gnews/utility/log.py

# -*- coding: utf-8 -*-
import os
import sys
from logging import DEBUG
from logging import Formatter
from logging import StreamHandler
from logging import getLogger
from logging.handlers import RotatingFileHandler


def init_logging(module_name, log_file, level=DEBUG, max_bytes=65536000,
                 backup_count=3):
    """get the logger for the module_name and the log_file
    Args:
        module_name (str): the module name
        log_file (str): the log file
        level:
        max_bytes: 65536000, 64MB
        backup_count:
    Returns:
        Logger: the logger   
    """
    
    logger = getLogger(module_name)
    if logger.handlers:
        return logger
    logger.setLevel(level)
    logger.propagate = True
    handler = RotatingFileHandler(
        filename=log_file, maxBytes=max_bytes, backupCount=backup_count)
    formatter = Formatter("%(asctime)s %(levelname)s %(name)s: %(message)s")
    handler.setFormatter(formatter)
    logger.addHandler(handler)
    handler = StreamHandler(sys.stdout)
    handler.setFormatter(formatter)
    logger.addHandler(handler)
    return logger