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#!/usr/bin/env python
"""
Fake AMQP Redirect - simulate an AMQP server that redirects connections to
another server. A bit ugly, but it's just to test that the client library
actually handles a redirect, without having to have an unbalanced cluster
of real AMQP servers.
2007-12-08 Barry Pederson <bp@barryp.org>
"""
# Copyright (C) 2007-2008 Barry Pederson <bp@barryp.org>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
import socket
import sys
from optparse import OptionParser
from Queue import Queue
import amqplib.client_0_8 as amqp
from amqplib.client_0_8.connection import AMQP_PROTOCOL_HEADER, _MethodReader
from amqplib.client_0_8.serialization import AMQPReader, AMQPWriter
class FakeRedirectConnection(amqp.Connection):
def __init__(self, sock):
self.channels = {}
super(amqp.Connection, self).__init__(self, 0)
self.out = AMQPWriter(sock.makefile('w'))
self.input = AMQPReader(sock.makefile('r'))
self.method_reader = _MethodReader(self.input)
def do_redirect(self, dest):
if self.input.read(8) != AMQP_PROTOCOL_HEADER:
print "Didn't receive AMQP 0-8 header"
return
# major, minor seems backwards, but that's what RabbitMQ sends
self.start(8, 0,
{'product': 'fake_redirect_0_8.py'},
['AMQPLAIN'],
['en_US'])
self.wait(allowed_methods=[
(10, 11), # start_ok
])
self.tune(0, 0, 0)
self.wait(allowed_methods=[
(10, 31), # tune_ok
])
self.wait(allowed_methods=[
(10, 40), # open
])
if self.insist:
self.close(reply_text="Can't redirect, insist was set to True")
else:
self.redirect(dest, '')
try:
self.wait(allowed_methods=[
(10, 60), # close
])
except amqp.AMQPConnectionException:
pass
print 'Redirect finished'
def fake_op(self, args):
"""
We're not really much interested in what the client sends for
start_ok, tune_ok
"""
pass
##############
def _open(self, args):
virtual_host = args.read_shortstr()
capabilities = args.read_shortstr()
self.insist = args.read_bit()
def redirect(self, host, known_hosts):
args = AMQPWriter()
args.write_shortstr(host)
args.write_shortstr(known_hosts)
self._send_channel_method_frame(0, (10, 50), args)
def start(self, version_major, version_minor, server_properties,
mechanisms, locales):
args = AMQPWriter()
args.write_octet(version_major)
args.write_octet(version_minor)
args.write_table(server_properties)
args.write_longstr(' '.join(mechanisms))
args.write_longstr(' '.join(locales))
self._send_channel_method_frame(0, (10, 10), args)
def tune(self, channel_max, frame_max, heartbeat):
args = AMQPWriter()
args.write_short(channel_max)
args.write_long(frame_max)
args.write_short(heartbeat)
self._send_channel_method_frame(0, (10, 30), args)
#
# Monkeypatch the amqplib.client_0_8.Connection _METHOD_MAP dict to
# work with our FakeRedirectConnection
#
amqp.Connection._METHOD_MAP[(10, 11)] = FakeRedirectConnection.fake_op
amqp.Connection._METHOD_MAP[(10, 31)] = FakeRedirectConnection.fake_op
amqp.Connection._METHOD_MAP[(10, 40)] = FakeRedirectConnection._open
def main():
parser = OptionParser(usage='usage: %prog [options]\nexample: %prog --listen=127.0.0.1:5000 --redirect=127.0.0.1:5672')
parser.add_option('--listen', dest='listen',
help='ip:port to listen for an AMQP connection on',
default=None)
parser.add_option('--redirect', dest='redirect',
help='ip:port to redirect AMQP connection to',
default=None)
options, args = parser.parse_args()
if not options.listen or not options.redirect:
parser.print_help()
sys.exit(1)
listen_ip, listen_port = options.listen.split(':', 1)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((listen_ip, int(listen_port)))
print 'listening for connection...'
s.listen(1)
while True:
sock, addr = s.accept()
print 'Accepted connection from', addr
conn = FakeRedirectConnection(sock)
conn.do_redirect(options.redirect)
if __name__ == '__main__':
main()
|
