Revert "修复一个导致 TPROXY 下 v2ray 断流的问题"

common/buf/copy.go

@@ -8,11 +8,6 @@ import (
 	"v2ray.com/core/common/signal"
 )
 
-// ActivityNotifiable is a object that accepts activity notification outside the object
-type ActivityNotifiable interface {
-	NotifyActivity() error
-}
-
 type dataHandler func(MultiBuffer)
 
 type copyHandler struct {
@@ -36,15 +31,6 @@ func UpdateActivity(timer signal.ActivityUpdater) CopyOption {
 	}
 }
 
-// NotifyActivity is a CopyOption to notify activity on each data copy operation.
-func NotifyActivity(notifier ActivityNotifiable) CopyOption {
-	return func(handler *copyHandler) {
-		handler.onData = append(handler.onData, func(MultiBuffer) {
-			notifier.NotifyActivity()
-		})
-	}
-}
-
 // CountSize is a CopyOption that sums the total size of data copied into the given SizeCounter.
 func CountSize(sc *SizeCounter) CopyOption {
 	return func(handler *copyHandler) {