ProxyMachine —— 7 层 TCP 路由代理

Proxy Machine 是一个简单的 7 层 TCP 路由代理，基于 EventMachine 构建，可使用 Ruby 语言配置路由规则。如果你需要将不同的请求内容转发到后端不同的服务器上，那么 ProxyMachine 非常适合你。

ProxyMachine 主要为 Github 的集群架构而开发，每天可代理几百万请求，性能和内存占用表现良好。

安装：

$ gem install proxymachine -s http://gemcutter.org

使用方法：

Usage:
  proxymachine -c <config file> [-h <host>] [-p <port>]

Options:
  -c, --config CONFIG              Configuration file
  -h, --host HOST                  Hostname to bind. Default 0.0.0.0
  -p, --port PORT                  Port to listen on. Default 5432

示例配置：

class GitRouter
  # Look at the routing table and return the correct address for +name+
  # Returns "<host>:<port>" e.g. "ae8f31c.example.com:9418"
  def self.lookup(name)
    ...
  end
end

# Perform content-aware routing based on the stream data. Here, the
# header information from the Git protocol is parsed to find the 
# username and a lookup routine is run on the name to find the correct
# backend server. If no match can be made yet, do nothing with the
# connection.
proxy do |data|
  if data =~ %r{^....git-upload-pack /([\w\.\-]+)/[\w\.\-]+\000host=\w+\000}
    name = $1
    { :remote => GitRouter.lookup(name) }
  else
    { :noop => true }
  end
end

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