Current File : //lib/python3/dist-packages/twisted/test/test_tpfile.py
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
from io import BytesIO
from twisted.internet import abstract, defer, protocol
from twisted.protocols import basic, loopback
from twisted.trial import unittest
class BufferingServer(protocol.Protocol):
buffer = b""
def dataReceived(self, data: bytes) -> None:
self.buffer += data
class FileSendingClient(protocol.Protocol):
def __init__(self, f: BytesIO) -> None:
self.f = f
def connectionMade(self) -> None:
assert self.transport is not None
s = basic.FileSender()
d = s.beginFileTransfer(self.f, self.transport, lambda x: x)
d.addCallback(lambda r: self.transport.loseConnection())
class FileSenderTests(unittest.TestCase):
def testSendingFile(self) -> defer.Deferred[None]:
testStr = b"xyz" * 100 + b"abc" * 100 + b"123" * 100
s = BufferingServer()
c = FileSendingClient(BytesIO(testStr))
d: defer.Deferred[None] = loopback.loopbackTCP(s, c)
def callback(x: object) -> None:
self.assertEqual(s.buffer, testStr)
return d.addCallback(callback)
def testSendingEmptyFile(self) -> None:
fileSender = basic.FileSender()
consumer = abstract.FileDescriptor()
consumer.connected = 1
emptyFile = BytesIO(b"")
d = fileSender.beginFileTransfer(emptyFile, consumer, lambda x: x)
# The producer will be immediately exhausted, and so immediately
# unregistered
self.assertIsNone(consumer.producer)
# Which means the Deferred from FileSender should have been called
self.assertTrue(d.called, "producer unregistered with deferred being called")
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