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# -*- test-case-name: twisted.logger.test.test_global -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ This module includes process-global state associated with the logging system, and implementation of logic for managing that global state. """ import sys import warnings from typing import IO, Any, Iterable, Optional, Type from twisted.python.compat import currentframe from twisted.python.reflect import qual from ._buffer import LimitedHistoryLogObserver from ._file import FileLogObserver from ._filter import FilteringLogObserver, LogLevelFilterPredicate from ._format import eventAsText from ._interfaces import ILogObserver from ._io import LoggingFile from ._levels import LogLevel from ._logger import Logger from ._observer import LogPublisher MORE_THAN_ONCE_WARNING = ( "Warning: primary log target selected twice at <{fileNow}:{lineNow}> - " "previously selected at <{fileThen}:{lineThen}>. Remove one of the calls " "to beginLoggingTo." ) class LogBeginner: """ A L{LogBeginner} holds state related to logging before logging has begun, and begins logging when told to do so. Logging "begins" when someone has selected a set of observers, like, for example, a L{FileLogObserver} that writes to a file on disk, or to standard output. Applications will not typically need to instantiate this class, except those which intend to initialize the global logging system themselves, which may wish to instantiate this for testing. The global instance for the current process is exposed as L{twisted.logger.globalLogBeginner}. Before logging has begun, a L{LogBeginner} will: 1. Log any critical messages (e.g.: unhandled exceptions) to the given file-like object. 2. Save (a limited number of) log events in a L{LimitedHistoryLogObserver}. @cvar _DEFAULT_BUFFER_SIZE: The default size for the initial log events buffer. @ivar _initialBuffer: A buffer of messages logged before logging began. @ivar _publisher: The log publisher passed in to L{LogBeginner}'s constructor. @ivar _log: The logger used to log messages about the operation of the L{LogBeginner} itself. @ivar _stdio: An object with C{stderr} and C{stdout} attributes (like the L{sys} module) which will be replaced when redirecting standard I/O. @ivar _temporaryObserver: If not L{None}, an L{ILogObserver} that observes events on C{_publisher} for this L{LogBeginner}. """ _DEFAULT_BUFFER_SIZE = 200 def __init__( self, publisher: LogPublisher, errorStream: IO[Any], stdio: object, warningsModule: Any, initialBufferSize: Optional[int] = None, ) -> None: """ Initialize this L{LogBeginner}. @param initialBufferSize: The size of the event buffer into which events are collected until C{beginLoggingTo} is called. Or C{None} to use the default size. """ if initialBufferSize is None: initialBufferSize = self._DEFAULT_BUFFER_SIZE self._initialBuffer = LimitedHistoryLogObserver(size=initialBufferSize) self._publisher = publisher self._log = Logger(observer=publisher) self._stdio = stdio self._warningsModule = warningsModule self._temporaryObserver: Optional[ILogObserver] = LogPublisher( self._initialBuffer, FilteringLogObserver( FileLogObserver( errorStream, lambda event: eventAsText( event, includeTimestamp=False, includeSystem=False, ) + "\n", ), [LogLevelFilterPredicate(defaultLogLevel=LogLevel.critical)], ), ) self._previousBegin = ("", 0) publisher.addObserver(self._temporaryObserver) self._oldshowwarning = warningsModule.showwarning def beginLoggingTo( self, observers: Iterable[ILogObserver], discardBuffer: bool = False, redirectStandardIO: bool = True, ) -> None: """ Begin logging to the given set of observers. This will: 1. Add all the observers given in C{observers} to the L{LogPublisher} associated with this L{LogBeginner}. 2. Optionally re-direct standard output and standard error streams to the logging system. 3. Re-play any messages that were previously logged to that publisher to the new observers, if C{discardBuffer} is not set. 4. Stop logging critical errors from the L{LogPublisher} as strings to the C{errorStream} associated with this L{LogBeginner}, and allow them to be logged normally. 5. Re-direct warnings from the L{warnings} module associated with this L{LogBeginner} to log messages. @note: Since a L{LogBeginner} is designed to encapsulate the transition between process-startup and log-system-configuration, this method is intended to be invoked I{once}. @param observers: The observers to register. @param discardBuffer: Whether to discard the buffer and not re-play it to the added observers. (This argument is provided mainly for compatibility with legacy concerns.) @param redirectStandardIO: If true, redirect standard output and standard error to the observers. """ caller = currentframe(1) filename = caller.f_code.co_filename lineno = caller.f_lineno for observer in observers: self._publisher.addObserver(observer) if self._temporaryObserver is not None: self._publisher.removeObserver(self._temporaryObserver) if not discardBuffer: self._initialBuffer.replayTo(self._publisher) self._temporaryObserver = None self._warningsModule.showwarning = self.showwarning else: previousFile, previousLine = self._previousBegin self._log.warn( MORE_THAN_ONCE_WARNING, fileNow=filename, lineNow=lineno, fileThen=previousFile, lineThen=previousLine, ) self._previousBegin = (filename, lineno) if redirectStandardIO: streams = [("stdout", LogLevel.info), ("stderr", LogLevel.error)] else: streams = [] for stream, level in streams: oldStream = getattr(self._stdio, stream) loggingFile = LoggingFile( logger=Logger(namespace=stream, observer=self._publisher), level=level, encoding=getattr(oldStream, "encoding", None), ) setattr(self._stdio, stream, loggingFile) def showwarning( self, message: str, category: Type[Warning], filename: str, lineno: int, file: Optional[IO[Any]] = None, line: Optional[str] = None, ) -> None: """ Twisted-enabled wrapper around L{warnings.showwarning}. If C{file} is L{None}, the default behaviour is to emit the warning to the log system, otherwise the original L{warnings.showwarning} Python function is called. @param message: A warning message to emit. @param category: A warning category to associate with C{message}. @param filename: A file name for the source code file issuing the warning. @param lineno: A line number in the source file where the warning was issued. @param file: A file to write the warning message to. If L{None}, write to L{sys.stderr}. @param line: A line of source code to include with the warning message. If L{None}, attempt to read the line from C{filename} and C{lineno}. """ if file is None: self._log.warn( "{filename}:{lineno}: {category}: {warning}", warning=message, category=qual(category), filename=filename, lineno=lineno, ) else: self._oldshowwarning(message, category, filename, lineno, file, line) globalLogPublisher = LogPublisher() globalLogBeginner = LogBeginner(globalLogPublisher, sys.stderr, sys, warnings)