Source code for rhaptos2.repo.log

#!/usr/bin/env python
#! -*- coding: utf-8 -*-

###
# Copyright (c) Rice University 2012-13
# This software is subject to
# the provisions of the GNU Affero General
# Public License version 3 (AGPLv3).
# See LICENCE.txt for details.
###


'''
Provide common logging facilites for all rhaptos2 components.



We expect to create two log *handlers* in the application

1. to log audit messages to stderr
2. to fire off statsd events 

We combine both into one logger, I think that is the best approach.

See set_logger in rhaptos2.repo for useage

Changelog:

2012-09-13 : removed the get_logger facility, basically each app is
             responsible for setting up its own logger.  This merely
             supplies a custom Handler for statsd



'''

import os
import logging
from logging import StreamHandler
import statsd


[docs]class StatsdHandler(logging.Handler): """Logging Handler class that emits statsd calls to graphite, then stdout It *only* does incr logs, ie event counting. Thats probably appropriate for most all log related stats issues - we init with host and port, probably a bad idea. Just do not want to muck around with config mdule for logging yet. >>> lg = logging.getLogger("doctest") >>> h = StatsdHandler("localhost", 2222, True) >>> lg.addHandler(h) >>> lg.warn("an error", extra={"statsd": ['a.b', 'e.f']}) Firing a.b Firing e.f So we take it on trust that statsd fired. This is a unsolved problem with statsd. """ def __init__(self, host, port, debug=False): logging.Handler.__init__(self) self.stats_client = statsd.StatsClient( host, port) self.debug = debug
[docs] def emit(self, record): """given a LogRecord r, extract the dotted names if any and fire off Hmm, testing this in doctest (in anything) is hard.... So A totally contrived test """ if "statsd" not in record.__dict__.keys(): pass # hmmm no logging in the logger? else: for s in record.statsd: self.stats_client.incr(s) if self.debug == True: print "Firing %s" % s
if __name__ == '__main__': import doctest doctest.testmod()

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