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|
#--
#
# Author:: Francis Cianfrocca (gmail: blackhedd)
# Homepage:: http://rubyeventmachine.com
# Date:: 15 November 2006
#
# See EventMachine and EventMachine::Connection for documentation and
# usage examples.
#
#----------------------------------------------------------------------------
#
# Copyright (C) 2006-07 by Francis Cianfrocca. All Rights Reserved.
# Gmail: blackhedd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of either: 1) the GNU General Public License
# as published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version; or 2) Ruby's License.
#
# See the file COPYING for complete licensing information.
#
#---------------------------------------------------------------------------
#
#
#
module EventMachine
module Protocols
# Implements Stomp (http://docs.codehaus.org/display/STOMP/Protocol).
#
# == Usage example
#
# module StompClient
# include EM::Protocols::Stomp
#
# def connection_completed
# connect :login => 'guest', :passcode => 'guest'
# end
#
# def receive_msg msg
# if msg.command == "CONNECTED"
# subscribe '/some/topic'
# else
# p ['got a message', msg]
# puts msg.body
# end
# end
# end
#
# EM.run{
# EM.connect 'localhost', 61613, StompClient
# }
#
module Stomp
include LineText2
class Message
# The command associated with the message, usually 'CONNECTED' or 'MESSAGE'
attr_accessor :command
# Hash containing headers such as destination and message-id
attr_accessor :header
alias :headers :header
# Body of the message
attr_accessor :body
# @private
def initialize
@header = {}
@state = :precommand
@content_length = nil
end
# @private
def consume_line line
if @state == :precommand
unless line =~ /\A\s*\Z/
@command = line
@state = :headers
end
elsif @state == :headers
if line == ""
if @content_length
yield( [:sized_text, @content_length+1] )
else
@state = :body
yield( [:unsized_text] )
end
elsif line =~ /\A([^:]+):(.+)\Z/
k = $1.dup.strip
v = $2.dup.strip
@header[k] = v
if k == "content-length"
@content_length = v.to_i
end
else
# This is a protocol error. How to signal it?
end
elsif @state == :body
@body = line
yield( [:dispatch] )
end
end
end
# @private
def send_frame verb, headers={}, body=""
body = body.to_s
ary = [verb, "\n"]
body_bytesize = body.bytesize if body.respond_to? :bytesize
body_bytesize ||= body.size
headers.each {|k,v| ary << "#{k}:#{v}\n" }
ary << "content-length: #{body_bytesize}\n"
ary << "content-type: text/plain; charset=UTF-8\n" unless headers.has_key? 'content-type'
ary << "\n"
ary << body
ary << "\0"
send_data ary.join
end
# @private
def receive_line line
@stomp_initialized || init_message_reader
@stomp_message.consume_line(line) {|outcome|
if outcome.first == :sized_text
set_text_mode outcome[1]
elsif outcome.first == :unsized_text
set_delimiter "\0"
elsif outcome.first == :dispatch
receive_msg(@stomp_message) if respond_to?(:receive_msg)
init_message_reader
end
}
end
# @private
def receive_binary_data data
@stomp_message.body = data[0..-2]
receive_msg(@stomp_message) if respond_to?(:receive_msg)
init_message_reader
end
# @private
def init_message_reader
@stomp_initialized = true
set_delimiter "\n"
set_line_mode
@stomp_message = Message.new
end
# Invoked with an incoming Stomp::Message received from the STOMP server
def receive_msg msg
# stub, overwrite this in your handler
end
# CONNECT command, for authentication
#
# connect :login => 'guest', :passcode => 'guest'
#
def connect parms={}
send_frame "CONNECT", parms
end
# SEND command, for publishing messages to a topic
#
# send '/topic/name', 'some message here'
#
def send destination, body, parms={}
send_frame "SEND", parms.merge( :destination=>destination ), body.to_s
end
# SUBSCRIBE command, for subscribing to topics
#
# subscribe '/topic/name', false
#
def subscribe dest, ack=false
send_frame "SUBSCRIBE", {:destination=>dest, :ack=>(ack ? "client" : "auto")}
end
# ACK command, for acknowledging receipt of messages
#
# module StompClient
# include EM::P::Stomp
#
# def connection_completed
# connect :login => 'guest', :passcode => 'guest'
# # subscribe with ack mode
# subscribe '/some/topic', true
# end
#
# def receive_msg msg
# if msg.command == "MESSAGE"
# ack msg.headers['message-id']
# puts msg.body
# end
# end
# end
#
def ack msgid
send_frame "ACK", 'message-id'=> msgid
end
end
end
end
|
