mirror of
https://mau.dev/maunium/synapse.git
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db131b6b22
* Change default log config to buffer by default. This batches up writes to the filesystem, which is more efficient for disk I/O. This means that it can take some time for logs to get written to disk. Note that ERROR logs (and above) immediately flush the buffer. This only effects new installs, as we only write the log config if started with `--generate-config` (in the same way we do for generating signing keys). * Default to keeping last 4 days of logs. This hopefully reduces the amount of logs kept for new servers. Keeping the last 1GB of logs is likely overkill for new servers, but equally may not be enough for busy ones. Instead, we keep the last four days worth of logs, enough so that admins can investigate any problems that happened over e.g. a long weekend.
294 lines
9.1 KiB
Python
294 lines
9.1 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import argparse
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import logging
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import logging.config
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import os
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import sys
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from string import Template
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import yaml
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from twisted.logger import (
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ILogObserver,
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LogBeginner,
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STDLibLogObserver,
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globalLogBeginner,
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)
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import synapse
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from synapse.app import _base as appbase
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from synapse.logging._structured import (
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reload_structured_logging,
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setup_structured_logging,
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)
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from synapse.logging.context import LoggingContextFilter
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from synapse.util.versionstring import get_version_string
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from ._base import Config, ConfigError
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DEFAULT_LOG_CONFIG = Template(
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"""\
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# Log configuration for Synapse.
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#
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# This is a YAML file containing a standard Python logging configuration
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# dictionary. See [1] for details on the valid settings.
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#
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# [1]: https://docs.python.org/3.7/library/logging.config.html#configuration-dictionary-schema
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version: 1
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formatters:
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precise:
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format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - \
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%(request)s - %(message)s'
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filters:
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context:
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(): synapse.logging.context.LoggingContextFilter
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request: ""
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handlers:
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file:
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class: logging.handlers.TimedRotatingFileHandler
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formatter: precise
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filename: ${log_file}
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when: midnight
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backupCount: 3 # Does not include the current log file.
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encoding: utf8
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# Default to buffering writes to log file for efficiency. This means that
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# will be a delay for INFO/DEBUG logs to get written, but WARNING/ERROR
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# logs will still be flushed immediately.
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buffer:
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class: logging.handlers.MemoryHandler
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filters: [context]
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target: file
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# The capacity is the number of log lines that are buffered before
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# being written to disk. Increasing this will lead to better
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# performance, at the expensive of it taking longer for log lines to
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# be written to disk.
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capacity: 10
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flushLevel: 30 # Flush for WARNING logs as well
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# A handler that writes logs to stderr. Unused by default, but can be used
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# instead of "buffer" and "file" in the logger handlers.
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console:
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class: logging.StreamHandler
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formatter: precise
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filters: [context]
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loggers:
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synapse.storage.SQL:
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# beware: increasing this to DEBUG will make synapse log sensitive
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# information such as access tokens.
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level: INFO
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twisted:
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# We send the twisted logging directly to the file handler,
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# to work around https://github.com/matrix-org/synapse/issues/3471
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# when using "buffer" logger. Use "console" to log to stderr instead.
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handlers: [file]
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propagate: false
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root:
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level: INFO
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# Write logs to the `buffer` handler, which will buffer them together in memory,
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# then write them to a file.
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#
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# Replace "buffer" with "console" to log to stderr instead. (Note that you'll
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# also need to update the configuation for the `twisted` logger above, in
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# this case.)
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#
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handlers: [buffer]
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disable_existing_loggers: false
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"""
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)
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LOG_FILE_ERROR = """\
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Support for the log_file configuration option and --log-file command-line option was
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removed in Synapse 1.3.0. You should instead set up a separate log configuration file.
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"""
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class LoggingConfig(Config):
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section = "logging"
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def read_config(self, config, **kwargs):
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if config.get("log_file"):
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raise ConfigError(LOG_FILE_ERROR)
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self.log_config = self.abspath(config.get("log_config"))
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self.no_redirect_stdio = config.get("no_redirect_stdio", False)
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def generate_config_section(self, config_dir_path, server_name, **kwargs):
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log_config = os.path.join(config_dir_path, server_name + ".log.config")
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return (
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"""\
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## Logging ##
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# A yaml python logging config file as described by
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# https://docs.python.org/3.7/library/logging.config.html#configuration-dictionary-schema
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#
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log_config: "%(log_config)s"
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"""
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% locals()
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)
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def read_arguments(self, args):
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if args.no_redirect_stdio is not None:
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self.no_redirect_stdio = args.no_redirect_stdio
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if args.log_file is not None:
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raise ConfigError(LOG_FILE_ERROR)
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@staticmethod
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def add_arguments(parser):
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logging_group = parser.add_argument_group("logging")
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logging_group.add_argument(
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"-n",
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"--no-redirect-stdio",
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action="store_true",
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default=None,
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help="Do not redirect stdout/stderr to the log",
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)
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logging_group.add_argument(
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"-f", "--log-file", dest="log_file", help=argparse.SUPPRESS,
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)
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def generate_files(self, config, config_dir_path):
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log_config = config.get("log_config")
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if log_config and not os.path.exists(log_config):
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log_file = self.abspath("homeserver.log")
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print(
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"Generating log config file %s which will log to %s"
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% (log_config, log_file)
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)
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with open(log_config, "w") as log_config_file:
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log_config_file.write(DEFAULT_LOG_CONFIG.substitute(log_file=log_file))
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def _setup_stdlib_logging(config, log_config, logBeginner: LogBeginner):
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"""
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Set up Python stdlib logging.
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"""
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if log_config is None:
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log_format = (
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"%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s"
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" - %(message)s"
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)
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logger = logging.getLogger("")
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logger.setLevel(logging.INFO)
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logging.getLogger("synapse.storage.SQL").setLevel(logging.INFO)
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formatter = logging.Formatter(log_format)
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handler = logging.StreamHandler()
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handler.setFormatter(formatter)
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handler.addFilter(LoggingContextFilter(request=""))
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logger.addHandler(handler)
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else:
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logging.config.dictConfig(log_config)
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# Route Twisted's native logging through to the standard library logging
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# system.
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observer = STDLibLogObserver()
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def _log(event):
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if "log_text" in event:
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if event["log_text"].startswith("DNSDatagramProtocol starting on "):
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return
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if event["log_text"].startswith("(UDP Port "):
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return
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if event["log_text"].startswith("Timing out client"):
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return
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return observer(event)
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logBeginner.beginLoggingTo([_log], redirectStandardIO=not config.no_redirect_stdio)
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if not config.no_redirect_stdio:
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print("Redirected stdout/stderr to logs")
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return observer
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def _reload_stdlib_logging(*args, log_config=None):
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logger = logging.getLogger("")
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if not log_config:
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logger.warning("Reloaded a blank config?")
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logging.config.dictConfig(log_config)
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def setup_logging(
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hs, config, use_worker_options=False, logBeginner: LogBeginner = globalLogBeginner
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) -> ILogObserver:
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"""
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Set up the logging subsystem.
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Args:
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config (LoggingConfig | synapse.config.worker.WorkerConfig):
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configuration data
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use_worker_options (bool): True to use the 'worker_log_config' option
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instead of 'log_config'.
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logBeginner: The Twisted logBeginner to use.
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Returns:
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The "root" Twisted Logger observer, suitable for sending logs to from a
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Logger instance.
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"""
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log_config = config.worker_log_config if use_worker_options else config.log_config
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def read_config(*args, callback=None):
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if log_config is None:
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return None
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with open(log_config, "rb") as f:
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log_config_body = yaml.safe_load(f.read())
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if callback:
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callback(log_config=log_config_body)
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logging.info("Reloaded log config from %s due to SIGHUP", log_config)
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return log_config_body
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log_config_body = read_config()
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if log_config_body and log_config_body.get("structured") is True:
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logger = setup_structured_logging(
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hs, config, log_config_body, logBeginner=logBeginner
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)
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appbase.register_sighup(read_config, callback=reload_structured_logging)
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else:
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logger = _setup_stdlib_logging(config, log_config_body, logBeginner=logBeginner)
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appbase.register_sighup(read_config, callback=_reload_stdlib_logging)
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# make sure that the first thing we log is a thing we can grep backwards
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# for
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logging.warning("***** STARTING SERVER *****")
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logging.warning("Server %s version %s", sys.argv[0], get_version_string(synapse))
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logging.info("Server hostname: %s", config.server_name)
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logging.info("Instance name: %s", hs.get_instance_name())
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return logger
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