162 lines
5.7 KiB
Python
162 lines
5.7 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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"""
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Extra functionality for Flask logging
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Flask-Logging-Extras is a Flask extension that plugs into the logging
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mechanism of Flask applications.
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Flask-Logging-Extras requires you to set FLASK_LOGGING_EXTRAS_KEYWORDS to a
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dictionary value, where the dictionary key is a the key you can use in the
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log message format, and the value is a default value that is substituted if
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no value is present in the message record.
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"""
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import logging
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__version_info__ = ('0', '0', '1')
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__version__ = '.'.join(__version_info__)
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__author__ = 'Gergely Polonkai'
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__license__ = 'MIT'
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__copyright__ = '(c) 2015 GT2'
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class FlaskExtraLogger(logging.getLoggerClass()):
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"""
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A logger class that is capable of adding extra keywords to log formatters
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Usage:
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.. code-block:: python
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import logging
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from flask_logging_extras import register_logger_class
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# This must be done before the app is initialized!
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register_logger_class(cls=FlaskExtraLogger)
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app = Flask(__name__)
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app.config['FLASK_LOGGING_EXTRAS_KEYWORDS'] = {'category': '<unset>'}
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app.logger.init_app()
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formatter = logging.Formatter(
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'[%(asctime)s] [%(levelname)s] [%(category)s] %(message)s')
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handler = logging.FileHandler('app.log', mode='a')
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handler.setFormatter(formatter)
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handler.setLevel(logging.INFO)
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app.logger.addHandler(handler)
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app.logger.info('The message', category='my category')
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# This will produce something like this in app.log:
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# [TIMESTAMP2017-01-16 08:44:48.944] [INFO] [my category] The message
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"""
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def __init__(self, *args, **kwargs):
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if 'app' in kwargs:
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if kwargs['app'] is not None:
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raise TypeError(
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"Cannot initialise {classname} with an app. See the"
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"documentation of Flask-Logging-Extras for more info."
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.format(classname=self.__class__.__name__))
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else:
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# If app is None, treat it as if it wasn’t there
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del(kwargs['app'])
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self.app = None
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self._valid_keywords = []
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super(FlaskExtraLogger, self).__init__(*args, **kwargs)
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def _log(self, *args, **kwargs):
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if 'extra' not in kwargs:
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kwargs['extra'] = {}
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for kw in self._valid_keywords:
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if kw in kwargs:
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kwargs['extra'][kw] = kwargs[kw]
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del(kwargs[kw])
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else:
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kwargs['extra'][kw] = self._valid_keywords[kw]
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super(FlaskExtraLogger, self)._log(*args, **kwargs)
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def init_app(self, app):
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"""
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Intialize the logger class with a Flask application
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The class reads its necessary configuration from the config of this
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application.
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If the application doesn’t call this, or doesn’t have the
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`FLASK_LOGGING_EXTRAS_KEYWORDS` in its config, no extra
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functionality will be added.
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:param app: a Flask application
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:type app: Flask
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:raises ValueError: if the app tries to register a keyword that is
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reserved for internal use
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"""
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app.config.setdefault('FLASK_LOGGING_EXTRAS_KEYWORDS', {})
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for kw in app.config['FLASK_LOGGING_EXTRAS_KEYWORDS']:
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if kw in ['exc_info', 'extra', 'stack_info']:
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raise ValueError(
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'"{keyword}" member of FLASK_LOGGING_EXTRAS_KEYWORDS is '
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'reserved for internal use.')
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self._valid_keywords = app.config['FLASK_LOGGING_EXTRAS_KEYWORDS']
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def register_logger_class(cls=FlaskExtraLogger):
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"""
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Register a new logger class
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It is effectively a wrapper around `logging.setLoggerClass()`, with an
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added check to make sure the class can be used as a logger.
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To use the extra features of the logger class in a Flask app, you must
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call it before the app is instantiated.
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This function returns the logger class that was the default before
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calling. This might be useful if you only want to use `cls` in the
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Flask app object, but not anywhere else in your code. In this case,
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simply call `register_logger_class()` again with the return value from
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the first invocation.
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:param cls: a logger class to register as the default one
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:type cls: class(logging.Logger)
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:returns: the old default logger class
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:rtype: class
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:raises TypeError: if the class is not a subclass of `logging.Logger`
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"""
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if not issubclass(cls, logging.Logger):
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raise TypeError(
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"The logger class must be a subclass of logging.Logger!")
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old_class = logging.getLoggerClass()
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logging.setLoggerClass(cls)
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return old_class
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