Simple Ruby Websockets

Gemfile

source 'http://rubygems.org'

gem 'em-http-request', :require => 'em-http'
gem 'em-websocket'

server.rb

# = Simple "Ping:Pong" websocket server
#
# See https://github.com/igrigorik/em-http-request/blob/master/examples/websocket-server.rb

require 'rubygems'
require 'em-websocket'

HOST, PORT = '0.0.0.0', 8000

EventMachine.run do

  puts '='*80, "Starting websockets server at socket://#{HOST}:#{PORT}", '='*80

  EventMachine::WebSocket.start(:host => HOST, :port => PORT) do |socket|

    socket.onopen do
      puts "#{Time.now.strftime('%H:%M:%S')} : Client connected", '-'*80
      socket.send "Hello client!"
      EventMachine.add_periodic_timer(1) { socket.send '.' } # Tick...
    end

    socket.onclose do
      puts "#{Time.now.strftime('%H:%M:%S')} : Client disconnected", '-'*80
    end

    socket.onmessage do |msg|
      puts "Recieved message: #{msg.inspect}"
      socket.send "Hi there, I thought I'd let you know that we received your message: #{msg.inspect}"
    end

  end

end