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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Utilities for Twisted.names tests.
"""
from __future__ import division, absolute_import
from random import randrange
from zope.interface import implementer
from zope.interface.verify import verifyClass
from twisted.internet.address import IPv4Address
from twisted.internet.defer import succeed
from twisted.internet.task import Clock
from twisted.internet.interfaces import IReactorUDP, IUDPTransport
@implementer(IUDPTransport)
class MemoryDatagramTransport(object):
"""
This L{IUDPTransport} implementation enforces the usual connection rules
and captures sent traffic in a list for later inspection.
@ivar _host: The host address to which this transport is bound.
@ivar _protocol: The protocol connected to this transport.
@ivar _sentPackets: A C{list} of two-tuples of the datagrams passed to
C{write} and the addresses to which they are destined.
@ivar _connectedTo: L{None} if this transport is unconnected, otherwise an
address to which all traffic is supposedly sent.
@ivar _maxPacketSize: An C{int} giving the maximum length of a datagram
which will be successfully handled by C{write}.
"""
def __init__(self, host, protocol, maxPacketSize):
self._host = host
self._protocol = protocol
self._sentPackets = []
self._connectedTo = None
self._maxPacketSize = maxPacketSize
def getHost(self):
"""
Return the address which this transport is pretending to be bound
to.
"""
return IPv4Address('UDP', *self._host)
def connect(self, host, port):
"""
Connect this transport to the given address.
"""
if self._connectedTo is not None:
raise ValueError("Already connected")
self._connectedTo = (host, port)
def write(self, datagram, addr=None):
"""
Send the given datagram.
"""
if addr is None:
addr = self._connectedTo
if addr is None:
raise ValueError("Need an address")
if len(datagram) > self._maxPacketSize:
raise ValueError("Packet too big")
self._sentPackets.append((datagram, addr))
def stopListening(self):
"""
Shut down this transport.
"""
self._protocol.stopProtocol()
return succeed(None)
def setBroadcastAllowed(self, enabled):
"""
Dummy implementation to satisfy L{IUDPTransport}.
"""
pass
def getBroadcastAllowed(self):
"""
Dummy implementation to satisfy L{IUDPTransport}.
"""
pass
verifyClass(IUDPTransport, MemoryDatagramTransport)
@implementer(IReactorUDP)
class MemoryReactor(Clock):
"""
An L{IReactorTime} and L{IReactorUDP} provider.
Time is controlled deterministically via the base class, L{Clock}. UDP is
handled in-memory by connecting protocols to instances of
L{MemoryDatagramTransport}.
@ivar udpPorts: A C{dict} mapping port numbers to instances of
L{MemoryDatagramTransport}.
"""
def __init__(self):
Clock.__init__(self)
self.udpPorts = {}
def listenUDP(self, port, protocol, interface='', maxPacketSize=8192):
"""
Pretend to bind a UDP port and connect the given protocol to it.
"""
if port == 0:
while True:
port = randrange(1, 2 ** 16)
if port not in self.udpPorts:
break
if port in self.udpPorts:
raise ValueError("Address in use")
transport = MemoryDatagramTransport(
(interface, port), protocol, maxPacketSize)
self.udpPorts[port] = transport
protocol.makeConnection(transport)
return transport
verifyClass(IReactorUDP, MemoryReactor)
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