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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
from typing import Tuple
from twisted.internet.protocol import Protocol
from twisted.test.proto_helpers import AccumulatingProtocol, MemoryReactorClock
from synapse.logging import RemoteHandler
from tests.logging import LoggerCleanupMixin
from tests.server import FakeTransport, get_clock
from tests.unittest import TestCase
from tests.utils import checked_cast
def connect_logging_client(
reactor: MemoryReactorClock, client_id: int
) -> Tuple[Protocol, AccumulatingProtocol]:
# This is essentially tests.server.connect_client, but disabling autoflush on
# the client transport. This is necessary to avoid an infinite loop due to
# sending of data via the logging transport causing additional logs to be
# written.
factory = reactor.tcpClients.pop(client_id)[2]
client = factory.buildProtocol(None)
server = AccumulatingProtocol()
server.makeConnection(FakeTransport(client, reactor))
client.makeConnection(FakeTransport(server, reactor, autoflush=False))
return client, server
class RemoteHandlerTestCase(LoggerCleanupMixin, TestCase):
def setUp(self) -> None:
self.reactor, _ = get_clock()
def test_log_output(self) -> None:
"""
The remote handler delivers logs over TCP.
"""
handler = RemoteHandler("127.0.0.1", 9000, _reactor=self.reactor)
logger = self.get_logger(handler)
logger.info("Hello there, %s!", "wally")
# Trigger the connection
client, server = connect_logging_client(self.reactor, 0)
# Trigger data being sent
client_transport = checked_cast(FakeTransport, client.transport)
client_transport.flush()
# One log message, with a single trailing newline
logs = server.data.decode("utf8").splitlines()
self.assertEqual(len(logs), 1)
self.assertEqual(server.data.count(b"\n"), 1)
# Ensure the data passed through properly.
self.assertEqual(logs[0], "Hello there, wally!")
def test_log_backpressure_debug(self) -> None:
"""
When backpressure is hit, DEBUG logs will be shed.
"""
handler = RemoteHandler(
"127.0.0.1", 9000, maximum_buffer=10, _reactor=self.reactor
)
logger = self.get_logger(handler)
# Send some debug messages
for i in range(3):
logger.debug("debug %s" % (i,))
# Send a bunch of useful messages
for i in range(7):
logger.info("info %s" % (i,))
# The last debug message pushes it past the maximum buffer
logger.debug("too much debug")
# Allow the reconnection
client, server = connect_logging_client(self.reactor, 0)
client_transport = checked_cast(FakeTransport, client.transport)
client_transport.flush()
# Only the 7 infos made it through, the debugs were elided
logs = server.data.splitlines()
self.assertEqual(len(logs), 7)
self.assertNotIn(b"debug", server.data)
def test_log_backpressure_info(self) -> None:
"""
When backpressure is hit, DEBUG and INFO logs will be shed.
"""
handler = RemoteHandler(
"127.0.0.1", 9000, maximum_buffer=10, _reactor=self.reactor
)
logger = self.get_logger(handler)
# Send some debug messages
for i in range(3):
logger.debug("debug %s" % (i,))
# Send a bunch of useful messages
for i in range(10):
logger.warning("warn %s" % (i,))
# Send a bunch of info messages
for i in range(3):
logger.info("info %s" % (i,))
# The last debug message pushes it past the maximum buffer
logger.debug("too much debug")
# Allow the reconnection
client, server = connect_logging_client(self.reactor, 0)
client_transport = checked_cast(FakeTransport, client.transport)
client_transport.flush()
# The 10 warnings made it through, the debugs and infos were elided
logs = server.data.splitlines()
self.assertEqual(len(logs), 10)
self.assertNotIn(b"debug", server.data)
self.assertNotIn(b"info", server.data)
def test_log_backpressure_cut_middle(self) -> None:
"""
When backpressure is hit, and no more DEBUG and INFOs cannot be culled,
it will cut the middle messages out.
"""
handler = RemoteHandler(
"127.0.0.1", 9000, maximum_buffer=10, _reactor=self.reactor
)
logger = self.get_logger(handler)
# Send a bunch of useful messages
for i in range(20):
logger.warning("warn %s" % (i,))
# Allow the reconnection
client, server = connect_logging_client(self.reactor, 0)
client_transport = checked_cast(FakeTransport, client.transport)
client_transport.flush()
# The first five and last five warnings made it through, the debugs and
# infos were elided
logs = server.data.decode("utf8").splitlines()
self.assertEqual(
["warn %s" % (i,) for i in range(5)]
+ ["warn %s" % (i,) for i in range(15, 20)],
logs,
)
def test_cancel_connection(self) -> None:
"""
Gracefully handle the connection being cancelled.
"""
handler = RemoteHandler(
"127.0.0.1", 9000, maximum_buffer=10, _reactor=self.reactor
)
logger = self.get_logger(handler)
# Send a message.
logger.info("Hello there, %s!", "wally")
# Do not accept the connection and shutdown. This causes the pending
# connection to be cancelled (and should not raise any exceptions).
handler.close()
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