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# -*- test-case-name: twisted.test.test_stringtransport -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Assorted functionality which is commonly useful when writing unit tests.
"""
from StringIO import StringIO
from zope.interface import implements
from twisted.internet.interfaces import ITransport, IConsumer, IPushProducer,\
IConnector
from twisted.internet.interfaces import IReactorTCP, IReactorSSL, IReactorUNIX
from twisted.internet.interfaces import IListeningPort
from twisted.protocols import basic
from twisted.internet import protocol, error, address
from twisted.internet.address import IPv4Address, UNIXAddress
class AccumulatingProtocol(protocol.Protocol):
"""
L{AccumulatingProtocol} is an L{IProtocol} implementation which collects
the data delivered to it and can fire a Deferred when it is connected or
disconnected.
@ivar made: A flag indicating whether C{connectionMade} has been called.
@ivar data: A string giving all the data passed to C{dataReceived}.
@ivar closed: A flag indicated whether C{connectionLost} has been called.
@ivar closedReason: The value of the I{reason} parameter passed to
C{connectionLost}.
@ivar closedDeferred: If set to a L{Deferred}, this will be fired when
C{connectionLost} is called.
"""
made = closed = 0
closedReason = None
closedDeferred = None
data = ""
factory = None
def connectionMade(self):
self.made = 1
if (self.factory is not None and
self.factory.protocolConnectionMade is not None):
d = self.factory.protocolConnectionMade
self.factory.protocolConnectionMade = None
d.callback(self)
def dataReceived(self, data):
self.data += data
def connectionLost(self, reason):
self.closed = 1
self.closedReason = reason
if self.closedDeferred is not None:
d, self.closedDeferred = self.closedDeferred, None
d.callback(None)
class LineSendingProtocol(basic.LineReceiver):
lostConn = False
def __init__(self, lines, start = True):
self.lines = lines[:]
self.response = []
self.start = start
def connectionMade(self):
if self.start:
map(self.sendLine, self.lines)
def lineReceived(self, line):
if not self.start:
map(self.sendLine, self.lines)
self.lines = []
self.response.append(line)
def connectionLost(self, reason):
self.lostConn = True
class FakeDatagramTransport:
noAddr = object()
def __init__(self):
self.written = []
def write(self, packet, addr=noAddr):
self.written.append((packet, addr))
class StringTransport:
"""
A transport implementation which buffers data in memory and keeps track of
its other state without providing any behavior.
L{StringTransport} has a number of attributes which are not part of any of
the interfaces it claims to implement. These attributes are provided for
testing purposes. Implementation code should not use any of these
attributes; they are not provided by other transports.
@ivar disconnecting: A C{bool} which is C{False} until L{loseConnection} is
called, then C{True}.
@ivar producer: If a producer is currently registered, C{producer} is a
reference to it. Otherwise, C{None}.
@ivar streaming: If a producer is currently registered, C{streaming} refers
to the value of the second parameter passed to C{registerProducer}.
@ivar hostAddr: C{None} or an object which will be returned as the host
address of this transport. If C{None}, a nasty tuple will be returned
instead.
@ivar peerAddr: C{None} or an object which will be returned as the peer
address of this transport. If C{None}, a nasty tuple will be returned
instead.
@ivar producerState: The state of this L{StringTransport} in its capacity
as an L{IPushProducer}. One of C{'producing'}, C{'paused'}, or
C{'stopped'}.
@ivar io: A L{StringIO} which holds the data which has been written to this
transport since the last call to L{clear}. Use L{value} instead of
accessing this directly.
"""
implements(ITransport, IConsumer, IPushProducer)
disconnecting = False
producer = None
streaming = None
hostAddr = None
peerAddr = None
producerState = 'producing'
def __init__(self, hostAddress=None, peerAddress=None):
self.clear()
if hostAddress is not None:
self.hostAddr = hostAddress
if peerAddress is not None:
self.peerAddr = peerAddress
self.connected = True
def clear(self):
"""
Discard all data written to this transport so far.
This is not a transport method. It is intended for tests. Do not use
it in implementation code.
"""
self.io = StringIO()
def value(self):
"""
Retrieve all data which has been buffered by this transport.
This is not a transport method. It is intended for tests. Do not use
it in implementation code.
@return: A C{str} giving all data written to this transport since the
last call to L{clear}.
@rtype: C{str}
"""
return self.io.getvalue()
# ITransport
def write(self, data):
if isinstance(data, unicode): # no, really, I mean it
raise TypeError("Data must not be unicode")
self.io.write(data)
def writeSequence(self, data):
self.io.write(''.join(data))
def loseConnection(self):
"""
Close the connection. Does nothing besides toggle the C{disconnecting}
instance variable to C{True}.
"""
self.disconnecting = True
def getPeer(self):
if self.peerAddr is None:
return address.IPv4Address('TCP', '192.168.1.1', 54321)
return self.peerAddr
def getHost(self):
if self.hostAddr is None:
return address.IPv4Address('TCP', '10.0.0.1', 12345)
return self.hostAddr
# IConsumer
def registerProducer(self, producer, streaming):
if self.producer is not None:
raise RuntimeError("Cannot register two producers")
self.producer = producer
self.streaming = streaming
def unregisterProducer(self):
if self.producer is None:
raise RuntimeError(
"Cannot unregister a producer unless one is registered")
self.producer = None
self.streaming = None
# IPushProducer
def _checkState(self):
if self.disconnecting:
raise RuntimeError(
"Cannot resume producing after loseConnection")
if self.producerState == 'stopped':
raise RuntimeError("Cannot resume a stopped producer")
def pauseProducing(self):
self._checkState()
self.producerState = 'paused'
def stopProducing(self):
self.producerState = 'stopped'
def resumeProducing(self):
self._checkState()
self.producerState = 'producing'
class StringTransportWithDisconnection(StringTransport):
def loseConnection(self):
if self.connected:
self.connected = False
self.protocol.connectionLost(error.ConnectionDone("Bye."))
class StringIOWithoutClosing(StringIO):
"""
A StringIO that can't be closed.
"""
def close(self):
"""
Do nothing.
"""
class _FakePort(object):
"""
A fake L{IListeningPort} to be used in tests.
@ivar _hostAddress: The L{IAddress} this L{IListeningPort} is pretending
to be listening on.
"""
implements(IListeningPort)
def __init__(self, hostAddress):
"""
@param hostAddress: An L{IAddress} this L{IListeningPort} should
pretend to be listening on.
"""
self._hostAddress = hostAddress
def startListening(self):
"""
Fake L{IListeningPort.startListening} that doesn't do anything.
"""
def stopListening(self):
"""
Fake L{IListeningPort.stopListening} that doesn't do anything.
"""
def getHost(self):
"""
Fake L{IListeningPort.getHost} that returns our L{IAddress}.
"""
return self._hostAddress
class _FakeConnector(object):
"""
A fake L{IConnector} that allows us to inspect if it has been told to stop
connecting.
@ivar stoppedConnecting: has this connector's
L{FakeConnector.stopConnecting} method been invoked yet?
@ivar _address: An L{IAddress} provider that represents our destination.
"""
implements(IConnector)
stoppedConnecting = False
def __init__(self, address):
"""
@param address: An L{IAddress} provider that represents this
connector's destination.
"""
self._address = address
def stopConnecting(self):
"""
Implement L{IConnector.stopConnecting} and set
L{FakeConnector.stoppedConnecting} to C{True}
"""
self.stoppedConnecting = True
def disconnect(self):
"""
Implement L{IConnector.disconnect} as a no-op.
"""
def connect(self):
"""
Implement L{IConnector.connect} as a no-op.
"""
def getDestination(self):
"""
Implement L{IConnector.getDestination} to return the C{address} passed
to C{__init__}.
"""
return self._address
class MemoryReactor(object):
"""
A fake reactor to be used in tests. This reactor doesn't actually do
much that's useful yet. It accepts TCP connection setup attempts, but
they will never succeed.
@ivar tcpClients: a list that keeps track of connection attempts (ie, calls
to C{connectTCP}).
@type tcpClients: C{list}
@ivar tcpServers: a list that keeps track of server listen attempts (ie, calls
to C{listenTCP}).
@type tcpServers: C{list}
@ivar sslClients: a list that keeps track of connection attempts (ie,
calls to C{connectSSL}).
@type sslClients: C{list}
@ivar sslServers: a list that keeps track of server listen attempts (ie,
calls to C{listenSSL}).
@type sslServers: C{list}
@ivar unixClients: a list that keeps track of connection attempts (ie,
calls to C{connectUNIX}).
@type unixClients: C{list}
@ivar unixServers: a list that keeps track of server listen attempts (ie,
calls to C{listenUNIX}).
@type unixServers: C{list}
"""
implements(IReactorTCP, IReactorSSL, IReactorUNIX)
def __init__(self):
"""
Initialize the tracking lists.
"""
self.tcpClients = []
self.tcpServers = []
self.sslClients = []
self.sslServers = []
self.unixClients = []
self.unixServers = []
def listenTCP(self, port, factory, backlog=50, interface=''):
"""
Fake L{reactor.listenTCP}, that logs the call and returns an
L{IListeningPort}.
"""
self.tcpServers.append((port, factory, backlog, interface))
return _FakePort(IPv4Address('TCP', '0.0.0.0', port))
def connectTCP(self, host, port, factory, timeout=30, bindAddress=None):
"""
Fake L{reactor.connectTCP}, that logs the call and returns an
L{IConnector}.
"""
self.tcpClients.append((host, port, factory, timeout, bindAddress))
return _FakeConnector(IPv4Address('TCP', host, port))
def listenSSL(self, port, factory, contextFactory,
backlog=50, interface=''):
"""
Fake L{reactor.listenSSL}, that logs the call and returns an
L{IListeningPort}.
"""
self.sslServers.append((port, factory, contextFactory,
backlog, interface))
return _FakePort(IPv4Address('TCP', '0.0.0.0', port))
def connectSSL(self, host, port, factory, contextFactory,
timeout=30, bindAddress=None):
"""
Fake L{reactor.connectSSL}, that logs the call and returns an
L{IConnector}.
"""
self.sslClients.append((host, port, factory, contextFactory,
timeout, bindAddress))
return _FakeConnector(IPv4Address('TCP', host, port))
def listenUNIX(self, address, factory,
backlog=50, mode=0666, wantPID=0):
"""
Fake L{reactor.listenUNIX}, that logs the call and returns an
L{IListeningPort}.
"""
self.unixServers.append((address, factory, backlog, mode, wantPID))
return _FakePort(UNIXAddress(address))
def connectUNIX(self, address, factory, timeout=30, checkPID=0):
"""
Fake L{reactor.connectUNIX}, that logs the call and returns an
L{IConnector}.
"""
self.unixClients.append((address, factory, timeout, checkPID))
return _FakeConnector(UNIXAddress(address))
class RaisingMemoryReactor(object):
"""
A fake reactor to be used in tests. It accepts TCP connection setup
attempts, but they will fail.
@ivar _listenException: An instance of an L{Exception}
@ivar _connectException: An instance of an L{Exception}
"""
implements(IReactorTCP, IReactorSSL, IReactorUNIX)
def __init__(self, listenException=None, connectException=None):
"""
@param listenException: An instance of an L{Exception} to raise when any
C{listen} method is called.
@param connectException: An instance of an L{Exception} to raise when
any C{connect} method is called.
"""
self._listenException = listenException
self._connectException = connectException
def listenTCP(self, port, factory, backlog=50, interface=''):
"""
Fake L{reactor.listenTCP}, that raises L{self._listenException}.
"""
raise self._listenException
def connectTCP(self, host, port, factory, timeout=30, bindAddress=None):
"""
Fake L{reactor.connectTCP}, that raises L{self._connectException}.
"""
raise self._connectException
def listenSSL(self, port, factory, contextFactory,
backlog=50, interface=''):
"""
Fake L{reactor.listenSSL}, that raises L{self._listenException}.
"""
raise self._listenException
def connectSSL(self, host, port, factory, contextFactory,
timeout=30, bindAddress=None):
"""
Fake L{reactor.connectSSL}, that raises L{self._connectException}.
"""
raise self._connectException
def listenUNIX(self, address, factory,
backlog=50, mode=0666, wantPID=0):
"""
Fake L{reactor.listenUNIX}, that raises L{self._listenException}.
"""
raise self._listenException
def connectUNIX(self, address, factory, timeout=30, checkPID=0):
"""
Fake L{reactor.connectUNIX}, that raises L{self._connectException}.
"""
raise self._connectException