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| """A simple log mechanism styled after PEP 282.""" | |
| # The class here is styled after PEP 282 so that it could later be | |
| # replaced with a standard Python logging implementation. | |
| DEBUG = 1 | |
| INFO = 2 | |
| WARN = 3 | |
| ERROR = 4 | |
| FATAL = 5 | |
| import sys | |
| class Log: | |
| def __init__(self, threshold=WARN): | |
| self.threshold = threshold | |
| def _log(self, level, msg, args): | |
| if level not in (DEBUG, INFO, WARN, ERROR, FATAL): | |
| raise ValueError('%s wrong log level' % str(level)) | |
| if level >= self.threshold: | |
| if args: | |
| msg = msg % args | |
| if level in (WARN, ERROR, FATAL): | |
| stream = sys.stderr | |
| else: | |
| stream = sys.stdout | |
| try: | |
| stream.write('%s\n' % msg) | |
| except UnicodeEncodeError: | |
| # emulate backslashreplace error handler | |
| encoding = stream.encoding | |
| msg = msg.encode(encoding, "backslashreplace").decode(encoding) | |
| stream.write('%s\n' % msg) | |
| stream.flush() | |
| def log(self, level, msg, *args): | |
| self._log(level, msg, args) | |
| def debug(self, msg, *args): | |
| self._log(DEBUG, msg, args) | |
| def info(self, msg, *args): | |
| self._log(INFO, msg, args) | |
| def warn(self, msg, *args): | |
| self._log(WARN, msg, args) | |
| def error(self, msg, *args): | |
| self._log(ERROR, msg, args) | |
| def fatal(self, msg, *args): | |
| self._log(FATAL, msg, args) | |
| _global_log = Log() | |
| log = _global_log.log | |
| debug = _global_log.debug | |
| info = _global_log.info | |
| warn = _global_log.warn | |
| error = _global_log.error | |
| fatal = _global_log.fatal | |
| def set_threshold(level): | |
| # return the old threshold for use from tests | |
| old = _global_log.threshold | |
| _global_log.threshold = level | |
| return old | |
| def set_verbosity(v): | |
| if v <= 0: | |
| set_threshold(WARN) | |
| elif v == 1: | |
| set_threshold(INFO) | |
| elif v >= 2: | |
| set_threshold(DEBUG) | |