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# Copyright (c) 2012, Christopher Gamble
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the Christopher Gamble nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
from twisted.internet.protocol import Protocol, Factory
from twisted.protocols.policies import ProtocolWrapper
from txsockjs.factory import SockJSResource
from txsockjs import utils
class BroadcastProtocol(Protocol):
def dataReceived(self, data):
self.transport.broadcast(data)
class BroadcastFactory(Factory):
protocol = BroadcastProtocol
class MultiplexProxy(ProtocolWrapper):
def __init__(self, factory, wrappedProtocol, transport, topic):
ProtocolWrapper.__init__(self, factory, wrappedProtocol)
self.topic = topic
self.makeConnection(transport)
def write(self, data):
self.transport.transport.write(",".join(["msg", self.topic, data]))
def writeSequence(self, data):
for d in data:
self.write(d)
def broadcast(self, data):
self.factory.broadcast(self.topic, data)
def loseConnection(self):
self.transport.transport.write(",".join(["uns", self.topic]))
class MultiplexProtocol(Protocol):
def connectionMade(self):
self.factory._connections[self] = {}
def dataReceived(self, message):
type, chaff, topic = message.partition(",")
if "," in topic:
topic, chaff, payload = topic.partition(",")
if type == "sub":
self.factory.subscribe(self, topic)
elif type == "msg":
self.factory.handleMessage(self, topic, payload)
elif type == "uns":
self.factory.unsubscribe(self, topic)
def connectionLost(self, reason=None):
for conn in self.factory._connections[self].values():
conn.connectionLost(reason)
del self.factory._connections[self]
class MultiplexFactory(Factory):
protocol = MultiplexProtocol
def __init__(self, resource):
self._resource = resource
self._topics = {}
self._connections = {}
def addFactory(self, name, factory):
self._topics[name] = factory
def broadcast(self, name, message):
targets = []
message = ",".join(["msg", name, message])
for p, topics in self._connections.items():
if name in topics:
targets.append(p)
utils.broadcast(message, targets)
def removeFactory(self, name, factory):
del self._topics[name]
def subscribe(self, p, name):
if name not in self._topics:
return
self._connections[p][name] = MultiplexProxy(self, self._topics[name].buildProtocol(p.transport.getPeer()), p, name)
def handleMessage(self, p, name, message):
if p not in self._connections:
return
if name not in self._connections[p]:
return
self._connections[p][name].dataReceived(message)
def unsubscribe(self, p, name):
if p not in self._connections:
return
if name not in self._connections[p]:
return
self._connections[p][name].connectionLost(None)
del self._connections[p][name]
def registerProtocol(self, p):
pass
def unregisterProtocol(self, p):
pass
class PubSubFactory(MultiplexFactory):
broadcastFactory = BroadcastFactory()
def subscribe(self, p, name):
if name not in self._topics:
self._topics[name] = self.broadcastFactory
MultiplexFactory.subscribe(self, p, name)
class SockJSMultiplexResource(SockJSResource):
def __init__(self, options=None):
SockJSResource.__init__(self, MultiplexFactory(self), options)
def addFactory(self, name, factory):
return self._factory.addFactory(name, factory)
def broadcast(self, name, message):
return self._factory.broadcast(name, message)
def removeFactory(self, name):
return self._factory.removeFactory(name)
class SockJSPubSubResource(SockJSMultiplexResource):
def __init__(self, options=None):
SockJSResource.__init__(self, PubSubFactory(self), options)