gor

About

Gor is a simple http traffic replication tool written in Go. Its main goal is to replay traffic from production servers to staging and dev environments.

Now you can test your code on real user sessions in an automated and repeatable fashion.
No more falling down in production!

Gor consists of 2 parts: listener and replay servers.

The listener server catches http traffic from a given port in real-time and sends it to the replay server. The replay server forwards traffic to a given address.

Basic example

# Run on servers where you want to catch traffic. You can run it on each `web` machine.
sudo gor listen -p 80 -r replay.server.local:28020 

# Replay server (replay.server.local). 
gor replay -f http://staging.server -p 28020

Advanced use

Rate limiting

The replay server supports rate limiting. It can be useful if you want forward only part of production traffic and not overload your staging environment. You can specify your desired requests per second using the "|" operator after the server address:

# staging.server will not get more than 10 requests per second
gor replay -f "http://staging.server|10"

Forward to multiple addresses

You can forward traffic to multiple endpoints. Just separate the addresses by coma.

gor replay -f "http://staging.server|10,http://dev.server|5"

Additional help

$ gor listen -h
Usage of ./bin/gor-linux:
  -i="any": By default it try to listen on all network interfaces.To get list of interfaces run `ifconfig`
  -p=80: Specify the http server port whose traffic you want to capture
  -r="localhost:28020": Address of replay server.

$ gor replay -h
Usage of ./bin/gor-linux:
  -f="http://localhost:8080": http address to forward traffic.
	You can limit requests per second by adding `|#{num}` after address.
	If you have multiple addresses with different limits. For example: http://staging.example.com|100,http://dev.example.com|10
  -ip="0.0.0.0": ip addresses to listen on
  -p=28020: specify port number

Pre-build binaries

Download binaries (linux 32/64, darwin)

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 gor.go to get binary, or go run gor.go to build and run (useful for development)

FAQ

Why does the gor listener requires sudo or root access?

Listener works by sniffing traffic from a given port. It's accessible only by using sudo or root access.

Do you support all http request types?

Yes. Right now it supports only "GET" requests.

TODO

Use buffering for request throttling instead of simple rate limiting.

Better stats

Optimize for load testing cases