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EM-Proxy ↑

EventMachine Proxy DSL for writing high-performance transparent / intercepting proxies in Ruby.

Getting started ↑

# install & configure gemcutter repos
gem update --system
gem install gemcutter
gem tumble

gem install em-proxy

irb:0> require 'em-proxy'

Simple port forwarding proxy ↑

Proxy.start(:host => "0.0.0.0", :port => 80, :debug => true) do |conn|
  conn.server :srv, :host => "127.0.0.1", :port => 81

  # modify / process request stream
  conn.on_data do |data|
    p [:on_data, data]
    data
  end

  # modify / process response stream
  conn.on_response do |backend, resp|
    p [:on_response, backend, resp]
    resp
  end

  # termination logic
  conn.on_finish do |backend, name|
    p [:on_finish, name]

    # terminate connection (in duplex mode, you can terminate when prod is done)
    unbind if backend == :srv
  end
end

For more examples see the /examples directory.

  • SMTP Spam Filtering

  • Duplicating traffic

  • Selective forwarding

  • Beanstalkd interceptor

  • etc.

A schema-free MySQL proof of concept, via an EM-Proxy server:

License ↑

(The MIT License)

Copyright © 2010 Ilya Grigorik

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ‘Software’), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ‘AS IS’, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.