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broker.py
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broker.py
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__author__ = 'Fede M'
import json
try:
from twisted.internet import epollreactor
epollreactor.install()
except:
try:
from twisted.internet import iocpreactor
iocpreactor.install()
except:
from twisted.internet import selectreactor
selectreactor.install()
from pubsub import PubProtocol
from twisted.internet import reactor, protocol, endpoints
from twisted.protocols import basic
from twisted.internet.protocol import ReconnectingClientFactory
from twisted.python import log
from twisted.python.logfile import DailyLogFile
from twisted.logger import Logger, textFileLogObserver
logfile = DailyLogFile.fromFullPath("broker.log")
log.startLogging(logfile)
log = Logger(observer=textFileLogObserver(logfile))
class BrokerPubProtocol(PubProtocol):
def __init__(self, factory, serializer=json):
self.factory = factory
self.uids =set()
self.serializer = json
def connectionLost(self, reason):
self._clean_uids()
self.factory.refresh_uids()
def _unsupported_messages(self):
return ("to", "command", )
def process_new_subscription(self):
self.factory.refresh_uids()
def lineReceived(self, line):
try:
data = self.serializer.loads(line.rstrip())
for each in self._unsupported_messages():
if each in data:
log.error("Unsupported message {message!r}", message = line.rstrip())
self.transport.abortConnection()
self.process_line_data(data, line)
except Exception, e:
log.failure(e.message)
self.transport.abortConnection()
from collections import defaultdict
from twisted.internet.endpoints import TCP4ClientEndpoint
class BrokerPubFactory(protocol.Factory):
def __init__(self, ip, port, serializer=json):
self.clients = defaultdict(lambda: set())
self.uids = set()
self.subscriber = None
self.thread = None
self.ip = ip
self.port = port
self.defer = None
self.subfactory = SubscriberClientFactory(self, serializer)
self.secs_to_wait = 0.5
self.suscribe()
self.waiting_acks = {}
self.conversation_callbacks = {}
self.serializer = serializer
def refresh_uids(self):
self.uids = set(self.clients.keys())
if self.subscriber is None:
self.suscribe()
else:
self.subscriber.set_uids(self.uids)
def suscribe(self):
if self.defer is None:
point = TCP4ClientEndpoint(reactor, self.ip, self.port)
self.defer = point.connect(self.subfactory)
self.defer.addCallback(self.set_suscriber)
self.defer.addErrback(self.connection_failed)
def connection_lost(self):
log.warn("Connection lost")
self.subscriber = None
reactor.callLater(self.secs_to_wait, self.suscribe)
def connection_failed(self, reason):
log.error("Connection failed: %s" % (reason,))
self.defer = None
self.secs_to_wait = 10 if self.secs_to_wait >= 10 else self.secs_to_wait * 2
self.connection_lost()
def set_suscriber(self, p):
self.subscriber = p
self.defer = None
self.subscriber.set_uids(self.uids)
def send_uid_no_registered(self):
data = {'ack': 0, 'error': 'uid not registered'}
self.subscriber.sendLine(self.serializer.dumps(data))
def new_message(self, data):
if "uid_to" in data:
uid_to = data["uid_to"]
clients = self.clients.get(uid_to)
uid_conversation = data['uid_conversation']
if clients:
self.waiting_acks[uid_conversation] = {"clients": clients, "channel": self.subscriber}
data = self.serializer.dumps({'uid_to': uid_to, 'uid_conversation': uid_conversation})
for client in clients:
try:
log.debug('Going to send message for uid %s in conversation %s' % (uid_to, uid_conversation,))
client.sendLine(data)
except Exception, e:
log.failure("ERROR in new_message: {message!r}", message=e.message)
client.transport.loseConnection()
callback = reactor.callLater(1.7, BrokerPubProtocol.no_ack_timeout, self, self.subscriber, uid_conversation, uid_to)
self.conversation_callbacks[uid_conversation] = callback
else:
self.send_uid_no_registered()
def close_all(self):
for each in self.clients.values():
for client in each:
client.transport.loseConnection()
self.subscriber = None
def buildProtocol(self, addr):
return BrokerPubProtocol(self)
class Subscriber(basic.LineReceiver):
def __init__(self, broker, serializer):
self.broker = broker
self.uids = []
self.registered = False
self.serializer = serializer
def lineReceived(self, line):
data = self.serializer.loads(line.rstrip())
self.broker.new_message(data)
def set_uids(self, uids):
self.uids = uids
self.registered = False
self.register()
def register(self):
d = self.serializer.dumps({"uids": list(self.uids)})
x = self.sendLine(d)
if x:
self.registered = True
def connectionLost(self, reason):
self.broker.connection_lost()
class SubscriberClientFactory(ReconnectingClientFactory):
def __init__(self, broker, serializer=json):
self.broker = broker
self.serializer = serializer
def buildProtocol(self, addr):
s = Subscriber(self.broker, self.serializer)
s.factory = self
return s
if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser(description='Starts a new pubsub broker hub for the ping protocol')
parser.add_argument('--port', metavar='P', type=int,
help='Port to listen', default=1026)
parser.add_argument('--ip', dest='ip',
help='ip to listen', default="127.0.0.1")
parser.add_argument('--dest_port', type=int,
help='Port to connect', default=1025)
parser.add_argument('--dest_ip', dest='dest_ip',
help='ip to connect', default="127.0.0.1")
args = parser.parse_args()
endpoints.serverFromString(reactor, "tcp:interface=%s:port=%s" % (args.ip, args.port)).listen(BrokerPubFactory(args.dest_ip, args.dest_port))
reactor.run()