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79 lines
2.2 KiB
79 lines
2.2 KiB
7 years ago
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# -*- coding: utf-8 -*-
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"""
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flask.logging
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~~~~~~~~~~~~~
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:copyright: © 2010 by the Pallets team.
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:license: BSD, see LICENSE for more details.
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"""
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from __future__ import absolute_import
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import logging
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import sys
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from werkzeug.local import LocalProxy
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from .globals import request
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@LocalProxy
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def wsgi_errors_stream():
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"""Find the most appropriate error stream for the application. If a request
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is active, log to ``wsgi.errors``, otherwise use ``sys.stderr``.
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If you configure your own :class:`logging.StreamHandler`, you may want to
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use this for the stream. If you are using file or dict configuration and
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can't import this directly, you can refer to it as
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``ext://flask.logging.wsgi_errors_stream``.
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"""
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return request.environ['wsgi.errors'] if request else sys.stderr
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def has_level_handler(logger):
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"""Check if there is a handler in the logging chain that will handle the
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given logger's :meth:`effective level <~logging.Logger.getEffectiveLevel>`.
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"""
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level = logger.getEffectiveLevel()
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current = logger
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while current:
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if any(handler.level <= level for handler in current.handlers):
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return True
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if not current.propagate:
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break
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current = current.parent
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return False
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#: Log messages to :func:`~flask.logging.wsgi_errors_stream` with the format
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#: ``[%(asctime)s] %(levelname)s in %(module)s: %(message)s``.
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default_handler = logging.StreamHandler(wsgi_errors_stream)
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default_handler.setFormatter(logging.Formatter(
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'[%(asctime)s] %(levelname)s in %(module)s: %(message)s'
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))
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def create_logger(app):
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"""Get the ``'flask.app'`` logger and configure it if needed.
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When :attr:`~flask.Flask.debug` is enabled, set the logger level to
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:data:`logging.DEBUG` if it is not set.
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If there is no handler for the logger's effective level, add a
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:class:`~logging.StreamHandler` for
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:func:`~flask.logging.wsgi_errors_stream` with a basic format.
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"""
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logger = logging.getLogger('flask.app')
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if app.debug and logger.level == logging.NOTSET:
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logger.setLevel(logging.DEBUG)
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if not has_level_handler(logger):
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logger.addHandler(default_handler)
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return logger
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