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|
module StompServer
module StompServer::Protocols
VALID_COMMANDS = [:connect, :send, :subscribe, :unsubscribe, :begin, :commit, :abort, :ack, :disconnect]
class Stomp < EventMachine::Connection
def initialize *args
super
end
def post_init
@sfr = StompServer::StompFrameRecognizer.new
@transactions = {}
@connected = false
end
def receive_data(data)
stomp_receive_data(data)
end
def stomp_receive_data(data)
begin
puts "receive_data: #{data.inspect}" if $DEBUG
@sfr << data
process_frames
rescue Exception => e
puts "err: #{e} #{e.backtrace.join("\n")}"
send_error(e.to_s)
close_connection_after_writing
end
end
def stomp_receive_frame(frame)
begin
puts "receive_frame: #{frame.inspect}" if $DEBUG
process_frame(frame)
rescue Exception => e
puts "err: #{e} #{e.backtrace.join("\n")}"
send_error(e.to_s)
close_connection_after_writing
end
end
def process_frames
frame = nil
process_frame(frame) while frame = @sfr.frames.shift
end
def process_frame(frame)
cmd = frame.command.downcase.to_sym
raise "Unhandled frame: #{cmd}" unless VALID_COMMANDS.include?(cmd)
raise "Not connected" if !@connected && cmd != :connect
# I really like this code, but my needs are a little trickier
#
if trans = frame.headers['transaction']
handle_transaction(frame, trans, cmd)
else
cmd = :sendmsg if cmd == :send
send(cmd, frame)
end
send_receipt(frame.headers['receipt']) if frame.headers['receipt']
end
def handle_transaction(frame, trans, cmd)
if [:begin, :commit, :abort].include?(cmd)
send(cmd, frame, trans)
else
raise "transaction does not exist" unless @transactions.has_key?(trans)
@transactions[trans] << frame
end
end
def connect(frame)
if @@auth_required
unless frame.headers['login'] and frame.headers['passcode'] and @@stompauth.authorized[frame.headers['login']] == frame.headers['passcode']
raise "Invalid Login"
end
end
puts "Connecting" if $DEBUG
response = StompServer::StompFrame.new("CONNECTED", {'session' => 'wow'})
stomp_send_data(response)
@connected = true
end
def sendmsg(frame)
# set message id
if frame.dest.match(%r|^/queue|)
@@queue_manager.sendmsg(frame)
else
frame.headers['message-id'] = "msg-#stompcma-#{@@topic_manager.next_index}"
@@topic_manager.sendmsg(frame)
end
end
def subscribe(frame)
use_ack = false
use_ack = true if frame.headers['ack'] == 'client'
if frame.dest =~ %r|^/queue|
@@queue_manager.subscribe(frame.dest, self,use_ack)
else
@@topic_manager.subscribe(frame.dest, self)
end
end
def unsubscribe(frame)
if frame.dest =~ %r|^/queue|
@@queue_manager.unsubscribe(frame.dest,self)
else
@@topic_manager.unsubscribe(frame.dest,self)
end
end
def begin(frame, trans=nil)
raise "Missing transaction" unless trans
raise "transaction exists" if @transactions.has_key?(trans)
@transactions[trans] = []
end
def commit(frame, trans=nil)
raise "Missing transaction" unless trans
raise "transaction does not exist" unless @transactions.has_key?(trans)
(@transactions[trans]).each do |frame|
frame.headers.delete('transaction')
process_frame(frame)
end
@transactions.delete(trans)
end
def abort(frame, trans=nil)
raise "Missing transaction" unless trans
raise "transaction does not exist" unless @transactions.has_key?(trans)
@transactions.delete(trans)
end
def ack(frame)
@@queue_manager.ack(self, frame)
end
def disconnect(frame)
puts "Polite disconnect" if $DEBUG
close_connection_after_writing
end
def unbind
p "Unbind called" if $DEBUG
@connected = false
@@queue_manager.disconnect(self)
@@topic_manager.disconnect(self)
end
def connected?
@connected
end
def send_message(msg)
msg.command = "MESSAGE"
stomp_send_data(msg)
end
def send_receipt(id)
send_frame("RECEIPT", { 'receipt-id' => id})
end
def send_error(msg)
send_frame("ERROR",{'message' => 'See below'},msg)
end
def stomp_send_data(frame)
send_data(frame.to_s)
puts "Sending frame #{frame.to_s}" if $DEBUG
end
def send_frame(command, headers={}, body='')
headers['content-length'] = body.size.to_s
response = StompServer::StompFrame.new(command, headers, body)
stomp_send_data(response)
end
end
end
end
|
