EventMachine

Introduction to EventMachine given at Ruby::AZ

Transcript

1. EventMachine Chris Gaffney Collective Idea Ruby::AZ January 10, 2011 Making networking not suck
2. C10k API Toolbox
3. TCPServer.new
4. require "socket" server = TCPServer.new("0.0.0.0", 1845) loop do client = server.accept while line = client.gets client.write(line) end end
5. require "socket" server = TCPServer.new("0.0.0.0", 1845) loop do client = server.accept while line = client.gets client.write(line) end end
6. require "socket" server = TCPServer.new("0.0.0.0", 1845) loop do client = server.accept Thread.new do while line = client.gets client.write(line) end end end
7. IO.select
8. server = TCPServer.new(1845) clients = [] loop do ready = IO.select([server] + clients) ready[0].each do |socket| if socket == server clients << socket.accept_nonblock else data = socket.recv_nonblock(256) if data.size > 0 socket.sendmsg_nonblock(data) else clients.delete(socket) end end end end
9. Reactor
10. require 'rubygems' require 'eventmachine' module Server def receive_data(data) send_data(data) end end EventMachine.run do EventMachine.start_server('0.0.0.0', 1845, Server) end
11. C10k API Toolbox
12. class Server < EventMachine::Connection # def post_init # def receive_data(data) # def unbind end EventMachine.run do EventMachine.start_server('127.0.0.1', 1845, Server) end
13. class Client < EventMachine::Connection # def post_init # def connection_completed # def receive_data(data) # def unbind end EventMachine.run do EventMachine.connect('localhost', 1845, Client) EventMachine.connect('localhost', 1845, Client) end
14. EventMachine.add_periodic_timer(5) do send_ping end EventMachine.add_timer(30) do close_connection unless response end timer = EventMachine::PeriodicTimer.new(60) do run_crons end # timer.cancel
15. EventMachine .add_timer(delay, &block) .add_periodic_timer(delay, &block) .connect(bind, port, handler, *args) .start_server(bind, port, handler, *args) .run(&block) EventMachine::Connection #send_data(data) #close_connection(after_writing = false) #reconnect(server, port) Rdocs: http://rubyeventmachine.com/
16. C10k API Toolkit
17. em-http-request EventMachine.run do query = { :lat => '37.704276', :lng => '-85.871227', :radius => 50 } head = { :accept => 'application/json' } http = EventMachine::HttpRequest.new("http://api.gowalla.com/spots"). get(:query => query, :head => head) http.callback do data = Yajl::Parser.parse(http.response) data['spots'].each do |spot| # American Legion Public Pool @ 37.705699083:-85.8540598 puts "#{spot['name']} @ #{spot['lat']}:#{spot['lng']}" end end end
18. em-mongo EventMachine.run do mongo = EM::Mongo::Connection.new.db("demos") tweets = mongo.collection("tweets") tweets.insert({ :user => 'gaffneyc', :text => 'Hello from Ruby::AZ'}) tweets.find(:user => 'gaffneyc') do |results| # [{ # "_id" => BSON::ObjectId('4d2a0037f50f833b19000001'), # "user" => "gaffneyc", # "text" => "Hello from Ruby::AZ" # }] end # tweets.remove(id) # tweets.update(conditions, updates) end
19. em-redis EventMachine.run do redis = EM::Protocols::Redis.connect redis.set("test", "5000") do |_| redis.get("test") do |result| # "5000" puts result.inspect redis.delete("test") end end end Protip: Resque.redis = EM::Protocols::Redis.connect
20. twitter-stream EventMachine.run do stream = ::Twitter::JSONStream.connect( :filters => "ruby,rails,collectiveidea", :auth => "[username:password]" ) stream.each_item do |item| tweet = Yajl::Parser.parse(item) # {"text"=>"So.. I just found out Justin Bieber's in the...} puts tweet.inspect end # stream.on_error # stream.on_max_reconnects end
21. ‣ amqp https://github.com/tmm1/amqp/ ‣ em-websocket https://github.com/igrigorik/em-websocket ‣ em-spec https://github.com/joshbuddy/em-spec ‣ em-synchrony https://github.com/igrigorik/em-synchrony
22. ‣ em-http-request https://github.com/igrigorik/em-http-request ‣ em-mongo https://github.com/bcg/em-mongo ‣ em-redis https://github.com/libc/em-redis ‣ twitter-stream https://github.com/voloko/twitter-stream
23. https://github.com/gaffneyc/eventmachine_demos
24. Chris Gaffney http://collectiveidea.com http://github.com/gaffneyc @gaffneyc
25. Photos Reactor http://www.flickr.com/photos/voodoozebra/5151489/ API http://www.flickr.com/photos/andrewmorrell/76088141/ Toolkit http://www.flickr.com/photos/dipster1/1403240351/