# -*- 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_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): log_file = self.abspath("homeserver.log") with open(log_config, "wb") 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 '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, )