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# -*- coding: utf-8 -*-
"""
flask.logging
~~~~~~~~~~~~~
Implements the logging support for Flask.
:copyright: (c) 2011 by Armin Ronacher.
:license: BSD, see LICENSE for more details.
"""
from __future__ import absolute_import
from logging import getLogger, StreamHandler, Formatter, getLoggerClass, DEBUG
def create_logger(app):
"""Creates a logger for the given application. This logger works
similar to a regular Python logger but changes the effective logging
level based on the application's debug flag. Furthermore this
function also removes all attached handlers in case there was a
logger with the log name before.
"""
Logger = getLoggerClass()
class DebugLogger(Logger):
def getEffectiveLevel(x):
return DEBUG if app.debug else Logger.getEffectiveLevel(x)
class DebugHandler(StreamHandler):
def emit(x, record):
StreamHandler.emit(x, record) if app.debug else None
handler = DebugHandler()
handler.setLevel(DEBUG)
handler.setFormatter(Formatter(app.debug_log_format))
logger = getLogger(app.logger_name)
# just in case that was not a new logger, get rid of all the handlers
# already attached to it.
del logger.handlers[:]
logger.__class__ = DebugLogger
logger.addHandler(handler)
return logger
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