Source code for ops.log

# Copyright 2020 Canonical 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
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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import sys
import logging


[docs]class JujuLogHandler(logging.Handler): """A handler for sending logs to Juju via juju-log.""" def __init__(self, model_backend, level=logging.DEBUG): super().__init__(level) self.model_backend = model_backend
[docs] def emit(self, record): self.model_backend.juju_log(record.levelname, self.format(record))
[docs]def setup_root_logging(model_backend, debug=False): """Setup python logging to forward messages to juju-log. By default, logging is set to DEBUG level, and messages will be filtered by Juju. Charmers can also set their own default log level with:: logging.getLogger().setLevel(logging.INFO) model_backend -- a ModelBackend to use for juju-log debug -- if True, write logs to stderr as well as to juju-log. """ logger = logging.getLogger() logger.setLevel(logging.DEBUG) logger.addHandler(JujuLogHandler(model_backend)) if debug: handler = logging.StreamHandler() formatter = logging.Formatter('%(asctime)s %(levelname)-8s %(message)s') handler.setFormatter(formatter) logger.addHandler(handler) sys.excepthook = lambda etype, value, tb: logger.error( "Uncaught exception while in charm code:", exc_info=(etype, value, tb))