jsierles/gist:288852

## gistfile1.rb
# gem install em-proxy

require 'rubygems'
require 'em-proxy'


APP_ROOT = File.expand_path(ARGV[0])

module Unicorn

  module RestartHandler
    def file_modified
      puts "#{path} modified"
      Manager.restart(File.dirname(path) + "/..")
    end
  end

  class Manager
    def self.start(dir, port)
      if !File.exists?("#{dir}/tmp/pids/unicorn.pid")
        puts "Start unicorn for #{dir} on #{port}"
        Dir.chdir(dir)
        cmd = File.exists?("#{dir}/config.ru") ? "unicorn -D -p #{port} config.ru" : "unicorn_rails -D -p #{port}"
        system cmd
      end
    end

    def self.monitor_for_restart(dir)
      puts "Start monitoring app at #{dir}"
      EM.watch_file("#{dir}/tmp/restart.txt", RestartHandler)
    end

    def self.stop(dir)
      if File.exists?("#{dir}/tmp/pids/unicorn.pid")
        Process.kill('TERM', File.read("#{dir}/tmp/pids/unicorn.pid"))
      end
    end
    def self.restart(dir)
      if File.exists?("#{dir}/tmp/pids/unicorn.pid")
        Process.kill('HUP', File.read("#{dir}/tmp/pids/unicorn.pid"))
      end
    end
  end
end

EM.kqueue = true if EM.kqueue? # file watching requires kqueue on OSX

Proxy.start(:host => "0.0.0.0", :port => ARGV[1].to_i) do |conn|

  conn.on_data do |data|
    server = data.scan(/\r\nHost: (.+)\r\n/).flatten.to_s.sub(/:\d+$/, '').split('.').last(2).first
    dir = "#{APP_ROOT}/#{server}"
    if !conn.instance_variable_get("@servers")[server]
      if File.directory?(dir)
        port = "37#{server.sum.to_s[0,3]}"
        conn.server server, :host => "127.0.0.1", :port => port
        Unicorn::Manager.start(dir, port)
        Unicorn::Manager.monitor_for_restart(dir)

        puts "sending request to #{server} on port #{port}"
        [data, [server]]
      else
        puts "no app directory found for #{server}"
        conn.send_data "HTTP/1.1 404 Not Found\r\nConnection: close\r\n<html>No app directory found for #{server}</html>"
      end
    end
  end

  conn.on_response do |backend, resp|
    resp
  end
end
	# gem install em-proxy

	require 'rubygems'
	require 'em-proxy'


	APP_ROOT = File.expand_path(ARGV[0])

	module Unicorn

	module RestartHandler
	def file_modified
	puts "#{path} modified"
	Manager.restart(File.dirname(path) + "/..")
	end
	end

	class Manager
	def self.start(dir, port)
	if !File.exists?("#{dir}/tmp/pids/unicorn.pid")
	puts "Start unicorn for #{dir} on #{port}"
	Dir.chdir(dir)
	cmd = File.exists?("#{dir}/config.ru") ? "unicorn -D -p #{port} config.ru" : "unicorn_rails -D -p #{port}"
	system cmd
	end
	end

	def self.monitor_for_restart(dir)
	puts "Start monitoring app at #{dir}"
	EM.watch_file("#{dir}/tmp/restart.txt", RestartHandler)
	end

	def self.stop(dir)
	if File.exists?("#{dir}/tmp/pids/unicorn.pid")
	Process.kill('TERM', File.read("#{dir}/tmp/pids/unicorn.pid"))
	end
	end
	def self.restart(dir)
	if File.exists?("#{dir}/tmp/pids/unicorn.pid")
	Process.kill('HUP', File.read("#{dir}/tmp/pids/unicorn.pid"))
	end
	end
	end
	end

	EM.kqueue = true if EM.kqueue? # file watching requires kqueue on OSX

	Proxy.start(:host => "0.0.0.0", :port => ARGV[1].to_i) do \|conn\|

	conn.on_data do \|data\|
	server = data.scan(/\r\nHost: (.+)\r\n/).flatten.to_s.sub(/:\d+$/, '').split('.').last(2).first
	dir = "#{APP_ROOT}/#{server}"
	if !conn.instance_variable_get("@servers")[server]
	if File.directory?(dir)
	port = "37#{server.sum.to_s[0,3]}"
	conn.server server, :host => "127.0.0.1", :port => port
	Unicorn::Manager.start(dir, port)
	Unicorn::Manager.monitor_for_restart(dir)

	puts "sending request to #{server} on port #{port}"
	[data, [server]]
	else
	puts "no app directory found for #{server}"
	conn.send_data "HTTP/1.1 404 Not Found\r\nConnection: close\r\n<html>No app directory found for #{server}</html>"
	end
	end
	end

	conn.on_response do \|backend, resp\|
	resp
	end
	end