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loggers.py
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loggers.py
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import logging
import os
import sys
import time
DEFAULT_LOG_FORMAT = ["%(asctime)s", "%(name)s", "%(levelname)s", "%(message)s"]
class BaseLogger(logging.getLoggerClass()):
# can configure level=logging.[CRITICAL(50), FATAL(CRITICAL), ERROR(40), WARNING(30), WARN(WARNING)
# INFO(20), DEBUG(10), NOTSET(0 - default)]
# for various log_format options see help(logging.Formatter)
def __init__(self, name=None, level=logging.NOTSET, log_format=None):
if log_format is None:
log_format = DEFAULT_LOG_FORMAT
if name is None:
log_format = log_format[:1] + log_format[2:]
log_format = " - ".join(log_format)
if name is None:
name = type(self).__name__
super(BaseLogger, self).__init__(name, level=level)
# create formatter
self.formatter = logging.Formatter(log_format)
def _set_format(self, *args, **kwargs):
self.formatter = logging.Formatter(*args, **kwargs)
list(map(lambda handler: handler.setFormatter(self.formatter), self.handlers))
def _initialize_handler(self):
list(map(lambda handler: handler.setLevel(self.level), self.handlers))
# attach formatter to handlers
list(map(lambda handler: handler.setFormatter(self.formatter), self.handlers))
def close(self):
logging.shutdown([x.__weakref__ for x in self.handlers])
class FileLogger(BaseLogger):
def __init__(self, filename, *args, ext="log", path="logs", add_timestamp=False, should_overwrite=True, **kwargs):
super(FileLogger, self).__init__(*args, **kwargs)
if not os.path.exists(path):
os.makedirs(path)
filename = os.path.join(path, filename)
if add_timestamp:
filename += time.strftime("-%Y-%m-%d-%H%M%S")
mode = 'w' if should_overwrite else 'a'
self.addHandler(logging.FileHandler("%s.%s" % (filename, ext,), mode=mode))
self._initialize_handler()
class CSVLogger(FileLogger):
def __init__(self, *args, **kwargs):
if "ext" not in kwargs:
kwargs["ext"] = "csv"
kwargs["log_format"] = "%(message)s"
self._delimiter = kwargs.pop("delimiter", ",")
self._other_del = kwargs.pop("other_delimiter", "-")
super(CSVLogger, self).__init__(*args, **kwargs)
def space(self, num_spaces=1):
self.info("\n" * num_spaces)
def info(self, *args):
args = [arg.replace(self._delimiter, self._other_del).replace(" ", "") if self._delimiter in arg else arg
for arg in map(str, args)]
super(CSVLogger, self).info(self._delimiter.join(args))
class PrintLogger(BaseLogger):
def __init__(self, *args, **kwargs):
super(PrintLogger, self).__init__(*args, **kwargs)
self.addHandler(logging.StreamHandler(stream=sys.stdout)) # create console handler
self._initialize_handler()
class EmptyLogger(BaseLogger):
def __init__(self, *args, **kwargs):
super(EmptyLogger, self).__init__(*args, **kwargs)
self.addHandler(logging.NullHandler())
self._initialize_handler()
# self.disabled = True
def multi_logger(loggers, name="MultiLogger"):
res = BaseLogger(name)
for logger in loggers:
for handler in logger.handlers:
res.addHandler(handler)
return res
if __name__ == "__main__":
# loggers_list = [FileLogger("temp_file"), PrintLogger("test_me")]
# i = multi_logger(loggers_list)
log = PrintLogger()
log.info("bla")
print("Bla")
# MetaClass perfect explanation:
# http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python/6581949#6581949
# class LoggedTestCase(unittest.TestCase):
# __metaclass__ = LogThisTestCase
# logger = logging.getLogger("unittestLogger")
# logger.setLevel(logging.DEBUG) # or whatever you prefer