8000 Improve the more elaborate multiprocessing example in the logging cookbook by geryogam · Pull Request #9326 · python/cpython · GitHub
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Improve the more elaborate multiprocessing example in the logging cookbook #9326

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merged 1 commit into from
Sep 25, 2018
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Improve the more elaborate multiprocessing example in the logging cookbook #9326

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58 changes: 29 additions & 29 deletions Doc/howto/logging-cookbook.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1456,12 +1456,18 @@ works::
which then get dispatched, by the logging system, to the handlers
configured for those loggers.
"""

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)
if record.name == "root":
logger = logging.getLogger()
else:
logger = logging.getLogger(record.name)

if logger.isEnabledFor(record.levelno):
# 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):
"""
Expand Down Expand Up @@ -1526,22 +1532,16 @@ works::
# 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',
},
'level': 'INFO'
}
},
'root': {
'level': 'DEBUG',
'handlers': ['console']
},
'handlers': ['console'],
'level': 'DEBUG'
}
}
# The worker process configuration is just a QueueHandler attached to the
# root logger, which allows all messages to be sent to the queue.
Expand All @@ -1554,13 +1554,13 @@ works::
'handlers': {
'queue': {
'class': 'logging.handlers.QueueHandler',
'queue': q,
},
'queue': q
}
},
'root': {
'level': 'DEBUG',
'handlers': ['queue']
},
'handlers': ['queue'],
'level': 'DEBUG'
}
}
# The listener process configuration shows that the full flexibility of
# logging configuration is available to dispatch events to handlers however
Expand All @@ -1584,38 +1584,38 @@ works::
'handlers': {
'console': {
'class': 'logging.StreamHandler',
'level': 'INFO',
'formatter': 'simple',
'level': 'INFO'
},
'file': {
'class': 'logging.FileHandler',
'filename': 'mplog.log',
'mode': 'w',
'formatter': 'detailed',
'formatter': 'detailed'
},
'foofile': {
'class': 'logging.FileHandler',
'filename': 'mplog-foo.log',
'mode': 'w',
'formatter': 'detailed',
'formatter': 'detailed'
},
'errors': {
'class': 'logging.FileHandler',
'filename': 'mplog-errors.log',
'mode': 'w',
'level': 'ERROR',
'formatter': 'detailed',
},
'level': 'ERROR'
}
},
'loggers': {
'foo': {
'handlers': ['foofile']
}
},
'root': {
'level': 'DEBUG',
'handlers': ['console', 'file', 'errors']
},
'handlers': ['console', 'file', 'errors'],
'level': 'DEBUG'
}
}
# Log some initial events, just to show that logging in the parent works
# normally.
Expand Down
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