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""" Filtering log observer. """ from functools import partial from zope.interface import Interface, implementer from constantly import NamedConstant, Names from ._levels import InvalidLogLevelError, LogLevel from ._observer import ILogObserver class PredicateResult(Names): """ Predicate results. @see: L{LogLevelFilterPredicate} @cvar yes: Log the specified event. When this value is used, L{FilteringLogObserver} will always log the message, without evaluating other predicates. @cvar no: Do not log the specified event. When this value is used, L{FilteringLogObserver} will I{not} log the message, without evaluating other predicates. @cvar maybe: Do not have an opinion on the event. When this value is used, L{FilteringLogObserver} will consider subsequent predicate results; if returned by the last predicate being considered, then the event will be logged. """ yes = NamedConstant() no = NamedConstant() maybe = NamedConstant() class ILogFilterPredicate(Interface): """ A predicate that determined whether an event should be logged. """ def __call__(event): """ Determine whether an event should be logged. @returns: a L{PredicateResult}. """ def shouldLogEvent(predicates, event): """ Determine whether an event should be logged, based on the result of C{predicates}. By default, the result is C{True}; so if there are no predicates, everything will be logged. If any predicate returns C{yes}, then we will immediately return C{True}. If any predicate returns C{no}, then we will immediately return C{False}. As predicates return C{maybe}, we keep calling the next predicate until we run out, at which point we return C{True}. @param predicates: The predicates to use. @type predicates: iterable of L{ILogFilterPredicate} @param event: An event @type event: L{dict} @return: True if the message should be forwarded on, C{False} if not. @rtype: L{bool} """ for predicate in predicates: result = predicate(event) if result == PredicateResult.yes: return True if result == PredicateResult.no: return False if result == PredicateResult.maybe: continue raise TypeError("Invalid predicate result: {0!r}".format(result)) return True @implementer(ILogObserver) class FilteringLogObserver(object): """ L{ILogObserver} that wraps another L{ILogObserver}, but filters out events based on applying a series of L{ILogFilterPredicate}s. """ def __init__( self, observer, predicates, negativeObserver=lambda event: None ): """ @param observer: An observer to which this observer will forward events when C{predictates} yield a positive result. @type observer: L{ILogObserver} @param predicates: Predicates to apply to events before forwarding to the wrapped observer. @type predicates: ordered iterable of predicates @param negativeObserver: An observer to which this observer will forward events when C{predictates} yield a negative result. @type negativeObserver: L{ILogObserver} """ self._observer = observer self._shouldLogEvent = partial(shouldLogEvent, list(predicates)) self._negativeObserver = negativeObserver def __call__(self, event): """ Forward to next observer if predicate allows it. """ if self._shouldLogEvent(event): if "log_trace" in event: event["log_trace"].append((self, self.observer)) self._observer(event) else: self._negativeObserver(event) @implementer(ILogFilterPredicate) class LogLevelFilterPredicate(object): """ L{ILogFilterPredicate} that filters out events with a log level lower than the log level for the event's namespace. Events that not not have a log level or namespace are also dropped. """ def __init__(self, defaultLogLevel=LogLevel.info): """ @param defaultLogLevel: The default minimum log level. @type defaultLogLevel: L{LogLevel} """ self._logLevelsByNamespace = {} self.defaultLogLevel = defaultLogLevel self.clearLogLevels() def logLevelForNamespace(self, namespace): """ Determine an appropriate log level for the given namespace. This respects dots in namespaces; for example, if you have previously invoked C{setLogLevelForNamespace("mypackage", LogLevel.debug)}, then C{logLevelForNamespace("mypackage.subpackage")} will return C{LogLevel.debug}. @param namespace: A logging namespace, or L{None} for the default namespace. @type namespace: L{str} (native string) @return: The log level for the specified namespace. @rtype: L{LogLevel} """ if not namespace: return self._logLevelsByNamespace[None] if namespace in self._logLevelsByNamespace: return self._logLevelsByNamespace[namespace] segments = namespace.split(".") index = len(segments) - 1 while index > 0: namespace = ".".join(segments[:index]) if namespace in self._logLevelsByNamespace: return self._logLevelsByNamespace[namespace] index -= 1 return self._logLevelsByNamespace[None] def setLogLevelForNamespace(self, namespace, level): """ Sets the log level for a logging namespace. @param namespace: A logging namespace. @type namespace: L{str} (native string) @param level: The log level for the given namespace. @type level: L{LogLevel} """ if level not in LogLevel.iterconstants(): raise InvalidLogLevelError(level) if namespace: self._logLevelsByNamespace[namespace] = level else: self._logLevelsByNamespace[None] = level def clearLogLevels(self): """ Clears all log levels to the default. """ self._logLevelsByNamespace.clear() self._logLevelsByNamespace[None] = self.defaultLogLevel def __call__(self, event): eventLevel = event.get("log_level", None) namespace = event.get("log_namespace", None) namespaceLevel = self.logLevelForNamespace(namespace) if ( eventLevel is None or namespace is None or LogLevel._priorityForLevel(eventLevel) < LogLevel._priorityForLevel(namespaceLevel) ): return PredicateResult.no return PredicateResult.maybe