On Monday, February 22, 2021 at 11:15:27 AM UTC+5:30, Chris Angelico wrote:
> On Mon, Feb 22, 2021 at 4:41 PM gayatri funde <[email protected]> wrote:
> >
> > On Monday, February 22, 2021 at 10:47:57 AM UTC+5:30, Dan Stromberg wrote:
> > > On Sun, Feb 21, 2021 at 9:10 PM gayatri funde <[email protected]>
> > > wrote:
> > > > Hello,
> > > >
> > > > Greetings!! Have a good day!
> > > >
> > > > This is regarding logging issue i am facing in my application. My
> > > > requirement is to create log on daily basis while my application is
> > > > running, So to do this i am creating new log file at midnight by
> > > > comparing
> > > > the day it starts and enter to new day with the while loop continuously
> > > > checking on date.
> > > >
> > > > In my application i have 2 processes, So what my observation is on the
> > > > day
> > > > of start of application both process are able to log into the file, but
> > > > as
> > > > new day starts new file getting created and only main process log are
> > > > getting written into new file, and other process is still writing to
> > > > old
> > > > day log.
> > > >
> > > > So could you please help me to understand this issue and it will be
> > > > great
> > > > to know solution if you can help me with this.
> > > >
> > > Is it possible each process has open a different "file" on the same
> > > pathname, with only one actually being visible in the filesystem?
> > >
> > > Linuxes and Unixes allow such things. I am unaware of Windows being
> > > powerful enough to do so, and besides there you'd probably use the Event
> > > Log anyway.
> > >
> > > If that's the case, I do not know of a Python logging-module way of
> > > correcting the problem, but you could introduce a third process that is
> > > used just for logging, and have the original two send their log messages
> > > to
> > > the new 3rd logging process.
> >
> >
> > Just to clarify, file names are different as i am appending date to each
> > file name. On new day start main process is writing to new day file and
> > another process is still writing to old date file. This i am trying on
> > Linux system.
> >
> > Thanks for suggestion of creating one dedicated process for logging. But if
> > you can help to find any is other reason why second process not able to
> > find the new day file handler object.
> > Thank you for your reply.
> >
> You'll need to show your code. Most likely, though, BOTH processes
> need to independently update to the new file.
>
> ChrisA
I have 2 files mainModule.py and loggingModule.py files as below:
In loggingModule.py file i am managing new log to create , which i am importing
to mainModule.py file.
loggingModule.py
import logging
import os, sys
import os.path
import datetime
from threading import Thread
import time
firstTime = "false"
def initialize_logger(fileName):
global firstTime
try:
logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
output_dir = os.getcwd()
if firstTime == "true":
for handler in logger.handlers[:]: # get rid of existing old
handlers
logger.removeHandler(handler)
# create debug file handler and set level to debug
try:
handler = logging.FileHandler(os.path.join(output_dir, fileName),
"w")
except:
print("problem to create log")
handler.setLevel(logging.DEBUG)
formatter = logging.Formatter("[%(levelname)s] (%(threadName)-30s)
%(asctime)s %(message)s ")
handler.setFormatter(formatter)
logger.addHandler(handler)
firstTime = "true"
except Exception as ex:
exc_type, exc_obj, tb = sys.exc_info()
template = "An exception of type {0} occurred at {1}. Arguments:\n{2!r}"
message = template.format(type(ex).__name__, tb.tb_lineno, ex.args)
logging.error(message)
def daily_log():
global firstTime
try:
now = datetime.datetime.now()
log_day = now.day
initialize_logger("Log_start.log")
while True:
currentDate = datetime.datetime.now().day
time.sleep(60)
if currentDate != log_day: # New day started
initialize_logger("Log_continue.log")
except Exception as ex:
exc_type, exc_obj, tb = sys.exc_info()
template = "An exception of type {0} occurred at {1}. Arguments:\n{2!r}"
message = template.format(type(ex).__name__, tb.tb_lineno, ex.args)
logging.error(message)
daily_log()
mainModule.py
import Logic_Check
import logging
import multiprocessing
from loggingModule import *
def child_Process(var1):
while True:
time.sleep(10)
logging.info('Log from Child Process')
if __name__ == "__main__":
var1 = "LotsOfSunshine"
time.sleep(1)
logging.info("Log from Main process")
child_Multiprocess = multiprocessing.Process(target=child_Process,
args=(var1,))
child_Multiprocess.start()
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