forked from LBRYCommunity/lbry-sdk
183 lines
6 KiB
Python
183 lines
6 KiB
Python
import logging
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import logging.handlers
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import sys
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import twisted.python.log
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DEFAULT_FORMAT = "%(asctime)s %(levelname)-8s %(name)s:%(lineno)d: %(message)s"
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DEFAULT_FORMATTER = logging.Formatter(DEFAULT_FORMAT)
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def remove_handlers(log, handler_name):
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for handler in log.handlers:
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if handler.name == handler_name:
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log.removeHandler(handler)
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def _log_decorator(fn):
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"""Configure a logging handler.
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`fn` is a function that returns a logging handler. The returned
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handler has its log-level set and is attached to the specified
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logger or the root logger.
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"""
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def helper(*args, **kwargs):
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log = kwargs.pop('log', logging.getLogger())
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level = kwargs.pop('level', logging.INFO)
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if not isinstance(level, int):
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# despite the name, getLevelName returns
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# the numeric level when passed a text level
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level = logging.getLevelName(level)
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handler = fn(*args, **kwargs)
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configure_handler(handler, log, level)
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return handler
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return helper
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def configure_handler(handler, log, level):
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if handler.name:
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remove_handlers(log, handler.name)
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handler.setLevel(level)
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log.addHandler(handler)
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# need to reduce the logger's level down to the
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# handler's level or else the handler won't
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# get those messages
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if log.level > level:
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log.setLevel(level)
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return handler
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def disable_third_party_loggers():
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logging.getLogger('requests').setLevel(logging.CRITICAL)
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logging.getLogger('urllib3').setLevel(logging.CRITICAL)
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logging.getLogger('BitcoinRPC').setLevel(logging.INFO)
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logging.getLogger('lbryum').setLevel(logging.WARNING)
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logging.getLogger('twisted').setLevel(logging.CRITICAL)
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logging.getLogger('aioupnp').setLevel(logging.WARNING)
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@_log_decorator
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def configure_console(**kwargs):
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"""Convenience function to configure a log-handler that outputs to stdout"""
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handler = logging.StreamHandler(sys.stdout)
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handler.setFormatter(DEFAULT_FORMATTER)
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handler.name = 'console'
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return handler
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@_log_decorator
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def configure_file_handler(file_name, **kwargs):
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"""Convenience function to configure a log-handler that writes to `file_name`"""
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handler = logging.handlers.RotatingFileHandler(file_name, maxBytes=2097152, backupCount=5)
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handler.setFormatter(DEFAULT_FORMATTER)
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handler.name = 'file'
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return handler
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def failure(failure, log, msg, *args):
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"""Log a failure message from a deferred.
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Args:
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failure: twisted.python.failure.Failure
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log: a python logger instance
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msg: the message to log. Can use normal logging string interpolation.
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the last argument will be set to the error message from the failure.
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args: values to substitute into `msg`
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"""
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args += (failure.getErrorMessage(),)
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exc_info = (failure.type, failure.value, failure.getTracebackObject())
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log.error(msg, *args, exc_info=exc_info)
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def convert_verbose(verbose):
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"""Convert the results of the --verbose flag into a list of logger names
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if --verbose is not provided, args.verbose will be None and logging
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should be at the info level.
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if --verbose is provided, but not followed by any arguments, then
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args.verbose = [] and debug logging should be enabled for all of lbrynet
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along with info logging on lbryum.
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if --verbose is provided and followed by arguments, those arguments
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will be in a list
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"""
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if verbose is None:
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return []
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if verbose == []:
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return ['lbrynet', 'lbryum']
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return verbose
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def configure_logging(file_name, console, verbose=None):
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"""Apply the default logging configuration.
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Enables two log-handlers at the INFO level: a file logger and a loggly logger.
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Optionally turns on a console logger that defaults to the INFO level, with
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specified loggers being set to the DEBUG level.
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Args:
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file_name: the file to which logs should be saved
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console: If true, enable a console logger
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verbose: a list of loggers to set to debug level.
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See `convert_verbose` for more details.
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"""
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verbose = convert_verbose(verbose)
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configure_twisted()
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configure_file_handler(file_name)
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disable_third_party_loggers()
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if console:
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# if there are some loggers at the debug level, we need
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# to enable the console to allow debug. Otherwise, only
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# allow info.
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level = 'DEBUG' if verbose else 'INFO'
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handler = configure_console(level=level)
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if 'lbryum' in verbose:
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# TODO: this enables lbryum logging on the other handlers
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# too which isn't consistent with how verbose logging
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# happens with other loggers. Should change the configuration
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# so that its only logging at the INFO level for the console.
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logging.getLogger('lbryum').setLevel(logging.INFO)
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verbose.remove('lbryum')
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if verbose:
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handler.addFilter(LoggerNameFilter(verbose))
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def configure_twisted():
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"""Setup twisted logging to output events to the python stdlib logger"""
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# I tried using the new logging api
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# https://twistedmatrix.com/documents/current/core/howto/logger.html#compatibility-with-standard-library-logging
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# and it simply didn't work
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observer = twisted.python.log.PythonLoggingObserver()
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observer.start()
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class LoggerNameFilter:
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"""Filter a log record based on its name.
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Allows all info level and higher records to pass through.
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Debug records pass if the log record name (or a parent) match
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the input list of logger names.
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"""
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def __init__(self, logger_names):
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self.logger_names = logger_names
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def filter(self, record):
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if record.levelno >= logging.INFO:
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return True
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name = record.name
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while name:
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if name in self.logger_names:
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return True
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name = get_parent(name)
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return False
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def get_parent(logger_name):
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names = logger_name.split('.')
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if len(names) == 1:
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return ''
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names = names[:-1]
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return '.'.join(names)
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