AMQP Server using AMQP and EM-Websockets
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require 'rubygems' | |
require 'amqp' | |
require 'mongo' | |
require 'em-websocket' | |
require 'json' | |
class MessageParser | |
# message format => "room:harry_potter, nickname:siddharth, room:members" | |
def self.parse(message) | |
parsed_message = JSON.parse(message) | |
puts "---PARSED MESSAGE ---" + parsed_message.inspect | |
response = {} | |
if parsed_message['status'] == 'status' | |
response[:status] = 'STATUS' | |
response[:username] = parsed_message['username'] | |
response[:roomname] = parsed_message['roomname'] | |
elsif parsed_message['status'] == 'message' | |
response[:status] = 'MESSAGE' | |
response[:message] = parsed_message['message'] | |
response[:username] = parsed_message['username'] | |
response[:roomname] = parsed_message['roomname'].split().join('_') | |
end | |
response | |
end | |
end | |
class MongoManager | |
def self.establish_connection(database) | |
@db ||= Mongo::Connection.new('localhost', 27017).db(database) | |
@rooms = @db.collection('rooms') | |
@db | |
end | |
def self.save_message(db, room_name, message, timestamp) | |
posts ||= db.collection("#{room_name.split().joins('_')}") | |
end | |
end | |
@sockets = [] | |
EventMachine.run do | |
connection = AMQP.connect(:host => '127.0.0.1') | |
channel = AMQP::Channel.new(connection) | |
puts "Connected to AMQP broker. #{AMQP::VERSION} " | |
mongo = MongoManager.establish_connection("trackertalk_development") | |
EventMachine::WebSocket.start(:host => '127.0.0.1', :port => 8080) do |ws| | |
socket_detail = {:socket => ws} | |
ws.onopen do | |
@sockets << socket_detail | |
end | |
ws.onmessage do |message| | |
puts "Message : #{message}" | |
status = MessageParser.parse(message) | |
exchange = channel.fanout(status[:roomname].split().join('_')) | |
exchange.publish("#{status[:username]} has just joined #{status[:roomname]}") | |
posts = MongoManager.get_room_posts(mongo, status[:roomname]) | |
if status[:status] == 'STATUS' | |
queue = channel.queue(status[:username]) | |
queue.unsubscribe if queue.subscribed? | |
queue.bind(exchange).subscribe do |payload| | |
puts "PAYLOAD : #{payload}" | |
ws.send(payload) | |
end | |
# only after 0.8.0rc14 | |
#queue = channel.queue(status[:username], :durable => true) | |
#AMQP::Consumer.new(channel, queue) | |
elsif status[:status] == 'MESSAGE' | |
full_message = "<b> #{status[:username]} :</b> #{status[:message]}" | |
exchange.publish(full_message) | |
end | |
end | |
ws.onclose do | |
@sockets.delete ws | |
end | |
end | |
end |
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