1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
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()
|
