Merge branch 'master' into pr/406

Treat PATCH as a HTTP verb

.dockerignore

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

.gitignore

@@ -2,3 +2,21 @@
 *.gor
 
 *.out
+
+*.bin
+
+*.gz
+*.zip
+
+*.class
+
+*.test
+.idea
+*.iml
+gor
+
+*.mprof
+
+*.pcap
+
+.DS_Store

.gitmodules

@@ -0,0 +1,15 @@
+[submodule "vendor/github.com/mattbaird/elastigo"]
+	path = vendor/github.com/mattbaird/elastigo
+	url = https://github.com/mattbaird/elastigo
+[submodule "vendor/github.com/araddon/gou"]
+	path = vendor/github.com/araddon/gou
+	url = https://github.com/araddon/gou
+[submodule "vendor/github.com/bitly/go-hostpool"]
+	path = vendor/github.com/bitly/go-hostpool
+	url = https://github.com/bitly/go-hostpool
+[submodule "vendor/github.com/bmizerany/assert"]
+	path = vendor/github.com/bmizerany/assert
+	url = https://github.com/bmizerany/assert
+[submodule "vendor/github.com/google/gopacket"]
+	path = vendor/github.com/google/gopacket
+	url = https://github.com/google/gopacket

.travis.yml

@@ -1,3 +1,6 @@
-language: go 
-go: 1.3.3
-script: sudo -E bash -c "source /etc/profile && eval '$(gimme 1.4)' && export GOPATH=$HOME/gopath:$GOPATH && go get && GORACE='halt_on_error=1' go test -race -v"
+language: go
+go: 1.6
+script: sudo -E bash -c "source /etc/profile && eval '$(gimme 1.6)' && export GOPATH=$HOME/gopath:$GOPATH && go get && GORACE='halt_on_error=1' go test ./... -v -timeout 120s -race"
+
+before_install:
+  - sudo apt-get install libpcap-dev -y

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 +1,93 @@
+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.
+
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+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.
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+
+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/gor/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.
+
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+
+In no event will GoReplay LLC 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 GoReplay LLC has been advised of the possibility of such damages.
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+
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+
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+13. Miscellaneous
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Dockerfile

@@ -1,9 +1,24 @@
-FROM google/golang
+FROM golang:latest
 
-RUN cd /goroot/src/ && GOOS=linux GOARCH=386 ./make.bash --no-clean
+RUN apt-get update && apt-get install ruby vim-common -y
 
-WORKDIR /gopath/src/github.com/buger/gor/
+# Install Java for middleware testing
+RUN echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main" | tee /etc/apt/sources.list.d/webupd8team-java.list
+RUN echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main" | tee -a /etc/apt/sources.list.d/webupd8team-java.list
+RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886
+RUN apt-get update -y
+RUN echo oracle-java7-installer shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections
+RUN apt-get install oracle-java8-installer -y
 
-ADD . /gopath/src/github.com/buger/gor/
+RUN apt-get install flex bison -y
+RUN 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
+RUN go get github.com/google/gopacket
+RUN go get -u github.com/golang/lint/golint
 
+WORKDIR /go/src/github.com/buger/gor/
+ADD . /go/src/github.com/buger/gor/
+
+RUN wget http://archive.apache.org/dist/commons/io/binaries/commons-io-2.4-bin.tar.gz && tar xzf commons-io-2.4-bin.tar.gz && cd commons-io-2.4 && mv commons-io-2.4.jar /tmp/
+RUN wget http://archive.apache.org/dist/commons/codec/binaries/commons-codec-1.9-bin.tar.gz && tar xzf commons-codec-1.9-bin.tar.gz
+RUN javac -cp commons-io-2.4/commons-io-2.4.jar -cp commons-codec-1.9/commons-codec-1.9.jar ./examples/middleware/echo.java
 RUN go get

LICENSE.txt

@@ -1,191 +1,19 @@
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-Version 2.0, January 2004
-http://www.apache.org/licenses/
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-   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

@@ -1,37 +1,92 @@
-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 input_http.go output_http.go output_tcp.go plugins.go settings.go test_input.go elasticsearch.go http_modifier.go http_modifier_settings.go http_client.go
+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_null.go output_file.go input_http.go output_http.go output_tcp.go plugins.go settings.go test_input.go elasticsearch.go http_modifier.go http_modifier_settings.go http_client.go middleware.go protocol.go output_file_settings.go output_kafka.go
+SOURCE_PATH = /go/src/github.com/buger/gor/
+PORT = 8000
+FADDR = :8000
+RUN = docker run -v `pwd`:$(SOURCE_PATH) -p 0.0.0.0:$(PORT):$(PORT) -i -t gor
+BENCHMARK = BenchmarkRAWInput
+TEST = TestRawListenerBench
+VERSION = DEV-$(shell date +%s)
+LDFLAGS = -ldflags "-X main.VERSION=$(VERSION) -extldflags \"-static\""
+MAC_LDFLAGS = -ldflags "-X main.VERSION=$(VERSION)"
+FADDR = ":8000"
 
-SOURCE_PATH = /gopath/src/github.com/buger/gor/
+release: release-x64 release-mac
 
-release: release-x86 release-x64
+release-bin:
+	docker run -v `pwd`:$(SOURCE_PATH) -t --env GOOS=linux --env GOARCH=amd64  -i gor go build -tags netgo $(LDFLAGS)
 
 release-x64:
-	docker run -v `pwd`:$(SOURCE_PATH) -t --env GOOS=linux --env GOARCH=amd64 --env CGO_ENABLED=0 -i gor go build && tar -czf gor_x64.tar.gz gor && rm gor
+	docker run -v `pwd`:$(SOURCE_PATH) -t --env GOOS=linux --env GOARCH=amd64  -i gor go build -tags netgo $(LDFLAGS) && tar -czf gor_$(VERSION)_x64.tar.gz gor && rm gor
 
 release-x86:
-	docker run -v `pwd`:$(SOURCE_PATH) -t --env GOOS=linux --env GOARCH=386 --env CGO_ENABLED=0 -i gor go build && tar -czf gor_x86.tar.gz gor && rm gor
+	docker run -v `pwd`:$(SOURCE_PATH) -t --env GOOS=linux --env GOARCH=386 -i gor go build -tags netgo $(LDFLAGS) && tar -czf gor_$(VERSION)_x86.tar.gz gor && rm gor
 
-dbuild:
+release-mac:
+	go build $(MAC_LDFLAGS) && tar -czf gor_$(VERSION)_mac.tar.gz gor && rm gor
+
+build:
 	docker build -t gor .
 
-dtest:
-	docker run -v `pwd`:$(SOURCE_PATH) -t -i --env GORACE="halt_on_error=1" gor go test ./... $(ARGS) -race -v -timeout 15s
 
-dcover:
-	docker run -v `pwd`:$(SOURCE_PATH) -t -i --env GORACE="halt_on_error=1" gor go test $(ARGS) -race -v -timeout 15s -coverprofile=coverage.out
+profile:
+	go build && ./gor --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 60s $(LDFLAGS) $(ARGS)  -v
+
+test_all:
+	$(RUN) go test ./... -timeout 60s $(LDFLAGS) $(ARGS) -v
+
+testone:
+	$(RUN) go test ./... -timeout 4s $(LDFLAGS) -run $(TEST) $(ARGS) -v
+
+cover:
+	$(RUN) go test $(ARGS) -race -v -timeout 15s -coverprofile=coverage.out
 	go tool cover -html=coverage.out
 
-dfmt:
-	docker run -v `pwd`:$(SOURCE_PATH) -t -i gor go fmt
+fmt:
+	$(RUN) gofmt -w -s ./..
 
-dvet:
-	docker run -v `pwd`:$(SOURCE_PATH) -t -i gor go vet
+vet:
+	$(RUN) go vet
 
-dbench:
-	docker run -v `pwd`:$(SOURCE_PATH) -t -i gor go test -v -run NOT_EXISTING -bench HTTP
+bench:
+	$(RUN) go test $(LDFLAGS) -v -run NOT_EXISTING -bench $(BENCHMARK) -benchtime 5s
+
+profile_test:
+	$(RUN) go test $(LDFLAGS) -run $(TEST) ./raw_socket_listener/. $(ARGS) -memprofile mem.mprof -cpuprofile cpu.out
+	$(RUN) go test $(LDFLAGS) -run $(TEST) ./raw_socket_listener/. $(ARGS) -c
 
 # Used mainly for debugging, because docker container do not have access to parent machine ports
-drun:
-	docker run -v `pwd`:$(SOURCE_PATH) -t -i gor go run $(SOURCE) --input-dummy=0 --output-http="http://localhost:9000"  --verbose -h
+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 --debug --middleware "./examples/middleware/echo.sh" --output-file requests.gor
 
-dbash: 
-	docker run -v `pwd`:$(SOURCE_PATH) -t -i gor /bin/bash
+run-2:
+	sudo -E go run $(SOURCE) --input-dummy="" --output-tcp localhost:27001 --verbose --debug
+
+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-engine pcap_file --output-null
+
+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

README.md

@@ -1,383 +1,48 @@
-[![Build Status](https://travis-ci.org/buger/gor.png?branch=master)](https://travis-ci.org/buger/gor)
+[![GitHub release](https://img.shields.io/github/release/buger/gor.svg?maxAge=3600)](https://github.com/buger/gor/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)
+
+![Go Replay](http://i.imgur.com/ZG2ki5n.png)
+
+## https://goreplay.org/
 
 ## 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.
+GoReplay is the simplest and safest way to test your app using real traffic before you put it into production.
+
+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 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 changes and infrastructure changes. Did we mention that no coding is required?
 
 
-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)
 
+Check [latest documentation](http://github.com/buger/gor/wiki).
 
-## Examples
+## Installation
+Download latest binary from https://github.com/buger/gor/releases or [compile by yourself](https://github.com/buger/gor/wiki/Compilation).
 
-### 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
+## Getting started
 
-# Replay server (replay.local).
-gor --input-tcp replay.local:28020 --output-http http://staging.com
-```
+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`.
 
-Since Gor use raw sockets to capture traffic it require `sudo` access. Alternatively you can allow access to raw sockets like this: `sudo setcap CAP_NET_RAW=ep gor`
+See the our [documentation](https://github.com/buger/gor/wiki/) and [Getting started](https://github.com/buger/gor/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.
 
-### 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"
-```
+## Want to Upgrade?
 
-### Guarantee of replay and HTTP input
-Due to how traffic interception works, there is chance of missing requests. If you want guarantee that requests will be replayed you can use http input, but it will require changes in your app as well. 
+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. 
 
-```
-sudo gor --input-http :28019 --output-http "http://staging.com"
-```
 
-Then in your application you should send copy (e.g. like reverse proxy) all incoming requests to Gor http input. 
+## Problems?
+If you have a problem, please review the [FAQ](https://github.com/buger/gor/wiki/FAQ) and [Troubleshooting](https://github.com/buger/gor/wiki/Troubleshooting) wiki pages. Searching the [issues](https://github.com/buger/gor/issues) for your problem is also a good idea.
 
-## Configuration
-
-### 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
-```
-
-### HTTP output workers
-By default Gor creates dynamic pull of workers: it starts with 10 and 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.  
-You may specify fixed number of workers using  `--output-http-workers=20` option.
-
-### Follow redirects
-By default Gor will ignore all redirects since they are handled by clients using your app, but in scenarios when your replayed environment introduce 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.
-
-### Rate limiting
-Rate limiting can be useful if you want forward only part of production traffic and not overload your staging environment. There is 2 strategies: dropping random requests or dropping fraction of requests based on Header or URL param value. 
-
-#### Dropping random requests
-Every input and output support random rate limiting.
-There are 2 limiting algorithms: absolute or percentage based. 
-
-Absolute: If for current second it reached specified requests limit - disregard the rest, on next second counter reseted.
-
-Percentage: For input-file it will slowdown or speedup request execution, for the rest it will use random generator to decide if request pass or not based on chance you specified. 
-
-You can specify your desired limit using the
-"|" operator after the server address:
-
-#### Limiting replay using absolute number
-```
-# staging.server will not get more than 10 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%"
-```
-
-#### 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 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%"
-```
-Only percentage based limiting supported.
-
-### Filtering 
-
-#### 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
-```
-
-#### 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
-```
-
-### Rewriting original request
-Gor supports built-in basic rewriting support, for complex logic see https://github.com/buger/gor/pull/162
-
-#### Rewrite URL based on a mapping
-```
-# rewrite url to match the following
-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. 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" \
-    --http-header "User-Agent: Replayed by Gor" \
-    --http-header "Enable-Feature-X: true"
-```
-
-### Saving requests to file and replaying them
-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.
-
-### Load testing
-
-Currently it 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 unlike examples above limiter is applied to input:
-
-```
-# Replay from file on 2x speed 
-gor --input-file "requests.gor|200%" --output-http "staging.com"
-```
-
-### 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.
-
-
-## Stats 
-
-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
-```
-
-```
-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
-```
-
-### 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.
-
-### 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:
-```
-  -http-allow-header=[]: A regexp to match a specific header against. Requests with non-matching headers will be dropped:
-   gor --input-raw :8080 --output-http staging.com --http-allow-header api-version:^v1
-  -http-allow-method=[]: Whitelist of HTTP methods to replay. Anything else will be dropped:
-  gor --input-raw :8080 --output-http staging.com --http-allow-method GET --http-allow-method OPTIONS
-  -http-allow-url=[]: A regexp to match requests against. Filter get matched agains full url with domain. Anything else will be dropped:
-   gor --input-raw :8080 --output-http staging.com --http-allow-url ^www.
-  -http-diallow-url=[]: A regexp to match requests against. Filter get matched agains full url with domain. Anything else will be dropped:
-   gor --input-raw :8080 --output-http staging.com --http-disallow-url ^www.
-  -http-header-limiter=[]: Takes a fraction of requests, consistently taking or rejecting a request based on the FNV32-1A hash of a specific header:
-   gor --input-raw :8080 --output-http staging.com --http-header-imiter user-id:25%
-  -http-param-limiter=[]: Takes a fraction of requests, consistently taking or rejecting a request based on the FNV32-1A hash of a specific GET param:
-   gor --input-raw :8080 --output-http staging.com --http-param-limiter user_id:25%
-  -http-rewrite-url=[]: Rewrite the request url based on a mapping:
-  gor --input-raw :8080 --output-http staging.com --http-rewrite-url /v1/user/([^\/]+)/ping:/v2/user/$1/ping
-  -http-set-header=[]: Inject additional headers to http reqest:
-  gor --input-raw :8080 --output-http staging.com --http-set-header 'User-Agent: Gor'
-  -http-set-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
-  -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-http=[]: Read requests from HTTP, should be explicitly sent from your application:
-  # Listen for http on 9000
-  gor --input-http :9000 --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
-  -memprofile="": write memory profile to this file
-  -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-filter=[]: WARNING: `--output-http-header-filter` DEPRECATED, use `--http-allow-header` instead  -output-http-redirects=0: Enable how often redirects should be followed.
-  -output-http-stats=false: Report http output queue stats to console every 5 seconds.
-  -output-http-workers=0: Gor uses dynamic worker scaling by default.  Enter a number to run a set number of workers.
-  -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: Report TCP output queue stats to console every 5 seconds.
-  -split-output=false: By default each output gets same traffic. If set to `true` it splits traffic equally among all outputs.
-  -stats=false: Turn on queue stats output
-  -verbose=false: Turn on verbose/debug output
-```
-
-## 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 all tests: `make dtest`. Run specific test: `make dtest ARGS=-test.run=**regexp**`
-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.
-
-### 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
-
-### 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
-
-### 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.
-
-## 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
+All bug-reports and suggestions should go though 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
@@ -390,11 +55,19 @@ To achieve the top most performance you should tune the source server system lim
 
 ## 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/)
-* [3SCALE](http://www.3scale.net/)
-* [Optionlab](http://www.opinionlab.com)
-* [TubeMogul] (http://tubemogul.com)
-* To add your company drop me a line to github.com/buger or leonsbox@gmail.com
+* [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 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

@@ -1,37 +1,40 @@
+// Package byteutils probvides helpers for working with byte slices
 package byteutils
 
+// 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]
+	copy(a[from:], a[to:])
+	a = a[:len(a)-to+from]
 
-    return a
+	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)
+	a = append(a, make([]byte, len(b))...)
+	copy(a[i+len(b):], a[i:])
+	copy(a[i:i+len(b)], b)
 
-    return a
+	return a
 }
 
-// Unlike bytes.Replace it allows you to specify range
+// 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)
+	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)
+	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
-    } else if lenDiff < 0 {
-        copy(a[from:], new)
-        copy(a[from+len(new):],a[to:])
-        return a[:len(a) + lenDiff]
-    } else { // same size
-        copy(a[from:], new)
-        return a
-    }
-}
+		return a
+	} else if lenDiff < 0 {
+		copy(a[from:], new)
+		copy(a[from+len(new):], a[to:])
+		return a[:len(a)+lenDiff]
+	} else { // same size
+		copy(a[from:], new)
+		return a
+	}
+}

byteutils/byteutils_test.go

@@ -1,32 +1,32 @@
 package byteutils
 
 import (
-    "testing"
-    "bytes"
+	"bytes"
+	"testing"
 )
 
 func TestCut(t *testing.T) {
-    if !bytes.Equal(Cut([]byte("123456"), 2, 4), []byte("1256")) {
-        t.Error("Should properly cut")
-    }
+	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")
-    }
+	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("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, 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")
-    }
-}
+	if !bytes.Equal(Replace([]byte("123456"), 2, 5, []byte("ab")), []byte("12ab6")) {
+		t.Error("Should replace when replacement length bigger")
+	}
+}

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"

elasticsearch.go

@@ -2,9 +2,8 @@ package main
 
 import (
 	"encoding/json"
-	"github.com/buger/elastigo/api"
-	"github.com/buger/elastigo/core"
 	"github.com/buger/gor/proto"
+	"github.com/mattbaird/elastigo/lib"
 	"log"
 	"regexp"
 	"time"
@@ -19,33 +18,34 @@ func (e *ESUriErorr) Error() string {
 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               []byte `json:"Req_URL"`
-	ReqMethod            []byte `json:"Req_Method"`
-	ReqUserAgent         []byte `json:"Req_User-Agent"`
-	ReqAcceptLanguage    []byte `json:"Req_Accept-Language,omitempty"`
-	ReqAccept            []byte `json:"Req_Accept,omitempty"`
-	ReqAcceptEncoding    []byte `json:"Req_Accept-Encoding,omitempty"`
-	ReqIfModifiedSince   []byte `json:"Req_If-Modified-Since,omitempty"`
-	ReqConnection        []byte `json:"Req_Connection,omitempty"`
-	ReqCookies           []byte `json:"Req_Cookies,omitempty"`
-	RespStatus           []byte `json:"Resp_Status"`
-	RespStatusCode       []byte `json:"Resp_Status-Code"`
-	RespProto            []byte `json:"Resp_Proto,omitempty"`
-	RespContentLength    []byte `json:"Resp_Content-Length,omitempty"`
-	RespContentType      []byte `json:"Resp_Content-Type,omitempty"`
-	RespTransferEncoding []byte `json:"Resp_Transfer-Encoding,omitempty"`
-	RespContentEncoding  []byte `json:"Resp_Content-Encoding,omitempty"`
-	RespExpires          []byte `json:"Resp_Expires,omitempty"`
-	RespCacheControl     []byte `json:"Resp_Cache-Control,omitempty"`
-	RespVary             []byte `json:"Resp_Vary,omitempty"`
-	RespSetCookie        []byte `json:"Resp_Set-Cookie,omitempty"`
+	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
 }
@@ -76,24 +76,26 @@ func (p *ESPlugin) Init(URI string) {
 	if err != nil {
 		log.Fatal("Can't initialize ElasticSearch plugin.", err)
 	}
+	p.eConn = elastigo.NewConn()
+	p.eConn.SetPort(p.ApiPort)
+	p.eConn.SetHosts([]string{p.Host})
 
-	api.Domain = p.Host
-	api.Port = p.ApiPort
-
-	p.indexor = core.NewBulkIndexerErrors(50, 60)
+	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()
+	if Settings.verbose {
+		// Only start the ErrorHandler goroutine when in verbose mode
+		// no need to burn ressources otherwise
+		go p.ErrorHandler()
+	}
 
 	log.Println("Initialized Elasticsearch Plugin")
 	return
 }
 
 func (p *ESPlugin) IndexerShutdown() {
-	p.done <- true
+	p.indexor.Stop()
 	return
 }
 
@@ -118,28 +120,29 @@ func (p *ESPlugin) ResponseAnalyze(req, resp []byte, start, stop time.Time) {
 	}
 	t := time.Now()
 	rtt := p.RttDurationToMs(stop.Sub(start))
+	req = payloadBody(req)
 
 	esResp := ESRequestResponse{
-		ReqUrl:               proto.Path(req),
-		ReqMethod:            proto.Method(req),
-		ReqUserAgent:         proto.GetHeader(req, "User-Agent"),
-		ReqAcceptLanguage:    proto.GetHeader(req, "Accept-Language"),
-		ReqAccept:            proto.GetHeader(req, "Accept"),
-		ReqAcceptEncoding:    proto.GetHeader(req, "Accept-Encoding"),
-		ReqIfModifiedSince:   proto.GetHeader(req, "If-Modified-Since"),
-		ReqConnection:        proto.GetHeader(req, "Connection"),
-		ReqCookies:           proto.GetHeader(req, "Cookie"),
-		RespStatus:           proto.Status(resp),
-		RespStatusCode:       proto.Status(resp),
-		RespProto:            proto.Method(resp),
-		RespContentLength:    proto.GetHeader(resp, "Content-Length"),
-		RespContentType:      proto.GetHeader(resp, "Content-Type"),
-		RespTransferEncoding: proto.GetHeader(resp, "Transfer-Encoding"),
-		RespContentEncoding:  proto.GetHeader(resp, "Content-Encoding"),
-		RespExpires:          proto.GetHeader(resp, "Expires"),
-		RespCacheControl:     proto.GetHeader(resp, "Cache-Control"),
-		RespVary:             proto.GetHeader(resp, "Vary"),
-		RespSetCookie:        proto.GetHeader(resp, "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,
 	}
@@ -147,7 +150,7 @@ func (p *ESPlugin) ResponseAnalyze(req, resp []byte, start, stop time.Time) {
 	if err != nil {
 		log.Println(err)
 	} else {
-		p.indexor.Index(p.Index, "RequestResponse", "", "", &t, j, true)
+		p.indexor.Index(p.Index, "RequestResponse", "", "", "", &t, j)
 	}
 	return
 }

emitter.go

@@ -1,41 +1,96 @@
 package main
 
 import (
+	"bytes"
 	"io"
 	"time"
 )
 
+// Start initialize loop for sending data from inputs to outputs
 func Start(stop chan int) {
-	for _, in := range Plugins.Inputs {
-		go CopyMulty(in, Plugins.Outputs...)
+	if Settings.middleware != "" {
+		middleware := NewMiddleware(Settings.middleware)
+
+		for _, in := range Plugins.Inputs {
+			middleware.ReadFrom(in)
+		}
+
+		// We are going only to read responses, so using same ReadFrom method
+		for _, out := range Plugins.Outputs {
+			if r, ok := out.(io.Reader); ok {
+				middleware.ReadFrom(r)
+			}
+		}
+
+		go CopyMulty(middleware, Plugins.Outputs...)
+	} else {
+		for _, in := range Plugins.Inputs {
+			go CopyMulty(in, Plugins.Outputs...)
+		}
 	}
 
 	for {
 		select {
 		case <-stop:
+			finalize()
 			return
-		case <-time.After(1 * time.Second):
+		case <-time.After(100 * time.Millisecond):
 		}
 	}
 }
 
-// Copy from 1 reader to multiple writers
+// CopyMulty copies from 1 reader to multiple writers
 func CopyMulty(src io.Reader, writers ...io.Writer) (err error) {
 	buf := make([]byte, 5*1024*1024)
 	wIndex := 0
 	modifier := NewHTTPModifier(&Settings.modifierConfig)
+	filteredRequests := make(map[string]time.Time)
+	filteredRequestsLastCleanTime := time.Now()
+
+	i := 0
 
 	for {
 		nr, er := src.Read(buf)
+
 		if nr > 0 && len(buf) > nr {
-			payload := buf[0:nr]
+			payload := buf[:nr]
+			meta := payloadMeta(payload)
+			requestID := string(meta[1])
+
+			_maxN := nr
+			if nr > 500 {
+				_maxN = 500
+			}
+
+			if Settings.debug {
+				Debug("[EMITTER] input:", string(payload[0:_maxN]), nr, "from:", src)
+			}
 
 			if modifier != nil {
-				payload = modifier.Rewrite(payload)
+				if isRequestPayload(payload) {
+					headSize := bytes.IndexByte(payload, '\n') + 1
+					body := payload[headSize:]
+					originalBodyLen := len(body)
+					body = modifier.Rewrite(body)
 
-				// If modifier tells to skip request
-				if len(payload) == 0 {
-					continue
+					// If modifier tells to skip request
+					if len(body) == 0 {
+						filteredRequests[requestID] = time.Now()
+						continue
+					}
+
+					if originalBodyLen != len(body) {
+						payload = append(payload[:headSize], body...)
+					}
+
+					if Settings.debug {
+						Debug("[EMITTER] Rewritten input:", len(payload), "First 500 bytes:", string(payload[0:_maxN]))
+					}
+				} else {
+					if _, ok := filteredRequests[requestID]; ok {
+						delete(filteredRequests, requestID);
+						continue
+					}
 				}
 			}
 
@@ -62,6 +117,23 @@ func CopyMulty(src io.Reader, writers ...io.Writer) (err error) {
 			err = er
 			break
 		}
+
+		// Run GC on each 1000 request
+		if i % 1000 == 0 {
+			// Clean up filtered requests for which we didn't get a response to filter
+			now := time.Now()
+			if now.Sub(filteredRequestsLastCleanTime) > 60 * time.Second {
+				for k, v := range filteredRequests {
+					if now.Sub(v) > 60 * time.Second {
+						delete(filteredRequests, k)
+					}
+				}
+				filteredRequestsLastCleanTime = time.Now()
+			}
+		}
+
+		i++
 	}
+
 	return err
 }

emitter_test.go

@@ -5,6 +5,7 @@ import (
 	"sync"
 	"sync/atomic"
 	"testing"
+	"time"
 )
 
 func TestEmitter(t *testing.T) {
@@ -31,6 +32,51 @@ func TestEmitter(t *testing.T) {
 	close(quit)
 }
 
+func TestEmitterFiltered(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+	input.skipHeader = true
+
+	output := NewTestOutput(func(data []byte) {
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+	methods := HTTPMethods{[]byte("GET")}
+	Settings.modifierConfig = HTTPModifierConfig{methods: methods}
+
+	go Start(quit)
+
+	wg.Add(2)
+
+	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)
+
+	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)
+
+	wg.Wait()
+
+	close(quit)
+}
+
 func TestEmitterRoundRobin(t *testing.T) {
 	wg := new(sync.WaitGroup)
 	quit := make(chan int)

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.rb

@@ -0,0 +1,22 @@
+#!/usr/bin/env ruby
+# encoding: utf-8
+while data = STDIN.gets # continiously read line from STDIN
+  next unless data
+  data = data.chomp # remove end of line symbol
+  
+  decoded = [data].pack("H*") # decode base64 encoded request
+  
+  # dedoded 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 +1,46 @@
+#!/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 {
+    # Logging to stderr, because stdout/stdin used for data transfer
+    >&2 echo "[DEBUG][ECHO] $1"
+}
+
+while read line; do
+    decoded=$(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 +1,119 @@
+/*
+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"
+	"github.com/buger/gor/proto"
+	"os"
+)
+
+// 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{}) {
+	fmt.Fprint(os.Stderr, "[DEBUG][TOKEN-MOD] ")
+	fmt.Fprintln(os.Stderr, args...)
+}

gor.go

@@ -5,10 +5,16 @@ package main
 import (
 	"flag"
 	"fmt"
+	"io"
 	"log"
+	"net/http"
+	"net/http/httputil"
 	"os"
-	"runtime/debug"
+	"os/signal"
+	"runtime"
+	_ "runtime/debug"
 	"runtime/pprof"
+	"syscall"
 	"time"
 )
 
@@ -18,21 +24,44 @@ var (
 	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())
-			}
+	// // Don't exit on panic
+	// defer func() {
+	// 	if r := recover(); r != nil {
+	// 		fmt.Printf("PANIC: pkg: %v %s \n", r, debug.Stack())
+	// 	}
+	// }()
+
+	// If not set via env cariable
+	if len(os.Getenv("GOMAXPROCS")) == 0 {
+		runtime.GOMAXPROCS(runtime.NumCPU() * 2)
+	}
+
+	args := os.Args[1:]
+	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()
+
+		log.Println("Started example file server for current dirrectory on address ", args[1])
+
+		log.Fatal(http.ListenAndServe(args[1], loggingMiddleware(http.FileServer(http.Dir(dir)))))
+	} else {
+		flag.Parse()
+		InitPlugins()
+	}
 
 	fmt.Println("Version:", VERSION)
 
-	flag.Parse()
-	InitPlugins()
-
 	if len(Plugins.Inputs) == 0 || len(Plugins.Outputs) == 0 {
 		log.Fatal("Required at least 1 input and 1 output")
 	}
@@ -45,7 +74,35 @@ func main() {
 		profileCPU(*cpuprofile)
 	}
 
-	Start(nil)
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+	go func() {
+		<-c
+		finalize()
+		os.Exit(1)
+	}()
+
+	if Settings.exitAfter > 0 {
+		log.Println("Running gor for a duration of", Settings.exitAfter)
+		closeCh := make(chan int)
+
+		time.AfterFunc(Settings.exitAfter, func() {
+			log.Println("Stopping gor after", Settings.exitAfter)
+			close(closeCh)
+		})
+
+		Start(closeCh)
+	} else {
+		Start(nil)
+	}
+}
+
+func finalize() {
+	for _, p := range Plugins.All {
+		if cp, ok := p.(io.Closer); ok {
+			cp.Close()
+		}
+	}
 }
 
 func profileCPU(cpuprofile string) {
@@ -56,10 +113,10 @@ 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")
+			log.Println("Stop profiling after 30 seconds")
 		})
 	}
 }
@@ -70,7 +127,7 @@ 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

@@ -2,6 +2,7 @@ package main
 
 import (
 	"log"
+	"runtime"
 	"strconv"
 	"time"
 )
@@ -27,7 +28,7 @@ func NewGorStat(statName string) (s *GorStat) {
 	s.count = 0
 
 	if Settings.stats {
-		log.Println(s.statName + ":latest,mean,max,count,count/second")
+		log.Println(s.statName + ":latest,mean,max,count,count/second,gcount")
 		go s.reportStats()
 	}
 	return
@@ -54,7 +55,7 @@ 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/rate) + "," + strconv.Itoa(runtime.NumGoroutine())
 }
 
 func (s *GorStat) reportStats() {

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_client.go

@@ -1,29 +1,51 @@
 package main
 
 import (
+	"bytes"
 	"crypto/tls"
-	"github.com/buger/gor/proto"
+	"encoding/base64"
 	"io"
+	"log"
 	"net"
 	"net/url"
+	"runtime/debug"
+	"strconv"
 	"strings"
+	"sync"
+	"syscall"
 	"time"
+
+	"github.com/buger/gor/proto"
 )
 
+var httpMu sync.Mutex
+
+const (
+	readChunkSize   = 64 * 1024
+	maxResponseSize = 1073741824
+)
+
+var chunkedSuffix = []byte("0\r\n\r\n")
+
 var defaultPorts = map[string]string{
 	"http":  "80",
 	"https": "443",
 }
 
 type HTTPClientConfig struct {
-	FollowRedirects int
-	Debug           bool
+	FollowRedirects    int
+	Debug              bool
+	OriginalHost       bool
+	ConnectionTimeout  time.Duration
+	Timeout            time.Duration
+	ResponseBufferSize int
 }
 
 type HTTPClient struct {
 	baseURL        string
 	scheme         string
 	host           string
+	auth           string
 	conn           net.Conn
 	respBuf        []byte
 	config         *HTTPClientConfig
@@ -36,27 +58,42 @@ func NewHTTPClient(baseURL string, config *HTTPClientConfig) *HTTPClient {
 	}
 
 	u, _ := url.Parse(baseURL)
-	if !strings.Contains(u.Host, ":") {
-		u.Host += ":" + defaultPorts[u.Scheme]
+
+	if config.Timeout == 0 {
+		config.Timeout = time.Second
+    }
+
+	config.ConnectionTimeout = config.Timeout
+
+	if config.ResponseBufferSize == 0 {
+		config.ResponseBufferSize = 100 * 1024 // 100kb
 	}
 
 	client := new(HTTPClient)
 	client.baseURL = u.String()
 	client.host = u.Host
 	client.scheme = u.Scheme
-	client.respBuf = make([]byte, 4096*10)
+	client.respBuf = make([]byte, config.ResponseBufferSize)
 	client.config = config
 
+	if u.User != nil {
+		client.auth = "Basic " + base64.StdEncoding.EncodeToString([]byte(u.User.String()))
+	}
+
 	return client
 }
 
 func (c *HTTPClient) Connect() (err error) {
 	c.Disconnect()
 
-	c.conn, err = net.Dial("tcp", c.host)
+	if !strings.Contains(c.host, ":") {
+		c.conn, err = net.DialTimeout("tcp", c.host + ":" + defaultPorts[c.scheme], c.config.ConnectionTimeout)
+	} else {
+		c.conn, err = net.DialTimeout("tcp", c.host, c.config.ConnectionTimeout)
+	}
 
 	if c.scheme == "https" {
-		tlsConn := tls.Client(c.conn, &tls.Config{InsecureSkipVerify: true})
+		tlsConn := tls.Client(c.conn, &tls.Config{InsecureSkipVerify: true, ServerName: c.host})
 
 		if err = tlsConn.Handshake(); err != nil {
 			return
@@ -72,7 +109,7 @@ func (c *HTTPClient) Disconnect() {
 	if c.conn != nil {
 		c.conn.Close()
 		c.conn = nil
-		Debug("Disconnected: ", c.baseURL)
+		Debug("[HTTP] Disconnected: ", c.baseURL)
 	}
 }
 
@@ -81,7 +118,17 @@ func (c *HTTPClient) isAlive() bool {
 
 	// Ready 1 byte from socket without timeout to check if it not closed
 	c.conn.SetReadDeadline(time.Now().Add(time.Millisecond))
-	if _, err := c.conn.Read(one); err == io.EOF {
+	_, err := c.conn.Read(one)
+
+	if err == nil {
+		return true
+	} else if err == io.EOF {
+		if c.config.Debug {
+			Debug("[HTTPClient] connection closed, reconnecting")
+		}
+		return false
+	} else if err == syscall.EPIPE {
+		Debug("Detected broken pipe.", err)
 		return false
 	}
 
@@ -89,38 +136,172 @@ func (c *HTTPClient) isAlive() bool {
 }
 
 func (c *HTTPClient) Send(data []byte) (response []byte, err error) {
+	// Don't exit on panic
+	defer func() {
+		if r := recover(); r != nil {
+			Debug("[HTTPClient]", r, string(data))
+
+			if _, ok := r.(error); !ok {
+				log.Println("[HTTPClient] Failed to send request: ", string(data))
+				log.Println("PANIC: pkg:", r, debug.Stack())
+			}
+		}
+	}()
+
 	if c.conn == nil || !c.isAlive() {
-		Debug("Connecting:", c.baseURL)
-		c.Connect()
+		Debug("[HTTPClient] Connecting:", c.baseURL)
+		if err = c.Connect(); err != nil {
+			log.Println("[HTTPClient] Connection error:", err)
+			response = errorPayload(HTTP_CONNECTION_ERROR)
+			return
+		}
 	}
 
-	timeout := time.Now().Add(5 * time.Second)
+	timeout := time.Now().Add(c.config.Timeout)
 
 	c.conn.SetWriteDeadline(timeout)
 
-	data = proto.SetHost(data, []byte(c.baseURL), []byte(c.host))
+	if !c.config.OriginalHost {
+		data = proto.SetHost(data, []byte(c.baseURL), []byte(c.host))
+	}
+
+	if c.auth != "" {
+		data = proto.SetHeader(data, []byte("Authorization"), []byte(c.auth))
+	}
 
 	if c.config.Debug {
-		Debug("Sending:", string(data))
+		Debug("[HTTPClient] Sending:", string(data))
 	}
 
 	if _, err = c.conn.Write(data); err != nil {
-		Debug("Write error:", err, c.baseURL)
+		Debug("[HTTPClient] Write error:", err, c.baseURL)
+		response = errorPayload(HTTP_TIMEOUT)
 		return
 	}
 
-	c.conn.SetReadDeadline(timeout)
-	n, err := c.conn.Read(c.respBuf)
+	var readBytes, n int
+	var currentChunk []byte
+	timeout = time.Now().Add(c.config.Timeout)
+	chunked := false
+	contentLength := -1
+	currentContentLength := 0
+	chunks := 0
+
+	for {
+		c.conn.SetReadDeadline(timeout)
+
+		if readBytes < len(c.respBuf) {
+			n, err = c.conn.Read(c.respBuf[readBytes:])
+			readBytes += n
+			chunks++
+
+			if err != nil {
+				if err == io.EOF {
+					err = nil
+				}
+				break
+			}
+
+			// First chunk
+			if chunked || contentLength != -1 {
+				currentContentLength += n
+			} else {
+				// If headers are finished
+				if bytes.Contains(c.respBuf[:readBytes], proto.EmptyLine) {
+					if bytes.Equal(proto.Header(c.respBuf, []byte("Transfer-Encoding")), []byte("chunked")) {
+						chunked = true
+					} else {
+						status, _ := strconv.Atoi(string(proto.Status(c.respBuf)))
+						if (status >= 100 && status < 200) || status == 204 || status == 304 {
+							contentLength = 0
+						} else {
+							l := proto.Header(c.respBuf, []byte("Content-Length"))
+							if len(l) > 0 {
+								contentLength, _ = strconv.Atoi(string(l))
+							}
+						}
+					}
+
+					currentContentLength += len(proto.Body(c.respBuf[:readBytes]))
+				}
+			}
+
+			if chunked {
+				// Check if chunked message finished
+				if bytes.HasSuffix(c.respBuf[:readBytes], chunkedSuffix) {
+					break
+				}
+			} else if contentLength != -1 {
+				if currentContentLength > contentLength {
+					Debug("[HTTPClient] disconnected, wrong length", currentContentLength, contentLength)
+					c.Disconnect()
+					break
+				} else if currentContentLength == contentLength {
+					break
+				}
+			}
+		} else {
+			if currentChunk == nil {
+				currentChunk = make([]byte, readChunkSize)
+			}
+
+			n, err = c.conn.Read(currentChunk)
+
+			if err == io.EOF {
+				break
+			} else if err != nil {
+				Debug("[HTTPClient] Read the whole body error:", err, c.baseURL)
+				break
+			}
+
+			readBytes += int(n)
+			chunks++
+			currentContentLength += n
+
+			if chunked {
+				// Check if chunked message finished
+				if bytes.HasSuffix(currentChunk[:n], chunkedSuffix) {
+					break
+				}
+			} else if contentLength != -1 {
+				if currentContentLength > contentLength {
+					Debug("[HTTPClient] disconnected, wrong length", currentContentLength, contentLength)
+					c.Disconnect()
+					break
+				} else if currentContentLength == contentLength {
+					break
+				}
+			} else {
+				Debug("[HTTPClient] disconnected, can't find Content-Length or Chunked")
+				c.Disconnect()
+				break
+			}
+		}
+
+		if readBytes >= maxResponseSize {
+			Debug("[HTTPClient] Body is more than the max size", maxResponseSize,
+				c.baseURL)
+			break
+		}
+
+		// For following chunks expect less timeout
+		timeout = time.Now().Add(c.config.Timeout / 5)
+	}
 
 	if err != nil {
-		Debug("READ ERRORR!", err, c.conn)
+		Debug("[HTTPClient] Response read error", err, c.conn, readBytes)
+		response = errorPayload(HTTP_TIMEOUT)
 		return
 	}
 
-	payload := c.respBuf[:n]
+	if readBytes > len(c.respBuf) {
+		readBytes = len(c.respBuf)
+	}
+	payload := make([]byte, readBytes)
+	copy(payload, c.respBuf[:readBytes])
 
 	if c.config.Debug {
-		Debug("Received:", string(payload))
+		Debug("[HTTPClient] Received:", string(payload))
 	}
 
 	if c.config.FollowRedirects > 0 && c.redirectsCount < c.config.FollowRedirects {
@@ -128,20 +309,64 @@ func (c *HTTPClient) Send(data []byte) (response []byte, err error) {
 
 		// 3xx requests
 		if status[0] == '3' {
-			c.redirectsCount += 1
+			c.redirectsCount++
 
-			location, _, _, _ := proto.Header(payload, []byte("Location"))
+			location := proto.Header(payload, []byte("Location"))
 			redirectPayload := []byte("GET " + string(location) + " HTTP/1.1\r\n\r\n")
 
 			if c.config.Debug {
-				Debug("Redirecting to: " + string(location))
+				Debug("[HTTPClient] Redirecting to: " + string(location))
 			}
 
 			return c.Send(redirectPayload)
 		}
 	}
 
+	if bytes.Equal(proto.Status(payload), []byte("400")) {
+		c.Disconnect()
+		Debug("[HTTPClient] Closed connection on 400 response")
+	}
+
 	c.redirectsCount = 0
 
 	return payload, err
 }
+
+func (c *HTTPClient) Get(path string) (response []byte, err error) {
+	payload := "GET " + path + " HTTP/1.1\r\n\r\n"
+
+	return c.Send([]byte(payload))
+}
+
+func (c *HTTPClient) Post(path string, body []byte) (response []byte, err error) {
+	payload := "POST " + path + " HTTP/1.1\r\n"
+	payload += "Content-Length: " + strconv.Itoa(len(body)) + "\r\n\r\n"
+	payload += string(body)
+
+	return c.Send([]byte(payload))
+}
+
+const (
+	// https://support.cloudflare.com/hc/en-us/articles/200171936-Error-520-Web-server-is-returning-an-unknown-error
+	HTTP_UNKNOWN_ERROR = "520"
+	// https://support.cloudflare.com/hc/en-us/articles/200171916-Error-521-Web-server-is-down
+	HTTP_CONNECTION_ERROR = "521"
+	// https://support.cloudflare.com/hc/en-us/articles/200171906-Error-522-Connection-timed-out
+	HTTP_CONNECTION_TIMEOUT = "522"
+	// https://support.cloudflare.com/hc/en-us/articles/200171946-Error-523-Origin-is-unreachable
+	HTTP_UNREACHABLE = "523"
+	// https://support.cloudflare.com/hc/en-us/articles/200171926-Error-524-A-timeout-occurred
+	HTTP_TIMEOUT = "524"
+)
+
+var errorPayloadTemplate = "HTTP/1.1 202 Accepted\r\nDate: Mon, 17 Aug 2015 14:10:11 GMT\r\nContent-Length: 0\r\nContent-Type: text/plain; charset=utf-8\r\n\r\n"
+
+func errorPayload(errorCode string) []byte {
+	payload := make([]byte, len(errorPayloadTemplate))
+	copy(payload, errorPayloadTemplate)
+
+	copy(payload[29:58], []byte(time.Now().Format(time.RFC1123)))
+	copy(payload[9:12], errorCode)
+
+	return payload
+}

http_client_test.go

@@ -1,25 +1,31 @@
 package main
 
 import (
+	"bytes"
+	"crypto/rand"
+	"github.com/buger/gor/proto"
 	"io/ioutil"
+	_ "log"
 	"net"
 	"net/http"
 	"net/http/httptest"
 	"net/http/httputil"
+	_ "reflect"
+	"strings"
 	"sync"
 	"testing"
-	_ "time"
+	"time"
 )
 
 func TestHTTPClientURLPort(t *testing.T) {
 	c1 := NewHTTPClient("http://example.com", &HTTPClientConfig{})
-	if c1.baseURL != "http://example.com:80" {
-		t.Error("Sould add 80 port for http:", c1.baseURL)
+	if c1.baseURL != "http://example.com" {
+		t.Error("Sould not add 80 port for http:", c1.baseURL)
 	}
 
 	c2 := NewHTTPClient("https://example.com", &HTTPClientConfig{})
-	if c2.baseURL != "https://example.com:443" {
-		t.Error("Sould add 443 port for https:", c2.baseURL)
+	if c2.baseURL != "https://example.com" {
+		t.Error("Sould not add 443 port for https:", c2.baseURL)
 	}
 
 	c3 := NewHTTPClient("https://example.com:1", &HTTPClientConfig{})
@@ -28,8 +34,8 @@ func TestHTTPClientURLPort(t *testing.T) {
 	}
 
 	c4 := NewHTTPClient("example.com", &HTTPClientConfig{})
-	if c4.baseURL != "http://example.com:80" {
-		t.Error("Sould add default protocol:", c4.baseURL)
+	if c4.baseURL != "http://example.com" {
+		t.Error("Sould not add default protocol:", c4.baseURL)
 	}
 }
 
@@ -69,6 +75,7 @@ func TestHTTPClientSend(t *testing.T) {
 
 		wg.Done()
 	}))
+	defer server.Close()
 
 	client := NewHTTPClient(server.URL, &HTTPClientConfig{Debug: true})
 
@@ -81,6 +88,102 @@ func TestHTTPClientSend(t *testing.T) {
 	wg.Wait()
 }
 
+func TestHTTPClientResonseByClose(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	payload := []byte("GET / HTTP/1.1\r\n\r\n")
+	ln, _ := net.Listen("tcp", ":0")
+	go func() {
+		for {
+			conn, _ := ln.Accept()
+			buf := make([]byte, 4096)
+			conn.Read(buf)
+
+			conn.Write([]byte("HTTP/1.1 200 OK\r\n\r\n"))
+			conn.Write([]byte("ab"))
+			conn.Close()
+
+			wg.Done()
+		}
+	}()
+
+	client := NewHTTPClient(ln.Addr().String(), &HTTPClientConfig{Debug: true})
+
+	wg.Add(1)
+	resp, _ := client.Send(payload)
+
+	if !bytes.Equal(resp, []byte("HTTP/1.1 200 OK\r\n\r\nab")) {
+		t.Error("Should return valid response", string(resp))
+	}
+
+	wg.Wait()
+}
+
+// https://github.com/buger/gor/issues/184
+func TestHTTPClientResponseBuffer(t *testing.T) {
+	testCases := []struct {
+		name         string
+		responseSize int
+		buffserSize  int
+		expectedSize int
+		timeout      time.Duration
+	}{
+		{"Chunked, buffer overflow", 10 * 1024, 1024, 1024, 50 * time.Millisecond},
+
+		{"Chunked, fits buffer", 10 * 1024, 64 * 1024, 10*1024 + 145 /* headers length + chunked meta */, 50 * time.Millisecond},
+
+		{"Content-Length, buffer overflow", 1024, 1000, 1000, 50 * time.Millisecond},
+
+		{"Content-Length, fits buffer", 1024, 64 * 1024, 1024 + 118, 50 * time.Millisecond},
+	}
+
+	for _, tc := range testCases {
+		wg := new(sync.WaitGroup)
+
+		payload := []byte("GET / HTTP/1.1\r\n\r\n")
+
+		server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+			size := tc.responseSize // 1kb
+			rb := make([]byte, size)
+			rand.Read(rb)
+
+			w.Write(rb[:size/2])
+			w.Write(rb[size/2:])
+
+			wg.Done()
+		}))
+
+		client := NewHTTPClient(server.URL, &HTTPClientConfig{Debug: true, ResponseBufferSize: tc.buffserSize, Timeout: 100 * time.Millisecond})
+
+		wg.Add(2)
+
+		start := time.Now()
+		client.Send(payload)
+		resp, err := client.Send(payload)
+		stop := time.Now()
+
+		if err != nil {
+			t.Error("Request error", err)
+		}
+
+		if stop.Sub(start) > tc.timeout {
+			t.Error("Request took too long", stop.Sub(start), tc.timeout)
+		}
+
+		if len(resp) != tc.expectedSize {
+			t.Error(tc.name, " - Wrong response size:", tc.expectedSize, len(resp))
+		} else {
+			if !bytes.Equal(resp[0:8], []byte("HTTP/1.1")) {
+				t.Error(tc.name, " - Response buffer contains data from previous request", string(resp), len(resp))
+			}
+		}
+
+		wg.Wait()
+		server.Close()
+	}
+}
+
 func TestHTTPClientHTTPSSend(t *testing.T) {
 	wg := new(sync.WaitGroup)
 
@@ -117,6 +220,7 @@ func TestHTTPClientHTTPSSend(t *testing.T) {
 
 		wg.Done()
 	}))
+	defer server.Close()
 
 	client := NewHTTPClient(server.URL, &HTTPClientConfig{})
 
@@ -132,15 +236,19 @@ func TestHTTPClientHTTPSSend(t *testing.T) {
 func TestHTTPClientServerInstantDisconnect(t *testing.T) {
 	wg := new(sync.WaitGroup)
 
-	GET_payload := []byte("GET / HTTP/1.1\r\n\r\n")
+	GETPayload := []byte("GET / HTTP/1.1\r\n\r\n")
 
-	ln, _ := net.Listen("tcp", ":0")
+	ln, _ := net.Listen("tcp", "127.0.0.1:0")
+	defer ln.Close()
 
 	go func() {
 		for {
-			conn, _ := ln.Accept()
-			conn.Close()
+			conn, err := ln.Accept()
 
+			if err != nil {
+				break
+			}
+			conn.Close()
 			wg.Done()
 		}
 	}()
@@ -148,8 +256,8 @@ func TestHTTPClientServerInstantDisconnect(t *testing.T) {
 	client := NewHTTPClient(ln.Addr().String(), &HTTPClientConfig{})
 
 	wg.Add(2)
-	client.Send(GET_payload)
-	client.Send(GET_payload)
+	client.Send(GETPayload)
+	client.Send(GETPayload)
 
 	wg.Wait()
 }
@@ -157,15 +265,16 @@ func TestHTTPClientServerInstantDisconnect(t *testing.T) {
 func TestHTTPClientServerNoKeepAlive(t *testing.T) {
 	wg := new(sync.WaitGroup)
 
-	GET_payload := []byte("GET / HTTP/1.1\r\n\r\n")
+	GETPayload := []byte("GET / HTTP/1.1\r\n\r\n")
 
-	ln, _ := net.Listen("tcp", ":0")
+	ln, _ := net.Listen("tcp", "127.0.0.1:0")
+	defer ln.Close()
 
 	go func() {
 		for {
 			conn, err := ln.Accept()
 			if err != nil {
-				// handle error
+				break
 			}
 
 			buf := make([]byte, 4096)
@@ -186,8 +295,8 @@ func TestHTTPClientServerNoKeepAlive(t *testing.T) {
 	client := NewHTTPClient(ln.Addr().String(), &HTTPClientConfig{})
 
 	wg.Add(2)
-	client.Send(GET_payload)
-	client.Send(GET_payload)
+	client.Send(GETPayload)
+	client.Send(GETPayload)
 
 	wg.Wait()
 }
@@ -195,7 +304,7 @@ func TestHTTPClientServerNoKeepAlive(t *testing.T) {
 func TestHTTPClientRedirect(t *testing.T) {
 	wg := new(sync.WaitGroup)
 
-	GET_payload := []byte("GET / HTTP/1.1\r\n\r\n")
+	GETPayload := []byte("GET / HTTP/1.1\r\n\r\n")
 
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 
@@ -205,12 +314,13 @@ func TestHTTPClientRedirect(t *testing.T) {
 
 		wg.Done()
 	}))
+	defer server.Close()
 
 	client := NewHTTPClient(server.URL, &HTTPClientConfig{FollowRedirects: 1, Debug: false})
 
 	// Should do 2 queries
 	wg.Add(2)
-	client.Send(GET_payload)
+	client.Send(GETPayload)
 
 	wg.Wait()
 }
@@ -218,7 +328,7 @@ func TestHTTPClientRedirect(t *testing.T) {
 func TestHTTPClientRedirectLimit(t *testing.T) {
 	wg := new(sync.WaitGroup)
 
-	GET_payload := []byte("GET / HTTP/1.1\r\n\r\n")
+	GETPayload := []byte("GET / HTTP/1.1\r\n\r\n")
 
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 
@@ -236,12 +346,52 @@ func TestHTTPClientRedirectLimit(t *testing.T) {
 
 		wg.Done()
 	}))
+	defer server.Close()
 
 	client := NewHTTPClient(server.URL, &HTTPClientConfig{FollowRedirects: 2, Debug: false})
 
 	// Have 3 redirects + 1 GET, but should do only 2 redirects + GET
 	wg.Add(3)
-	client.Send(GET_payload)
+	client.Send(GETPayload)
+
+	wg.Wait()
+}
+
+func TestHTTPClientBasicAuth(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	wg.Add(2)
+
+	GETPayload := []byte("GET / HTTP/1.1\r\n\r\n")
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		user, pass, _ := r.BasicAuth()
+
+		if user != "user" || pass != "pass" {
+			http.Error(w, "Unauthorized.", 401)
+			wg.Done()
+			return
+		}
+
+		wg.Done()
+	}))
+	defer server.Close()
+
+	client := NewHTTPClient(server.URL, &HTTPClientConfig{Debug: false})
+	resp, _ := client.Send(GETPayload)
+	client.Disconnect()
+
+	if !bytes.Equal(proto.Status(resp), []byte("401")) {
+		t.Error("Should return unauthorized error", string(resp))
+	}
+
+	authUrl := strings.Replace(server.URL, "http://", "http://user:pass@", -1)
+	client = NewHTTPClient(authUrl, &HTTPClientConfig{Debug: false})
+	resp, _ = client.Send(GETPayload)
+	client.Disconnect()
+
+	if !bytes.Equal(proto.Status(resp), []byte("200")) {
+		t.Error("Should return proper response", string(resp))
+	}
 
 	wg.Wait()
 }
@@ -249,7 +399,7 @@ func TestHTTPClientRedirectLimit(t *testing.T) {
 func TestHTTPClientHandleHTTP10(t *testing.T) {
 	wg := new(sync.WaitGroup)
 
-	GET_payload := []byte("GET http://foobar.com/path HTTP/1.0\r\n\r\n")
+	GETPayload := []byte("GET http://foobar.com/path HTTP/1.0\r\n\r\n")
 
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 
@@ -259,11 +409,76 @@ func TestHTTPClientHandleHTTP10(t *testing.T) {
 
 		wg.Done()
 	}))
+	defer server.Close()
 
 	client := NewHTTPClient(server.URL, &HTTPClientConfig{Debug: true})
 
 	wg.Add(1)
-	client.Send(GET_payload)
+	client.Send(GETPayload)
 
 	wg.Wait()
 }
+
+func TestHTTPClientErrors(t *testing.T) {
+	req := []byte("GET http://foobar.com/path HTTP/1.0\r\n\r\n")
+
+	// Port not exists
+	client := NewHTTPClient("http://127.0.0.1:1", &HTTPClientConfig{Debug: true})
+	if resp, err := client.Send(req); err != nil {
+		if s := proto.Status(resp); !bytes.Equal(s, []byte("521")) {
+			t.Error("Should return status 521 for connection refused, instead:", string(s))
+		}
+	} else {
+		t.Error("Should throw error")
+	}
+
+	client = NewHTTPClient("http://not.existing", &HTTPClientConfig{Debug: true})
+	if resp, err := client.Send(req); err != nil {
+		if s := proto.Status(resp); !bytes.Equal(s, []byte("521")) {
+			t.Error("Should return status 521 for no such host, instead:", string(s))
+		}
+	} else {
+		t.Error("Should throw error")
+	}
+
+	// Non routable IP address to simulate connection timeout
+	client = NewHTTPClient("http://10.255.255.1", &HTTPClientConfig{Debug: true, ConnectionTimeout: 100 * time.Millisecond})
+
+	if resp, err := client.Send(req); err != nil {
+		if s := proto.Status(resp); !bytes.Equal(s, []byte("521")) {
+			t.Error("Should return status 521 for io/timeout:", string(s))
+		}
+	} else {
+		t.Error("Should throw error")
+	}
+
+	// Connecting but io timeout on read
+	ln, _ := net.Listen("tcp", "127.0.0.1:0")
+	client = NewHTTPClient("http://"+ln.Addr().String(), &HTTPClientConfig{Debug: true, Timeout: 10 * time.Millisecond})
+	defer ln.Close()
+
+	if resp, err := client.Send(req); err != nil {
+		if s := proto.Status(resp); !bytes.Equal(s, []byte("524")) {
+			t.Error("Should return status 524 for io read, instead:", string(s))
+		}
+	} else {
+		t.Error("Should throw error")
+	}
+
+	// Response read error read tcp [::1]:51128: connection reset by peer &{{0xc20802a000}}
+	ln1, _ := net.Listen("tcp", "127.0.0.1:0")
+	go func() {
+		ln1.Accept()
+	}()
+	defer ln1.Close()
+
+	client = NewHTTPClient("http://"+ln1.Addr().String(), &HTTPClientConfig{Debug: true, Timeout: 10 * time.Millisecond})
+
+	if resp, err := client.Send(req); err != nil {
+		if s := proto.Status(resp); !bytes.Equal(s, []byte("524")) {
+			t.Error("Should return status 524 for connection reset by peer, instead:", string(s))
+		}
+	} else {
+		t.Error("Should throw error")
+	}
+}

http_modifier.go

@@ -2,8 +2,9 @@ package main
 
 import (
 	"bytes"
-	"github.com/buger/gor/proto"
 	"hash/fnv"
+
+	"github.com/buger/gor/proto"
 )
 
 type HTTPModifier struct {
@@ -16,6 +17,7 @@ func NewHTTPModifier(config *HTTPModifierConfig) *HTTPModifier {
 		len(config.urlNegativeRegexp) == 0 &&
 		len(config.urlRewrite) == 0 &&
 		len(config.headerFilters) == 0 &&
+		len(config.headerNegativeFilters) == 0 &&
 		len(config.headerHashFilters) == 0 &&
 		len(config.paramHashFilters) == 0 &&
 		len(config.params) == 0 &&
@@ -28,6 +30,10 @@ func NewHTTPModifier(config *HTTPModifierConfig) *HTTPModifier {
 }
 
 func (m *HTTPModifier) Rewrite(payload []byte) (response []byte) {
+	if !proto.IsHTTPPayload(payload) {
+		return payload
+	}
+
 	if len(m.config.methods) > 0 {
 		method := proto.Method(payload)
 
@@ -86,9 +92,19 @@ func (m *HTTPModifier) Rewrite(payload []byte) (response []byte) {
 
 	if len(m.config.headerFilters) > 0 {
 		for _, f := range m.config.headerFilters {
-			value, s, _, _ := proto.Header(payload, f.name)
+			value := proto.Header(payload, f.name)
 
-			if s != -1 && !f.regexp.Match(value) {
+			if len(value) > 0 && !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
 			}
 		}
@@ -96,9 +112,9 @@ func (m *HTTPModifier) Rewrite(payload []byte) (response []byte) {
 
 	if len(m.config.headerHashFilters) > 0 {
 		for _, f := range m.config.headerHashFilters {
-			value, s, _, _ := proto.Header(payload, f.name)
+			value := proto.Header(payload, f.name)
 
-			if s != -1 {
+			if len(value) > 0 {
 				hasher := fnv.New32a()
 				hasher.Write(value)
 

http_modifier_settings.go

@@ -8,13 +8,15 @@ import (
 	"strings"
 )
 
+// HTTPModifierConfig holds configuration options for built-in traffic modifier
 type HTTPModifierConfig struct {
-	urlNegativeRegexp HTTPUrlRegexp
-	urlRegexp         HTTPUrlRegexp
-	urlRewrite        UrlRewriteMap
-	headerFilters     HTTPHeaderFilters
-	headerHashFilters HTTPHashFilters
-	paramHashFilters  HTTPHashFilters
+	urlNegativeRegexp     HTTPUrlRegexp
+	urlRegexp             HTTPUrlRegexp
+	urlRewrite            UrlRewriteMap
+	headerFilters         HTTPHeaderFilters
+	headerNegativeFilters HTTPHeaderFilters
+	headerHashFilters     HTTPHashFilters
+	paramHashFilters      HTTPHashFilters
 
 	params  HTTPParams
 	headers HTTPHeaders
@@ -22,13 +24,14 @@ type HTTPModifierConfig struct {
 }
 
 //
-// Handling of --http-allow-header options
+// 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 {
@@ -67,7 +70,7 @@ func (h *HTTPHashFilters) String() string {
 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%).")
+		return errors.New("need both header and value, colon-delimited (ex. user_id:50%)")
 	}
 
 	f := hashFilter{name: []byte(valArr[0])}
@@ -180,7 +183,7 @@ func (r *UrlRewriteMap) String() string {
 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).")
+		return errors.New("need both src and target, colon-delimited (ex. /a:/b)")
 	}
 	regexp, err := regexp.Compile(valArr[0])
 	if err != nil {

http_modifier_test.go

@@ -39,8 +39,35 @@ func TestHTTPModifierHeaderFilters(t *testing.T) {
 	}
 }
 
+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")
+	}
+}
+
 func TestHTTPModifierURLRewrite(t *testing.T) {
-	var url, new_url []byte
+	var url, newURL []byte
 
 	rewrites := UrlRewriteMap{}
 
@@ -58,13 +85,13 @@ func TestHTTPModifierURLRewrite(t *testing.T) {
 	})
 
 	url = []byte("/v1/user/joe/ping")
-	if new_url = proto.Path(modifier.Rewrite(payload(url))); bytes.Equal(new_url, url) {
-		t.Error("Request url should have been rewritten, wasn't", string(new_url))
+	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 new_url = proto.Path(modifier.Rewrite(payload(url))); !bytes.Equal(new_url, url) {
-		t.Error("Request url should have been rewritten, wasn't", string(new_url))
+	if newURL = proto.Path(modifier.Rewrite(payload(url))); !bytes.Equal(newURL, url) {
+		t.Error("Request url should have been rewritten, wasn't", string(newURL))
 	}
 }
 
@@ -128,9 +155,9 @@ func TestHTTPModifierHeaders(t *testing.T) {
 	})
 
 	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
-	new_payload := []byte("POST /post HTTP/1.1\r\nHeader1: 1\r\nContent-Length: 7\r\nHost: localhost\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, new_payload) {
+	if payload = modifier.Rewrite(payload); !bytes.Equal(payload, newPayload) {
 		t.Error("Should update request headers", string(payload))
 	}
 }
@@ -196,9 +223,9 @@ func TestHTTPModifierSetHeader(t *testing.T) {
 	})
 
 	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
-	payload_after := []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")
+	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(payload_after, payload) {
+	if payload = modifier.Rewrite(payload); !bytes.Equal(payloadAfter, payload) {
 		t.Error("Should add new header", string(payload))
 	}
 }
@@ -212,9 +239,9 @@ func TestHTTPModifierSetParam(t *testing.T) {
 	})
 
 	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")
-	payload_after := []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")
+	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(payload_after, payload) {
+	if payload = modifier.Rewrite(payload); !bytes.Equal(payloadAfter, payload) {
 		t.Error("Should override param", string(payload))
 	}
 }

input_dummy.go

@@ -4,10 +4,12 @@ import (
 	"time"
 )
 
+// DummyInput used for debugging. It generate 1 "GET /"" request per second.
 type DummyInput struct {
 	data chan []byte
 }
 
+// NewDummyInput constructor for DummyInput
 func NewDummyInput(options string) (di *DummyInput) {
 	di = new(DummyInput)
 	di.data = make(chan []byte)
@@ -19,6 +21,7 @@ func NewDummyInput(options string) (di *DummyInput) {
 
 func (i *DummyInput) Read(data []byte) (int, error) {
 	buf := <-i.data
+
 	copy(data, buf)
 
 	return len(buf), nil
@@ -30,7 +33,12 @@ 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")...)
 		}
 	}
 }

input_file.go

@@ -1,39 +1,159 @@
 package main
 
 import (
-	"encoding/gob"
+	"bufio"
+	"bytes"
+	"compress/gzip"
+	"errors"
+	"io"
 	"log"
 	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"sync"
 	"time"
 )
 
-type FileInput struct {
-	data        chan []byte
-	path        string
-	decoder     *gob.Decoder
-	speedFactor float64
+type fileInputReader struct {
+	reader    *bufio.Reader
+	data      []byte
+	file      *os.File
+	timestamp int64
 }
 
-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 {
+				log.Println(err)
+				return err
+			}
+
+			if err == io.EOF {
+				f.file.Close()
+				f.file = nil
+				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)
+	}
+
+	return nil
+}
+
+func (f *fileInputReader) ReadPayload() []byte {
+	defer f.parseNext()
+
+	return f.data
+}
+func (f *fileInputReader) Close() error {
+	if f.file != nil {
+		f.file.Close()
+	}
+
+	return nil
+}
+
+func NewFileInputReader(path string) *fileInputReader {
+	file, err := os.Open(path)
+
+	if err != nil {
+		log.Println(err)
+		return nil
+	}
+
+	r := &fileInputReader{file: file}
+	if strings.HasSuffix(path, ".gz") {
+		gzReader, err := gzip.NewReader(file)
+		if err != nil {
+			log.Println(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, 1)
 	i.path = path
 	i.speedFactor = 1
-	i.Init(path)
+	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)
+type NextFileNotFound struct{}
 
-	if err != nil {
-		log.Fatal(i, "Cannot open file %q. Error: %s", path, err)
+func (_ *NextFileNotFound) Error() string {
+	return "There is no new files"
+}
+
+func (i *FileInput) init() (err error) {
+	defer i.mu.Unlock()
+	i.mu.Lock()
+
+	var matches []string
+
+	if matches, err = filepath.Glob(i.path); err != nil {
+		log.Println("Wrong file pattern", i.path, err)
+		return
 	}
 
-	i.decoder = gob.NewDecoder(file)
+	if len(matches) == 0 {
+		log.Println("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) {
@@ -47,30 +167,72 @@ 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 || r.file == nil {
+			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 {
-			timeDiff := raw.Timestamp - lastTime
+		reader := i.nextReader()
+
+		if reader == nil {
+			if i.loop {
+				i.init()
+				lastTime = -1
+				continue
+			} else {
+				break
+			}
+		}
+
+		if lastTime != -1 {
+			diff := reader.timestamp - lastTime
+			lastTime = reader.timestamp
 
-			// We can speedup or slowdown execution based on speedFactor
 			if i.speedFactor != 1 {
-				timeDiff = int64(float64(raw.Timestamp-lastTime) / i.speedFactor)
+				diff = int64(float64(diff) / i.speedFactor)
 			}
 
-			time.Sleep(time.Duration(timeDiff))
+			time.Sleep(time.Duration(diff))
+		} else {
+			lastTime = reader.timestamp
 		}
 
-		lastTime = raw.Timestamp
-
-		i.data <- raw.Request
+		i.data <- reader.ReadPayload()
 	}
+
+	log.Printf("FileInput: end of file '%s'\n", i.path)
+}
+
+func (i *FileInput) Close() error {
+	defer i.mu.Unlock()
+	i.mu.Lock()
+
+	i.exit <- true
+
+	for _, r := range i.readers {
+		r.Close()
+	}
+
+	return nil
 }

input_file_test.go

@@ -0,0 +1,382 @@
+package main
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"math/rand"
+	"os"
+	"sync"
+	"syscall"
+	"testing"
+	"time"
+)
+
+var _ = log.Println
+
+func TestInputFileWithGET(t *testing.T) {
+
+	input := NewTestInput()
+	rg := NewRequestGenerator([]io.Reader{input}, func() { input.EmitGET() }, 1)
+	readPayloads := [][]byte{}
+
+	// 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(data []byte) {
+		readPayloads = append(readPayloads, Duplicate(data))
+	})
+
+	// 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([]io.Reader{input}, func() { input.EmitSizedPOST(64 * 1024) }, 1)
+	readPayloads := [][]byte{}
+
+	// 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(data []byte) {
+		readPayloads = append(readPayloads, Duplicate(data))
+	})
+
+	// 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([]io.Reader{input}, func() {
+		input.EmitGET()
+		input.EmitPOST()
+	}, 2)
+	readPayloads := [][]byte{}
+
+	// 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(data []byte) {
+		readPayloads = append(readPayloads, Duplicate(data))
+	})
+
+	// 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)
+	buf := make([]byte, 1000)
+
+	for i := '1'; i <= '4'; i++ {
+		n, _ := input.Read(buf)
+		if buf[4] != byte(i) {
+			t.Error("Should emit requests in right order", string(buf[:n]))
+		}
+	}
+
+	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)
+	buf := make([]byte, 1000)
+
+	start := time.Now().UnixNano()
+	for i := 0; i < 3; i++ {
+		input.Read(buf)
+	}
+	end := time.Now().UnixNano()
+
+	var expectedLatency int64 = 250000000 - 100000000
+	realLatency := end - start
+	if realLatency < expectedLatency {
+		t.Errorf("Should emit requests respecting latency. Expected: %v, real: %v", expectedLatency, realLatency)
+	}
+
+	if realLatency > expectedLatency+10000000 {
+		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)
+	buf := make([]byte, 1000)
+
+	for i := '1'; i <= '4'; i++ {
+		n, _ := input.Read(buf)
+		if buf[0] != '1' && buf[4] != byte(i) {
+			t.Error("Shound emit requests in right order", string(buf[:n]))
+		}
+
+		n, _ = input.Read(buf)
+		if buf[0] != '2' && buf[4] != byte(i) {
+			t.Error("Shound emit responses in right order", string(buf[:n]))
+		}
+	}
+
+	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)
+	buf := make([]byte, 1000)
+
+	// Even if we have just 2 requests in file, it should indifinitly loop
+	for i := 0; i < 1000; i++ {
+		input.Read(buf)
+	}
+
+	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.Write([]byte("1 1 1\r\ntest"))
+	}
+	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.Write([]byte("1 1 1\r\ntest"))
+	}
+	name2 := output2.file.Name()
+	output2.Close()
+
+	input := NewFileInput(fmt.Sprintf("/tmp/%d*", rnd), false)
+	buf := make([]byte, 1000)
+	for i := 0; i < 2000; i++ {
+		input.Read(buf)
+	}
+
+	os.Remove(name1)
+	os.Remove(name2)
+}
+
+type CaptureFile struct {
+	data [][]byte
+	file *os.File
+}
+
+func NewExpectedCaptureFile(data [][]byte, file *os.File) *CaptureFile {
+	ecf := new(CaptureFile)
+	ecf.file = file
+	ecf.data = data
+	return ecf
+}
+
+func (expectedCaptureFile *CaptureFile) TearDown() {
+	if expectedCaptureFile.file != nil {
+		syscall.Unlink(expectedCaptureFile.file.Name())
+	}
+}
+
+type RequestGenerator struct {
+	inputs []io.Reader
+	emit   func()
+	wg     *sync.WaitGroup
+}
+
+func NewRequestGenerator(inputs []io.Reader, 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 [][]byte) bool {
+
+	if len(expectedCaptureFile.data) != len(other) {
+		return false
+	}
+
+	for i, payload := range other {
+		if !bytes.Equal(expectedCaptureFile.data[i], payload) {
+			return false
+		}
+	}
+
+	return true
+
+}
+
+func CreateCaptureFile(requestGenerator *RequestGenerator) *CaptureFile {
+
+	f, err := ioutil.TempFile("", "testmainconf")
+	if err != nil {
+		panic(err)
+	}
+
+	quit := make(chan int)
+
+	readPayloads := [][]byte{}
+	output := NewTestOutput(func(data []byte) {
+		readPayloads = append(readPayloads, Duplicate(data))
+
+		requestGenerator.wg.Done()
+	})
+
+	outputFile := NewFileOutput(f.Name(), &FileOutputConfig{flushInterval: time.Minute, append: true})
+
+	Plugins.Inputs = requestGenerator.inputs
+	Plugins.Outputs = []io.Writer{output, outputFile}
+
+	go Start(quit)
+
+	requestGenerator.emit()
+	requestGenerator.wg.Wait()
+
+	time.Sleep(100 * time.Millisecond)
+	outputFile.Close()
+
+	close(quit)
+
+	return NewExpectedCaptureFile(readPayloads, f)
+
+}
+
+func ReadFromCaptureFile(captureFile *os.File, count int, callback writeCallback) (err error) {
+
+	quit := make(chan int)
+	wg := new(sync.WaitGroup)
+
+	input := NewFileInput(captureFile.Name(), false)
+	output := NewTestOutput(func(data []byte) {
+		callback(data)
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	wg.Add(count)
+	go Start(quit)
+
+	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")
+	}
+	close(quit)
+
+	return
+
+}
+
+func Duplicate(data []byte) (duplicate []byte) {
+	duplicate = make([]byte, len(data))
+	copy(duplicate, data)
+
+	return
+}

input_http.go

@@ -5,17 +5,20 @@ import (
 	"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
 }
 
+// NewHTTPInput constructor for HTTPInput. Accepts address with port which he will listen on.
 func NewHTTPInput(address string) (i *HTTPInput) {
 	i = new(HTTPInput)
-	i.data = make(chan []byte)
+	i.data = make(chan []byte, 10000)
 	i.address = address
 
 	i.listen(address)
@@ -25,17 +28,27 @@ func NewHTTPInput(address string) (i *HTTPInput) {
 
 func (i *HTTPInput) Read(data []byte) (int, error) {
 	buf := <-i.data
-	copy(data, buf)
 
-	return len(buf), nil
+	header := payloadHeader(RequestPayload, uuid(), time.Now().UnixNano(), -1)
+
+	copy(data[0:len(header)], header)
+	copy(data[len(header):], buf)
+
+	return len(buf) + len(header), nil
 }
 
 func (i *HTTPInput) handler(w http.ResponseWriter, r *http.Request) {
-	buf, _ := httputil.DumpRequest(r, true)
-
-	i.data <- buf
+	r.URL.Scheme = "http"
+	r.URL.Host = i.listener.Addr().String()
 
+	buf, _ := httputil.DumpRequestOut(r, true)
 	http.Error(w, http.StatusText(200), 200)
+
+	select {
+	case i.data <- buf:
+	default:
+		Debug("[INPUT-HTTP] Dropping requests because output can't process them fast enough")
+	}
 }
 
 func (i *HTTPInput) listen(address string) {

input_http_test.go

@@ -1,8 +1,11 @@
 package main
 
 import (
+	"github.com/buger/gor/proto"
 	"io"
+	"log"
 	"net/http"
+	"os/exec"
 	"strings"
 	"sync"
 	"testing"
@@ -12,7 +15,7 @@ func TestHTTPInput(t *testing.T) {
 	wg := new(sync.WaitGroup)
 	quit := make(chan int)
 
-	input := NewHTTPInput(":0")
+	input := NewHTTPInput("127.0.0.1:0")
 	output := NewTestOutput(func(data []byte) {
 		wg.Done()
 	})
@@ -33,3 +36,37 @@ func TestHTTPInput(t *testing.T) {
 
 	close(quit)
 }
+
+func TestInputHTTPLargePayload(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	dd := exec.Command("dd", "if=/dev/urandom", "of=/tmp/large", "bs=1", "count=4000000")
+	err := dd.Run()
+	if err != nil {
+		log.Fatal("dd error:", err)
+	}
+
+	input := NewHTTPInput("127.0.0.1:0")
+	output := NewTestOutput(func(data []byte) {
+		if len(proto.Body(payloadBody(data))) != 4000000 {
+			t.Error("Should receive full file")
+		}
+		wg.Done()
+	})
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	wg.Add(1)
+	address := strings.Replace(input.listener.Addr().String(), "[::]", "127.0.0.1", -1)
+	curl := exec.Command("curl", "http://"+address, "--data-binary", "@/tmp/large")
+	err = curl.Run()
+	if err != nil {
+		log.Fatal("curl error:", err)
+	}
+
+	wg.Wait()
+	close(quit)
+}

input_raw.go

@@ -1,53 +1,111 @@
 package main
 
 import (
+	"github.com/buger/gor/proto"
 	raw "github.com/buger/gor/raw_socket_listener"
 	"log"
 	"net"
-	"strings"
+	"time"
 )
 
+// RAWInput used for intercepting traffic for given address
 type RAWInput struct {
-	data    chan []byte
-	address string
+	data          chan *raw.TCPMessage
+	address       string
+	expire        time.Duration
+	quit          chan bool
+	engine        int
+	realIPHeader  []byte
+	trackResponse bool
+	listener      *raw.Listener
 }
 
-func NewRAWInput(address string) (i *RAWInput) {
-	i = new(RAWInput)
-	i.data = make(chan []byte)
-	i.address = address
+// Available engines for intercepting traffic
+const (
+	EngineRawSocket = 1 << iota
+	EnginePcap
+	EnginePcapFile
+)
 
-	go i.listen(address)
+// NewRAWInput constructor for RAWInput. Accepts address with port as argument.
+func NewRAWInput(address string, engine int, trackResponse bool, expire time.Duration, realIPHeader string) (i *RAWInput) {
+	i = new(RAWInput)
+	i.data = make(chan *raw.TCPMessage)
+	i.address = address
+	i.expire = expire
+	i.engine = engine
+	i.realIPHeader = []byte(realIPHeader)
+	i.quit = make(chan bool)
+	i.trackResponse = trackResponse
+
+	i.listen(address)
+	i.listener.IsReady()
 
 	return
 }
 
 func (i *RAWInput) Read(data []byte) (int, error) {
-	buf := <-i.data
-	copy(data, buf)
+	msg := <-i.data
+	buf := msg.Bytes()
 
-	return len(buf), nil
+	var header []byte
+
+	if msg.IsIncoming {
+		header = payloadHeader(RequestPayload, msg.UUID(), msg.Start.UnixNano(), -1)
+		if len(i.realIPHeader) > 0 {
+			buf = proto.SetHeader(buf, i.realIPHeader, []byte(msg.IP().String()))
+		}
+	} else {
+		header = payloadHeader(ResponsePayload, msg.UUID(), msg.AssocMessage.Start.UnixNano(), msg.End.UnixNano()-msg.AssocMessage.Start.UnixNano())
+	}
+
+	copy(data[0:len(header)], header)
+	copy(data[len(header):], buf)
+
+	return len(buf) + len(header), nil
 }
 
 func (i *RAWInput) listen(address string) {
-	address = strings.Replace(address, "[::]", "127.0.0.1", -1)
+	Debug("Listening for traffic on: " + address)
 
 	host, port, err := net.SplitHostPort(address)
 
+	if i.engine == EnginePcapFile {
+		host = address
+		port = "1"
+		err = nil
+	}
+
 	if err != nil {
 		log.Fatal("input-raw: error while parsing address", err)
 	}
 
-	listener := raw.NewListener(host, port)
+	i.listener = raw.NewListener(host, port, i.engine, i.trackResponse, i.expire)
 
-	for {
-		// Receiving TCPMessage object
-		m := listener.Receive()
+	ch := i.listener.Receiver()
 
-		i.data <- m.Bytes()
-	}
+	go func() {
+		for {
+			select {
+			case <-i.quit:
+				return
+			default:
+			}
+
+			// Receiving TCPMessage object
+			m := <-ch
+
+			i.data <- m
+		}
+	}()
 }
 
 func (i *RAWInput) String() string {
-	return "RAW Socket input: " + i.address
+	return "Intercepting traffic from: " + i.address
+}
+
+func (i *RAWInput) Close() error {
+	i.listener.Close()
+	close(i.quit)
+	return nil
 }

input_raw_test.go

@@ -2,40 +2,80 @@ package main
 
 import (
 	"bytes"
+	"github.com/buger/gor/proto"
 	"io"
 	"io/ioutil"
 	"log"
+	"math/rand"
+	"net"
 	"net/http"
+	"net/http/httptest"
 	"net/http/httputil"
+	"os"
 	"os/exec"
+	"strconv"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"testing"
+	"time"
 )
 
-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("tcp", ":0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	origin := &http.Server{
+		Handler:      http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}),
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+	go origin.Serve(listener)
+	defer listener.Close()
+
+	originAddr := listener.Addr().String()
+
+	var respCounter, reqCounter int64
+
+	input := NewRAWInput(originAddr, EnginePcap, true, testRawExpire, "X-Real-IP")
+	defer input.Close()
 
-	input := NewRAWInput(listener.Addr().String())
 	output := NewTestOutput(func(data []byte) {
+		if data[0] == '1' {
+			body := payloadBody(data)
+			if len(proto.Header(body, []byte("X-Real-IP"))) == 0 {
+				t.Error("Should have X-Real-IP header", string(body))
+			}
+			atomic.AddInt64(&reqCounter, 1)
+		} else {
+			atomic.AddInt64(&respCounter, 1)
+		}
+
+		if Settings.debug {
+			log.Println(reqCounter, respCounter)
+		}
+
 		wg.Done()
 	})
 
 	Plugins.Inputs = []io.Reader{input}
 	Plugins.Outputs = []io.Writer{output}
 
-	address := strings.Replace(listener.Addr().String(), "[::]", "127.0.0.1", -1)
+	client := NewHTTPClient("http://"+listener.Addr().String(), &HTTPClientConfig{})
 
 	go Start(quit)
 
 	for i := 0; i < 100; i++ {
-		wg.Add(1)
-		res, _ := http.Get("http://" + address)
-		res.Body.Close()
+		// request + response
+		wg.Add(2)
+		client.Get("/")
+		time.Sleep(2 * time.Millisecond)
 	}
 
 	wg.Wait()
@@ -43,54 +83,164 @@ func TestRAWInput(t *testing.T) {
 	close(quit)
 }
 
+func TestRAWInputNoKeepAlive(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	listener, err := net.Listen("tcp", ":0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	origin := &http.Server{
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			w.Write([]byte("a"))
+			w.Write([]byte("b"))
+		}),
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+	origin.SetKeepAlivesEnabled(false)
+	go origin.Serve(listener)
+	defer listener.Close()
+
+	originAddr := listener.Addr().String()
+
+	input := NewRAWInput(originAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	output := NewTestOutput(func(data []byte) {
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	client := NewHTTPClient("http://"+listener.Addr().String(), &HTTPClientConfig{})
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		// request + response
+		wg.Add(2)
+		client.Get("/")
+		time.Sleep(2 * time.Millisecond)
+	}
+
+	wg.Wait()
+
+	close(quit)
+}
+
+func TestRAWInputIPv6(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	listener, err := net.Listen("tcp", "[::1]:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	origin := &http.Server{
+		Handler:      http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}),
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 10 * time.Second,
+	}
+	go origin.Serve(listener)
+	defer listener.Close()
+
+	originAddr := listener.Addr().String()
+
+	var respCounter, reqCounter int64
+
+	input := NewRAWInput(originAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	output := NewTestOutput(func(data []byte) {
+		if data[0] == '1' {
+			atomic.AddInt64(&reqCounter, 1)
+		} else {
+			atomic.AddInt64(&respCounter, 1)
+		}
+
+		if Settings.debug {
+			log.Println(reqCounter, respCounter)
+		}
+
+		wg.Done()
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	client := NewHTTPClient("http://"+listener.Addr().String(), &HTTPClientConfig{})
+
+	go Start(quit)
+
+	for i := 0; i < 100; i++ {
+		// request + response
+		wg.Add(2)
+		client.Get("/")
+		time.Sleep(2 * time.Millisecond)
+	}
+
+	wg.Wait()
+	close(quit)
+}
+
 func TestInputRAW100Expect(t *testing.T) {
 	wg := new(sync.WaitGroup)
 	quit := make(chan int)
 
-	file_content, _ := ioutil.ReadFile("README.md")
+	fileContent, _ := ioutil.ReadFile("COMM-LICENSE")
 
 	// Origing and Replay server initialization
-	origin := startHTTP(func(req *http.Request) {
-		defer req.Body.Close()
-		ioutil.ReadAll(req.Body)
-
+	origin := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer r.Body.Close()
+		ioutil.ReadAll(r.Body)
 		wg.Done()
-	})
+	}))
+	defer origin.Close()
 
-	origin_address := strings.Replace(origin.Addr().String(), "[::]", "127.0.0.1", -1)
+	originAddr := strings.Replace(origin.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
 
-	input := NewRAWInput(origin_address)
+	input := NewRAWInput(originAddr, EnginePcap, true, time.Second, "")
+	defer input.Close()
 
 	// We will use it to get content of raw HTTP request
-	test_output := NewTestOutput(func(data []byte) {
-		if strings.Contains(string(data), "Expect: 100-continue") {
-			t.Error("Should not contain 100-continue header")
+	testOutput := NewTestOutput(func(data []byte) {
+		switch data[0] {
+		case RequestPayload:
+			if strings.Contains(string(data), "Expect: 100-continue") {
+				t.Error("Should not contain 100-continue header")
+			}
+			wg.Done()
+		case ResponsePayload:
+			wg.Done()
 		}
-		wg.Done()
 	})
 
-	listener := startHTTP(func(req *http.Request) {
-		defer req.Body.Close()
-		body, _ := ioutil.ReadAll(req.Body)
+	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, file_content) {
-			buf, _ := httputil.DumpRequest(req, true)
+		if !bytes.Equal(body, fileContent) {
+			buf, _ := httputil.DumpRequest(r, true)
 			t.Error("Wrong POST body:", string(buf))
 		}
 
 		wg.Done()
-	})
-	replay_address := listener.Addr().String()
+	}))
+	defer replay.Close()
 
-	http_output := NewHTTPOutput(replay_address, &HTTPOutputConfig{})
+	httpOutput := NewHTTPOutput(replay.URL, &HTTPOutputConfig{})
 
 	Plugins.Inputs = []io.Reader{input}
-	Plugins.Outputs = []io.Writer{test_output, http_output}
+	Plugins.Outputs = []io.Writer{testOutput, httpOutput}
 
 	go Start(quit)
 
-	wg.Add(3)
-	curl := exec.Command("curl", "http://"+origin_address, "--data-binary", "@README.md")
+	// Origin + Response/Request Test Output + Request Http Output
+	wg.Add(4)
+	curl := exec.Command("curl", "http://"+originAddr, "--data-binary", "@COMM-LICENSE")
 	err := curl.Run()
 	if err != nil {
 		log.Fatal(err)
@@ -104,43 +254,43 @@ func TestInputRAWChunkedEncoding(t *testing.T) {
 	wg := new(sync.WaitGroup)
 	quit := make(chan int)
 
-	file_content, _ := ioutil.ReadFile("README.md")
+	fileContent, _ := ioutil.ReadFile("README.md")
 
 	// Origing and Replay server initialization
-	origin := startHTTP(func(req *http.Request) {
-		defer req.Body.Close()
-		ioutil.ReadAll(req.Body)
+	origin := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer r.Body.Close()
+		ioutil.ReadAll(r.Body)
 
 		wg.Done()
-	})
+	}))
 
-	origin_address := strings.Replace(origin.Addr().String(), "[::]", "127.0.0.1", -1)
+	originAddr := strings.Replace(origin.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+	input := NewRAWInput(originAddr, EnginePcap, true, time.Second, "")
+	defer input.Close()
 
-	input := NewRAWInput(origin_address)
+	replay := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer r.Body.Close()
+		body, _ := ioutil.ReadAll(r.Body)
 
-	listener := startHTTP(func(req *http.Request) {
-		defer req.Body.Close()
-		body, _ := ioutil.ReadAll(req.Body)
-
-		if !bytes.Equal(body, file_content) {
-			buf, _ := httputil.DumpRequest(req, true)
+		if !bytes.Equal(body, fileContent) {
+			buf, _ := httputil.DumpRequest(r, true)
 			t.Error("Wrong POST body:", string(buf))
 		}
 
 		wg.Done()
-	})
-	replay_address := listener.Addr().String()
+	}))
+	defer replay.Close()
 
-	http_output := NewHTTPOutput(replay_address, &HTTPOutputConfig{Debug: true})
+	httpOutput := NewHTTPOutput(replay.URL, &HTTPOutputConfig{Debug: true})
 
 	Plugins.Inputs = []io.Reader{input}
-	Plugins.Outputs = []io.Writer{http_output}
+	Plugins.Outputs = []io.Writer{httpOutput}
 
 	go Start(quit)
 
 	wg.Add(2)
 
-	curl := exec.Command("curl", "http://"+origin_address, "--header", "Transfer-Encoding: chunked", "--data-binary", "@README.md")
+	curl := exec.Command("curl", "http://"+originAddr, "--header", "Transfer-Encoding: chunked", "--header", "Expect:", "--data-binary", "@README.md")
 	err := curl.Run()
 	if err != nil {
 		log.Fatal(err)
@@ -150,3 +300,124 @@ func TestInputRAWChunkedEncoding(t *testing.T) {
 
 	close(quit)
 }
+
+func TestInputRAWLargePayload(t *testing.T) {
+	// FIXME: Large payloads does not work for travis for some reason...
+	if os.Getenv("TRAVIS_BUILD_DIR") != "" {
+		return
+	}
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+	sizeB := 100 * 1000
+
+	// Generate 100kb file
+	dd := exec.Command("dd", "if=/dev/urandom", "of=/tmp/large", "bs=1", "count="+strconv.Itoa(sizeB))
+	err := dd.Run()
+	if err != nil {
+		log.Fatal("dd error:", err)
+	}
+
+	origin := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		defer req.Body.Close()
+		body, _ := ioutil.ReadAll(req.Body)
+
+		if len(body) != sizeB {
+			t.Error("File size should be 1mb:", len(body))
+		}
+
+		wg.Done()
+	}))
+	originAddr := strings.Replace(origin.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+
+	input := NewRAWInput(originAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	replay := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		body, _ := ioutil.ReadAll(req.Body)
+		// // req.Body = http.MaxBytesReader(w, req.Body, 1*1024*1024)
+		// // buf := make([]byte, 1*1024*1024)
+		// n, _ := req.Body.Read(buf)
+		// body := buf[0:n]
+
+		if len(body) != sizeB {
+			t.Errorf("File size should be %d bytes: %d", sizeB, len(body))
+		}
+
+		wg.Done()
+	}))
+	defer replay.Close()
+
+	httpOutput := NewHTTPOutput(replay.URL, &HTTPOutputConfig{Debug: false})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{httpOutput}
+
+	go Start(quit)
+
+	wg.Add(2)
+	curl := exec.Command("curl", "http://"+originAddr, "--header", "Transfer-Encoding: chunked", "--header", "Expect:", "--data-binary", "@/tmp/large")
+	err = curl.Run()
+	if err != nil {
+		log.Fatal("curl error:", err)
+	}
+
+	wg.Wait()
+	close(quit)
+}
+
+func BenchmarkRAWInput(b *testing.B) {
+	quit := make(chan int)
+
+	origin := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
+	defer origin.Close()
+	originAddr := strings.Replace(origin.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+
+	var respCounter, reqCounter int64
+
+	input := NewRAWInput(originAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	output := NewTestOutput(func(data []byte) {
+		if data[0] == '1' {
+			atomic.AddInt64(&reqCounter, 1)
+		} else {
+			atomic.AddInt64(&respCounter, 1)
+		}
+
+		// log.Println("Captured ", reqCounter, "requests and ", respCounter, " responses")
+	})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	emitted := 0
+	fileContent, _ := ioutil.ReadFile("LICENSE.txt")
+
+	for i := 0; i < b.N; i++ {
+		wg := new(sync.WaitGroup)
+		wg.Add(10 * 100)
+		emitted += 10 * 100
+		for w := 0; w < 100; w++ {
+			go func() {
+				client := NewHTTPClient(origin.URL, &HTTPClientConfig{})
+				for i := 0; i < 10; i++ {
+					if rand.Int63n(2) == 0 {
+						client.Post("/", fileContent)
+					} else {
+						client.Get("/")
+					}
+					time.Sleep(time.Duration(rand.Int63n(50)) * time.Millisecond)
+					wg.Done()
+				}
+			}()
+		}
+		wg.Wait()
+	}
+
+	time.Sleep(400 * time.Millisecond)
+	log.Println("Emitted ", emitted, ", Captured ", reqCounter, "requests and ", respCounter, " responses")
+
+	close(quit)
+}

input_tcp.go

@@ -2,25 +2,25 @@ package main
 
 import (
 	"bufio"
-	"encoding/hex"
+	"bytes"
 	"fmt"
+	"io"
 	"log"
 	"net"
 	"os"
 )
 
-// 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
 	listener net.Listener
 }
 
+// NewTCPInput constructor for TCPInput, accepts address with port
 func NewTCPInput(address string) (i *TCPInput) {
 	i = new(TCPInput)
-	i.data = make(chan []byte)
+	i.data = make(chan []byte, 1000)
 	i.address = address
 
 	i.listen(address)
@@ -60,19 +60,32 @@ func (i *TCPInput) listen(address string) {
 func (i *TCPInput) handleConnection(conn net.Conn) {
 	defer conn.Close()
 
+	payloadSeparatorAsBytes := []byte(payloadSeparator)
 	reader := bufio.NewReader(conn)
-	scanner := bufio.NewScanner(reader)
+	var buffer bytes.Buffer
 
-	for scanner.Scan() {
-		encodedPayload := scanner.Bytes()
-		// Hex encoding always 2x number of bytes
-		decoded := make([]byte, len(encodedPayload)/2)
-		hex.Decode(decoded, encodedPayload)
-		i.data <- decoded
-	}
+	for {
+		line, err := reader.ReadBytes('\n')
 
-	if err := scanner.Err(); err != nil {
-		fmt.Fprintln(os.Stderr, "Unexpected error in input tcp connection:", err)
+		if err != nil {
+			if err != io.EOF {
+				fmt.Fprintln(os.Stderr, "Unexpected error in input tcp connection:", err)
+			}
+			break
+
+		}
+
+		if bytes.Equal(payloadSeparatorAsBytes[1:], line) {
+			asBytes := buffer.Bytes()
+			buffer.Reset()
+
+			newBuf := make([]byte, len(asBytes)-1)
+			copy(newBuf, asBytes)
+
+			i.data <- newBuf
+		} else {
+			buffer.Write(line)
+		}
 	}
 }
 

input_tcp_test.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/hex"
 	"io"
 	"log"
 	"net"
@@ -13,7 +12,7 @@ func TestTCPInput(t *testing.T) {
 	wg := new(sync.WaitGroup)
 	quit := make(chan int)
 
-	input := NewTCPInput(":0")
+	input := NewTCPInput("127.0.0.1:0")
 	output := NewTestOutput(func(data []byte) {
 		wg.Done()
 	})
@@ -35,79 +34,15 @@ func TestTCPInput(t *testing.T) {
 		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)
-
-		encoded := make([]byte, len(msg)*2+1)
-		hex.Encode(encoded, msg)
-		conn.Write(append(encoded, '\n'))
+		conn.Write(msg)
+		conn.Write([]byte(payloadSeparator))
 	}
 
 	wg.Wait()
 
 	close(quit)
 }
-
-func BenchmarkTCPInput(b *testing.B) {
-	wg := new(sync.WaitGroup)
-	quit := make(chan int)
-
-	input := NewTCPInput(":0")
-	output := NewTestOutput(func(data []byte) {
-		wg.Done()
-	})
-
-	Plugins.Inputs = []io.Reader{input}
-	Plugins.Outputs = []io.Writer{output}
-
-	go Start(quit)
-
-	tcpAddr, err := net.ResolveTCPAddr("tcp", input.listener.Addr().String())
-
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	var connections []net.Conn
-
-	// 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++ {
-		wg.Add(1)
-		dataChan <- msg
-	}
-
-	wg.Wait()
-
-	for _, conn := range connections {
-		conn.Close()
-	}
-
-	close(quit)
-}

limiter.go

@@ -9,6 +9,7 @@ import (
 	"time"
 )
 
+// Limiter is a wrapper for input or output plugin which adds rate limiting
 type Limiter struct {
 	plugin    interface{}
 	limit     int
@@ -30,6 +31,8 @@ func parseLimitOptions(options string) (limit int, isPercent bool) {
 	return
 }
 
+// NewLimiter constructor for Limiter, accepts plugin and options
+// `options` allow to sprcify relatve or absolute limiting
 func NewLimiter(plugin interface{}, options string) io.ReadWriter {
 	l := new(Limiter)
 	l.limit, l.isPercent = parseLimitOptions(options)

middleware.go

@@ -0,0 +1,125 @@
+package main
+
+import (
+	"bufio"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"os/exec"
+	"strings"
+	"sync"
+)
+
+type Middleware struct {
+	command string
+
+	data chan []byte
+
+	mu sync.Mutex
+
+	Stdin  io.Writer
+	Stdout io.Reader
+}
+
+func NewMiddleware(command string) *Middleware {
+	m := new(Middleware)
+	m.command = command
+	m.data = make(chan []byte, 1000)
+
+	commands := strings.Split(command, " ")
+	cmd := exec.Command(commands[0], commands[1:]...)
+
+	m.Stdout, _ = cmd.StdoutPipe()
+	m.Stdin, _ = cmd.StdinPipe()
+
+	if Settings.verbose {
+		cmd.Stderr = os.Stderr
+	}
+
+	go m.read(m.Stdout)
+
+	go func() {
+		err := cmd.Start()
+
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		err = cmd.Wait()
+
+		if err != nil {
+			log.Fatal(err)
+		}
+	}()
+
+	return m
+}
+
+func (m *Middleware) ReadFrom(plugin io.Reader) {
+	Debug("[MIDDLEWARE-MASTER] Starting reading from", plugin)
+	go m.copy(m.Stdin, plugin)
+}
+
+func (m *Middleware) copy(to io.Writer, from io.Reader) {
+	buf := make([]byte, 5*1024*1024)
+	dst := make([]byte, len(buf)*2)
+
+	for {
+		nr, _ := from.Read(buf)
+		if nr > 0 && len(buf) > nr {
+
+			hex.Encode(dst, buf[0:nr])
+			dst[nr*2] = '\n'
+
+			m.mu.Lock()
+			to.Write(dst[0 : nr*2+1])
+			m.mu.Unlock()
+
+			if Settings.debug {
+				Debug("[MIDDLEWARE-MASTER] Sending:", string(buf[0:nr]), "From:", from)
+			}
+		}
+	}
+}
+
+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 e == io.EOF {
+				continue
+			} else {
+				break
+			}
+		}
+
+		buf := make([]byte, len(line)/2)
+		if _, err := hex.Decode(buf, line[:len(line)-1]); err != nil {
+			fmt.Fprintln(os.Stderr, "Failed to decode input payload", err, len(line))
+		}
+
+		if Settings.debug {
+			Debug("[MIDDLEWARE-MASTER] Received:", string(buf))
+		}
+
+		m.data <- buf
+	}
+
+	return
+}
+
+func (m *Middleware) Read(data []byte) (int, error) {
+	buf := <-m.data
+	copy(data, buf)
+
+	return len(buf), nil
+}
+
+func (m *Middleware) String() string {
+	return fmt.Sprintf("Modifying traffic using '%s' command", m.command)
+}

middleware_test.go

@@ -0,0 +1,220 @@
+package main
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/hex"
+	"github.com/buger/gor/proto"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+type fakeServiceCb func(string, int, []byte)
+
+// Simple service that generate token on request, and require this token for accesing to secure area
+func NewFakeSecureService(wg *sync.WaitGroup, cb fakeServiceCb) *httptest.Server {
+	active_tokens := make([]string, 0)
+	var mu sync.Mutex
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		mu.Lock()
+		defer mu.Unlock()
+		Debug("Received request: " + req.URL.String())
+
+		switch req.URL.Path {
+		case "/token":
+			// Generate random token
+			token_length := 10
+			buf := make([]byte, token_length)
+			rand.Read(buf)
+			token := hex.EncodeToString(buf)
+			active_tokens = append(active_tokens, token)
+
+			w.Write([]byte(token))
+
+			cb(req.URL.Path, 200, []byte(token))
+		case "/secure":
+			token := req.URL.Query().Get("token")
+			token_found := false
+
+			for _, t := range active_tokens {
+				if t == token {
+					token_found = true
+					break
+				}
+			}
+
+			if token_found {
+				w.WriteHeader(http.StatusAccepted)
+				cb(req.URL.Path, 202, []byte(nil))
+			} else {
+				w.WriteHeader(http.StatusForbidden)
+				cb(req.URL.Path, 403, []byte(nil))
+			}
+		}
+
+		wg.Done()
+	}))
+
+	return server
+}
+
+func TestFakeSecureService(t *testing.T) {
+	var resp, token []byte
+
+	wg := new(sync.WaitGroup)
+
+	server := NewFakeSecureService(wg, func(path string, status int, resp []byte) {
+	})
+	defer server.Close()
+
+	wg.Add(3)
+
+	client := NewHTTPClient(server.URL, &HTTPClientConfig{Debug: true})
+	resp, _ = client.Get("/token")
+	token = proto.Body(resp)
+
+	// Right token
+	resp, _ = client.Get("/secure?token=" + string(token))
+	if !bytes.Equal(proto.Status(resp), []byte("202")) {
+		t.Error("Valid token should return status 202:", string(proto.Status(resp)))
+	}
+
+	// Wrong tokens forbidden
+	resp, _ = client.Get("/secure?token=wrong")
+	if !bytes.Equal(proto.Status(resp), []byte("403")) {
+		t.Error("Wrong token should returns status 403:", string(proto.Status(resp)))
+	}
+
+	wg.Wait()
+}
+
+func TestEchoMiddleware(t *testing.T) {
+	wg := new(sync.WaitGroup)
+
+	from := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Env", "prod")
+		w.Header().Set("RequestPath", r.URL.Path)
+		wg.Done()
+	}))
+	defer from.Close()
+
+	to := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Env", "test")
+		w.Header().Set("RequestPath", r.URL.Path)
+		wg.Done()
+	}))
+	defer to.Close()
+
+	quit := make(chan int)
+
+	Settings.middleware = "./examples/middleware/echo.sh"
+
+	// Catch traffic from one service
+	fromAddr := strings.Replace(from.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+	input := NewRAWInput(fromAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	// And redirect to another
+	output := NewHTTPOutput(to.URL, &HTTPOutputConfig{Debug: false})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	// Start Gor
+	go Start(quit)
+
+	// Wait till middleware initialization
+	time.Sleep(100 * time.Millisecond)
+
+	// Should receive 2 requests from original + 2 from replayed
+	client := NewHTTPClient(from.URL, &HTTPClientConfig{Debug: false})
+
+	for i := 0; i < 10; i++ {
+		wg.Add(4)
+		// Request should be echoed
+		client.Get("/a")
+		time.Sleep(5 * time.Millisecond)
+		client.Get("/b")
+		time.Sleep(5 * time.Millisecond)
+	}
+
+	wg.Wait()
+	close(quit)
+	time.Sleep(200 * time.Millisecond)
+
+	Settings.middleware = ""
+}
+
+func TestTokenMiddleware(t *testing.T) {
+	var resp, token []byte
+
+	wg := new(sync.WaitGroup)
+
+	from := NewFakeSecureService(wg, func(path string, status int, tok []byte) {
+		time.Sleep(10 * time.Millisecond)
+	})
+	defer from.Close()
+
+	to := NewFakeSecureService(wg, func(path string, status int, tok []byte) {
+		switch path {
+		case "/secure":
+			if status != 202 {
+				t.Error("Server should receive valid rewritten token")
+			}
+		}
+
+		time.Sleep(10 * time.Millisecond)
+	})
+	defer to.Close()
+
+	quit := make(chan int)
+
+	Settings.middleware = "go run ./examples/middleware/token_modifier.go"
+
+	fromAddr := strings.Replace(from.Listener.Addr().String(), "[::]", "127.0.0.1", -1)
+	// Catch traffic from one service
+	input := NewRAWInput(fromAddr, EnginePcap, true, testRawExpire, "")
+	defer input.Close()
+
+	// And redirect to another
+	output := NewHTTPOutput(to.URL, &HTTPOutputConfig{Debug: true})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	// Start Gor
+	go Start(quit)
+
+	// Wait for middleware to initialize
+	// Give go compiller time to build programm
+	time.Sleep(500 * time.Millisecond)
+
+	// Should receive 2 requests from original + 2 from replayed
+	wg.Add(4)
+
+	client := NewHTTPClient(from.URL, &HTTPClientConfig{Debug: true})
+
+	// Sending traffic to original service
+	resp, _ = client.Get("/token")
+	token = proto.Body(resp)
+
+	// When delay is too smal, middleware does not always rewrite requests in time
+	// Hopefuly client will have delay more then 100ms :)
+	time.Sleep(100 * time.Millisecond)
+
+	resp, _ = client.Get("/secure?token=" + string(token))
+	if !bytes.Equal(proto.Status(resp), []byte("202")) {
+		t.Error("Valid token should return 202:", proto.Status(resp))
+	}
+
+	wg.Wait()
+	close(quit)
+	time.Sleep(100 * time.Millisecond)
+	Settings.middleware = ""
+}

output_dummy.go

@@ -4,17 +4,19 @@ import (
 	"fmt"
 )
 
+// DummyOutput used for debugging, prints all incoming requests
 type DummyOutput struct {
 }
 
-func NewDummyOutput(options string) (di *DummyOutput) {
+// NewDummyOutput constructor for DummyOutput
+func NewDummyOutput() (di *DummyOutput) {
 	di = new(DummyOutput)
 
 	return
 }
 
 func (i *DummyOutput) Write(data []byte) (int, error) {
-	fmt.Println("Writing message: ", string(data))
+	fmt.Println(string(data))
 
 	return len(data), nil
 }

output_file.go

@@ -1,52 +1,241 @@
 package main
 
 import (
-	"encoding/gob"
+	"bufio"
+	"compress/gzip"
+	"fmt"
 	"io"
 	"log"
 	"os"
+	"path/filepath"
+	"runtime/debug"
+	"sort"
+	"strconv"
+	"strings"
+	"sync"
 	"time"
 )
 
-type RawRequest struct {
-	Timestamp int64
-	Request   []byte
+var dateFileNameFuncs = map[string]func() string{
+	"%Y":  func() string { return time.Now().Format("2006") },
+	"%m":  func() string { return time.Now().Format("01") },
+	"%d":  func() string { return time.Now().Format("02") },
+	"%H":  func() string { return time.Now().Format("15") },
+	"%M":  func() string { return time.Now().Format("04") },
+	"%S":  func() string { return time.Now().Format("05") },
+	"%NS": func() string { return fmt.Sprint(time.Now().Nanosecond()) },
 }
 
+type FileOutputConfig struct {
+	flushInterval time.Duration
+	sizeLimit     unitSizeVar
+	queueLimit    int
+	append        bool
+}
+
+// FileOutput output plugin
 type FileOutput struct {
-	path    string
-	encoder *gob.Encoder
-	file    *os.File
+	mu           sync.Mutex
+	pathTemplate string
+	currentName  string
+	file         *os.File
+	queueLength  int
+	chunkSize    int
+	writer       io.Writer
+
+	config *FileOutputConfig
 }
 
-func NewFileOutput(path string) io.Writer {
+// NewFileOutput constructor for FileOutput, accepts path
+func NewFileOutput(pathTemplate string, config *FileOutputConfig) *FileOutput {
 	o := new(FileOutput)
-	o.path = path
-	o.Init(path)
+	o.pathTemplate = pathTemplate
+	o.config = config
+	o.updateName()
+
+	go func() {
+		for {
+			time.Sleep(time.Second)
+			o.updateName()
+		}
+	}()
 
 	return o
 }
 
-func (o *FileOutput) Init(path string) {
-	var err error
+func getFileIndex(name string) int {
+	ext := filepath.Ext(name)
+	withoutExt := strings.TrimSuffix(name, ext)
 
-	o.file, err = os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
-
-	if err != nil {
-		log.Fatal(o, "Cannot open file %q. Error: %s", path, err)
+	if idx := strings.LastIndex(withoutExt, "_"); idx != -1 {
+		if i, err := strconv.Atoi(withoutExt[idx+1:]); err == nil {
+			return i
+		}
 	}
 
-	o.encoder = gob.NewEncoder(o.file)
+	return -1
+}
+
+func setFileIndex(name string, idx int) string {
+	idxS := strconv.Itoa(idx)
+	ext := filepath.Ext(name)
+	withoutExt := strings.TrimSuffix(name, ext)
+
+	if i := strings.LastIndex(withoutExt, "_"); i != -1 {
+		if _, err := strconv.Atoi(withoutExt[i+1:]); err == nil {
+			withoutExt = withoutExt[:i]
+		}
+	}
+
+	return withoutExt + "_" + idxS + ext
+}
+
+func withoutIndex(s string) string {
+	if i := strings.LastIndex(s, "_"); i != -1 {
+		return s[:i]
+	}
+
+	return s
+}
+
+type sortByFileIndex []string
+
+func (s sortByFileIndex) Len() int {
+	return len(s)
+}
+
+func (s sortByFileIndex) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+func (s sortByFileIndex) Less(i, j int) bool {
+	if withoutIndex(s[i]) == withoutIndex(s[j]) {
+		return getFileIndex(s[i]) < getFileIndex(s[j])
+	}
+
+	return s[i] < s[j]
+}
+
+func (o *FileOutput) filename() string {
+	defer o.mu.Unlock()
+	o.mu.Lock()
+
+	path := o.pathTemplate
+
+	for name, fn := range dateFileNameFuncs {
+		path = strings.Replace(path, name, fn(), -1)
+	}
+
+	if !o.config.append {
+		nextChunk := false
+
+		if o.currentName == "" ||
+			((o.config.queueLimit > 0 && o.queueLength >= o.config.queueLimit) ||
+				(o.config.sizeLimit > 0 && o.chunkSize >= int(o.config.sizeLimit))) {
+			nextChunk = true
+		}
+
+		ext := filepath.Ext(path)
+		withoutExt := strings.TrimSuffix(path, ext)
+
+		if matches, err := filepath.Glob(withoutExt + "*" + ext); err == nil {
+			if len(matches) == 0 {
+				return setFileIndex(path, 0)
+			}
+			sort.Sort(sortByFileIndex(matches))
+
+			last := matches[len(matches)-1]
+
+			fileIndex := 0
+			if idx := getFileIndex(last); idx != -1 {
+				fileIndex = idx
+
+				if nextChunk {
+					fileIndex++
+				}
+			}
+
+			return setFileIndex(last, fileIndex)
+		}
+	}
+
+	return path
+}
+
+func (o *FileOutput) updateName() {
+	o.currentName = filepath.Clean(o.filename())
 }
 
 func (o *FileOutput) Write(data []byte) (n int, err error) {
-	raw := RawRequest{time.Now().UnixNano(), data}
+	if !isOriginPayload(data) {
+		return len(data), nil
+	}
 
-	o.encoder.Encode(raw)
+	if o.file == nil || o.currentName != o.file.Name() {
+		o.mu.Lock()
+		o.Close()
+
+		o.file, err = os.OpenFile(o.currentName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
+		o.file.Sync()
+
+		if strings.HasSuffix(o.currentName, ".gz") {
+			o.writer = gzip.NewWriter(o.file)
+		} else {
+			o.writer = bufio.NewWriter(o.file)
+		}
+
+		if err != nil {
+			log.Fatal(o, "Cannot open file %q. Error: %s", o.currentName, err)
+		}
+
+		o.queueLength = 0
+		o.mu.Unlock()
+	}
+
+	o.writer.Write(data)
+	o.writer.Write([]byte(payloadSeparator))
+
+	o.queueLength++
 
 	return len(data), nil
 }
 
+func (o *FileOutput) flush() {
+	// Don't exit on panic
+	defer func() {
+		if r := recover(); r != nil {
+			log.Println("PANIC while file flush: ", r, o, string(debug.Stack()))
+		}
+	}()
+
+	defer o.mu.Unlock()
+	o.mu.Lock()
+
+	if o.file != nil {
+		if strings.HasSuffix(o.currentName, ".gz") {
+			o.writer.(*gzip.Writer).Flush()
+		} else {
+			o.writer.(*bufio.Writer).Flush()
+		}
+
+		if stat, err := o.file.Stat(); err != nil {
+			o.chunkSize = int(stat.Size())
+		}
+	}
+}
+
 func (o *FileOutput) String() string {
-	return "File output: " + o.path
+	return "File output: " + o.file.Name()
+}
+
+func (o *FileOutput) Close() error {
+	if o.file != nil {
+		if strings.HasSuffix(o.currentName, ".gz") {
+			o.writer.(*gzip.Writer).Close()
+		} else {
+			o.writer.(*bufio.Writer).Flush()
+		}
+		o.file.Close()
+	}
+	return nil
 }

output_file_settings.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"strconv"
+	"strings"
+)
+
+var dataUnitMap = map[byte]int64{
+	'k': 1024,
+	'm': 1024 * 1024,
+	'g': 1024 * 1024 * 1024,
+}
+
+func parseDataUnit(s string) int64 {
+	// Allow kb, mb, gb
+	if strings.HasSuffix(s, "b") {
+		s = s[:len(s)-1]
+	}
+
+	if unit, ok := dataUnitMap[s[len(s)-1]]; ok {
+		size, _ := strconv.ParseInt(s[:len(s)-1], 10, 64)
+		return unit * size
+	} else {
+		// If no unit specified use bytes
+		size, _ := strconv.ParseInt(s, 10, 64)
+		return size
+	}
+}
+
+type unitSizeVar int64
+
+func (u unitSizeVar) String() string {
+	return strconv.Itoa(int(u))
+}
+
+func (u unitSizeVar) Set(s string) error {
+	u = unitSizeVar(parseDataUnit(s))
+	return nil
+}

output_file_test.go

@@ -1,9 +1,16 @@
 package main
 
 import (
+	"fmt"
 	"io"
+	"math/rand"
+	"os"
+	"reflect"
+	"sort"
 	"sync"
+	"sync/atomic"
 	"testing"
+	"time"
 )
 
 func TestFileOutput(t *testing.T) {
@@ -11,7 +18,7 @@ func TestFileOutput(t *testing.T) {
 	quit := make(chan int)
 
 	input := NewTestInput()
-	output := NewFileOutput("/tmp/test_requests.gor")
+	output := NewFileOutput("/tmp/test_requests.gor", &FileOutputConfig{flushInterval: time.Minute, append: true})
 
 	Plugins.Inputs = []io.Reader{input}
 	Plugins.Outputs = []io.Writer{output}
@@ -23,12 +30,17 @@ func TestFileOutput(t *testing.T) {
 		input.EmitGET()
 		input.EmitPOST()
 	}
+	time.Sleep(100 * time.Millisecond)
+	output.flush()
+
 	close(quit)
 
 	quit = make(chan int)
 
-	input2 := NewFileInput("/tmp/test_requests.gor")
+	var counter int64
+	input2 := NewFileInput("/tmp/test_requests.gor", false)
 	output2 := NewTestOutput(func(data []byte) {
+		atomic.AddInt64(&counter, 1)
 		wg.Done()
 	})
 
@@ -40,3 +52,234 @@ func TestFileOutput(t *testing.T) {
 	wg.Wait()
 	close(quit)
 }
+
+func TestFileOutputWithNameCleaning(t *testing.T) {
+	output := &FileOutput{pathTemplate: "./test_requests.gor", config: &FileOutputConfig{flushInterval: time.Minute, append: false}}
+	expectedFileName := "test_requests_0.gor"
+	output.updateName()
+
+	if expectedFileName != output.currentName {
+		t.Errorf("Expected path %s but got %s", expectedFileName, output.currentName)
+	}
+
+}
+
+func TestFileOutputPathTemplate(t *testing.T) {
+	output := &FileOutput{pathTemplate: "/tmp/log-%Y-%m-%d-%S", config: &FileOutputConfig{flushInterval: time.Minute, append: true}}
+	now := time.Now()
+	expectedPath := fmt.Sprintf("/tmp/log-%s-%s-%s-%s", now.Format("2006"), now.Format("01"), now.Format("02"), now.Format("05"))
+	path := output.filename()
+
+	if expectedPath != path {
+		t.Errorf("Expected path %s but got %s", expectedPath, path)
+	}
+}
+
+func TestFileOutputMultipleFiles(t *testing.T) {
+	output := NewFileOutput("/tmp/log-%Y-%m-%d-%S", &FileOutputConfig{append: true, flushInterval: time.Minute})
+
+	if output.file != nil {
+		t.Error("Should not initialize file if no writes")
+	}
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name1 := output.file.Name()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name2 := output.file.Name()
+
+	time.Sleep(time.Second)
+	output.updateName()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name3 := output.file.Name()
+
+	if name2 != name1 {
+		t.Error("Fast changes should happen in same file:", name1, name2, name3)
+	}
+
+	if name3 == name1 {
+		t.Error("File name should change:", name1, name2, name3)
+	}
+
+	os.Remove(name1)
+	os.Remove(name3)
+}
+
+func TestFileOutputCompression(t *testing.T) {
+	output := NewFileOutput("/tmp/log-%Y-%m-%d-%S.gz", &FileOutputConfig{append: true, flushInterval: time.Minute})
+
+	if output.file != nil {
+		t.Error("Should not initialize file if no writes")
+	}
+
+	for i := 0; i < 1000; i++ {
+		output.Write([]byte("1 1 1\r\ntest"))
+	}
+
+	name := output.file.Name()
+	output.Close()
+
+	s, _ := os.Stat(name)
+	if s.Size() == 12*1000 {
+		t.Error("Should be compressed file:", s.Size())
+	}
+
+	os.Remove(name)
+}
+
+func TestParseDataUnit(t *testing.T) {
+	var tests = []struct {
+		value string
+		size  int64
+	}{
+		{"100kb", dataUnitMap['k'] * 100},
+		{"100k", dataUnitMap['k'] * 100},
+		{"1kb", dataUnitMap['k']},
+		{"1g", dataUnitMap['g']},
+		{"10m", dataUnitMap['m'] * 10},
+		{"zsaa312", 0},
+	}
+
+	for _, c := range tests {
+		if parseDataUnit(c.value) != c.size {
+			t.Error(c.value, "should be", c.size, "instead", parseDataUnit(c.value))
+		}
+	}
+}
+
+func TestGetFileIndex(t *testing.T) {
+	var tests = []struct {
+		path  string
+		index int
+	}{
+		{"/tmp/logs", -1},
+		{"/tmp/logs_1", 1},
+		{"/tmp/logs_2.gz", 2},
+		{"/tmp/logs_0.gz", 0},
+	}
+
+	for _, c := range tests {
+		if getFileIndex(c.path) != c.index {
+			t.Error(c.path, "should be", c.index, "instead", getFileIndex(c.path))
+		}
+	}
+}
+
+func TestSetFileIndex(t *testing.T) {
+	var tests = []struct {
+		path    string
+		index   int
+		newPath string
+	}{
+		{"/tmp/logs", 0, "/tmp/logs_0"},
+		{"/tmp/logs.gz", 1, "/tmp/logs_1.gz"},
+		{"/tmp/logs_1", 0, "/tmp/logs_0"},
+		{"/tmp/logs_0", 10, "/tmp/logs_10"},
+		{"/tmp/logs_0.gz", 10, "/tmp/logs_10.gz"},
+		{"/tmp/logs_underscores.gz", 10, "/tmp/logs_underscores_10.gz"},
+	}
+
+	for _, c := range tests {
+		if setFileIndex(c.path, c.index) != c.newPath {
+			t.Error(c.path, "should be", c.newPath, "instead", setFileIndex(c.path, c.index))
+		}
+	}
+}
+
+func TestFileOutputAppendQueueLimitOverflow(t *testing.T) {
+	rnd := rand.Int63()
+	name := fmt.Sprintf("/tmp/%d", rnd)
+
+	output := NewFileOutput(name, &FileOutputConfig{append: false, flushInterval: time.Minute, queueLimit: 2})
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name1 := output.file.Name()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name2 := output.file.Name()
+
+	output.updateName()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name3 := output.file.Name()
+
+	if name2 != name1 || name1 != fmt.Sprintf("/tmp/%d_0", rnd) {
+		t.Error("Fast changes should happen in same file:", name1, name2, name3)
+	}
+
+	if name3 == name1 || name3 != fmt.Sprintf("/tmp/%d_1", rnd) {
+		t.Error("File name should change:", name1, name2, name3)
+	}
+
+	os.Remove(name1)
+	os.Remove(name3)
+}
+
+func TestFileOutputAppendQueueLimitNoOverflow(t *testing.T) {
+	rnd := rand.Int63()
+	name := fmt.Sprintf("/tmp/%d", rnd)
+
+	output := NewFileOutput(name, &FileOutputConfig{append: false, flushInterval: time.Minute, queueLimit: 3})
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name1 := output.file.Name()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name2 := output.file.Name()
+
+	output.updateName()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name3 := output.file.Name()
+
+	if name2 != name1 || name1 != fmt.Sprintf("/tmp/%d_0", rnd) {
+		t.Error("Fast changes should happen in same file:", name1, name2, name3)
+	}
+
+	if name3 != name1 || name3 != fmt.Sprintf("/tmp/%d_0", rnd) {
+		t.Error("File name should not change:", name1, name2, name3)
+	}
+
+	os.Remove(name1)
+	os.Remove(name3)
+}
+
+func TestFileOutputAppendQueueLimitGzips(t *testing.T) {
+	rnd := rand.Int63()
+	name := fmt.Sprintf("/tmp/%d.gz", rnd)
+
+	output := NewFileOutput(name, &FileOutputConfig{append: false, flushInterval: time.Minute, queueLimit: 2})
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name1 := output.file.Name()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name2 := output.file.Name()
+
+	output.updateName()
+
+	output.Write([]byte("1 1 1\r\ntest"))
+	name3 := output.file.Name()
+
+	if name2 != name1 || name1 != fmt.Sprintf("/tmp/%d_0.gz", rnd) {
+		t.Error("Fast changes should happen in same file:", name1, name2, name3)
+	}
+
+	if name3 == name1 || name3 != fmt.Sprintf("/tmp/%d_1.gz", rnd) {
+		t.Error("File name should change:", name1, name2, name3)
+	}
+
+	os.Remove(name1)
+	os.Remove(name3)
+}
+
+func TestFileOutputSort(t *testing.T) {
+	var files = []string{"2016_0", "2014_10", "2015_0", "2015_10", "2015_2"}
+	var expected = []string{"2014_10", "2015_0", "2015_2", "2015_10", "2016_0"}
+	sort.Sort(sortByFileIndex(files))
+
+	if !reflect.DeepEqual(files, expected) {
+		t.Error("Should properly sort file names using indexes", files, expected)
+	}
+}

output_http.go

@@ -2,13 +2,22 @@ package main
 
 import (
 	"io"
-	"log"
 	"sync/atomic"
 	"time"
+
+	"github.com/buger/gor/proto"
 )
 
-const InitialDynamicWorkers = 10
+const initialDynamicWorkers = 10
 
+type response struct {
+	payload       []byte
+	uuid          []byte
+	roundTripTime int64
+	startedAt     int64
+}
+
+// HTTPOutputConfig struct for holding http output configuration
 type HTTPOutputConfig struct {
 	redirectLimit int
 
@@ -17,9 +26,18 @@ type HTTPOutputConfig struct {
 
 	elasticSearch string
 
+	Timeout      time.Duration
+	OriginalHost bool
+	BufferSize   int
+
 	Debug bool
+
+	TrackResponses bool
 }
 
+// HTTPOutput plugin manage pool of workers which send request to replayed server
+// By default workers pool is dynamic and starts with 10 workers
+// You can specify fixed number of workers using `--output-http-workers`
 type HTTPOutput struct {
 	// Keep this as first element of struct because it guarantees 64bit
 	// alignment. atomic.* functions crash on 32bit machines if operand is not
@@ -30,6 +48,8 @@ type HTTPOutput struct {
 	limit   int
 	queue   chan []byte
 
+	responses chan response
+
 	needWorker chan int
 
 	config *HTTPOutputConfig
@@ -39,8 +59,9 @@ type HTTPOutput struct {
 	elasticSearch *ESPlugin
 }
 
+// NewHTTPOutput constructor for HTTPOutput
+// Initialize workers
 func NewHTTPOutput(address string, config *HTTPOutputConfig) io.Writer {
-
 	o := new(HTTPOutput)
 
 	o.address = address
@@ -50,12 +71,13 @@ func NewHTTPOutput(address string, config *HTTPOutputConfig) io.Writer {
 		o.queueStats = NewGorStat("output_http")
 	}
 
-	o.queue = make(chan []byte, 100)
+	o.queue = make(chan []byte, 1000)
+	o.responses = make(chan response, 1000)
 	o.needWorker = make(chan int, 1)
 
 	// Initial workers count
 	if o.config.workers == 0 {
-		o.needWorker <- InitialDynamicWorkers
+		o.needWorker <- initialDynamicWorkers
 	} else {
 		o.needWorker <- o.config.workers
 	}
@@ -65,16 +87,20 @@ func NewHTTPOutput(address string, config *HTTPOutputConfig) io.Writer {
 		o.elasticSearch.Init(o.config.elasticSearch)
 	}
 
-	go o.WorkerMaster()
+	if len(Settings.middleware) > 0 {
+		o.config.TrackResponses = true
+	}
+
+	go o.workerMaster()
 
 	return o
 }
 
-func (o *HTTPOutput) WorkerMaster() {
+func (o *HTTPOutput) workerMaster() {
 	for {
-		new_workers := <-o.needWorker
-		for i := 0; i < new_workers; i++ {
-			go o.Worker()
+		newWorkers := <-o.needWorker
+		for i := 0; i < newWorkers; i++ {
+			go o.startWorker()
 		}
 
 		// Disable dynamic scaling if workers poll fixed size
@@ -84,13 +110,16 @@ func (o *HTTPOutput) WorkerMaster() {
 	}
 }
 
-func (o *HTTPOutput) Worker() {
+func (o *HTTPOutput) startWorker() {
 	client := NewHTTPClient(o.address, &HTTPClientConfig{
-		FollowRedirects: o.config.redirectLimit,
-		Debug:           o.config.Debug,
+		FollowRedirects:    o.config.redirectLimit,
+		Debug:              o.config.Debug,
+		OriginalHost:       o.config.OriginalHost,
+		Timeout:            o.config.Timeout,
+		ResponseBufferSize: o.config.BufferSize,
 	})
 
-	death_count := 0
+	deathCount := 0
 
 	atomic.AddInt64(&o.activeWorkers, 1)
 
@@ -98,19 +127,19 @@ func (o *HTTPOutput) Worker() {
 		select {
 		case data := <-o.queue:
 			o.sendRequest(client, data)
-			death_count = 0
+			deathCount = 0
 		case <-time.After(time.Millisecond * 100):
 			// When dynamic scaling enabled workers die after 2s of inactivity
 			if o.config.workers == 0 {
-				death_count += 1
+				deathCount++
 			} else {
 				continue
 			}
 
-			if death_count > 20 {
+			if deathCount > 20 {
 				workersCount := atomic.LoadInt64(&o.activeWorkers)
 
-				// At least 1 worker should be alive
+				// At least 1 startWorker should be alive
 				if workersCount != 1 {
 					atomic.AddInt64(&o.activeWorkers, -1)
 					return
@@ -121,6 +150,10 @@ func (o *HTTPOutput) Worker() {
 }
 
 func (o *HTTPOutput) Write(data []byte) (n int, err error) {
+	if !isRequestPayload(data) {
+		return len(data), nil
+	}
+
 	buf := make([]byte, len(data))
 	copy(buf, data)
 
@@ -141,13 +174,40 @@ func (o *HTTPOutput) Write(data []byte) (n int, err error) {
 	return len(data), nil
 }
 
+func (o *HTTPOutput) Read(data []byte) (int, error) {
+	resp := <-o.responses
+
+	Debug("[OUTPUT-HTTP] Received response:", string(resp.payload))
+
+	header := payloadHeader(ReplayedResponsePayload, resp.uuid, resp.roundTripTime, resp.startedAt)
+	copy(data[0:len(header)], header)
+	copy(data[len(header):], resp.payload)
+
+	return len(resp.payload) + len(header), nil
+}
+
 func (o *HTTPOutput) sendRequest(client *HTTPClient, request []byte) {
+	meta := payloadMeta(request)
+	if len(meta) < 2 {
+		return
+	}
+	uuid := meta[1]
+
+	body := payloadBody(request)
+	if !proto.IsHTTPPayload(body) {
+		return
+	}
+
 	start := time.Now()
-	resp, err := client.Send(request)
+	resp, err := client.Send(body)
 	stop := time.Now()
 
 	if err != nil {
-		log.Println("Request error:", err)
+		Debug("Request error:", err)
+	}
+
+	if o.config.TrackResponses {
+		o.responses <- response{resp, uuid, start.UnixNano(), stop.UnixNano() - start.UnixNano()}
 	}
 
 	if o.elasticSearch != nil {

output_http_test.go

@@ -3,7 +3,6 @@ package main
 import (
 	"io"
 	"io/ioutil"
-	"net"
 	"net/http"
 	"net/http/httptest"
 	_ "net/http/httputil"
@@ -12,25 +11,13 @@ import (
 	"time"
 )
 
-func startHTTP(cb func(*http.Request)) net.Listener {
-	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		cb(r)
-	})
-
-	listener, _ := net.Listen("tcp", ":0")
-
-	go http.Serve(listener, handler)
-
-	return listener
-}
-
 func TestHTTPOutput(t *testing.T) {
 	wg := new(sync.WaitGroup)
 	quit := make(chan int)
 
 	input := NewTestInput()
 
-	listener := startHTTP(func(req *http.Request) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
 		if req.Header.Get("User-Agent") != "Gor" {
 			t.Error("Wrong header")
 		}
@@ -49,13 +36,14 @@ func TestHTTPOutput(t *testing.T) {
 		}
 
 		wg.Done()
-	})
+	}))
+	defer server.Close()
 
 	headers := HTTPHeaders{HTTPHeader{"User-Agent", "Gor"}}
 	methods := HTTPMethods{[]byte("GET"), []byte("PUT"), []byte("POST")}
 	Settings.modifierConfig = HTTPModifierConfig{headers: headers, methods: methods}
 
-	output := NewHTTPOutput(listener.Addr().String(), &HTTPOutputConfig{})
+	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{Debug: true})
 
 	Plugins.Inputs = []io.Reader{input}
 	Plugins.Outputs = []io.Writer{output}
@@ -76,6 +64,41 @@ func TestHTTPOutput(t *testing.T) {
 	Settings.modifierConfig = HTTPModifierConfig{}
 }
 
+func TestHTTPOutputKeepOriginalHost(t *testing.T) {
+	wg := new(sync.WaitGroup)
+	quit := make(chan int)
+
+	input := NewTestInput()
+
+	server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		if req.Host != "custom-host.com" {
+			t.Error("Wrong header", req.Host)
+		}
+
+		wg.Done()
+	}))
+	defer server.Close()
+
+	headers := HTTPHeaders{HTTPHeader{"Host", "custom-host.com"}}
+	Settings.modifierConfig = HTTPModifierConfig{headers: headers}
+
+	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{Debug: false, OriginalHost: true})
+
+	Plugins.Inputs = []io.Reader{input}
+	Plugins.Outputs = []io.Writer{output}
+
+	go Start(quit)
+
+	wg.Add(1)
+	input.EmitGET()
+
+	wg.Wait()
+
+	close(quit)
+
+	Settings.modifierConfig = HTTPModifierConfig{}
+}
+
 func TestOutputHTTPSSL(t *testing.T) {
 	wg := new(sync.WaitGroup)
 	quit := make(chan int)
@@ -86,10 +109,10 @@ func TestOutputHTTPSSL(t *testing.T) {
 	}))
 
 	input := NewTestInput()
-	http_output := NewHTTPOutput(server.URL, &HTTPOutputConfig{})
+	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{})
 
 	Plugins.Inputs = []io.Reader{input}
-	Plugins.Outputs = []io.Writer{http_output}
+	Plugins.Outputs = []io.Writer{output}
 
 	go Start(quit)
 
@@ -106,13 +129,14 @@ func BenchmarkHTTPOutput(b *testing.B) {
 	wg := new(sync.WaitGroup)
 	quit := make(chan int)
 
-	listener := startHTTP(func(req *http.Request) {
+	server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		time.Sleep(50 * time.Millisecond)
 		wg.Done()
-	})
+	}))
+	defer server.Close()
 
 	input := NewTestInput()
-	output := NewHTTPOutput(listener.Addr().String(), &HTTPOutputConfig{})
+	output := NewHTTPOutput(server.URL, &HTTPOutputConfig{})
 
 	Plugins.Inputs = []io.Reader{input}
 	Plugins.Outputs = []io.Writer{output}

output_kafka.go

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"encoding/json"
+	"github.com/Shopify/sarama"
+	"github.com/buger/gor/proto"
+	"io"
+	"log"
+	"strings"
+	"time"
+)
+
+// KafkaConfig should contains required information to
+// build producers.
+type KafkaConfig struct {
+	host  string
+	topic string
+}
+
+// KafkaOutput should make producer client.
+type KafkaOutput struct {
+	config   *KafkaConfig
+	producer sarama.AsyncProducer
+}
+
+// KafkaMessage should contains catched request information that should be
+// passed as Json to Apache Kafka.
+type KafkaMessage struct {
+	ReqURL     string            `json:"Req_URL"`
+	ReqMethod  string            `json:"Req_Method"`
+	ReqBody    string            `json:"Req_Body,omitempty"`
+	ReqHeaders map[string]string `json:"Req_Headers,omitempty"`
+}
+
+// KafkaOutputFrequency in milliseconds
+const KafkaOutputFrequency = 500
+
+// NewKafkaOutput creates instance of kafka producer client.
+func NewKafkaOutput(address string, config *KafkaConfig) io.Writer {
+	c := sarama.NewConfig()
+	c.Producer.RequiredAcks = sarama.WaitForLocal
+	c.Producer.Compression = sarama.CompressionSnappy
+	c.Producer.Flush.Frequency = KafkaOutputFrequency * time.Millisecond
+
+	brokerList := strings.Split(config.host, ",")
+
+	producer, err := sarama.NewAsyncProducer(brokerList, c)
+	if err != nil {
+		log.Fatalln("Failed to start Sarama(Kafka) producer:", err)
+	}
+
+	o := &KafkaOutput{
+		config:   config,
+		producer: producer,
+	}
+
+	if Settings.verbose {
+		// Start infinite loop for tracking errors for kafka producer.
+		go o.ErrorHandler()
+	}
+
+	return o
+}
+
+// ErrorHandler should receive errors
+func (o *KafkaOutput) ErrorHandler() {
+	for err := range o.producer.Errors() {
+		log.Println("Failed to write access log entry:", err)
+	}
+}
+
+func (o *KafkaOutput) Write(data []byte) (n int, err error) {
+	headers := make(map[string]string)
+	proto.ParseHeaders([][]byte{data}, func(header []byte, value []byte) bool {
+		headers[string(header)] = string(value)
+		return true
+	})
+
+	req := payloadBody(data)
+
+	kafkaMessage := KafkaMessage{
+		ReqURL:     string(proto.Path(req)),
+		ReqMethod:  string(proto.Method(req)),
+		ReqBody:    string(proto.Body(req)),
+		ReqHeaders: headers,
+	}
+	jsonMessage, _ := json.Marshal(&kafkaMessage)
+	message := sarama.StringEncoder(jsonMessage)
+
+	o.producer.Input() <- &sarama.ProducerMessage{
+		Topic: o.config.topic,
+		Value: message,
+	}
+
+	return len(message), nil
+}

output_null.go

@@ -0,0 +1,18 @@
+package main
+
+// NullOutput used for debugging, prints nothing
+type NullOutput struct {
+}
+
+// NullOutput constructor for NullOutput
+func NewNullOutput() (o *NullOutput) {
+	return new(NullOutput)
+}
+
+func (o *NullOutput) Write(data []byte) (int, error) {
+	return len(data), nil
+}
+
+func (o *NullOutput) String() string {
+	return "Null Output"
+}

output_tcp.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/hex"
 	"fmt"
 	"io"
 	"log"
@@ -9,6 +8,9 @@ import (
 	"time"
 )
 
+// TCPOutput used for sending raw tcp payloads
+// Currently used for internal communication between listener and replay server
+// Can be used for transfering binary payloads like protocol buffers
 type TCPOutput struct {
 	address  string
 	limit    int
@@ -16,6 +18,8 @@ type TCPOutput struct {
 	bufStats *GorStat
 }
 
+// NewTCPOutput constructor for TCPOutput
+// Initialize 10 workers which hold keep-alive connection
 func NewTCPOutput(address string) io.Writer {
 	o := new(TCPOutput)
 
@@ -34,17 +38,32 @@ func NewTCPOutput(address string) io.Writer {
 }
 
 func (o *TCPOutput) worker() {
+	retries := 1
 	conn, err := o.connect(o.address)
-	for ; err != nil; conn, err = o.connect(o.address) {
-		time.Sleep(2 * time.Second)
+	for {
+		if err == nil {
+			break
+		}
+
+		log.Println("Can't connect to aggregator instance, reconnecting in 1 second. Retries:", retries)
+		time.Sleep(1 * time.Second)
+
+		conn, err = o.connect(o.address)
+		retries++
+	}
+
+	if retries > 0 {
+		log.Println("Connected to aggregator instance after ", retries, " retries")
 	}
 
 	defer conn.Close()
 
 	for {
-		_, err := conn.Write(<-o.buf)
+		conn.Write(<-o.buf)
+		_, err := conn.Write([]byte(payloadSeparator))
+
 		if err != nil {
-			log.Println("Worker failed on write, exitings and starting new worker")
+			log.Println("Lost connection with aggregator instance, reconnecting")
 			go o.worker()
 			break
 		}
@@ -52,10 +71,15 @@ func (o *TCPOutput) worker() {
 }
 
 func (o *TCPOutput) Write(data []byte) (n int, err error) {
-	// Hex encoding always 2x number of bytes
-	encoded := make([]byte, len(data)*2+1)
-	hex.Encode(encoded, data)
-	o.buf <- append(encoded, '\n')
+	if !isOriginPayload(data) {
+		return len(data), nil
+	}
+
+	// We have to copy, because sending data in multiple threads
+	newBuf := make([]byte, len(data))
+	copy(newBuf, data)
+
+	o.buf <- newBuf
 
 	if Settings.outputTCPStats {
 		o.bufStats.Write(len(o.buf))
@@ -67,10 +91,6 @@ func (o *TCPOutput) Write(data []byte) (n int, err error) {
 func (o *TCPOutput) connect(address string) (conn net.Conn, err error) {
 	conn, err = net.Dial("tcp", address)
 
-	if err != nil {
-		log.Println("Connection error ", err, o.address)
-	}
-
 	return
 }
 

output_tcp_test.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"bufio"
-	"encoding/hex"
 	"io"
 	"log"
 	"net"
@@ -36,7 +35,7 @@ func TestTCPOutput(t *testing.T) {
 }
 
 func startTCP(cb func([]byte)) net.Listener {
-	listener, err := net.Listen("tcp", ":0")
+	listener, err := net.Listen("tcp", "127.0.0.1:0")
 
 	if err != nil {
 		log.Fatal("Can't start:", err)
@@ -50,13 +49,10 @@ func startTCP(cb func([]byte)) net.Listener {
 			go func() {
 				reader := bufio.NewReader(conn)
 				scanner := bufio.NewScanner(reader)
+				scanner.Split(payloadScanner)
 
 				for scanner.Scan() {
-					encodedPayload := scanner.Bytes()
-					// Hex encoding always 2x number of bytes
-					decoded := make([]byte, len(encodedPayload)/2)
-					hex.Decode(decoded, encodedPayload)
-					cb(decoded)
+					cb(scanner.Bytes())
 				}
 			}()
 		}

plugins.go

@@ -4,31 +4,39 @@ import (
 	"io"
 	"reflect"
 	"strings"
+	"sync"
+	"time"
 )
 
+// InOutPlugins struct for holding references to plugins
 type InOutPlugins struct {
 	Inputs  []io.Reader
 	Outputs []io.Writer
+	All     []interface{}
 }
 
-type ReaderOrWriter interface{}
+var pluginMu sync.Mutex
 
+// Plugins holds all the plugin objects
 var Plugins *InOutPlugins = new(InOutPlugins)
 
+// extractLimitOptions detects if plugin get called with limiter support
+// Returns address and limit
 func extractLimitOptions(options string) (string, string) {
 	split := strings.Split(options, "|")
 
 	if len(split) > 1 {
 		return split[0], split[1]
-	} else {
-		return split[0], ""
 	}
+
+	return split[0], ""
 }
 
 // Automatically detects type of plugin and initialize it
 //
 // See this article if curious about relfect stuff below: http://blog.burntsushi.net/type-parametric-functions-golang
 func registerPlugin(constructor interface{}, options ...interface{}) {
+	var path, limit string
 	vc := reflect.ValueOf(constructor)
 
 	// Pre-processing options to make it work with reflect
@@ -37,42 +45,69 @@ func registerPlugin(constructor interface{}, options ...interface{}) {
 		vo = append(vo, reflect.ValueOf(oi))
 	}
 
-	// Removing limit options from path
-	path, limit := extractLimitOptions(vo[0].String())
+	if len(vo) > 0 {
+		// Removing limit options from path
+		path, limit = extractLimitOptions(vo[0].String())
 
-	// Writing value back without limiter "|" options
-	vo[0] = reflect.ValueOf(path)
+		// Writing value back without limiter "|" options
+		vo[0] = reflect.ValueOf(path)
+	}
 
 	// Calling our constructor with list of given options
 	plugin := vc.Call(vo)[0].Interface()
-	plugin_wrapper := plugin
+	pluginWrapper := plugin
 
 	if limit != "" {
-		plugin_wrapper = NewLimiter(plugin, limit)
+		pluginWrapper = NewLimiter(plugin, limit)
 	} else {
-		plugin_wrapper = plugin
+		pluginWrapper = plugin
 	}
 
-	if _, ok := plugin.(io.Reader); ok {
-		Plugins.Inputs = append(Plugins.Inputs, plugin_wrapper.(io.Reader))
+	_, isR := plugin.(io.Reader)
+	_, isW := plugin.(io.Writer)
+
+	// Some of the output can be Readers as well because return responses
+	if isR && !isW {
+		Plugins.Inputs = append(Plugins.Inputs, pluginWrapper.(io.Reader))
 	}
 
-	if _, ok := plugin.(io.Writer); ok {
-		Plugins.Outputs = append(Plugins.Outputs, plugin_wrapper.(io.Writer))
+	if isW {
+		Plugins.Outputs = append(Plugins.Outputs, pluginWrapper.(io.Writer))
 	}
+
+	Plugins.All = append(Plugins.All, plugin)
 }
 
+// InitPlugins specify and initialize all available plugins
 func InitPlugins() {
+	pluginMu.Lock()
+	defer pluginMu.Unlock()
+
 	for _, options := range Settings.inputDummy {
 		registerPlugin(NewDummyInput, options)
 	}
 
-	for _, options := range Settings.outputDummy {
-		registerPlugin(NewDummyOutput, options)
+	for range Settings.outputDummy {
+		registerPlugin(NewDummyOutput)
+	}
+
+	if Settings.outputStdout {
+		registerPlugin(NewDummyOutput)
+	}
+
+	if Settings.outputNull {
+		registerPlugin(NewNullOutput)
+	}
+
+	engine := EnginePcap
+	if Settings.inputRAWEngine == "raw_socket" {
+		engine = EngineRawSocket
+	} else if Settings.inputRAWEngine == "pcap_file" {
+		engine = EnginePcapFile
 	}
 
 	for _, options := range Settings.inputRAW {
-		registerPlugin(NewRAWInput, options)
+		registerPlugin(NewRAWInput, options, engine, Settings.inputRAWTrackResponse, time.Duration(0), Settings.inputRAWRealIPHeader)
 	}
 
 	for _, options := range Settings.inputTCP {
@@ -84,18 +119,31 @@ func InitPlugins() {
 	}
 
 	for _, options := range Settings.inputFile {
-		registerPlugin(NewFileInput, options)
+		registerPlugin(NewFileInput, options, Settings.inputFileLoop)
 	}
 
 	for _, options := range Settings.outputFile {
-		registerPlugin(NewFileOutput, options)
+		registerPlugin(NewFileOutput, options, &Settings.outputFileConfig)
 	}
 
 	for _, options := range Settings.inputHTTP {
 		registerPlugin(NewHTTPInput, options)
 	}
 
+	// If we explicitly set Host header http output should not rewrite it
+	// Fix: https://github.com/buger/gor/issues/174
+	for _, header := range Settings.modifierConfig.headers {
+		if header.Name == "Host" {
+			Settings.outputHTTPConfig.OriginalHost = true
+			break
+		}
+	}
+
 	for _, options := range Settings.outputHTTP {
 		registerPlugin(NewHTTPOutput, options, &Settings.outputHTTPConfig)
 	}
+
+	if Settings.outputKafkaConfig.host != "" && Settings.outputKafkaConfig.topic != "" {
+		registerPlugin(NewKafkaOutput, "", &Settings.outputKafkaConfig)
+	}
 }

proto/proto.go

@@ -1,166 +1,467 @@
-// Low-level interaction with HTTP request payload
+/*
+Package proto provides byte-level interaction with HTTP request payload.
+
+Example of HTTP payload for future references, new line symbols escaped:
+
+	POST /upload HTTP/1.1\r\n
+	User-Agent: Gor\r\n
+	Content-Length: 11\r\n
+	\r\n
+	Hello world
+
+	GET /index.html HTTP/1.1\r\n
+	User-Agent: Gor\r\n
+	\r\n
+	\r\n
+*/
 package proto
 
 import (
-    "bytes"
-    "github.com/buger/gor/byteutils"
-    _ "log"
+	"bytes"
+	"github.com/buger/gor/byteutils"
 )
 
+// In HTTP newline defined by 2 bytes (for both windows and *nix support)
 var CLRF = []byte("\r\n")
-var EMPTY_LINE = []byte("\r\n\r\n")
-var HEADER_DELIM = []byte(": ")
 
-// Headers should end with empty line
+// New line acts as separator: end of Headers or Body (in some cases)
+var EmptyLine = []byte("\r\n\r\n")
+
+// Separator for Header line. Header looks like: `HeaderName: value`
+var HeaderDelim = []byte(": ")
+
+// MIMEHeadersEndPos finds end of the Headers section, which should end with empty line.
 func MIMEHeadersEndPos(payload []byte) int {
-    return bytes.Index(payload, EMPTY_LINE)
+	return bytes.Index(payload, EmptyLine)
 }
 
+// MIMEHeadersStartPos finds start of Headers section
+// It just finds position of second line (first contains location and method).
 func MIMEHeadersStartPos(payload []byte) int {
-    return bytes.Index(payload, CLRF) + 2 // Find first line end
+	return bytes.Index(payload, CLRF) + 2 // Find first line end
 }
 
-// Find header value or return error
-// Do not support multi-line headers
-func Header(payload []byte, name []byte) (value []byte, headerStart, valueStart, headerEnd int) {
-    headerStart = bytes.Index(payload, name)
+func isLower(b byte) bool {
+	if 'a' <= b && b <= 'z' {
+		return true
+	}
 
-    if headerStart == -1 {
-        return
-    }
-
-    valueStart = headerStart + len(name) + 1 // Skip ":" after header name
-    if payload[valueStart] == ' ' { // Ignore empty space after ':'
-        valueStart += 1
-    }
-    headerEnd = valueStart + bytes.IndexByte(payload[valueStart:], '\r')
-    value = payload[valueStart:headerEnd]
-
-    return
+	return false
 }
 
-func GetHeader(payload []byte, name string) []byte {
-    val, _, _, _ := Header(payload, []byte(name))
-
-    return val
+func toUpper(b byte) byte {
+	if 'a' <= b && b <= 'z' {
+		b -= 'a' - 'A'
+	}
+	return b
 }
 
+func toLower(b byte) byte {
+	if 'A' <= b && b <= 'Z' {
+		b += 'a' - 'A'
+	}
+	return b
+}
+
+func headerIndex(payload []byte, name []byte) int {
+	isLower := isLower(name[0])
+	i := 0
+
+	for {
+		if i >= len(payload) {
+			return -1
+		}
+
+		if payload[i] == '\n' {
+			i++
+
+			// We are at the end
+			if i == len(payload) {
+				return -1
+			}
+
+			if payload[i] == name[0] ||
+				(!isLower && payload[i] == toLower(name[0])) ||
+				(isLower && payload[i] == toUpper(name[0])) {
+
+				i++
+				j := 1
+				for {
+					if j == len(name) {
+						// Matched, and return start of the header
+						return i - len(name)
+					}
+
+					if payload[i] != name[j] {
+						break
+					}
+
+					// If compound header name do one more case check: Content-Length or Transfer-Encoding
+					if name[j] == '-' {
+						i++
+						j++
+
+						if !(payload[i] == name[j] ||
+							(!isLower && payload[i] == toLower(name[j])) ||
+							(isLower && payload[i] == toUpper(name[j]))) {
+							break
+						}
+					}
+
+					j++
+					i++
+				}
+			}
+		}
+
+		i++
+	}
+
+	return -1
+}
+
+// header return value and positions of header/value start/end.
+// If not found, value will be blank, and headerStart will be -1
+// Do not support multi-line headers.
+func header(payload []byte, name []byte) (value []byte, headerStart, headerEnd, valueStart, valueEnd int) {
+	headerStart = headerIndex(payload, name)
+
+	if headerStart == -1 {
+		return
+	}
+
+	valueStart = headerStart + len(name) + 1 // Skip ":" after header name
+	headerEnd = valueStart + bytes.IndexByte(payload[valueStart:], '\n')
+
+	for valueStart < headerEnd { // Ignore empty space after ':'
+		if payload[valueStart] == ' ' {
+			valueStart++
+		} else {
+			break
+		}
+	}
+
+	valueEnd = valueStart + bytes.IndexByte(payload[valueStart:], '\n')
+
+	if payload[headerEnd-1] == '\r' {
+		valueEnd--
+	}
+
+	// ignore empty space at end of header value
+	for valueStart < valueEnd {
+		if payload[valueEnd-1] == ' ' {
+			valueEnd--
+		} else {
+			break
+		}
+	}
+	value = payload[valueStart:valueEnd]
+
+	return
+}
+
+// Works only with ASCII
+func HeadersEqual(h1 []byte, h2 []byte) bool {
+	if len(h1) != len(h2) {
+		return false
+	}
+
+	for i, c1 := range h1 {
+		c2 := h2[i]
+
+		switch int(c1) - int(c2) {
+		case 0, 32, -32:
+		default:
+			return false
+		}
+	}
+
+	return true
+}
+
+// Parsing headers from multiple payloads
+func ParseHeaders(payloads [][]byte, cb func(header []byte, value []byte) bool) {
+
+	hS := [2]int{0, 0}
+	hE := [2]int{-1, -1}
+	vS := [2]int{-1, -1}
+	vE := [2]int{-1, -1}
+
+	i := 0
+	pIdx := 0
+	lineBreaks := 0
+	newLineBreak := true
+
+	for {
+		if len(payloads)-1 < pIdx {
+			break
+		}
+
+		p := payloads[pIdx]
+
+		if len(p)-1 < i {
+			pIdx++
+			i = 0
+			continue
+		}
+
+		switch p[i] {
+		case '\r', '\n':
+			newLineBreak = true
+			lineBreaks++
+
+			// End of headers
+			if lineBreaks == 4 {
+				return
+			}
+
+			if lineBreaks > 1 {
+				break
+			}
+
+			vE = [2]int{pIdx, i}
+
+			if vS[1] != -1 && vE[1] != -1 &&
+				hS[1] != -1 && hE[1] != -1 {
+
+				var header, value []byte
+
+				phS, phE, pvS, pvE := payloads[hS[0]], payloads[hE[0]], payloads[vS[0]], payloads[vE[0]]
+
+				// If in same payload
+				if hS[0] == hE[0] {
+					header = phS[hS[1]:hE[1]]
+				} else {
+					header = make([]byte, len(phS)-hS[1]+hE[1])
+					copy(header, phS[hS[1]:])
+					copy(header[len(phS)-hS[1]:], phE[:hE[1]])
+				}
+
+				if vS[0] == vE[0] {
+					value = pvS[vS[1]:vE[1]]
+				} else {
+					value = make([]byte, len(pvS)-vS[1]+vE[1])
+					copy(value, pvS[vS[1]:])
+					copy(value[len(pvS)-vS[1]:], pvE[:vE[1]])
+				}
+
+				if !cb(header, value) {
+					return
+				}
+			}
+
+			// Header found, reset values
+			vS = [2]int{-1, -1}
+			vE = [2]int{-1, -1}
+			hS = [2]int{-1, -1}
+			hE = [2]int{-1, -1}
+		case ':':
+			if newLineBreak {
+				hE = [2]int{pIdx, i}
+				newLineBreak = false
+			}
+		default:
+			lineBreaks = 0
+
+			if hS[1] == -1 {
+				hS = [2]int{pIdx, i}
+			} else {
+				if hE[1] == -1 {
+					break
+				}
+
+				if vS[1] == -1 {
+					if p[i] == ' ' {
+						break
+					}
+
+					vS = [2]int{pIdx, i}
+				}
+			}
+		}
+
+		i++
+	}
+
+	return
+}
+
+// Header returns header value, if header not found, value will be blank
+func Header(payload, name []byte) []byte {
+	val, _, _, _, _ := header(payload, name)
+
+	return val
+}
+
+// SetHeader sets header value. If header not found it creates new one.
+// Returns modified request payload
 func SetHeader(payload, name, value []byte) []byte {
-    _, hs, vs, he := Header(payload, name)
+	_, hs, _, vs, ve := header(payload, name)
 
-    // If header found
-    if hs != -1 {
-        return byteutils.Replace(payload, vs, he, value)
-    } else {
-        return AddHeader(payload, name, value)
-    }
+	if hs != -1 {
+		// If header found we just replace its value
+		return byteutils.Replace(payload, vs, ve, value)
+	}
+
+	return AddHeader(payload, name, value)
 }
 
+// AddHeader takes http payload and appends new header to the start of headers section
+// Returns modified request payload
 func AddHeader(payload, name, value []byte) []byte {
-    header := make([]byte, len(name) + 2 + len(value) + 2)
-    copy(header[0:], name)
-    copy(header[len(name):], HEADER_DELIM)
-    copy(header[len(name)+2:], value)
-    copy(header[len(header)-2:], CLRF)
+	header := make([]byte, len(name)+2+len(value)+2)
+	copy(header[0:], name)
+	copy(header[len(name):], HeaderDelim)
+	copy(header[len(name)+2:], value)
+	copy(header[len(header)-2:], CLRF)
 
-    mimeStart := MIMEHeadersStartPos(payload)
+	mimeStart := MIMEHeadersStartPos(payload)
 
-    return byteutils.Insert(payload, mimeStart, header)
+	return byteutils.Insert(payload, mimeStart, header)
 }
 
+// DelHeader takes http payload and removes header name from headers section
+// Returns modified request payload
+func DeleteHeader(payload, name []byte) []byte {
+	_, hs, he, _, _ := header(payload, name)
+	if hs != -1 {
+		newHeader := make([]byte, len(payload)-(he-hs)-1)
+		copy(newHeader[:hs], payload[:hs])
+		copy(newHeader[hs:], payload[he+1:])
+		return newHeader
+	}
+	return payload
+}
+
+// Body returns request/response body
+func Body(payload []byte) []byte {
+	// 4 -> len(EMPTY_LINE)
+	return payload[MIMEHeadersEndPos(payload)+4:]
+}
+
+// Path takes payload and retuns request path: Split(firstLine, ' ')[1]
 func Path(payload []byte) []byte {
-    start := bytes.IndexByte(payload, ' ')
-    start += 1
+	start := bytes.IndexByte(payload, ' ') + 1
+	end := bytes.IndexByte(payload[start:], ' ')
 
-    end := bytes.IndexByte(payload[start:], ' ')
-
-    return payload[start:start+end]
+	return payload[start : start+end]
 }
 
+// SetPath takes payload, sets new path and returns modified payload
 func SetPath(payload, path []byte) []byte {
-    start := bytes.IndexByte(payload, ' ')
-    start += 1
+	start := bytes.IndexByte(payload, ' ') + 1
+	end := bytes.IndexByte(payload[start:], ' ')
 
-    end := bytes.IndexByte(payload[start:], ' ')
-
-    return byteutils.Replace(payload, start, start+end, path)
+	return byteutils.Replace(payload, start, start+end, path)
 }
 
+// PathParam returns URL query attribute by given name, if no found: valueStart will be -1
 func PathParam(payload, name []byte) (value []byte, valueStart, valueEnd int) {
-    path := Path(payload)
+	path := Path(payload)
 
-    if paramStart := bytes.Index(path, append(name, '=')); paramStart != -1 {
-        valueStart := paramStart + len(name) + 1
-        paramEnd := bytes.IndexByte(path[valueStart:], '&')
-        if paramEnd == -1 { // It is final param
-            paramEnd = len(path)
-        } else {
-            paramEnd += valueStart
-        }
+	if paramStart := bytes.Index(path, append(name, '=')); paramStart != -1 {
+		valueStart := paramStart + len(name) + 1
+		paramEnd := bytes.IndexByte(path[valueStart:], '&')
 
-        return path[valueStart:paramEnd], valueStart, paramEnd
-    } else {
-        return []byte(""), -1, -1
-    }
+		// Param can end with '&' (another param), or end of line
+		if paramEnd == -1 { // It is final param
+			paramEnd = len(path)
+		} else {
+			paramEnd += valueStart
+		}
+
+		return path[valueStart:paramEnd], valueStart, paramEnd
+	}
+
+	return []byte(""), -1, -1
 }
 
+// SetPathParam takes payload and updates path Query attribute
+// If query param not found, it will append new
+// Returns modified payload
 func SetPathParam(payload, name, value []byte) []byte {
-    path := Path(payload)
-    _, vs, ve := PathParam(payload, name)
+	path := Path(payload)
+	_, vs, ve := PathParam(payload, name)
 
-    if vs != -1 {
-        newPath := make([]byte, len(path))
-        copy(newPath, path)
-        newPath = byteutils.Replace(newPath, vs, ve, value)
+	if vs != -1 { // If param found, replace its value and set new Path
+		newPath := make([]byte, len(path))
+		copy(newPath, path)
+		newPath = byteutils.Replace(newPath, vs, ve, value)
 
-        return SetPath(payload, newPath)
-    } else { // if param not found append to end of url
-        // Adding 2 because of '?' or '&' at start, and '=' in middle
-        newParam := make([]byte, len(name) + len(value) + 2)
+		return SetPath(payload, newPath)
+	}
 
-        if bytes.IndexByte(path, '?') == -1 {
-            newParam[0] = '?'
-        } else {
-            newParam[0] = '&'
-        }
+	// if param not found append to end of url
+	// Adding 2 because of '?' or '&' at start, and '=' in middle
+	newParam := make([]byte, len(name)+len(value)+2)
 
-        copy(newParam[1:], name)
-        newParam[1+len(name)] = '='
-        copy(newParam[2+len(name):], value)
+	if bytes.IndexByte(path, '?') == -1 {
+		newParam[0] = '?'
+	} else {
+		newParam[0] = '&'
+	}
 
-        newPath := make([]byte, len(path) + len(newParam))
-        copy(newPath, path)
-        copy(newPath[len(path):], newParam)
+	// Copy "param=value" into buffer, after it looks like "?param=value"
+	copy(newParam[1:], name)
+	newParam[1+len(name)] = '='
+	copy(newParam[2+len(name):], value)
 
-        return SetPath(payload, newPath)
-    }
+	// Append param to the end of path
+	newPath := make([]byte, len(path)+len(newParam))
+	copy(newPath, path)
+	copy(newPath[len(path):], newParam)
+
+	return SetPath(payload, newPath)
 }
 
+// SetHost updates Host header for HTTP/1.1 or updates host in path for HTTP/1.0 or Proxy requests
+// Returns modified payload
 func SetHost(payload, url, host []byte) []byte {
-    // If this is HTTP 1.0 traffic or proxy traffic it may include host right into path variable, so instead of setting Host header we rewrite Path
-    // Fix for https://github.com/buger/gor/issues/156
-    if path := Path(payload); bytes.HasPrefix(path, []byte("http")) {
-        hostStart := bytes.IndexByte(path, ':') // : position "https?:"
-        hostStart += 3 // Skip 1 ':' and 2 '\'
-        hostEnd := hostStart + bytes.IndexByte(path[hostStart:], '/')
+	// If this is HTTP 1.0 traffic or proxy traffic it may include host right into path variable, so instead of setting Host header we rewrite Path
+	// Fix for https://github.com/buger/gor/issues/156
+	if path := Path(payload); bytes.HasPrefix(path, []byte("http")) {
+		hostStart := bytes.IndexByte(path, ':') // : position "https?:"
+		hostStart += 3                          // Skip 1 ':' and 2 '\'
+		hostEnd := hostStart + bytes.IndexByte(path[hostStart:], '/')
 
-        newPath := make([]byte, len(path))
-        copy(newPath, path)
-        newPath = byteutils.Replace(newPath, 0, hostEnd, url)
+		newPath := make([]byte, len(path))
+		copy(newPath, path)
+		newPath = byteutils.Replace(newPath, 0, hostEnd, url)
 
-        return SetPath(payload, newPath)
-    } else {
-        return SetHeader(payload, []byte("Host"), host)
-    }
+		return SetPath(payload, newPath)
+	}
+
+	return SetHeader(payload, []byte("Host"), host)
 }
 
+// Method returns HTTP method
 func Method(payload []byte) []byte {
-    end := bytes.IndexByte(payload, ' ')
+	end := bytes.IndexByte(payload, ' ')
 
-    return payload[:end]
+	return payload[:end]
 }
 
-// Status in response have same position as Path in request
+// Status returns response status.
+// It happend to be in same position as request payload path
 func Status(payload []byte) []byte {
-    return Path(payload)
-}
+	return Path(payload)
+}
+
+var httpMethods []string = []string{
+	"GET ", "OPTI", "HEAD", "POST", "PUT ", "DELE", "TRAC", "CONN", "PATC" /* custom methods */, "BAN", "PURG",
+}
+
+func IsHTTPPayload(payload []byte) bool {
+	if len(payload) < 4 {
+		return false
+	}
+
+	method := string(payload[0:4])
+
+	for _, m := range httpMethods {
+		if method == m {
+			return true
+		}
+	}
+	return false
+}

proto/proto_test.go

@@ -1,152 +1,295 @@
 package proto
 
 import (
-    "testing"
-    "bytes"
+	"bytes"
+	"reflect"
+	"testing"
 )
 
 func TestHeader(t *testing.T) {
-    var payload, val []byte
-    var headerStart int
+	var payload, val []byte
+	var headerStart int
 
-    payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	// Value with space at start
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    if val, _, _, _ = Header(payload, []byte("Content-Length")); !bytes.Equal(val, []byte("7")) {
-        t.Error("Should find header value")
-    }
+	if val = Header(payload, []byte("Content-Length")); !bytes.Equal(val, []byte("7")) {
+		t.Error("Should find header value")
+	}
 
-    payload = []byte("POST /post HTTP/1.1\r\nContent-Length:7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	// Value with space at end
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7 \r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    if val, _, _, _ = Header(payload, []byte("Content-Length")); !bytes.Equal(val, []byte("7")) {
-        t.Error("Should find header value without space after :")
-    }
+	if val = Header(payload, []byte("Content-Length")); !bytes.Equal(val, []byte("7")) {
+		t.Error("Should find header value without space after 7")
+	}
 
-    if _, headerStart, _, _ = Header(payload, []byte("Not-Found")); headerStart != -1  {
-        t.Error("Should not found header")
-    }
+	// Value without space at start
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length:7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if val = Header(payload, []byte("Content-Length")); !bytes.Equal(val, []byte("7")) {
+		t.Error("Should find header value without space after :")
+	}
+
+	// Value is empty
+	payload = []byte("GET /p HTTP/1.1\r\nCookie:\r\nHost: www.w3.org\r\n\r\n")
+
+	if val = Header(payload, []byte("Cookie")); len(val) > 0 {
+		t.Error("Should return empty value")
+	}
+
+	// Wrong delimeter
+	payload = []byte("GET /p HTTP/1.1\r\nCookie: 123\nHost: www.w3.org\r\n\r\n")
+
+	if val = Header(payload, []byte("Cookie")); !bytes.Equal(val, []byte("123")) {
+		t.Error("Should handle wrong header delimeter")
+	}
+
+	// Header not found
+	if _, headerStart, _, _, _ = header(payload, []byte("Not-Found")); headerStart != -1 {
+		t.Error("Should not found header")
+	}
+
+	// Lower case headers
+	payload = []byte("POST /post HTTP/1.1\r\ncontent-length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if val = Header(payload, []byte("Content-Length")); !bytes.Equal(val, []byte("7")) {
+		t.Error("Should find lower case 2 word header")
+	}
+
+	payload = []byte("POST /post HTTP/1.1\r\ncontent-length: 7\r\nhost: www.w3.org\r\n\r\na=1&b=2")
+
+	if val = Header(payload, []byte("host")); !bytes.Equal(val, []byte("www.w3.org")) {
+		t.Error("Should find lower case 1 word header")
+	}
 }
 
 func TestMIMEHeadersEndPos(t *testing.T) {
-    head := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org")
-    payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	head := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org")
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    end := MIMEHeadersEndPos(payload)
+	end := MIMEHeadersEndPos(payload)
 
-    if !bytes.Equal(payload[:end], head) {
-        t.Error("Wrong headers end position:", end)
-    }
+	if !bytes.Equal(payload[:end], head) {
+		t.Error("Wrong headers end position:", end)
+	}
 }
 
 func TestMIMEHeadersStartPos(t *testing.T) {
-    headers := []byte("Content-Length: 7\r\nHost: www.w3.org")
-    payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	headers := []byte("Content-Length: 7\r\nHost: www.w3.org")
+	payload := []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    start := MIMEHeadersStartPos(payload)
-    end := MIMEHeadersEndPos(payload)
+	start := MIMEHeadersStartPos(payload)
+	end := MIMEHeadersEndPos(payload)
 
-    if !bytes.Equal(payload[start:end], headers) {
-        t.Error("Wrong headers end position:", start, end)
-    }
+	if !bytes.Equal(payload[start:end], headers) {
+		t.Error("Wrong headers end position:", start, end)
+	}
 }
 
 func TestSetHeader(t *testing.T) {
-    var payload, payload_after []byte
+	var payload, payloadAfter []byte
 
-    payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
-    payload_after = []byte("POST /post HTTP/1.1\r\nContent-Length: 14\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	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\nContent-Length: 14\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    if payload = SetHeader(payload, []byte("Content-Length"), []byte("14")); !bytes.Equal(payload, payload_after) {
-        t.Error("Should update header if it exists", string(payload))
-    }
+	if payload = SetHeader(payload, []byte("Content-Length"), []byte("14")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should update header if it exists", string(payload))
+	}
 
+	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")
 
-    payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
-    payload_after = []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 = SetHeader(payload, []byte("User-Agent"), []byte("Gor")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should add header if not found", string(payload))
+	}
+}
 
-    if payload = SetHeader(payload, []byte("User-Agent"), []byte("Gor")); !bytes.Equal(payload, payload_after) {
-        t.Error("Should add header if not found", string(payload))
-    }
+func TestDeleteHeader(t *testing.T) {
+	var payload, payloadAfter []byte
+
+	payload = []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")
+	payloadAfter = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = DeleteHeader(payload, []byte("User-Agent")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should delete header if found", string(payload), string(payloadAfter))
+	}
+
+	//Whitespace at end of User-Agent
+	payload = []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")
+	payloadAfter = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+
+	if payload = DeleteHeader(payload, []byte("User-Agent")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should delete header if found", string(payload), string(payloadAfter))
+	}
+}
+
+func TestParseHeaders(t *testing.T) {
+	payload := [][]byte{[]byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.or"), []byte("g\r\nUser-Ag"), []byte("ent:Chrome\r\n\r\n"), []byte("Fake-Header: asda")}
+
+	headers := make(map[string]string)
+
+	ParseHeaders(payload, func(header []byte, value []byte) bool {
+		headers[string(header)] = string(value)
+		return true
+	})
+
+	expected := map[string]string{
+		"Content-Length": "7",
+		"Host":           "www.w3.org",
+		"User-Agent":     "Chrome",
+	}
+
+	if !reflect.DeepEqual(headers, expected) {
+		t.Error("Headers do not properly parsed", headers)
+	}
+}
+
+func TestParseHeadersWithComplexUserAgent(t *testing.T) {
+	// User-Agent could contain inside ':'
+	// Parser should wait for \r\n
+	payload := [][]byte{[]byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.or"), []byte("g\r\nUser-Ag"), []byte("ent:Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko\r\n\r\n"), []byte("Fake-Header: asda")}
+
+	headers := make(map[string]string)
+
+	ParseHeaders(payload, func(header []byte, value []byte) bool {
+		headers[string(header)] = string(value)
+		return true
+	})
+
+	expected := map[string]string{
+		"User-Agent": "Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko",
+	}
+
+	if expected["User-Agent"] != headers["User-Agent"] {
+		t.Errorf("Header 'User-Agent' expected '%s' and parsed: '%s'", expected["User-Agent"], headers["User-Agent"])
+	}
+}
+
+func TestParseHeadersWithOrigin(t *testing.T) {
+	// User-Agent could contain inside ':'
+	// Parser should wait for \r\n
+	payload := [][]byte{[]byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.or"), []byte("g\r\nReferrer: http://127.0.0.1:3000\r\nOrigi"), []byte("n: https://www.example.com\r\nUser-Ag"), []byte("ent:Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko\r\n\r\n"), []byte("in:https://www.example.com\r\n\r\n"), []byte("Fake-Header: asda")}
+
+	headers := make(map[string]string)
+
+	ParseHeaders(payload, func(header []byte, value []byte) bool {
+		headers[string(header)] = string(value)
+		return true
+	})
+
+	expected := map[string]string{
+		"Origin":     "https://www.example.com",
+		"User-Agent": "Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko",
+		"Referrer":   "http://127.0.0.1:3000",
+	}
+
+	if expected["Referrer"] != headers["Referrer"] {
+		t.Errorf("Header 'Referrer' expected '%s' and parsed: '%s'", expected["Referrer"], headers["Referrer"])
+	}
+
+	if expected["Origin"] != headers["Origin"] {
+		t.Errorf("Header 'Origin' expected '%s' and parsed: '%s'", expected["Origin"], headers["Origin"])
+	}
+
+	if expected["User-Agent"] != headers["User-Agent"] {
+		t.Errorf("Header 'User-Agent' expected '%s' and parsed: '%s'", expected["User-Agent"], headers["User-Agent"])
+	}
+}
+
+func TestHeaderEquals(t *testing.T) {
+	tests := []struct {
+		h1     string
+		h2     string
+		equals bool
+	}{
+		{"Content-Length", "content-length", true},
+		{"content-length", "Content-Length", true},
+		{"content-Pength", "Content-Length", false},
+		{"Host", "Content-Length", false},
+	}
+
+	for _, tc := range tests {
+		if HeadersEqual([]byte(tc.h1), []byte(tc.h2)) != tc.equals {
+			t.Error(tc)
+		}
+	}
 }
 
 func TestPath(t *testing.T) {
-    var path, payload []byte
+	var path, payload []byte
 
-    payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    if path = Path(payload); !bytes.Equal(path, []byte("/post")) {
-        t.Error("Should find path", string(path))
-    }
+	if path = Path(payload); !bytes.Equal(path, []byte("/post")) {
+		t.Error("Should find path", string(path))
+	}
 }
 
 func TestSetPath(t *testing.T) {
-    var payload, payload_after []byte
+	var payload, payloadAfter []byte
 
-    payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
-    payload_after = []byte("POST /new_path HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	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 /new_path HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    if payload = SetPath(payload, []byte("/new_path")); !bytes.Equal(payload, payload_after) {
-        t.Error("Should replace path", string(payload))
-    }
+	if payload = SetPath(payload, []byte("/new_path")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should replace path", string(payload))
+	}
 }
 
 func TestPathParam(t *testing.T) {
-    var payload []byte
+	var payload []byte
 
-    payload = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payload = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    if val, _, _ := PathParam(payload, []byte("param")); !bytes.Equal(val, []byte("test")) {
-        t.Error("Should detect attribute", string(val))
-    }
+	if val, _, _ := PathParam(payload, []byte("param")); !bytes.Equal(val, []byte("test")) {
+		t.Error("Should detect attribute", string(val))
+	}
 
-    if val, _, _ := PathParam(payload, []byte("user_id")); !bytes.Equal(val, []byte("1")) {
-        t.Error("Should detect attribute", string(val))
-    }
+	if val, _, _ := PathParam(payload, []byte("user_id")); !bytes.Equal(val, []byte("1")) {
+		t.Error("Should detect attribute", string(val))
+	}
 }
 
-
 func TestSetPathParam(t *testing.T) {
-    var payload, payload_after []byte
+	var payload, payloadAfter []byte
 
-    payload = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
-    payload_after = []byte("POST /post?param=new&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payload = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /post?param=new&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    if payload = SetPathParam(payload, []byte("param"), []byte("new")); !bytes.Equal(payload, payload_after) {
-        t.Error("Should replace existing value", string(payload))
-    }
+	if payload = SetPathParam(payload, []byte("param"), []byte("new")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should replace existing value", string(payload))
+	}
 
-    payload = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
-    payload_after = []byte("POST /post?param=test&user_id=2 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payload = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /post?param=test&user_id=2 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    if payload = SetPathParam(payload, []byte("user_id"), []byte("2")); !bytes.Equal(payload, payload_after) {
-        t.Error("Should replace existing value", string(payload))
-    }
+	if payload = SetPathParam(payload, []byte("user_id"), []byte("2")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should replace existing value", string(payload))
+	}
 
+	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?param=test HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    payload = []byte("POST /post HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
-    payload_after = []byte("POST /post?param=test HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	if payload = SetPathParam(payload, []byte("param"), []byte("test")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should set param if url have no params", string(payload))
+	}
 
-    if payload = SetPathParam(payload, []byte("param"), []byte("test")); !bytes.Equal(payload, payload_after) {
-        t.Error("Should set param if url have no params", string(payload))
-    }
+	payload = []byte("POST /post?param=test HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-
-    payload = []byte("POST /post?param=test HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
-    payload_after = []byte("POST /post?param=test&user_id=1 HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
-
-    if payload = SetPathParam(payload, []byte("user_id"), []byte("1")); !bytes.Equal(payload, payload_after) {
-        t.Error("Should set param at the end if url params", string(payload))
-    }
+	if payload = SetPathParam(payload, []byte("user_id"), []byte("1")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should set param at the end if url params", string(payload))
+	}
 }
 
-
-
 func TestSetHostHTTP10(t *testing.T) {
-    var payload, payload_after []byte
+	var payload, payloadAfter []byte
 
-    payload = []byte("POST http://example.com/post HTTP/1.0\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
-    payload_after = []byte("POST http://new.com/post HTTP/1.0\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payload = []byte("POST http://example.com/post HTTP/1.0\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
+	payloadAfter = []byte("POST http://new.com/post HTTP/1.0\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 
-    if payload = SetHost(payload, []byte("http://new.com"), []byte("new.com")); !bytes.Equal(payload, payload_after) {
-        t.Error("Should replace host", string(payload))
-    }
-}
+	if payload = SetHost(payload, []byte("http://new.com"), []byte("new.com")); !bytes.Equal(payload, payloadAfter) {
+		t.Error("Should replace host", string(payload))
+	}
+}

protocol.go

@@ -0,0 +1,103 @@
+package main
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/hex"
+	"strconv"
+)
+
+const (
+	RequestPayload          = '1'
+	ResponsePayload         = '2'
+	ReplayedResponsePayload = '3'
+)
+
+func uuid() []byte {
+	b := make([]byte, 20)
+	rand.Read(b)
+
+	uuid := make([]byte, 40)
+	hex.Encode(uuid, b)
+
+	return uuid
+}
+
+var payloadSeparator = "\n🐵🙈🙉\n"
+
+func payloadScanner(data []byte, atEOF bool) (advance int, token []byte, err error) {
+	if atEOF && len(data) == 0 {
+		return 0, nil, nil
+	}
+
+	if i := bytes.Index(data, []byte(payloadSeparator)); i >= 0 {
+		// We have a full newline-terminated line.
+		return i + len([]byte(payloadSeparator)), data[0:i], nil
+	}
+
+	if atEOF {
+		return len(data), data, nil
+	}
+	return 0, nil, nil
+}
+
+// Timing is request start or round-trip time, depending on payloadType
+func payloadHeader(payloadType byte, uuid []byte, timing int64, latency int64) (header []byte) {
+	var sTime, sLatency string
+
+	sTime = strconv.FormatInt(timing, 10)
+	if latency != -1 {
+		sLatency = strconv.FormatInt(latency, 10)
+	}
+
+	//Example:
+	//  3 f45590522cd1838b4a0d5c5aab80b77929dea3b3 1231\n
+	// `+ 1` indicates space characters or end of line
+	headerLen := 1 + 1 + len(uuid) + 1 + len(sTime) + 1
+
+	if latency != -1 {
+		headerLen += len(sLatency) + 1
+	}
+
+	header = make([]byte, headerLen)
+	header[0] = payloadType
+	header[1] = ' '
+	header[2+len(uuid)] = ' '
+	header[len(header)-1] = '\n'
+
+	copy(header[2:], uuid)
+	copy(header[3+len(uuid):], sTime)
+
+	if latency != -1 {
+		header[3+len(uuid)+len(sTime)] = ' '
+		copy(header[4+len(uuid)+len(sTime):], sLatency)
+	}
+
+	return header
+}
+
+func payloadBody(payload []byte) []byte {
+	headerSize := bytes.IndexByte(payload, '\n')
+	return payload[headerSize+1:]
+}
+
+func payloadMeta(payload []byte) [][]byte {
+	headerSize := bytes.IndexByte(payload, '\n')
+	if headerSize < 0 {
+		headerSize = 0
+	}
+	return bytes.Split(payload[:headerSize], []byte{' '})
+}
+
+func isOriginPayload(payload []byte) bool {
+	switch payload[0] {
+	case RequestPayload, ResponsePayload:
+		return true
+	default:
+		return false
+	}
+}
+
+func isRequestPayload(payload []byte) bool {
+	return payload[0] == RequestPayload
+}

raw_socket_listener/listener.go

@@ -1,175 +1,842 @@
-package raw_socket
+/*
+Package rawSocket provides traffic sniffier using RAW sockets.
+
+Capture traffic from socket using RAW_SOCKET's
+http://en.wikipedia.org/wiki/Raw_socket
+
+RAW_SOCKET allow you listen for traffic on any port (e.g. sniffing) because they operate on IP level.
+
+Ports is TCP feature, same as flow control, reliable transmission and etc.
+
+This package implements own TCP layer: TCP packets is parsed using tcp_packet.go, and flow control is managed by tcp_message.go
+*/
+package rawSocket
 
 import (
-    "encoding/binary"
-    "log"
-    "net"
-    "strconv"
-    "bytes"
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"github.com/buger/gor/proto"
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+	"github.com/google/gopacket/pcap"
+	"io"
+	"log"
+	"net"
+	"runtime"
+	"runtime/debug"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
 )
 
-// Capture traffic from socket using RAW_SOCKET's
-// http://en.wikipedia.org/wiki/Raw_socket
-//
-// RAW_SOCKET allow you listen for traffic on any port (e.g. sniffing) because they operate on IP level.
-// Ports is TCP feature, same as flow control, reliable transmission and etc.
-// Since we can't use default TCP libraries RAWTCPLitener implements own TCP layer
-// TCP packets is parsed using tcp_packet.go, and flow control is managed by tcp_message.go
-type Listener struct {
-    messages map[string]*TCPMessage // buffer of TCPMessages waiting to be send
+var _ = fmt.Println
 
-    // Expect: 100-continue request is send in 2 tcp messages
-    // We store ACK aliases to merge this packets together
-    ack_aliases map[uint32]uint32
-    seq_with_data map[uint32]uint32
-
-    c_packets  chan *TCPPacket
-    c_messages chan *TCPMessage // Messages ready to be send to client
-
-    c_del_message chan *TCPMessage // Used for notifications about completed or expired messages
-
-    addr string // IP to listen
-    port int    // Port to listen
+type packet struct {
+	srcIP		[]byte
+	data		[]byte
+	timestamp	time.Time
 }
 
-// RAWTCPListen creates a listener to capture traffic from RAW_SOCKET
-func NewListener(addr string, port string) (rawListener *Listener) {
-    rawListener = &Listener{}
+// Listener handle traffic capture
+type Listener struct {
+	mu sync.Mutex
+	// buffer of TCPMessages waiting to be send
+	// ID -> TCPMessage
+	messages map[tcpID]*TCPMessage
 
-    rawListener.c_packets = make(chan *TCPPacket, 10000)
-    rawListener.c_messages = make(chan *TCPMessage, 10000)
-    rawListener.c_del_message = make(chan *TCPMessage, 10000)
+	// Expect: 100-continue request is send in 2 tcp messages
+	// We store ACK aliases to merge this packets together
+	ackAliases map[uint32]uint32
+	// To get ACK of second message we need to compute its Seq and wait for them message
+	seqWithData map[uint32]uint32
 
-    rawListener.messages = make(map[string]*TCPMessage)
-    rawListener.ack_aliases = make(map[uint32]uint32)
-    rawListener.seq_with_data = make(map[uint32]uint32)
+	// Ack -> Req
+	respAliases map[uint32]*TCPMessage
 
-    rawListener.addr = addr
-    rawListener.port, _ = strconv.Atoi(port)
+	// Ack -> ID
+	respWithoutReq map[uint32]tcpID
 
-    go rawListener.listen()
-    go rawListener.readRAWSocket()
+	// Messages ready to be send to client
+	packetsChan chan *packet
 
-    return
+	// Messages ready to be send to client
+	messagesChan chan *TCPMessage
+
+	addr string // IP to listen
+	port uint16 // Port to listen
+
+	trackResponse bool
+	messageExpire time.Duration
+
+	conn        net.PacketConn
+	pcapHandles []*pcap.Handle
+
+	quit    chan bool
+	readyCh chan bool
+}
+
+type request struct {
+	id    tcpID
+	start time.Time
+	ack   uint32
+}
+
+// Available engines for intercepting traffic
+const (
+	EngineRawSocket = 1 << iota
+	EnginePcap
+	EnginePcapFile
+)
+
+// NewListener creates and initializes new Listener object
+func NewListener(addr string, port string, engine int, trackResponse bool, expire time.Duration) (l *Listener) {
+	l = &Listener{}
+
+	l.packetsChan = make(chan *packet, 10000)
+	l.messagesChan = make(chan *TCPMessage, 10000)
+	l.quit = make(chan bool)
+	l.readyCh = make(chan bool, 1)
+
+	l.messages = make(map[tcpID]*TCPMessage)
+	l.ackAliases = make(map[uint32]uint32)
+	l.seqWithData = make(map[uint32]uint32)
+	l.respAliases = make(map[uint32]*TCPMessage)
+	l.respWithoutReq = make(map[uint32]tcpID)
+	l.trackResponse = trackResponse
+
+	l.addr = addr
+	_port, _ := strconv.Atoi(port)
+	l.port = uint16(_port)
+
+	if expire.Nanoseconds() == 0 {
+		expire = 2000 * time.Millisecond
+	}
+
+	l.messageExpire = expire
+
+	go l.listen()
+
+	// Special case for testing
+	if l.port != 0 {
+		switch engine {
+		case EnginePcap:
+			go l.readPcap()
+		case EnginePcapFile:
+			go l.readPcapFile()
+		default:
+			log.Fatal("Unknown traffic interception engine:", engine)
+		}
+	}
+
+	return
 }
 
 func (t *Listener) listen() {
-    for {
-        select {
-        // If message ready for deletion it means that its also complete or expired by timeout
-        case message := <-t.c_del_message:
-            t.c_messages <- message
-            delete(t.ack_aliases, message.packets[0].Ack)
-            delete(t.messages, message.ID)
+	gcTicker := time.Tick(t.messageExpire / 2)
 
-        // We need to use channels to process each packet to avoid data races
-        case packet := <-t.c_packets:
-            t.processTCPPacket(packet)
-        }
-    }
+	for {
+		select {
+		case <-t.quit:
+			if t.conn != nil {
+				t.conn.Close()
+			}
+			return
+		case packet := <-t.packetsChan:
+			tcpPacket := ParseTCPPacket(packet.srcIP, packet.data, packet.timestamp)
+			t.processTCPPacket(tcpPacket)
+		case <-gcTicker:
+			now := time.Now()
+
+			// Dispatch requests before responses
+			for _, message := range t.messages {
+				if now.Sub(message.End) >= t.messageExpire {
+					t.dispatchMessage(message)
+				}
+			}
+		}
+	}
+}
+
+func (t *Listener) deleteMessage(message *TCPMessage) {
+	delete(t.messages, message.ID())
+	delete(t.ackAliases, message.Ack)
+	if message.DataAck != 0 {
+		delete(t.ackAliases, message.DataAck)
+	}
+	if message.DataSeq != 0 {
+		delete(t.seqWithData, message.DataSeq)
+	}
+
+	delete(t.respAliases, message.ResponseAck)
+}
+
+func (t *Listener) dispatchMessage(message *TCPMessage) {
+	// If already dispatched
+	if _, ok := t.messages[message.ID()]; !ok {
+		return
+	}
+
+	t.deleteMessage(message)
+
+	if !message.complete {
+		if !message.IsIncoming {
+			delete(t.respAliases, message.Ack)
+			delete(t.respWithoutReq, message.Ack)
+		}
+
+		return
+	}
+
+	if message.IsIncoming {
+		// If there were response before request
+		// log.Println("Looking for Response: ", t.respWithoutReq, message.ResponseAck)
+		if t.trackResponse {
+			if respID, ok := t.respWithoutReq[message.ResponseAck]; ok {
+				if resp, rok := t.messages[respID]; rok {
+					// if resp.AssocMessage == nil {
+					// log.Println("FOUND RESPONSE")
+					resp.setAssocMessage(message)
+					message.setAssocMessage(resp)
+
+					if resp.complete {
+						defer t.dispatchMessage(resp)
+					}
+					// }
+				}
+			}
+
+			if resp, ok := t.messages[message.ResponseID]; ok {
+				resp.setAssocMessage(message)
+			}
+		}
+	} else {
+		if message.AssocMessage == nil {
+			if responseRequest, ok := t.respAliases[message.Ack]; ok {
+				message.setAssocMessage(responseRequest)
+				responseRequest.setAssocMessage(message)
+			}
+		}
+
+		delete(t.respAliases, message.Ack)
+		delete(t.respWithoutReq, message.Ack)
+
+		// Do not track responses which have no associated requests
+		if message.AssocMessage == nil {
+			// log.Println("Can't dispatch resp", message.Seq, message.Ack, string(message.Bytes()))
+			return
+		}
+	}
+
+	t.messagesChan <- message
+}
+
+// DeviceNotFoundError raised if user specified wrong ip
+type DeviceNotFoundError struct {
+	addr string
+}
+
+func (e *DeviceNotFoundError) Error() string {
+	devices, _ := pcap.FindAllDevs()
+
+	if len(devices) == 0 {
+		return "Can't get list of network interfaces, ensure that you running Gor as root user or sudo.\nTo run as non-root users see this docs https://github.com/buger/gor/wiki/Running-as-non-root-user"
+	}
+
+	var msg string
+	msg += "Can't find interfaces with addr: " + e.addr + ". Provide available IP for intercepting traffic: \n"
+	for _, device := range devices {
+		msg += "Name: " + device.Name + "\n"
+		if device.Description != "" {
+			msg += "Description: " + device.Description + "\n"
+		}
+		for _, address := range device.Addresses {
+			msg += "- IP address: " + address.IP.String() + "\n"
+		}
+	}
+
+	return msg
+}
+
+func isLoopback(device pcap.Interface) bool {
+	if len(device.Addresses) == 0 {
+		return false
+	}
+
+	switch device.Addresses[0].IP.String() {
+	case "127.0.0.1", "::1":
+		return true
+	}
+
+	return false
+}
+
+func listenAllInterfaces(addr string) bool {
+	switch addr {
+	case "", "0.0.0.0", "[::]", "::":
+		return true
+	default:
+		return false
+	}
+}
+
+func findPcapDevices(addr string) (interfaces []pcap.Interface, err error) {
+	devices, err := pcap.FindAllDevs()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	for _, device := range devices {
+		if listenAllInterfaces(addr) && len(device.Addresses) > 0 || isLoopback(device) {
+			interfaces = append(interfaces, device)
+			continue
+		}
+
+		for _, address := range device.Addresses {
+			if device.Name == addr || address.IP.String() == addr {
+				interfaces = append(interfaces, device)
+				return interfaces, nil
+			}
+		}
+	}
+
+	if len(interfaces) == 0 {
+		return nil, &DeviceNotFoundError{addr}
+	} else {
+		return interfaces, nil
+	}
+}
+
+func (t *Listener) readPcap() {
+	devices, err := findPcapDevices(t.addr)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	bpfSupported := true
+	if runtime.GOOS == "darwin" {
+		bpfSupported = false
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(len(devices))
+
+	for _, d := range devices {
+		go func(device pcap.Interface) {
+			handle, err := pcap.OpenLive(device.Name, 65536, true, t.messageExpire)
+			if err != nil {
+				log.Println("Pcap Error while opening device", device.Name, err)
+				wg.Done()
+				return
+			}
+			defer handle.Close()
+
+			t.mu.Lock()
+			t.pcapHandles = append(t.pcapHandles, handle)
+
+			var bpfDstHost, bpfSrcHost string
+			var loopback = isLoopback(device)
+
+			if loopback {
+				var allAddr []string
+				for _, dc := range devices {
+					for _, addr := range dc.Addresses {
+						allAddr = append(allAddr, "(dst host "+addr.IP.String()+" and src host "+addr.IP.String()+")")
+					}
+				}
+
+				bpfDstHost = strings.Join(allAddr, " or ")
+				bpfSrcHost = bpfDstHost
+			} else {
+				for i, addr := range device.Addresses {
+					bpfDstHost += "dst host " + addr.IP.String()
+					bpfSrcHost += "src host " + addr.IP.String()
+					if i != len(device.Addresses)-1 {
+						bpfDstHost += " or "
+						bpfSrcHost += " or "
+					}
+				}
+			}
+
+			if bpfSupported {
+				var bpf string
+
+				if t.trackResponse {
+					bpf = "(tcp dst port " + strconv.Itoa(int(t.port)) + " and (" + bpfDstHost + ")) or (" + "tcp src port " + strconv.Itoa(int(t.port)) + " and (" + bpfSrcHost + "))"
+				} else {
+					bpf = "tcp dst port " + strconv.Itoa(int(t.port)) + " and (" + bpfDstHost + ")"
+				}
+
+				if err := handle.SetBPFFilter(bpf); err != nil {
+					log.Println("BPF filter error:", err, "Device:", device.Name, bpf)
+					wg.Done()
+					return
+				}
+			}
+			t.mu.Unlock()
+
+			var decoder gopacket.Decoder
+
+			// Special case for tunnel interface https://github.com/google/gopacket/issues/99
+			if handle.LinkType() == 12 {
+				decoder = layers.LayerTypeIPv4
+			} else {
+				decoder = handle.LinkType()
+			}
+
+			source := gopacket.NewPacketSource(handle, decoder)
+			source.Lazy = true
+			source.NoCopy = true
+
+			wg.Done()
+
+			var data, srcIP, dstIP []byte
+
+			for {
+				packet, err := source.NextPacket()
+
+				if err == io.EOF {
+					break
+				} else if err != nil {
+					continue
+				}
+
+				// We should remove network layer before parsing TCP/IP data
+				var of int
+				switch decoder {
+				case layers.LinkTypeEthernet:
+					of = 14
+				case layers.LinkTypePPP:
+					of = 1
+				case layers.LinkTypeFDDI:
+					of = 13
+				case layers.LinkTypeNull:
+					of = 4
+				case layers.LinkTypeLoop:
+					of = 4
+				case layers.LinkTypeRaw:
+					of = 0
+				case layers.LinkTypeLinuxSLL:
+					of = 16
+				default:
+					log.Println("Unknown packet layer", packet)
+					break
+				}
+
+				data = packet.Data()[of:]
+
+				version := uint8(data[0]) >> 4
+				ipLength := int(binary.BigEndian.Uint16(data[2:4]))
+
+				if version == 4 {
+					ihl := uint8(data[0]) & 0x0F
+
+					// Truncated IP info
+					if len(data) < int(ihl*4) {
+						continue
+					}
+
+					srcIP = data[12:16]
+					dstIP = data[16:20]
+
+					// Too small IP packet
+					if ipLength < 20 {
+						continue
+					}
+
+					// Invalid length
+					if int(ihl*4) > ipLength {
+						continue
+					}
+
+					if cmp := len(data) - ipLength; cmp > 0 {
+						data = data[:ipLength]
+					} else if cmp < 0 {
+						// Truncated packet
+						continue
+					}
+
+					data = data[ihl*4:]
+				} else {
+					// Truncated IP info
+					if len(data) < 40 {
+						continue
+					}
+
+					srcIP = data[8:24]
+					dstIP = data[24:40]
+
+					data = data[40:]
+				}
+
+				// Truncated TCP info
+				if len(data) <= 13 {
+					continue
+				}
+
+				dataOffset := (data[12] & 0xF0) >> 4
+				isFIN := data[13]&0x01 != 0
+
+				// We need only packets with data inside
+				// Check that the buffer is larger than the size of the TCP header
+				if len(data) > int(dataOffset*4) || isFIN {
+					if !bpfSupported {
+						destPort := binary.BigEndian.Uint16(data[2:4])
+						srcPort := binary.BigEndian.Uint16(data[0:2])
+
+						var addrCheck []byte
+
+						if destPort == t.port {
+							addrCheck = dstIP
+						}
+
+						if t.trackResponse && srcPort == t.port {
+							addrCheck = srcIP
+						}
+
+						if len(addrCheck) == 0 {
+							continue
+						}
+
+						addrMatched := false
+
+						if loopback {
+							for _, dc := range devices {
+								if addrMatched {
+									break
+								}
+								for _, a := range dc.Addresses {
+									if a.IP.Equal(net.IP(addrCheck)) {
+										addrMatched = true
+										break
+									}
+								}
+							}
+							addrMatched = true
+						} else {
+							for _, a := range device.Addresses {
+								if a.IP.Equal(net.IP(addrCheck)) {
+									addrMatched = true
+									break
+								}
+							}
+						}
+
+						if !addrMatched {
+							continue
+						}
+					}
+
+					t.packetsChan <- t.buildPacket(srcIP, data, packet.Metadata().Timestamp)
+				}
+			}
+		}(d)
+	}
+
+	wg.Wait()
+	t.readyCh <- true
+}
+
+func (t *Listener) readPcapFile() {
+	if handle, err := pcap.OpenOffline(t.addr); err != nil {
+		log.Fatal(err)
+	} else {
+		t.readyCh <- true
+		packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
+
+		for {
+			packet, err := packetSource.NextPacket()
+			if err == io.EOF {
+				break
+			} else if err != nil {
+				log.Println("Error:", err)
+				continue
+			}
+
+			var addr, data []byte
+
+			if tcpLayer := packet.Layer(layers.LayerTypeTCP); tcpLayer != nil {
+				tcp, _ := tcpLayer.(*layers.TCP)
+				data = append(tcp.LayerContents(), tcp.LayerPayload()...)
+
+				if tcp.SrcPort >= 32768 && tcp.SrcPort <= 61000 {
+					copy(data[0:2], []byte{0, 0})
+					copy(data[2:4], []byte{0, 1})
+				} else {
+					copy(data[0:2], []byte{0, 1})
+					copy(data[2:4], []byte{0, 0})
+				}
+			} else {
+				continue
+			}
+
+			if ipLayer := packet.Layer(layers.LayerTypeIPv4); ipLayer != nil {
+				ip, _ := ipLayer.(*layers.IPv4)
+				addr = ip.SrcIP
+			} else if ipLayer = packet.Layer(layers.LayerTypeIPv6); ipLayer != nil {
+				ip, _ := ipLayer.(*layers.IPv6)
+				addr = ip.SrcIP
+			} else {
+				// log.Println("Can't find IP layer", packet)
+				continue
+			}
+
+			dataOffset := (data[12] & 0xF0) >> 4
+			isFIN := data[13]&0x01 != 0
+
+			// We need only packets with data inside
+			// Check that the buffer is larger than the size of the TCP header
+			if len(data) <= int(dataOffset*4) && !isFIN {
+				continue
+			}
+
+			t.packetsChan <- t.buildPacket(addr, data, packet.Metadata().Timestamp)
+		}
+	}
 }
 
 func (t *Listener) readRAWSocket() {
-    conn, e := net.ListenPacket("ip4:tcp", t.addr)
+	conn, e := net.ListenPacket("ip:tcp", t.addr)
+	t.conn = conn
 
-    if e != nil {
-        log.Fatal(e)
-    }
+	if e != nil {
+		log.Fatal(e)
+	}
 
-    defer conn.Close()
+	defer t.conn.Close()
 
-    buf := make([]byte, 4096*10)
+	buf := make([]byte, 64*1024) // 64kb
 
-    for {
-        // Note: ReadFrom receive messages without IP header
-        n, addr, err := conn.ReadFrom(buf)
+	t.readyCh <- true
 
-        if err != nil {
-            log.Println("Error:", err)
-            continue
-        }
+	for {
+		// Note: ReadFrom receive messages without IP header
+		n, addr, err := t.conn.ReadFrom(buf)
 
-        if n > 0 {
-            t.parsePacket(addr, buf[:n])
-        }
-    }
+		if err != nil {
+			if strings.HasSuffix(err.Error(), "closed network connection") {
+				return
+			} else {
+				continue
+			}
+		}
+
+		if n > 0 {
+			if t.isValidPacket(buf[:n]) {
+				t.packetsChan <- t.buildPacket([]byte(addr.(*net.IPAddr).IP), buf[:n], time.Now())
+			}
+		}
+	}
 }
 
-func (t *Listener) parsePacket(addr net.Addr, buf []byte) {
-    if t.isIncomingDataPacket(buf) {
-        new_buf := make([]byte, len(buf))
-        copy(new_buf, buf)
+func (t *Listener) buildPacket(packetSrcIP []byte, packetData []byte, timestamp time.Time) *packet {
+	copyPacketSrcIP := make([]byte, 16)
+	copyPacketData := make([]byte, len(packetData))
 
-        t.c_packets <- ParseTCPPacket(addr, new_buf)
-    }
+	copy(copyPacketSrcIP, packetSrcIP)
+	copy(copyPacketData, packetSrcIP)
+
+	return &packet{
+		srcIP: packetSrcIP,
+		data: packetData,
+		timestamp:timestamp,
+	}
 }
 
-func (t *Listener) isIncomingDataPacket(buf []byte) bool {
-    // To avoid full packet parsing every time, we manually parsing values needed for packet filtering
-    // http://en.wikipedia.org/wiki/Transmission_Control_Protocol
-    dest_port := binary.BigEndian.Uint16(buf[2:4])
+func (t *Listener) isValidPacket(buf []byte) bool {
+	// To avoid full packet parsing every time, we manually parsing values needed for packet filtering
+	// http://en.wikipedia.org/wiki/Transmission_Control_Protocol
+	destPort := binary.BigEndian.Uint16(buf[2:4])
+	srcPort := binary.BigEndian.Uint16(buf[0:2])
 
-    // Because RAW_SOCKET can't be bound to port, we have to control it by ourself
-    if int(dest_port) == t.port {
-        // Get the 'data offset' (size of the TCP header in 32-bit words)
-        dataOffset := (buf[12] & 0xF0) >> 4
+	// Because RAW_SOCKET can't be bound to port, we have to control it by ourself
+	if destPort == t.port || (t.trackResponse && srcPort == t.port) {
+		// Get the 'data offset' (size of the TCP header in 32-bit words)
+		dataOffset := (buf[12] & 0xF0) >> 4
 
-        // We need only packets with data inside
-        // Check that the buffer is larger than the size of the TCP header
-        if len(buf) > int(dataOffset*4) {
-            // We should create new buffer because go slices is pointers. So buffer data shoud be immutable.
-            return true
-        }
-    }
+		// We need only packets with data inside
+		// Check that the buffer is larger than the size of the TCP header
+		if len(buf) > int(dataOffset*4) {
+			// We should create new buffer because go slices is pointers. So buffer data shoud be immutable.
+			return true
+		}
+	}
 
-    return false
+	return false
 }
 
-var bExpect100ContinueCheck = []byte("Expect: 100-continue")
-var bPOST = []byte("POST")
-
 // Trying to add packet to existing message or creating new message
 //
 // For TCP message unique id is Acknowledgment number (see tcp_packet.go)
 func (t *Listener) processTCPPacket(packet *TCPPacket) {
-    defer func() { recover() }()
+	// Don't exit on panic
+	defer func() {
+		if r := recover(); r != nil {
+			log.Println("PANIC: pkg:", r, packet, string(debug.Stack()))
+		}
+	}()
 
-    var message *TCPMessage
+	var message *TCPMessage
 
-    parent_message_ack, parent_ok := t.seq_with_data[packet.Seq]
-    if parent_ok {
-        t.ack_aliases[packet.Ack] = parent_message_ack
-        delete(t.seq_with_data, packet.Seq)
-    }
+	isIncoming := packet.DestPort == t.port
 
-    ack_alias, alias_ok := t.ack_aliases[packet.Ack]
-    if alias_ok {
-        packet.Ack = ack_alias
-    }
+	// Seek for 100-expect chunks
+	if parentAck, ok := t.seqWithData[packet.Seq]; ok {
+		// In case if non-first data chunks comes first
+		for _, m := range t.messages {
+			if m.Ack == packet.Ack && bytes.Equal(m.packets[0].Addr, packet.Addr) {
+				t.deleteMessage(m)
 
-    m_id := packet.Addr.String() + strconv.Itoa(int(packet.Ack))
-    message, ok := t.messages[m_id]
+				if m.AssocMessage != nil {
+					m.setAssocMessage(nil)
+				}
 
-    if !ok {
-        // We sending c_del_message channel, so message object can communicate with Listener and notify it if message completed
-        message = NewTCPMessage(m_id, t.c_del_message)
-        t.messages[m_id] = message
-    }
+				for _, pkt := range m.packets {
+					// log.Println("Updating ack", parentAck, pkt.Ack)
+					pkt.UpdateAck(parentAck)
+					// Re-queue this packets
+					t.processTCPPacket(pkt)
+				}
+			}
+		}
 
-    if bytes.Equal(packet.Data[0:4], bPOST) {
-        if bytes.Equal(packet.Data[len(packet.Data)-24:len(packet.Data)-4], bExpect100ContinueCheck) {
-            t.seq_with_data[packet.Seq + uint32(len(packet.Data))] = packet.Ack
+		t.ackAliases[packet.Ack] = parentAck
+		packet.UpdateAck(parentAck)
+	}
 
-            // Removing `Expect: 100-continue` header
-            packet.Data = append(packet.Data[:len(packet.Data)-24], packet.Data[len(packet.Data)-2:]...)
-        }
-    }
+	if isIncoming && packet.IsFIN {
+		if ma, ok := t.respAliases[packet.Seq]; ok {
+			if ma.packets[0].SrcPort == packet.SrcPort {
+				packet.UpdateAck(ma.Ack)
+			}
+		}
+	}
 
-    // Adding packet to message
-    message.c_packets <- packet
+	if alias, ok := t.ackAliases[packet.Ack]; ok {
+		packet.UpdateAck(alias)
+	}
+
+	var responseRequest *TCPMessage
+
+	if !isIncoming {
+		responseRequest, _ = t.respAliases[packet.Ack]
+	}
+
+	message, ok := t.messages[packet.ID]
+
+	if !ok {
+		message = NewTCPMessage(packet.Seq, packet.Ack, isIncoming, packet.timestamp)
+		t.messages[packet.ID] = message
+
+		if !isIncoming {
+			if responseRequest != nil {
+				message.setAssocMessage(responseRequest)
+				responseRequest.setAssocMessage(message)
+			} else {
+				t.respWithoutReq[packet.Ack] = packet.ID
+			}
+		}
+	}
+
+	// Adding packet to message
+	message.AddPacket(packet)
+
+	// Handling Expect: 100-continue requests
+	if message.expectType == httpExpect100Continue && len(message.packets) == message.headerPacket+1 {
+		seq := packet.Seq + uint32(message.Size())
+		t.seqWithData[seq] = packet.Ack
+		message.DataSeq = seq
+		message.complete = false
+
+		// In case if sequence packet came first
+		for _, m := range t.messages {
+			if m.Seq == seq {
+				t.deleteMessage(m)
+				if m.AssocMessage != nil {
+					message.setAssocMessage(m.AssocMessage)
+				}
+				// log.Println("2: Adding ack alias:", m.Ack, packet.Ack)
+				t.ackAliases[m.Ack] = packet.Ack
+
+				for _, pkt := range m.packets {
+					pkt.UpdateAck(packet.Ack)
+					message.AddPacket(pkt)
+				}
+			}
+		}
+
+		// Removing `Expect: 100-continue` header
+		packet.Data = proto.DeleteHeader(packet.Data, bExpectHeader)
+	}
+
+	// log.Println("Received message:", string(message.Bytes()), message.ID(), t.messages)
+
+	if isIncoming {
+		// If message have multiple packets, delete previous alias
+		if len(message.packets) > 1 {
+			delete(t.respAliases, message.ResponseAck)
+		}
+
+		message.UpdateResponseAck()
+		t.respAliases[message.ResponseAck] = message
+	}
+
+	// If message contains only single packet immediately dispatch it
+	if message.complete {
+		// log.Println("COMPLETE!", isIncoming, message)
+		if isIncoming {
+			if t.trackResponse {
+				// log.Println("Found response!", message.ResponseID, t.messages)
+
+				if resp, ok := t.messages[message.ResponseID]; ok {
+					if resp.complete {
+						t.dispatchMessage(resp)
+					}
+
+					t.dispatchMessage(message)
+				}
+			} else {
+				t.dispatchMessage(message)
+			}
+		} else {
+			if message.AssocMessage == nil {
+				return
+			}
+
+			if req, ok := t.messages[message.AssocMessage.ID()]; ok {
+				if req.complete {
+					t.dispatchMessage(req)
+					t.dispatchMessage(message)
+				}
+			}
+		}
+	}
+}
+
+func (t *Listener) IsReady() bool {
+	select {
+	case <-t.readyCh:
+		return true
+	case <-time.After(5 * time.Second):
+		return false
+	}
 }
 
 // Receive TCP messages from the listener channel
-func (t *Listener) Receive() *TCPMessage {
-    return <-t.c_messages
+func (t *Listener) Receiver() chan *TCPMessage {
+	return t.messagesChan
+}
+
+func (t *Listener) Close() {
+	close(t.quit)
+	if t.conn != nil {
+		t.conn.Close()
+	}
+
+	for _, h := range t.pcapHandles {
+		h.Close()
+	}
+
+	return
 }

raw_socket_listener/listener_test.go

@@ -0,0 +1,477 @@
+package rawSocket
+
+import (
+	"bytes"
+	"log"
+	"math/rand"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+func TestRawListenerInput(t *testing.T) {
+	var req, resp *TCPMessage
+
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket := buildPacket(true, 1, 1, []byte("GET / HTTP/1.1\r\n\r\n"), time.Now())
+
+	respAck := reqPacket.Seq + uint32(len(reqPacket.Data))
+	respPacket := buildPacket(false, respAck, reqPacket.Seq+1, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	listener.packetsChan <- reqPacket.dump()
+	listener.packetsChan <- respPacket.dump()
+
+	select {
+	case req = <-listener.messagesChan:
+	case <-time.After(time.Millisecond):
+		t.Error("Should return request immediately")
+		return
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+
+	select {
+	case resp = <-listener.messagesChan:
+	case <-time.After(20 * time.Millisecond):
+		t.Error("Should return response immediately")
+		return
+	}
+
+	if resp.IsIncoming {
+		t.Error("Should be response")
+	}
+}
+
+func TestRawListenerInputResponseByClose(t *testing.T) {
+	var req, resp *TCPMessage
+
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket := buildPacket(true, 1, 1, []byte("GET / HTTP/1.1\r\n\r\n"), time.Now())
+
+	respAck := reqPacket.Seq + uint32(len(reqPacket.Data))
+	respPacket := buildPacket(false, respAck, reqPacket.Seq+1, []byte("HTTP/1.1 200 OK\r\nConnection: close\r\n\r\nasd"), time.Now())
+	finPacket := buildPacket(false, respAck, reqPacket.Seq+2, []byte(""), time.Now())
+	finPacket.IsFIN = true
+
+	listener.packetsChan <- reqPacket.dump()
+	listener.packetsChan <- respPacket.dump()
+	listener.packetsChan <- finPacket.dump()
+
+	select {
+	case req = <-listener.messagesChan:
+	case <-time.After(time.Millisecond):
+		t.Error("Should return request immediately")
+		return
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+
+	select {
+	case resp = <-listener.messagesChan:
+	case <-time.After(20 * time.Millisecond):
+		t.Error("Should return response immediately")
+		return
+	}
+
+	if resp.IsIncoming {
+		t.Error("Should be response")
+	}
+}
+
+func TestRawListenerInputWithoutResponse(t *testing.T) {
+	var req *TCPMessage
+
+	listener := NewListener("", "0", EnginePcap, false, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket := buildPacket(true, 1, 1, []byte("GET / HTTP/1.1\r\n\r\n"), time.Now())
+
+	listener.packetsChan <- reqPacket.dump()
+
+	select {
+	case req = <-listener.messagesChan:
+	case <-time.After(time.Millisecond):
+		t.Error("Should return request immediately")
+		return
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+}
+
+func TestRawListenerResponse(t *testing.T) {
+	var req, resp *TCPMessage
+
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket := buildPacket(true, 1, 1, []byte("GET / HTTP/1.1\r\n\r\n"), time.Now())
+	respPacket := buildPacket(false, 1+uint32(len(reqPacket.Data)), 2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	// If response packet comes before request
+	listener.packetsChan <- respPacket.dump()
+	listener.packetsChan <- reqPacket.dump()
+
+	select {
+	case req = <-listener.messagesChan:
+	case <-time.After(time.Millisecond):
+		t.Error("Should return respose immediately")
+		return
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+
+	select {
+	case resp = <-listener.messagesChan:
+	case <-time.After(time.Millisecond):
+		t.Error("Should return response immediately")
+		return
+	}
+
+	if resp.IsIncoming {
+		t.Error("Should be response")
+	}
+
+	if !bytes.Equal(resp.UUID(), req.UUID()) {
+		t.Error("Resp and Req UUID should be equal")
+	}
+}
+
+func TestShort100Continue(t *testing.T) {
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket1 := buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\nExpect: 100-continue\r\n\r\n"), time.Now())
+	// Packet with data have different Seq
+	reqPacket2 := buildPacket(true, 2, reqPacket1.Seq+uint32(len(reqPacket1.Data)), []byte("a"), time.Now())
+	reqPacket3 := buildPacket(true, 2, reqPacket2.Seq+1, []byte("b"), time.Now())
+
+	respPacket1 := buildPacket(false, 10, 3, []byte("HTTP/1.1 100 Continue\r\n\r\n"), time.Now())
+
+	// panic(int(uint32(len(reqPacket1.Data)) + uint32(len(reqPacket2.Data)) + uint32(len(reqPacket3.Data))))
+	respPacket2 := buildPacket(false, reqPacket3.Seq+1 /* len of data */, 2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	result := []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\nab")
+
+	testRawListener100Continue(t, listener, result, reqPacket1, reqPacket2, reqPacket3, respPacket1, respPacket2)
+}
+
+// Response comes before Request
+func Test100ContinueWrongOrder(t *testing.T) {
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket1 := buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\nExpect: 100-continue\r\n\r\n"), time.Now())
+	// Packet with data have different Seq
+	reqPacket2 := buildPacket(true, 2, reqPacket1.Seq+uint32(len(reqPacket1.Data)), []byte("a"), time.Now())
+	reqPacket3 := buildPacket(true, 2, reqPacket2.Seq+1, []byte("b"), time.Now())
+
+	respPacket1 := buildPacket(false, 10, 3, []byte("HTTP/1.1 100 Continue\r\n"), time.Now())
+
+	// panic(int(uint32(len(reqPacket1.Data)) + uint32(len(reqPacket2.Data)) + uint32(len(reqPacket3.Data))))
+	respPacket2 := buildPacket(false, reqPacket3.Seq+1 /* len of data */, 2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	result := []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\nab")
+
+	testRawListener100Continue(t, listener, result, respPacket1, respPacket2, reqPacket1, reqPacket2, reqPacket3)
+}
+
+func TestAlt100ContinueHeaderOrder(t *testing.T) {
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket1 := buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nExpect: 100-continue\r\nContent-Length: 2\r\n\r\n"), time.Now())
+	// Packet with data have different Seq
+	reqPacket2 := buildPacket(true, 2, reqPacket1.Seq+uint32(len(reqPacket1.Data)), []byte("a"), time.Now())
+	reqPacket3 := buildPacket(true, 2, reqPacket2.Seq+1, []byte("b"), time.Now())
+
+	respPacket1 := buildPacket(false, 10, 3, []byte("HTTP/1.1 100 Continue\r\n"), time.Now())
+
+	// panic(int(uint32(len(reqPacket1.Data)) + uint32(len(reqPacket2.Data)) + uint32(len(reqPacket3.Data))))
+	respPacket2 := buildPacket(false, reqPacket3.Seq+1 /* len of data */, 2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	result := []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\nab")
+
+	testRawListener100Continue(t, listener, result, reqPacket1, reqPacket2, reqPacket3, respPacket1, respPacket2)
+}
+
+func testRawListener100Continue(t *testing.T, listener *Listener, result []byte, packets ...*TCPPacket) {
+	var req, resp *TCPMessage
+	for _, p := range packets {
+		listener.packetsChan <- p.dump()
+	}
+
+	select {
+	case req = <-listener.messagesChan:
+		break
+	case <-time.After(11 * time.Millisecond):
+		t.Error("Should return response after expire time")
+		return
+	}
+
+	if !bytes.Equal(req.Bytes(), result) {
+		t.Error("Should receive full message", string(req.Bytes()))
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+
+	select {
+	case resp = <-listener.messagesChan:
+		break
+	case <-time.After(21 * time.Millisecond):
+		t.Error("Should return response after expire time")
+		return
+	}
+
+	if resp.IsIncoming {
+		t.Error("Should be response")
+	}
+
+	if !bytes.Equal(resp.UUID(), req.UUID()) {
+		t.Error("Resp and Req UUID should be equal")
+	}
+}
+
+func testChunkedSequence(t *testing.T, listener *Listener, packets ...*TCPPacket) {
+	var r, req, resp *TCPMessage
+
+	for _, p := range packets {
+		listener.packetsChan <- p.dump()
+	}
+
+	select {
+	case r = <-listener.messagesChan:
+		if r.IsIncoming {
+			req = r
+		} else {
+			resp = r
+		}
+		break
+	case <-time.After(25 * time.Millisecond):
+		t.Error("Should return request after expire time")
+		return
+	}
+	select {
+	case r = <-listener.messagesChan:
+		if r.IsIncoming {
+			if req != nil {
+				t.Error("Request already received", r)
+				return
+			}
+			req = r
+		} else {
+			if resp != nil {
+				t.Error("Response already received", r)
+				return
+			}
+			resp = r
+		}
+		break
+	case <-time.After(25 * time.Millisecond):
+		t.Error("Should return request after expire time")
+		return
+	}
+
+	if !bytes.Equal(req.Bytes(), []byte("POST / HTTP/1.1\r\nTransfer-Encoding: chunked\r\n\r\n1\r\na\r\n1\r\nb\r\n0\r\n\r\n")) {
+		t.Error("Should receive full message", string(req.Bytes()))
+	}
+
+	if !req.IsIncoming {
+		t.Error("Should be request")
+	}
+
+	if resp.IsIncoming {
+		t.Error("Should be response")
+	}
+
+	if !bytes.Equal(resp.UUID(), req.UUID()) {
+		t.Error("Resp and Req UUID should be equal", string(resp.UUID()), string(req.UUID()))
+	}
+
+	time.Sleep(20 * time.Millisecond)
+
+	if len(listener.packetsChan) != 0 {
+		t.Fatal("packetsChan non empty:", listener.packetsChan)
+	}
+
+	if len(listener.messagesChan) != 0 {
+		t.Fatal("messagesChan non empty:", <-listener.messagesChan)
+	}
+
+	if len(listener.messages) != 0 {
+		t.Fatal("Messages non empty:", listener.messages)
+	}
+
+	if len(listener.ackAliases) != 0 {
+		t.Fatal("ackAliases non empty:", listener.ackAliases)
+	}
+
+	if len(listener.seqWithData) != 0 {
+		t.Fatal("seqWithData non empty:", listener.seqWithData)
+	}
+
+	if len(listener.respAliases) != 0 {
+		t.Fatal("respAliases non empty:", listener.respAliases)
+	}
+
+	if len(listener.respWithoutReq) != 0 {
+		t.Fatal("respWithoutReq non empty:", listener.respWithoutReq)
+	}
+}
+
+func permutation(n int, list []*TCPPacket) []*TCPPacket {
+	if len(list) == 1 {
+		return list
+	}
+
+	k := n % len(list)
+
+	first := []*TCPPacket{list[k]}
+	next := make([]*TCPPacket, len(list)-1)
+
+	copy(next, append(list[:k], list[k+1:]...))
+
+	return append(first, permutation(n/len(list), next)...)
+}
+
+// Response comes before Request
+func TestRawListenerChunkedWrongOrder(t *testing.T) {
+	listener := NewListener("", "0", EnginePcap, true, 10*time.Millisecond)
+	defer listener.Close()
+
+	reqPacket1 := buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nTransfer-Encoding: chunked\r\nExpect: 100-continue\r\n\r\n"), time.Now())
+	// Packet with data have different Seq
+	reqPacket2 := buildPacket(true, 2, reqPacket1.Seq+uint32(len(reqPacket1.Data)), []byte("1\r\na\r\n"), time.Now())
+	reqPacket3 := buildPacket(true, 2, reqPacket2.Seq+uint32(len(reqPacket2.Data)), []byte("1\r\nb\r\n"), time.Now())
+	reqPacket4 := buildPacket(true, 2, reqPacket3.Seq+uint32(len(reqPacket3.Data)), []byte("0\r\n\r\n"), time.Now())
+
+	respPacket1 := buildPacket(false, 10, 3, []byte("HTTP/1.1 100 Continue\r\n\r\n"), time.Now())
+
+	// panic(int(uint32(len(reqPacket1.Data)) + uint32(len(reqPacket2.Data)) + uint32(len(reqPacket3.Data))))
+	respPacket2 := buildPacket(false, reqPacket4.Seq+5 /* len of data */, 2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	// Should re-construct message from all possible combinations
+	for i := 0; i < 6*5*4*3*2*1; i++ {
+
+		// if i < 54 || i > 57 {
+		// 	continue
+		// }
+
+		packets := permutation(i, []*TCPPacket{reqPacket1, reqPacket2, reqPacket3, reqPacket4, respPacket1, respPacket2})
+
+		t.Log("permutation:", i)
+		testChunkedSequence(t, listener, packets...)
+	}
+}
+
+func chunkedPostMessage() []*TCPPacket {
+	ack := uint32(rand.Int63())
+	seq := uint32(rand.Int63())
+
+	reqPacket1 := buildPacket(true, ack, seq, []byte("POST / HTTP/1.1\r\nTransfer-Encoding: chunked\r\n\r\n"), time.Now())
+	// Packet with data have different Seq
+	reqPacket2 := buildPacket(true, ack, seq+47, []byte("1\r\na\r\n"), time.Now())
+	reqPacket3 := buildPacket(true, ack, reqPacket2.Seq+5, []byte("1\r\nb\r\n"), time.Now())
+	reqPacket4 := buildPacket(true, ack, reqPacket3.Seq+5, []byte("0\r\n\r\n"), time.Now())
+
+	respPacket := buildPacket(false, reqPacket4.Seq+5 /* len of data */, ack, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+
+	return []*TCPPacket{
+		reqPacket1, reqPacket2, reqPacket3, reqPacket4, respPacket,
+	}
+}
+
+func postMessage() []*TCPPacket {
+	ack := uint32(rand.Int63())
+	seq2 := uint32(rand.Int63())
+	seq := uint32(rand.Int63())
+
+	c := 10000
+	data := make([]byte, c)
+	rand.Read(data)
+
+	head := []byte("POST / HTTP/1.1\r\nContent-Length: 9958\r\n\r\n")
+	for i := range head {
+		data[i] = head[i]
+	}
+
+	return []*TCPPacket{
+		buildPacket(true, ack, seq, data, time.Now()),
+		buildPacket(false, seq+uint32(len(data)), seq2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now()),
+	}
+}
+
+func getMessage() []*TCPPacket {
+	ack := uint32(rand.Int63())
+	seq2 := uint32(rand.Int63())
+	seq := uint32(rand.Int63())
+
+	return []*TCPPacket{
+		buildPacket(true, ack, seq, []byte("GET / HTTP/1.1\r\n\r\n"), time.Now()),
+		buildPacket(false, seq+18, seq2, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now()),
+	}
+}
+
+// Response comes before Request
+func TestRawListenerBench(t *testing.T) {
+	l := NewListener("", "0", EnginePcap, true, 200*time.Millisecond)
+	defer l.Close()
+
+	// Should re-construct message from all possible combinations
+	for i := 0; i < 1000; i++ {
+		go func(i int) {
+			for j := 0; j < 100; j++ {
+				var packets []*TCPPacket
+
+				if j%5 == 0 {
+					packets = chunkedPostMessage()
+				} else if j%3 == 0 {
+					packets = postMessage()
+				} else {
+					packets = getMessage()
+				}
+
+				for _, p := range packets {
+					// Randomly drop packets
+					if (i+j)%5 == 0 {
+						if rand.Int63()%3 == 0 {
+							continue
+						}
+					}
+
+					l.packetsChan <- p.dump()
+					time.Sleep(time.Millisecond)
+				}
+
+				time.Sleep(5 * time.Millisecond)
+			}
+		}(i)
+	}
+
+	ch := l.Receiver()
+
+	var count int32
+
+	for {
+		select {
+		case <-ch:
+			atomic.AddInt32(&count, 1)
+		case <-time.After(2000 * time.Millisecond):
+			log.Println("Emitted 200000 messages, captured: ", count, len(l.ackAliases), len(l.seqWithData), len(l.respAliases), len(l.respWithoutReq), len(l.packetsChan))
+			return
+		}
+	}
+}

raw_socket_listener/tcp_message.go

@@ -1,12 +1,18 @@
-package raw_socket
+package rawSocket
 
 import (
-    "log"
-    "sort"
-    "time"
+	"bytes"
+	"crypto/sha1"
+	"encoding/binary"
+	"encoding/hex"
+	"github.com/buger/gor/proto"
+	"log"
+	"net"
+	"strconv"
+	"time"
 )
 
-const MSG_EXPIRE = 2000 * time.Millisecond
+var _ = log.Println
 
 // TCPMessage ensure that all TCP packets for given request is received, and processed in right sequence
 // Its needed because all TCP message can be fragmented or re-transmitted
@@ -15,91 +21,491 @@ const MSG_EXPIRE = 2000 * time.Millisecond
 // Message can be compiled from unique packets with same message_id which sorted by sequence
 // Message is received if we didn't receive any packets for 2000ms
 type TCPMessage struct {
-    ID      string // Message ID
-    packets []*TCPPacket
+	Seq         uint32
+	Ack         uint32
+	ResponseAck uint32
+	ResponseID  tcpID
+	DataAck     uint32
+	DataSeq     uint32
 
-    timer *time.Timer // Used for expire check
+	AssocMessage *TCPMessage
+	Start        time.Time
+	End          time.Time
+	IsIncoming   bool
 
-    c_packets chan *TCPPacket
+	packets []*TCPPacket
 
-    c_del_message chan *TCPMessage
+	delChan chan *TCPMessage
+
+	/* HTTP specific variables */
+	methodType    httpMethodType
+	bodyType      httpBodyType
+	expectType    httpExpectType
+	seqMissing    bool
+	headerPacket  int
+	contentLength int
+	complete      bool
 }
 
 // NewTCPMessage pointer created from a Acknowledgment number and a channel of messages readuy to be deleted
-func NewTCPMessage(ID string, c_del chan *TCPMessage) (msg *TCPMessage) {
-    msg = &TCPMessage{ID: ID}
+func NewTCPMessage(Seq, Ack uint32, IsIncoming bool, timestamp time.Time) (msg *TCPMessage) {
+	msg = &TCPMessage{Seq: Seq, Ack: Ack, IsIncoming: IsIncoming, Start: timestamp}
 
-    msg.c_packets = make(chan *TCPPacket)
-    msg.c_del_message = c_del // used for notifying that message completed or expired
-
-    // Every time we receive packet we reset this timer
-    msg.timer = time.AfterFunc(MSG_EXPIRE, msg.Timeout)
-
-    go msg.listen()
-
-    return
+	return
 }
 
-func (t *TCPMessage) listen() {
-    for {
-        select {
-        case packet, more := <-t.c_packets:
-            if more {
-                t.AddPacket(packet)
-            } else {
-                // Stop loop if channel closed
-                return
-            }
-        }
-    }
+func (t *TCPMessage) packetsData() (d [][]byte) {
+	d = make([][]byte, len(t.packets))
+	for i, p := range t.packets {
+		d[i] = p.Data
+	}
+
+	return
 }
 
-// Timeout notifies message to stop listening, close channel and message ready to be sent
-func (t *TCPMessage) Timeout() {
-    select {
-        // In some cases Timeout can be called multiple times (do not know how yet)
-        // Ensure that we did not close channel 2 times
-        case packet, ok := <- t.c_packets:
-            if ok {
-                t.AddPacket(packet)
-            } else {
-                return
-            }
-        default:
-            close(t.c_packets)
-            t.c_del_message <- t // Notify RAWListener that message is ready to be send to replay server
-    }
-}
-
-// Bytes sorts packets in right orders and return message content
+// Bytes return message content
 func (t *TCPMessage) Bytes() (output []byte) {
-    sort.Sort(BySeq(t.packets))
+	for _, p := range t.packets {
+		output = append(output, p.Data...)
+	}
 
-    for _, v := range t.packets {
-        output = append(output, v.Data...)
-    }
+	return output
+}
 
-    return output
+// Size returns total body size
+func (t *TCPMessage) BodySize() (size int) {
+	if len(t.packets) == 0 || t.headerPacket == -1 {
+		return 0
+	}
+
+	size += len(proto.Body(t.packets[t.headerPacket].Data))
+
+	for _, p := range t.packets[t.headerPacket+1:] {
+		size += len(p.Data)
+	}
+
+	return
+}
+
+// Size returns total size of message
+func (t *TCPMessage) Size() (size int) {
+	if len(t.packets) == 0 {
+		return 0
+	}
+
+	for _, p := range t.packets {
+		size += len(p.Data)
+	}
+
+	return
 }
 
 // AddPacket to the message and ensure packet uniqueness
 // TCP allows that packet can be re-send multiple times
 func (t *TCPMessage) AddPacket(packet *TCPPacket) {
-    packetFound := false
+	packetFound := false
 
-    for _, pkt := range t.packets {
-        if packet.Seq == pkt.Seq {
-            packetFound = true
-            break
-        }
-    }
+	for _, pkt := range t.packets {
+		if packet.Seq == pkt.Seq {
+			packetFound = true
+			break
+		}
+	}
 
-    if packetFound {
-        log.Println("Received packet with same sequence")
-    } else {
-        t.packets = append(t.packets, packet)
-    }
+	if !packetFound {
+		// Packets not always captured in same Seq order, and sometimes we need to prepend
+		if len(t.packets) == 0 || packet.Seq > t.packets[len(t.packets)-1].Seq {
+			t.packets = append(t.packets, packet)
+		} else if packet.Seq < t.packets[0].Seq {
+			t.packets = append([]*TCPPacket{packet}, t.packets...)
+			t.Seq = packet.Seq // Message Seq should indicated starting seq
+		} else { // insert somewhere in the middle...
+			for i, p := range t.packets {
+				if packet.Seq < p.Seq {
+					t.packets = append(t.packets[:i], append([]*TCPPacket{packet}, t.packets[i:]...)...)
+					break
+				}
+			}
+		}
 
-    // Reset message timeout timer
-    t.timer.Reset(MSG_EXPIRE)
+		if t.IsIncoming {
+			t.End = time.Now()
+		} else {
+			t.End = time.Now().Add(time.Millisecond)
+		}
+
+		if packet.OrigAck != 0 {
+			t.DataAck = packet.OrigAck
+		}
+
+		if packet.timestamp.Before(t.Start) {
+			t.Start = packet.timestamp
+		}
+	}
+
+	t.checkSeqIntegrity()
+	t.updateHeadersPacket()
+	t.updateMethodType()
+	t.updateBodyType()
+	t.checkIfComplete()
+	t.check100Continue()
+}
+
+// Check if there is missing packet
+func (t *TCPMessage) checkSeqIntegrity() {
+	if len(t.packets) == 1 {
+		t.seqMissing = false
+	}
+
+	offset := len(t.packets) - 1
+
+	if t.packets[offset].IsFIN {
+		offset--
+
+		if offset < 0 {
+			return
+		}
+	}
+
+	for i, p := range t.packets[:offset] {
+		if p.IsFIN {
+			continue
+		}
+
+		// If final packet
+		if len(t.packets) == i+1 {
+			t.seqMissing = false
+			return
+		}
+		np := t.packets[i+1]
+
+		nextSeq := p.Seq + uint32(len(p.Data))
+
+		if np.Seq != nextSeq {
+			if t.expectType == httpExpect100Continue {
+				if np.Seq != nextSeq+22 {
+					t.seqMissing = true
+					return
+				}
+			} else {
+				t.seqMissing = true
+				return
+			}
+		}
+	}
+
+	t.seqMissing = false
+}
+
+var bEmptyLine = []byte("\r\n\r\n")
+var bChunkEnd = []byte("0\r\n\r\n")
+
+func (t *TCPMessage) updateHeadersPacket() {
+	if len(t.packets) == 1 {
+		t.headerPacket = -1
+	}
+
+	if t.headerPacket != -1 {
+		return
+	}
+
+	if t.seqMissing {
+		return
+	}
+
+	for i, p := range t.packets {
+		if bytes.LastIndex(p.Data, bEmptyLine) != -1 {
+			t.headerPacket = i
+			return
+		}
+	}
+
+	return
+}
+
+// isMultipart returns true if message contains from multiple tcp packets
+func (t *TCPMessage) checkIfComplete() {
+	if t.seqMissing || t.headerPacket == -1 {
+		return
+	}
+
+	if t.methodType == httpMethodNotFound {
+		return
+	}
+
+	// Responses can be emitted only if we found request
+	if !t.IsIncoming && t.AssocMessage == nil {
+		return
+	}
+
+	// If one GET, OPTIONS, or HEAD request
+	if t.methodType == httpMethodWithoutBody {
+		t.complete = true
+	} else {
+		switch t.bodyType {
+		case httpBodyEmpty:
+			t.complete = true
+		case httpBodyContentLength:
+			if t.contentLength == 0 || t.contentLength == t.BodySize() {
+				t.complete = true
+			}
+		case httpBodyChunked:
+			lastPacket := t.packets[len(t.packets)-1]
+			if bytes.LastIndex(lastPacket.Data, bChunkEnd) != -1 {
+				t.complete = true
+			}
+		default:
+			if len(t.packets) == 0 {
+				return
+			}
+
+			last := t.packets[len(t.packets)-1]
+			if last.IsFIN {
+				t.complete = true
+			}
+		}
+	}
+}
+
+type httpMethodType uint8
+
+const (
+	httpMethodNotSet      httpMethodType = 0
+	httpMethodWithBody    httpMethodType = 1
+	httpMethodWithoutBody httpMethodType = 2
+	httpMethodNotFound    httpMethodType = 3
+)
+
+var methodsWithBody = [][]byte{
+	[]byte("POST"),
+	[]byte("PUT"),
+	[]byte("PATCH"),
+	[]byte("CONNECT"),
+}
+
+func (t *TCPMessage) updateMethodType() {
+	// if there is cache
+	if t.methodType != httpMethodNotSet && t.methodType != httpMethodNotFound {
+		return
+	}
+
+	d := t.packets[0].Data
+
+	// Minimum length fo request: GET / HTTP/1.1\r\n
+
+	if len(d) < 16 {
+		t.methodType = httpMethodNotFound
+		return
+	}
+
+	if t.IsIncoming {
+		var method []byte
+
+		if mIdx := bytes.IndexByte(d[:8], ' '); mIdx != -1 {
+			method = d[:mIdx]
+
+			// Check that after method we have absolute or relative path
+			switch d[mIdx+1] {
+			case '/', 'h', '*':
+			default:
+				t.methodType = httpMethodNotFound
+				return
+			}
+		} else {
+			t.methodType = httpMethodNotFound
+			return
+		}
+
+		for _, m := range methodsWithBody {
+			if len(m) == len(method) && bytes.Equal(m, method) {
+				t.methodType = httpMethodWithBody
+				return
+			}
+		}
+
+		t.methodType = httpMethodWithoutBody
+	} else {
+		if !bytes.Equal(d[:6], []byte("HTTP/1")) {
+			t.methodType = httpMethodNotFound
+			return
+		}
+
+		t.methodType = httpMethodWithBody
+	}
+}
+
+type httpBodyType uint8
+
+const (
+	httpBodyNotSet          httpBodyType = 0
+	httpBodyEmpty           httpBodyType = 1
+	httpBodyContentLength   httpBodyType = 2
+	httpBodyChunked         httpBodyType = 3
+	httpBodyConnectionClose httpBodyType = 4
+)
+
+func (t *TCPMessage) updateBodyType() {
+	// if there is cache
+	if t.bodyType != httpBodyNotSet {
+		return
+	}
+
+	// Headers not received
+	if t.headerPacket == -1 {
+		return
+	}
+
+	var lengthB, encB, connB []byte
+
+	proto.ParseHeaders(t.packetsData(), func(header, value []byte)bool{
+		if proto.HeadersEqual(header, []byte("Content-Length")) {
+			lengthB = value
+			return false
+		}
+
+		if proto.HeadersEqual(header, []byte("Transfer-Encoding")) {
+			encB = value
+			return false
+		}
+
+		if proto.HeadersEqual(header, []byte("Connection")) {
+			connB = value
+		}
+
+		return true
+	})
+
+	switch t.methodType {
+	case httpMethodNotFound:
+		return
+	case httpMethodWithoutBody:
+		t.bodyType = httpBodyEmpty
+		return
+	case httpMethodWithBody:
+		if len(lengthB) > 0 {
+			t.contentLength, _ = strconv.Atoi(string(lengthB))
+
+			if t.contentLength == 0 {
+				t.bodyType = httpBodyEmpty
+			} else {
+				t.bodyType = httpBodyContentLength
+			}
+			return
+		}
+
+		if len(encB) > 0 {
+			t.bodyType = httpBodyChunked
+			return
+		}
+
+		if len(connB) > 0 && bytes.Equal(connB, []byte("close")) {
+			t.bodyType = httpBodyConnectionClose
+			return
+		}
+	}
+
+	t.bodyType = httpBodyEmpty
+}
+
+type httpExpectType uint8
+
+const (
+	httpExpectNotSet      httpExpectType = 0
+	httpExpectEmpty       httpExpectType = 1
+	httpExpect100Continue httpExpectType = 2
+)
+
+var bExpectHeader = []byte("Expect")
+var bExpect100Value = []byte("100-continue")
+
+func (t *TCPMessage) check100Continue() {
+	if t.expectType != httpExpectNotSet || len(t.packets[0].Data) < 25 {
+		return
+	}
+
+	if t.methodType != httpMethodWithBody {
+		return
+	}
+
+	if t.seqMissing || t.headerPacket == -1 {
+		return
+	}
+
+	last := t.packets[len(t.packets)-1]
+	// reading last 4 bytes for double CRLF
+	if !bytes.HasSuffix(last.Data, bEmptyLine) {
+		return
+	}
+
+	var expectB []byte
+	proto.ParseHeaders(t.packetsData(), func(header, value []byte)bool{
+		if proto.HeadersEqual(header, bExpectHeader) {
+			expectB = value
+			return false
+		}
+
+		return true
+	})
+
+	if len(expectB) > 0 && bytes.Equal(bExpect100Value, expectB) {
+		t.expectType = httpExpect100Continue
+		return
+	}
+
+	t.expectType = httpExpectEmpty
+}
+
+func (t *TCPMessage) setAssocMessage(m *TCPMessage) {
+	t.AssocMessage = m
+	t.checkIfComplete()
+}
+
+// UpdateResponseAck should be called after packet is added
+func (t *TCPMessage) UpdateResponseAck() uint32 {
+	lastPacket := t.packets[len(t.packets)-1]
+	if lastPacket.IsFIN && len(t.packets) > 1 {
+		lastPacket = t.packets[len(t.packets)-2]
+	}
+
+	respAck := lastPacket.Seq + uint32(len(lastPacket.Data))
+
+	if t.ResponseAck != respAck {
+		t.ResponseAck = lastPacket.Seq + uint32(len(lastPacket.Data))
+
+		// We swappwed src and dst port
+		copy(t.ResponseID[:16], lastPacket.Addr)
+		copy(t.ResponseID[16:], lastPacket.Raw[2:4]) // Src port
+		copy(t.ResponseID[18:], lastPacket.Raw[0:2]) // Dest port
+		binary.BigEndian.PutUint32(t.ResponseID[20:24], t.ResponseAck)
+	}
+
+	return t.ResponseAck
+}
+
+func (t *TCPMessage) UUID() []byte {
+	var key []byte
+
+	if t.IsIncoming {
+		// log.Println("UUID:", t.Ack, t.Start.UnixNano())
+		key = strconv.AppendInt(key, t.Start.UnixNano(), 10)
+		key = strconv.AppendUint(key, uint64(t.Ack), 10)
+	} else {
+		// log.Println("RequestMessage:", t.AssocMessage.Ack, t.AssocMessage.Start.UnixNano())
+		key = strconv.AppendInt(key, t.AssocMessage.Start.UnixNano(), 10)
+		key = strconv.AppendUint(key, uint64(t.AssocMessage.Ack), 10)
+	}
+
+	uuid := make([]byte, 40)
+	sha := sha1.Sum(key)
+	hex.Encode(uuid, sha[:20])
+
+	return uuid
+}
+
+func (t *TCPMessage) ID() tcpID {
+	return t.packets[0].ID
+}
+
+func (t *TCPMessage) IP() net.IP {
+	return net.IP(t.packets[0].Addr)
 }

raw_socket_listener/tcp_message_test.go

@@ -0,0 +1,258 @@
+package rawSocket
+
+import (
+	"bytes"
+	"encoding/binary"
+	_ "log"
+	"testing"
+	"time"
+)
+
+func buildPacket(isIncoming bool, Ack, Seq uint32, Data []byte, timestamp time.Time) (packet *TCPPacket) {
+	var srcPort, destPort uint16
+
+	// For tests `listening` port is 0
+	if isIncoming {
+		srcPort = 1
+	} else {
+		destPort = 1
+	}
+
+	buf := make([]byte, 16)
+	binary.BigEndian.PutUint16(buf[2:4], destPort)
+	binary.BigEndian.PutUint16(buf[0:2], srcPort)
+	binary.BigEndian.PutUint32(buf[4:8], Seq)
+	binary.BigEndian.PutUint32(buf[8:12], Ack)
+	buf[12] = 64
+	buf = append(buf, Data...)
+
+	packet = ParseTCPPacket([]byte("123"), buf, timestamp)
+
+	return packet
+}
+
+func buildMessage(p *TCPPacket) *TCPMessage {
+	isIncoming := false
+	if p.SrcPort == 1 {
+		isIncoming = true
+	}
+
+	m := NewTCPMessage(p.Seq, p.Ack, isIncoming, p.timestamp)
+	m.AddPacket(p)
+
+	return m
+}
+
+func TestTCPMessagePacketsOrder(t *testing.T) {
+	msg := buildMessage(buildPacket(true, 1, 1, []byte("a"), time.Now()))
+	msg.AddPacket(buildPacket(true, 1, 2, []byte("b"), time.Now()))
+
+	if !bytes.Equal(msg.Bytes(), []byte("ab")) {
+		t.Error("Should contatenate packets in right order")
+	}
+
+	// When first packet have wrong order (Seq)
+	msg = buildMessage(buildPacket(true, 1, 2, []byte("b"), time.Now()))
+	msg.AddPacket(buildPacket(true, 1, 1, []byte("a"), time.Now()))
+
+	if !bytes.Equal(msg.Bytes(), []byte("ab")) {
+		t.Error("Should contatenate packets in right order")
+	}
+
+	// Should ignore packets with same sequence
+	msg = buildMessage(buildPacket(true, 1, 1, []byte("a"), time.Now()))
+	msg.AddPacket(buildPacket(true, 1, 1, []byte("a"), time.Now()))
+
+	if !bytes.Equal(msg.Bytes(), []byte("a")) {
+		t.Error("Should ignore packet with same Seq")
+	}
+}
+
+func TestTCPMessageSize(t *testing.T) {
+	msg := buildMessage(buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\na"), time.Now()))
+	msg.AddPacket(buildPacket(true, 1, 2, []byte("b"), time.Now()))
+
+	if msg.BodySize() != 2 {
+		t.Error("Should count only body", msg.BodySize())
+	}
+
+	if msg.Size() != 40 {
+		t.Error("Should count all sizes", msg.Size())
+	}
+}
+
+func TestTCPMessageIsComplete(t *testing.T) {
+	testCases := []struct {
+		direction         bool
+		payload           string
+		assocMessage      bool
+		expectedCompleted bool
+	}{
+		{true, "GET / HTTP/1.1\r\n\r\n", false, true},
+		{true, "HEAD / HTTP/1.1\r\n\r\n", false, true},
+		{false, "HTTP/1.1 200 OK\r\n\r\n", true, true},
+		{true, "POST / HTTP/1.1\r\nContent-Length: 1\r\n\r\na", false, true},
+		{true, "PUT / HTTP/1.1\r\nContent-Length: 1\r\n\r\na", false, true},
+		{false, "HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n", true, true},
+		{false, "HTTP/1.1 200 OK\r\nContent-Length: 1\r\n\r\na", true, true},
+		{false, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n0\r\n\r\n", true, true},
+
+		// chunked not finished
+		{false, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n", true, false},
+
+		// content-length != actual length
+		{true, "POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\na", false, false},
+		{false, "HTTP/1.1 200 OK\r\nContent-Length: 10\r\n\r\na", true, false},
+		// non-valid http request
+		{true, "UNKNOWN asd HTTP/1.1\r\n\r\n", false, false},
+
+		// response without associated request
+		{false, "HTTP/1.1 200 OK\r\n\r\n", false, false},
+	}
+
+	for _, tc := range testCases {
+		msg := buildMessage(buildPacket(tc.direction, 1, 1, []byte(tc.payload), time.Now()))
+		if tc.assocMessage {
+			msg.AssocMessage = &TCPMessage{}
+		}
+		msg.checkIfComplete()
+
+		if msg.complete != tc.expectedCompleted {
+			t.Errorf("Payload %s: Expected %t, got %t.", tc.payload, tc.expectedCompleted, msg.complete)
+		}
+	}
+}
+
+func TestTCPMessageIsSeqMissing(t *testing.T) {
+	p1 := buildPacket(false, 1, 1, []byte("HTTP/1.1 200 OK\r\n"), time.Now())
+	p2 := buildPacket(false, 1, p1.Seq+uint32(len(p1.Data)), []byte("Content-Length: 10\r\n\r\n"), time.Now())
+	p3 := buildPacket(false, 1, p2.Seq+uint32(len(p2.Data)), []byte("a"), time.Now())
+
+	msg := buildMessage(p1)
+	if msg.seqMissing {
+		t.Error("Should be complete if have only 1 packet")
+	}
+
+	msg.AddPacket(p3)
+	if !msg.seqMissing {
+		t.Error("Should be incomplete because missing middle component")
+	}
+
+	msg.AddPacket(p2)
+	if msg.seqMissing {
+		t.Error("Should be complete once missing packet added")
+	}
+}
+
+func TestTCPMessageIsHeadersReceived(t *testing.T) {
+	p1 := buildPacket(false, 1, 1, []byte("HTTP/1.1 200 OK\r\n\r\n"), time.Now())
+	p2 := buildPacket(false, 1, p1.Seq+uint32(len(p1.Data)), []byte("Content-Length: 10\r\n\r\n"), time.Now())
+
+	msg := buildMessage(p1)
+	if msg.headerPacket == -1 {
+		t.Error("Should be complete if have only 1 packet", msg.headerPacket)
+	}
+
+	msg.AddPacket(p2)
+	if msg.headerPacket == -1 {
+		t.Error("Should found double new line: headers received")
+	}
+
+	msg = buildMessage(buildPacket(true, 1, 1, []byte("GET / HTTP/1.1\r\nContent-Length: 1\r\n"), time.Now()))
+	if msg.headerPacket != -1 {
+		t.Error("Should not find headers end")
+	}
+}
+
+func TestTCPMessageMethodType(t *testing.T) {
+	testCases := []struct {
+		direction          bool
+		payload            string
+		expectedMethodType httpMethodType
+	}{
+		{true, "GET / HTTP/1.1\r\n\r\n", httpMethodWithoutBody},
+		{true, "GET * HTTP/1.1\r\n\r\n", httpMethodWithoutBody},
+		{true, "UNKNOWN / HTTP/1.1\r\n\r\n", httpMethodWithoutBody},
+		{true, "GET http://example.com HTTP/1.1\r\n\r\n", httpMethodWithoutBody},
+		{true, "POST / HTTP/1.1\r\n\r\n", httpMethodWithBody},
+		{true, "PUT / HTTP/1.1\r\n\r\n", httpMethodWithBody},
+		{true, "GET zxc HTTP/1.1\r\n\r\n", httpMethodNotFound},
+		{true, "GET / HTTP\r\n\r\n", httpMethodNotFound},
+		{true, "VERYLONGMETHOD / HTTP/1.1\r\n\r\n", httpMethodNotFound},
+		{false, "HTTP/1.1 200 OK\r\n\r\n", httpMethodWithBody},
+		{false, "HTTP /1.1 200 OK\r\n\r\n", httpMethodNotFound},
+	}
+
+	for _, tc := range testCases {
+		msg := buildMessage(buildPacket(tc.direction, 1, 1, []byte(tc.payload), time.Now()))
+
+		if msg.methodType != tc.expectedMethodType {
+			t.Errorf("Expected %d, got %d", tc.expectedMethodType, msg.methodType)
+		}
+	}
+}
+
+func TestTCPMessageBodyType(t *testing.T) {
+	testCases := []struct {
+		direction        bool
+		payload          string
+		expectedBodyType httpBodyType
+	}{
+		{true, "GET / HTTP/1.1\r\n\r\n", httpBodyEmpty},
+		{true, "POST / HTTP/1.1\r\n\r\n", httpBodyEmpty},
+		{true, "POST / HTTP/1.1\r\nUser-Agent: zxc\r\n\r\n", httpBodyEmpty},
+		{false, "HTTP/1.1 200 OK\r\n\r\n", httpBodyEmpty},
+		{true, "POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\nab", httpBodyContentLength},
+		{false, "HTTP/1.1 200 OK\r\nContent-Length: 2\r\n\r\nab", httpBodyContentLength},
+		{true, "POST / HTTP/1.1\r\nTransfer-Encoding: chunked\r\n\r\n2\r\nab\r\n0\r\n\r\n", httpBodyChunked},
+		{false, "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n2\r\nab\r\n0\r\n\r\n", httpBodyChunked},
+	}
+
+	for _, tc := range testCases {
+		msg := buildMessage(buildPacket(tc.direction, 1, 1, []byte(tc.payload), time.Now()))
+
+		if msg.bodyType != tc.expectedBodyType {
+			t.Errorf("Expected %d, got %d", tc.expectedBodyType, msg.bodyType)
+		}
+	}
+}
+
+func TestTCPMessageBodySize(t *testing.T) {
+	testCases := []struct {
+		direction    bool
+		payloads     []string
+		expectedSize int
+	}{
+		{true, []string{"GET / HTTP/1.1\r\n\r\n"}, 0},
+		{true, []string{"POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\nab"}, 2},
+		{true, []string{"GET / HTTP/1.1\r\n", "Content-Length: 2\r\n\r\nab"}, 2},
+		{true, []string{"GET / HTTP/1.1\r\n", "Content-Length: 2\r\n\r\n", "ab"}, 2},
+	}
+
+	for _, tc := range testCases {
+		msg := buildMessage(buildPacket(tc.direction, 1, 1, []byte(tc.payloads[0]), time.Now()))
+
+		if len(tc.payloads) > 1 {
+			for _, p := range tc.payloads[1:] {
+				seq := uint32(1 + msg.Size())
+				msg.AddPacket(buildPacket(tc.direction, 1, seq, []byte(p), time.Now()))
+			}
+		}
+
+		if msg.BodySize() != tc.expectedSize {
+			t.Errorf("Expected %d, got %d", tc.expectedSize, msg.BodySize())
+		}
+	}
+}
+
+func TestTcpMessageStart(t *testing.T) {
+	start := time.Now().Add(-1 * time.Second)
+
+	msg := buildMessage(buildPacket(true, 1, 2, []byte("b"), time.Now()))
+	msg.AddPacket(buildPacket(true, 1, 1, []byte("POST / HTTP/1.1\r\nContent-Length: 2\r\n\r\na"), start))
+
+	if msg.Start != start {
+		t.Error("Message timestamp should be equal to the lowest related packet timestamp", start, msg.Start)
+	}
+}
+

raw_socket_listener/tcp_packet.go

@@ -1,101 +1,133 @@
-package raw_socket
+package rawSocket
 
 import (
-    "encoding/binary"
-    "net"
-    "strconv"
-    "strings"
+	"encoding/binary"
+	"log"
+	"strconv"
+	"strings"
+	"time"
 )
 
+var _ = log.Println
+
 // TCP Flags
 const (
-    TCP_FIN = 1 << iota
-    TCP_SYN
-    TCP_RST
-    TCP_PSH
-    TCP_ACK
-    TCP_URG
-    TCP_ECE
-    TCP_CWR
-    TCP_NS
+	fFIN = 1 << iota
+	fSYN
+	fRST
+	fPSH
+	fACK
+	fURG
+	fECE
+	fCWR
+	fNS
 )
 
-// Simple TCP packet parser
-//
+type tcpID [24]byte
+
+// TCPPacket provides tcp packet parser
 // Packet structure: http://en.wikipedia.org/wiki/Transmission_Control_Protocol
 type TCPPacket struct {
-    SrcPort    uint16
-    DestPort   uint16
-    Seq        uint32
-    Ack        uint32
-    DataOffset uint8
-    Flags      uint16
-    Window     uint16
-    Checksum   uint16
-    Urgent     uint16
+	SrcPort    uint16
+	DestPort   uint16
+	Seq        uint32
+	Ack        uint32
+	OrigAck    uint32
+	DataOffset uint8
+	IsFIN      bool
 
-    Data []byte
-
-    Addr net.Addr
+	Raw  []byte
+	Data []byte
+	Addr []byte
+	timestamp time.Time
+	ID   tcpID
 }
 
-func ParseTCPPacket(addr net.Addr, b []byte) (p *TCPPacket) {
-    p = &TCPPacket{Data: b}
-    p.ParseBasic()
-    p.Addr = addr
+// ParseTCPPacket takes address and tcp payload and returns parsed TCPPacket
+func ParseTCPPacket(addr []byte, data []byte, timestamp time.Time) (p *TCPPacket) {
+	p = &TCPPacket{Raw: data}
+	p.ParseBasic()
+	p.Addr = addr
+	p.timestamp = timestamp
+	p.GenID()
 
-    return p
+	return
 }
 
-// Parse TCP Packet, inspired by: https://github.com/miekg/pcap/blob/master/packet.go
-func (t *TCPPacket) Parse() {
-    t.ParseBasic()
-    t.SrcPort = binary.BigEndian.Uint16(t.Data[0:2])
-    t.DestPort = binary.BigEndian.Uint16(t.Data[2:4])
-    t.Flags = binary.BigEndian.Uint16(t.Data[12:14]) & 0x1FF
-    t.Window = binary.BigEndian.Uint16(t.Data[14:16])
-    t.Checksum = binary.BigEndian.Uint16(t.Data[16:18])
-    t.Urgent = binary.BigEndian.Uint16(t.Data[18:20])
+func (p *TCPPacket) GenID() {
+	copy(p.ID[:16], p.Addr)
+	copy(p.ID[16:], p.Raw[0:2])  // Src port
+	copy(p.ID[18:], p.Raw[2:4])  // Dest port
+	copy(p.ID[20:], p.Raw[8:12]) // Ack
+}
+
+func (p *TCPPacket) UpdateAck(ack uint32) {
+	p.OrigAck = p.Ack
+	p.Ack = ack
+	binary.BigEndian.PutUint32(p.Raw[8:12], ack)
+	p.GenID()
 }
 
 // ParseBasic set of fields
 func (t *TCPPacket) ParseBasic() {
-    t.Seq = binary.BigEndian.Uint32(t.Data[4:8])
-    t.Ack = binary.BigEndian.Uint32(t.Data[8:12])
-    t.DataOffset = (t.Data[12] & 0xF0) >> 4
+	t.DestPort = binary.BigEndian.Uint16(t.Raw[2:4])
+	t.SrcPort = binary.BigEndian.Uint16(t.Raw[0:2])
+	t.Seq = binary.BigEndian.Uint32(t.Raw[4:8])
+	t.Ack = binary.BigEndian.Uint32(t.Raw[8:12])
+	t.DataOffset = (t.Raw[12] & 0xF0) >> 4
+	t.IsFIN = t.Raw[13]&0x01 != 0
+
+	// log.Println("DataOffset:", t.DataOffset, t.DestPort, t.SrcPort, t.Seq, t.Ack)
+
+	t.Data = t.Raw[t.DataOffset*4:]
+}
+
+func (t *TCPPacket) dump() *packet {
+
+	packetSrcIP := make([]byte, 16)
+	packetData := make([]byte, len(t.Data) + 16)
+
+	copy(packetSrcIP, t.Addr)
+
+	binary.BigEndian.PutUint16(packetData[0:2], t.SrcPort)
+	binary.BigEndian.PutUint16(packetData[2:4], t.DestPort)
+
+	binary.BigEndian.PutUint32(packetData[4:8], t.Seq)
+	binary.BigEndian.PutUint32(packetData[8:12], t.Ack)
+
+	packetData[12] = 64
+
+	if t.IsFIN {
+		packetData[13] = packetData[13] | 0x01
+	}
+
+	copy(packetData[16:], t.Data)
+
+	return &packet{
+		srcIP: packetSrcIP,
+		data:packetData,
+		timestamp:t.timestamp,
+	}
 
-    t.Data = t.Data[t.DataOffset*4:]
 }
 
 // String output for a TCP Packet
 func (t *TCPPacket) String() string {
-    return strings.Join([]string{
-        "Source port: " + strconv.Itoa(int(t.SrcPort)),
-        "Dest port:" + strconv.Itoa(int(t.DestPort)),
-        "Sequence:" + strconv.Itoa(int(t.Seq)),
-        "Acknowledgment:" + strconv.Itoa(int(t.Ack)),
-        "Header len:" + strconv.Itoa(int(t.DataOffset)),
+	maxLen := len(t.Data)
+	if maxLen > 200 {
+		maxLen = 200
+	}
 
-        "Flag ns:" + strconv.FormatBool(t.Flags&TCP_NS != 0),
-        "Flag crw:" + strconv.FormatBool(t.Flags&TCP_CWR != 0),
-        "Flag ece:" + strconv.FormatBool(t.Flags&TCP_ECE != 0),
-        "Flag urg:" + strconv.FormatBool(t.Flags&TCP_URG != 0),
-        "Flag ack:" + strconv.FormatBool(t.Flags&TCP_ACK != 0),
-        "Flag psh:" + strconv.FormatBool(t.Flags&TCP_PSH != 0),
-        "Flag rst:" + strconv.FormatBool(t.Flags&TCP_RST != 0),
-        "Flag syn:" + strconv.FormatBool(t.Flags&TCP_SYN != 0),
-        "Flag fin:" + strconv.FormatBool(t.Flags&TCP_FIN != 0),
+	return strings.Join([]string{
+		"Addr: " + string(t.Addr),
+		"Source port: " + strconv.Itoa(int(t.SrcPort)),
+		"Dest port:" + strconv.Itoa(int(t.DestPort)),
+		"Sequence:" + strconv.Itoa(int(t.Seq)),
+		"Acknowledgment:" + strconv.Itoa(int(t.Ack)),
+		"Header len:" + strconv.Itoa(int(t.DataOffset)),
+		"FIN:" + strconv.FormatBool(t.IsFIN),
 
-        "Window size:" + strconv.Itoa(int(t.Window)),
-        "Checksum:" + strconv.Itoa(int(t.Checksum)),
-
-        "Data size:" + strconv.Itoa(len(t.Data)),
-        "Data:" + string(t.Data),
-    }, "\n")
+		"Data size:" + strconv.Itoa(len(t.Data)),
+		"Data:" + string(t.Data[:maxLen]),
+	}, "\n")
 }
-
-type BySeq []*TCPPacket
-
-func (a BySeq) Len() int            { return len(a) }
-func (a BySeq) Swap(i, j int)       { a[i], a[j] = a[j], a[i] }
-func (a BySeq) Less(i, j int) bool  { return a[i].Seq < a[j].Seq }

settings.go

@@ -3,52 +3,67 @@ package main
 import (
 	"flag"
 	"fmt"
-	"log"
 	"os"
+	"sync"
+	"time"
 )
 
-const (
-	VERSION = "0.9.6"
-)
+var VERSION string
 
-// Allows to specify multiple flags with same name and collects all values to array
+// MultiOption allows to specify multiple flags with same name and collects all values into array
 type MultiOption []string
 
 func (h *MultiOption) String() string {
 	return fmt.Sprint(*h)
 }
 
+// Set gets called multiple times for each flag with same name
 func (h *MultiOption) Set(value string) error {
 	*h = append(*h, value)
 	return nil
 }
 
+// AppSettings is the struct of main configuration
 type AppSettings struct {
-	verbose bool
-	stats   bool
+	verbose   bool
+	debug     bool
+	stats     bool
+	exitAfter time.Duration
 
 	splitOutput bool
 
-	inputDummy  MultiOption
-	outputDummy MultiOption
+	inputDummy   MultiOption
+	outputDummy  MultiOption
+	outputStdout bool
+	outputNull   bool
 
 	inputTCP       MultiOption
 	outputTCP      MultiOption
 	outputTCPStats bool
 
-	inputFile  MultiOption
-	outputFile MultiOption
+	inputFile        MultiOption
+	inputFileLoop    bool
+	outputFile       MultiOption
+	outputFileConfig FileOutputConfig
 
-	inputRAW MultiOption
+	inputRAW              MultiOption
+	inputRAWEngine        string
+	inputRAWTrackResponse bool
+	inputRAWRealIPHeader  string
+
+	middleware string
 
 	inputHTTP  MultiOption
 	outputHTTP MultiOption
 
 	outputHTTPConfig HTTPOutputConfig
 	modifierConfig   HTTPModifierConfig
+
+	outputKafkaConfig KafkaConfig
 }
 
-var Settings AppSettings = AppSettings{}
+// Settings holds Gor configuration
+var Settings AppSettings
 
 func usage() {
 	fmt.Printf("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.\nProject page: https://github.com/buger/gor\nAuthor: <Leonid Bugaev> leonsbox@gmail.com\nCurrent Version: %s\n\n", VERSION)
@@ -59,33 +74,63 @@ func usage() {
 func init() {
 	flag.Usage = usage
 
-	flag.BoolVar(&Settings.verbose, "verbose", false, "Turn on verbose/debug output")
+	flag.BoolVar(&Settings.verbose, "verbose", false, "Turn on more verbose output")
+	flag.BoolVar(&Settings.debug, "debug", false, "Turn on debug output, shows all intercepted traffic. Works only when with `verbose` flag")
 	flag.BoolVar(&Settings.stats, "stats", false, "Turn on queue stats output")
+	flag.DurationVar(&Settings.exitAfter, "exit-after", 0, "exit after specified duration")
 
 	flag.BoolVar(&Settings.splitOutput, "split-output", false, "By default each output gets same traffic. If set to `true` it splits traffic equally among all outputs.")
 
 	flag.Var(&Settings.inputDummy, "input-dummy", "Used for testing outputs. Emits 'Get /' request every 1s")
-	flag.Var(&Settings.outputDummy, "output-dummy", "Used for testing inputs. Just prints data coming from inputs.")
+	flag.Var(&Settings.outputDummy, "output-dummy", "DEPRECATED: use --output-stdout instead")
+
+	flag.BoolVar(&Settings.outputStdout, "output-stdout", false, "Used for testing inputs. Just prints to console data coming from inputs.")
+
+	flag.BoolVar(&Settings.outputNull, "output-null", false, "Used for testing inputs. Drops all requests.")
 
 	flag.Var(&Settings.inputTCP, "input-tcp", "Used for internal communication between Gor instances. Example: \n\t# Receive requests from other Gor instances on 28020 port, and redirect output to staging\n\tgor --input-tcp :28020 --output-http staging.com")
 	flag.Var(&Settings.outputTCP, "output-tcp", "Used for internal communication between Gor instances. Example: \n\t# Listen for requests on 80 port and forward them to other Gor instance on 28020 port\n\tgor --input-raw :80 --output-tcp replay.local:28020")
 	flag.BoolVar(&Settings.outputTCPStats, "output-tcp-stats", false, "Report TCP output queue stats to console every 5 seconds.")
 
 	flag.Var(&Settings.inputFile, "input-file", "Read requests from file: \n\tgor --input-file ./requests.gor --output-http staging.com")
+	flag.BoolVar(&Settings.inputFileLoop, "input-file-loop", false, "Loop input files, useful for performance testing.")
+
 	flag.Var(&Settings.outputFile, "output-file", "Write incoming requests to file: \n\tgor --input-raw :80 --output-file ./requests.gor")
+	flag.DurationVar(&Settings.outputFileConfig.flushInterval, "output-file-flush-interval", time.Minute, "Interval for forcing buffer flush to the file, default: 60s.")
+	flag.BoolVar(&Settings.outputFileConfig.append, "output-file-append", false, "The flushed chunk is appended to existence file or not. ")
+
+	// Set default
+	Settings.outputFileConfig.sizeLimit.Set("32mb")
+	flag.Var(&Settings.outputFileConfig.sizeLimit, "output-file-size-limit", "Size of each chunk. Default: 32mb")
+	flag.IntVar(&Settings.outputFileConfig.queueLimit, "output-file-queue-limit", 256, "The length of the chunk queue. Default: 256")
 
 	flag.Var(&Settings.inputRAW, "input-raw", "Capture traffic from given port (use RAW sockets and require *sudo* access):\n\t# Capture traffic from 8080 port\n\tgor --input-raw :8080 --output-http staging.com")
 
-	flag.Var(&Settings.inputHTTP, "input-http", "Read requests from HTTP, should be explicitly sent from your application:\n\t# Listen for http on 9000\n\tgor --input-http :9000 --output-http staging.com")
+	flag.BoolVar(&Settings.inputRAWTrackResponse, "input-raw-track-response", false, "If turned on Gor will track responses in addition to requests, and they will be available to middleware and file output.")
+
+	flag.StringVar(&Settings.inputRAWEngine, "input-raw-engine", "libpcap", "Intercept traffic using `libpcap` (default), and `raw_socket`")
+
+	flag.StringVar(&Settings.inputRAWRealIPHeader, "input-raw-realip-header", "", "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")
+
+	flag.StringVar(&Settings.middleware, "middleware", "", "Used for modifying traffic using external command")
+
+	// flag.Var(&Settings.inputHTTP, "input-http", "Read requests from HTTP, should be explicitly sent from your application:\n\t# Listen for http on 9000\n\tgor --input-http :9000 --output-http staging.com")
 
 	flag.Var(&Settings.outputHTTP, "output-http", "Forwards incoming requests to given http address.\n\t# Redirect all incoming requests to staging.com address \n\tgor --input-raw :80 --output-http http://staging.com")
+	flag.IntVar(&Settings.outputHTTPConfig.BufferSize, "output-http-response-buffer", 0, "HTTP response buffer size, all data after this size will be discarded.")
 	flag.IntVar(&Settings.outputHTTPConfig.workers, "output-http-workers", 0, "Gor uses dynamic worker scaling by default.  Enter a number to run a set number of workers.")
 	flag.IntVar(&Settings.outputHTTPConfig.redirectLimit, "output-http-redirects", 0, "Enable how often redirects should be followed.")
+	flag.DurationVar(&Settings.outputHTTPConfig.Timeout, "output-http-timeout", 5*time.Second, "Specify HTTP request/response timeout. By default 5s. Example: --output-http-timeout 30s")
 
 	flag.BoolVar(&Settings.outputHTTPConfig.stats, "output-http-stats", false, "Report http output queue stats to console every 5 seconds.")
+	flag.BoolVar(&Settings.outputHTTPConfig.OriginalHost, "http-original-host", false, "Normally gor replaces the Host http header with the host supplied with --output-http.  This option disables that behavior, preserving the original Host header.")
+	flag.BoolVar(&Settings.outputHTTPConfig.Debug, "output-http-debug", false, "Enables http debug output.")
 
 	flag.StringVar(&Settings.outputHTTPConfig.elasticSearch, "output-http-elasticsearch", "", "Send request and response stats to ElasticSearch:\n\tgor --input-raw :8080 --output-http staging.com --output-http-elasticsearch 'es_host:api_port/index_name'")
 
+	flag.StringVar(&Settings.outputKafkaConfig.host, "output-kafka-host", "", "Send request and response stats to Kafka:\n\tgor --input-raw :8080 --output-kafka-host '192.168.0.1:9092,192.168.0.2:9092'")
+	flag.StringVar(&Settings.outputKafkaConfig.topic, "output-kafka-topic", "", "Send request and response stats to Kafka:\n\tgor --input-raw :8080 --output-kafka-topic 'kafka-log'")
+
 	flag.Var(&Settings.modifierConfig.headers, "http-set-header", "Inject additional headers to http reqest:\n\tgor --input-raw :8080 --output-http staging.com --http-set-header 'User-Agent: Gor'")
 	flag.Var(&Settings.modifierConfig.headers, "output-http-header", "WARNING: `--output-http-header` DEPRECATED, use `--http-set-header` instead")
 
@@ -94,10 +139,10 @@ func init() {
 	flag.Var(&Settings.modifierConfig.methods, "http-allow-method", "Whitelist of HTTP methods to replay. Anything else will be dropped:\n\tgor --input-raw :8080 --output-http staging.com --http-allow-method GET --http-allow-method OPTIONS")
 	flag.Var(&Settings.modifierConfig.methods, "output-http-method", "WARNING: `--output-http-method` DEPRECATED, use `--http-allow-method` instead")
 
-	flag.Var(&Settings.modifierConfig.urlRegexp, "http-allow-url", "A regexp to match requests against. Filter get matched agains full url with domain. Anything else will be dropped:\n\t gor --input-raw :8080 --output-http staging.com --http-allow-url ^www.")
+	flag.Var(&Settings.modifierConfig.urlRegexp, "http-allow-url", "A regexp to match requests against. Filter get matched against full url with domain. Anything else will be dropped:\n\t gor --input-raw :8080 --output-http staging.com --http-allow-url ^www.")
 	flag.Var(&Settings.modifierConfig.urlRegexp, "output-http-url-regexp", "WARNING: `--output-http-url-regexp` DEPRECATED, use `--http-allow-url` instead")
 
-	flag.Var(&Settings.modifierConfig.urlNegativeRegexp, "http-diallow-url", "A regexp to match requests against. Filter get matched agains full url with domain. Anything else will be dropped:\n\t gor --input-raw :8080 --output-http staging.com --http-disallow-url ^www.")
+	flag.Var(&Settings.modifierConfig.urlNegativeRegexp, "http-disallow-url", "A regexp to match requests against. Filter get matched against full url with domain. Anything else will be forwarded:\n\t gor --input-raw :8080 --output-http staging.com --http-disallow-url ^www.")
 
 	flag.Var(&Settings.modifierConfig.urlRewrite, "http-rewrite-url", "Rewrite the request url based on a mapping:\n\tgor --input-raw :8080 --output-http staging.com --http-rewrite-url /v1/user/([^\\/]+)/ping:/v2/user/$1/ping")
 	flag.Var(&Settings.modifierConfig.urlRewrite, "output-http-rewrite-url", "WARNING: `--output-http-rewrite-url` DEPRECATED, use `--http-rewrite-url` instead")
@@ -105,15 +150,27 @@ func init() {
 	flag.Var(&Settings.modifierConfig.headerFilters, "http-allow-header", "A regexp to match a specific header against. Requests with non-matching headers will be dropped:\n\t gor --input-raw :8080 --output-http staging.com --http-allow-header api-version:^v1")
 	flag.Var(&Settings.modifierConfig.headerFilters, "output-http-header-filter", "WARNING: `--output-http-header-filter` DEPRECATED, use `--http-allow-header` instead")
 
+	flag.Var(&Settings.modifierConfig.headerNegativeFilters, "http-disallow-header", "A regexp to match a specific header against. Requests with matching headers will be dropped:\n\t gor --input-raw :8080 --output-http staging.com --http-disallow-header \"User-Agent: Replayed by Gor\"")
+
 	flag.Var(&Settings.modifierConfig.headerHashFilters, "http-header-limiter", "Takes a fraction of requests, consistently taking or rejecting a request based on the FNV32-1A hash of a specific header:\n\t gor --input-raw :8080 --output-http staging.com --http-header-imiter user-id:25%")
 	flag.Var(&Settings.modifierConfig.headerHashFilters, "output-http-header-hash-filter", "WARNING: `output-http-header-hash-filter` DEPRECATED, use `--http-header-hash-limiter` instead")
 
 	flag.Var(&Settings.modifierConfig.paramHashFilters, "http-param-limiter", "Takes a fraction of requests, consistently taking or rejecting a request based on the FNV32-1A hash of a specific GET param:\n\t gor --input-raw :8080 --output-http staging.com --http-param-limiter user_id:25%")
 }
 
+var previousDebugTime int64
+var debugMutex sync.Mutex
+
+// Debug gets called only if --verbose flag specified
 func Debug(args ...interface{}) {
 	if Settings.verbose {
-		log.Print("[DEBUG] ")
-		log.Println(args...)
+		debugMutex.Lock()
+		now := time.Now()
+		diff := float64(now.UnixNano()-previousDebugTime) / 1000000
+		previousDebugTime = now.UnixNano()
+		debugMutex.Unlock()
+
+		fmt.Printf("[DEBUG][PID %d][%d][%fms] ", os.Getpid(), now.UnixNano(), diff)
+		fmt.Println(args...)
 	}
 }

test_input.go

@@ -3,12 +3,16 @@ package main
 import (
 	"crypto/rand"
 	"encoding/base64"
+	"time"
 )
 
+// TestInput used for testing purpose, it allows emitting requests on demand
 type TestInput struct {
 	data chan []byte
+	skipHeader bool
 }
 
+// NewTestInput constructor for TestInput
 func NewTestInput() (i *TestInput) {
 	i = new(TestInput)
 	i.data = make(chan []byte, 100)
@@ -18,33 +22,63 @@ func NewTestInput() (i *TestInput) {
 
 func (i *TestInput) Read(data []byte) (int, error) {
 	buf := <-i.data
-	copy(data, buf)
 
-	return len(buf), nil
+	var header []byte
+
+	if !i.skipHeader {
+		header = payloadHeader(RequestPayload, uuid(), time.Now().UnixNano(), -1)
+		copy(data[0:len(header)], header)
+		copy(data[len(header):], buf)
+	} else {
+		copy(data, buf)
+	}
+
+	return len(buf) + len(header), nil
 }
 
+func (i *TestInput) EmitBytes(data []byte) {
+	i.data <- data
+}
+
+// EmitGET emits GET request without headers
 func (i *TestInput) EmitGET() {
 	i.data <- []byte("GET / HTTP/1.1\r\n\r\n")
 }
 
+// EmitPOST emits POST request with Content-Length
 func (i *TestInput) EmitPOST() {
 	i.data <- []byte("POST /pub/WWW/ HTTP/1.1\r\nContent-Length: 7\r\nHost: www.w3.org\r\n\r\na=1&b=2")
 }
 
+// EmitChunkedPOST emits POST request with `Transfer-Encoding: chunked` and chunked body
 func (i *TestInput) EmitChunkedPOST() {
 	i.data <- []byte("POST /pub/WWW/ 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")
 }
 
-func (i *TestInput) EmitFile() {
-	size := 1024 * 1024 // 1 MB
+// EmitLargePOST emits POST request with large payload (5mb)
+func (i *TestInput) EmitLargePOST() {
+	size := 5 * 1024 * 1024 // 5 MB
 	rb := make([]byte, size)
 	rand.Read(rb)
 
 	rs := base64.URLEncoding.EncodeToString(rb)
 
-	i.data <- []byte("POST /pub/WWW/ HTTP/1.1\nHost: www.w3.org\r\n\r\n------WebKitFormBoundaryePkpFF7tjBAqx29L\nContent-Disposition: form-data; name=\"uploadedfile\"; filename=\"hello.o\"\nContent-Type: application/x-object\n" + rs + "\r\n\r\n")
+	i.data <- []byte("POST / HTTP/1.1\nHost: www.w3.org\nContent-Length:5242880\r\n\r\n" + rs)
+	Debug("Sent large POST")
 }
 
+// EmitSizedPOST emit a POST with a payload set to a supplied size
+func (i *TestInput) EmitSizedPOST(payloadSize int) {
+	rb := make([]byte, payloadSize)
+	rand.Read(rb)
+
+	rs := base64.URLEncoding.EncodeToString(rb)
+
+	i.data <- []byte("POST / HTTP/1.1\nHost: www.w3.org\nContent-Length:5242880\r\n\r\n" + rs)
+	Debug("Sent large POST")
+}
+
+// EmitOPTIONS emits OPTIONS request, similar to GET
 func (i *TestInput) EmitOPTIONS() {
 	i.data <- []byte("OPTIONS / HTTP/1.1\nHost: www.w3.org\r\n\r\n")
 }

test_output.go

@@ -2,10 +2,12 @@ package main
 
 type writeCallback func(data []byte)
 
+// TestOutput used in testing to intercept any output into callback
 type TestOutput struct {
 	cb writeCallback
 }
 
+// NewTestOutput constructor for TestOutput, accepts callback which get called on each incoming Write
 func NewTestOutput(cb writeCallback) (i *TestOutput) {
 	i = new(TestOutput)
 	i.cb = cb