synapse-product/synapse/config/logger.py

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# Copyright 2014-2016 OpenMarket Ltd
#
# 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.
import argparse
import logging
import logging.config
import os
import sys
import threading
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from string import Template
import yaml
from zope.interface import implementer
from twisted.logger import (
ILogObserver,
LogBeginner,
STDLibLogObserver,
eventAsText,
globalLogBeginner,
)
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import synapse
from synapse.logging._structured import setup_structured_logging
from synapse.logging.context import LoggingContextFilter
from synapse.logging.filter import MetadataFilter
from synapse.util.versionstring import get_version_string
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from ._base import Config, ConfigError
DEFAULT_LOG_CONFIG = Template(
"""\
# Log configuration for Synapse.
#
# This is a YAML file containing a standard Python logging configuration
# dictionary. See [1] for details on the valid settings.
#
# Synapse also supports structured logging for machine readable logs which can
# be ingested by ELK stacks. See [2] for details.
#
# [1]: https://docs.python.org/3.7/library/logging.config.html#configuration-dictionary-schema
# [2]: https://matrix-org.github.io/synapse/latest/structured_logging.html
version: 1
formatters:
precise:
format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - \
%(request)s - %(message)s'
handlers:
file:
class: logging.handlers.TimedRotatingFileHandler
formatter: precise
filename: ${log_file}
when: midnight
backupCount: 3 # Does not include the current log file.
encoding: utf8
# Default to buffering writes to log file for efficiency. This means that
# will be a delay for INFO/DEBUG logs to get written, but WARNING/ERROR
# logs will still be flushed immediately.
buffer:
class: logging.handlers.MemoryHandler
target: file
# The capacity is the number of log lines that are buffered before
# being written to disk. Increasing this will lead to better
# performance, at the expensive of it taking longer for log lines to
# be written to disk.
capacity: 10
flushLevel: 30 # Flush for WARNING logs as well
# A handler that writes logs to stderr. Unused by default, but can be used
# instead of "buffer" and "file" in the logger handlers.
console:
class: logging.StreamHandler
formatter: precise
loggers:
synapse.storage.SQL:
# beware: increasing this to DEBUG will make synapse log sensitive
# information such as access tokens.
level: INFO
twisted:
# We send the twisted logging directly to the file handler,
# to work around https://github.com/matrix-org/synapse/issues/3471
# when using "buffer" logger. Use "console" to log to stderr instead.
handlers: [file]
propagate: false
root:
level: INFO
# Write logs to the `buffer` handler, which will buffer them together in memory,
# then write them to a file.
#
# Replace "buffer" with "console" to log to stderr instead. (Note that you'll
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# also need to update the configuration for the `twisted` logger above, in
# this case.)
#
handlers: [buffer]
disable_existing_loggers: false
"""
)
LOG_FILE_ERROR = """\
Support for the log_file configuration option and --log-file command-line option was
removed in Synapse 1.3.0. You should instead set up a separate log configuration file.
"""
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class LoggingConfig(Config):
section = "logging"
def read_config(self, config, **kwargs):
if config.get("log_file"):
raise ConfigError(LOG_FILE_ERROR)
self.log_config = self.abspath(config.get("log_config"))
self.no_redirect_stdio = config.get("no_redirect_stdio", False)
def generate_config_section(self, config_dir_path, server_name, **kwargs):
log_config = os.path.join(config_dir_path, server_name + ".log.config")
return (
"""\
## Logging ##
# A yaml python logging config file as described by
# https://docs.python.org/3.7/library/logging.config.html#configuration-dictionary-schema
#
log_config: "%(log_config)s"
"""
% locals()
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)
def read_arguments(self, args):
if args.no_redirect_stdio is not None:
self.no_redirect_stdio = args.no_redirect_stdio
if args.log_file is not None:
raise ConfigError(LOG_FILE_ERROR)
@staticmethod
def add_arguments(parser):
logging_group = parser.add_argument_group("logging")
logging_group.add_argument(
"-n",
"--no-redirect-stdio",
action="store_true",
default=None,
help="Do not redirect stdout/stderr to the log",
)
logging_group.add_argument(
"-f",
"--log-file",
dest="log_file",
help=argparse.SUPPRESS,
)
def generate_files(self, config, config_dir_path):
log_config = config.get("log_config")
if log_config and not os.path.exists(log_config):
log_file = self.abspath("homeserver.log")
print(
"Generating log config file %s which will log to %s"
% (log_config, log_file)
)
with open(log_config, "w") as log_config_file:
log_config_file.write(DEFAULT_LOG_CONFIG.substitute(log_file=log_file))
def _setup_stdlib_logging(config, log_config_path, logBeginner: LogBeginner) -> None:
"""
Set up Python standard library logging.
"""
if log_config_path is None:
log_format = (
"%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s"
" - %(message)s"
)
logger = logging.getLogger("")
logger.setLevel(logging.INFO)
logging.getLogger("synapse.storage.SQL").setLevel(logging.INFO)
formatter = logging.Formatter(log_format)
handler = logging.StreamHandler()
handler.setFormatter(formatter)
logger.addHandler(handler)
else:
# Load the logging configuration.
_load_logging_config(log_config_path)
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# We add a log record factory that runs all messages through the
# LoggingContextFilter so that we get the context *at the time we log*
# rather than when we write to a handler. This can be done in config using
# filter options, but care must when using e.g. MemoryHandler to buffer
# writes.
log_context_filter = LoggingContextFilter()
log_metadata_filter = MetadataFilter({"server_name": config.server_name})
old_factory = logging.getLogRecordFactory()
def factory(*args, **kwargs):
record = old_factory(*args, **kwargs)
log_context_filter.filter(record)
log_metadata_filter.filter(record)
return record
logging.setLogRecordFactory(factory)
# Route Twisted's native logging through to the standard library logging
# system.
observer = STDLibLogObserver()
threadlocal = threading.local()
@implementer(ILogObserver)
def _log(event: dict) -> None:
if "log_text" in event:
if event["log_text"].startswith("DNSDatagramProtocol starting on "):
return
if event["log_text"].startswith("(UDP Port "):
return
if event["log_text"].startswith("Timing out client"):
return
# this is a workaround to make sure we don't get stack overflows when the
# logging system raises an error which is written to stderr which is redirected
# to the logging system, etc.
if getattr(threadlocal, "active", False):
# write the text of the event, if any, to the *real* stderr (which may
# be redirected to /dev/null, but there's not much we can do)
try:
event_text = eventAsText(event)
print("logging during logging: %s" % event_text, file=sys.__stderr__)
except Exception:
# gah.
pass
return
try:
threadlocal.active = True
return observer(event)
finally:
threadlocal.active = False
logBeginner.beginLoggingTo([_log], redirectStandardIO=False)
def _load_logging_config(log_config_path: str) -> None:
"""
Configure logging from a log config path.
"""
with open(log_config_path, "rb") as f:
log_config = yaml.safe_load(f.read())
if not log_config:
logging.warning("Loaded a blank logging config?")
# If the old structured logging configuration is being used, convert it to
# the new style configuration.
if "structured" in log_config and log_config.get("structured"):
log_config = setup_structured_logging(log_config)
logging.config.dictConfig(log_config)
def _reload_logging_config(log_config_path):
"""
Reload the log configuration from the file and apply it.
"""
# If no log config path was given, it cannot be reloaded.
if log_config_path is None:
return
_load_logging_config(log_config_path)
logging.info("Reloaded log config from %s due to SIGHUP", log_config_path)
def setup_logging(
hs, config, use_worker_options=False, logBeginner: LogBeginner = globalLogBeginner
) -> None:
"""
Set up the logging subsystem.
Args:
config (LoggingConfig | synapse.config.worker.WorkerConfig):
configuration data
use_worker_options (bool): True to use the 'worker_log_config' option
instead of 'log_config'.
logBeginner: The Twisted logBeginner to use.
"""
log_config_path = (
config.worker_log_config if use_worker_options else config.log_config
)
# Perform one-time logging configuration.
_setup_stdlib_logging(config, log_config_path, logBeginner=logBeginner)
# Add a SIGHUP handler to reload the logging configuration, if one is available.
from synapse.app import _base as appbase
appbase.register_sighup(_reload_logging_config, log_config_path)
# Log immediately so we can grep backwards.
logging.warning("***** STARTING SERVER *****")
logging.warning("Server %s version %s", sys.argv[0], get_version_string(synapse))
logging.info("Server hostname: %s", config.server_name)
logging.info("Instance name: %s", hs.get_instance_name())