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""" Logger class. """ from time import time from twisted.python.compat import currentframe from twisted.python.failure import Failure from ._levels import InvalidLogLevelError, LogLevel class Logger(object): """ A L{Logger} emits log messages to an observer. You should instantiate it as a class or module attribute, as documented in L{this module's documentation }. @type namespace: L{str} @ivar namespace: the namespace for this logger @type source: L{object} @ivar source: The object which is emitting events via this logger @type: L{ILogObserver} @ivar observer: The observer that this logger will send events to. """ @staticmethod def _namespaceFromCallingContext(): """ Derive a namespace from the module containing the caller's caller. @return: the fully qualified python name of a module. @rtype: L{str} (native string) """ try: return currentframe(2).f_globals["__name__"] except KeyError: return "" def __init__(self, namespace=None, source=None, observer=None): """ @param namespace: The namespace for this logger. Uses a dotted notation, as used by python modules. If not L{None}, then the name of the module of the caller is used. @type namespace: L{str} (native string) @param source: The object which is emitting events via this logger; this is automatically set on instances of a class if this L{Logger} is an attribute of that class. @type source: L{object} @param observer: The observer that this logger will send events to. If L{None}, use the L{global log publisher }. @type observer: L{ILogObserver} """ if namespace is None: namespace = self._namespaceFromCallingContext() self.namespace = namespace self.source = source if observer is None: from ._global import globalLogPublisher self.observer = globalLogPublisher else: self.observer = observer def __get__(self, oself, type=None): """ When used as a descriptor, i.e.:: # File: athing.py class Something(object): log = Logger() def hello(self): self.log.info("Hello") a L{Logger}'s namespace will be set to the name of the class it is declared on. In the above example, the namespace would be C{athing.Something}. Additionally, its source will be set to the actual object referring to the L{Logger}. In the above example, C{Something.log.source} would be C{Something}, and C{Something().log.source} would be an instance of C{Something}. """ if oself is None: source = type else: source = oself return self.__class__( ".".join([type.__module__, type.__name__]), source, observer=self.observer, ) def __repr__(self): return "<%s %r>" % (self.__class__.__name__, self.namespace) def emit(self, level, format=None, **kwargs): """ Emit a log event to all log observers at the given level. @param level: a L{LogLevel} @param format: a message format using new-style (PEP 3101) formatting. The logging event (which is a L{dict}) is used to render this format string. @param kwargs: additional key/value pairs to include in the event. Note that values which are later mutated may result in non-deterministic behavior from observers that schedule work for later execution. """ if level not in LogLevel.iterconstants(): self.failure( "Got invalid log level {invalidLevel!r} in {logger}.emit().", Failure(InvalidLogLevelError(level)), invalidLevel=level, logger=self, ) return event = kwargs event.update( log_logger=self, log_level=level, log_namespace=self.namespace, log_source=self.source, log_format=format, log_time=time(), ) if "log_trace" in event: event["log_trace"].append((self, self.observer)) self.observer(event) def failure(self, format, failure=None, level=LogLevel.critical, **kwargs): """ Log a failure and emit a traceback. For example:: try: frob(knob) except Exception: log.failure("While frobbing {knob}", knob=knob) or:: d = deferredFrob(knob) d.addErrback(lambda f: log.failure, "While frobbing {knob}", f, knob=knob) This method is generally meant to capture unexpected exceptions in code; an exception that is caught and handled somehow should be logged, if appropriate, via L{Logger.error} instead. If some unknown exception occurs and your code doesn't know how to handle it, as in the above example, then this method provides a means to describe the failure in nerd-speak. This is done at L{LogLevel.critical} by default, since no corrective guidance can be offered to an user/administrator, and the impact of the condition is unknown. @param format: a message format using new-style (PEP 3101) formatting. The logging event (which is a L{dict}) is used to render this format string. @param failure: a L{Failure} to log. If L{None}, a L{Failure} is created from the exception in flight. @param level: a L{LogLevel} to use. @param kwargs: additional key/value pairs to include in the event. Note that values which are later mutated may result in non-deterministic behavior from observers that schedule work for later execution. """ if failure is None: failure = Failure() self.emit(level, format, log_failure=failure, **kwargs) def debug(self, format=None, **kwargs): """ Emit a log event at log level L{LogLevel.debug}. @param format: a message format using new-style (PEP 3101) formatting. The logging event (which is a L{dict}) is used to render this format string. @param kwargs: additional key/value pairs to include in the event. Note that values which are later mutated may result in non-deterministic behavior from observers that schedule work for later execution. """ self.emit(LogLevel.debug, format, **kwargs) def info(self, format=None, **kwargs): """ Emit a log event at log level L{LogLevel.info}. @param format: a message format using new-style (PEP 3101) formatting. The logging event (which is a L{dict}) is used to render this format string. @param kwargs: additional key/value pairs to include in the event. Note that values which are later mutated may result in non-deterministic behavior from observers that schedule work for later execution. """ self.emit(LogLevel.info, format, **kwargs) def warn(self, format=None, **kwargs): """ Emit a log event at log level L{LogLevel.warn}. @param format: a message format using new-style (PEP 3101) formatting. The logging event (which is a L{dict}) is used to render this format string. @param kwargs: additional key/value pairs to include in the event. Note that values which are later mutated may result in non-deterministic behavior from observers that schedule work for later execution. """ self.emit(LogLevel.warn, format, **kwargs) def error(self, format=None, **kwargs): """ Emit a log event at log level L{LogLevel.error}. @param format: a message format using new-style (PEP 3101) formatting. The logging event (which is a L{dict}) is used to render this format string. @param kwargs: additional key/value pairs to include in the event. Note that values which are later mutated may result in non-deterministic behavior from observers that schedule work for later execution. """ self.emit(LogLevel.error, format, **kwargs) def critical(self, format=None, **kwargs): """ Emit a log event at log level L{LogLevel.critical}. @param format: a message format using new-style (PEP 3101) formatting. The logging event (which is a L{dict}) is used to render this format string. @param kwargs: additional key/value pairs to include in the event. Note that values which are later mutated may result in non-deterministic behavior from observers that schedule work for later execution. """ self.emit(LogLevel.critical, format, **kwargs) _log = Logger() _loggerFor = lambda obj:_log.__get__(obj, obj.__class__)