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python2 MultiProcess Log
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--- | |
version: 1 | |
disable_existing_loggers: False | |
formatters: | |
simple: | |
format: "%(name)-20s%(levelname)-8s%(message)s" | |
handlers: | |
console: | |
class: logging.StreamHandler | |
level: DEBUG | |
formatter: simple | |
stream: ext://sys.stdout | |
mplog: | |
class: mplog.MultiProcessingLog | |
level: DEBUG | |
formatter: simple | |
name: mplog.log | |
mode: a | |
maxsize: 1024 | |
rotate: 0 | |
root: | |
level: DEBUG | |
handlers: [console, mplog] |
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from logging.handlers import RotatingFileHandler | |
import multiprocessing, threading, logging, sys, traceback | |
import os | |
class MultiProcessingLog(logging.Handler): | |
def __init__(self, name, mode, maxsize, rotate): | |
logging.Handler.__init__(self) | |
self._handler = RotatingFileHandler(name, mode, maxsize, rotate) | |
self.queue = multiprocessing.Queue(-1) | |
t = threading.Thread(target=self.receive) | |
t.daemon = True | |
t.start() | |
def setFormatter(self, fmt): | |
logging.Handler.setFormatter(self, fmt) | |
self._handler.setFormatter(fmt) | |
def receive(self): | |
while True: | |
try: | |
record = self.queue.get() | |
self._handler.emit(record) | |
print('received on pid {}'.format(os.getpid())) | |
except (KeyboardInterrupt, SystemExit): | |
raise | |
except EOFError: | |
break | |
except: | |
traceback.print_exc(file=sys.stderr) | |
def send(self, s): | |
self.queue.put_nowait(s) | |
def _format_record(self, record): | |
# ensure that exc_info and args have been stringified. Removes any | |
# chance of unpickleable things inside and possibly reduces message size | |
# sent over the pipe | |
if record.args: | |
record.msg = record.msg % record.args | |
record.args = None | |
if record.exc_info: | |
dummy = self.format(record) | |
record.exc_info = None | |
return record | |
def emit(self, record): | |
try: | |
s = self._format_record(record) | |
self.send(s) | |
except (KeyboardInterrupt, SystemExit): | |
raise | |
except: | |
self.handleError(record) | |
def close(self): | |
self._handler.close() | |
logging.Handler.close(self) |
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subproc INFO [20728] value begin | |
subproc INFO [20731] value 1 | |
subproc INFO [20732] value 2 | |
subproc INFO [20733] value 3 | |
subproc INFO [20734] value 4 | |
subproc INFO [20728] value end |
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import logging | |
from multiprocessing import Pool | |
import os | |
from subproc import test | |
logger = logging.getLogger(__name__) | |
if __name__ == '__main__': | |
import logging.config | |
import yaml | |
path = 'logging.yaml' | |
if os.path.exists(path): | |
with open(path, 'rt') as f: | |
config = yaml.load(f.read()) | |
logging.config.dictConfig(config) | |
test('begin') | |
p = Pool(4) | |
p.map(test, [1, 2, 3, 4]) | |
test('end') |
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import logging | |
import os | |
logger = logging.getLogger(__name__) | |
def test(value): | |
msg = '[{}] value {}'.format(os.getpid(), value) | |
logger.info(msg) |
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