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# Copyright (c) 2016 OpenStack Foundation
#
# 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.
"""A usage example with helper debugging of minimum Oslo Logging
This example requires the following package to be installed.
$ pip install oslo.log
Additional Oslo packages installed include oslo.config, oslo.context,
oslo.i18n, oslo.serialization and oslo.utils.
More information about Oslo Logging can be found at:
https://docs.openstack.org/oslo.log/latest/user/index.html
"""
# Use default Python logging to display running output
import logging as py_logging
from oslo_config import cfg
from oslo_log import log as logging
LOG = py_logging.getLogger(__name__)
CONF = cfg.CONF
DOMAIN = "demo"
def prepare():
"""Prepare Oslo Logging (2 or 3 steps)
Use of Oslo Logging involves the following:
* logging.register_options
* logging.set_defaults (optional)
* logging.setup
"""
LOG.debug("Prepare Oslo Logging")
LOG.info("Size of configuration options before %d", len(CONF))
# Required step to register common, logging and generic configuration
# variables
logging.register_options(CONF)
LOG.info("Size of configuration options after %d", len(CONF))
# Optional step to set new defaults if necessary for
# * logging_context_format_string
# * default_log_levels
#
# These variables default to respectively:
#
# import oslo_log
# oslo_log._options.DEFAULT_LOG_LEVELS
# oslo_log._options.log_opts[0].default
#
custom_log_level_defaults = logging.get_default_log_levels() + [
'dogpile=INFO',
'routes=INFO'
]
logging.set_defaults(default_log_levels=custom_log_level_defaults)
# NOTE: We cannot show the contents of the CONF object
# after register_options() because accessing this caches
# the default_log_levels subsequently modified with set_defaults()
LOG.info("List of Oslo Logging configuration options and current values")
LOG.info("=" * 80)
for c in CONF:
LOG.info("{} = {}".format(c, CONF[c]))
LOG.info("=" * 80)
# Required setup based on configuration and domain
logging.setup(CONF, DOMAIN)
if __name__ == '__main__':
py_logging.basicConfig(level=py_logging.DEBUG)
prepare()
# NOTE: These examples do not demonstration Oslo i18n messages
LOG.info("Welcome to Oslo Logging")
LOG.debug("A debugging message")
LOG.warning("A warning occurred")
LOG.error("An error occurred")
try:
raise Exception("This is exceptional")
except Exception:
LOG.exception("An Exception occurred")
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