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# -*- 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]
console:
class: logging.StreamHandler
formatter: precise
filters: [context]
loggers:
synapse:
level: INFO
synapse.storage.SQL:
# beware: increasing this to DEBUG will make synapse log sensitive
# information such as access tokens.
level: INFO
root:
level: INFO
handlers: [file, console]
""")
class LoggingConfig(Config):
def read_config(self, config):
self.verbosity = config.get("verbose", 0)
self.no_redirect_stdio = config.get("no_redirect_stdio", False)
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 """
# 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.no_redirect_stdio is not None:
self.no_redirect_stdio = args.no_redirect_stdio
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. Specify multiple times to increase "
"verbosity. (Ignored if --log-config is specified.)"
)
logging_group.add_argument(
'-f', '--log-file', dest="log_file",
help="File to log to. (Ignored if --log-config is specified.)"
)
logging_group.add_argument(
'--log-config', dest="log_config", default=None,
help="Python logging config file"
)
logging_group.add_argument(
'-n', '--no-redirect-stdio',
action='store_true', default=None,
help="Do not redirect stdout/stderr to the log"
)
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(config, use_worker_options=False):
""" Set up python logging
Args:
config (LoggingConfig | synapse.config.workers.WorkerConfig):
configuration data
use_worker_options (bool): True to use 'worker_log_config' and
'worker_log_file' options instead of 'log_config' and 'log_file'.
"""
log_config = (config.worker_log_config if use_worker_options
else config.log_config)
log_file = (config.worker_log_file if use_worker_options
else config.log_file)
log_format = (
"%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s"
" - %(message)s"
)
if log_config is None:
# We don't have a logfile, so fall back to the 'verbosity' param from
# the config or cmdline. (Note that we generate a log config for new
# installs, so this will be an unusual case)
level = logging.INFO
level_for_storage = logging.INFO
if config.verbosity:
level = logging.DEBUG
if config.verbosity > 1:
level_for_storage = logging.DEBUG
logger = logging.getLogger('')
logger.setLevel(level)
logging.getLogger('synapse.storage.SQL').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")
else:
handler = logging.StreamHandler()
def sighup(signum, stack):
pass
handler.setFormatter(formatter)
handler.addFilter(LoggingContextFilter(request=""))
logger.addHandler(handler)
else:
def load_log_config():
with open(log_config, 'r') as f:
logging.config.dictConfig(yaml.load(f))
def sighup(signum, stack):
# it might be better to use a file watcher or something for this.
logging.info("Reloading log config from %s due to SIGHUP",
log_config)
load_log_config()
load_log_config()
# 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)
# 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],
redirectStandardIO=not config.no_redirect_stdio,
)
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