Python logging handler to log debug info only if an error occured
read test.py for usage details and a dict config example.
- import
>>> import logging
>>> import batchloghandler
- intitialize the handler
- BatchLogHndler takes at least 3 params :
- backend handler (where the log lines are finally sent)
- normal log level (this level and above will allways be logged directly)
- trigger level (the log level that triggers the flush of saved log lines)
- additionnal named parameters are passed to the backend handler's constructor
- BatchLogHndler takes at least 3 params :
the result is an instance of a Handler inheriting from BatchLogHandlerBase and the backend handler
>>> handler = batchloghandler.BatchLogHandler(logging.StreamHandler, "INFO", "ERROR")
- set the handler minimal log level
>>> handler.setLevel(logging.DEBUG)
- attach the hanlder to the logger
>>> logger = logging.getLogger()
>>> logger.setLevel(logging.DEBUG)
>>> logger.addHandler(handler)
- the logger works as expected at normal log level
>>> logger.info('info1')
info1
- and it hopefully swallows lower levels
>>> logger.debug('debug1')
- from now on, the handler will record lower level log lines
>>> batchloghandler.record()
- let's do it
>>> logger.debug('debug2')
>>> logger.info('info2')
info2
>>> logger.debug('debug3')
>>> logger.error('error1')
debug2
debug3
error1
- recorded debugs are emited. From now on the logger will work as a regular debug logger
>>> logger.debug('debug4')
debug4
- stop recording. Back to the original behaviour: log info and do not record anything
>>> batchloghandler.stop()
>>> logger.info('info3')
info3
>>> logger.debug('debug5')
>>> logger.error('error2')
error2
>>>
Just add this in your settings (the middleware must be as near of the top as possible to handle other middlewares logs):
MIDDLEWARE_CLASSES = (
'batchloghandler.django_utils.Middleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'...'
)
import logging
LOGGING = {
'version': 1,
'disable_existing_loggers': False,
'formatters': {
'default': {
'format': '%(levelname)s %(name)s %(message)s'
},
},
'handlers': {
'batch':{
## logging stuff to instanciate the handler
'()': 'ext://batchloghandler.BatchLogHandler',
'level':'DEBUG',
'formatter': 'default',
## batchloghandler args
# the backend handler, where to log
'blh_backend': logging.StreamHandler,
# logs over this level are allways emited
'blh_bypass_level': 'INFO',
'blh_trigger_level': 'ERROR',
## these keywords are passed to the backend handler constructor
# 'stream': StringIO.StringIO()
},
},
'loggers': {
# this is used internally by django, you should add this.
'django': {
'handlers': ['batch'],
'level': 'DEBUG',
},
'my_test_app': {
'handlers': ['batch'],
'level': 'DEBUG',
},
},
}
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