| import logging | |
| from six import PY3 | |
| # Additional log methods | |
| def logger_has_handlers(logger): | |
| """Since Python 2 doesn't provide Logger.hasHandlers(), we have to | |
| perform the lookup by ourself.""" | |
| if PY3: | |
| return logger.hasHandlers() | |
| else: | |
| c = logger | |
| rv = False | |
| while c: | |
| if c.handlers: | |
| rv = True | |
| break | |
| if not c.propagate: | |
| break | |
| else: | |
| c = c.parent | |
| return rv | |
| def get_default_logger(name): | |
| """Get a logger from default logging manager. If no handler | |
| is associated, add a default NullHandler""" | |
| logger = logging.getLogger(name) | |
| if not logger_has_handlers(logger): | |
| # If logging is not configured in the current project, configure | |
| # this logger to discard all logs messages. This will prevent | |
| # the 'No handlers could be found for logger XXX' error on Python 2, | |
| # and avoid redirecting errors to the default 'lastResort' | |
| # StreamHandler on Python 3 | |
| logger.addHandler(logging.NullHandler()) | |
| return logger | |