def test_log_backpressure_info(self):
"""
When backpressure is hit, DEBUG and INFO logs will be shed.
"""
log_config = {
"loggers": {
"synapse": {
"level": "DEBUG"
}
},
"drains": {
"tersejson": {
"type": "network_json_terse",
"host": "127.0.0.1",
"port": 8000,
"maximum_buffer": 10,
}
},
}
# Begin the logger with our config
beginner = FakeBeginner()
setup_structured_logging(
self.hs,
self.hs.config,
log_config,
logBeginner=beginner,
redirect_stdlib_logging=False,
)
logger = Logger(namespace="synapse.logging.test_terse_json",
observer=beginner.observers[0])
# Send some debug messages
for i in range(0, 3):
logger.debug("debug %s" % (i, ))
# Send a bunch of useful messages
for i in range(0, 10):
logger.warn("test warn %s" % (i, ))
# Send a bunch of info messages
for i in range(0, 3):
logger.info("test message %s" % (i, ))
# The last debug message pushes it past the maximum buffer
logger.debug("too much debug")
# Allow the reconnection
client, server = connect_client(self.reactor, 0)
self.pump()
# The 10 warnings made it through, the debugs and infos were elided
logs = list(map(json.loads, server.data.decode("utf8").splitlines()))
self.assertEqual(len(logs), 10)
self.assertEqual(Counter([x["level"] for x in logs]), {"WARN": 10})
def test_log_output(self):
"""
The Terse JSON outputter delivers simplified structured logs over TCP.
"""
log_config = {
"drains": {
"tersejson": {
"type": "network_json_terse",
"host": "127.0.0.1",
"port": 8000,
}
}
}
# Begin the logger with our config
beginner = FakeBeginner()
setup_structured_logging(self.hs,
self.hs.config,
log_config,
logBeginner=beginner)
logger = Logger(namespace="tests.logging.test_terse_json",
observer=beginner.observers[0])
logger.info("Hello there, {name}!", name="wally")
# Trigger the connection
self.pump()
_, server = connect_client(self.reactor, 0)
# Trigger data being sent
self.pump()
# 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)
log = json.loads(logs[0])
# The terse logger should give us these keys.
expected_log_keys = [
"log",
"time",
"level",
"log_namespace",
"request",
"scope",
"server_name",
"name",
]
self.assertEqual(set(log.keys()), set(expected_log_keys))
# It contains the data we expect.
self.assertEqual(log["name"], "wally")
def test_log_backpressure_cut_middle(self):
"""
When backpressure is hit, and no more DEBUG and INFOs cannot be culled,
it will cut the middle messages out.
"""
log_config = {
"loggers": {
"synapse": {
"level": "DEBUG"
}
},
"drains": {
"tersejson": {
"type": "network_json_terse",
"host": "127.0.0.1",
"port": 8000,
"maximum_buffer": 10,
}
},
}
# Begin the logger with our config
beginner = FakeBeginner()
setup_structured_logging(
self.hs,
self.hs.config,
log_config,
logBeginner=beginner,
redirect_stdlib_logging=False,
)
logger = Logger(namespace="synapse.logging.test_terse_json",
observer=beginner.observers[0])
# Send a bunch of useful messages
for i in range(0, 20):
logger.warn("test warn", num=i)
# Allow the reconnection
client, server = connect_client(self.reactor, 0)
self.pump()
# The first five and last five warnings made it through, the debugs and
# infos were elided
logs = list(map(json.loads, server.data.decode("utf8").splitlines()))
self.assertEqual(len(logs), 10)
self.assertEqual(Counter([x["level"] for x in logs]), {"WARN": 10})
self.assertEqual([0, 1, 2, 3, 4, 15, 16, 17, 18, 19],
[x["num"] for x in logs])