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Implement a structured logging output system. (#5680)
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Amber Brown
GitHub
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31 changed files with 1328 additions and 82 deletions
234
tests/logging/test_terse_json.py
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234
tests/logging/test_terse_json.py
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# -*- coding: utf-8 -*-
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# Copyright 2019 The Matrix.org Foundation C.I.C.
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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 json
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from collections import Counter
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from twisted.logger import Logger
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from synapse.logging._structured import setup_structured_logging
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from tests.server import connect_client
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from tests.unittest import HomeserverTestCase
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from .test_structured import FakeBeginner
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class TerseJSONTCPTestCase(HomeserverTestCase):
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def test_log_output(self):
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"""
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The Terse JSON outputter delivers simplified structured logs over TCP.
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"""
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log_config = {
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"drains": {
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"tersejson": {
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"type": "network_json_terse",
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"host": "127.0.0.1",
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"port": 8000,
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}
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}
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}
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# Begin the logger with our config
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beginner = FakeBeginner()
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setup_structured_logging(
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self.hs, self.hs.config, log_config, logBeginner=beginner
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)
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logger = Logger(
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namespace="tests.logging.test_terse_json", observer=beginner.observers[0]
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)
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logger.info("Hello there, {name}!", name="wally")
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# Trigger the connection
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self.pump()
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_, server = connect_client(self.reactor, 0)
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# Trigger data being sent
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self.pump()
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# One log message, with a single trailing newline
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logs = server.data.decode("utf8").splitlines()
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self.assertEqual(len(logs), 1)
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self.assertEqual(server.data.count(b"\n"), 1)
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log = json.loads(logs[0])
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# The terse logger should give us these keys.
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expected_log_keys = [
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"log",
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"time",
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"level",
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"log_namespace",
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"request",
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"scope",
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"server_name",
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"name",
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]
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self.assertEqual(set(log.keys()), set(expected_log_keys))
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# It contains the data we expect.
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self.assertEqual(log["name"], "wally")
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def test_log_backpressure_debug(self):
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"""
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When backpressure is hit, DEBUG logs will be shed.
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"""
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log_config = {
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"loggers": {"synapse": {"level": "DEBUG"}},
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"drains": {
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"tersejson": {
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"type": "network_json_terse",
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"host": "127.0.0.1",
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"port": 8000,
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"maximum_buffer": 10,
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}
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},
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}
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# Begin the logger with our config
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beginner = FakeBeginner()
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setup_structured_logging(
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self.hs,
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self.hs.config,
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log_config,
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logBeginner=beginner,
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redirect_stdlib_logging=False,
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)
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logger = Logger(
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namespace="synapse.logging.test_terse_json", observer=beginner.observers[0]
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)
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# Send some debug messages
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for i in range(0, 3):
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logger.debug("debug %s" % (i,))
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# Send a bunch of useful messages
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for i in range(0, 7):
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logger.info("test message %s" % (i,))
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# The last debug message pushes it past the maximum buffer
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logger.debug("too much debug")
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# Allow the reconnection
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_, server = connect_client(self.reactor, 0)
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self.pump()
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# Only the 7 infos made it through, the debugs were elided
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logs = server.data.splitlines()
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self.assertEqual(len(logs), 7)
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def test_log_backpressure_info(self):
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"""
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When backpressure is hit, DEBUG and INFO logs will be shed.
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"""
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log_config = {
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"loggers": {"synapse": {"level": "DEBUG"}},
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"drains": {
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"tersejson": {
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"type": "network_json_terse",
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"host": "127.0.0.1",
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"port": 8000,
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"maximum_buffer": 10,
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}
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},
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}
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# Begin the logger with our config
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beginner = FakeBeginner()
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setup_structured_logging(
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self.hs,
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self.hs.config,
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log_config,
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logBeginner=beginner,
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redirect_stdlib_logging=False,
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)
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logger = Logger(
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namespace="synapse.logging.test_terse_json", observer=beginner.observers[0]
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)
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# Send some debug messages
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for i in range(0, 3):
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logger.debug("debug %s" % (i,))
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# Send a bunch of useful messages
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for i in range(0, 10):
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logger.warn("test warn %s" % (i,))
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# Send a bunch of info messages
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for i in range(0, 3):
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logger.info("test message %s" % (i,))
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# The last debug message pushes it past the maximum buffer
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logger.debug("too much debug")
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# Allow the reconnection
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client, server = connect_client(self.reactor, 0)
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self.pump()
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# The 10 warnings made it through, the debugs and infos were elided
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logs = list(map(json.loads, server.data.decode("utf8").splitlines()))
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self.assertEqual(len(logs), 10)
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self.assertEqual(Counter([x["level"] for x in logs]), {"WARN": 10})
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def test_log_backpressure_cut_middle(self):
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"""
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When backpressure is hit, and no more DEBUG and INFOs cannot be culled,
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it will cut the middle messages out.
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"""
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log_config = {
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"loggers": {"synapse": {"level": "DEBUG"}},
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"drains": {
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"tersejson": {
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"type": "network_json_terse",
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"host": "127.0.0.1",
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"port": 8000,
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"maximum_buffer": 10,
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}
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},
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}
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# Begin the logger with our config
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beginner = FakeBeginner()
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setup_structured_logging(
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self.hs,
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self.hs.config,
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log_config,
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logBeginner=beginner,
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redirect_stdlib_logging=False,
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)
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logger = Logger(
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namespace="synapse.logging.test_terse_json", observer=beginner.observers[0]
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)
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# Send a bunch of useful messages
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for i in range(0, 20):
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logger.warn("test warn", num=i)
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# Allow the reconnection
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client, server = connect_client(self.reactor, 0)
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self.pump()
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# The first five and last five warnings made it through, the debugs and
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# infos were elided
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logs = list(map(json.loads, server.data.decode("utf8").splitlines()))
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self.assertEqual(len(logs), 10)
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self.assertEqual(Counter([x["level"] for x in logs]), {"WARN": 10})
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self.assertEqual([0, 1, 2, 3, 4, 15, 16, 17, 18, 19], [x["num"] for x in logs])
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