/usr/lib/python2.7/dist-packages/twext/internet/tcp.py is in calendarserver 5.2+dfsg-1.
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# Copyright (c) 2005-2014 Apple Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##
"""
Extentions to twisted.internet.tcp.
"""
__all__ = [
"MaxAcceptTCPServer",
"MaxAcceptSSLServer",
]
import socket
from OpenSSL import SSL
from twisted.application import internet
from twisted.internet import tcp, ssl
from twisted.internet.defer import succeed
from twext.python.log import Logger
log = Logger()
class MaxAcceptPortMixin(object):
"""
Mixin for resetting maxAccepts.
"""
def doRead(self):
self.numberAccepts = min(
self.factory.maxRequests - self.factory.outstandingRequests,
self.factory.maxAccepts
)
tcp.Port.doRead(self)
class MaxAcceptTCPPort(MaxAcceptPortMixin, tcp.Port):
"""
Use for non-inheriting tcp ports.
"""
class MaxAcceptSSLPort(MaxAcceptPortMixin, ssl.Port):
"""
Use for non-inheriting SSL ports.
"""
class InheritedTCPPort(MaxAcceptTCPPort):
"""
A tcp port which uses an inherited file descriptor.
"""
def __init__(self, fd, factory, reactor):
tcp.Port.__init__(self, 0, factory, reactor=reactor)
# MOR: careful because fromfd dup()'s the socket, so we need to
# make sure we don't leak file descriptors
self.socket = socket.fromfd(fd, socket.AF_INET, socket.SOCK_STREAM)
self._realPortNumber = self.port = self.socket.getsockname()[1]
def createInternetSocket(self):
return self.socket
def startListening(self):
log.info("%s starting on %s" % (self.factory.__class__, self._realPortNumber))
self.factory.doStart()
self.connected = 1
self.fileno = self.socket.fileno
self.numberAccepts = self.factory.maxRequests
self.startReading()
class InheritedSSLPort(InheritedTCPPort):
"""
An SSL port which uses an inherited file descriptor.
"""
_socketShutdownMethod = 'sock_shutdown'
transport = ssl.Server
def __init__(self, fd, factory, ctxFactory, reactor):
InheritedTCPPort.__init__(self, fd, factory, reactor)
self.ctxFactory = ctxFactory
self.socket = SSL.Connection(self.ctxFactory.getContext(), self.socket)
def _preMakeConnection(self, transport):
transport._startTLS()
return tcp.Port._preMakeConnection(self, transport)
def _allConnectionsClosed(protocolFactory):
"""
Check to see if protocolFactory implements allConnectionsClosed( ) and
if so, call it. Otherwise, return immediately.
This allows graceful shutdown by waiting for all requests to be completed.
@param protocolFactory: (usually) an HTTPFactory implementing allConnectionsClosed
which returns a Deferred which fires when all connections are closed.
@return: A Deferred firing None when all connections are closed, or immediately
if the given factory does not track its connections (e.g.
InheritingProtocolFactory)
"""
if hasattr(protocolFactory, "allConnectionsClosed"):
return protocolFactory.allConnectionsClosed()
return succeed(None)
class MaxAcceptTCPServer(internet.TCPServer):
"""
TCP server which will uses MaxAcceptTCPPorts (and optionally,
inherited ports)
@ivar myPort: When running, this is set to the L{IListeningPort} being
managed by this service.
"""
def __init__(self, *args, **kwargs):
internet.TCPServer.__init__(self, *args, **kwargs)
self.protocolFactory = self.args[1]
self.protocolFactory.myServer = self
self.inherit = self.kwargs.get("inherit", False)
self.backlog = self.kwargs.get("backlog", None)
self.interface = self.kwargs.get("interface", None)
def _getPort(self):
from twisted.internet import reactor
if self.inherit:
port = InheritedTCPPort(self.args[0], self.args[1], reactor)
else:
port = MaxAcceptTCPPort(self.args[0], self.args[1], self.backlog, self.interface, reactor)
port.startListening()
self.myPort = port
return port
def stopService(self):
"""
Wait for outstanding requests to finish
@return: a Deferred which fires when all outstanding requests are complete
"""
internet.TCPServer.stopService(self)
return _allConnectionsClosed(self.protocolFactory)
class MaxAcceptSSLServer(internet.SSLServer):
"""
SSL server which will uses MaxAcceptSSLPorts (and optionally,
inherited ports)
"""
def __init__(self, *args, **kwargs):
internet.SSLServer.__init__(self, *args, **kwargs)
self.protocolFactory = self.args[1]
self.protocolFactory.myServer = self
self.inherit = self.kwargs.get("inherit", False)
self.backlog = self.kwargs.get("backlog", None)
self.interface = self.kwargs.get("interface", None)
def _getPort(self):
from twisted.internet import reactor
if self.inherit:
port = InheritedSSLPort(self.args[0], self.args[1], self.args[2], reactor)
else:
port = MaxAcceptSSLPort(self.args[0], self.args[1], self.args[2], self.backlog, self.interface, self.reactor)
port.startListening()
self.myPort = port
return port
def stopService(self):
"""
Wait for outstanding requests to finish
@return: a Deferred which fires when all outstanding requests are complete
"""
internet.SSLServer.stopService(self)
# TODO: check for an ICompletionWaiter interface
return _allConnectionsClosed(self.protocolFactory)
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