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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.
import logging
import logging.config
import os
import sys
from string import Template
import yaml
from twisted.logger import STDLibLogObserver, globalLogBeginner
import synapse
from synapse.app import _base as appbase
from synapse.logging.context import LoggingContextFilter
from synapse.util.versionstring import get_version_string
from ._base import Config
DEFAULT_LOG_CONFIG = Template(
"""
version: 1
formatters:
precise:
format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - \
%(request)s - %(message)s'
filters:
context:
(): synapse.logging.context.LoggingContextFilter
request: ""
handlers:
file:
class: logging.handlers.RotatingFileHandler
formatter: precise
filename: ${log_file}
maxBytes: 104857600
backupCount: 10
filters: [context]
encoding: utf8
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, **kwargs):
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
#
log_config: "%(log_config)s"
"""
% locals()
)
def read_arguments(self, args):
if args.no_redirect_stdio is not None:
self.no_redirect_stdio = args.no_redirect_stdio
@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",
)
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_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 the 'worker_log_config' option
instead of 'log_config'.
register_sighup (func | None): Function to call to register a
sighup handler.
"""
log_config = config.worker_log_config if use_worker_options else config.log_config
if log_config 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)
handler.addFilter(LoggingContextFilter(request=""))
logger.addHandler(handler)
else:
def load_log_config():
with open(log_config, "r") as f:
logging.config.dictConfig(yaml.safe_load(f))
def sighup(*args):
# it might be better to use a file watcher or something for this.
load_log_config()
logging.info("Reloaded log config from %s due to SIGHUP", log_config)
load_log_config()
appbase.register_sighup(sighup)
# make sure that the first thing we log is a thing we can grep backwards
# for
logging.warn("***** STARTING SERVER *****")
logging.warn("Server %s version %s", sys.argv[0], get_version_string(synapse))
logging.info("Server hostname: %s", config.server_name)
# 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()
def _log(event):
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
return observer(event)
globalLogBeginner.beginLoggingTo(
[_log], redirectStandardIO=not config.no_redirect_stdio
)
if not config.no_redirect_stdio:
print("Redirected stdout/stderr to logs")
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