[英]Logging with Multiprocessing in python
我目前正在努力使一个简单的多处理日志工作:
我正在从以下答案中使用MultiProcessingLog
: https : //stackoverflow.com/a/894284/293195
我有一个简单的ConverterImage
,它应该能够吐出日志,该日志有效,但是异常和tracelog永远不会出现在日志中? 有人知道这是什么问题吗?
import os, traceback,logging
import multiprocessing, threading, logging, sys, traceback
from multiprocessing import Pool, Manager
from logging import FileHandler
class MultiProcessingLog(logging.Handler):
def __init__(self, name, mode):
logging.Handler.__init__(self)
self._handler = FileHandler(name, mode)
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)
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)
class ConvertImage:
def __init__(self, logger=None):
self.logger = logger
def __call__(self,f):
self.process(f)
def process(self,f):
try:
logging.info("Process %i" % os.getpid() )
raise NameError("Stupid error")
except Exception as e:
logging.info("Exception: " + e.message)
exc_buffer = io.StringIO()
traceback.print_exc(file=exc_buffer)
logging.info(exc_buffer.getvalue())
raise e
except:
logging.info("Exception!")
exc_buffer = io.StringIO()
traceback.print_exc(file=exc_buffer)
logging.info(exc_buffer.getvalue())
raise
mpl = MultiProcessingLog("ImageProcessing.log", mode='w+')
mpl.setFormatter( logging.Formatter('%(asctime)s - %(lineno)d - %(levelname)-8s - %(message)s') )
logger = logging.getLogger()
logger.addHandler(mpl)
logger.setLevel(logging.DEBUG)
pool = Pool();
converter = ConvertImage()
# map converter.process function over all files
result = pool.map_async(converter, ["A","B","C"]);
pool.close();
pool.join()
logging.shutdown()
在ConvertImage中,您使用日志记录模块函数而不是self.logger方法。 您可以尝试下面的代码吗?
def process(self,f):
try:
self.logger.info("Process %i" % os.getpid() )
raise NameError("Stupid error")
except Exception as e:
self.logger.info("Exception: " + e.message)
exc_buffer = io.StringIO()
traceback.print_exc(file=exc_buffer)
self.logger.info(exc_buffer.getvalue())
raise e
except:
self.logger.info("Exception!")
exc_buffer = io.StringIO()
traceback.print_exc(file=exc_buffer)
self.logger.info(exc_buffer.getvalue())
raise
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