anonymousland-synapse/synapse/config/logger.py
Erik Johnston bf5c9706d9 Remove full_twisted_stacktraces option
The debug 'full_twisted_stacktraces' flag caused synapse to rewrite
twisted deferreds to always fire the callback on the next reactor tick.
This was to force the deferred to always store the stacktraces on
exceptions, and thus be more likely to have a full stacktrace when it
reaches the final error handlers and gets printed to the logs.

Dynamically rewriting things is generally bad, and in particular this
change violates assumptions of various bits of Twisted. This wouldn't
necessarily be so bad, but it turns out this option has been turned on
on some production servers.

Turning the option can cause e.g. #1778.

For now, lets just entirely nuke this option.
2017-01-12 10:32:52 +00:00

187 lines
5.9 KiB
Python

# -*- coding: utf-8 -*-
# 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.
from ._base import Config
from synapse.util.logcontext import LoggingContextFilter
from twisted.logger import globalLogBeginner, STDLibLogObserver
import logging
import logging.config
import yaml
from string import Template
import os
import signal
DEFAULT_LOG_CONFIG = Template("""
version: 1
formatters:
precise:
format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s\
- %(message)s'
filters:
context:
(): synapse.util.logcontext.LoggingContextFilter
request: ""
handlers:
file:
class: logging.handlers.RotatingFileHandler
formatter: precise
filename: ${log_file}
maxBytes: 104857600
backupCount: 10
filters: [context]
level: INFO
console:
class: logging.StreamHandler
formatter: precise
filters: [context]
loggers:
synapse:
level: INFO
synapse.storage.SQL:
level: INFO
root:
level: INFO
handlers: [file, console]
""")
class LoggingConfig(Config):
def read_config(self, config):
self.verbosity = config.get("verbose", 0)
self.log_config = self.abspath(config.get("log_config"))
self.log_file = self.abspath(config.get("log_file"))
def default_config(self, config_dir_path, server_name, **kwargs):
log_file = self.abspath("homeserver.log")
log_config = self.abspath(
os.path.join(config_dir_path, server_name + ".log.config")
)
return """
# Logging verbosity level.
verbose: 0
# File to write logging to
log_file: "%(log_file)s"
# A yaml python logging config file
log_config: "%(log_config)s"
""" % locals()
def read_arguments(self, args):
if args.verbose is not None:
self.verbosity = args.verbose
if args.log_config is not None:
self.log_config = args.log_config
if args.log_file is not None:
self.log_file = args.log_file
def add_arguments(cls, parser):
logging_group = parser.add_argument_group("logging")
logging_group.add_argument(
'-v', '--verbose', dest="verbose", action='count',
help="The verbosity level."
)
logging_group.add_argument(
'-f', '--log-file', dest="log_file",
help="File to log to."
)
logging_group.add_argument(
'--log-config', dest="log_config", default=None,
help="Python logging config file"
)
def generate_files(self, config):
log_config = config.get("log_config")
if log_config and not os.path.exists(log_config):
with open(log_config, "wb") as log_config_file:
log_config_file.write(
DEFAULT_LOG_CONFIG.substitute(log_file=config["log_file"])
)
def setup_logging(self):
setup_logging(self.log_config, self.log_file, self.verbosity)
def setup_logging(log_config=None, log_file=None, verbosity=None):
log_format = (
"%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s"
" - %(message)s"
)
if log_config is None:
level = logging.INFO
level_for_storage = logging.INFO
if verbosity:
level = logging.DEBUG
if verbosity > 1:
level_for_storage = logging.DEBUG
# FIXME: we need a logging.WARN for a -q quiet option
logger = logging.getLogger('')
logger.setLevel(level)
logging.getLogger('synapse.storage').setLevel(level_for_storage)
formatter = logging.Formatter(log_format)
if log_file:
# TODO: Customisable file size / backup count
handler = logging.handlers.RotatingFileHandler(
log_file, maxBytes=(1000 * 1000 * 100), backupCount=3
)
def sighup(signum, stack):
logger.info("Closing log file due to SIGHUP")
handler.doRollover()
logger.info("Opened new log file due to SIGHUP")
# TODO(paul): obviously this is a terrible mechanism for
# stealing SIGHUP, because it means no other part of synapse
# can use it instead. If we want to catch SIGHUP anywhere
# else as well, I'd suggest we find a nicer way to broadcast
# it around.
if getattr(signal, "SIGHUP"):
signal.signal(signal.SIGHUP, sighup)
else:
handler = logging.StreamHandler()
handler.setFormatter(formatter)
handler.addFilter(LoggingContextFilter(request=""))
logger.addHandler(handler)
else:
with open(log_config, 'r') as f:
logging.config.dictConfig(yaml.load(f))
# It's critical to point twisted's internal logging somewhere, otherwise it
# stacks up and leaks kup to 64K object;
# see: https://twistedmatrix.com/trac/ticket/8164
#
# Routing to the python logging framework could be a performance problem if
# the handlers blocked for a long time as python.logging is a blocking API
# see https://twistedmatrix.com/documents/current/core/howto/logger.html
# filed as https://github.com/matrix-org/synapse/issues/1727
#
# However this may not be too much of a problem if we are just writing to a file.
observer = STDLibLogObserver()
globalLogBeginner.beginLoggingTo([observer])