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Merged logging cookbook update from 3.2.

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Vinay Sajip 2012-04-08 01:51:29 +01:00
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Doc/howto/logging-cookbook.rst
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@ -1343,3 +1343,231 @@ These are not "true" .gz files, as they are bare compressed data, with no
"container" such as you’d find in an actual gzip file. This snippet is just "container" such as you’d find in an actual gzip file. This snippet is just
for illustration purposes. for illustration purposes.
A more elaborate multiprocessing example
----------------------------------------
The following working example shows how logging can be used with multiprocessing
using configuration files. The configurations are fairly simple, but serve to
illustrate how more complex ones could be implemented in a real multiprocessing
scenario.
In the example, the main process spawns a listener process and some worker
processes. Each of the main process, the listener and the workers have three
separate configurations (the workers all share the same configuration). We can
see logging in the main process, how the workers log to a QueueHandler and how
the listener implements a QueueListener and a more complex logging
configuration, and arranges to dispatch events received via the queue to the
handlers specified in the configuration. Note that these configurations are
purely illustrative, but you should be able to adapt this example to your own
scenario.
Here's the script - the docstrings and the comments hopefully explain how it
works::
import logging
import logging.config
import logging.handlers
from multiprocessing import Process, Queue, Event, current_process
import os
import random
import time
class MyHandler(object):
"""
A simple handler for logging events. It runs in the listener process and
dispatches events to loggers based on the name in the received record,
which then get dispatched, by the logging system, to the handlers
configured for those records.
"""
def handle(self, record):
logger = logging.getLogger(record.name)
# The process name is transformed just to show that it's the listener
# doing the logging to files and console
record.processName = '%s (for %s)' % (current_process().name, record.processName)
logger.handle(record)
def listener_process(q, stop_event, config):
"""
This could be done in the main process, but is just done in a separate
process for illustrative purposes.
This initialises logging according to the specified configuration,
starts the listener and waits for the main process to signal completion
via the event. The listener is then stopped, and the process exits.
"""
logging.config.dictConfig(config)
listener = logging.handlers.QueueListener(q, MyHandler())
listener.start()
if os.name == 'posix':
# On POSIX, the setup logger will have been configured in the
# parent process, but should have been disabled following the
# dictConfig call.
# On Windows, since fork isn't used, the setup logger won't
# exist in the child, so it would be created and the message
# would appear - hence the "if posix" clause.
logger = logging.getLogger('setup')
logger.critical('Should not appear, because of disabled logger ...')
stop_event.wait()
listener.stop()
def worker_process(config):
"""
A number of these are spawned for the purpose of illustration. In
practice, they could be a heterogenous bunch of processes rather than
ones which are identical to each other.
This initialises logging according to the specified configuration,
and logs a hundred messages with random levels to randomly selected
loggers.
A small sleep is added to allow other processes a chance to run. This
is not strictly needed, but it mixes the output from the different
processes a bit more than if it's left out.
"""
logging.config.dictConfig(config)
levels = [logging.DEBUG, logging.INFO, logging.WARNING, logging.ERROR,
logging.CRITICAL]
loggers = ['foo', 'foo.bar', 'foo.bar.baz',
'spam', 'spam.ham', 'spam.ham.eggs']
if os.name == 'posix':
# On POSIX, the setup logger will have been configured in the
# parent process, but should have been disabled following the
# dictConfig call.
# On Windows, since fork isn't used, the setup logger won't
# exist in the child, so it would be created and the message
# would appear - hence the "if posix" clause.
logger = logging.getLogger('setup')
logger.critical('Should not appear, because of disabled logger ...')
for i in range(100):
lvl = random.choice(levels)
logger = logging.getLogger(random.choice(loggers))
logger.log(lvl, 'Message no. %d', i)
time.sleep(0.01)
def main():
q = Queue()
# The main process gets a simple configuration which prints to the console.
config_initial = {
'version': 1,
'formatters': {
'detailed': {
'class': 'logging.Formatter',
'format': '%(asctime)s %(name)-15s %(levelname)-8s %(processName)-10s %(message)s'
}
},
'handlers': {
'console': {
'class': 'logging.StreamHandler',
'level': 'INFO',
},
},
'root': {
'level': 'DEBUG',
'handlers': ['console']
},
}
# The worker process configuration is just a QueueHandler attached to the
# root logger, which allows all messages to be sent to the queue.
# We disable existing loggers to disable the "setup" logger used in the
# parent process. This is needed on POSIX because the logger will
# be there in the child following a fork().
config_worker = {
'version': 1,
'disable_existing_loggers': True,
'handlers': {
'queue': {
'class': 'logging.handlers.QueueHandler',
'queue': q,
},
},
'root': {
'level': 'DEBUG',
'handlers': ['queue']
},
}
# The listener process configuration shows that the full flexibility of
# logging configuration is available to dispatch events to handlers however
# you want.
# We disable existing loggers to disable the "setup" logger used in the
# parent process. This is needed on POSIX because the logger will
# be there in the child following a fork().
config_listener = {
'version': 1,
'disable_existing_loggers': True,
'formatters': {
'detailed': {
'class': 'logging.Formatter',
'format': '%(asctime)s %(name)-15s %(levelname)-8s %(processName)-10s %(message)s'
},
'simple': {
'class': 'logging.Formatter',
'format': '%(name)-15s %(levelname)-8s %(processName)-10s %(message)s'
}
},
'handlers': {
'console': {
'class': 'logging.StreamHandler',
'level': 'INFO',
'formatter': 'simple',
},
'file': {
'class': 'logging.FileHandler',
'filename': 'mplog.log',
'mode': 'w',
'formatter': 'detailed',
},
'foofile': {
'class': 'logging.FileHandler',
'filename': 'mplog-foo.log',
'mode': 'w',
'formatter': 'detailed',
},
'errors': {
'class': 'logging.FileHandler',
'filename': 'mplog-errors.log',
'mode': 'w',
'level': 'ERROR',
'formatter': 'detailed',
},
},
'loggers': {
'foo': {
'handlers' : ['foofile']
}
},
'root': {
'level': 'DEBUG',
'handlers': ['console', 'file', 'errors']
},
}
# Log some initial events, just to show that logging in the parent works
# normally.
logging.config.dictConfig(config_initial)
logger = logging.getLogger('setup')
logger.info('About to create workers ...')
workers = []
for i in range(5):
wp = Process(target=worker_process, name='worker %d' % (i + 1),
args=(config_worker,))
workers.append(wp)
wp.start()
logger.info('Started worker: %s', wp.name)
logger.info('About to create listener ...')
stop_event = Event()
lp = Process(target=listener_process, name='listener',
args=(q, stop_event, config_listener))
lp.start()
logger.info('Started listener')
# We now hang around for the workers to finish their work.
for wp in workers:
wp.join()
# Workers all done, listening can now stop.
# Logging in the parent still works normally.
logger.info('Telling listener to stop ...')
stop_event.set()
lp.join()
logger.info('All done.')
if __name__ == '__main__':
main()