179 lines
4.9 KiB
Python
179 lines
4.9 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2018 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import threading
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from io import StringIO
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from mock import NonCallableMock
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from twisted.internet import defer, reactor
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from synapse.util.file_consumer import BackgroundFileConsumer
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from tests import unittest
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class FileConsumerTests(unittest.TestCase):
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@defer.inlineCallbacks
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def test_pull_consumer(self):
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string_file = StringIO()
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consumer = BackgroundFileConsumer(string_file, reactor=reactor)
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try:
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producer = DummyPullProducer()
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yield producer.register_with_consumer(consumer)
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yield producer.write_and_wait("Foo")
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self.assertEqual(string_file.getvalue(), "Foo")
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yield producer.write_and_wait("Bar")
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self.assertEqual(string_file.getvalue(), "FooBar")
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finally:
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consumer.unregisterProducer()
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yield consumer.wait()
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self.assertTrue(string_file.closed)
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@defer.inlineCallbacks
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def test_push_consumer(self):
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string_file = BlockingStringWrite()
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consumer = BackgroundFileConsumer(string_file, reactor=reactor)
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try:
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producer = NonCallableMock(spec_set=[])
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consumer.registerProducer(producer, True)
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consumer.write("Foo")
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yield string_file.wait_for_n_writes(1)
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self.assertEqual(string_file.buffer, "Foo")
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consumer.write("Bar")
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yield string_file.wait_for_n_writes(2)
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self.assertEqual(string_file.buffer, "FooBar")
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finally:
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consumer.unregisterProducer()
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yield consumer.wait()
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self.assertTrue(string_file.closed)
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@defer.inlineCallbacks
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def test_push_producer_feedback(self):
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string_file = BlockingStringWrite()
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consumer = BackgroundFileConsumer(string_file, reactor=reactor)
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try:
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producer = NonCallableMock(spec_set=["pauseProducing", "resumeProducing"])
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resume_deferred = defer.Deferred()
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producer.resumeProducing.side_effect = lambda: resume_deferred.callback(
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None
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)
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consumer.registerProducer(producer, True)
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number_writes = 0
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with string_file.write_lock:
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for _ in range(consumer._PAUSE_ON_QUEUE_SIZE):
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consumer.write("Foo")
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number_writes += 1
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producer.pauseProducing.assert_called_once()
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yield string_file.wait_for_n_writes(number_writes)
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yield resume_deferred
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producer.resumeProducing.assert_called_once()
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finally:
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consumer.unregisterProducer()
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yield consumer.wait()
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self.assertTrue(string_file.closed)
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class DummyPullProducer:
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def __init__(self):
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self.consumer = None
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self.deferred = defer.Deferred()
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def resumeProducing(self):
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d = self.deferred
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self.deferred = defer.Deferred()
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d.callback(None)
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def write_and_wait(self, bytes):
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d = self.deferred
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self.consumer.write(bytes)
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return d
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def register_with_consumer(self, consumer):
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d = self.deferred
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self.consumer = consumer
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self.consumer.registerProducer(self, False)
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return d
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class BlockingStringWrite:
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def __init__(self):
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self.buffer = ""
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self.closed = False
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self.write_lock = threading.Lock()
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self._notify_write_deferred = None
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self._number_of_writes = 0
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def write(self, bytes):
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with self.write_lock:
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self.buffer += bytes
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self._number_of_writes += 1
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reactor.callFromThread(self._notify_write)
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def close(self):
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self.closed = True
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def _notify_write(self):
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"Called by write to indicate a write happened"
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with self.write_lock:
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if not self._notify_write_deferred:
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return
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d = self._notify_write_deferred
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self._notify_write_deferred = None
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d.callback(None)
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@defer.inlineCallbacks
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def wait_for_n_writes(self, n):
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"Wait for n writes to have happened"
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while True:
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with self.write_lock:
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if n <= self._number_of_writes:
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return
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if not self._notify_write_deferred:
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self._notify_write_deferred = defer.Deferred()
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d = self._notify_write_deferred
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yield d
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