vsajip

#
# Copyright 2009 Vinay Sajip
#
import logging

logger = logging.getLogger(__name__)

class LogWriter:
    def __init__(self, logger):
        self.logger = logger

vsajip

import logging.handlers
import smtplib

class BufferingSMTPHandler(logging.handlers.BufferingHandler):
    def __init__(self, mailhost, fromaddr, toaddrs, subject, capacity):
        logging.handlers.BufferingHandler.__init__(self, capacity)
        self.mailhost = mailhost
        self.mailport = None
        self.fromaddr = fromaddr
        if isinstance(toaddrs, (str, unicode)):

vsajip

#
# Copyright (C) 2009 Vinay Sajip.
# Licensed under the PSF licence.
# Exploratory code to convert %-format strings to {}-format.
#

import re

PATTERN = re.compile(r'''
%                                        # specifier start

vsajip

import json
import logging
import zmq

class QueueHandler(logging.Handler): 
    """ 
    This handler sends events to a queue. Typically, it would be used together 
    with a multiprocessing Queue to centralise logging to file in one process 
    (in a multi-process application), so as to avoid file write contention 
    between processes. 

vsajip

import logging
import time

logger = logging.getLogger(__name__)

def useful():
    logger.debug('Hello from webapplib!')
    time.sleep(0.01)

vsajip

import logging
import time

logger = logging.getLogger(__name__)

def useful():
    logger.debug('Hello from webapplib!')
    time.sleep(0.01)

vsajip

import logging
import timeit

logger = logging.getLogger(__name__)

def log_noop():
    pass

def log_simple():
    logger.info("Testing")

vsajip

import logbook
import timeit

logger = logbook.Logger(__name__)

def log_noop():
    pass

def log_simple():
    logger.info("Testing")

vsajip

vinay@zeta-lucid:~/projects/scratch$ python time_logging.py
log_noop              0.20 microseconds
log_simple           84.81 microseconds
log_filtered          6.17 microseconds
log_mitigated         5.72 microseconds
log_disabled          1.21 microseconds
No caller, thread, process info...
log_simple           75.38 microseconds
log_filtered          5.98 microseconds
log_mitigated         6.03 microseconds

vsajip

If I run the latter script, noting that I want only WARNING and more severe messages in the log, then test.log is perhaps as expected:

[2010-09-16 09:31] WARNING: lbprivate: Warning
[2010-09-16 09:31] ERROR: lbprivate: Error
[2010-09-16 09:31] CRITICAL: lbprivate: Critical

but I get spurious output on the console:

Keep this line with the next, no gaps wanted
[2010-09-16 09:31] DEBUG: lbprivate: Debug