TWISTED LOGGING WITH PYTHON LOGGING LEVELS

gistfile1.py

import twisted
import logging
from twisted.python import log

### http://stackoverflow.com/questions/13748222/twisted-log-level-switch

class LevelFileLogObserver(log.FileLogObserver):

    def __init__(self, f, level=logging.INFO):
        log.FileLogObserver.__init__(self, f)
        self.logLevel = level

    def emit(self, eventDict):
        if eventDict['isError']:
            level = logging.ERROR
        elif 'level' in eventDict:
            level = eventDict['level']
        else:
            level = logging.INFO
        if level == self.logLevel:
            log.FileLogObserver.emit(self, eventDict)

#---------------------------------------------------------------------#
# USAGE OF LevelFileLogObserver                                       #
#---------------------------------------------------------------------#

# THIS IS YOUR TAP.py FILE!
# mode is whatever the arbitrary 'mode' you set your twistd process in
# this way various twistds don't write into each other's logs


#IF THE LOGS DIRECTORY FOR THIS MODE DOESN'T EXIST CREATE IT
logs_dir = '/tmp/logs/%s/'%(mode)
if not os.path.exists(logs_dir):
    os.makedirs(logs_dir)

# THE PYTHON LIBRARY LOG LEVELS
levels = ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL']

# GENERATE LOGFILES PER SERVER PER LOG LEVEL
for level in levels:
    levlog = logfile.LogFile(
        "%s_%s.log"%(mode, level.lower()), 
        logs_dir, rotateLength=100000,
        maxRotatedFiles=100
    )
    # LevelFileLogObserver ROUTES LOG MESSAGES TO 
    logr = LevelFileLogObserver(levlog, level=getattr(logging, level))
    twisted.python.log.addObserver(logr.emit)

# TEST EACH OF THE LOGS
log.msg('the level of this message is INFO', 
    level=logging.INFO)
log.msg('the level of this message is DEBUG', 
    level=logging.DEBUG)
log.msg('the level of this message is WARNING', 
    level=logging.WARNING)
log.msg('the level of this message is ERROR', 
    level=logging.ERROR)
log.msg('the level of this message is CRITICAL', 
    level=logging.CRITICAL)