###############################################################################
#
# The MIT License (MIT)
#
# Copyright (c) Crossbar.io Technologies GmbH
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# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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import txaio
txaio.use_twisted()
from twisted.python import usage
from twisted.internet.defer import inlineCallbacks
from twisted.internet.protocol import Factory, Protocol
from twisted.internet.endpoints import clientFromString, serverFromString
from twisted.application import service
[docs]class DestEndpointForwardingProtocol(Protocol):
log = txaio.make_logger()
[docs] def connectionMade(self):
self.log.debug("DestEndpointForwardingProtocol.connectionMade")
pass
[docs] def dataReceived(self, data):
self.log.debug(
"DestEndpointForwardingProtocol.dataReceived: {data}",
data=data,
)
if self.factory._sourceProtocol:
self.factory._sourceProtocol.transport.write(data)
[docs] def connectionLost(self, reason):
self.log.debug("DestEndpointForwardingProtocol.connectionLost")
if self.factory._sourceProtocol:
self.factory._sourceProtocol.transport.loseConnection()
[docs]class DestEndpointForwardingFactory(Factory):
def __init__(self, sourceProtocol):
self._sourceProtocol = sourceProtocol
self._proto = None
[docs] def buildProtocol(self, addr):
self._proto = DestEndpointForwardingProtocol()
self._proto.factory = self
return self._proto
[docs]class EndpointForwardingProtocol(Protocol):
log = txaio.make_logger()
[docs] @inlineCallbacks
def connectionMade(self):
self.log.debug("EndpointForwardingProtocol.connectionMade")
self._destFactory = DestEndpointForwardingFactory(self)
self._destEndpoint = clientFromString(self.factory.service._reactor,
self.factory.service._destEndpointDescriptor)
self._destEndpointPort = yield self._destEndpoint.connect(self._destFactory)
[docs] def dataReceived(self, data):
self.log.debug(
"EndpointForwardingProtocol.dataReceived: {data}",
data=data,
)
if self._destFactory._proto:
self._destFactory._proto.transport.write(data)
[docs] def connectionLost(self, reason):
self.log.debug("EndpointForwardingProtocol.connectionLost")
if self._destFactory._proto:
self._destFactory._proto.transport.loseConnection()
[docs]class EndpointForwardingService(service.Service):
def __init__(self, endpointDescriptor, destEndpointDescriptor, reactor=None):
if reactor is None:
from twisted.internet import reactor
self._reactor = reactor
self._endpointDescriptor = endpointDescriptor
self._destEndpointDescriptor = destEndpointDescriptor
[docs] @inlineCallbacks
def startService(self):
factory = Factory.forProtocol(EndpointForwardingProtocol)
factory.service = self
self._endpoint = serverFromString(self._reactor, self._endpointDescriptor)
self._endpointPort = yield self._endpoint.listen(factory)
[docs] def stopService(self):
return self._endpointPort.stopListening()
[docs]class Options(usage.Options):
synopsis = "[options]"
longdesc = 'Endpoint Forwarder.'
optParameters = [
["endpoint", "e", None, "Source endpoint."],
["dest_endpoint", "d", None, "Destination endpoint."]
]
[docs]def makeService(config):
service = EndpointForwardingService(config['endpoint'], config['dest_endpoint'])
return service