Call a function everytime logging module in python is called

Question

I would like to call a function everytime, I do any sort of logging using the logging module in python.

As can be seen below, instead of calling copyfiles at each instance of logging, I would like to see if there is way to injest copyfiles to the filehandler in someway or even a wrapper.

from sys import argv
import shutil
import logging
logger = logging.getLogger('')

sh = logging.StreamHandler(sys.stdout)
logfile = 'logs/log-run-{}.log'.format(date.today().strftime('%d-%m-%Y'))
fh = logging.FileHandler(logfile)

formatter = logging.Formatter('[%(asctime)s] %(levelname)s \
                            [%(filename)s.%(funcName)s:%(lineno)d] \
                            %(message)s', datefmt='%a, %d %b %Y %H:%M:%S')
logger.setLevel(logging.INFO)

sh.setFormatter(formatter)
fh.setFormatter(formatter)

logger.addHandler(sh)
logger.addHandler(fh)

LOGPATH = args[1]
def copyfiles():
    """
    Copy files to azure blob storage
    """
    fh.flush()
    shutil.copy(logfile, LOGPATH)

logging.info('test')
copyfiles()
logging.info('foobar')
copyfiles()

I tried digging into invoking copyfiles each time logging is called, but I ended up no where.

In case you are wondering why I am copy files from logging, this is why.

Answer 1

Currently this is what I could think of:

• Override the flush() of FileHandler by inheriting it into a utility class like FlushCopyFileHandler class shown in the code below.
• Instead of using the FileHandler use the FlushCopyFileHandler class and all you have to do is call this overridden flush().

"""

from logging import FileHandler
from shutil

class FlushCopyFileHandler(FileHandler):
    
    # These arguments are passed along to the parent class FileHandler.
    def __init__(self, *args, **kwargs):
        super(FlushCopyFileHandler, self).__init__(filename, *args, **kwargs)
        self.copy_destination = "some default destination path"   # can also be set from args.
        
    # When this flush() is called it will call the flush() of FileHandler class.
    # After that it will call the shutil.copy() method.
    def flush(self):
        super().flush()
        shutil.copy(self.filename, self.copy_destination)
        
    # Use this to change destination path later on.
    def set_copy_path(self, destination):
        self.copy_destination = destination 

"""