacketReq(sock.fd, unix.SOL_PACKET, unix.PACKET_RX_RING, tp)
+	if err != nil {
+		unix.Close(fd)
+		return nil, fmt.Errorf("setsockopt packet_rx_ring: %v", err)
+	}
+	sock.buf, err = unix.Mmap(
+		sock.fd,
+		0,
+		BLOCKSIZE*BLOCKNR,
+		unix.PROT_READ|unix.PROT_WRITE,
+		unix.MAP_SHARED|MAPHUGE2MB,
+	)
+	if err != nil {
+		unix.Close(fd)
+		return nil, fmt.Errorf("socket mmap error: %v", err)
+	}
+	return sock, nil
+}
+
+// ReadPacketData implements gopacket.PacketDataSource.
+func (sock *SockRaw) ZeroCopyReadPacketData() (buf []byte, ci gopacket.CaptureInfo, err error) {
+	sock.mu.Lock()
+	defer sock.mu.Unlock()
+	var tpHdr *unix.Tpacket2Hdr
+	poll := &unix.PollFd{
+		Fd:     int32(sock.fd),
+		Events: unix.POLLIN,
+	}
+	var i int
+read:
+	i = int(sock.frame * FRAMESIZE)
+	tpHdr = (*unix.Tpacket2Hdr)(unsafe.Pointer(&sock.buf[i]))
+	sock.frame = (sock.frame + 1) % FRAMENR
+
+	if tpHdr.Status&unix.TP_STATUS_USER == 0 {
+		_, _, e := unix.Syscall(unix.SYS_POLL, uintptr(unsafe.Pointer(poll)), 1, sock.pollTimeout)
+		if e != 0 && e != unix.EINTR {
+			return buf, ci, e
+		}
+		// it might be some other frame with data!
+		if tpHdr.Status&unix.TP_STATUS_USER == 0 {
+			goto read
+		}
+	}
+	tpHdr.Status = unix.TP_STATUS_KERNEL
+	sockAddr := (*unix.RawSockaddrLinklayer)(unsafe.Pointer(&sock.buf[i+tpacket2hdrlen]))
+
+	// parse out repeating packets on loopback
+	if sockAddr.Ifindex == sock.loopIndex && sock.frame%2 != 0 {
+		goto read
+	}
+
+	ci.Length = int(tpHdr.Len)
+	ci.Timestamp = time.Unix(int64(tpHdr.Sec), int64(tpHdr.Nsec))
+	ci.InterfaceIndex = int(sockAddr.Ifindex)
+	buf = make([]byte, tpHdr.Snaplen)
+	ci.CaptureLength = copy(buf, sock.buf[i+int(tpHdr.Mac):])
+
+	return
+}
+
+// Close closes the underlying socket
+func (sock *SockRaw) Close() (err error) {
+	sock.mu.Lock()
+	defer sock.mu.Unlock()
+	if sock.fd != -1 {
+		unix.Munmap(sock.buf)
+		sock.buf = nil
+		err = unix.Close(sock.fd)
+		sock.fd = -1
+	}
+	return
+}
+
+// SetSnapLen sets the maximum capture length to the given value.
+// for this to take effects on the kernel level SetBPFilter should be called too.
+func (sock *SockRaw) SetSnapLen(snap int) error {
+	sock.mu.Lock()
+	defer sock.mu.Unlock()
+	if snap < 0 {
+		return fmt.Errorf("expected %d snap length to be at least 0", snap)
+	}
+	if snap > FRAMESIZE {
+		snap = FRAMESIZE
+	}
+	sock.snaplen = snap
+	return nil
+}
+
+// SetTimeout sets poll wait timeout for the socket.
+// negative value will block forever
+func (sock *SockRaw) SetTimeout(t time.Duration) error {
+	sock.mu.Lock()
+	defer sock.mu.Unlock()
+	sock.pollTimeout = uintptr(t)
+	return nil
+}
+
+// GetSnapLen returns the maximum capture length
+func (sock *SockRaw) GetSnapLen() int {
+	sock.mu.Lock()
+	defer sock.mu.Unlock()
+	return sock.snaplen
+}
+
+// SetBPFFilter compiles and sets a BPF filter for the socket handle.
+func (sock *SockRaw) SetBPFFilter(expr string) error {
+	sock.mu.Lock()
+	defer sock.mu.Unlock()
+	if expr == "" {
+		return unix.SetsockoptInt(sock.fd, unix.SOL_SOCKET, unix.SO_DETACH_FILTER, 0)
+	}
+	filter, err := pcap.CompileBPFFilter(layers.LinkTypeEthernet, sock.snaplen, expr)
+	if err != nil {
+		return err
+	}
+	if len(filter) > int(^uint16(0)) {
+		return fmt.Errorf("filters out of range 0-%d", ^uint16(0))
+	}
+	if len(filter) == 0 {
+		return unix.SetsockoptInt(sock.fd, unix.SOL_SOCKET, unix.SO_DETACH_FILTER, 0)
+	}
+	fprog := &unix.SockFprog{
+		Len:    uint16(len(filter)),
+		Filter: &(*(*[]unix.SockFilter)(unsafe.Pointer(&filter)))[0],
+	}
+	return unix.SetsockoptSockFprog(sock.fd, unix.SOL_SOCKET, unix.SO_ATTACH_FILTER, fprog)
+}
+
+// SetPromiscuous sets promiscous mode to the required value. for better result capture on all interfaces instead.
+// If it is enabled, traffic not destined for the interface will also be captured.
+func (sock *SockRaw) SetPromiscuous(b bool) error {
+	sock.mu.Lock()
+	defer sock.mu.Unlock()
+	mreq := unix.PacketMreq{
+		Ifindex: int32(sock.ifindex),
+		Type:    unix.PACKET_MR_PROMISC,
+	}
+
+	opt := unix.PACKET_ADD_MEMBERSHIP
+	if !b {
+		opt = unix.PACKET_DROP_MEMBERSHIP
+	}
+
+	return unix.SetsockoptPacketMreq(sock.fd, unix.SOL_PACKET, opt, &mreq)
+}
+
+// Stats returns number of packets and dropped packets. This will be the number of packets/dropped packets since the last call to stats (not the cummulative sum!).
+func (sock *SockRaw) Stats() (*unix.TpacketStats, error) {
+	sock.mu.Lock()
+	defer sock.mu.Unlock()
+	return unix.GetsockoptTpacketStats(sock.fd, unix.SOL_PACKET, unix.PACKET_STATISTICS)
+}
+
+// SetLoopbackIndex necessary to avoid reading packet twice on a loopback device
+func (sock *SockRaw) SetLoopbackIndex(i int32) {
+	sock.mu.Lock()
+	defer sock.mu.Unlock()
+	sock.loopIndex = i
+}
+
+// WritePacketData transmits a raw packet.
+func (sock *SockRaw) WritePacketData(pkt []byte) error {
+	_, err := unix.Write(sock.fd, pkt)
+	return err
+}
+
+func tpAlign(x int) int {
+	return int((uint(x) + unix.TPACKET_ALIGNMENT - 1) &^ (unix.TPACKET_ALIGNMENT - 1))
+}

capture/sock_others.go

@@ -0,0 +1,13 @@
+// +build !linux
+
+package capture
+
+import (
+	"errors"
+	"net"
+)
+
+// NewSocket returns new M'maped sock_raw on packet version 2.
+func NewSocket(_ net.Interface) (Socket, error) {
+	return nil, errors.New("afpacket socket is only available on linux")
+}

capture/socket.go

@@ -0,0 +1,20 @@
+package capture
+
+import (
+	"time"
+
+	"github.com/google/gopacket"
+)
+
+// Socket is any interface that defines the behaviors of Socket
+type Socket interface {
+	ZeroCopyReadPacketData() ([]byte, gopacket.CaptureInfo, error)
+	WritePacketData([]byte) error
+	SetBPFFilter(string) error
+	SetPromiscuous(bool) error
+	SetSnapLen(int) error
+	GetSnapLen() int
+	SetTimeout(time.Duration) error
+	SetLoopbackIndex(i int32)
+	Close() error
+}

circle.yml

@@ -0,0 +1,7 @@
+dependencies:
+  pre:
+    - sudo apt-get install libpcap-dev -y
+
+test:
+  override:
+    - sudo bash -l -c "export GOPATH='/home/ubuntu/.go_workspace:/usr/local/go_workspace:/home/ubuntu/.go_project' && GORACE='halt_on_error=1' /usr/local/go/bin/go test ./... -v -timeout 120s -race"

docs/CNAME

@@ -0,0 +1 @@
+docs.goreplay.org

docs/Capturing-and-replaying-traffic.md

@@ -0,0 +1,49 @@
+Think about Gor more like a network analyzer or tcpdump on steroids, it is not a proxy and does not affect your app anyhow. You specify application port, and it will capture and replay incoming data.
+
+Simplest setup will be:
+```bash
+# Run on servers where you want to catch traffic. You can run it on every `web` machine.
+sudo gor --input-raw :80 --output-http http://staging.com
+```
+It will record and replay traffic from the same machine. However, it is possible to use [[Aggregator-forwarder setup]], when Gor on your web machines forward traffic to Gor aggregator instance running on the separate server.
+
+> You may notice that it require `sudo`: to analyze network Gor need permissions which available only to root users. However, it is possible to configure Gor [beign run for non-root users](Running as a non-root user).
+
+
+### Forwarding to multiple addresses
+
+You can forward traffic to multiple endpoints.
+```
+gor --input-tcp :28020 --output-http "http://staging.com"  --output-http "http://dev.com"
+```
+
+### Splitting traffic
+By default, it will send same traffic to all outputs, but you have options to equally split it (round-robin) using  `--split-output` option.
+
+```
+gor --input-raw :80 --output-http "http://staging.com"  --output-http "http://dev.com" --split-output true
+```
+
+### Tracking responses
+By default `input-raw` does not intercept responses, only requests. You can turn response tracking using `--input-raw-track-response` option. When enable you will be able to access response information in middleware and `output-file`.
+
+
+### Traffic interception engine
+By default, Gor will use `libpcap` for intercepting traffic, it should work in most cases. If you have any troubles with it, you may try alternative engine: `raw_socket`.
+
+```
+sudo gor --input-raw :80 --input-raw-engine "raw_socket" --output-http "http://staging.com"
+```
+
+You can read more about [[Replaying HTTP traffic]].
+
+
+### Tracking original IP addresses
+You can use `--input-raw-realip-header` option to specify header name: If not blank, injects header with given name and real IP value to the request payload. Usually, this header should be named: `X-Real-IP`, but you can specify any name.
+
+`gor --input-raw :80 --input-raw-realip-header "X-Real-IP" ...`
+
+
+***
+
+Also you may want to know about [[Rate limiting]], [[Request rewriting]] and [[Request filtering]]

docs/Compilation.md

@@ -0,0 +1,30 @@
+We provide pre-compiled binaries for Mac and Linux, but you are free to compile Gor by yourself.
+
+Gor is written using Go, so first you need to download it from here https://golang.org/, use the latest stable version. 
+
+The only Gor dependency is [libpcap](https://github.com/the-tcpdump-group/libpcap), which is the interface to various kernel packet capture mechanisms, and https://github.com/google/gopacket, which is a Go wrapper around libpcap. Latest libpcap version can be obtained at http://www.tcpdump.org/release/. Libpcap itself depend on `flex` and `bison` packages, many operating systems already have them installed.
+
+```bash
+# Fetch libpcap dependencies. Depending on your OS, instead of `apt` you will use `yum` or `rpm`, or `brew` on Mac.
+sudo apt-get install flex bison -y
+
+# Download latest stable release, compile and install it
+wget http://www.tcpdump.org/release/libpcap-1.7.4.tar.gz && tar xzf libpcap-1.7.4.tar.gz
+cd libpcap-1.7.4
+./configure && make install
+
+
+# Lets fetch Gor source code
+mkdir $HOME/gocode
+# See more information about GOPATH https://github.com/golang/go/wiki/GOPATH
+export GOPATH=$HOME/gocode
+# Fetch code from the Github
+go get github.com/buger/gor
+
+# Compile from source
+cd $HOME/gocode/src/github.com/buger/gor
+go build LDFLAGS = -ldflags "-extldflags \"-static\""
+```
+
+After you finished, you should see `gor` binary in current directory. 
+

docs/Development-Setup.md

@@ -0,0 +1,39 @@
+## STEP 1: Install Docker
+For local development we recommend to use Docker.
+
+If you don’t have it you can read how to install it here:
+https://docs.docker.com/engine/getstarted/step_one/#step-3-verify-your-installation
+
+## STEP 2: Download repository
+
+`git clone git@github.com:buger/goreplay.git`
+
+
+## STEP 3: Setup container
+
+```
+cd ./goreplay
+make build
+
+```
+
+## Testing
+To run tests execute next command:
+
+```
+make test
+```
+
+You can copy the command that is produced and modify it. For example, if you need to run one test copy the command and add `-run TestName`, e.g.:
+
+```
+docker run -v `pwd`:/go/src/github.com/buger/gor/ -p 0.0.0.0:8000:8000 -t -i gor:go go test ./. -run TestEmitterFiltered -timeout 60s -ldflags "-X main.VERSION=DEV-1482398347 -extldflags \"-static\""   -v
+```
+
+
+## Building
+To get a binary file run 
+
+```
+make release-bin
+```

docs/Distributed-configuration.md

@@ -0,0 +1,26 @@
+Sometimes it makes sense to use separate Gor instance for replaying traffic and performing things like load testing, so your production machines do not spend precious resources. It is possible to configure Gor on your web machines forward traffic to Gor aggregator instance running on the separate server.
+
+```bash
+# Run on servers where you want to catch traffic. You can run it on each `web` machine.
+sudo gor --input-raw :80 --output-tcp replay.local:28020
+
+# Replay server (replay.local).
+gor --input-tcp replay.local:28020 --output-http http://staging.com
+```
+
+If you have multiple replay machines you can split traffic among them using `--split-output` option: it will equally split all incoming traffic to all outputs using round robin algorithm.
+```
+gor --input-raw :80 --split-output --output-tcp replay1.local:28020 --output-tcp replay2.local:28020
+```
+
+[GoReplay PRO](https://goreplay.org/pro.html) support accurate recording and replaying of tcp sessions, and when `--recognize-tcp-sessions` option is passed, instead of round-robin it will use a smarter algorithm which ensures that same sessions will be sent to the same replay instance.
+
+
+In case if you are planning a large load testing, you may consider use separate master instance which will control Gor slaves which actually replay traffic. For example:
+```
+# This command will read multiple log files, replay them on 10x speed and loop them if needed for 30 seconds, and will distributed traffic (tcp session aware) among multiple workers
+gor --input-file logs_from_multiple_machines.*|1000% --input-file-loop --exit-after 30s --recognize-tcp-sessions --split-output --output-tcp worker1.local --output-tcp worker2.local:27017 --output-tcp worker3.local:27017 ...  --output-tcp workerN.local:27017
+
+# worker 
+gor --input-tcp :27017 --ouput-http load_test.target
+```

docs/Exporting-to-ElasticSearch.md

@@ -0,0 +1,38 @@
+Gor can export requests and replayed response data to ElasticSearch:
+
+```
+./gor --input-raw :8000 --output-http http://staging.com  --output-http-elasticsearch localhost:9200/gor
+```
+
+You don't have to create the index upfront. That will be done for you automatically.
+
+### Format
+
+Following structure represents ES format:
+
+```
+type ESRequestResponse struct {
+	ReqURL               string `json:"Req_URL"`
+	ReqMethod            string `json:"Req_Method"`
+	ReqUserAgent         string `json:"Req_User-Agent"`
+	ReqAcceptLanguage    string `json:"Req_Accept-Language,omitempty"`
+	ReqAccept            string `json:"Req_Accept,omitempty"`
+	ReqAcceptEncoding    string `json:"Req_Accept-Encoding,omitempty"`
+	ReqIfModifiedSince   string `json:"Req_If-Modified-Since,omitempty"`
+	ReqConnection        string `json:"Req_Connection,omitempty"`
+	ReqCookies           string `json:"Req_Cookies,omitempty"`
+	RespStatus           string `json:"Resp_Status"`
+	RespStatusCode       string `json:"Resp_Status-Code"`
+	RespProto            string `json:"Resp_Proto,omitempty"`
+	RespContentLength    string `json:"Resp_Content-Length,omitempty"`
+	RespContentType      string `json:"Resp_Content-Type,omitempty"`
+	RespTransferEncoding string `json:"Resp_Transfer-Encoding,omitempty"`
+	RespContentEncoding  string `json:"Resp_Content-Encoding,omitempty"`
+	RespExpires          string `json:"Resp_Expires,omitempty"`
+	RespCacheControl     string `json:"Resp_Cache-Control,omitempty"`
+	RespVary             string `json:"Resp_Vary,omitempty"`
+	RespSetCookie        string `json:"Resp_Set-Cookie,omitempty"`
+	Rtt                  int64  `json:"RTT"`
+	Timestamp            time.Time
+}
+```

docs/FAQ.md

@@ -0,0 +1,32 @@
+### What OS are supported?
+Gor will run everywhere where [libpcap](http://www.tcpdump.org/) works, and it works on most of the platforms. However, currently, we test it on Linux and Mac. See more about [[Compilation]].
+
+### Why does the `--input-raw` requires sudo or root access?
+Listener works by sniffing traffic from a given port. It's accessible
+only by using sudo or root access. But it is possible to [[Running as non root user]].
+
+### How do you deal with user session to replay the traffic correctly?
+You can rewrite session related headers/params to match your staging environment. If you require custom logic (e.g random token based auth) follow this discussion: https://github.com/buger/gor/issues/154
+
+### Can I use Gor to intercept SSL traffic?
+Basic idea is that SSL was made to protect itself from traffic interception. There 2 options: 
+1. Move SSL handling to proxy like Nginx or Amazon ELB. And allow Gor to listen on upstreams. 
+2. Use `--input-http` so you can duplicate request payload directly from your app to Gor, but it will require your app modifications.
+
+More can be find here: https://github.com/buger/gor/issues/85
+
+### Is there a limit for size of HTTP request when using output-http?
+Due to the fact that Gor can't guarantee interception of all packets, for large payloads > 200kb there is chance of missing some packets and corrupting body. Treat it as a feature and chance to test broken bodies handling :)
+The only way to guarantee delivery is using `--input-http`, but you will miss some features.
+
+### I'm getting 'too many open files' error
+Typical Linux shell has a small open files soft limit at 1024. You can easily raise that when you do this before starting your gor replay process:
+  
+  ulimit -n 64000
+
+More about ulimit: http://www.thecodingmachine.com/solving-the-too-many-open-files-exception-in-red5-or-any-other-application/
+
+### The CPU average across my load-balanced targets is higher than the source
+If you are replaying traffic from multiple listeners to a load-balanced target and you use sticky sessions, you may observe that the target servers have a higher CPU load than the listener servers. This may be because the sticky session cookie of the original load balancer is not honored by the target load balancer thus resulting in requests that would normally hit the same target server hitting different servers on the backend thus reducing some caching benefits gained via the load balancing.  Try running just one listener against one replay target and see if the CPU utilization comparison is more accurate.
+
+Also see [[Troubleshooting]].

docs/Middleware.md

@@ -0,0 +1,74 @@
+#### Overview
+Middleware is a program that accepts request and response payload at STDIN and emits modified requests at STDOUT. You can implement any custom logic like stripping private data, advanced rewriting, support for oAuth and etc. Check examples [included into our repo](https://github.com/buger/gor/tree/master/examples/middleware).
+
+
+```
+                   Original request      +--------------+
++-------------+----------STDIN---------->+              |
+|  Gor input  |                          |  Middleware  |
++-------------+----------STDIN---------->+              |
+                   Original response (1) +------+---+---+
+                                                |   ^
++-------------+    Modified request             v   |
+| Gor output  +<---------STDOUT-----------------+   |
++-----+-------+                                     |
+      |                                             |
+      |            Replayed response                |
+      +------------------STDIN----------------->----+
+```
+
+(1): Original responses will only be sent to the middleware if the `--input-raw-track-response` option is specified.
+
+Middleware can be written in any language, see `examples/middleware` folder for examples.
+Middleware program should accept the fact that all communication with Gor is asynchronous, there is no guarantee that original request and response messages will come one after each other. Your app should take care of the state if logic depends on original or replayed response, see `examples/middleware/token_modifier.go` as example.
+
+Simple bash echo middleware (returns same request) will look like this:
+```bash
+while read line; do
+  echo $line
+done
+```
+
+Middleware can be enabled using `--middleware` option, by specifying path to executable file:
+```
+gor --input-raw :80 --middleware "/opt/middleware_executable" --output-http "http://staging.server"
+```
+
+#### Communication protocol
+All messages should be hex encoded, new line character specifieds the end of the message, eg. new message per line.
+
+Decoded payload consist of 2 parts: header and HTTP payload, separated by new line character.  
+
+Example request payload:
+
+```
+1 932079936fa4306fc308d67588178d17d823647c 1439818823587396305
+GET /a HTTP/1.1
+Host: 127.0.0.1
+
+```
+
+Example response payload (note: you will only receive this if you specify `--input-raw-track-response`)
+
+```
+2 8e091765ae902fef8a2b7d9dd960e9d52222bd8c 1439818823587996305 2782013
+HTTP/1.1 200 OK
+Date: Mon, 17 Aug 2015 13:40:23 GMT
+Content-Length: 0
+Content-Type: text/plain; charset=utf-8
+
+```
+
+Header contains request meta information separated by spaces. First value is payload type, possible values: `1` - request, `2` - original response, `3` - replayed response.
+Next goes request id: unique among all requests (sha1 of time and Ack), but remain same for original and replayed response, so you can create associations between request and responses. The third argument is the time when request/response was initiated/received. Forth argument is populated only for responses and means latency.
+
+HTTP payload is unmodified HTTP requests/responses intercepted from network. You can read more about request format [here](http://www.jmarshall.com/easy/http/), [here](https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol) and [here](http://www.w3.org/Protocols/rfc2616/rfc2616.html). You can operate with payload as you want, add headers, change path, and etc. Basically you just editing a string, just ensure that it is RCF compliant.
+
+At the end modified (or untouched) request should be emitted back to STDOUT, keeping original header, and hex-encoded. If you want to filter request, just not send it. Emitting responses back is required, even if you did not touch them.
+
+#### Advanced example
+Imagine that you have auth system that randomly generate access tokens, which used later for accessing secure content. Since there is no pre-defined token value, naive approach without middleware (or if middleware use only request payloads) will fail, because replayed server have own tokens, not synced with origin. To fix this, our middleware should take in account responses of replayed and origin server, store `originalToken -> replayedToken` aliases and rewrite all requests using this token to use replayed alias. See [examples/middleware/token_modifier.go](https://github.com/buger/gor/tree/master/examples/middleware/token_modifier.go) and [middleware_test.go#TestTokenMiddleware](https://github.com/buger/gor/tree/master/middleware_test.go) as example of described scheme.
+
+***
+
+You may also read about [[Request filtering]], [[Rate limiting]] and [[Request rewriting]].

docs/Rate-limiting.md

@@ -0,0 +1,37 @@
+Rate limiting can be useful if you only want to forward parts of incoming traffic, for example, to not overload your test environment. There are two strategies: dropping random requests or dropping fractions of requests based on Header or URL param value. 
+
+### Dropping random requests
+Every input and output support random rate limiting.
+There are two limiting algorithms: absolute or percentage based. 
+
+**Absolute**: If for current second it reached specified requests limit - disregard the rest, on next second counter reset.
+
+**Percentage**: For input-file it will slowdown or speedup request execution, for the rest it will use the random generator to decide if request pass or not based on the chance you specified. 
+
+You can specify your desired limit using the "|" operator after the server address, see examples below.
+
+#### Limiting replay using absolute number
+```
+# staging.server will not get more than ten requests per second
+gor --input-tcp :28020 --output-http "http://staging.com|10"
+```
+
+#### Limiting listener using percentage based limiter
+```
+# replay server will not get more than 10% of requests 
+# useful for high-load environments
+gor --input-raw :80 --output-tcp "replay.local:28020|10%"
+```
+
+### Consistent limiting based on Header or URL param value
+If you have unique user id (like API key) stored in header or URL you can consistently forward specified percent of traffic only for the fraction of this users. 
+Basic formula looks like this: `FNV32-1A_hashing(value) % 100 >= chance`. Examples:
+```
+# Limit based on header value
+gor --input-raw :80 --output-tcp "replay.local:28020|10%" --http-header-limiter "X-API-KEY: 10%"
+
+# Limit based on header value
+gor --input-raw :80 --output-tcp "replay.local:28020|10%" --http-param-limiter "api_key: 10%"
+```
+
+When limiting based on header or param only percentage based limiting supported.

docs/Replaying-HTTP-traffic.md

@@ -0,0 +1,46 @@
+Gor can replay HTTP traffic using `--output-http` option:
+
+```bash
+sudo ./gor --input-raw :8000 --output-http="http://staging.env"
+```
+
+You can [filter](Request filtering), [rate limit](Rate limiting) and [rewrite](Request rewriting) requests on the fly. 
+
+### HTTP output workers
+By default Gor creates a dynamic pool of workers: it starts with 10 and creates more HTTP output workers when the HTTP output queue length is greater than 10.  The number of workers created (N) is equal to the queue length at the time which it is checked and found to have a length greater than 10. The queue length is checked every time a message is written to the HTTP output queue.  No more workers will be spawned until that request to spawn N workers is satisfied.  If a dynamic worker cannot process a message at that time, it will sleep for 100 milliseconds. If a dynamic worker cannot process a message for 2 seconds it dies.
+You may specify fixed number of workers using  `--output-http-workers=20` option.
+
+### Following redirects
+By default Gor will ignore all redirects since they are handled by clients using your app, but in scenarios where your replayed environment introduces new redirects, you can enable them like this: 
+```
+gor --input-tcp replay.local:28020 --output-http http://staging.com --output-http-redirects 2
+```
+The given example will follow up to 2 redirects per request.
+
+### HTTP timeouts
+By default http timeout for both request and response is 5 seconds. You can override it like this:
+```
+gor --input-tcp replay.local:28020 --output-http http://staging.com --output-http-timeout 30s
+```
+
+### Response buffer
+By default, to reduce memory consumption, internal HTTP client will fetch max 200kb of the response body (used if you use middleware), by you can increase limit using `--output-http-response-buffer` option (accepts number of bytes).
+
+### Basic Auth
+
+If your development or staging environment is protected by Basic Authentication then those credentials can be injected in during the replay:
+
+```
+gor --input-raw :80 --output-http "http://user:pass@staging.com"
+```
+
+Note: This will overwrite any Authorization headers in the original request.
+
+
+### Multiple domains support
+
+If you app accepts traffic from multiple domains, and you want to keep original headers, there is specific `--http-original-host` with tells Gor do not touch Host header at all.
+
+
+***
+You may also read about [[Saving and Replaying from file]]

docs/Request-filtering.md

@@ -0,0 +1,35 @@
+Filtering is useful when you need to capture only specific part of traffic, like API requests. It is possible to filter by URL, HTTP header or HTTP method.
+
+#### Allow url regexp
+```
+# only forward requests being sent to the /api endpoint
+gor --input-raw :8080 --output-http staging.com --http-allow-url /api
+```
+
+#### Disallow url regexp
+```
+# only forward requests NOT being sent to the /api... endpoint
+gor --input-raw :8080 --output-http staging.com --http-disallow-url /api
+```
+#### Filter based on regexp of header
+
+```
+# only forward requests with an api version of 1.0x
+gor --input-raw :8080 --output-http staging.com --http-allow-header api-version:^1\.0\d
+
+# only forward requests NOT containing User-Agent header value "Replayed by Gor"
+gor --input-raw :8080 --output-http staging.com --http-disallow-header "User-Agent: Replayed by Gor"
+```
+
+#### Filter based on HTTP method
+Requests not matching a specified whitelist can be filtered out. For example to strip non-nullipotent requests:
+
+```
+gor --input-raw :80 --output-http "http://staging.server" \
+    --http-allow-method GET \
+    --http-allow-method OPTIONS
+```
+
+
+-----
+You may also read about [[Request rewriting]], [[Rate limiting]] and [[Middleware]]

docs/Request-rewriting.md

@@ -0,0 +1,38 @@
+Gor supports rewriting of URLs, URL params and headers, see below.
+
+Rewriting may be useful if you test environment does not have the same data as your production, and you want to perform all actions in the context of `test` user: for example rewrite all API tokens to some test value. Other possible use cases are toggling features on/off using custom headers or rewriting URL's if they changed in the new environment.
+
+For more complex logic you can use [Middleware](middleware.md).
+
+#### Rewrite URL based on a mapping
+`--http-rewrite-url` expects value in "<search>:<replace>" format: ":" is a dilimiter. In `<replace>` section you may use captured regexp group values. This works similar to `replace` method in Javascript or `gsub` in Ruby. 
+
+```
+# Rewrites all `/v1/user/<user_id>/ping` requests to `/v2/user/<user_id>/ping`
+gor --input-raw :8080 --output-http staging.com --http-rewrite-url /v1/user/([^\\/]+)/ping:/v2/user/$1/ping
+```
+
+#### Set URL param
+Set request url param, if param already exists it will be overwritten.
+```
+gor --input-raw :8080 --output-http staging.com --http-set-param api_key=1
+```
+
+#### Set Header
+Set request header, if header already exists it will be overwritten. May be useful if you need to identify requests generated by Gor or enable feature flagged functionality in an application:
+
+```
+gor --input-raw :80 --output-http "http://staging.server" \
+    --http-set-header "User-Agent: Replayed by Gor" \
+    --http-set-header "Enable-Feature-X: true"
+```
+
+#### Host header
+Host header gets special treatment. By default Host get set to the value specified in --output-http. If you manually set --http-set-header "Host: anonther.com", Gor will not override Host value.
+
+If you app accepts traffic from multiple domains, and you want to keep original headers, there is specific `--http-original-host` with tells Gor do not touch Host header at all.
+
+
+***
+
+You may also read about [[Request filtering]], [[Rate limiting]] and [[Middleware]]

docs/Running-as-non-root-user.md

@@ -0,0 +1,17 @@
+You can enable Gor for non-root users in a secure method by using the following commands
+
+``` 
+# Following commands assume that you put `gor` binary to /usr/local/bin
+add gor
+addgroup <username> gor
+chgrp gor /usr/local/bin/gor
+chmod 0750 /usr/local/bin/gor
+setcap "cap_net_raw,cap_net_admin+eip" /usr/local/bin/gor
+```
+ 
+As a brief explanation of the above.
+* We create a group called gor. 
+* We then add the user you want to the new group so they will be able to use gor without sudo
+* We then change the user/group of gor binary the new group.
+* We then make sure the permissions are set on gor binary so that members of the group can execute it but other normal users cannot.
+* We then use `setcap` to give the CAP_NET_RAW and CAP_NET_ADMIN privilege to the executable when it runs. This is so that Gor can open its raw socket which is not normally permitted unless you are root.

docs/Saving-and-Replaying-from-file.md

@@ -0,0 +1,105 @@
+You can save requests to file, and replay them later. While replaying it will preserve the original time differences between requests. If you apply [percentage based limiting](Rate Limiting) timing between requests will be reduced or increased appropriately: this approach opens possibilities like load testing, see below.
+
+```bash
+# write to file
+gor --input-raw :80 --output-file requests.log
+
+# read from file
+gor --input-file requests.gor --output-http "http://staging.com"
+```
+
+By default Gor writes files in chunks. This configurable using `--output-file-append` option: the flushed chunk is appended to existence file or not. The default is **false**. By default, `--output-file` flushes each chunk to a different path.
+
+```bash
+gor ... --output-file %Y%m%d.log
+# append false
+20140608_0.log
+20140608_1.log
+20140609_0.log
+20140609_1.log
+```
+
+This makes parallel file processing easy. But if you want to disable this behavior, you can disable it by adding `--output-file-append` option:
+
+```bash
+gor ... --output-file %Y%m%d.log --output-file-append
+# append true
+20140608.log
+20140609.log
+```
+
+If you run gor multiple times, and it finds existing files, it will continue from last known index.
+
+### Chunk size
+
+You can set chunk limits using `--output-file-size-limit` and `--output-file-queue-limit` options.
+The length of the chunk queue and the size of each chunk, respectively. The default values are 256 and 32mb, respectively. The suffixes “k” (KB), “m” (MB), and “g” (GB) can be used for `output-file-size-limit`.
+If you want to have only size constraint, you can set `--output-file-queue-limit` to 0, and vice versa.
+
+```bash
+gor --input-raw :80 --output-file %Y-%m-%d.gz --output-file-size-limit 256m --output-file-queue-limit 0
+```
+
+### Using date variables in file names
+For example, you can tell to create new file each hour: `--output-file /mnt/logs/requests-%Y-%m-%d-%H.log`
+It will create new file for each hour: requests-2016-06-01-12.log, requests-2016-06-01-13.log, ...
+
+The time format used as part of the file name. The following characters are replaced with actual values when the file is created:
+
+* `%Y`: year including the century (at least 4 digits)
+* `%m`: month of the year (01..12)
+* `%d`: Day of the month (01..31)
+* `%H`: Hour of the day, 24-hour clock (00..23)
+* `%M`: Minute of the hour (00..59)
+* `%S`: Second of the minute (00..60)
+
+The default format is `%Y%m%d%H`, which creates one file per hour.
+
+
+### GZIP compression
+To read or write GZIP compressed files ensure that file extension ends with ".gz": `--output-file log.gz`
+
+### Replaying from multiple files
+
+`--input-file` accepts file pattern, for example: `--input-file logs-2016-05-*`: it will replay all the files, sorting them in lexicographical order.
+
+### Buffered file output
+Gor has memory buffer when it writes to file, and continuously flush changes to the file. Flushing to file happens if the buffer is filled, forced flush every 1 second, or if Gor is closed. You can change it using `--output-file-flush-interval` option. It most cases it should not be touched.
+
+### File format
+HTTP requests stored as it is, plain text: headers and bodies. Requests separated by `\n🐵🙈🙉\n` line (using such sequence for uniqueness and fun). Before each request goes single line with meta information containing payload type (1 - request, 2 - response, 3 - replayed response), unique request ID (request and response have the same) and timestamp when request was made. An example of 2 requests:
+
+```
+1 d7123dasd913jfd21312dasdhas31 127345969\n
+GET / HTTP/1.1\r\n
+\r\n
+\n
+🐵🙈🙉
+\n
+POST /upload HTTP/1.1\r\n
+Content-Length: 7\r\n
+Host: www.w3.org\r\n
+\r\n
+a=1&b=2
+```
+Note that technically \r and \n symbols are invisible, and indicate new lines. I made them visible in example just to show how it looks on byte level.
+
+Making it text friendly allows writing simple parsers and use console tools like `grep` to do an analysis. You can even edit them manually, but be sure that your file editor does not change line endings.
+
+## Performance testing
+
+Currently, this functionality supported only by `input-file` and only when using percentage based limiter. Unlike default limiter for `input-file` instead of dropping requests it will slowdown or speedup request emitting. Note that **limiter is applied to input**:
+
+```
+# Replay from file on 2x speed 
+gor --input-file "requests.gor|200%" --output-http "staging.com"
+```
+
+Use `--stats --output-http-stats` to see latency stats.
+
+### Looping files for replaying indefinitely
+You can loop the same set of files, so when the last one replays all the requests, it will not stop, and will start from first one again. Having the only small amount of requests you can do extensive performance testing.
+Pass `--input-file-loop` to make it work. 
+
+***
+You may also read about [[Capturing and replaying traffic]] and [[Rate limiting]]

docs/Troubleshooting.md

@@ -0,0 +1,90 @@
+Gor can report stats on the `output-tcp` and `output-http` request queues. Stats are reported to the console every 5 seconds in the form `latest,mean,max,count,count/second` by using the `--output-http-stats` and `--output-tcp-stats` options.
+
+Examples:
+
+```
+2014/04/23 21:17:50 output_tcp:latest,mean,max,count,count/second
+2014/04/23 21:17:50 output_tcp:0,0,0,0,0
+2014/04/23 21:17:55 output_tcp:1,1,2,68,13
+2014/04/23 21:18:00 output_tcp:1,1,2,92,18
+2014/04/23 21:18:05 output_tcp:1,1,2,119,23
+```
+
+```
+2014/04/23 21:19:46 output_http:latest,mean,max,count,count/second
+2014/04/23 21:19:46 output_http:0,0,0,0,0
+2014/04/23 21:19:51 output_http:0,0,0,0,0
+2014/04/23 21:19:56 output_http:0,0,0,0,0
+2014/04/23 21:20:01 output_http:1,0,1,50,10
+2014/04/23 21:20:06 output_http:1,1,4,72,14
+2014/04/23 21:20:11 output_http:1,0,1,179,35
+2014/04/23 21:20:16 output_http:1,0,1,148,29
+2014/04/23 21:20:21 output_http:1,1,2,91,18
+2014/04/23 21:20:26 output_http:1,1,2,150,30
+2014/04/23 21:18:15 output_http:100,99,100,70,14
+2014/04/23 21:18:21 output_http:100,99,100,55,11
+```
+
+### How can I tell if I have bottlenecks?
+Key areas that sometimes experience bottlenecks are the output-tcp and output-http functions which have internal queues for requests. Each queue has an upper limit of 100. Enable stats reporting to see if any queues are experiencing bottleneck behavior.
+ 
+#### Output HTTP bottlenecks
+When running a Gor replay the output-http feature may bottleneck if:
+
+  * the replay has inadequate bandwidth. If the replay is receiving or sending more messages than its network adapter can handle the output-http-stats  may report that the output-http queue is filling up. See if there is a way to upgrade the replay's bandwidth.
+  * with `--output-http-workers` set to anything other than `-1` the `-output-http` target is unable to respond to messages in a timely manner. The http output workers which take messages off the output-http queue, process the request, and ensure that the request did not result in an error may not be able to keep up with the number of incoming requests. If the replay is not using dynamic worker scaling (`--output-http-workers=-1`)  The optimal number of output-http-workers can be determined with the formula `output-workers = (Average number of requests per second)/(Average target response time per second)`.
+
+#### Output TCP bottlenecks
+When using the Gor listener the output-tcp feature may bottleneck if:
+
+  * the replay is unable to accept and process more requests than the listener is able generate. Prior to troubleshooting the output-tcp bottleneck, ensure that the replay target is not experiencing any bottlenecks. 
+  * the replay target has inadequate bandwidth to handle all its incoming requests.  If a replay target's incoming bandwidth is maxed out the output-tcp-stats may report that the output-tcp queue is filling up. See if there is a way to upgrade the replay's bandwidth.
+
+
+#### Tuning
+
+To achieve the top most performance you should tune the source server system limits:
+
+    net.ipv4.tcp_max_tw_buckets = 65536
+    net.ipv4.tcp_tw_recycle = 1
+    net.ipv4.tcp_tw_reuse = 0
+    net.ipv4.tcp_max_syn_backlog = 131072
+    net.ipv4.tcp_syn_retries = 3
+    net.ipv4.tcp_synack_retries = 3
+    net.ipv4.tcp_retries1 = 3
+    net.ipv4.tcp_retries2 = 8
+    net.ipv4.tcp_rmem = 16384 174760 349520
+    net.ipv4.tcp_wmem = 16384 131072 262144
+    net.ipv4.tcp_mem = 262144 524288 1048576
+    net.ipv4.tcp_max_orphans = 65536
+    net.ipv4.tcp_fin_timeout = 10
+    net.ipv4.tcp_low_latency = 1
+    net.ipv4.tcp_syncookies = 0
+***
+
+### Gor is crashing with following stacktrace
+```
+fatal error: unexpected signal during runtime execution
+[signal 0xb code=0x1 addr=0x63 pc=0x7ffcdfdf8b2c]
+
+runtime stack:
+runtime.throw(0xad8380, 0x2a)
+	/usr/local/go/src/runtime/panic.go:547 +0x90
+runtime.sigpanic()
+	/usr/local/go/src/runtime/sigpanic_unix.go:12 +0x5a
+
+goroutine 103 [syscall, locked to thread]:
+runtime.cgocall(0x7b35a0, 0xc82121f1e8, 0x0)
+	/usr/local/go/src/runtime/cgocall.go:123 +0x11b fp=0xc82121f188 sp=0xc82121f158
+net._C2func_getaddrinfo(0x7ffcec0008c0, 0x0, 0xc821b221e0, 0xc8217b2b18, 0x0, 0x0, 0x0)
+	??:0 +0x55 fp=0xc82121f1e8 sp=0xc82121f188
+net.cgoLookupIPCNAME(0x7fffb17208ab, 0x12, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xb17200)
+```
+
+There is a chance that you hit Go bug. The crash comes from the CGO version of DNS resolver.
+By default Go based version used, but ins some cases [it switches to CGO based](https://golang.org/pkg/net/#hdr-Name_Resolution). It is possible to force Go based DNS resolver using GODEBUG environment variable:
+`sudo GODEBUG="netdns=go" ./gor --input-raw :80 --output-http staging.env`
+
+
+
+Also, see [[FAQ]]

docs/_Footer.md

@@ -0,0 +1 @@
+[Website](https://goreplay.org) | [PRO version](https://goreplay.org/pro.html) | [[Getting started]] | [[FAQ]] | [Join newsletter](https://www.getdrip.com/forms/89690474/submissions/new)

docs/_config.yml

@@ -0,0 +1 @@
+theme: jekyll-theme-cayman

docs/commercial/collaboration.md

@@ -0,0 +1,19 @@
+Collaboration is difficult with commercial closed source but I do want to keep as much of the OSS ethos as possible available to customers who want to fix it themselves.
+
+## Legal
+
+In order to unambiguously own and sell Gor commercial products, I must have the copyright associated with the entire codebase.  Any code you create which is merged must be owned by me.  That's not me trying to be a jerk, that's just the way it works.
+
+## Application
+
+If you wish access to the product repository so you can send a PR, just open a new Gor issue and include the following info:
+
+1. the email address that bought the license, a max of one collaborator per license
+1. the following statement "I assign all rights, including copyright, to any future Gor work by myself to Leonid Bugaev"
+
+You should be granted access to the private repo soon after.
+
+## Notes
+
+1. You should **never** work on the master branch.  Only I may merge changes.
+1. I may revoke access for any reason at any time.  Access is not guaranteed with purchase.

docs/commercial/faq.md

@@ -0,0 +1,58 @@
+### What are GoReplay PRO and GoReplay Enterprise?
+
+[GoReplay PRO](https://goreplay.org/pro.html) and GoReplay Enterprise are extensions to GoReplay which add more functionality and provide additional support options for customers.
+
+### Is there a trial version?
+
+There's no free trial but we do offer a 14 day period with full refund if it does not work for you.
+
+### What is the license?
+
+See [COMM-LICENSE](https://github.com/buger/gor/blob/master/COMM-LICENSE) in the root of the GoReplay repo.
+
+### How does PRO licensing work?
+
+Every organization running GoReplay Pro on its own servers must have a license.  There's no limit to the amount of servers or environments used by that organization.
+
+### How does Enterprise licensing work?
+
+Every organization running Gor Enterprise on its own servers must have a license. There's **no limit** to the amount of servers or environments used by that organization.
+
+### What happens if my subscription lapses?
+
+You must have an active subscription to run GoReplay Pro or Enterprise.  After a one week grace period, you'll lose access to binaries and priority support.  You won't get any more updates or bug fixes.
+
+### How do I buy GoReplay Enterprise?
+
+Send email to [support@gortool.com](mailto:support@gortool.com) with your info.  A PDF quote will be emailed to you with the price.  Reply to that email with your purchase order or just "Sounds good" and we will send an invoice which can be paid with a credit card, ACH bank transfer or a paper check.
+
+### Can I upgrade from GoReplay Pro?
+
+Yes!  Current subscribers can upgrade by [requesting a quote](mailto:support@gortool.com).  **Please note that you are an existing Pro subscriber.**  We will add a one-time discount on your first invoice to reflect any remaining Pro subscription credit.  If you purchased GoReplay Pro 6 months ago for $950, you'll get a $475 discount.
+
+### Can I distribute GoReplay PRO or Enterprise to my customers?
+
+This is a common requirement for "on-site installs" or "appliances" sold to large corporations.
+
+The standard license is appropriate for SaaS usage as it does not allow distribution.  GoReplay PRO and Enterprise have an Appliance license option which **does** allow you to distribute them.  The Appliance license is $9,500/yr for Pro and $19,500/yr for Enterprise.  It allows you to distribute the Pro or Enterprise binaries as part of your application and each of your customers to run GoReplay Pro or Enterprise. Email [support@gortool.com](mailto:support@gortool.com) to purchase.
+
+### Can you transfer a license?
+
+Licenses are **not** transferable to another company.  We will transfer the license from a user-specific email to a group email address (e.g. john_smith@example.com -> tech@example.com) but only for **the same domain**.  It is strongly recommended that you buy the license using a group email address so the license is not attached to any one employee's email address.
+
+### What does the license require me to do?
+
+Your purchase gets you a unique access URL for downloading the Pro and/or Enterprise binaries.  The license agreement requires you to keep this access URL private.  If we find your access URL is ever publicized:
+
+1. We'll send you a warning email with details.  You need to remove the content and send a new email address so we can generate a new access URL for you.  The old access URL will stop working immediately so you'll need to update your apps.
+2. If your access URL is publicized a second time, we reserve the right to permanently remove access.
+
+### Can I get a refund?
+
+Yes, up to two weeks after purchase.  Let us know the reason and maybe we can help but either way it's not a problem.  Email [support@gortool.com](mailto:support@gortool.com).
+
+### How do I update my credit card info?
+
+If you purchased GoReplay Enterprise, there's nothing to do.  Each annual invoice is paid separately.
+
+If you purchased GoReplay PRO, log into [Gumroad](https://gumroad.com) with your email address, click the Billing tab and enter your new card.  I can't provide support for the Gumroad website and don't have the ability to edit customer info - if you can't log in or change your credit card, you can always let your current subscription expire and purchase a new subscription.

docs/commercial/support.md

@@ -0,0 +1,11 @@
+Gor offers only community support.  Gor Pro and Enterprise offer priority support via email.
+
+## Priority Support
+
+Covers 1 incident per quarter, with a max response time of 2 working days. Scope is limited to Gor and Gor Pro and Enterprise features and APIs, not the application or infrastructure.  For support, email **support** AT **gortool.com**.  Please email using the same domain as the original license email or explain your connection to the licensed company.
+
+More aggressive support contracts (phone, quicker response time) are available separately, email with your needs.
+
+## Onboarding
+
+Enterprise customers may request a one hour video chat session with @buger to discuss their application(s), requirements and how best to leverage the various Gor features.  Contact support to set up your session.

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docs/css/goreplay.css

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+.wy-menu-vertical li .rst-content tt,
+.rst-content .wy-menu-vertical li tt {
+  border: none;
+  background: inherit;
+  color: inherit;
+  padding-left: 0;
+  padding-right: 0
+}
+
+.wy-menu-vertical li span.toctree-expand {
+  display: block;
+  float: left;
+  margin-left: -1.2em;
+  font-size: .8em;
+  line-height: 1.6em;
+  color: #999;
+}
+
+.wy-menu-vertical li.on a,
+.wy-menu-vertical li.current>a {
+  color: rgba(0, 93, 255, 0.9);
+  font-weight: 700;
+  position: relative;
+  background: #fafafa;
+  border: none;
+}
+
+/*.wy-menu-vertical li.on a:hover span.toctree-expand,
+.wy-menu-vertical li.current>a:hover span.toctree-expand {
+  color: gray;
+}*/
+
+.wy-menu-vertical li.on a span.toctree-expand,
+.wy-menu-vertical li.current>a span.toctree-expand {
+  display: block;
+  font-size: .8em;
+  line-height: 1.6em;
+  color: #333;
+}
+
+.wy-menu-vertical li.toctree-l1.current li.toctree-l2>ul,
+.wy-menu-vertical li.toctree-l2.current li.toctree-l3>ul {
+  display: none;
+}
+
+.wy-menu-vertical li.toctree-l1.current li.toctree-l2.current>ul,
+.wy-menu-vertical li.toctree-l2.current li.toctree-l3.current>ul {
+  display: block;
+}
+
+.wy-menu-vertical li.toctree-l2.current li.toctree-l3>a {
+  display: block;
+  padding: .4045em 4.045em;
+}
+
+.wy-menu-vertical li.toctree-l2 a:hover span.toctree-expand {
+  color: #999;
+}
+
+.wy-menu-vertical li.toctree-l2 span.toctree-expand {
+  color: #999;
+}
+
+.wy-menu-vertical li.toctree-l3 {
+  background-color: #eee;
+  font-size: .9em;
+}
+
+.wy-menu-vertical li.toctree-l3.current>a {
+  padding: .4045em 4.045em;
+}
+
+.wy-menu-vertical li.toctree-l3.current li.toctree-l4>a {
+  display: block;
+  padding: .4045em 5.663em;
+  border-top: none;
+  border-bottom: none;
+}
+
+.wy-menu-vertical li.toctree-l3 a:hover span.toctree-expand {
+  color: rgba(0, 93, 255, 0.9);
+}
+
+.wy-menu-vertical li.toctree-l3 span.toctree-expand {
+  color: #999;
+}
+
+.wy-menu-vertical li.toctree-l4 {
+  font-size: .9em;
+}
+
+.wy-menu-vertical li.current ul {
+  display: block;
+}
+
+.wy-menu-vertical .local-toc li ul {
+  display: block;
+}
+
+.wy-menu-vertical li ul li a {
+  margin-bottom: 0;
+  color: rgba(0, 93, 255, 0.7);
+  font-weight: 400;
+}
+
+.wy-menu-vertical a {
+  display: inline-block;
+  line-height: 18px;
+  padding: .4045em 1.618em;
+  display: block;
+  position: relative;
+  font-size: 90%;
+  color: rgba(0, 93, 255, 0.7);
+}
+
+.wy-menu-vertical li.on a:hover,
+.wy-menu-vertical li.current>a:hover {
+  background-color: #fafafa;
+}
+
+.wy-menu-vertical a:hover {
+  color: rgba(0, 93, 255, 0.9);
+  cursor: pointer;
+  background-color: #fafafa;
+}
+
+.wy-menu-vertical a:hover span.toctree-expand {
+  color: rgba(0, 93, 255, 0.5);
+}
+
+.wy-menu-vertical a:active span.toctree-expand {
+  color: rgba(0, 93, 255, 0.7);
+}
+
+/* Search */
+
+.wy-side-nav-search {
+  z-index: 200;
+  background-color: #fafafa;
+  border-bottom: #333;
+  text-align: center;
+  padding: .809em;
+  display: block;
+  color: #333;
+  margin-bottom: .809em
+}
+
+.wy-side-nav-search input[type=text] {
+  width: 100%;
+  color: #333;
+  border-radius: 3px;
+  outline: 0;
+  padding: 10px;
+  background-color: #fff;
+  border: solid 1px #6d6d6d;
+  box-shadow: none
+}
+
+.wy-side-nav-search img {
+  display: block;
+  margin: auto auto .809em;
+  height: 45px;
+  width: 45px;
+  background-color: #2980B9;
+  padding: 5px;
+  border-radius: 100%
+}
+
+.wy-side-nav-search>a,
+.wy-side-nav-search .wy-dropdown>a {
+  color: #333;
+  font-size: 100%;
+  font-weight: 700;
+  display: inline-block;
+  padding: 4px 6px;
+  margin-bottom: .809em
+}
+
+.wy-side-nav-search>a:hover,
+.wy-side-nav-search .wy-dropdown>a:hover {
+  background: rgba(255,255,255,0.1)
+}
+
+.wy-side-nav-search>a img.logo,
+.wy-side-nav-search .wy-dropdown>a img.logo {
+  display: block;
+  margin: 0 auto;
+  height: auto;
+  width: auto;
+  border-radius: 0;
+  max-width: 100%;
+  background: transparent
+}
+
+.wy-side-nav-search>a.icon img.logo,
+.wy-side-nav-search .wy-dropdown>a.icon img.logo {
+  margin-top: .85em
+}
+
+.wy-nav .wy-menu-vertical header {
+  color: #2980B9
+}
+
+.wy-nav .wy-menu-vertical a {
+  color: #b3b3b3
+}
+
+.wy-nav .wy-menu-vertical a:hover {
+  background-color: #2980B9;
+  color: #fff
+}
+
+[data-menu-wrap] {
+  -webkit-transition: all .2s ease-in;
+  -moz-transition: all .2s ease-in;
+  transition: all .2s ease-in;
+  position: absolute;
+  opacity: 1;
+  width: 100%;
+  opacity: 0
+}
+
+[data-menu-wrap].move-center {
+  left: 0;
+  right: auto;
+  opacity: 1
+}
+
+[data-menu-wrap].move-left {
+  right: auto;
+  left: -100%;
+  opacity: 0
+}
+
+[data-menu-wrap].move-right {
+  right: -100%;
+  left: auto;
+  opacity: 0
+}
+
+.wy-body-for-nav {
+  background: left repeat-y #fcfcfc;
+  background-image: url(data:image/png;
+  base64,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);
+  background-size: 300px 1px
+}
+
+.wy-grid-for-nav {
+  position: absolute;
+  width: 100%;
+  height: 100%
+}
+
+.wy-nav-side {
+  position: fixed;
+  top: 0;
+  bottom: 0;
+  left: 0;
+  padding-bottom: 2em;
+  width: 300px;
+  overflow-x: hidden;
+  overflow-y: scroll;
+  min-height: 100%;
+  background-color: #fafafa;
+  z-index: 200;
+  border-right: 2px solid #eee;
+}
+
+.wy-nav-top {
+  display: none;
+  background-color: #333;
+  color: #fff;
+  padding: .4045em .809em;
+  position: relative;
+  line-height: 50px;
+  text-align: center;
+  font-size: 100%;
+  *zoom: 1
+}
+
+.wy-nav-top:before,
+.wy-nav-top:after {
+  display: table;
+  content: ""
+}
+
+.wy-nav-top:after {
+  clear: both
+}
+
+.wy-nav-top a {
+  color: #fff;
+  font-weight: 700
+}
+
+.wy-nav-top img {
+  margin-right: 12px;
+  height: 45px;
+  width: 45px;
+  background-color: #2980B9;
+  padding: 5px;
+  border-radius: 100%
+}
+
+.wy-nav-top i {
+  font-size: 30px;
+  line-height: 50px;
+  float: left;
+  cursor: pointer
+}
+
+.wy-nav-content-wrap {
+  margin-left: 300px;
+  background: #fcfcfc;
+  min-height: 100%
+}
+
+.wy-nav-content {
+  padding: 1.618em 3.236em;
+  height: 100%;
+  max-width: 1100px;
+  margin: auto
+}
+
+.wy-body-mask {
+  position: fixed;
+  width: 100%;
+  height: 100%;
+  background: rgba(0,0,0,0.2);
+  display: none;
+  z-index: 499
+}
+
+.wy-body-mask.on {
+  display: block
+}
+
+@media screen and (max-width: 768px) {
+  .wy-body-for-nav {
+    background: #fcfcfc
+  }
+
+  .wy-nav-top {
+    display: block
+  }
+
+  .wy-nav-side {
+    left: -300px
+  }
+
+  .wy-nav-side.shift {
+    width: 85%;
+    left: 0
+  }
+
+  .wy-nav-content-wrap {
+    margin-left: 0
+  }
+
+  .wy-nav-content-wrap .wy-nav-content {
+    padding: 1.618em
+  }
+
+  .wy-nav-content-wrap.shift {
+    position: fixed;
+    min-width: 100%;
+    left: 85%;
+    top: 0;
+    height: 100%;
+    overflow: hidden
+  }
+
+}
+
+@media screen and (min-width: 1400px) {
+  .wy-nav-content {
+    margin: 0;
+    background: #fcfcfc
+  }
+}

docs/getting-started/basics.md

@@ -0,0 +1,17 @@
+### Overview
+Gor architecture tries to follow UNIX philosophy: everything made of pipes, various inputs multiplexing data to outputs.
+
+You can [rate limit](/rate-limiting.md), [filter](request-filtering.md), [rewrite](request-rewriting.md) requests or even use your own [middleware](middleware.md) to implement custom logic. Also, it is possible to replay requests at the higher rate for [load testing](saving-and-replaying-from-file.md).
+
+### Available inputs
+
+* `--input-raw` - used to capture HTTP traffic, you should specify IP address or interface and application port. More about [[Capturing and replaying traffic]]. 
+* `--input-file` - accepts file which previously was recorded using ` --output-file`. More about [[Saving and Replaying from file]]
+* `--input-tcp` - used by Gor aggregation instance if you decided forward traffic from multiple forwarder Gor instances to it. Read about using [[Aggregator-forwarder setup]].
+
+### Available outputs
+
+* `--output-http` - replay HTTP traffic to given endpoint, accepts base url. Read [more about it](Replaying HTTP traffic)
+* `--output-file` - records incoming traffic to the file. More about [[Saving and Replaying from file]]
+* `--output-tcp` - forward incoming data to another Gor instance, used in conjunction with `--input-tcp`. Read more about [[Aggregator-forwarder setup]].
+* `--output-stdout` - used for debugging, outputs all data to stdout.

docs/getting-started/tutorial.md

@@ -0,0 +1,44 @@
+### Dependencies
+To start working with Gor, you need to have a web server running on your machine, and a terminal to run commands. If you are just poking around, you can quickly start the server by calling `gor file-server :8000`, this will start a simple file server of the current directory on port `8000`. 
+
+### Installing Gor
+Download the latest Gor binary from https://github.com/buger/gor/releases (we provide precompiled binaries for Windows, Linux x64 and Mac OS), or you can compile by yourself [[Compilation]].
+
+Once the archive is downloaded and uncompressed, you can run Gor from the current directory, or you may want to copy binary to your PATH (for Linux and Mac OS it can be `/usr/local/bin`).
+
+### Capturing web traffic
+Now run this command in terminal: `sudo ./gor --input-raw :8000 --output-stdout`
+
+This command says to listen for all network activity happening on port 8000 and log it to stdout.
+If you are familiar with `tcpdump`, we are going to implement similar functionality. 
+
+> You may notice that it uses `sudo` and asks for the password: to analyze network, Gor needs permissions which are available only to super users.
+> However, it is possible to configure Gor [being run for non-root users](Running-as-non-root-user).
+
+
+Make a few requests by opening `http://localhost:8000` in your browser, or just by calling curl in terminal `curl http://localhost:8000`. You should see that `gor` outputs all the HTTP requests and responses right to the terminal window where it is running. 
+
+
+**Gor is not a proxy:** you do not need to put 3-rd party tool to your critical path. Instead Gor just silently analyzes the traffic of your application and does not affect it anyhow.
+
+### Replaying
+
+Now it's time to replay your original traffic to another environment. Let's start the same file web server but on a different port: `gor file-server :8001`. 
+
+Instead of `--output-stdout` we will use `--output-http` and provide URL of second server: `sudo ./gor --input-raw :8000 --output-http="http://localhost:8001"`
+
+Make few requests to first server. You should see them replicated to the second one, voila! 
+
+### Saving requests to file and replaying them later
+Sometimes it's not possible to replay requests in real time; Gor allows you to save requests to the file and replay them later. 
+
+First use `--output-file` to save them: `sudo ./gor --input-raw :8000 --output-file=requests.gor`. This will create new file and continuously write all captured requests to it. 
+
+Let's re-run Gor, but now to replay requests from file: `./gor --input-file requests.gor --output-http="http://localhost:8001"`. You should see all the recorded requests coming to the second server, and they will be replayed in the same order and with exactly same timing as they were recorded.
+
+Next: [[The Basics]]
+
+### Watch an overview:
+
+
+![YOUTUBE](https://www.youtube.com/watch?v=CxuKZcMKaW4)

docs/index.md

@@ -0,0 +1,29 @@
+Gor is an open-source tool for capturing and replaying live HTTP traffic into a test environment in order to continuously test your system with real data. It can be used to increase confidence in code deployments, configuration changes and infrastructure changes.
+
+Read for more info:
+
+* [[Getting Started]]
+* [[The Basics]]
+* [[Capturing and replaying traffic]]
+* [[Replaying HTTP traffic]]
+* [[[PRO] Replaying Binary protocols]]
+* [[[PRO] Recording and replaying keep alive TCP sessions]]
+* [[Saving and Replaying from file]]
+* [Performance testing](https://github.com/buger/gor/wiki/Saving-and-Replaying-from-file#performance-testing)
+* [[Rate limiting]]
+* [[Request filtering]]
+* [[Request rewriting]]
+* [[Middleware]]
+* [[Distributed configuration]]
+* [[Exporting to ElasticSearch]]
+* [[FAQ]]
+* [[Troubleshooting]]
+
+## Commercial Aspects
+
+* [[Commercial Support]]
+* [[Commercial FAQ]]
+* [[Commercial collaboration]]
+
+
+Next: [Getting Started](Getting-Started)

docs/js/base.js

@@ -0,0 +1,7 @@
+$(document).ready(function () {
+    $('img[alt="YOUTUBE"]').each(function () {
+        var id = $(this).attr('src').split('/')[$(this).attr('src').split('/').length - 1].split("=")[1];
+        var video = '<iframe style="width: 100%;height: 450px;" src="https://www.youtube.com/embed/' + id + '" frameborder="0" allowfullscreen></iframe>';
+        $(this).replaceWith(video);
+    });
+});

docs/pro/recording-and-replaying-keep-alive-tcp-sessions.md

@@ -0,0 +1,11 @@
+> **This feature available only in PRO version. See https://goreplay.org/pro.html for details.**
+
+By default, GoReplay does not guarantee that when you record keep-alive TCP session, it will be replayed in the same TCP connection as well. This is ok for most of the cases, but it does not give an accurate number of TCP sessions while replaying, also may cause issues if your application state depends on TCP session (do not mess with HTTP session).
+
+[GoReplay PRO](https://goreplay.org/pro.html) extension adds support for accurate recording and replaying of keep-alive TCP sessions. Separate connection to your server is created per original session and it makes benchmarks and tests incredibly accurate. To enable session recognition you just need to pass `--recognize-tcp-sessions` option. 
+
+```
+gor --input-raw :80 --recognize-tcp-sessions --output-http http://test.target
+```
+
+Note that enabling this option also change algorithm of distributing traffic when using `--split-output`, see [Distributed configuration].

docs/pro/replaying-binary-protocols.md

@@ -0,0 +1,14 @@
+> **This feature available only in PRO version. See https://goreplay.org/pro.html for details.**
+
+Gor includes basic support for working with binary formats like `thrift` or `protocol-buffers`. To start set `--input-raw-protocol` to 'binary' (by default 'http'). For replaying, you should use `--output-binary`, example:
+
+```
+gor --input-raw :80 --input-raw-protocol binary --output-binary staging:8081
+```
+
+While working with `--input-raw` you may notice a 2-second delay before messages are emitted to the outputs. This behaviour is expected and happening because for general binary protocol it is impossible to know when TCP message ends, so Gor has to set inactivity timeout. Each protocol has own rules (for example write message length as first bytes), and require individual handling to know message length. We consider improving detailed protocol support for `thrift`, `protocol-buffer` and etc.
+
+Note that you can use all load testing features for binary protocols. For example, the following command will loop and replay recorded payload on 10x speed for 30 seconds:
+```
+gor --input-file './binary*.gor|1000%' --output-binary staging:9091 --input-file-loop --exit-after 30s
+```

elasticsearch.go

@@ -2,67 +2,81 @@ package main
 
 import (
 	"encoding/json"
-	"github.com/buger/elastigo/api"
-	"github.com/buger/elastigo/core"
 	"log"
-	"net/http"
-	"regexp"
+	"net/url"
+	"strings"
 	"time"
+
+	"github.com/buger/goreplay/proto"
+
+	elastigo "github.com/mattbaird/elastigo/lib"
 )
 
 type ESUriErorr struct{}
 
 func (e *ESUriErorr) Error() string {
-	return "Wrong ElasticSearch URL format. Expected to be: host:port/index_name"
+	return "Wrong ElasticSearch URL format. Expected to be: scheme://host/index_name"
 }
 
 type ESPlugin struct {
 	Active  bool
 	ApiPort string
+	eConn   *elastigo.Conn
 	Host    string
 	Index   string
-	indexor *core.BulkIndexer
+	indexor *elastigo.BulkIndexer
 	done    chan bool
 }
 
 type ESRequestResponse struct {
-	ReqUrl               string         `json:"Req_URL"`
-	ReqMethod            string         `json:"Req_Method"`
-	ReqUserAgent         string         `json:"Req_User-Agent"`
-	ReqAcceptLanguage    string         `json:"Req_Accept-Language,omitempty"`
-	ReqAccept            string         `json:"Req_Accept,omitempty"`
-	ReqAcceptEncoding    string         `json:"Req_Accept-Encoding,omitempty"`
-	ReqIfModifiedSince   string         `json:"Req_If-Modified-Since,omitempty"`
-	ReqConnection        string         `json:"Req_Connection,omitempty"`
-	ReqCookies           []*http.Cookie `json:"Req_Cookies,omitempty"`
-	RespStatus           string         `json:"Resp_Status"`
-	RespStatusCode       int            `json:"Resp_Status-Code"`
-	RespProto            string         `json:"Resp_Proto,omitempty"`
-	RespContentLength    int64          `json:"Resp_Content-Length,omitempty"`
-	RespContentType      string         `json:"Resp_Content-Type,omitempty"`
-	RespTransferEncoding []string       `json:"Resp_Transfer-Encoding,omitempty"`
-	RespContentEncoding  string         `json:"Resp_Content-Encoding,omitempty"`
-	RespExpires          string         `json:"Resp_Expires,omitempty"`
-	RespCacheControl     string         `json:"Resp_Cache-Control,omitempty"`
-	RespVary             string         `json:"Resp_Vary,omitempty"`
-	RespSetCookie        string         `json:"Resp_Set-Cookie,omitempty"`
-	Rtt                  int64          `json:"RTT"`
+	ReqURL               string `json:"Req_URL"`
+	ReqMethod            string `json:"Req_Method"`
+	ReqUserAgent         string `json:"Req_User-Agent"`
+	ReqAcceptLanguage    string `json:"Req_Accept-Language,omitempty"`
+	ReqAccept            string `json:"Req_Accept,omitempty"`
+	ReqAcceptEncoding    string `json:"Req_Accept-Encoding,omitempty"`
+	ReqIfModifiedSince   string `json:"Req_If-Modified-Since,omitempty"`
+	ReqConnection        string `json:"Req_Connection,omitempty"`
+	ReqCookies           string `json:"Req_Cookies,omitempty"`
+	RespStatus           string `json:"Resp_Status"`
+	RespStatusCode       string `json:"Resp_Status-Code"`
+	RespProto            string `json:"Resp_Proto,omitempty"`
+	RespContentLength    string `json:"Resp_Content-Length,omitempty"`
+	RespContentType      string `json:"Resp_Content-Type,omitempty"`
+	RespTransferEncoding string `json:"Resp_Transfer-Encoding,omitempty"`
+	RespContentEncoding  string `json:"Resp_Content-Encoding,omitempty"`
+	RespExpires          string `json:"Resp_Expires,omitempty"`
+	RespCacheControl     string `json:"Resp_Cache-Control,omitempty"`
+	RespVary             string `json:"Resp_Vary,omitempty"`
+	RespSetCookie        string `json:"Resp_Set-Cookie,omitempty"`
+	Rtt                  int64  `json:"RTT"`
 	Timestamp            time.Time
 }
 
 // Parse ElasticSearch URI
 //
-// Proper format is: host:port/index_name
-func parseURI(URI string) (err error, host string, port string, index string) {
-	rURI := regexp.MustCompile("(.+):([0-9]+)/(.+)")
-	match := rURI.FindAllStringSubmatch(URI, -1)
+// Proper format is: scheme://[userinfo@]host/index_name
+// userinfo is: user[:password]
+// net/url.Parse() does not fail if scheme is not provided but actualy does not
+// handle URI properly.
+// So we must 'validate' URI format to match requirements to use net/url.Parse()
+func parseURI(URI string) (err error, index string) {
 
-	if len(match) == 0 {
+	parsedUrl, parseErr := url.Parse(URI)
+
+	if parseErr != nil {
+		err = new(ESUriErorr)
+		return
+	}
+
+	//	check URL validity by extracting host and index values.
+	host := parsedUrl.Host
+	urlPathParts := strings.Split(parsedUrl.Path, "/")
+	index = urlPathParts[len(urlPathParts)-1]
+
+	// force index specification in uri : ie no implicit index
+	if host == "" || index == "" {
 		err = new(ESUriErorr)
-	} else {
-		host = match[0][1]
-		port = match[0][2]
-		index = match[0][3]
 	}
 
 	return
@@ -71,36 +85,35 @@ func parseURI(URI string) (err error, host string, port string, index string) {
 func (p *ESPlugin) Init(URI string) {
 	var err error
 
-	err, p.Host, p.ApiPort, p.Index = parseURI(URI)
+	err, p.Index = parseURI(URI)
 
 	if err != nil {
 		log.Fatal("Can't initialize ElasticSearch plugin.", err)
 	}
 
-	api.Domain = p.Host
-	api.Port = p.ApiPort
+	p.eConn = elastigo.NewConn()
 
-	p.indexor = core.NewBulkIndexerErrors(50, 60)
+	p.eConn.SetFromUrl(URI)
+
+	p.indexor = p.eConn.NewBulkIndexerErrors(50, 60)
 	p.done = make(chan bool)
-	p.indexor.Run(p.done)
+	p.indexor.Start()
 
-	// Only start the ErrorHandler goroutine when in verbose mode
-	// no need to burn ressources otherwise
-	// go p.ErrorHandler()
+	go p.ErrorHandler()
 
-	log.Println("Initialized Elasticsearch Plugin")
+	Debug(1, "Initialized Elasticsearch Plugin")
 	return
 }
 
 func (p *ESPlugin) IndexerShutdown() {
-	p.done <- true
+	p.indexor.Stop()
 	return
 }
 
 func (p *ESPlugin) ErrorHandler() {
 	for {
 		errBuf := <-p.indexor.ErrorChannel
-		log.Println(errBuf.Err)
+		Debug(1, "[ELASTICSEARCH]", errBuf.Err)
 	}
 }
 
@@ -111,8 +124,9 @@ func (p *ESPlugin) RttDurationToMs(d time.Duration) int64 {
 	return int64(fl)
 }
 
-func (p *ESPlugin) ResponseAnalyze(req *http.Request, resp *http.Response, start, stop time.Time) {
-	if resp == nil {
+// ResponseAnalyze send req and resp to ES
+func (p *ESPlugin) ResponseAnalyze(req, resp []byte, start, stop time.Time) {
+	if len(resp) == 0 {
 		// nil http response - skipped elasticsearch export for this request
 		return
 	}
@@ -120,34 +134,34 @@ func (p *ESPlugin) ResponseAnalyze(req *http.Request, resp *http.Response, start
 	rtt := p.RttDurationToMs(stop.Sub(start))
 
 	esResp := ESRequestResponse{
-		ReqUrl:               req.URL.String(),
-		ReqMethod:            req.Method,
-		ReqUserAgent:         req.UserAgent(),
-		ReqAcceptLanguage:    req.Header.Get("Accept-Language"),
-		ReqAccept:            req.Header.Get("Accept"),
-		ReqAcceptEncoding:    req.Header.Get("Accept-Encoding"),
-		ReqIfModifiedSince:   req.Header.Get("If-Modified-Since"),
-		ReqConnection:        req.Header.Get("Connection"),
-		ReqCookies:           req.Cookies(),
-		RespStatus:           resp.Status,
-		RespStatusCode:       resp.StatusCode,
-		RespProto:            resp.Proto,
-		RespContentLength:    resp.ContentLength,
-		RespContentType:      resp.Header.Get("Content-Type"),
-		RespTransferEncoding: resp.TransferEncoding,
-		RespContentEncoding:  resp.Header.Get("Content-Encoding"),
-		RespExpires:          resp.Header.Get("Expires"),
-		RespCacheControl:     resp.Header.Get("Cache-Control"),
-		RespVary:             resp.Header.Get("Vary"),
-		RespSetCookie:        resp.Header.Get("Set-Cookie"),
+		ReqURL:               string(proto.Path(req)),
+		ReqMethod:            string(proto.Method(req)),
+		ReqUserAgent:         string(proto.Header(req, []byte("User-Agent"))),
+		ReqAcceptLanguage:    string(proto.Header(req, []byte("Accept-Language"))),
+		ReqAccept:            string(proto.Header(req, []byte("Accept"))),
+		ReqAcceptEncoding:    string(proto.Header(req, []byte("Accept-Encoding"))),
+		ReqIfModifiedSince:   string(proto.Header(req, []byte("If-Modified-Since"))),
+		ReqConnection:        string(proto.Header(req, []byte("Connection"))),
+		ReqCookies:           string(proto.Header(req, []byte("Cookie"))),
+		RespStatus:           string(proto.Status(resp)),
+		RespStatusCode:       string(proto.Status(resp)),
+		RespProto:            string(proto.Method(resp)),
+		RespContentLength:    string(proto.Header(resp, []byte("Content-Length"))),
+		RespContentType:      string(proto.Header(resp, []byte("Content-Type"))),
+		RespTransferEncoding: string(proto.Header(resp, []byte("Transfer-Encoding"))),
+		RespContentEncoding:  string(proto.Header(resp, []byte("Content-Encoding"))),
+		RespExpires:          string(proto.Header(resp, []byte("Expires"))),
+		RespCacheControl:     string(proto.Header(resp, []byte("Cache-Control"))),
+		RespVary:             string(proto.Header(resp, []byte("Vary"))),
+		RespSetCookie:        string(proto.Header(resp, []byte("Set-Cookie"))),
 		Rtt:                  rtt,
 		Timestamp:            t,
 	}
 	j, err := json.Marshal(&esResp)
 	if err != nil {
-		log.Println(err)
+		Debug(0, "[ELASTIC-RESPONSE]", err)
 	} else {
-		p.indexor.Index(p.Index, "RequestResponse", "", "", &t, j, true)
+		p.indexor.Index(p.Index, "RequestResponse", "", "", "", &t, j)
 	}
 	return
 }

elasticsearch_test.go

@@ -0,0 +1,140 @@
+package main
+
+import (
+	"testing"
+)
+
+const expectedIndex = "gor"
+
+func assertExpectedGorIndex(index string, t *testing.T) {
+	if expectedIndex != index {
+		t.Fatalf("Expected index %s but got %s", expectedIndex, index)
+	}
+}
+
+func assertExpectedIndex(expectedIndex string, index string, t *testing.T) {
+	if expectedIndex != index {
+		t.Fatalf("Expected index %s but got %s", expectedIndex, index)
+	}
+}
+
+func assertExpectedError(returnedError error, t *testing.T) {
+	expectedError := new(ESUriErorr)
+
+	if expectedError != returnedError {
+		t.Errorf("Expected err %s but got %s", expectedError, returnedError)
+	}
+}
+
+func assertNoError(returnedError error, t *testing.T) {
+	if nil != returnedError {
+		t.Errorf("Expected no err but got %s", returnedError)
+	}
+}
+
+// Argument host:port/index_name
+// i.e : localhost:9200/gor
+// Fail because scheme is mandatory
+func TestElasticConnectionBuildFailWithoutScheme(t *testing.T) {
+	uri := "localhost:9200/" + expectedIndex
+
+	err, _ := parseURI(uri)
+	assertExpectedError(err, t)
+}
+
+// Argument scheme://Host:port
+// i.e : http://localhost:9200
+// Fail : explicit index is required
+func TestElasticConnectionBuildFailWithoutIndex(t *testing.T) {
+	uri := "http://localhost:9200"
+
+	err, index := parseURI(uri)
+
+	assertExpectedIndex("", index, t)
+
+	assertExpectedError(err, t)
+}
+
+// Argument scheme://Host/index_name
+// i.e : http://localhost/gor
+func TestElasticConnectionBuildFailWithoutPort(t *testing.T) {
+	uri := "http://localhost/" + expectedIndex
+
+	err, index := parseURI(uri)
+
+	assertNoError(err, t)
+
+	assertExpectedGorIndex(index, t)
+}
+
+// Argument scheme://Host:port/index_name
+// i.e : http://localhost:9200/gor
+func TestElasticLocalConnectionBuild(t *testing.T) {
+	uri := "http://localhost:9200/" + expectedIndex
+
+	err, index := parseURI(uri)
+
+	assertNoError(err, t)
+
+	assertExpectedGorIndex(index, t)
+}
+
+// Argument scheme://Host:port/index_name
+// i.e : http://localhost.local:9200/gor or https://localhost.local:9200/gor
+func TestElasticSimpleLocalWithSchemeConnectionBuild(t *testing.T) {
+	uri := "http://localhost.local:9200/" + expectedIndex
+
+	err, index := parseURI(uri)
+
+	assertNoError(err, t)
+
+	assertExpectedGorIndex(index, t)
+}
+
+// Argument scheme://Host:port/index_name
+// i.e : http://localhost.local:9200/gor or https://localhost.local:9200/gor
+func TestElasticSimpleLocalWithHTTPSConnectionBuild(t *testing.T) {
+	uri := "https://localhost.local:9200/" + expectedIndex
+
+	err, index := parseURI(uri)
+
+	assertNoError(err, t)
+
+	assertExpectedGorIndex(index, t)
+}
+
+// Argument scheme://Host:port/index_name
+// i.e : localhost.local:9200/pathtoElastic/gor
+func TestElasticLongPathConnectionBuild(t *testing.T) {
+	uri := "http://localhost.local:9200/pathtoElastic/" + expectedIndex
+
+	err, index := parseURI(uri)
+
+	assertNoError(err, t)
+
+	assertExpectedGorIndex(index, t)
+}
+
+// Argument scheme://Host:userinfo@port/index_name
+// i.e : http://user:password@localhost.local:9200/gor
+func TestElasticBasicAuthConnectionBuild(t *testing.T) {
+	uri := "http://user:password@localhost.local:9200/" + expectedIndex
+
+	err, index := parseURI(uri)
+
+	assertNoError(err, t)
+
+	assertExpectedGorIndex(index, t)
+}
+
+// Argument scheme://Host:port/path/index_name
+// i.e : http://localhost.local:9200/path/gor or https://localhost.local:9200/path/gor
+func TestElasticComplexPathConnectionBuild(t *testing.T) {
+	uri := "http://localhost.local:9200/path/" + expectedIndex
+
+	err, index := parseURI(uri)
+
+	assertNoError(err, t)
+
+	assertExpectedGorIndex(index, t)
+}

emitter.go

@@ -1,53 +1,204 @@
 package main
 
 import (
+	"fmt"
+	"hash/fnv"
 	"io"
+	"log"
+	"runtime"
+	"sync"
+	"time"
+
+	"github.com/buger/goreplay/byteutils"
+
+	"github.com/pbnjay/memory"
 )
 
-func Start(stop chan int) {
-	for _, in := range Plugins.Inputs {
-		go CopyMulty(in, Plugins.Outputs...)
-	}
+// Emitter represents an abject to manage plugins communication
+type Emitter struct {
+	sync.WaitGroup
+	plugins *InOutPlugins
+}
 
-	select {
-	case <-stop:
-		return
+// NewEmitter creates and initializes new Emitter object.
+func NewEmitter() *Emitter {
+	return &Emitter{}
+}
+
+// Start initialize loop for sending data from inputs to outputs
+func (e *Emitter) Start(plugins *InOutPlugins, middlewareCmd string) {
+	if Settings.CopyBufferSize < 1 {
+		Settings.CopyBufferSize = 5 << 20
+	}
+	e.plugins = plugins
+
+	if middlewareCmd != "" {
+		middleware := NewMiddleware(middlewareCmd)
+
+		for _, in := range plugins.Inputs {
+			middleware.ReadFrom(in)
+		}
+
+		e.plugins.Inputs = append(e.plugins.Inputs, middleware)
+		e.plugins.All = append(e.plugins.All, middleware)
+		e.Add(1)
+		go func() {
+			defer e.Done()
+			if err := CopyMulty(middleware, plugins.Outputs...); err != nil {
+				Debug(2, fmt.Sprintf("[EMITTER] error during copy: %q", err))
+			}
+		}()
+	} else {
+		for _, in := range plugins.Inputs {
+			e.Add(1)
+			go func(in PluginReader) {
+				defer e.Done()
+				if err := CopyMulty(in, plugins.Outputs...); err != nil {
+					Debug(2, fmt.Sprintf("[EMITTER] error during copy: %q", err))
+				}
+			}(in)
+		}
 	}
 }
 
-// Copy from 1 reader to multiple writers
-func CopyMulty(src io.Reader, writers ...io.Writer) (err error) {
-	buf := make([]byte, 32*1024)
+// Close closes all the goroutine and waits for it to finish.
+func (e *Emitter) Close() {
+	fmt.Println("Closing!")
+	for _, p := range e.plugins.All {
+		if cp, ok := p.(io.Closer); ok {
+			cp.Close()
+		}
+	}
+	if len(e.plugins.All) > 0 {
+		// wait for everything to stop
+		e.Wait()
+	}
+
+	fmt.Println("Closed!")
+	e.plugins.All = nil // avoid Close to make changes again
+}
+
+// CopyMulty copies from 1 reader to multiple writers
+func CopyMulty(src PluginReader, writers ...PluginWriter) error {
 	wIndex := 0
+	modifier := NewHTTPModifier(&Settings.ModifierConfig)
+	filteredRequests := make(map[string]int64)
+	filteredRequestsLastCleanTime := time.Now().UnixNano()
+	filteredCount := 0
 
 	for {
-		nr, er := src.Read(buf)
-		if nr > 0 && len(buf) > nr{
-			Debug("Sending", src, ": ", string(buf[0:nr]))
+		msg, err := src.PluginRead()
+		if err != nil {
+			if err == ErrorStopped || err == io.EOF {
+				return nil
+			}
+			return err
+		}
 
-			if Settings.splitOutput {
-				// Simple round robin
-				writers[wIndex].Write(buf[0:nr])
+		if msg != nil && len(msg.Data) > 0 {
+			if len(msg.Data) > int(Settings.CopyBufferSize) {
+				msg.Data = msg.Data[:Settings.CopyBufferSize]
+			}
+			meta := payloadMeta(msg.Meta)
+			if len(meta) < 3 {
+				Debug(2, fmt.Sprintf("[EMITTER] Found malformed record %q from %q", msg.Meta, src))
+				continue
+			}
+			requestID := byteutils.SliceToString(meta[1])
+			// start a subroutine only when necessary
+			if Settings.Verbose >= 3 {
+				Debug(3, "[EMITTER] input: ", byteutils.SliceToString(msg.Meta[:len(msg.Meta)-1]), " from: ", src)
+			}
+			if modifier != nil {
+				Debug(3, "[EMITTER] modifier:", requestID, "from:", src)
+				if isRequestPayload(msg.Meta) {
+					msg.Data = modifier.Rewrite(msg.Data)
+					// If modifier tells to skip request
+					if len(msg.Data) == 0 {
+						filteredRequests[requestID] = time.Now().UnixNano()
+						filteredCount++
+						continue
+					}
+					Debug(3, "[EMITTER] Rewritten input:", requestID, "from:", src)
 
-				wIndex++
-
-				if wIndex >= len(writers) {
-					wIndex = 0
-				}
-			} else {
-				for _, dst := range writers {
-					dst.Write(buf[0:nr])
+				} else {
+					if _, ok := filteredRequests[requestID]; ok {
+						delete(filteredRequests, requestID)
+						filteredCount--
+						continue
+					}
 				}
 			}
 
+			if Settings.PrettifyHTTP {
+				msg.Data = prettifyHTTP(msg.Data)
+				if len(msg.Data) == 0 {
+					continue
+				}
+			}
+
+			if Settings.SplitOutput {
+				if Settings.RecognizeTCPSessions {
+					if !PRO {
+						log.Fatal("Detailed TCP sessions work only with PRO license")
+					}
+					hasher := fnv.New32a()
+					hasher.Write(meta[1])
+
+					wIndex = int(hasher.Sum32()) % len(writers)
+					if _, err := writers[wIndex].PluginWrite(msg); err != nil {
+						return err
+					}
+				} else {
+					// Simple round robin
+					if _, err := writers[wIndex].PluginWrite(msg); err != nil {
+						return err
+					}
+
+					wIndex = (wIndex + 1) % len(writers)
+				}
+			} else {
+				for _, dst := range writers {
+					if _, err := dst.PluginWrite(msg); err != nil {
+						return err
+					}
+				}
+			}
 		}
-		if er == io.EOF {
-			break
-		}
-		if er != nil {
-			err = er
-			break
+
+		// Run GC on each 1000 request
+		if filteredCount > 0 && filteredCount%1000 == 0 {
+			// Clean up filtered requests for which we didn't get a response to filter
+			now := time.Now().UnixNano()
+			if now-filteredRequestsLastCleanTime > int64(60*time.Second) {
+				for k, v := range filteredRequests {
+					if now-v > int64(60*time.Second) {
+						delete(filteredRequests, k)
+						filteredCount--
+					}
+				}
+				filteredRequestsLastCleanTime = time.Now().UnixNano()
+			}
 		}
 	}
-	return err
+}
+
+func memUsage() (uint64, uint64) {
+	var m runtime.MemStats
+	runtime.ReadMemStats(&m)
+	// fmt.Printf("Current memory usage: ")
+	// // For info on each, see: https://golang.org/pkg/runtime/#MemStats
+	// fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))
+	// fmt.Printf("\tTotalAlloc = %v MiB", bToMb(m.TotalAlloc))
+	// fmt.Printf("\tSys = %v MiB", bToMb(m.Sys))
+	// fmt.Printf("\tNumGC = %v\n", m.NumGC)
+
+	// fmt.Printf("Total available memory %v MiB\n", bToMb(memory.TotalMemory()))
+	// fmt.Printf("Currently using %.2f %% of memory\n", 100*float64(m.Alloc+m.Sys)/float64(memory.TotalMemory()))
+
+	return m.Alloc + m.Sys, memory.TotalMemory()
+}
+
+func bToMb(b uint64) uint64 {
+	return b / 1024 / 1024
 }

emitter_test.go

@@ -1,25 +1,36 @@
 package main
 
 import (
-	"io"
+	"fmt"
+	"os"
 	"sync"
 	"sync/atomic"
 	"testing"
+	"time"
 )
 
+func TestMain(m *testing.M) {
+	PRO = true
+	code := m.Run()
+	os.Exit(code)
+}
+
 func TestEmitter(t *testing.T) {
 	wg := new(sync.WaitGroup)
-	quit := make(chan int)
 
 	input := NewTestInput()
-	output := NewTestOutput(func(data []byte) {
+	output := NewTestOutput(func(*Message) {
 		wg.Done()
 	})
 
-	Plugins.Inputs = []io.Reader{input}
-	Plugins.Outputs = []io.Writer{output}
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
 
-	go Start(quit)
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
 
 	for i := 0; i < 1000; i++ {
 		wg.Add(1)
@@ -27,34 +38,85 @@ func TestEmitter(t *testing.T) {
 	}
 
 	wg.Wait()
-
-	close(quit)
+	emitter.Close()
 }
 
-func TestEmitterRoundRobin(t *testing.T) {
+func TestEmitterFiltered(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	input := NewTestInput()
+	input.skipHeader = true
+
+	output := NewTestOutput(func(*Message) {
+		wg.Done()
+	})
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
+
+	methods := HTTPMethods{[]byte("GET")}
+	Settings.ModifierConfig = HTTPModifierConfig{Methods: methods}
+
+	emitter := &Emitter{}
+	go emitter.Start(plugins, "")
+
+	wg.Add(2)
+
+	id := uuid()
+	reqh := payloadHeader(RequestPayload, id, time.Now().UnixNano(), -1)
+	reqb := append(reqh, []byte("POST / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n")...)
+
+	resh := payloadHeader(ResponsePayload, id, time.Now().UnixNano()+1, 1)
+	respb := append(resh, []byte("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")...)
+
+	input.EmitBytes(reqb)
+	input.EmitBytes(respb)
+
+	id = uuid()
+	reqh = payloadHeader(RequestPayload, id, time.Now().UnixNano(), -1)
+	reqb = append(reqh, []byte("GET / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n")...)
+
+	resh = payloadHeader(ResponsePayload, id, time.Now().UnixNano()+1, 1)
+	respb = append(resh, []byte("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")...)
+
+	input.EmitBytes(reqb)
+	input.EmitBytes(respb)
+
+	wg.Wait()
+	emitter.Close()
+
+	Settings.ModifierConfig = HTTPModifierConfig{}
+}
+
+func TestEmitterSplitRoundRobin(t *testing.T) {
 	wg := new(sync.WaitGroup)
-	quit := make(chan int)
 
 	input := NewTestInput()
 
 	var counter1, counter2 int32
 
-	output1 := NewTestOutput(func(data []byte) {
+	output1 := NewTestOutput(func(*Message) {
 		atomic.AddInt32(&counter1, 1)
 		wg.Done()
 	})
 
-	output2 := NewTestOutput(func(data []byte) {
+	output2 := NewTestOutput(func(*Message) {
 		atomic.AddInt32(&counter2, 1)
 		wg.Done()
 	})
 
-	Plugins.Inputs = []io.Reader{input}
-	Plugins.Outputs = []io.Writer{output1, output2}
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output1, output2},
+	}
 
-	Settings.splitOutput = true
+	Settings.SplitOutput = true
 
-	go Start(quit)
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
 
 	for i := 0; i < 1000; i++ {
 		wg.Add(1)
@@ -63,29 +125,131 @@ func TestEmitterRoundRobin(t *testing.T) {
 
 	wg.Wait()
 
-	close(quit)
+	emitter.Close()
+
+	if counter1 == 0 || counter2 == 0 || counter1 != counter2 {
+		t.Errorf("Round robin should split traffic equally: %d vs %d", counter1, counter2)
+	}
+
+	Settings.SplitOutput = false
+}
+
+func TestEmitterRoundRobin(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	input := NewTestInput()
+
+	var counter1, counter2 int32
+
+	output1 := NewTestOutput(func(*Message) {
+		counter1++
+		wg.Done()
+	})
+
+	output2 := NewTestOutput(func(*Message) {
+		counter2++
+		wg.Done()
+	})
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output1, output2},
+	}
+	plugins.All = append(plugins.All, input, output1, output2)
+
+	Settings.SplitOutput = true
+
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
+
+	for i := 0; i < 1000; i++ {
+		wg.Add(1)
+		input.EmitGET()
+	}
+
+	wg.Wait()
+	emitter.Close()
 
 	if counter1 == 0 || counter2 == 0 {
 		t.Errorf("Round robin should split traffic equally: %d vs %d", counter1, counter2)
 	}
 
-	Settings.splitOutput = false
+	Settings.SplitOutput = false
+}
+
+func TestEmitterSplitSession(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	wg.Add(200)
+
+	input := NewTestInput()
+	input.skipHeader = true
+
+	var counter1, counter2 int32
+
+	output1 := NewTestOutput(func(msg *Message) {
+		if payloadID(msg.Meta)[0] == 'a' {
+			counter1++
+		}
+		wg.Done()
+	})
+
+	output2 := NewTestOutput(func(msg *Message) {
+		if payloadID(msg.Meta)[0] == 'b' {
+			counter2++
+		}
+		wg.Done()
+	})
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output1, output2},
+	}
+
+	Settings.SplitOutput = true
+	Settings.RecognizeTCPSessions = true
+
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
+
+	for i := 0; i < 200; i++ {
+		// Keep session but randomize
+		id := make([]byte, 20)
+		if i&1 == 0 { // for recognizeTCPSessions one should be odd and other will be even number
+			id[0] = 'a'
+		} else {
+			id[0] = 'b'
+		}
+		input.EmitBytes([]byte(fmt.Sprintf("1 %s 1 1\nGET / HTTP/1.1\r\n\r\n", id[:20])))
+	}
+
+	wg.Wait()
+
+	if counter1 != counter2 {
+		t.Errorf("Round robin should split traffic equally: %d vs %d", counter1, counter2)
+	}
+
+	Settings.SplitOutput = false
+	Settings.RecognizeTCPSessions = false
+	emitter.Close()
 }
 
 func BenchmarkEmitter(b *testing.B) {
 	wg := new(sync.WaitGroup)
-	quit := make(chan int)
 
 	input := NewTestInput()
 
-	output := NewTestOutput(func(data []byte) {
+	output := NewTestOutput(func(*Message) {
 		wg.Done()
 	})
 
-	Plugins.Inputs = []io.Reader{input}
-	Plugins.Outputs = []io.Writer{output}
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
 
-	go Start(quit)
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
 
 	b.ResetTimer()
 
@@ -95,5 +259,5 @@ func BenchmarkEmitter(b *testing.B) {
 	}
 
 	wg.Wait()
-	close(quit)
+	emitter.Close()
 }

examples/middleware/echo.clj

@@ -0,0 +1,53 @@
+(ns echo.core
+  (:gen-class)
+  (:require [clojure.string :as cs]
+            [clojure.java.io :as io])
+  (:import org.apache.commons.codec.binary.Hex
+           java.io.BufferedReader
+           java.io.IOException
+           java.io.InputStreamReader))
+
+
+(defn transform-http-msg
+  "Function that transforms/filters the incoming HTTP messages."
+  [headers body]
+  ;; do actual transformations here
+  [headers body])
+
+
+(defn decode-hex-string
+  "Decode an Hex-encoded string."
+  [s]
+  (String. (Hex/decodeHex (.toCharArray s))))
+
+
+(defn encode-hex-string
+  "Encode a string to a hex-encoded string."
+  [^String s]
+  (String. (Hex/encodeHex (.getBytes s))))
+
+
+(defn -main
+  [& args]
+  (let [br (BufferedReader. (InputStreamReader. System/in))]
+    (try
+      (loop [hex-line (.readLine br)]
+        (let [decoded-req (decode-hex-string hex-line)
+
+              ;; empty line separates headers from body
+              http-request (partition-by empty? (cs/split-lines decoded-req))
+              headers (first http-request)
+
+              ;; HTTP messages can contain no body:
+              body (when (= 3 (count http-request)) (last http-request))
+              [new-headers new-body] (transform-http-msg headers body)]
+
+          (println (encode-hex-string (str (cs/join "\n" headers)
+                                           (when body
+                                             (str "\n\n"
+                                                  (cs/join "\n" body)))))))
+        (when-let [line (.readLine br)]
+          (recur line)))
+      (catch IOException e nil))))
+
+

examples/middleware/echo.java

@@ -0,0 +1,48 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Hex;
+
+
+class Echo {
+    public static String decodeHexString(String s) throws DecoderException {
+        return new String(Hex.decodeHex(s.toCharArray()));
+    }
+
+    public static String encodeHexString(String s) {
+        return new String(Hex.encodeHex(s.getBytes()));
+    }
+
+    public static String transformHTTPMessage(String req) {
+        // do actual transformations here
+        return req;
+    }
+
+    public static void main(String[] args) throws DecoderException {
+        if(args != null){
+            for(String arg : args){
+                System.out.println(arg);
+            }
+
+        }
+
+        BufferedReader stdin = new BufferedReader(new InputStreamReader(
+                                                                        System.in));
+        String line = null;
+
+        try {
+            while ((line = stdin.readLine()) != null) {
+                String decodedLine = decodeHexString(line);
+
+                String transformedLine = transformHTTPMessage(decodedLine);
+
+                String encodedLine = encodeHexString(transformedLine);
+                System.out.println(encodedLine);
+
+            }
+        } catch (IOException e) {
+        }
+    }
+}

examples/middleware/echo.js

@@ -0,0 +1,57 @@
+#!/usr/bin/env node
+const readline = require("readline");
+const StringDecoder = require("string_decoder").StringDecoder
+
+const rl = readline.createInterface({
+  input: process.stdin
+});
+
+var ignoreIds = new Set();
+var ignoreAddresses = "/api";
+const decoder = new StringDecoder("utf8");
+
+function convertHexString(hex) {
+  var bytes = [];
+  for (var i = 0; i < hex.length - 1; i += 2) {
+    bytes.push(parseInt(hex.substr(i, 2), 16));
+  }
+  return decoder.write(Buffer.from(bytes));
+}
+
+function log(output) {
+	console.error("===================");
+	console.error(output);
+}
+
+function shouldOutputLine(request) {
+  const components = request.split("\n");
+  const header = components[0].split(" ");
+  const type = parseInt(header[0]);
+  const tag = header[1];
+
+  if (type === 3) {
+    return true;
+  }
+  if (type === 1) {
+    // Check if it's oauth
+    const endpoint = components[1].split(" ")[1];
+    if (!endpoint.startsWith(ignoreAddresses)) {
+      ignoreIds.add(tag);
+      return false;
+    }
+  } else if (type === 2) {
+    if (ignoreIds.has(tag)) {
+      ignoreIds.delete(tag);
+      return false;
+    }
+  }
+  return true;
+}
+
+rl.on("line", (input) => {
+  const str = convertHexString(input);
+  console.log(input);
+  if (shouldOutputLine(str)) {
+    log(str);
+	}
+});

examples/middleware/echo.py

@@ -0,0 +1,76 @@
+#! /usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import sys
+import fileinput
+import binascii
+
+# Used to find end of the Headers section
+EMPTY_LINE = b'\r\n\r\n'
+
+
+def log(msg):
+    """
+    Logging to STDERR as STDOUT and STDIN used for data transfer
+    @type msg: str or byte string
+    @param msg: Message to log to STDERR
+    """
+    try:
+        msg = str(msg) + '\n'
+    except:
+        pass
+    sys.stderr.write(msg)
+    sys.stderr.flush()
+
+
+def find_end_of_headers(byte_data):
+    """
+    Finds where the header portion ends and the content portion begins.
+    @type byte_data: str or byte string
+    @param byte_data: Hex decoded req or resp string
+    """
+    return byte_data.index(EMPTY_LINE) + 4
+
+
+def process_stdin():
+    """
+    Process STDIN and output to STDOUT
+    """
+    for raw_line in fileinput.input():
+
+        line = raw_line.rstrip()
+
+        # Decode base64 encoded line
+        decoded = bytes.fromhex(line)
+
+        # Split into metadata and payload, the payload is headers + body
+        (raw_metadata, payload) = decoded.split(b'\n', 1)
+
+        # Split into headers and payload
+        headers_pos = find_end_of_headers(payload)
+        raw_headers = payload[:headers_pos]
+        raw_content = payload[headers_pos:]
+
+        log('===================================')
+        request_type_id = int(raw_metadata.split(b' ')[0])
+        log('Request type: {}'.format({
+          1: 'Request',
+          2: 'Original Response',
+          3: 'Replayed Response'
+        }[request_type_id]))
+        log('===================================')
+
+        log('Original data:')
+        log(line)
+
+        log('Decoded request:')
+        log(decoded)
+
+        encoded = binascii.hexlify(raw_metadata + b'\n' + raw_headers + raw_content).decode('ascii')
+        log('Encoded data:')
+        log(encoded)
+
+        sys.stdout.write(encoded + '\n')
+
+if __name__ == '__main__':
+    process_stdin()

examples/middleware/echo.rb

@@ -0,0 +1,22 @@
+#!/usr/bin/env ruby
+# encoding: utf-8
+while data = STDIN.gets # continuously read line from STDIN
+  next unless data
+  data = data.chomp # remove end of line symbol
+  
+  decoded = [data].pack("H*") # decode base64 encoded request
+  
+  # decoded value is raw HTTP payload, example:
+  #   
+  #   POST /post HTTP/1.1
+  #   Content-Length: 7
+  #   Host: www.w3.org
+  #
+  #   a=1&b=2"
+  
+  encoded = decoded.unpack("H*").first # encoding back to base64
+  
+  # Emit request back
+  # You can skip this if want to filter out request
+  STDOUT.puts encoded
+end

examples/middleware/echo.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+#
+# `xxd` utility included into vim-common package
+# It allow hex decoding/encoding
+# 
+# This example may broke if you request contains `null` string, you may consider using pipes instead.
+# See: https://github.com/buger/gor/issues/309
+# 
+
+function log {
+    if [[ ! -v GOR_TEST ]]; then # if we are not testing
+    # Logging to stderr, because stdout/stdin used for data transfer
+    >&2 echo "[DEBUG][ECHO] $1"
+    fi
+}
+
+while read line; do
+    decoded=$(echo -e "$line" | xxd -r -p)
+
+    header=$(echo -e "$decoded" | head -n +1)
+    payload=$(echo -e "$decoded" | tail -n +2)
+
+    encoded=$(echo -e "$header\n$payload" | xxd -p | tr -d "\\n")
+
+    log ""
+    log "==================================="
+
+    case ${header:0:1} in
+    "1")
+        log "Request type: Request"
+        ;;
+    "2")
+        log "Request type: Original Response"
+        ;;
+    "3")
+        log "Request type: Replayed Response"
+        ;;
+    *)
+        log "Unknown request type $header"
+    esac
+    echo "$encoded"
+
+    log "==================================="
+
+    log "Original data: $line"
+    log "Decoded request: $decoded"
+    log "Encoded data: $encoded"
+done;

examples/middleware/token_modifier.go

@@ -0,0 +1,122 @@
+/*
+This middleware made for auth system that randomly generate access tokens, which used later for accessing secure content. Since there is no pre-defined token value, naive approach without middleware (or if middleware use only request payloads) will fail, because replayed server have own tokens, not synced with origin. To fix this, our middleware should take in account responses of replayed and origin server, store `originalToken -> replayedToken` aliases and rewrite all requests using this token to use replayed alias. See `middleware_test.go#TestTokenMiddleware` test for examples of using this middleware.
+
+How middleware works:
+
+                   Original request      +--------------+
++-------------+----------STDIN---------->+              |
+|  Gor input  |                          |  Middleware  |
++-------------+----------STDIN---------->+              |
+                   Original response     +------+---+---+
+                                                |   ^
++-------------+    Modified request             v   |
+| Gor output  +<---------STDOUT-----------------+   |
++-----+-------+                                     |
+      |                                             |
+      |            Replayed response                |
+      +------------------STDIN----------------->----+
+*/
+
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/hex"
+	"fmt"
+	"os"
+
+	"github.com/buger/goreplay/proto"
+)
+
+// requestID -> originalToken
+var originalTokens map[string][]byte
+
+// originalToken -> replayedToken
+var tokenAliases map[string][]byte
+
+func main() {
+	originalTokens = make(map[string][]byte)
+	tokenAliases = make(map[string][]byte)
+
+	scanner := bufio.NewScanner(os.Stdin)
+
+	for scanner.Scan() {
+		encoded := scanner.Bytes()
+		buf := make([]byte, len(encoded)/2)
+		hex.Decode(buf, encoded)
+
+		process(buf)
+	}
+}
+
+func process(buf []byte) {
+	// First byte indicate payload type, possible values:
+	//  1 - Request
+	//  2 - Response
+	//  3 - ReplayedResponse
+	payloadType := buf[0]
+	headerSize := bytes.IndexByte(buf, '\n') + 1
+	header := buf[:headerSize-1]
+
+	// Header contains space separated values of: request type, request id, and request start time (or round-trip time for responses)
+	meta := bytes.Split(header, []byte(" "))
+	// For each request you should receive 3 payloads (request, response, replayed response) with same request id
+	reqID := string(meta[1])
+	payload := buf[headerSize:]
+
+	Debug("Received payload:", string(buf))
+
+	switch payloadType {
+	case '1': // Request
+		if bytes.Equal(proto.Path(payload), []byte("/token")) {
+			originalTokens[reqID] = []byte{}
+			Debug("Found token request:", reqID)
+		} else {
+			token, vs, _ := proto.PathParam(payload, []byte("token"))
+
+			if vs != -1 { // If there is GET token param
+				if alias, ok := tokenAliases[string(token)]; ok {
+					// Rewrite original token to alias
+					payload = proto.SetPathParam(payload, []byte("token"), alias)
+
+					// Copy modified payload to our buffer
+					buf = append(buf[:headerSize], payload...)
+				}
+			}
+		}
+
+		// Emitting data back
+		os.Stdout.Write(encode(buf))
+	case '2': // Original response
+		if _, ok := originalTokens[reqID]; ok {
+			// Token is inside response body
+			secureToken := proto.Body(payload)
+			originalTokens[reqID] = secureToken
+			Debug("Remember origial token:", string(secureToken))
+		}
+	case '3': // Replayed response
+		if originalToken, ok := originalTokens[reqID]; ok {
+			delete(originalTokens, reqID)
+			secureToken := proto.Body(payload)
+			tokenAliases[string(originalToken)] = secureToken
+
+			Debug("Create alias for new token token, was:", string(originalToken), "now:", string(secureToken))
+		}
+	}
+}
+
+func encode(buf []byte) []byte {
+	dst := make([]byte, len(buf)*2+1)
+	hex.Encode(dst, buf)
+	dst[len(dst)-1] = '\n'
+
+	return dst
+}
+
+func Debug(args ...interface{}) {
+	if os.Getenv("GOR_TEST") == "" { // if we are not testing
+		fmt.Fprint(os.Stderr, "[DEBUG][TOKEN-MOD] ")
+		fmt.Fprintln(os.Stderr, args...)
+	}
+}

go.mod

@@ -0,0 +1,21 @@
+module github.com/buger/goreplay
+
+go 1.14
+
+require (
+	github.com/Shopify/sarama v1.26.4
+	github.com/araddon/gou v0.0.0-20190110011759-c797efecbb61 // indirect
+	github.com/aws/aws-sdk-go v1.33.2
+	github.com/bitly/go-hostpool v0.1.0 // indirect
+	github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 // indirect
+	github.com/google/gopacket v1.1.18
+	github.com/klauspost/compress v1.10.10 // indirect
+	github.com/mattbaird/elastigo v0.0.0-20170123220020-2fe47fd29e4b
+	github.com/pbnjay/memory v0.0.0-20201129165224-b12e5d931931
+	github.com/pierrec/lz4 v2.5.2+incompatible // indirect
+	github.com/rcrowley/go-metrics v0.0.0-20200313005456-10cdbea86bc0 // indirect
+	github.com/smartystreets/goconvey v1.6.4 // indirect
+	github.com/stretchr/testify v1.5.1
+	golang.org/x/net v0.0.0-20200707034311-ab3426394381 // indirect
+	golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd
+)

go.sum

@@ -0,0 +1,112 @@
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+github.com/araddon/gou v0.0.0-20190110011759-c797efecbb61/go.mod h1:ikc1XA58M+Rx7SEbf0bLJCfBkwayZ8T5jBo5FXK8Uz8=
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gor.go

@@ -4,36 +4,57 @@ package main
 
 import (
 	"flag"
-	"fmt"
 	"log"
+	"net/http"
+	"net/http/httputil"
+	_ "net/http/pprof"
 	"os"
-	"runtime/debug"
+	"os/signal"
+	"runtime"
+	_ "runtime/debug"
 	"runtime/pprof"
+	"syscall"
 	"time"
 )
 
 var (
-	mode       string
 	cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
 	memprofile = flag.String("memprofile", "", "write memory profile to this file")
 )
 
+func loggingMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		rb, _ := httputil.DumpRequest(r, false)
+		log.Println(string(rb))
+		next.ServeHTTP(w, r)
+	})
+}
+
 func main() {
-	// Don't exit on panic
-	defer func() {
-		if r := recover(); r != nil {
-			if _, ok := r.(error); !ok {
-				fmt.Printf("PANIC: pkg: %v %s \n", r, debug.Stack())
-			}
+	if os.Getenv("GOMAXPROCS") == "" {
+		runtime.GOMAXPROCS(runtime.NumCPU() * 2)
+	}
+
+	args := os.Args[1:]
+	var plugins *InOutPlugins
+	if len(args) > 0 && args[0] == "file-server" {
+		if len(args) != 2 {
+			log.Fatal("You should specify port and IP (optional) for the file server. Example: `gor file-server :80`")
 		}
-	}()
+		dir, _ := os.Getwd()
 
-	fmt.Println("Version:", VERSION)
+		Debug(0, "Started example file server for current directory on address ", args[1])
 
-	flag.Parse()
-	InitPlugins()
+		log.Fatal(http.ListenAndServe(args[1], loggingMiddleware(http.FileServer(http.Dir(dir)))))
+	} else {
+		flag.Parse()
+		checkSettings()
+		plugins = NewPlugins()
+	}
 
-	if len(Plugins.Inputs) == 0 || len(Plugins.Outputs) == 0 {
+	log.Printf("[PPID %d and PID %d] Version:%s\n", os.Getppid(), os.Getpid(), VERSION)
+
+	if len(plugins.Inputs) == 0 || len(plugins.Outputs) == 0 {
 		log.Fatal("Required at least 1 input and 1 output")
 	}
 
@@ -45,7 +66,34 @@ func main() {
 		profileCPU(*cpuprofile)
 	}
 
-	Start(nil)
+	if Settings.Pprof != "" {
+		go func() {
+			log.Println(http.ListenAndServe(Settings.Pprof, nil))
+		}()
+	}
+
+	closeCh := make(chan int)
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
+	if Settings.ExitAfter > 0 {
+		log.Printf("Running gor for a duration of %s\n", Settings.ExitAfter)
+
+		time.AfterFunc(Settings.ExitAfter, func() {
+			log.Printf("gor run timeout %s\n", Settings.ExitAfter)
+			close(closeCh)
+		})
+	}
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+	exit := 0
+	select {
+	case <-c:
+		exit = 1
+	case <-closeCh:
+		exit = 0
+	}
+	emitter.Close()
+	os.Exit(exit)
 }
 
 func profileCPU(cpuprofile string) {
@@ -56,10 +104,9 @@ func profileCPU(cpuprofile string) {
 		}
 		pprof.StartCPUProfile(f)
 
-		time.AfterFunc(60*time.Second, func() {
+		time.AfterFunc(30*time.Second, func() {
 			pprof.StopCPUProfile()
 			f.Close()
-			log.Println("Stop profiling after 60 seconds")
 		})
 	}
 }
@@ -70,7 +117,7 @@ func profileMEM(memprofile string) {
 		if err != nil {
 			log.Fatal(err)
 		}
-		time.AfterFunc(60*time.Second, func() {
+		time.AfterFunc(30*time.Second, func() {
 			pprof.WriteHeapProfile(f)
 			f.Close()
 		})

gor_stat.go

@@ -1,45 +1,42 @@
 package main
 
 import (
-	"time"
-	"log"
+	"runtime"
 	"strconv"
-)
-
-const (
-	rate = 5
+	"time"
 )
 
 type GorStat struct {
-	statName	string
-	latest		int
-	mean	 	int
-	max			int
-	count		int
+	statName string
+	rateMs   int
+	latest   int
+	mean     int
+	max      int
+	count    int
 }
 
-func NewGorStat(statName string) (s *GorStat) {
+func NewGorStat(statName string, rateMs int) (s *GorStat) {
 	s = new(GorStat)
 	s.statName = statName
+	s.rateMs = rateMs
 	s.latest = 0
 	s.mean = 0
 	s.max = 0
 	s.count = 0
 
-	if Settings.stats {
-		log.Println(s.statName + ":latest,mean,max,count,count/second")
+	if Settings.Stats {
 		go s.reportStats()
 	}
 	return
 }
 
 func (s *GorStat) Write(latest int) {
-	if Settings.stats {
+	if Settings.Stats {
 		if latest > s.max {
 			s.max = latest
 		}
 		if latest != 0 {
-			s.mean = (s.mean + latest) / 2
+			s.mean = ((s.mean * s.count) + latest) / (s.count + 1)
 		}
 		s.latest = latest
 		s.count = s.count + 1
@@ -54,14 +51,14 @@ func (s *GorStat) Reset() {
 }
 
 func (s *GorStat) String() string {
-	return s.statName + ":" + strconv.Itoa(s.latest) + "," + strconv.Itoa(s.mean) + "," + strconv.Itoa(s.max) + "," + strconv.Itoa(s.count) + "," + strconv.Itoa(s.count / rate)
+	return s.statName + ":" + strconv.Itoa(s.latest) + "," + strconv.Itoa(s.mean) + "," + strconv.Itoa(s.max) + "," + strconv.Itoa(s.count) + "," + strconv.Itoa(s.count/(s.rateMs/1000.0)) + "," + strconv.Itoa(runtime.NumGoroutine())
 }
 
 func (s *GorStat) reportStats() {
+	Debug(0, "\n", s.statName+":latest,mean,max,count,count/second,gcount")
 	for {
-			log.Println(s)
-			s.Reset()
-			time.Sleep(rate * time.Second)
+		Debug(0, "\n", s)
+		s.Reset()
+		time.Sleep(time.Duration(s.rateMs) * time.Millisecond)
 	}
 }
-

homebrew/gor.rb

@@ -0,0 +1,46 @@
+require "language/go"
+
+class Gor < Formula
+  desc "Real-time HTTP traffic replay tool written in Go"
+  homepage "https://gortool.com"
+  url "https://github.com/buger/gor/archive/v0.14.0.tar.gz"
+  sha256 "62260a6f5cabde571b91d5762fba9c47691643df0a58565cbe808854cd064dc8"
+  head "https://github.com/buger/gor.git"
+
+  bottle do
+    cellar :any_skip_relocation
+    sha256 "c382403de70a41b7445920a02051f5e82030704aaaae70cfcd4e8f401cc87f6a" => :el_capitan
+    sha256 "4b76b3785584897800e87967f1af9510208faefe46f57d7bd6f8b40a7133c19b" => :yosemite
+    sha256 "d186cb1566d33ab8f78215e69934f49dd96becb1c236905b4502d94399ae1974" => :mavericks
+  end
+
+  depends_on "go" => :build
+
+  go_resource "github.com/bitly/go-hostpool" do
+    url "https://github.com/bitly/go-hostpool.git",
+      :revision => "d0e59c22a56e8dadfed24f74f452cea5a52722d2"
+  end
+
+  go_resource "github.com/buger/elastigo" do
+    url "https://github.com/buger/elastigo.git",
+      :revision => "23fcfd9db0d8be2189a98fdab77a4c90fcc3a1e9"
+  end
+
+  go_resource "github.com/google/gopacket" do
+    url "https://github.com/google/gopacket.git",
+      :revision => "aa09ced736460d76535444c825932a0742975f7d"
+  end
+
+  def install
+    ENV["GOPATH"] = buildpath
+    mkdir_p buildpath/"src/github.com/buger/"
+    ln_sf buildpath, buildpath/"src/github.com/buger/gor"
+    Language::Go.stage_deps resources, buildpath/"src"
+
+    system "go", "build", "-o", "#{bin}/gor", "-ldflags", "-X main.VERSION \"#{version}\""
+  end
+
+  test do
+    assert_match version.to_s, shell_output("#{bin}/gor", 1)
+  end
+end

http_modifier.go

@@ -0,0 +1,196 @@
+package main
+
+import (
+	"bytes"
+	"encoding/base64"
+	"hash/fnv"
+	"strings"
+
+	"github.com/buger/goreplay/proto"
+)
+
+type HTTPModifier struct {
+	config *HTTPModifierConfig
+}
+
+func NewHTTPModifier(config *HTTPModifierConfig) *HTTPModifier {
+	// Optimization to skip modifier completely if we do not need it
+	if len(config.URLRegexp) == 0 &&
+		len(config.URLNegativeRegexp) == 0 &&
+		len(config.URLRewrite) == 0 &&
+		len(config.HeaderRewrite) == 0 &&
+		len(config.HeaderFilters) == 0 &&
+		len(config.HeaderNegativeFilters) == 0 &&
+		len(config.HeaderBasicAuthFilters) == 0 &&
+		len(config.HeaderHashFilters) == 0 &&
+		len(config.ParamHashFilters) == 0 &&
+		len(config.Params) == 0 &&
+		len(config.Headers) == 0 &&
+		len(config.Methods) == 0 {
+		return nil
+	}
+
+	return &HTTPModifier{config: config}
+}
+
+func (m *HTTPModifier) Rewrite(payload []byte) (response []byte) {
+	if !proto.HasRequestTitle(payload) {
+		return payload
+	}
+
+	if len(m.config.Methods) > 0 {
+		method := proto.Method(payload)
+
+		matched := false
+
+		for _, m := range m.config.Methods {
+			if bytes.Equal(method, m) {
+				matched = true
+				break
+			}
+		}
+
+		if !matched {
+			return
+		}
+	}
+
+	if len(m.config.Headers) > 0 {
+		for _, header := range m.config.Headers {
+			payload = proto.SetHeader(payload, []byte(header.Name), []byte(header.Value))
+		}
+	}
+
+	if len(m.config.Params) > 0 {
+		for _, param := range m.config.Params {
+			payload = proto.SetPathParam(payload, param.Name, param.Value)
+		}
+	}
+
+	if len(m.config.URLRegexp) > 0 {
+		path := proto.Path(payload)
+
+		matched := false
+
+		for _, f := range m.config.URLRegexp {
+			if f.regexp.Match(path) {
+				matched = true
+				break
+			}
+		}
+
+		if !matched {
+			return
+		}
+	}
+
+	if len(m.config.URLNegativeRegexp) > 0 {
+		path := proto.Path(payload)
+
+		for _, f := range m.config.URLNegativeRegexp {
+			if f.regexp.Match(path) {
+				return
+			}
+		}
+	}
+
+	if len(m.config.HeaderFilters) > 0 {
+		for _, f := range m.config.HeaderFilters {
+			value := proto.Header(payload, f.name)
+
+			if len(value) == 0 {
+				return
+			}
+
+			if !f.regexp.Match(value) {
+				return
+			}
+		}
+	}
+
+	if len(m.config.HeaderNegativeFilters) > 0 {
+		for _, f := range m.config.HeaderNegativeFilters {
+			value := proto.Header(payload, f.name)
+
+			if len(value) > 0 && f.regexp.Match(value) {
+				return
+			}
+		}
+	}
+
+	if len(m.config.HeaderBasicAuthFilters) > 0 {
+		for _, f := range m.config.HeaderBasicAuthFilters {
+			value := proto.Header(payload, []byte("Authorization"))
+
+			if len(value) > 0 {
+				valueString := string(value)
+				trimmedBasicAuthEncoded := strings.TrimPrefix(valueString, "Basic ")
+				if strings.Compare(valueString, trimmedBasicAuthEncoded) != 0 {
+					decodedAuth, _ := base64.StdEncoding.DecodeString(trimmedBasicAuthEncoded)
+					if !f.regexp.Match(decodedAuth) {
+						return
+					}
+				}
+			}
+		}
+	}
+
+	if len(m.config.HeaderHashFilters) > 0 {
+		for _, f := range m.config.HeaderHashFilters {
+			value := proto.Header(payload, f.name)
+
+			if len(value) > 0 {
+				hasher := fnv.New32a()
+				hasher.Write(value)
+
+				if (hasher.Sum32() % 100) >= f.percent {
+					return
+				}
+			}
+		}
+	}
+
+	if len(m.config.ParamHashFilters) > 0 {
+		for _, f := range m.config.ParamHashFilters {
+			value, s, _ := proto.PathParam(payload, f.name)
+
+			if s != -1 {
+				hasher := fnv.New32a()
+				hasher.Write(value)
+
+				if (hasher.Sum32() % 100) >= f.percent {
+					return
+				}
+			}
+		}
+	}
+
+	if len(m.config.URLRewrite) > 0 {
+		path := proto.Path(payload)
+
+		for _, f := range m.config.URLRewrite {
+			if f.src.Match(path) {
+				path = f.src.ReplaceAll(path, f.target)
+				payload = proto.SetPath(payload, path)
+
+				break
+			}
+		}
+	}
+
+	if len(m.config.HeaderRewrite) > 0 {
+		for _, f := range m.config.HeaderRewrite {
+			value := proto.Header(payload, f.header)
+			if len(value) == 0 {
+				break
+			}
+
+			if f.src.Match(value) {
+				newValue := f.src.ReplaceAll(value, f.target)
+				payload = proto.SetHeader(payload, f.header, newValue)
+			}
+		}
+	}
+
+	return payload
+}

http_modifier_settings.go

@@ -0,0 +1,299 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// HTTPModifierConfig holds configuration options for built-in traffic modifier
+type HTTPModifierConfig struct {
+	URLNegativeRegexp      HTTPURLRegexp              `json:"http-disallow-url"`
+	URLRegexp              HTTPURLRegexp              `json:"http-allow-url"`
+	URLRewrite             URLRewriteMap              `json:"http-rewrite-url"`
+	HeaderRewrite          HeaderRewriteMap           `json:"http-rewrite-header"`
+	HeaderFilters          HTTPHeaderFilters          `json:"http-allow-header"`
+	HeaderNegativeFilters  HTTPHeaderFilters          `json:"http-disallow-header"`
+	HeaderBasicAuthFilters HTTPHeaderBasicAuthFilters `json:"http-basic-auth-filter"`
+	HeaderHashFilters      HTTPHashFilters            `json:"http-header-limiter"`
+	ParamHashFilters       HTTPHashFilters            `json:"http-param-limiter"`
+	Params                 HTTPParams                 `json:"http-set-param"`
+	Headers                HTTPHeaders                `json:"http-set-header"`
+	Methods                HTTPMethods                `json:"http-allow-method"`
+}
+
+//
+// Handling of --http-allow-header, --http-disallow-header options
+//
+type headerFilter struct {
+	name   []byte
+	regexp *regexp.Regexp
+}
+
+// HTTPHeaderFilters holds list of headers and their regexps
+type HTTPHeaderFilters []headerFilter
+
+func (h *HTTPHeaderFilters) String() string {
+	return fmt.Sprint(*h)
+}
+
+// Set method to implement flags.Value
+func (h *HTTPHeaderFilters) Set(value string) error {
+	valArr := strings.SplitN(value, ":", 2)
+	if len(valArr) < 2 {
+		return errors.New("need both header and value, colon-delimited (ex. user_id:^169$)")
+	}
+	val := strings.TrimSpace(valArr[1])
+	r, err := regexp.Compile(val)
+	if err != nil {
+		return err
+	}
+
+	*h = append(*h, headerFilter{name: []byte(valArr[0]), regexp: r})
+
+	return nil
+}
+
+//
+// Handling of --http-basic-auth-filter option
+//
+type basicAuthFilter struct {
+	regexp *regexp.Regexp
+}
+
+// HTTPHeaderBasicAuthFilters holds list of regxp to match basic Auth header values
+type HTTPHeaderBasicAuthFilters []basicAuthFilter
+
+func (h *HTTPHeaderBasicAuthFilters) String() string {
+	return fmt.Sprint(*h)
+}
+
+// Set method to implement flags.Value
+func (h *HTTPHeaderBasicAuthFilters) Set(value string) error {
+	r, err := regexp.Compile(value)
+	if err != nil {
+		return err
+	}
+
+	*h = append(*h, basicAuthFilter{regexp: r})
+
+	return nil
+}
+
+//
+// Handling of --http-allow-header-hash and --http-allow-param-hash options
+//
+type hashFilter struct {
+	name    []byte
+	percent uint32
+}
+
+// HTTPHashFilters represents a slice of header hash filters
+type HTTPHashFilters []hashFilter
+
+func (h *HTTPHashFilters) String() string {
+	return fmt.Sprint(*h)
+}
+
+// Set method to implement flags.Value
+func (h *HTTPHashFilters) Set(value string) error {
+	valArr := strings.SplitN(value, ":", 2)
+	if len(valArr) < 2 {
+		return errors.New("need both header and value, colon-delimited (ex. user_id:50%)")
+	}
+
+	f := hashFilter{name: []byte(valArr[0])}
+
+	val := strings.TrimSpace(valArr[1])
+
+	if strings.Contains(val, "%") {
+		p, _ := strconv.ParseInt(val[:len(val)-1], 0, 0)
+		f.percent = uint32(p)
+	} else if strings.Contains(val, "/") {
+		// DEPRECATED format
+		var num, den uint64
+
+		fracArr := strings.Split(val, "/")
+		num, _ = strconv.ParseUint(fracArr[0], 10, 64)
+		den, _ = strconv.ParseUint(fracArr[1], 10, 64)
+
+		f.percent = uint32((float64(num) / float64(den)) * 100)
+	} else {
+		return errors.New("Value should be percent and contain '%'")
+	}
+
+	*h = append(*h, f)
+
+	return nil
+}
+
+//
+// Handling of --http-set-header option
+//
+type httpHeader struct {
+	Name  string
+	Value string
+}
+
+// HTTPHeaders is a slice of headers that must appended
+type HTTPHeaders []httpHeader
+
+func (h *HTTPHeaders) String() string {
+	return fmt.Sprint(*h)
+}
+
+// Set method to implement flags.Value
+func (h *HTTPHeaders) Set(value string) error {
+	v := strings.SplitN(value, ":", 2)
+	if len(v) != 2 {
+		return errors.New("Expected `Key: Value`")
+	}
+
+	header := httpHeader{
+		strings.TrimSpace(v[0]),
+		strings.TrimSpace(v[1]),
+	}
+
+	*h = append(*h, header)
+	return nil
+}
+
+//
+// Handling of --http-set-param option
+//
+type httpParam struct {
+	Name  []byte
+	Value []byte
+}
+
+// HTTPParams filters for --http-set-param
+type HTTPParams []httpParam
+
+func (h *HTTPParams) String() string {
+	return fmt.Sprint(*h)
+}
+
+// Set method to implement flags.Value
+func (h *HTTPParams) Set(value string) error {
+	v := strings.SplitN(value, "=", 2)
+	if len(v) != 2 {
+		return errors.New("Expected `Key=Value`")
+	}
+
+	param := httpParam{
+		[]byte(strings.TrimSpace(v[0])),
+		[]byte(strings.TrimSpace(v[1])),
+	}
+
+	*h = append(*h, param)
+	return nil
+}
+
+//
+// Handling of --http-allow-method option
+//
+
+// HTTPMethods holds values for method allowed
+type HTTPMethods [][]byte
+
+func (h *HTTPMethods) String() string {
+	return fmt.Sprint(*h)
+}
+
+// Set method to implement flags.Value
+func (h *HTTPMethods) Set(value string) error {
+	*h = append(*h, []byte(value))
+	return nil
+}
+
+//
+// Handling of --http-rewrite-url option
+//
+type urlRewrite struct {
+	src    *regexp.Regexp
+	target []byte
+}
+
+// URLRewriteMap holds regexp and data to modify URL
+type URLRewriteMap []urlRewrite
+
+func (r *URLRewriteMap) String() string {
+	return fmt.Sprint(*r)
+}
+
+// Set method to implement flags.Value
+func (r *URLRewriteMap) Set(value string) error {
+	valArr := strings.SplitN(value, ":", 2)
+	if len(valArr) < 2 {
+		return errors.New("need both src and target, colon-delimited (ex. /a:/b)")
+	}
+	regexp, err := regexp.Compile(valArr[0])
+	if err != nil {
+		return err
+	}
+	*r = append(*r, urlRewrite{src: regexp, target: []byte(valArr[1])})
+	return nil
+}
+
+//
+// Handling of --http-rewrite-header option
+//
+type headerRewrite struct {
+	header []byte
+	src    *regexp.Regexp
+	target []byte
+}
+
+// HeaderRewriteMap holds regexp and data to rewrite headers
+type HeaderRewriteMap []headerRewrite
+
+func (r *HeaderRewriteMap) String() string {
+	return fmt.Sprint(*r)
+}
+
+// Set method to implement flags.Value
+func (r *HeaderRewriteMap) Set(value string) error {
+	headerArr := strings.SplitN(value, ":", 2)
+	if len(headerArr) < 2 {
+		return errors.New("need both header, regexp and rewrite target, colon-delimited (ex. Header: regexp,target)")
+	}
+
+	header := headerArr[0]
+	valArr := strings.SplitN(strings.TrimSpace(headerArr[1]), ",", 2)
+
+	if len(valArr) < 2 {
+		return errors.New("need both header, regexp and rewrite target, colon-delimited (ex. Header: regexp,target)")
+	}
+
+	regexp, err := regexp.Compile(valArr[0])
+	if err != nil {
+		return err
+	}
+	*r = append(*r, headerRewrite{header: []byte(header), src: regexp, target: []byte(valArr[1])})
+	return nil
+}
+
+//
+// Handling of --http-allow-url option
+//
+type urlRegexp struct {
+	regexp *regexp.Regexp
+}
+
+// HTTPURLRegexp a slice of regexp to match URLs
+type HTTPURLRegexp []urlRegexp
+
+func (r *HTTPURLRegexp) String() string {
+	return fmt.Sprint(*r)
+}
+
+// Set method to implement flags.Value
+func (r *HTTPURLRegexp) Set(value string) error {
+	regexp, err := regexp.Compile(value)
+
+	*r = append(*r, urlRegexp{regexp: regexp})
+
+	return err
+}

http_modifier_settings_test.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"testing"
+)
+
+func TestHTTPHeaderFilters(t *testing.T) {
+	filters := HTTPHeaderFilters{}
+
+	err := filters.Set("Header1:^$")
+	if err != nil {
+		t.Error("Should not error on Header1:^$")
+	}
+
+	err = filters.Set("Header2:^:$")
+	if err != nil {
+		t.Error("Should not error on Header2:^:$")
+	}
+
+	// Missing colon
+	err = filters.Set("Header3-^$")
+	if err == nil {
+		t.Error("Should error on Header2:^:$")
+	}
+}
+
+func TestHTTPHashFilters(t *testing.T) {
+	filters := HTTPHashFilters{}
+
+	err := filters.Set("Header1:1/2")
+	if err != nil {
+		t.Error("Should support old syntax")
+	}
+
+	if filters[0].percent != 50 {
+		t.Error("Wrong percentage", filters[0].percent)
+	}
+
+	err = filters.Set("Header2:1")
+	if err == nil {
+		t.Error("Should error on Header2 because no % symbol")
+	}
+
+	err = filters.Set("Header2:10%")
+	if err != nil {
+		t.Error("Should pass")
+	}
+
+	if filters[1].percent != 10 {
+		t.Error("Wrong percentage", filters[1].percent)
+	}
+}
+
+func TestUrlRewriteMap(t *testing.T) {
+	var err error
+	rewrites := URLRewriteMap{}
+
+	if err = rewrites.Set("/v1/user/([^\\/]+)/ping:/v2/user/$1/ping"); err != nil {
+		t.Error("Should set mapping", err)
+	}
+
+	if err = rewrites.Set("/v1/user/([^\\/]+)/ping"); err == nil {
+		t.Error("Should not set mapping without :")
+	}
+}

http_modifier_test.go

@@ -0,0 +1,320 @@
+package main
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/buger/goreplay/proto"
+)
+
+func TestHTTPModifierWithoutConfig(t *testing.T) {
+	if NewHTTPModifier(&HTTPModifierConfig{}) != nil {
+		t.Error("If no config specified should not be initialized")
+	}
+}
+
+func TestHTTPModifierHeaderFilters(t *testing.T) {
+	filters := HTTPHeaderFilters{}
+	filters.Set("Host:^www.w3.org$")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		HeaderFilters: filters,
+	})
+
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if len(modifier.Rewrite(payload)) == 0 {
+		t.Error("Request should pass filters")
+	}
+
+	filters = HTTPHeaderFilters{}
+	// Setting filter that not match our header
+	filters.Set("Host:^www.w4.org$")
+
+	modifier = NewHTTPModifier(&HTTPModifierConfig{
+		HeaderFilters: filters,
+	})
+
+	if len(modifier.Rewrite(payload)) != 0 {
+		t.Error("Request should not pass filters")
+	}
+}
+
+func TestHTTPModifierHeaderNegativeFilters(t *testing.T) {
+	filters := HTTPHeaderFilters{}
+	filters.Set("Host:^www.w3.org$")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		HeaderNegativeFilters: filters,
+	})
+
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w4.org\r\n\r\na=1&b=2")
+
+	if len(modifier.Rewrite(payload)) == 0 {
+		t.Error("Request should pass filters")
+	}
+
+	filters = HTTPHeaderFilters{}
+	// Setting filter that not match our header
+	filters.Set("Host:^www.w4.org$")
+
+	modifier = NewHTTPModifier(&HTTPModifierConfig{
+		HeaderNegativeFilters: filters,
+	})
+
+	if len(modifier.Rewrite(payload)) != 0 {
+		t.Error("Request should not pass filters")
+	}
+
+	filters = HTTPHeaderFilters{}
+	// Setting filter that not match our header
+	filters.Set("Host: www*")
+
+	modifier = NewHTTPModifier(&HTTPModifierConfig{
+		HeaderNegativeFilters: filters,
+	})
+
+	if len(modifier.Rewrite(payload)) != 0 {
+		t.Error("Request should not pass filters")
+	}
+}
+
+func TestHTTPHeaderBasicAuthFilters(t *testing.T) {
+	filters := HTTPHeaderBasicAuthFilters{}
+	filters.Set("^customer[0-9].*")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		HeaderBasicAuthFilters: filters,
+	})
+
+	//Encoded UserId:Password = customer3:welcome
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nAuthorization: Basic Y3VzdG9tZXIzOndlbGNvbWU=\r\n\r\na=1&b=2")
+	if len(modifier.Rewrite(payload)) == 0 {
+		t.Error("Request should pass filters")
+	}
+
+	//customer6:rest@123^TEST
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 88\r\nAuthorization: Basic Y3VzdG9tZXI2OnJlc3RAMTIzXlRFU1Q==\r\n\r\na=1&b=2")
+	if len(modifier.Rewrite(payload)) == 0 {
+		t.Error("Request should pass filters")
+	}
+
+	filters = HTTPHeaderBasicAuthFilters{}
+	// Setting filter that not match our header
+	filters.Set("^(homer simpson|mickey mouse).*")
+
+	modifier = NewHTTPModifier(&HTTPModifierConfig{
+		HeaderBasicAuthFilters: filters,
+	})
+
+	if len(modifier.Rewrite(payload)) != 0 {
+		t.Error("Request should not pass filters")
+	}
+
+	//mickey mouse:happy123
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 88\r\nAuthorization: Basic bWlja2V5IG1vdXNlOmhhcHB5MTIz\r\n\r\na=1&b=2")
+	if len(modifier.Rewrite(payload)) == 0 {
+		t.Error("Request should pass filters")
+	}
+}
+
+func TestHTTPModifierURLRewrite(t *testing.T) {
+	var url, newURL []byte
+
+	rewrites := URLRewriteMap{}
+
+	payload := func(url []byte) []byte {
+		return []byte("POST " + string(url) + " HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	}
+
+	err := rewrites.Set("/v1/user/([^\\/]+)/ping:/v2/user/$1/ping")
+	if err != nil {
+		t.Error("Should not error on /v1/user/([^\\/]+)/ping:/v2/user/$1/ping")
+	}
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		URLRewrite: rewrites,
+	})
+
+	url = []byte("/v1/user/joe/ping")
+	if newURL = proto.Path(modifier.Rewrite(payload(url))); bytes.Equal(newURL, url) {
+		t.Error("Request url should have been rewritten, wasn't", string(newURL))
+	}
+
+	url = []byte("/v1/user/ping")
+	if newURL = proto.Path(modifier.Rewrite(payload(url))); !bytes.Equal(newURL, url) {
+		t.Error("Request url should have been rewritten, wasn't", string(newURL))
+	}
+}
+
+func TestHTTPModifierHeaderRewrite(t *testing.T) {
+	var header, newHeader []byte
+
+	rewrites := HeaderRewriteMap{}
+	payload := []byte("GET / HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	err := rewrites.Set("Host: (.*).w3.org,$1.beta.w3.org")
+	if err != nil {
+		t.Error("Should not error", err)
+	}
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		HeaderRewrite: rewrites,
+	})
+
+	header = []byte("www.beta.w3.org")
+	if newHeader = proto.Header(modifier.Rewrite(payload), []byte("Host")); !bytes.Equal(newHeader, header) {
+		t.Error("Request header should have been rewritten, wasn't", string(newHeader), string(header))
+	}
+}
+
+func TestHTTPModifierHeaderHashFilters(t *testing.T) {
+	filters := HTTPHashFilters{}
+	filters.Set("Header2:1/2")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		HeaderHashFilters: filters,
+	})
+
+	payload := func(header []byte) []byte {
+		return []byte("POST / HTTP/1.1\r\n" + string(header) + "Content-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	}
+
+	if p := modifier.Rewrite(payload([]byte(""))); len(p) == 0 {
+		t.Error("Request should pass filters if Header does not exist")
+	}
+
+	if p := modifier.Rewrite(payload([]byte("Header2: 3\r\n"))); len(p) > 0 {
+		t.Error("Request should not pass filters, Header2 hash too high")
+	}
+
+	if p := modifier.Rewrite(payload([]byte("Header2: 1\r\n"))); len(p) == 0 {
+		t.Error("Request should pass filters")
+	}
+}
+
+func TestHTTPModifierParamHashFilters(t *testing.T) {
+	filters := HTTPHashFilters{}
+	filters.Set("user_id:1/2")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		ParamHashFilters: filters,
+	})
+
+	payload := func(value []byte) []byte {
+		return []byte("POST /" + string(value) + " HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	}
+
+	if p := modifier.Rewrite(payload([]byte(""))); len(p) == 0 {
+		t.Error("Request should pass filters if param does not exist")
+	}
+
+	if p := modifier.Rewrite(payload([]byte("?user_id=3"))); len(p) > 0 {
+		t.Error("Request should not pass filters", string(p))
+	}
+
+	if p := modifier.Rewrite(payload([]byte("?user_id=1"))); len(p) == 0 {
+		t.Error("Request should pass filters")
+	}
+}
+
+func TestHTTPModifierHeaders(t *testing.T) {
+	headers := HTTPHeaders{}
+	headers.Set("Header1:1")
+	headers.Set("Host:localhost")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		Headers: headers,
+	})
+
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	newPayload := []byte("POST /post HTTP/1.1\r\nHeader1: 1\r\nContent-Length: 7\r\nHost: localhost\r\n\r\na=1&b=2")
+
+	if payload = modifier.Rewrite(payload); !bytes.Equal(payload, newPayload) {
+		t.Error("Should update request headers", string(payload))
+	}
+}
+
+func TestHTTPModifierURLRegexp(t *testing.T) {
+	filters := HTTPURLRegexp{}
+	filters.Set("/v1/app")
+	filters.Set("/v1/api")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		URLRegexp: filters,
+	})
+
+	payload := func(url string) []byte {
+		return []byte("POST " + url + " HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	}
+
+	if len(modifier.Rewrite(payload("/v1/app/test"))) == 0 {
+		t.Error("Should pass url")
+	}
+
+	if len(modifier.Rewrite(payload("/v1/api/test"))) == 0 {
+		t.Error("Should pass url")
+	}
+
+	if len(modifier.Rewrite(payload("/other"))) > 0 {
+		t.Error("Should not pass url")
+	}
+}
+
+func TestHTTPModifierURLNegativeRegexp(t *testing.T) {
+	filters := HTTPURLRegexp{}
+	filters.Set("/restricted1")
+	filters.Set("/some/restricted2")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		URLNegativeRegexp: filters,
+	})
+
+	payload := func(url string) []byte {
+		return []byte("POST " + url + " HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	}
+
+	if len(modifier.Rewrite(payload("/v1/app/test"))) == 0 {
+		t.Error("Should pass url")
+	}
+
+	if len(modifier.Rewrite(payload("/restricted1"))) > 0 {
+		t.Error("Should not pass url")
+	}
+
+	if len(modifier.Rewrite(payload("/some/restricted2"))) > 0 {
+		t.Error("Should not pass url")
+	}
+}
+
+func TestHTTPModifierSetHeader(t *testing.T) {
+	filters := HTTPHeaders{}
+	filters.Set("User-Agent:Gor")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		Headers: filters,
+	})
+
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter := []byte("POST /post HTTP/1.1\r\nUser-Agent: Gor\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = modifier.Rewrite(payload); !bytes.Equal(payloadAfter, payload) {
+		t.Error("Should add new header", string(payload))
+	}
+}
+
+func TestHTTPModifierSetParam(t *testing.T) {
+	filters := HTTPParams{}
+	filters.Set("api_key=1")
+
+	modifier := NewHTTPModifier(&HTTPModifierConfig{
+		Params: filters,
+	})
+
+	payload := []byte("POST /post?api_key=1234 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter := []byte("POST /post?api_key=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = modifier.Rewrite(payload); !bytes.Equal(payloadAfter, payload) {
+		t.Error("Should override param", string(payload))
+	}
+}

http_prettifier.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"bytes"
+	"compress/gzip"
+	"fmt"
+	"io/ioutil"
+	"net/http/httputil"
+	"strconv"
+
+	"github.com/buger/goreplay/proto"
+)
+
+func prettifyHTTP(p []byte) []byte {
+
+	tEnc := bytes.Equal(proto.Header(p, []byte("Transfer-Encoding")), []byte("chunked"))
+	cEnc := bytes.Equal(proto.Header(p, []byte("Content-Encoding")), []byte("gzip"))
+
+	if !(tEnc || cEnc) {
+		return p
+	}
+
+	headersPos := proto.MIMEHeadersEndPos(p)
+
+	if headersPos < 5 || headersPos > len(p) {
+		return p
+	}
+
+	headers := p[:headersPos]
+	content := p[headersPos:]
+
+	if tEnc {
+		buf := bytes.NewReader(content)
+		r := httputil.NewChunkedReader(buf)
+		content, _ = ioutil.ReadAll(r)
+
+		headers = proto.DeleteHeader(headers, []byte("Transfer-Encoding"))
+
+		newLen := strconv.Itoa(len(content))
+		headers = proto.SetHeader(headers, []byte("Content-Length"), []byte(newLen))
+	}
+
+	if cEnc {
+		buf := bytes.NewReader(content)
+		g, err := gzip.NewReader(buf)
+
+		if err != nil {
+			Debug(1, "[Prettifier] GZIP encoding error:", err)
+			return []byte{}
+		}
+
+		content, err = ioutil.ReadAll(g)
+		if err != nil {
+			Debug(1, fmt.Sprintf("[HTTP-PRETTIFIER] %q", err))
+			return p
+		}
+
+		headers = proto.DeleteHeader(headers, []byte("Content-Encoding"))
+
+		newLen := strconv.Itoa(len(content))
+		headers = proto.SetHeader(headers, []byte("Content-Length"), []byte(newLen))
+	}
+
+	newPayload := append(headers, content...)
+
+	return newPayload
+}

http_prettifier_test.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"bytes"
+	"compress/gzip"
+	"strconv"
+	"testing"
+
+	"github.com/buger/goreplay/proto"
+)
+
+func TestHTTPPrettifierGzip(t *testing.T) {
+	b := bytes.NewBufferString("")
+	w := gzip.NewWriter(b)
+	w.Write([]byte("test"))
+	w.Close()
+
+	size := strconv.Itoa(len(b.Bytes()))
+
+	payload := []byte("HTTP/1.1 200 OK\r\nContent-Length: " + size + "\r\nContent-Encoding: gzip\r\n\r\n")
+	payload = append(payload, b.Bytes()...)
+
+	newPayload := prettifyHTTP(payload)
+
+	if string(newPayload) != "HTTP/1.1 200 OK\r\nContent-Length: 4\r\n\r\ntest" {
+		t.Errorf("Payload not match %q", string(newPayload))
+	}
+}
+
+func TestHTTPPrettifierChunked(t *testing.T) {
+	payload := []byte("POST / HTTP/1.1\r\nHost: www.w3.org\r\nTransfer-Encoding: chunked\r\n\r\n4\r\nWiki\r\n5\r\npedia\r\ne\r\n in\r\n\r\nchunks.\r\n0\r\n\r\n")
+
+	payload = prettifyHTTP(payload)
+	if string(proto.Header(payload, []byte("Content-Length"))) != "23" {
+		t.Errorf("payload should have content length of 23")
+	}
+}

input_dummy.go

@@ -4,24 +4,33 @@ import (
 	"time"
 )
 
+// DummyInput used for debugging. It generate 1 "GET /"" request per second.
 type DummyInput struct {
 	data chan []byte
+	quit chan struct{}
 }
 
+// NewDummyInput constructor for DummyInput
 func NewDummyInput(options string) (di *DummyInput) {
 	di = new(DummyInput)
 	di.data = make(chan []byte)
+	di.quit = make(chan struct{})
 
 	go di.emit()
 
 	return
 }
 
-func (i *DummyInput) Read(data []byte) (int, error) {
-	buf := <-i.data
-	copy(data, buf)
-
-	return len(buf), nil
+// PluginRead reads message from this plugin
+func (i *DummyInput) PluginRead() (*Message, error) {
+	var msg Message
+	select {
+	case <-i.quit:
+		return nil, ErrorStopped
+	case buf := <-i.data:
+		msg.Meta, msg.Data = payloadMetaWithBody(buf)
+		return &msg, nil
+	}
 }
 
 func (i *DummyInput) emit() {
@@ -30,7 +39,12 @@ func (i *DummyInput) emit() {
 	for {
 		select {
 		case <-ticker.C:
-			i.data <- []byte("GET / HTTP/1.1\r\n\r\n")
+			uuid := uuid()
+			reqh := payloadHeader(RequestPayload, uuid, time.Now().UnixNano(), -1)
+			i.data <- append(reqh, []byte("GET / HTTP/1.1\r\nHost: www.w3.org\r\nUser-Agent: Go 1.1 package http\r\nAccept-Encoding: gzip\r\n\r\n")...)
+
+			resh := payloadHeader(ResponsePayload, uuid, time.Now().UnixNano()+1, 1)
+			i.data <- append(resh, []byte("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n")...)
 		}
 	}
 }
@@ -38,3 +52,9 @@ func (i *DummyInput) emit() {
 func (i *DummyInput) String() string {
 	return "Dummy Input"
 }
+
+// Close closes this plugins
+func (i *DummyInput) Close() error {
+	close(i.quit)
+	return nil
+}

input_file.go

@@ -1,66 +1,276 @@
 package main
 
 import (
-	"encoding/gob"
-	"log"
+	"bufio"
+	"bytes"
+	"compress/gzip"
+	"errors"
+	"fmt"
+	"io"
 	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
 	"time"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/s3"
 )
 
-type FileInput struct {
-	data    chan []byte
-	path    string
-	decoder *gob.Decoder
+type fileInputReader struct {
+	reader    *bufio.Reader
+	data      []byte
+	file      io.ReadCloser
+	timestamp int64
+	closed    int32 // Value of 0 indicates that the file is still open.
+	s3        bool
 }
 
-func NewFileInput(path string) (i *FileInput) {
+func (f *fileInputReader) parseNext() error {
+	payloadSeparatorAsBytes := []byte(payloadSeparator)
+	var buffer bytes.Buffer
+	for {
+		line, err := f.reader.ReadBytes('\n')
+
+		if err != nil {
+			if err != io.EOF {
+				Debug(1, err)
+			} else {
+				f.Close()
+			}
+			return err
+		}
+
+		if bytes.Equal(payloadSeparatorAsBytes[1:], line) {
+			asBytes := buffer.Bytes()
+			meta := payloadMeta(asBytes)
+
+			f.timestamp, _ = strconv.ParseInt(string(meta[2]), 10, 64)
+			f.data = asBytes[:len(asBytes)-1]
+
+			return nil
+		}
+
+		buffer.Write(line)
+	}
+
+}
+
+func (f *fileInputReader) ReadPayload() []byte {
+	defer f.parseNext()
+
+	return f.data
+}
+
+// Close closes this plugin
+func (f *fileInputReader) Close() error {
+	if atomic.LoadInt32(&f.closed) == 0 {
+		atomic.StoreInt32(&f.closed, 1)
+		f.file.Close()
+	}
+
+	return nil
+}
+
+func newFileInputReader(path string) *fileInputReader {
+	var file io.ReadCloser
+	var err error
+
+	if strings.HasPrefix(path, "s3://") {
+		file = NewS3ReadCloser(path)
+	} else {
+		file, err = os.Open(path)
+	}
+
+	if err != nil {
+		Debug(0, fmt.Sprintf("[INPUT-FILE] err: %q", err))
+		return nil
+	}
+
+	r := &fileInputReader{file: file, closed: 0}
+	if strings.HasSuffix(path, ".gz") {
+		gzReader, err := gzip.NewReader(file)
+		if err != nil {
+			Debug(0, fmt.Sprintf("[INPUT-FILE] err: %q", err))
+			return nil
+		}
+		r.reader = bufio.NewReader(gzReader)
+	} else {
+		r.reader = bufio.NewReader(file)
+	}
+
+	r.parseNext()
+
+	return r
+}
+
+// FileInput can read requests generated by FileOutput
+type FileInput struct {
+	mu          sync.Mutex
+	data        chan []byte
+	exit        chan bool
+	path        string
+	readers     []*fileInputReader
+	speedFactor float64
+	loop        bool
+}
+
+// NewFileInput constructor for FileInput. Accepts file path as argument.
+func NewFileInput(path string, loop bool) (i *FileInput) {
 	i = new(FileInput)
-	i.data = make(chan []byte)
+	i.data = make(chan []byte, 1000)
+	i.exit = make(chan bool)
 	i.path = path
-	i.Init(path)
+	i.speedFactor = 1
+	i.loop = loop
+
+	if err := i.init(); err != nil {
+		return
+	}
 
 	go i.emit()
 
 	return
 }
 
-func (i *FileInput) Init(path string) {
-	file, err := os.Open(path)
+func (i *FileInput) init() (err error) {
+	defer i.mu.Unlock()
+	i.mu.Lock()
 
-	if err != nil {
-		log.Fatal(i, "Cannot open file %q. Error: %s", path, err)
+	var matches []string
+
+	if strings.HasPrefix(i.path, "s3://") {
+		sess := session.Must(session.NewSession(awsConfig()))
+		svc := s3.New(sess)
+
+		bucket, key := parseS3Url(i.path)
+
+		params := &s3.ListObjectsInput{
+			Bucket: aws.String(bucket),
+			Prefix: aws.String(key),
+		}
+
+		resp, err := svc.ListObjects(params)
+		if err != nil {
+			Debug(0, "[INPUT-FILE] Error while retreiving list of files from S3", i.path, err)
+			return err
+		}
+
+		for _, c := range resp.Contents {
+			matches = append(matches, "s3://"+bucket+"/"+(*c.Key))
+		}
+	} else if matches, err = filepath.Glob(i.path); err != nil{ 
+			Debug(0, "[INPUT-FILE] Wrong file pattern", i.path, err)
+			return
+		
 	}
 
-	i.decoder = gob.NewDecoder(file)
+	if len(matches) == 0 {
+		Debug(0, "[INPUT-FILE] No files match pattern: ", i.path)
+		return errors.New("No matching files")
+	}
+
+	i.readers = make([]*fileInputReader, len(matches))
+
+	for idx, p := range matches {
+		i.readers[idx] = newFileInputReader(p)
+	}
+
+	return nil
 }
 
-func (i *FileInput) Read(data []byte) (int, error) {
-	buf := <-i.data
-	copy(data, buf)
-
-	return len(buf), nil
+// PluginRead reads message from this plugin
+func (i *FileInput) PluginRead() (*Message, error) {
+	var msg Message
+	select {
+	case <-i.exit:
+		return nil, ErrorStopped
+	case buf := <-i.data:
+		msg.Meta, msg.Data = payloadMetaWithBody(buf)
+		return &msg, nil
+	}
 }
 
 func (i *FileInput) String() string {
 	return "File input: " + i.path
 }
 
+// Find reader with smallest timestamp e.g next payload in row
+func (i *FileInput) nextReader() (next *fileInputReader) {
+	for _, r := range i.readers {
+		if r == nil || atomic.LoadInt32(&r.closed) != 0 {
+			continue
+		}
+
+		if next == nil || r.timestamp < next.timestamp {
+			next = r
+			continue
+		}
+	}
+
+	return
+}
+
 func (i *FileInput) emit() {
-	var lastTime int64
+	var lastTime int64 = -1
 
 	for {
-		raw := new(RawRequest)
-		err := i.decoder.Decode(raw)
-
-		if err != nil {
+		select {
+		case <-i.exit:
 			return
+		default:
 		}
 
-		if lastTime != 0 {
-			time.Sleep(time.Duration(raw.Timestamp - lastTime))
-		}
-		lastTime = raw.Timestamp
+		reader := i.nextReader()
 
-		i.data <- raw.Request
+		if reader == nil {
+			if i.loop {
+				i.init()
+				lastTime = -1
+				continue
+			} else {
+				break
+			}
+		}
+
+		if lastTime != -1 {
+			diff := reader.timestamp - lastTime
+			lastTime = reader.timestamp
+
+			if i.speedFactor != 1 {
+				diff = int64(float64(diff) / i.speedFactor)
+			}
+
+			time.Sleep(time.Duration(diff))
+		} else {
+			lastTime = reader.timestamp
+		}
+
+		// Recheck if we have exited since last check.
+		select {
+		case <-i.exit:
+			return
+		default:
+			i.data <- reader.ReadPayload()
+		}
 	}
+
+	Debug(0, fmt.Sprintf("[INPUT-FILE] FileInput: end of file '%s'\n", i.path))
+
+}
+
+// Close closes this plugin
+func (i *FileInput) Close() error {
+	defer i.mu.Unlock()
+	i.mu.Lock()
+
+	close(i.exit)
+	for _, r := range i.readers {
+		r.Close()
+	}
+
+	return nil
 }

input_file_test.go

@@ -0,0 +1,360 @@
+package main
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"math/rand"
+	"os"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestInputFileWithGET(t *testing.T) {
+	input := NewTestInput()
+	rg := NewRequestGenerator([]PluginReader{input}, func() { input.EmitGET() }, 1)
+	readPayloads := []*Message{}
+
+	// Given a capture file with a GET request
+	expectedCaptureFile := CreateCaptureFile(rg)
+	defer expectedCaptureFile.TearDown()
+
+	// When the request is read from the capture file
+	err := ReadFromCaptureFile(expectedCaptureFile.file, 1, func(msg *Message) {
+		readPayloads = append(readPayloads, msg)
+	})
+
+	// The read request should match the original request
+	if err != nil {
+		t.Error(err)
+	} else if !expectedCaptureFile.PayloadsEqual(readPayloads){
+			t.Error("Request read back from file should match")
+		
+	}
+}
+
+func TestInputFileWithPayloadLargerThan64Kb(t *testing.T) {
+	input := NewTestInput()
+	rg := NewRequestGenerator([]PluginReader{input}, func() { input.EmitSizedPOST(64 * 1024) }, 1)
+	readPayloads := []*Message{}
+
+	// Given a capture file with a request over 64Kb
+	expectedCaptureFile := CreateCaptureFile(rg)
+	defer expectedCaptureFile.TearDown()
+
+	// When the request is read from the capture file
+	err := ReadFromCaptureFile(expectedCaptureFile.file, 1, func(msg *Message) {
+		readPayloads = append(readPayloads, msg)
+	})
+
+	// The read request should match the original request
+	if err != nil {
+		t.Error(err)
+	} else if !expectedCaptureFile.PayloadsEqual(readPayloads){ 
+			t.Error("Request read back from file should match")
+		
+	}
+
+}
+
+func TestInputFileWithGETAndPOST(t *testing.T) {
+
+	input := NewTestInput()
+	rg := NewRequestGenerator([]PluginReader{input}, func() {
+		input.EmitGET()
+		input.EmitPOST()
+	}, 2)
+	readPayloads := []*Message{}
+
+	// Given a capture file with a GET request
+	expectedCaptureFile := CreateCaptureFile(rg)
+	defer expectedCaptureFile.TearDown()
+
+	// When the requests are read from the capture file
+	err := ReadFromCaptureFile(expectedCaptureFile.file, 2, func(msg *Message) {
+		readPayloads = append(readPayloads, msg)
+	})
+
+	// The read requests should match the original request
+	if err != nil {
+		t.Error(err)
+	} else if !expectedCaptureFile.PayloadsEqual(readPayloads){ 
+			t.Error("Request read back from file should match")
+		
+	}
+
+}
+
+func TestInputFileMultipleFilesWithRequestsOnly(t *testing.T) {
+	rnd := rand.Int63()
+
+	file1, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_0", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	file1.Write([]byte("1 1 1\ntest1"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte("1 1 3\ntest2"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Close()
+
+	file2, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_1", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	file2.Write([]byte("1 1 2\ntest3"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte("1 1 4\ntest4"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Close()
+
+	input := NewFileInput(fmt.Sprintf("/tmp/%d*", rnd), false)
+
+	for i := '1'; i <= '4'; i++ {
+		msg, _ := input.PluginRead()
+		if msg.Meta[4] != byte(i) {
+			t.Error("Should emit requests in right order", string(msg.Meta))
+		}
+	}
+
+	os.Remove(file1.Name())
+	os.Remove(file2.Name())
+}
+
+func TestInputFileRequestsWithLatency(t *testing.T) {
+	rnd := rand.Int63()
+
+	file, _ := os.OpenFile(fmt.Sprintf("/tmp/%d", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	defer file.Close()
+
+	file.Write([]byte("1 1 100000000\nrequest1"))
+	file.Write([]byte(payloadSeparator))
+	file.Write([]byte("1 2 150000000\nrequest2"))
+	file.Write([]byte(payloadSeparator))
+	file.Write([]byte("1 3 250000000\nrequest3"))
+	file.Write([]byte(payloadSeparator))
+
+	input := NewFileInput(fmt.Sprintf("/tmp/%d", rnd), false)
+
+	start := time.Now().UnixNano()
+	for i := 0; i < 3; i++ {
+		input.PluginRead()
+	}
+	end := time.Now().UnixNano()
+
+	var expectedLatency int64 = 300000000 - 100000000
+	realLatency := end - start
+	if realLatency > expectedLatency {
+		t.Errorf("Should emit requests respecting latency. Expected: %v, real: %v", expectedLatency, realLatency)
+	}
+}
+
+func TestInputFileMultipleFilesWithRequestsAndResponses(t *testing.T) {
+	rnd := rand.Int63()
+
+	file1, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_0", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	file1.Write([]byte("1 1 1\nrequest1"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte("2 1 1\nresponse1"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte("1 2 3\nrequest2"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Write([]byte("2 2 3\nresponse2"))
+	file1.Write([]byte(payloadSeparator))
+	file1.Close()
+
+	file2, _ := os.OpenFile(fmt.Sprintf("/tmp/%d_1", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	file2.Write([]byte("1 3 2\nrequest3"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte("2 3 2\nresponse3"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte("1 4 4\nrequest4"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Write([]byte("2 4 4\nresponse4"))
+	file2.Write([]byte(payloadSeparator))
+	file2.Close()
+
+	input := NewFileInput(fmt.Sprintf("/tmp/%d*", rnd), false)
+
+	for i := '1'; i <= '4'; i++ {
+		msg, _ := input.PluginRead()
+		if msg.Meta[0] != '1' && msg.Meta[4] != byte(i) {
+			t.Error("Shound emit requests in right order", string(msg.Meta))
+		}
+
+		msg, _ = input.PluginRead()
+		if msg.Meta[0] != '2' && msg.Meta[4] != byte(i) {
+			t.Error("Shound emit responses in right order", string(msg.Meta))
+		}
+	}
+
+	os.Remove(file1.Name())
+	os.Remove(file2.Name())
+}
+
+func TestInputFileLoop(t *testing.T) {
+	rnd := rand.Int63()
+
+	file, _ := os.OpenFile(fmt.Sprintf("/tmp/%d", rnd), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+	file.Write([]byte("1 1 1\ntest1"))
+	file.Write([]byte(payloadSeparator))
+	file.Write([]byte("1 1 2\ntest2"))
+	file.Write([]byte(payloadSeparator))
+	file.Close()
+
+	input := NewFileInput(fmt.Sprintf("/tmp/%d", rnd), true)
+
+	// Even if we have just 2 requests in file, it should indifinitly loop
+	for i := 0; i < 1000; i++ {
+		input.PluginRead()
+	}
+
+	input.Close()
+	os.Remove(file.Name())
+}
+
+func TestInputFileCompressed(t *testing.T) {
+	rnd := rand.Int63()
+
+	output := NewFileOutput(fmt.Sprintf("/tmp/%d_0.gz", rnd), &FileOutputConfig{FlushInterval: time.Minute, Append: true})
+	for i := 0; i < 1000; i++ {
+		output.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	}
+	name1 := output.file.Name()
+	output.Close()
+
+	output2 := NewFileOutput(fmt.Sprintf("/tmp/%d_1.gz", rnd), &FileOutputConfig{FlushInterval: time.Minute, Append: true})
+	for i := 0; i < 1000; i++ {
+		output2.PluginWrite(&Message{Meta: []byte("1 1 1\r\n"), Data: []byte("test")})
+	}
+	name2 := output2.file.Name()
+	output2.Close()
+
+	input := NewFileInput(fmt.Sprintf("/tmp/%d*", rnd), false)
+	for i := 0; i < 2000; i++ {
+		input.PluginRead()
+	}
+
+	os.Remove(name1)
+	os.Remove(name2)
+}
+
+type CaptureFile struct {
+	msgs []*Message
+	file *os.File
+}
+
+func NewExpectedCaptureFile(msgs []*Message, file *os.File) *CaptureFile {
+	ecf := new(CaptureFile)
+	ecf.file = file
+	ecf.msgs = msgs
+	return ecf
+}
+
+func (expectedCaptureFile *CaptureFile) TearDown() {
+	if expectedCaptureFile.file != nil {
+		os.Remove(expectedCaptureFile.file.Name())
+	}
+}
+
+type RequestGenerator struct {
+	inputs []PluginReader
+	emit   func()
+	wg     *sync.WaitGroup
+}
+
+func NewRequestGenerator(inputs []PluginReader, emit func(), count int) (rg *RequestGenerator) {
+	rg = new(RequestGenerator)
+	rg.inputs = inputs
+	rg.emit = emit
+	rg.wg = new(sync.WaitGroup)
+	rg.wg.Add(count)
+	return
+}
+
+func (expectedCaptureFile *CaptureFile) PayloadsEqual(other []*Message) bool {
+
+	if len(expectedCaptureFile.msgs) != len(other) {
+		return false
+	}
+
+	for i, payload := range other {
+		if !bytes.Equal(expectedCaptureFile.msgs[i].Meta, payload.Meta) {
+			return false
+		}
+		if !bytes.Equal(expectedCaptureFile.msgs[i].Data, payload.Data) {
+			return false
+		}
+	}
+
+	return true
+
+}
+
+func CreateCaptureFile(requestGenerator *RequestGenerator) *CaptureFile {
+	f, err := ioutil.TempFile("", "testmainconf")
+	if err != nil {
+		panic(err)
+	}
+
+	readPayloads := []*Message{}
+	output := NewTestOutput(func(msg *Message) {
+		readPayloads = append(readPayloads, msg)
+		requestGenerator.wg.Done()
+	})
+
+	outputFile := NewFileOutput(f.Name(), &FileOutputConfig{FlushInterval: time.Second, Append: true})
+
+	plugins := &InOutPlugins{
+		Inputs:  requestGenerator.inputs,
+		Outputs: []PluginWriter{output, outputFile},
+	}
+	for _, input := range requestGenerator.inputs {
+		plugins.All = append(plugins.All, input)
+	}
+	plugins.All = append(plugins.All, output, outputFile)
+
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
+
+	requestGenerator.emit()
+	requestGenerator.wg.Wait()
+
+	time.Sleep(100 * time.Millisecond)
+	emitter.Close()
+
+	return NewExpectedCaptureFile(readPayloads, f)
+
+}
+
+func ReadFromCaptureFile(captureFile *os.File, count int, callback writeCallback) (err error) {
+	wg := new(sync.WaitGroup)
+
+	input := NewFileInput(captureFile.Name(), false)
+	output := NewTestOutput(func(msg *Message) {
+		callback(msg)
+		wg.Done()
+	})
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
+
+	wg.Add(count)
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
+
+	done := make(chan int, 1)
+	go func() {
+		wg.Wait()
+		done <- 1
+	}()
+
+	select {
+	case <-done:
+		break
+	case <-time.After(2 * time.Second):
+		err = errors.New("Timed out")
+	}
+	emitter.Close()
+	return
+
+}

input_http.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"log"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"time"
+)
+
+// HTTPInput used for sending requests to Gor via http
+type HTTPInput struct {
+	data     chan []byte
+	address  string
+	listener net.Listener
+	stop     chan bool // Channel used only to indicate goroutine should shutdown
+}
+
+// NewHTTPInput constructor for HTTPInput. Accepts address with port which it will listen on.
+func NewHTTPInput(address string) (i *HTTPInput) {
+	i = new(HTTPInput)
+	i.data = make(chan []byte, 1000)
+	i.stop = make(chan bool)
+
+	i.listen(address)
+
+	return
+}
+
+// PluginRead reads message from this plugin
+func (i *HTTPInput) PluginRead() (*Message, error) {
+	var msg Message
+	select {
+	case <-i.stop:
+		return nil, ErrorStopped
+	case buf := <-i.data:
+		msg.Data = buf
+		msg.Meta = payloadHeader(RequestPayload, uuid(), time.Now().UnixNano(), -1)
+		return &msg, nil
+	}
+}
+
+// Close closes this plugin
+func (i *HTTPInput) Close() error {
+	close(i.stop)
+	return nil
+}
+
+func (i *HTTPInput) handler(w http.ResponseWriter, r *http.Request) {
+	r.URL.Scheme = "http"
+	r.URL.Host = i.address
+
+	buf, _ := httputil.DumpRequestOut(r, true)
+	http.Error(w, http.StatusText(200), 200)
+	i.data <- buf
+}
+
+func (i *HTTPInput) listen(address string) {
+	var err error
+
+	mux := http.NewServeMux()
+
+	mux.HandleFunc("/", i.handler)
+
+	i.listener, err = net.Listen("tcp", address)
+	if err != nil {
+		log.Fatal("HTTP input listener failure:", err)
+	}
+	i.address = i.listener.Addr().String()
+
+	go func() {
+		err = http.Serve(i.listener, mux)
+		if err != nil && err != http.ErrServerClosed {
+			log.Fatal("HTTP input serve failure ", err)
+		}
+	}()
+}
+
+func (i *HTTPInput) String() string {
+	return "HTTP input: " + i.address
+}

input_http_test.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"bytes"
+	"net/http"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestHTTPInput(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	input := NewHTTPInput("127.0.0.1:0")
+	time.Sleep(time.Millisecond)
+	output := NewTestOutput(func(*Message) {
+		wg.Done()
+	})
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
+
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
+
+	address := strings.Replace(input.address, "[::]", "127.0.0.1", -1)
+
+	for i := 0; i < 100; i++ {
+		wg.Add(1)
+		http.Get("http://" + address + "/")
+	}
+
+	wg.Wait()
+	emitter.Close()
+}
+
+func TestInputHTTPLargePayload(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	const n = 10 << 20 // 10MB
+	var large [n]byte
+	large[n-1] = '0'
+
+	input := NewHTTPInput("127.0.0.1:0")
+	output := NewTestOutput(func(msg *Message) {
+		_len := len(msg.Data)
+		if _len >= n { // considering http body CRLF
+			t.Errorf("expected body to be >= %d", n)
+		}
+		wg.Done()
+	})
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
+
+	emitter := NewEmitter()
+	defer emitter.Close()
+	go emitter.Start(plugins, Settings.Middleware)
+
+	address := strings.Replace(input.address, "[::]", "127.0.0.1", -1)
+	var req *http.Request
+	var err error
+	req, err = http.NewRequest("POST", "http://"+address, bytes.NewBuffer(large[:]))
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	wg.Add(1)
+	_, err = http.DefaultClient.Do(req)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	wg.Wait()
+}

input_kafka.go

@@ -0,0 +1,120 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"strings"
+
+	"github.com/Shopify/sarama"
+	"github.com/Shopify/sarama/mocks"
+)
+
+// KafkaInput is used for recieving Kafka messages and
+// transforming them into HTTP payloads.
+type KafkaInput struct {
+	config    *InputKafkaConfig
+	consumers []sarama.PartitionConsumer
+	messages  chan *sarama.ConsumerMessage
+	quit      chan struct{}
+}
+
+// NewKafkaInput creates instance of kafka consumer client with TLS config
+func NewKafkaInput(address string, config *InputKafkaConfig, tlsConfig *KafkaTLSConfig) *KafkaInput {
+	c := NewKafkaConfig(tlsConfig)
+
+	var con sarama.Consumer
+
+	if mock, ok := config.consumer.(*mocks.Consumer); ok && mock != nil {
+		con = config.consumer
+	} else {
+		var err error
+		con, err = sarama.NewConsumer(strings.Split(config.Host, ","), c)
+
+		if err != nil {
+			log.Fatalln("Failed to start Sarama(Kafka) consumer:", err)
+		}
+	}
+
+	partitions, err := con.Partitions(config.Topic)
+	if err != nil {
+		log.Fatalln("Failed to collect Sarama(Kafka) partitions:", err)
+	}
+
+	i := &KafkaInput{
+		config:    config,
+		consumers: make([]sarama.PartitionConsumer, len(partitions)),
+		messages:  make(chan *sarama.ConsumerMessage, 256),
+		quit:      make(chan struct{}),
+	}
+
+	for index, partition := range partitions {
+		consumer, err := con.ConsumePartition(config.Topic, partition, sarama.OffsetNewest)
+		if err != nil {
+			log.Fatalln("Failed to start Sarama(Kafka) partition consumer:", err)
+		}
+
+		go func(consumer sarama.PartitionConsumer) {
+			defer consumer.Close()
+
+			for message := range consumer.Messages() {
+				i.messages <- message
+			}
+		}(consumer)
+
+		go i.ErrorHandler(consumer)
+
+		i.consumers[index] = consumer
+	}
+
+	return i
+}
+
+// ErrorHandler should receive errors
+func (i *KafkaInput) ErrorHandler(consumer sarama.PartitionConsumer) {
+	for err := range consumer.Errors() {
+		Debug(1, "Failed to read access log entry:", err)
+	}
+}
+
+// PluginRead a reads message from this plugin
+func (i *KafkaInput) PluginRead() (*Message, error) {
+	var message *sarama.ConsumerMessage
+	var msg Message
+	select {
+	case <-i.quit:
+		return nil, ErrorStopped
+	case message = <-i.messages:
+	}
+
+	msg.Data = message.Value
+	if i.config.UseJSON {
+
+		var kafkaMessage KafkaMessage
+		json.Unmarshal(message.Value, &kafkaMessage)
+
+		var err error
+		msg.Data, err = kafkaMessage.Dump()
+		if err != nil {
+			Debug(1, "[INPUT-KAFKA] failed to decode access log entry:", err)
+			return nil, err
+		}
+	}
+
+	// does it have meta
+	if isOriginPayload(msg.Data) {
+		msg.Meta, msg.Data = payloadMetaWithBody(msg.Data)
+	}
+
+	return &msg, nil
+
+}
+
+func (i *KafkaInput) String() string {
+	return "Kafka Input: " + i.config.Host + "/" + i.config.Topic
+}
+
+// Close closes this plugin
+func (i *KafkaInput) Close() error {
+	close(i.quit)
+	return nil
+}

input_kafka_test.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/Shopify/sarama"
+	"github.com/Shopify/sarama/mocks"
+)
+
+func TestInputKafkaRAW(t *testing.T) {
+	consumer := mocks.NewConsumer(t, nil)
+	defer consumer.Close()
+
+	consumer.ExpectConsumePartition("test", 0, mocks.AnyOffset).YieldMessage(&sarama.ConsumerMessage{Value: []byte("1 2 3\nGET / HTTP1.1\r\nHeader: 1\r\n\r\n")})
+	consumer.SetTopicMetadata(
+		map[string][]int32{"test": {0}},
+	)
+
+	input := NewKafkaInput("", &InputKafkaConfig{
+		consumer: consumer,
+		Topic:    "test",
+		UseJSON:  false,
+	}, nil)
+
+	msg, err := input.PluginRead()
+
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if string(append(msg.Meta, msg.Data...)) != "1 2 3\nGET / HTTP1.1\r\nHeader: 1\r\n\r\n" {
+		t.Error("Message not properly decoded")
+	}
+}
+
+func TestInputKafkaJSON(t *testing.T) {
+	consumer := mocks.NewConsumer(t, nil)
+	defer consumer.Close()
+
+	consumer.ExpectConsumePartition("test", 0, mocks.AnyOffset).YieldMessage(&sarama.ConsumerMessage{Value: []byte(`{"Req_URL":"/","Req_Type":"1","Req_ID":"2","Req_Ts":"3","Req_Method":"GET","Req_Headers":{"Header":"1"}}`)})
+	consumer.SetTopicMetadata(
+		map[string][]int32{"test": {0}},
+	)
+
+	input := NewKafkaInput("", &InputKafkaConfig{
+		consumer: consumer,
+		Topic:    "test",
+		UseJSON:  true,
+	}, nil)
+
+	msg, err := input.PluginRead()
+
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if string(append(msg.Meta, msg.Data...)) != "1 2 3\nGET / HTTP/1.1\r\nHeader: 1\r\n\r\n" {
+		t.Error("Message not properly decoded")
+	}
+}

input_raw.go

@@ -1,53 +1,229 @@
 package main
 
 import (
-	raw "github.com/buger/gor/raw_socket_listener"
+	"context"
+	"fmt"
 	"log"
 	"net"
-	"strings"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/buger/goreplay/capture"
+	"github.com/buger/goreplay/proto"
+	"github.com/buger/goreplay/size"
+	"github.com/buger/goreplay/tcp"
 )
 
-type RAWInput struct {
-	data    chan []byte
-	address string
+// TCPProtocol is a number to indicate type of protocol
+type TCPProtocol uint8
+
+const (
+	// ProtocolHTTP ...
+	ProtocolHTTP TCPProtocol = iota
+	// ProtocolBinary ...
+	ProtocolBinary
+)
+
+// Set is here so that TCPProtocol can implement flag.Var
+func (protocol *TCPProtocol) Set(v string) error {
+	switch v {
+	case "", "http":
+		*protocol = ProtocolHTTP
+	case "binary":
+		*protocol = ProtocolBinary
+	default:
+		return fmt.Errorf("unsupported protocol %s", v)
+	}
+	return nil
 }
 
-func NewRAWInput(address string) (i *RAWInput) {
-	i = new(RAWInput)
-	i.data = make(chan []byte)
-	i.address = address
+func (protocol *TCPProtocol) String() string {
+	switch *protocol {
+	case ProtocolBinary:
+		return "binary"
+	case ProtocolHTTP:
+		return "http"
+	default:
+		return ""
+	}
+}
 
-	go i.listen(address)
+// RAWInputConfig represents configuration that can be applied on raw input
+type RAWInputConfig struct {
+	capture.PcapOptions
+	Expire         time.Duration      `json:"input-raw-expire"`
+	CopyBufferSize size.Size          `json:"copy-buffer-size"`
+	Engine         capture.EngineType `json:"input-raw-engine"`
+	TrackResponse  bool               `json:"input-raw-track-response"`
+	Protocol       TCPProtocol        `json:"input-raw-protocol"`
+	RealIPHeader   string             `json:"input-raw-realip-header"`
+	Stats          bool               `json:"input-raw-stats"`
+	quit           chan bool          // Channel used only to indicate goroutine should shutdown
+	host           string
+	port           uint16
+}
+
+// RAWInput used for intercepting traffic for given address
+type RAWInput struct {
+	sync.Mutex
+	RAWInputConfig
+	messageStats   []tcp.Stats
+	listener       *capture.Listener
+	message        chan *tcp.Message
+	cancelListener context.CancelFunc
+	closed         bool
+}
+
+// NewRAWInput constructor for RAWInput. Accepts raw input config as arguments.
+func NewRAWInput(address string, config RAWInputConfig) (i *RAWInput) {
+	i = new(RAWInput)
+	i.RAWInputConfig = config
+	i.message = make(chan *tcp.Message, 10000)
+	i.quit = make(chan bool)
+	var host, _port string
+	var err error
+	var port int
+	host, _port, err = net.SplitHostPort(address)
+	if err != nil {
+		log.Fatalf("input-raw: error while parsing address: %s", err)
+	}
+	if _port != "" {
+		port, err = strconv.Atoi(_port)
+	}
+
+	if err != nil {
+		log.Fatalf("parsing port error: %v", err)
+	}
+	i.host = host
+	i.port = uint16(port)
+
+	i.listen(address)
 
 	return
 }
 
-func (i *RAWInput) Read(data []byte) (int, error) {
-	buf := <-i.data
-	copy(data, buf)
+// PluginRead reads meassage from this plugin
+func (i *RAWInput) PluginRead() (*Message, error) {
+	var msgTCP *tcp.Message
+	var msg Message
+	select {
+	case <-i.quit:
+		return nil, ErrorStopped
+	case msgTCP = <-i.message:
+		msg.Data = msgTCP.Data()
+	}
+	var msgType byte = ResponsePayload
+	if msgTCP.IsRequest {
+		msgType = RequestPayload
+		if i.RealIPHeader != "" {
+			msg.Data = proto.SetHeader(msg.Data, []byte(i.RealIPHeader), []byte(msgTCP.SrcAddr))
+		}
+	}
+	msg.Meta = payloadHeader(msgType, msgTCP.UUID(), msgTCP.Start.UnixNano(), msgTCP.End.UnixNano()-msgTCP.Start.UnixNano())
 
-	return len(buf), nil
+	// to be removed....
+	if msgTCP.Truncated {
+		Debug(2, "[INPUT-RAW] message truncated, increase copy-buffer-size")
+	}
+	// to be removed...
+	if msgTCP.TimedOut {
+		Debug(2, "[INPUT-RAW] message timeout reached, increase input-raw-expire")
+	}
+	if i.Stats {
+		stat := msgTCP.Stats
+		go i.addStats(stat)
+	}
+	msgTCP.Finalize()
+	msgTCP = nil
+	return &msg, nil
 }
 
 func (i *RAWInput) listen(address string) {
-	address = strings.Replace(address, "[::]", "127.0.0.1", -1)
-
-	host, port, err := net.SplitHostPort(address)
-
+	var err error
+	i.listener, err = capture.NewListener(i.host, i.port, "", i.Engine, i.TrackResponse, Settings.maxAllowedMem)
 	if err != nil {
-		log.Fatal("input-raw: error while parsing address", err)
+		log.Fatal(err)
 	}
-
-	listener := raw.NewListener(host, port)
-
-	for {
-		// Receiving TCPMessage object
-		m := listener.Receive()
-
-		i.data <- m.Bytes()
+	i.listener.SetPcapOptions(i.PcapOptions)
+	err = i.listener.Activate()
+	if err != nil {
+		log.Fatal(err)
 	}
+	parser := tcp.NewMessageParser(i.CopyBufferSize, i.Expire, Debug, i.messageEmitter)
+
+	if i.Protocol == ProtocolHTTP {
+		parser.Start = http1StartHint
+		parser.End = http1EndHint
+	}
+	var ctx context.Context
+	ctx, i.cancelListener = context.WithCancel(context.Background())
+	errCh := i.listener.ListenBackground(ctx, parser.PacketHandler)
+	<-i.listener.Reading
+	Debug(1, i)
+	go func() {
+		<-errCh // the listener closed voluntarily
+		i.Close()
+	}()
+}
+
+func (i *RAWInput) messageEmitter(m *tcp.Message) {
+	i.message <- m
 }
 
 func (i *RAWInput) String() string {
-	return "RAW Socket input: " + i.address
+	return fmt.Sprintf("Intercepting traffic from: %s:%d", i.host, i.port)
+}
+
+// GetStats returns the stats so far and reset the stats
+func (i *RAWInput) GetStats() []tcp.Stats {
+	i.Lock()
+	defer func() {
+		i.messageStats = []tcp.Stats{}
+		i.Unlock()
+	}()
+	return i.messageStats
+}
+
+// Close closes the input raw listener
+func (i *RAWInput) Close() error {
+	i.Lock()
+	defer i.Unlock()
+	if i.closed {
+		return nil
+	}
+	i.cancelListener()
+	close(i.quit)
+	i.closed = true
+	return nil
+}
+
+func (i *RAWInput) addStats(mStats tcp.Stats) {
+	i.Lock()
+	if len(i.messageStats) >= 10000 {
+		i.messageStats = []tcp.Stats{}
+	}
+	i.messageStats = append(i.messageStats, mStats)
+	i.Unlock()
+}
+
+func http1StartHint(pckt *tcp.Packet) (isRequest, isResponse bool) {
+	if proto.HasRequestTitle(pckt.Payload) {
+		return true, false
+	}
+
+	if proto.HasResponseTitle(pckt.Payload) {
+		return false, true
+	}
+
+	// No request or response detected
+	return false, false
+}
+
+func http1EndHint(m *tcp.Message) bool {
+	if m.MissingChunk() {
+		return false
+	}
+
+	return proto.HasFullPayload(m, m.PacketData()...)
 }

input_raw_test.go

@@ -1,39 +1,350 @@
 package main
 
 import (
-	"io"
+	"bytes"
+	"io/ioutil"
+	"net"
 	"net/http"
+	"net/http/httptest"
+	"net/http/httputil"
+	"os/exec"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"testing"
+	"time"
+
+	"github.com/buger/goreplay/capture"
+	"github.com/buger/goreplay/proto"
 )
 
-func TestRAWInput(t *testing.T) {
+const testRawExpire = time.Millisecond * 200
 
+func TestRAWInputIPv4(t *testing.T) {
 	wg := new(sync.WaitGroup)
-	quit := make(chan int)
 
-	listener := startHTTP(func(req *http.Request) {})
+	listener, err := net.Listen("tcp4", "127.0.0.1:0")
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	origin := &http.Server{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			w.Write([]byte("ab"))
+		}),
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+	go origin.Serve(listener)
+	defer listener.Close()
+	_, port, _ := net.SplitHostPort(listener.Addr().String())
 
-	input := NewRAWInput(listener.Addr().String())
-	output := NewTestOutput(func(data []byte) {
+	var respCounter, reqCounter int64
+	conf := RAWInputConfig{
+		Engine:        capture.EnginePcap,
+		Expire:        0,
+		Protocol:      ProtocolHTTP,
+		TrackResponse: true,
+		RealIPHeader:  "X-Real-IP",
+	}
+	input := NewRAWInput(listener.Addr().String(), conf)
+
+	output := NewTestOutput(func(msg *Message) {
+		if msg.Meta[0] == '1' {
+			if len(proto.Header(msg.Data, []byte("X-Real-IP"))) == 0 {
+				t.Error("Should have X-Real-IP header")
+			}
+			reqCounter++
+		} else {
+			respCounter++
+		}
 		wg.Done()
 	})
 
-	Plugins.Inputs = []io.Reader{input}
-	Plugins.Outputs = []io.Writer{output}
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
 
-	address := strings.Replace(listener.Addr().String(), "[::]", "127.0.0.1", -1)
+	addr := "http://127.0.0.1:" + port
+	emitter := NewEmitter()
+	defer emitter.Close()
+	go emitter.Start(plugins, Settings.Middleware)
+	for i := 0; i < 1; i++ {
+		wg.Add(2)
+		_, err = http.Get(addr)
+		if err != nil {
+			t.Error(err)
+			return
+		}
+	}
+	wg.Wait()
+	const want = 10
+	if reqCounter != respCounter && reqCounter != want {
+		t.Errorf("want %d requests and %d responses, got %d requests and %d responses", want, want, reqCounter, respCounter)
+	}
+}
 
-	go Start(quit)
+func TestRAWInputNoKeepAlive(t *testing.T) {
+	wg := new(sync.WaitGroup)
 
-	for i := 0; i < 100; i++ {
-		wg.Add(1)
-		res, _ := http.Get("http://" + address)
-		res.Body.Close()
+	listener, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	origin := &http.Server{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			w.Write([]byte("ab"))
+		}),
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+	origin.SetKeepAlivesEnabled(false)
+	go origin.Serve(listener)
+	defer listener.Close()
+	_, port, _ := net.SplitHostPort(listener.Addr().String())
+
+	conf := RAWInputConfig{
+		Engine:        capture.EnginePcap,
+		Expire:        testRawExpire,
+		Protocol:      ProtocolHTTP,
+		TrackResponse: true,
+	}
+	input := NewRAWInput(":"+port, conf)
+	var respCounter, reqCounter int64
+	output := NewTestOutput(func(msg *Message) {
+		if msg.Meta[0] == '1' {
+			atomic.AddInt64(&reqCounter, 1)
+		} else {
+			atomic.AddInt64(&respCounter, 1)
+		}
+		wg.Done()
+	})
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
+
+	addr := "http://127.0.0.1:" + port
+
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
+
+	for i := 0; i < 10; i++ {
+		// request + response
+		wg.Add(2)
+		_, err = http.Get(addr)
+		if err != nil {
+			t.Error(err)
+			return
+		}
 	}
 
 	wg.Wait()
+	const want = 10
+	if reqCounter != respCounter && reqCounter != want {
+		t.Errorf("want %d requests and %d responses, got %d requests and %d responses", want, want, reqCounter, respCounter)
+	}
+	emitter.Close()
+}
 
-	close(quit)
+func TestRAWInputIPv6(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	listener, err := net.Listen("tcp", "[::1]:0")
+	if err != nil {
+		return
+	}
+	origin := &http.Server{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			w.Write([]byte("ab"))
+		}),
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+	go origin.Serve(listener)
+	defer listener.Close()
+	_, port, _ := net.SplitHostPort(listener.Addr().String())
+	originAddr := "[::1]:" + port
+
+	var respCounter, reqCounter int64
+	conf := RAWInputConfig{
+		Engine:        capture.EnginePcap,
+		Protocol:      ProtocolHTTP,
+		TrackResponse: true,
+	}
+	input := NewRAWInput(originAddr, conf)
+
+	output := NewTestOutput(func(msg *Message) {
+		if msg.Meta[0] == '1' {
+			atomic.AddInt64(&reqCounter, 1)
+		} else {
+			atomic.AddInt64(&respCounter, 1)
+		}
+		wg.Done()
+	})
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+
+	emitter := NewEmitter()
+	addr := "http://" + originAddr
+	go emitter.Start(plugins, Settings.Middleware)
+	for i := 0; i < 10; i++ {
+		// request + response
+		wg.Add(2)
+		_, err = http.Get(addr)
+		if err != nil {
+			t.Error(err)
+			return
+		}
+	}
+
+	wg.Wait()
+	const want = 10
+	if reqCounter != respCounter && reqCounter != want {
+		t.Errorf("want %d requests and %d responses, got %d requests and %d responses", want, want, reqCounter, respCounter)
+	}
+	emitter.Close()
+}
+
+func TestInputRAWChunkedEncoding(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	fileContent, _ := ioutil.ReadFile("README.md")
+
+	// Origing and Replay server initialization
+	origin := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer r.Body.Close()
+		ioutil.ReadAll(r.Body)
+
+		wg.Done()
+	}))
+
+	originAddr := strings.Replace(origin.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+	conf := RAWInputConfig{
+		Engine:        capture.EnginePcap,
+		Expire:        time.Second,
+		Protocol:      ProtocolHTTP,
+		TrackResponse: true,
+	}
+	input := NewRAWInput(originAddr, conf)
+
+	replay := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer r.Body.Close()
+		body, _ := ioutil.ReadAll(r.Body)
+
+		if !bytes.Equal(body, fileContent) {
+			buf, _ := httputil.DumpRequest(r, true)
+			t.Error("Wrong POST body:", string(buf))
+		}
+
+		wg.Done()
+	}))
+	defer replay.Close()
+
+	httpOutput := NewHTTPOutput(replay.URL, &HTTPOutputConfig{})
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{httpOutput},
+	}
+	plugins.All = append(plugins.All, input, httpOutput)
+
+	emitter := NewEmitter()
+	defer emitter.Close()
+	go emitter.Start(plugins, Settings.Middleware)
+	wg.Add(2)
+
+	curl := exec.Command("curl", "http://"+originAddr, "--header", "Transfer-Encoding: chunked", "--header", "Expect:", "--data-binary", "@README.md")
+	err := curl.Run()
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	wg.Wait()
+}
+
+func BenchmarkRAWInputWithReplay(b *testing.B) {
+	var respCounter, reqCounter, replayCounter uint32
+	wg := &sync.WaitGroup{}
+
+	listener, err := net.Listen("tcp4", "127.0.0.1:0")
+	if err != nil {
+		b.Error(err)
+		return
+	}
+	listener0, err := net.Listen("tcp4", "127.0.0.1:0")
+	if err != nil {
+		b.Error(err)
+		return
+	}
+
+	origin := http.Server{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			w.Write([]byte("ab"))
+		}),
+	}
+	go origin.Serve(listener)
+	defer origin.Close()
+	originAddr := listener.Addr().String()
+
+	replay := http.Server{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			atomic.AddUint32(&replayCounter, 1)
+			w.Write(nil)
+			wg.Done()
+		}),
+	}
+	go replay.Serve(listener0)
+	defer replay.Close()
+	replayAddr := listener0.Addr().String()
+
+	conf := RAWInputConfig{
+		Engine:        capture.EnginePcap,
+		Expire:        testRawExpire,
+		Protocol:      ProtocolHTTP,
+		TrackResponse: true,
+	}
+	input := NewRAWInput(originAddr, conf)
+
+	testOutput := NewTestOutput(func(msg *Message) {
+		if msg.Meta[0] == '1' {
+			reqCounter++
+		} else {
+			respCounter++
+		}
+		wg.Done()
+	})
+	httpOutput := NewHTTPOutput("http://"+replayAddr, &HTTPOutputConfig{})
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{testOutput, httpOutput},
+	}
+
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
+	addr := "http://" + originAddr
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		wg.Add(3) // reqCounter + replayCounter + respCounter
+		resp, err := http.Get(addr)
+		if err != nil {
+			wg.Add(-3)
+		}
+		resp.Body.Close()
+	}
+
+	wg.Wait()
+	b.ReportMetric(float64(reqCounter), "requests")
+	b.ReportMetric(float64(respCounter), "responses")
+	b.ReportMetric(float64(replayCounter), "replayed")
+	emitter.Close()
 }

input_tcp.go

@@ -2,79 +2,128 @@ package main
 
 import (
 	"bufio"
+	"bytes"
+	"crypto/tls"
+	"fmt"
 	"io"
 	"log"
 	"net"
 )
 
-// Can be tested using nc tool:
-//    echo "asdad" | nc 127.0.0.1 27017
-//
+// TCPInput used for internal communication
 type TCPInput struct {
-	data     chan []byte
-	address  string
+	data     chan *Message
 	listener net.Listener
+	address  string
+	config   *TCPInputConfig
+	stop     chan bool // Channel used only to indicate goroutine should shutdown
 }
 
-func NewTCPInput(address string) (i *TCPInput) {
+// TCPInputConfig represents configuration of a TCP input plugin
+type TCPInputConfig struct {
+	Secure          bool   `json:"input-tcp-secure"`
+	CertificatePath string `json:"input-tcp-certificate"`
+	KeyPath         string `json:"input-tcp-certificate-key"`
+}
+
+// NewTCPInput constructor for TCPInput, accepts address with port
+func NewTCPInput(address string, config *TCPInputConfig) (i *TCPInput) {
 	i = new(TCPInput)
-	i.data = make(chan []byte)
+	i.data = make(chan *Message, 1000)
 	i.address = address
+	i.config = config
+	i.stop = make(chan bool)
 
 	i.listen(address)
 
 	return
 }
 
-func (i *TCPInput) Read(data []byte) (int, error) {
-	buf := <-i.data
-	copy(data, buf)
+// PluginRead returns data and details read from plugin
+func (i *TCPInput) PluginRead() (msg *Message, err error) {
+	select {
+	case <-i.stop:
+		return nil, ErrorStopped
+	case msg = <-i.data:
+		return msg, nil
+	}
 
-	return len(buf), nil
+}
+
+// Close closes the plugin
+func (i *TCPInput) Close() error {
+	close(i.stop)
+	i.listener.Close()
+	return nil
 }
 
 func (i *TCPInput) listen(address string) {
-	listener, err := net.Listen("tcp", address)
-	i.listener = listener
+	if i.config.Secure {
+		cer, err := tls.LoadX509KeyPair(i.config.CertificatePath, i.config.KeyPath)
+		if err != nil {
+			log.Fatalln("error while loading --input-tcp TLS certificate:", err)
+		}
 
-	if err != nil {
-		log.Fatal("Can't start:", err)
+		config := &tls.Config{Certificates: []tls.Certificate{cer}}
+		listener, err := tls.Listen("tcp", address, config)
+		if err != nil {
+			log.Fatalln("[INPUT-TCP] failed to start INPUT-TCP listener:", err)
+		}
+		i.listener = listener
+	} else {
+		listener, err := net.Listen("tcp", address)
+		if err != nil {
+			log.Fatalln("failed to start INPUT-TCP listener:", err)
+		}
+		i.listener = listener
 	}
-
 	go func() {
 		for {
-			conn, err := listener.Accept()
-
-			if err != nil {
-				log.Println("Error while Accept()", err)
+			conn, err := i.listener.Accept()
+			if err == nil {
+				go i.handleConnection(conn)
 				continue
 			}
-
-			go i.handleConnection(conn)
+			if isTemporaryNetworkError(err) {
+				continue
+			}
+			if operr, ok := err.(*net.OpError); ok && operr.Err.Error() != "use of closed network connection" {
+				Debug(0, fmt.Sprintf("[INPUT-TCP] listener closed, err: %q", err))
+			}
+			break
 		}
 	}()
 }
 
+var payloadSeparatorAsBytes = []byte(payloadSeparator)
+
 func (i *TCPInput) handleConnection(conn net.Conn) {
 	defer conn.Close()
 
 	reader := bufio.NewReader(conn)
+	var buffer bytes.Buffer
 
 	for {
-		buf,err := reader.ReadBytes('¶')
-		buf_len := len(buf)
-		if buf_len > 0 {
-			new_buf_len := len(buf) - 2
-			if new_buf_len > 0 {
-				new_buf := make([]byte, new_buf_len)
-				copy(new_buf, buf[:new_buf_len])
-				i.data <- new_buf
-				if err != nil {
-					if err != io.EOF {
-						log.Printf("error: %s\n", err)
-					}
-				}
+		line, err := reader.ReadBytes('\n')
+		if err != nil {
+			if isTemporaryNetworkError(err) {
+				continue
 			}
+			if err != io.EOF {
+				Debug(0, fmt.Sprintf("[INPUT-TCP] connection error: %q", err))
+			}
+			break
+		}
+
+		if bytes.Equal(payloadSeparatorAsBytes[1:], line) {
+			// unread the '\n' before monkeys
+			buffer.UnreadByte()
+			var msg Message
+			msg.Meta, msg.Data = payloadMetaWithBody(buffer.Bytes())
+			i.data <- &msg
+			buffer.Reset()
+		} else {
+			buffer.Write(line)
 		}
 	}
 }
@@ -82,3 +131,13 @@ func (i *TCPInput) handleConnection(conn net.Conn) {
 func (i *TCPInput) String() string {
 	return "TCP input: " + i.address
 }
+
+func isTemporaryNetworkError(err error) bool {
+	if nerr, ok := err.(net.Error); ok && nerr.Temporary() {
+		return true
+	}
+	if operr, ok := err.(*net.OpError); ok && operr.Temporary() {
+		return true
+	}
+	return false
+}

input_tcp_test.go

@@ -1,26 +1,38 @@
 package main
 
 import (
-	"io"
+	"bytes"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/pem"
+	"io/ioutil"
 	"log"
+	"math/big"
 	"net"
+	"os"
 	"sync"
 	"testing"
+	"time"
 )
 
 func TestTCPInput(t *testing.T) {
 	wg := new(sync.WaitGroup)
-	quit := make(chan int)
 
-	input := NewTCPInput(":0")
-	output := NewTestOutput(func(data []byte) {
+	input := NewTCPInput("127.0.0.1:0", &TCPInputConfig{})
+	output := NewTestOutput(func(*Message) {
 		wg.Done()
 	})
 
-	Plugins.Inputs = []io.Reader{input}
-	Plugins.Outputs = []io.Writer{output}
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
 
-	go Start(quit)
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
 
 	tcpAddr, err := net.ResolveTCPAddr("tcp", input.listener.Addr().String())
 
@@ -29,84 +41,102 @@ func TestTCPInput(t *testing.T) {
 	}
 
 	conn, err := net.DialTCP("tcp", nil, tcpAddr)
-
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	msg := []byte("GET / HTTP/1.1\r\n\r\n")
+	msg := []byte("1 1 1\nGET / HTTP/1.1\r\n\r\n")
 
 	for i := 0; i < 100; i++ {
 		wg.Add(1)
-		new_buf := make([]byte, len(msg) + 2)
-		msg = append(msg,[]byte("¶")...)
-		copy(new_buf, msg)
-		conn.Write(new_buf)
+		if _, err = conn.Write(msg); err == nil {
+			_, err = conn.Write(payloadSeparatorAsBytes)
+		}
+		if err != nil {
+			t.Error(err)
+			return
+		}
 	}
-
 	wg.Wait()
-
-	close(quit)
+	emitter.Close()
 }
 
-func BenchmarkTCPInput(b *testing.B) {
-	wg := new(sync.WaitGroup)
-	quit := make(chan int)
+func genCertificate(template *x509.Certificate) ([]byte, []byte) {
+	priv, _ := rsa.GenerateKey(rand.Reader, 2048)
 
-	input := NewTCPInput(":0")
-	output := NewTestOutput(func(data []byte) {
+	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
+	serialNumber, _ := rand.Int(rand.Reader, serialNumberLimit)
+	template.SerialNumber = serialNumber
+	template.BasicConstraintsValid = true
+	template.NotBefore = time.Now()
+	template.NotAfter = time.Now().Add(time.Hour)
+
+	derBytes, _ := x509.CreateCertificate(rand.Reader, template, template, &priv.PublicKey, priv)
+
+	var certPem, keyPem bytes.Buffer
+	pem.Encode(&certPem, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
+	pem.Encode(&keyPem, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
+
+	return certPem.Bytes(), keyPem.Bytes()
+}
+
+func TestTCPInputSecure(t *testing.T) {
+	serverCertPem, serverPrivPem := genCertificate(&x509.Certificate{
+		DNSNames:    []string{"localhost"},
+		IPAddresses: []net.IP{net.ParseIP("127.0.0.1"), net.ParseIP("::")},
+	})
+
+	serverCertPemFile, _ := ioutil.TempFile("", "server.crt")
+	serverCertPemFile.Write(serverCertPem)
+	serverCertPemFile.Close()
+
+	serverPrivPemFile, _ := ioutil.TempFile("", "server.key")
+	serverPrivPemFile.Write(serverPrivPem)
+	serverPrivPemFile.Close()
+
+	defer func() {
+		os.Remove(serverPrivPemFile.Name())
+		os.Remove(serverCertPemFile.Name())
+	}()
+
+	wg := new(sync.WaitGroup)
+
+	input := NewTCPInput("127.0.0.1:0", &TCPInputConfig{
+		Secure:          true,
+		CertificatePath: serverCertPemFile.Name(),
+		KeyPath:         serverPrivPemFile.Name(),
+	})
+	output := NewTestOutput(func(*Message) {
 		wg.Done()
 	})
 
-	Plugins.Inputs = []io.Reader{input}
-	Plugins.Outputs = []io.Writer{output}
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
 
-	go Start(quit)
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
 
-	tcpAddr, err := net.ResolveTCPAddr("tcp", input.listener.Addr().String())
+	conf := &tls.Config{
+		InsecureSkipVerify: true,
+	}
 
+	conn, err := tls.Dial("tcp", input.listener.Addr().String(), conf)
 	if err != nil {
-		log.Fatal(err)
+		t.Fatal(err)
 	}
+	defer conn.Close()
 
-	var connections []net.Conn
+	msg := []byte("1 1 1\nGET / HTTP/1.1\r\n\r\n")
 
-	// Creating simple pool of workers, same as output_tcp have
-	dataChan := make(chan []byte, 1000)
-
-	for i := 0; i < 10; i++ {
-		conn, _ := net.DialTCP("tcp", nil, tcpAddr)
-		connections = append(connections, conn)
-
-		go func(conn net.Conn) {
-			for {
-				data := <-dataChan
-
-				new_buf := make([]byte, len(data) + 2)
-				data = append(data,[]byte("¶")...)
-				copy(new_buf, data)
-				conn.Write(new_buf)
-			}
-		}(conn)
-	}
-
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	msg := []byte("GET / HTTP/1.1\r\n\r\n")
-
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
+	for i := 0; i < 100; i++ {
 		wg.Add(1)
-		dataChan <- msg
+		conn.Write(msg)
+		conn.Write([]byte(payloadSeparator))
 	}
 
 	wg.Wait()
-
-	for _, conn := range connections {
-		conn.Close()
-	}
-
-	close(quit)
+	emitter.Close()
 }

kafka.go

@@ -0,0 +1,118 @@
+package main
+
+import (
+	"bytes"
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"log"
+
+	"github.com/Shopify/sarama"
+	"github.com/buger/goreplay/proto"
+)
+
+// InputKafkaConfig should contains required information to
+// build producers.
+type InputKafkaConfig struct {
+	producer sarama.AsyncProducer
+	consumer sarama.Consumer
+	Host     string `json:"input-kafka-host"`
+	Topic    string `json:"input-kafka-topic"`
+	UseJSON  bool   `json:"input-kafka-json-format"`
+}
+
+// OutputKafkaConfig is the representation of kfka output configuration
+type OutputKafkaConfig struct {
+	producer sarama.AsyncProducer
+	consumer sarama.Consumer
+	Host     string `json:"output-kafka-host"`
+	Topic    string `json:"output-kafka-topic"`
+	UseJSON  bool   `json:"output-kafka-json-format"`
+}
+
+// KafkaTLSConfig should contains TLS certificates for connecting to secured Kafka clusters
+type KafkaTLSConfig struct {
+	CACert     string `json:"kafka-tls-ca-cert"`
+	ClientCert string `json:"kafka-tls-client-cert"`
+	ClientKey  string `json:"kafka-tls-client-key"`
+}
+
+// KafkaMessage should contains catched request information that should be
+// passed as Json to Apache Kafka.
+type KafkaMessage struct {
+	ReqURL     string            `json:"Req_URL"`
+	ReqType    string            `json:"Req_Type"`
+	ReqID      string            `json:"Req_ID"`
+	ReqTs      string            `json:"Req_Ts"`
+	ReqMethod  string            `json:"Req_Method"`
+	ReqBody    string            `json:"Req_Body,omitempty"`
+	ReqHeaders map[string]string `json:"Req_Headers,omitempty"`
+}
+
+
+// NewTLSConfig loads TLS certificates
+func NewTLSConfig(clientCertFile, clientKeyFile, caCertFile string) (*tls.Config, error) {
+	tlsConfig := tls.Config{}
+
+	if clientCertFile != "" && clientKeyFile == "" {
+		return &tlsConfig, errors.New("Missing key of client certificate in kafka")
+	}
+	if clientCertFile == "" && clientKeyFile != "" {
+		return &tlsConfig, errors.New("missing TLS client certificate in kafka")
+	}
+	// Load client cert
+	if  (clientCertFile != "") && (clientKeyFile != "") {
+		cert, err := tls.LoadX509KeyPair(clientCertFile, clientKeyFile)
+		if err != nil {
+			return &tlsConfig, err
+		}
+		tlsConfig.Certificates = []tls.Certificate{cert}
+	}
+	// Load CA cert
+	if caCertFile != "" {
+		caCert, err := ioutil.ReadFile(caCertFile)
+		if err != nil {
+			return &tlsConfig, err
+		}
+		caCertPool := x509.NewCertPool()
+		caCertPool.AppendCertsFromPEM(caCert)
+		tlsConfig.RootCAs = caCertPool
+	}
+	return &tlsConfig, nil
+}
+
+// NewKafkaConfig returns Kafka config with or without TLS
+func NewKafkaConfig(tlsConfig *KafkaTLSConfig) *sarama.Config {
+	config := sarama.NewConfig()
+	// Configuration options go here
+	if tlsConfig != nil && (tlsConfig.ClientCert != "" || tlsConfig.CACert != "") {
+		config.Net.TLS.Enable = true
+		tlsConfig, err := NewTLSConfig(tlsConfig.ClientCert, tlsConfig.ClientKey, tlsConfig.CACert)
+		if err != nil {
+			log.Fatal(err)
+		}
+		config.Net.TLS.Config = tlsConfig
+	}
+	return config
+}
+
+// Dump returns the given request in its HTTP/1.x wire
+// representation.
+func (m KafkaMessage) Dump() ([]byte, error) {
+	var b bytes.Buffer
+
+	b.WriteString(fmt.Sprintf("%s %s %s\n", m.ReqType, m.ReqID, m.ReqTs))
+	b.WriteString(fmt.Sprintf("%s %s HTTP/1.1", m.ReqMethod, m.ReqURL))
+	b.Write(proto.CRLF)
+	for key, value := range m.ReqHeaders {
+		b.WriteString(fmt.Sprintf("%s: %s", key, value))
+		b.Write(proto.CRLF)
+	}
+
+	b.Write(proto.CRLF)
+	b.WriteString(m.ReqBody)
+
+	return b.Bytes(), nil
+}

limiter.go

@@ -3,43 +3,110 @@ package main
 import (
 	"fmt"
 	"io"
+	"math/rand"
+	"strconv"
+	"strings"
 	"time"
 )
 
+// Limiter is a wrapper for input or output plugin which adds rate limiting
 type Limiter struct {
-	writer io.Writer
-	limit  int
+	plugin    interface{}
+	limit     int
+	isPercent bool
 
 	currentRPS  int
 	currentTime int64
 }
 
-func NewLimiter(writer io.Writer, limit int) (l *Limiter) {
-	l = new(Limiter)
-	l.limit = limit
-	l.writer = writer
-	l.currentTime = time.Now().UnixNano()
+func parseLimitOptions(options string) (limit int, isPercent bool) {
+	if n := strings.Index(options, "%"); n > 0 {
+		limit, _ = strconv.Atoi(options[:n])
+		isPercent = true
+	} else {
+		limit, _ = strconv.Atoi(options)
+		isPercent = false
+	}
 
 	return
 }
 
-func (l *Limiter) Write(data []byte) (n int, err error) {
+// NewLimiter constructor for Limiter, accepts plugin and options
+// `options` allow to sprcify relatve or absolute limiting
+func NewLimiter(plugin interface{}, options string) PluginReadWriter {
+	l := new(Limiter)
+	l.limit, l.isPercent = parseLimitOptions(options)
+	l.plugin = plugin
+	l.currentTime = time.Now().UnixNano()
+
+	// FileInput have its own rate limiting. Unlike other inputs we not just dropping requests, we can slow down or speed up request emittion.
+	if fi, ok := l.plugin.(*FileInput); ok && l.isPercent {
+		fi.speedFactor = float64(l.limit) / float64(100)
+	}
+
+	return l
+}
+
+func (l *Limiter) isLimited() bool {
+	// File input have its own limiting algorithm
+	if _, ok := l.plugin.(*FileInput); ok && l.isPercent {
+		return false
+	}
+
+	if l.isPercent {
+		return l.limit <= rand.Intn(100)
+	}
+
 	if (time.Now().UnixNano() - l.currentTime) > time.Second.Nanoseconds() {
 		l.currentTime = time.Now().UnixNano()
 		l.currentRPS = 0
 	}
 
 	if l.currentRPS >= l.limit {
-		return 0, nil
+		return true
 	}
 
-	n, err = l.writer.Write(data)
-
 	l.currentRPS++
 
+	return false
+}
+
+// PluginWrite writes message to this plugin
+func (l *Limiter) PluginWrite(msg *Message) (n int, err error) {
+	if l.isLimited() {
+		return 0, nil
+	}
+	if w, ok := l.plugin.(PluginWriter); ok {
+		return w.PluginWrite(msg)
+	}
+	// avoid further writing
+	return 0, io.ErrClosedPipe
+}
+
+// PluginRead reads message from this plugin
+func (l *Limiter) PluginRead() (msg *Message, err error) {
+	if r, ok := l.plugin.(PluginReader); ok {
+		msg, err = r.PluginRead()
+	} else {
+		// avoid further reading
+		return nil, io.ErrClosedPipe
+	}
+
+	if l.isLimited() {
+		return nil, nil
+	}
+
 	return
 }
 
 func (l *Limiter) String() string {
-	return fmt.Sprintf("Limiting %s to: %d", l.writer, l.limit)
+	return fmt.Sprintf("Limiting %s to: %d (isPercent: %v)", l.plugin, l.limit, l.isPercent)
+}
+
+// Close closes the resources.
+func (l *Limiter) Close() error {
+	if fi, ok := l.plugin.(io.Closer); ok {
+		fi.Close()
+	}
+	return nil
 }

limiter_test.go

@@ -1,31 +1,111 @@
+// +build !race
+
 package main
 
 import (
-	"io"
 	"sync"
 	"testing"
 )
 
-func TestLimiter(t *testing.T) {
+func TestOutputLimiter(t *testing.T) {
 	wg := new(sync.WaitGroup)
-	quit := make(chan int)
 
 	input := NewTestInput()
-	output := NewLimiter(NewTestOutput(func(data []byte) {
+	output := NewLimiter(NewTestOutput(func(*Message) {
 		wg.Done()
-	}), 10)
+	}), "10")
 	wg.Add(10)
 
-	Plugins.Inputs = []io.Reader{input}
-	Plugins.Outputs = []io.Writer{output}
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
 
-	go Start(quit)
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
+
+	for i := 0; i < 100; i++ {
+		input.EmitGET()
+	}
+
+	wg.Wait()
+	emitter.Close()
+}
+
+func TestInputLimiter(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	input := NewLimiter(NewTestInput(), "10")
+	output := NewTestOutput(func(*Message) {
+		wg.Done()
+	})
+	wg.Add(10)
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
+
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
+
+	for i := 0; i < 100; i++ {
+		input.(*Limiter).plugin.(*TestInput).EmitGET()
+	}
+
+	wg.Wait()
+	emitter.Close()
+}
+
+// Should limit all requests
+func TestPercentLimiter1(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	input := NewTestInput()
+	output := NewLimiter(NewTestOutput(func(*Message) {
+		wg.Done()
+	}), "0%")
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
+
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
+
+	for i := 0; i < 100; i++ {
+		input.EmitGET()
+	}
+
+	wg.Wait()
+}
+
+// Should not limit at all
+func TestPercentLimiter2(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	input := NewTestInput()
+	output := NewLimiter(NewTestOutput(func(*Message) {
+		wg.Done()
+	}), "100%")
+	wg.Add(100)
+
+	plugins := &InOutPlugins{
+		Inputs:  []PluginReader{input},
+		Outputs: []PluginWriter{output},
+	}
+	plugins.All = append(plugins.All, input, output)
+
+	emitter := NewEmitter()
+	go emitter.Start(plugins, Settings.Middleware)
 
 	for i := 0; i < 100; i++ {
 		input.EmitGET()
 	}
 
 	wg.Wait()
-
-	close(quit)
 }

middleware.go

@@ -0,0 +1,166 @@
+package main
+
+import (
+	"bufio"
+	"context"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+	"sync"
+	"syscall"
+)
+
+// Middleware represents a middleware object
+type Middleware struct {
+	command       string
+	data          chan *Message
+	Stdin         io.Writer
+	Stdout        io.Reader
+	commandCancel context.CancelFunc
+	stop          chan bool // Channel used only to indicate goroutine should shutdown
+	closed        bool
+	mu            sync.RWMutex
+}
+
+// NewMiddleware returns new middleware
+func NewMiddleware(command string) *Middleware {
+	m := new(Middleware)
+	m.command = command
+	m.data = make(chan *Message, 1000)
+	m.stop = make(chan bool)
+
+	commands := strings.Split(command, " ")
+	ctx, cancl := context.WithCancel(context.Background())
+	m.commandCancel = cancl
+	cmd := exec.CommandContext(ctx, commands[0], commands[1:]...)
+
+	m.Stdout, _ = cmd.StdoutPipe()
+	m.Stdin, _ = cmd.StdinPipe()
+
+	cmd.Stderr = os.Stderr
+
+	go m.read(m.Stdout)
+
+	go func() {
+		defer m.Close()
+		var err error
+		if err = cmd.Start(); err == nil {
+			err = cmd.Wait()
+		}
+		if err != nil {
+			if e, ok := err.(*exec.ExitError); ok {
+				status := e.Sys().(syscall.WaitStatus)
+				if status.Signal() == syscall.SIGKILL /*killed or context canceld */ {
+					return
+				}
+			}
+			Debug(0, fmt.Sprintf("[MIDDLEWARE] command[%q] error: %q", command, err.Error()))
+		}
+	}()
+
+	return m
+}
+
+// ReadFrom start a worker to read from this plugin
+func (m *Middleware) ReadFrom(plugin PluginReader) {
+	Debug(2, fmt.Sprintf("[MIDDLEWARE] command[%q] Starting reading from %q", m.command, plugin))
+	go m.copy(m.Stdin, plugin)
+}
+
+func (m *Middleware) copy(to io.Writer, from PluginReader) {
+	var buf, dst []byte
+
+	for {
+		msg, err := from.PluginRead()
+		if err != nil {
+			return
+		}
+		if msg == nil || len(msg.Data) == 0 {
+			continue
+		}
+		buf = msg.Data
+		if Settings.PrettifyHTTP {
+			buf = prettifyHTTP(msg.Data)
+		}
+		dstLen := (len(buf)+len(msg.Meta))*2 + 1
+		// if enough space was previously allocated use it instead
+		if dstLen > len(dst) {
+			dst = make([]byte, dstLen)
+		}
+		n := hex.Encode(dst, msg.Meta)
+		n += hex.Encode(dst[n:], buf)
+		dst[n] = '\n'
+
+		n, err = to.Write(dst[:n+1])
+		if err == nil {
+			continue
+		}
+		if m.isClosed() {
+			return
+		}
+	}
+}
+
+func (m *Middleware) read(from io.Reader) {
+	reader := bufio.NewReader(from)
+	var line []byte
+	var e error
+	for {
+		if line, e = reader.ReadBytes('\n'); e != nil {
+			if m.isClosed() {
+				return
+			}
+			continue
+		}
+		buf := make([]byte, (len(line)-1)/2)
+		if _, err := hex.Decode(buf, line[:len(line)-1]); err != nil {
+			Debug(0, fmt.Sprintf("[MIDDLEWARE] command[%q] failed to decode err: %q", m.command, err))
+			continue
+		}
+		var msg Message
+		msg.Meta, msg.Data = payloadMetaWithBody(buf)
+		select {
+		case <-m.stop:
+			return
+		case m.data <- &msg:
+		}
+	}
+
+}
+
+// PluginRead reads message from this plugin
+func (m *Middleware) PluginRead() (msg *Message, err error) {
+	select {
+	case <-m.stop:
+		return nil, ErrorStopped
+	case msg = <-m.data:
+	}
+
+	return
+}
+
+func (m *Middleware) String() string {
+	return fmt.Sprintf("Modifying traffic using %q command", m.command)
+}
+
+func (m *Middleware) isClosed() bool {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	return m.closed
+}
+
+// Close closes this plugin
+func (m *Middleware) Close() error {
+	if m.isClosed() {
+		return nil
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.commandCancel()
+	close(m.stop)
+	m.closed = true
+	return nil
+}

middleware/README.md

@@ -0,0 +1,122 @@
+# GoReplay middleware
+
+GoReplay support protocol for writing middleware in any language, which allows you to implement custom logic like authentification or complex rewriting and filterting. See protocol description here: https://github.com/buger/goreplay/wiki/Middleware, but the basic idea that middleware process receive hex encoded data via STDIN and emits it back via STDOUT. STDERR for loggin inside middleware. Yes, that's simple.
+
+To simplify middleware creation we provide packages for NodeJS and Go (upcoming).
+
+If you want to get access to original and replayed responses, do not forget adding `--output-http-track-response` and `--input-raw-track-response` options.
+
+## NodeJS
+
+Before starting, you should install the package via npm: `npm install goreplay_middleware`.
+And initialize middleware the following way:
+```javascript
+var gor = require("goreplay_middleware");
+// `init` will initialize STDIN listener
+gor.init();
+```
+
+Basic idea is that you write callbacks which respond to `request`, `response`, `replay`, or `message` events, which contain request meta information and actuall http paylod. Depending on your needs you may compare, override or filter incoming requests and responses.
+
+You can respond to the incoming events using `on` function, by providing callbacks:
+```javascript
+// valid events are `request`, `response` (original response), `replay` (replayed response), and `message` (all events)
+gor.on('request', function(data) {
+    // `data` contains incoming message its meta information.
+    data
+
+    // Raw HTTP payload of `Buffer` type
+    // Example (hidden character for line endings shown on purpose):
+    //   GET / HTTP/1.1\r\n
+    //   User-Agent: Golang\r\n
+    //   \r\n
+    data.http
+
+    // Meta is an array size of 4, containing:
+    //   1. request type - 1, 2 or 3 (which maps to `request`, `respose` and `replay`)
+    //   2. uuid - request unique identifier. Request responses have the same ID as their request.
+    //   3. timestamp of when request was made (for responses it is time of request start too)
+    //   4. latency - time difference between request start and finish. For `request` is zero.
+    data.meta
+
+    // Unique request ID. It should be same for `request`, `response` and `replay` events of the same request.
+    data.ID
+
+    // You should return data at the end of function, even if you not changed request, if you do not want to filter it out.
+    // If you just `return` nothing, request will be filtered
+    return data
+})
+```
+### Mapping requests and responses
+You can provide request ID as additional argument to `on` function, which allow you to map related requests and responses. Below is example of middleware which checks that original and replayed response have same HTTP status code.
+
+```javascript
+// Example of very basic way to compare if replayed traffic have no errors
+gor.on("request", function(req) {
+    gor.on("response", req.ID, function(resp) {
+        gor.on("replay", req.ID, function(repl) {
+            if (gor.httpStatus(resp.http) != gor.httpStatus(repl.http)) {
+                // Note that STDERR is used for logging, and it actually will be send to `Gor` STDOUT.
+                // This trick is used because SDTIN and STDOUT already used for process communication.
+                // You can write logger that writes to files insead.
+                console.error(`${gor.httpPath(req.http)} STATUS NOT MATCH: 'Expected ${gor.httpStatus(resp.http)}' got '${gor.httpStatus(repl.http)}'`)
+            }
+            return repl;
+        })
+        return resp;
+    })
+    return req
+})
+```
+
+This middleware includes `searchResponses` helper which is used to compare value of original response with the replayed response. If authentication system or xsrf protection returns unique tokens in headers or the response, it will be helpful to rewrite your requests based on them. Because tokens are unique, and the value contained in original and replayed responses will be different. So, you need to extract value from both responses, and rewrite requests based on those mappings.
+
+`searchResponses` accepts request id, regexp pattern for searching the compared value (should include capture group), and callback which returns both original and replayed matched value.
+
+Example: 
+```javascript
+   // Compare HTTP headers for response and replayed response, and map values
+let tokMap = {};
+
+gor.on("request", function(req) {
+    let tok = gor.httpHeader(req.http, "Auth-Token");
+    if (tok && tokMap[tok]) {
+        req.http = gor.setHttpHeader(req.http, "Auth-Token", tokMap[tok]) 
+    }
+    
+    gor.searchResponses(req.ID, "X-Set-Token: (\w+)$", function(respTok, replTok) {
+        if (respTok && replTok) tokMap[respTok] = replTok;
+    })
+
+    return req;
+})
+```
+
+
+### API documentation
+
+Package expose following functions to process raw HTTP payloads:
+* `init` - initialize middleware object, start reading from STDIN.
+* `httpPath` - URL path of the request: `gor.httpPath(req.http)`
+* `httpMethod` - Http method: 'GET', 'POST', etc. `gor.httpMethod(req.http)`. 
+* `setHttpPath` - update URL path: `req.http = gor.setHttpPath(req.http, newPath)`
+* `httpPathParam` - get param from URL path: `gor.httpPathParam(req.http, queryParam)`
+* `setHttpPathParam` - set URL param: `req.http = gor.setHttpPathParam(req.http, queryParam, value)` 
+* `httpStatus` - response status code
+* `httpHeaders` - get all headers: `gor.httpHeaders(req.http)`
+* `httpHeader` - get HTTP header: `gor.httpHeader(req.http, "Content-Length")`
+* `setHttpHeader` - Set HTTP header, returns modified payload: `req.http = gor.setHttpHeader(req.http, "X-Replayed", "1")`
+* `httpBody` - get HTTP Body: `gor.httpBody(req.http)`
+* `setHttpBody` - Set HTTP Body and ensures that `Content-Length` header have proper value. Returns modified payload: `req.http = gor.setHttpBody(req.http, Buffer.from('hello!'))`.
+* `httpBodyParam` - get POST body param: `gor.httpBodyParam(req.http, param)`
+* `setHttpBodyParam` - set POST body param: `req.http = gor.setHttpBodyParam(req.http, param, value)`
+* `httpCookie` - get HTTP cookie: `gor.httpCookie(req.http, "SESSSION_ID")`
+* `setHttpCookie` - set HTTP cookie, returns modified payload: `req.http = gor.setHttpCookie(req.http, "iam", "cuckoo")`
+* `deleteHttpCookie` - delete HTTP cookie, returns modified payload: `req.http = gor.deleteHttpCookie(req.http, "iam")`
+
+Also it is totally legit to use standard `Buffer` functions like `indexOf` for processing the HTTP payload. Just do not forget that if you modify the body, update the `Content-Length` header with a new value. And if you modify any of the headers, line endings should be `\r\n`. Rest is up to your imagination.
+
+
+## Support
+
+Feel free to ask questions here and by sending email to [support@goreplay.org](mailto:support@goreplay.org). Commercial support is available and welcomed 🙈.

middleware/middleware.js

@@ -0,0 +1,790 @@
+// ======= GoReplay Middleware helper =============
+// Created by Leonid Bugaev in 2017
+//
+// For questions use GitHub or support@goreplay.org
+//
+// GoReplay: https://github.com/buger/goreplay
+// Middleware package: https://github.com/buger/goreplay/middleware
+
+var middleware;
+
+function init() {
+    var proxy = {
+        ch: {},
+        on: function(chan, id, cb) {
+            if (!cb && id) {
+                cb = id;
+            } else if (cb && id) {
+                chan = chan + "#" + id;
+            }
+
+            if (!proxy.ch[chan]) {
+                proxy.ch[chan] = [];
+            }
+
+            proxy.ch[chan].push({
+                created: new Date(),
+                cb: cb
+            });
+
+            return proxy;
+        },
+
+        emit: function(msg, raw) {
+            var chanPrefix;
+
+            switch(msg.type) {
+                case "1": chanPrefix = "request"; break;
+                case "2": chanPrefix = "response"; break;
+                case "3": chanPrefix = "replay"; break;
+            }
+
+            let resp = msg;
+
+            ["message", chanPrefix, chanPrefix + "#" + msg.ID].forEach(function(chanID, idx){
+                if (proxy.ch[chanID]) {
+                    proxy.ch[chanID].forEach(function(ch){
+                        let r = ch.cb(msg);
+                        if (resp) resp = r; // If one of callback decided not to send response back, do not override it in global callbacks
+                    })
+                    
+                    // Cleanup Individual message channels to avoid memory leaks
+                    if (idx == 2) {
+                        delete proxy.ch[chanID]
+                    }
+                }
+            })
+
+            if (resp) {
+              process.stdout.write(`${resp.rawMeta.toString('hex')}${Buffer.from("\n").toString("hex")}${resp.http.toString('hex')}\n`)
+            }
+
+            return resp
+        }
+    }
+
+    // Clean up old messaged ID specific channels if they are older then 60s
+    let gc = function(gcTime){
+        let now = new Date();
+        for (k in proxy.ch) {
+            if (k.indexOf("#") == -1) continue;
+
+            proxy.ch[k] = proxy.ch[k].filter(function(ch){
+                return (now - ch.created) < gcTime
+            })
+
+            if (proxy.ch[k].length == 0) {
+                delete proxy.ch[k]
+            }
+        }
+    }
+    proxy.gc = gc
+
+    setInterval(function(){
+        gc(10 * 1000)
+    }, 1000);
+
+    const readline = require('readline');
+    const rl = readline.createInterface({
+          input: process.stdin
+    });
+
+    rl.on('line', function(line) {
+        let msg = parseMessage(line)
+        if (msg) {
+            proxy.emit(msg, line)
+        }
+    });
+
+    middleware = proxy;
+
+    return proxy;
+}
+
+
+function parseMessage(msg) {
+    try {
+        let payload = Buffer.from(msg, "hex");
+        let metaPos = payload.indexOf("\n");
+        let meta = payload.slice(0, metaPos);
+        let metaArr = meta.toString("ascii").split(" ");
+        let pType = metaArr[0];
+        let pID = metaArr[1];
+        let raw = payload.slice(metaPos + 1, payload.length);
+
+        return {
+            type: pType,
+            ID: pID,
+            rawMeta: meta,
+            meta: metaArr,
+            http: raw
+        }
+    } catch(e) {
+        fail(`Error while parsing incoming request: ${msg}`)
+    }
+}
+
+// Used to compare values from original and replayed responses
+// Accepts request id, regexp pattern for searching the compared value (should include capture group), and callback which returns both original and replayed matched value.
+// Example: 
+//
+//   // Compare HTTP headers for response and replayed response, and map values
+//   let tokMap = {};
+//
+//   gor.on("request", function(req) {
+//     let tok = gor.httpHeader(req.http, "Auth-Token");
+//     if (tok && tokMap[tok]) {
+//       req.http = gor.setHttpHeader(req.http, "Auth-Token", tokMap[tok]) 
+//     }
+//
+//     gor.searchResponses(req.ID, "X-Set-Token: (\w+)$", function(respTok, replTok) {
+//       tokMap[respTok] = replTok;
+//     })
+//
+//     return req;
+//   })
+//
+function searchResponses(id, searchPattern, callback) {
+    let re = new RegExp(searchPattern);
+
+    // Using regexp require converting buffer to string
+    // Before converting to string we can use initial `Buffer.indexOf` check
+    let indexPattern = searchPattern.split("(")[0];
+
+    if (!indexPattern) {
+        console.error("Search regexp should include capture group, pointing to the value: `prefix-(.*)`")
+        return
+    }
+
+    middleware.on("response", id, function(resp){
+        if (resp.http.indexOf(indexPattern) == -1) {
+            callback()
+            return resp
+        }
+
+        let respMatch = resp.http.toString('utf-8').match(re);
+        if (!respMatch) {
+            callback()
+            return resp
+        }
+
+        middleware.on("replay", id, function(repl) {
+            if (repl.http.indexOf(indexPattern) == -1) {
+                callback(respMatch[1]);
+                return repl;
+            }
+
+            let replMatch = repl.http.toString('utf-8').match(re);
+
+            if (!replMatch) {
+                callback(respMatch[1]);
+                return repl;
+            }
+        
+            callback(respMatch[1], replMatch[1]);
+            
+            return repl;
+        })
+
+        return resp;
+    })
+}
+
+
+// =========== HTTP parsing =================
+
+// Example HTTP payload record (including hidden characters):
+//
+//  POST / HTTP/1.1\r\n
+//  User-Agent: Node\r\n
+//  Content-Length: 5\r\n
+//  \r\n
+//  hello
+
+function httpMethod(payload) {
+    var pEnd = payload.indexOf(' ');
+    return payload.slice(0, pEnd).toString("ascii");
+}
+
+function httpPath(payload) {
+    var pStart = payload.indexOf(' ') + 1;
+    var pEnd = payload.indexOf(' ', pStart);
+    return payload.slice(pStart, pEnd).toString("ascii");
+}
+
+function setHttpPath(payload, newPath) {
+    var pStart = payload.indexOf(' ') + 1;
+    var pEnd = payload.indexOf(' ', pStart);
+
+    return Buffer.concat([payload.slice(0, pStart), Buffer.from(newPath), payload.slice(pEnd, payload.length)])
+}
+
+function httpPathParam(payload, name) {
+    let path = httpPath(payload);
+    let re = new RegExp(name + "=([^&$]+)");
+    let match = path.match(re);
+
+    if (match) return decodeURI(match[1]);
+}
+
+function setHttpPathParam(payload, name, value) {
+    let path = httpPath(payload);
+    let re = new RegExp(name + "=([^&$]+)");
+    let newPath = path.replace(re, name + "=" + encodeURI(value));
+    
+    // If we should add new param instead
+    if (newPath == path) {
+        if (newPath.indexOf("?") == -1) {
+            newPath += "?"
+        } else {
+            newPath += "&"
+        }
+
+        newPath += name + "=" + encodeURI(value);
+    }
+
+    return setHttpPath(payload, newPath)
+}
+
+// HTTP response have status code in same position as `path` for requests
+function httpStatus(payload) {
+    return httpPath(payload);
+}
+
+function setHttpStatus(payload, newStatus) {
+    return setHttpPath(payload, newStatus);
+}
+
+function httpHeaders(payload) {
+    var httpHeaderString = payload.slice(0,payload.indexOf("\r\n\r\n") + 4).toString().split("\n").slice(1);
+    var headers = {};
+
+    for (var item in httpHeaderString) {
+        var parts = httpHeaderString[item].split(":");
+
+        if (parts.length > 1) {
+            headers[parts[0]] = parts.slice(1).join(":").trim();    
+        }
+    }
+
+    return headers;
+}
+
+function httpHeader(payload, name) {
+    var currentLine = 0;
+    var i = 0;
+    var header = { start: -1, end: -1, valueStart: -1 }
+    var nameBuf = Buffer.from(name);
+    var nameBufLower = Buffer.from(name.toLowerCase());
+
+    while(c = payload[i]) {
+        if (c == 13) { // new line "\n"
+            currentLine++;
+            i++
+            header.end = i
+
+            if (currentLine > 0 && header.start > 0 && header.valueStart > 0) {
+                if (nameBuf.compare(payload, header.start, header.valueStart - 1) == 0 ||
+                    nameBufLower.compare(payload, header.start, header.valueStart - 1) == 0) { // ensure that headers are not case sensitive
+                    header.value = payload.slice(header.valueStart, header.end - 1).toString("utf-8").trim();
+                    header.name = payload.slice(header.start, header.valueStart - 1).toString("utf-8");
+                    return header
+                }
+            }
+
+            header.start = -1
+            header.valueStart = -1
+            continue;
+        } else if (c == 10) { // "\r"
+            i++
+            continue;
+        } else if (c == 58) { // ":" Header/value separator symbol
+            if (header.valueStart == -1) {
+                header.valueStart = i + 1;
+                i++
+                continue;
+            }
+        }
+
+        if (header.start == -1) header.start = i;
+
+        i++
+    }
+
+    return
+}
+
+function setHttpHeader(payload, name, value) {
+    let header = httpHeader(payload, name);
+    if (!header) {
+        let headerStart = payload.indexOf(13) + 1;
+        return Buffer.concat([payload.slice(0, headerStart + 1), Buffer.from(name + ": " + value + "\r\n"), payload.slice(headerStart + 1, payload.length)])
+    } else {
+        return Buffer.concat([payload.slice(0, header.valueStart), Buffer.from(" " + value + "\r\n"), payload.slice(header.end + 1, payload.length)])
+    }
+}
+
+function deleteHttpHeader(payload, name) {
+	let header = httpHeader(payload, name);
+
+    if (header) {
+        return Buffer.concat([payload.slice(0, header.start), payload.slice(header.end+1, payload.length)])
+    }
+
+	return payload
+}
+
+function httpBody(payload) {
+    let bodyIndex = payload.indexOf("\r\n\r\n");
+    if (-1 != bodyIndex){
+        return payload.slice(bodyIndex + 4, payload.length);   
+    } else {
+        return null;
+    }
+}
+
+function setHttpBody(payload, newBody) {
+    let p = setHttpHeader(payload, "Content-Length", newBody.length)
+    let headerEnd = p.indexOf("\r\n\r\n") + 4;
+    return Buffer.concat([p.slice(0, headerEnd), newBody])
+}
+
+function httpBodyParam(payload, name) {
+    let body = httpBody(payload);
+    let re = new RegExp(name + "=([^&$]+)");
+    if (body.indexOf(name + "=") != -1) {
+        let param = body.toString('utf-8').match(re);
+        if (param) {
+            return decodeURI(param[1]);
+        }
+    }
+}
+
+function setHttpBodyParam(payload, name, value) {
+    let body = httpBody(payload);
+    let re = new RegExp(name + "=([^&$]+)");
+
+    let newBody = body.toString('utf-8');
+
+    if (newBody.indexOf(name + "=") != -1 ) {
+        newBody = newBody.replace(re, name + "=" + encodeURI(value));
+    } else {
+        if (newBody.indexOf("=") != -1) {
+            newBody += "&";
+        }
+        newBody += name + "=" + value;
+    }
+    
+    return setHttpBody(payload, Buffer.from(newBody));
+}
+
+function setHttpCookie(payload, name, value) {
+    let h = httpHeader(payload, "Cookie");
+    let cookie = h ? h.value : "";
+    let cookies = cookie.split("; ").filter(function(v){ return v.indexOf(name + "=") != 0 })
+    cookies.push(name + "=" + value)
+    return setHttpHeader(payload, "Cookie", cookies.join("; "))
+}
+
+function deleteHttpCookie(payload, name) {
+    let h = httpHeader(payload, "Cookie");
+    let cookie = h ? h.value : "";
+    let cookies = cookie.split("; ").filter(function(v){ return v.indexOf(name + "=") != 0 })
+    return setHttpHeader(payload, "Cookie", cookies.join("; "))
+}
+
+function httpCookie(payload, name) {
+    let h = httpHeader(payload, "Cookie");
+    let cookie = h ? h.value : "";
+    let value;
+    let cookies = cookie.split("; ").forEach(function(v){
+        if (v.indexOf(name + "=") == 0) {
+            value = v.substr(name.length + 1);
+        }
+    })
+    return value;
+}
+
+module.exports = {
+    init: init,
+    on: function(){ return middleware.on.apply(this, arguments) },
+    parseMessage: parseMessage,
+    searchResponses: searchResponses,
+    httpPath: httpPath,
+    httpMethod: httpMethod,
+    setHttpPath: setHttpPath,
+    httpPathParam: httpPathParam,
+    setHttpPathParam: setHttpPathParam,
+    httpStatus: httpStatus,
+    setHttpStatus: setHttpStatus,
+    httpHeader: httpHeader,
+    setHttpHeader: setHttpHeader,
+    deleteHttpHeader: deleteHttpHeader,
+    httpBody: httpBody,
+    setHttpBody: setHttpBody,
+    httpBodyParam: httpBodyParam,
+    setHttpBodyParam: setHttpBodyParam,
+    httpCookie: httpCookie,
+    setHttpCookie: setHttpCookie,
+    deleteHttpCookie: deleteHttpCookie,
+    test: testRunner,
+    benchmark: testBenchmark,
+    httpHeaders: httpHeaders
+}
+
+
+// =========== Tests ==============
+
+function testRunner(){
+    ["init", "filter", "parseMessage", "httpMethod", "httpPath", "setHttpHeader", "deleteHttpHeader", "httpPathParam", "httpHeader", "httpBody", "setHttpBody", "httpBodyParam", "httpCookie", "setHttpCookie", "deleteHttpCookie", "httpHeaders"].forEach(function(t){
+        console.log(`====== Start ${t} =======`)
+        eval(`TEST_${t}()`)
+        console.log(`====== End ${t} =======`)
+    })
+}
+
+function testBenchmark(){
+    const child_process = require('child_process');
+
+    let gor = init();
+    gor.on("message", function(){
+    });
+
+    gor.on("request", function(){
+    });
+
+    for (var i = 0; i<256; i++) {
+        let req = parseMessage(Buffer.from("1 2 3\nGET / HTTP/1.1\r\n\r\n").toString('hex'));
+        req.ID = +Date.now()
+        gor.emit(req);
+
+        gor.on("request", req.ID+"", function(){
+            gor.on("response", req.ID+"", function(){
+            })
+        })
+
+        if ( i % 3 == 0 ) {
+            let resp = parseMessage(Buffer.from("2 2 3\nHTTP/1.1 200 OK\r\n\r\n").toString('hex'));
+            resp.ID = req.ID
+            gor.emit(resp);
+        }
+    }
+    
+    child_process.execSync("sleep 0.01");
+
+    gor.gc(1) 
+    
+    fail(JSON.stringify(gor.ch))
+}
+
+// Just print in red color
+function fail(message) {
+    console.error("\x1b[31m[MIDDLEWARE] %s\x1b[0m", message)
+}
+
+function log(message) {
+    console.error(message)
+}
+
+function TEST_init() {
+    const child_process = require('child_process');
+
+    let received = 0;
+    let gor = init();
+    gor.on("message", function(){
+        received++; // should be called 3 times for for every request
+    });
+
+    gor.on("request", function(){
+        received++; // should be called 1 time only for request
+    });
+
+    gor.on("response", "2", function(){
+        received++; // should be called 1 time only for specific response
+    })
+
+    if (Object.keys(gor.ch).length != 3) {
+        return fail("Should create 3 channels");
+    }
+
+    let req = parseMessage(Buffer.from("1 2 3\nGET / HTTP/1.1\r\n\r\n").toString('hex'));
+    let resp = parseMessage(Buffer.from("2 2 3\nHTTP/1.1 200 OK\r\n\r\n").toString('hex'));
+    let resp2 = parseMessage(Buffer.from("2 3 3\nHTTP/1.1 200 OK\r\n\r\n").toString('hex'));
+    
+    gor.emit(req);
+    gor.emit(resp);
+    gor.emit(resp2);
+
+    child_process.execSync("sleep 0.01");
+
+    if (received != 5) {
+        fail(`Should receive 5 messages: ${received}`);
+    }
+}
+
+function TEST_filter() {
+    const child_process = require('child_process');
+
+    let gor = init();
+    gor.on("request", function(req){
+        if (httpPath(req.http) != "/filter") {
+            return req
+        }
+    });
+
+    gor.on("request", function(req){
+        return req
+    });
+
+
+    let reqPass = parseMessage(Buffer.from("1 2 3\nGET / HTTP/1.1\r\n\r\n").toString('hex'));
+    let reqFilter = parseMessage(Buffer.from("1 2 3\nGET /filter HTTP/1.1\r\n\r\n").toString('hex'));
+    
+    if (!gor.emit(reqPass)) {
+        return fail("Should not filter request")
+    }
+
+    if (gor.emit(reqFilter)) {
+        return fail("Should filter request even if one middleware rejected it")
+    }
+
+}
+
+function TEST_parseMessage() {
+    const exampleMessage = Buffer.from("1 2 3\nGET / HTTP/1.1\r\n\r\n").toString('hex')
+    let msg = parseMessage(exampleMessage)
+    let expected = { type: '1', ID: '2', meta: ["1", "2", "3"], http: Buffer.from("GET / HTTP/1.1\r\n\r\n") }
+
+    Object.keys(expected).forEach(function(k){
+        if (msg[k].toString() != expected[k].toString()) {
+            fail(`${k}: '${expected[k]}' != '${msg[k]}'`)
+        }
+    })
+}
+
+function TEST_httpPath() {
+    const examplePayload = "GET /test HTTP/1.1\r\n\r\n";
+
+    let payload = Buffer.from(examplePayload);
+    let path = httpPath(payload);
+
+    if (path != "/test") {
+        return fail(`Path '${patj}' != '/test'`)
+    }
+
+    let newPayload = setHttpPath(payload, '/')
+    if (newPayload.toString() != "GET / HTTP/1.1\r\n\r\n") {
+        return fail(`Malformed payload '${newPayload}'`)
+    }
+
+    newPayload = setHttpPath(payload, '/bigger')
+    if (newPayload.toString() != "GET /bigger HTTP/1.1\r\n\r\n") {
+        return fail(`Malformed payload '${newPayload}'`)
+    }
+}
+
+function TEST_httpMethod() {
+    const examplePayload = "GET /test HTTP/1.1\r\n\r\n";
+
+    let payload = Buffer.from(examplePayload);
+    let method = httpMethod(payload);
+
+    if (method != "GET") {
+        return fail(`Path '${method}' != 'GET'`)
+    }
+}
+
+
+function TEST_httpPathParam() {
+    let p = Buffer.from("GET / HTTP/1.1\r\n\r\n");
+
+    if (httpPathParam(p, "test")) {
+        return fail("Should not found param")
+    }
+
+    p = setHttpPathParam(p, "test", "123");
+    if (httpPath(p) != "/?test=123") {
+        return fail("Should set first param: " + httpPath(p));
+    }
+
+    if (httpPathParam(p, "test") != "123") {
+        return fail("Should get first param: " + httpPathParam(p, "test"));
+    }
+
+    p = setHttpPathParam(p, "qwer", "ty");
+    if (httpPath(p) != "/?test=123&qwer=ty") {
+        return fail("Should set second param: " + httpPath(p));
+    }
+
+    p = setHttpPathParam(p, "test", "4321");
+    if (httpPath(p) != "/?test=4321&qwer=ty") {
+        return fail("Should update first param: " + httpPath(p));
+    }
+
+    if (httpPathParam(p, "test") != "4321") {
+        return fail("Should update first param: " + httpPath(p));
+    }
+}
+
+function TEST_httpBodyParam() {
+    let p = Buffer.from("POST / HTTP/1.1\r\n\r\n");
+
+    if (httpBodyParam(p, "test")) {
+        return fail("Should not found param")
+    }
+
+    p = setHttpBodyParam(p, "test", "123");
+    if (httpBody(p).toString() != "test=123") {
+        return fail("Should set first param: " + httpBody(p).toString());
+    }
+
+    if (httpBodyParam(p, "test") != "123") {
+        return fail("Should get first param: " + httpBodyParam(p, "test"));
+    }
+
+    p = setHttpBodyParam(p, "qwer", "ty");
+    if (httpBody(p).toString() != "test=123&qwer=ty") {
+        return fail("Should set second param: " + httpBody(p).toString());
+    }
+
+    p = setHttpBodyParam(p, "test", "4321");
+    if (httpBody(p).toString() != "test=4321&qwer=ty") {
+        return fail("Should update first param: " + httpBody(p).toString());
+    }
+
+    if (httpBodyParam(p, "test") != "4321") {
+        return fail("Should update first param: " + httpBody(p).toString());
+    }
+}
+
+function TEST_httpHeader() {
+    const examplePayload = "GET / HTTP/1.1\r\nHost: localhost:3000\r\nUser-Agent: Node\r\nContent-Length:5\r\n\r\nhello";
+
+    let expected = {"Host": "localhost:3000", "User-Agent": "Node", "Content-Length": "5"}
+
+    Object.keys(expected).forEach(function(name){
+        let payload = Buffer.from(examplePayload);
+        let header = httpHeader(payload, name);
+        if (!header) {
+            fail(`Header not found. Was looking for: ${name}`)
+        }
+        if (header && header.value != expected[name]) {
+            fail(`${name}: '${expected[name]}' != '${header.value}'`)
+        }
+    })
+}
+
+
+function TEST_setHttpHeader() {
+    const examplePayload = "GET / HTTP/1.1\r\nUser-Agent: Node\r\nContent-Length: 5\r\n\r\nhello";
+
+    // Modify existing header
+    ["", "1", "Long test header"].forEach(function(ua){
+        let expected = `GET / HTTP/1.1\r\nUser-Agent: ${ua}\r\nContent-Length: 5\r\n\r\nhello`;
+        let p = Buffer.from(examplePayload);
+        p = setHttpHeader(p, "User-Agent", ua);
+        if (p != expected) {
+            console.error(`setHeader failed, expected User-Agent value: ${ua}.\n${p}`)
+        }
+    })
+
+    // Adding new header
+    let expected = `GET / HTTP/1.1\r\nX-Test: test\r\nUser-Agent: Node\r\nContent-Length: 5\r\n\r\nhello`;
+    let p = Buffer.from(examplePayload);
+    p = setHttpHeader(p, "X-Test", "test");
+    if (p != expected) {
+        console.error(`setHeader failed, expected new header 'X-Test' header: ${p}`)
+    }
+}
+
+function TEST_deleteHttpHeader() {
+    const examplePayload = "GET / HTTP/1.1\r\nUser-Agent: Node\r\nContent-Length: 5\r\n\r\nhello";
+
+    // Adding new header
+    let expected = `GET / HTTP/1.1\r\nContent-Length: 5\r\n\r\nhello`;
+    let p = Buffer.from(examplePayload);
+    p = deleteHttpHeader(p, "User-Agent", "test");
+    if (p != expected) {
+        console.error(`setHeader failed, expected delete header 'User-Agent' header: ${p}`)
+    }
+}
+
+function TEST_httpBody() {
+    const examplePayload = "GET / HTTP/1.1\r\nUser-Agent: Node\r\nContent-Length: 5\r\n\r\nhello";
+    let body = httpBody(Buffer.from(examplePayload));
+    if (body != "hello") {
+        fail(`'${body}' != 'hello'`)
+    }
+
+    const exampleInvalidPayload = "Invalid HTTP Response by Network issue";
+    let invalidBody = httpBody(Buffer.from(exampleInvalidPayload));
+    if (invalidBody != null) {
+        fail(`'${invalidBody}' != 'null'`)
+    }
+}
+
+function TEST_setHttpBody() {
+    const examplePayload = "GET / HTTP/1.1\r\nUser-Agent: Node\r\nContent-Length: 5\r\n\r\nhello";
+    let p = setHttpBody(Buffer.from(examplePayload), Buffer.from("hello, world!"));
+
+    if (p != "GET / HTTP/1.1\r\nUser-Agent: Node\r\nContent-Length: 13\r\n\r\nhello, world!") {
+        fail(`Wrong body: '${p}'`)
+    }
+}
+
+function TEST_httpCookie() {
+    const examplePayload = "GET / HTTP/1.1\r\nCookie: a=b; test=zxc\r\n\r\n";
+    let c = httpCookie(Buffer.from(examplePayload), "test");
+    if (c != "zxc") {
+        return fail(`Should get cookie: ${c}`);
+    }
+
+    c = httpCookie(Buffer.from(examplePayload), "nope");
+    if (c != null) {
+        return fail(`Should not find cookie: ${c}`);
+    }
+}
+
+function TEST_setHttpCookie() {
+    const examplePayload = "GET / HTTP/1.1\r\nCookie: a=b; test=zxc\r\n\r\n";
+    let p = setHttpCookie(Buffer.from(examplePayload), "test", "1");
+    if (p != "GET / HTTP/1.1\r\nCookie: a=b; test=1\r\n\r\n") {
+        return fail(`Should update cookie: ${p}`)
+    }
+
+    p = setHttpCookie(Buffer.from(examplePayload), "new", "one");
+    if (p != "GET / HTTP/1.1\r\nCookie: a=b; test=zxc; new=one\r\n\r\n") {
+        return fail(`Should add new cookie: ${p}`)
+    }
+}
+
+function TEST_deleteHttpCookie() {
+    const examplePayload = "GET / HTTP/1.1\r\nCookie: a=b; test=zxc\r\n\r\n";
+    let p = deleteHttpCookie(Buffer.from(examplePayload), "a");
+    if (p != "GET / HTTP/1.1\r\nCookie: test=zxc\r\n\r\n") {
+        return fail(`Should delete cookie: ${p}`)
+    }
+}
+
+
+function TEST_httpHeaders() {
+    const examplePayload = "GET / HTTP/1.1\r\nHost: localhost:3000\r\nUser-Agent: Node\r\nContent-Length:5\r\n\r\nhello";
+
+    let expectedHeaders = {"Host": "localhost:3000", "User-Agent": "Node", "Content-Length": "5"}
+    let payload = Buffer.from(examplePayload);
+    let headers = httpHeaders(payload);
+
+    ["Host", "User-Agent", "Content-Length"].forEach(function(header){
+        let actual = headers[header];
+        let expected = expectedHeaders[header];
+
+        if (!actual) {
+            fail(`${header} Header was not found`);
+        }
+
+        if (actual != expected) {
+            fail(`${header} Header not Equal to Expected: ${expected} was ${actual}`);
+        }
+
+    })
+}

middleware/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "goreplay_middleware",
+  "version": "1.0.0",
+  "description": "Package for writing middleware for GoReplay https://goreplay.org",
+  "main": "middleware.js",
+  "scripts": {
+    "test": "node -e \"var gor = require('./middleware.js'); gor.test(); process.exit()\"",
+    "benchmark": "node -e \"var gor = require('./middleware.js'); gor.benchmark(); process.exit()\""
+  },
+  "keywords": [
+    "middleware",
+    "goreplay"
+  ],
+  "author": "Leonid Bugaev",
+  "license": "LGPL-3.0"
+}