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Logging and metrics infrastructure.
� )�division�absolute_importN)�datetime)� Interface)�unicode�_PY3)�context)�reflect)�util)�failure)� _oldStyle)� synchronize)�Logger�LogLevel�STDLibLogObserver�LegacyLogObserverWrapper� LoggingFile� LogPublisher�globalLogPublisher�globalLogBeginner)� LogBeginner)�publishToNewObserverc @ s e Zd ZdZdS )� ILogContextz�
Actually, this interface is just a synonym for the dictionary interface,
but it serves as a key for the default information in a log.
I do not inherit from C{Interface} because the world is a cruel place.
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An observer which can do something with log events.
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Log an event.
@type eventDict: C{dict} with C{str} keys.
@param eventDict: A dictionary with arbitrary keys. However, these
keys are often available:
- C{message}: A C{tuple} of C{str} containing messages to be
logged.
- C{system}: A C{str} which indicates the "system" which is
generating this event.
- C{isError}: A C{bool} indicating whether this event represents
an error.
- C{failure}: A L{failure.Failure} instance
- C{why}: Used as header of the traceback in case of errors.
- C{format}: A string format used in place of C{message} to
customize the event. The intent is for the observer to format
a message by doing something like C{format % eventDict}.
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Utility method which wraps a function in a try:/except:, logs a failure if
one occurs, and uses the system's logPrefix.
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Write a failure to the log.
The C{_stuff} and C{_why} parameters use an underscore prefix to lessen
the chance of colliding with a keyword argument the application wishes
to pass. It is intended that they be supplied with arguments passed
positionally, not by keyword.
@param _stuff: The failure to log. If C{_stuff} is L{None} a new
L{Failure} will be created from the current exception state. If
C{_stuff} is an C{Exception} instance it will be wrapped in a
L{Failure}.
@type _stuff: L{None}, C{Exception}, or L{Failure}.
@param _why: The source of this failure. This will be logged along with
C{_stuff} and should describe the context in which the failure
occurred.
@type _why: C{str}
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This represents a class which may 'own' a log. Used by subclassing.
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Override this method to insert custom logging behavior. Its
return value will be inserted in front of every line. It may
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Class for singleton log message publishing.
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� NewPublisher�_observerPublisher�_publishPublisher�_legacyObservers� addObserverr �NullFile�sys�warnings� _logBeginner�_warningsModule� showwarning�_oldshowwarning)r: �observerPublisher�publishPublisher� logBeginnerZwarningsModuleZbeginnerPublisherr r r �__init__� s&
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Property returning all observers registered on this L{LogPublisher}.
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@rtype: L{list} of L{callable}
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Begin logging to the L{LogBeginner} associated with this
L{LogPublisher}.
@param other: the observer to log to.
@type other: L{LogBeginner}
@param setStdout: if true, send standard I/O to the observer as well.
@type setStdout: L{bool}
TN)r r> �appendrC ZbeginLoggingTo)r: �other� setStdout�wrappedr r r �
_startLogging� s zLogPublisher._startLoggingc C s | j j| jkr| j| j _dS )z�
Clean-up hook for fixing potentially global state. Only for testing of
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Add a new observer.
@type other: Provider of L{ILogObserver}
@param other: A callable object that will be called with each new log
message (a dict).
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Remove an observer.
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Log a new message.
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Unicode on Python 3. For compatibility with both use the native string
syntax, for example::
>>> log.msg('Hello, world.')
You MUST avoid passing in Unicode on Python 2, and the form::
>>> log.msg('Hello ', 'world.')
This form only works (sometimes) by accident.
Keyword arguments will be converted into items in the event
dict that is passed to L{ILogObserver} implementations.
Each implementation, in turn, can define keys that are used
by it specifically, in addition to common keys listed at
L{ILogObserver.__call__}.
For example, to set the C{system} parameter while logging
a message::
>>> log.msg('Started', system='Foo')
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A decorator that returns its argument rather than the thing it is
decorating.
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constant as an object with a docstring and thereby document it and
allow references to it statically.
@param something: An object to create an alias for.
@type something: L{object}
@return: a 1-argument callable that returns C{something}
@rtype: L{object}
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Add a log observer to the global publisher.
@see: L{LogPublisher.addObserver}
@param observer: a log observer
@type observer: L{callable}
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Remove a log observer from the global publisher.
@see: L{LogPublisher.removeObserver}
@param observer: a log observer previously added with L{addObserver}
@type observer: L{callable}
Nr rc r r r rW L s rW c O s dS )a?
Publish a message to the global log publisher.
@see: L{LogPublisher.msg}
@param message: the log message
@type message: C{tuple} of L{str} (native string)
@param event: fields for the log event
@type event: L{dict} mapping L{str} (native string) to L{object}
Nr )rY Zeventr r r r6 X s r6 c C s dS )zw
Publish a Python warning through the global log publisher.
@see: L{LogPublisher.showwarning}
Nr r r r r rE g s rE c C s� z | | }W n^ t k
r" � Y nJ zd| |f }W n, zd| f }W n d}Y nX Y nX Y nX tr�t|t�r�|�d�}nt|t�r�|�d�}|S )a�
Try to format a string, swallowing all errors to always return a string.
@note: For backward-compatibility reasons, this function ensures that it
returns a native string, meaning C{bytes} in Python 2 and C{unicode} in
Python 3.
@param fmtString: a C{%}-format string
@param fmtDict: string formatting arguments for C{fmtString}
@return: A native string, formatted from C{fmtString} and C{fmtDict}.
@rtype: L{str}
zDInvalid format string or unformattable object in log message: %r, %sz=UNFORMATTABLE OBJECT WRITTEN TO LOG with fmt %r, MESSAGE LOSTzJPATHOLOGICAL ERROR IN BOTH FORMAT STRING AND MESSAGE DETAILS, MESSAGE LOSTzutf-8)r. r r5 �bytes�decoder �encode)Z fmtString�fmtDict�textr r r � _safeFormatq s, ��
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Extract text from an event dict passed to a log observer. If it cannot
handle the dict, it returns None.
The possible keys of eventDict are:
- C{message}: by default, it holds the final text. It's required, but can
be empty if either C{isError} or C{format} is provided (the first
having the priority).
- C{isError}: boolean indicating the nature of the event.
- C{failure}: L{failure.Failure} instance, required if the event is an
error.
- C{why}: if defined, used as header of the traceback in case of errors.
- C{format}: string format used in place of C{message} to customize
the event. It uses all keys present in C{eventDict} to format
the text.
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�format� ) r% r Zsafe_strZ getTracebackr7 �strri �join�map)r Zedmr3 � traceback�erh r r r r\ � s"
r\ c @ s e Zd ZdZdd� Zdd� ZdS )�_GlobalStartStopMixInzB
Mix-in for global log observers that can start and stop.
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Start observing log events.
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Stop observing log events.
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� ZdS ) �FileLogObserverz�
Log observer that writes to a file-like object.
@type timeFormat: C{str} or L{None}
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Nc C s |j | _ |j| _d S r$ )�write�flush)r: �fr r r rJ � s zFileLogObserver.__init__c C s$ t �|�t �|� }|jd |j S )a*
Return the current local timezone offset from UTC.
@type when: C{int}
@param when: POSIX (ie, UTC) timestamp for which to find the offset.
@rtype: C{int}
@return: The number of seconds offset from UTC. West is positive,
east is negative.
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Format the given UTC value as a string representing that time in the
local timezone.
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ISO8601 time separated by a space). It can be customized using the
C{timeFormat} attribute, which will be used as input for the underlying
L{datetime.datetime.strftime} call.
@type when: C{int}
@param when: POSIX (ie, UTC) timestamp for which to find the offset.
@rtype: C{str}
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timeFormatr r{ �strftimer~ rz �abs�intZyearZmonthZdayZhourZminute�second)r: r| ZtzOffsetZtzHourZtzMinZtzSignr r r �
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�zFileLogObserver.formatTimec C sh t |�}|dkrdS | �|d �}|d |�dd�d�}td|�}t�| j|d | � t�| j� dS ) z�
Format the given log event as text and write it to the output file.
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zFileLogObserver.emit) r r r r r� rJ r~ r� rs r r r r rv � s rv c @ s" e Zd ZdZddd�Zdd� ZdS ) �PythonLoggingObserveraL
Output twisted messages to Python standard library L{logging} module.
WARNING: specific logging configurations (example: network) can lead to
a blocking system. Nothing is done here to prevent that, so be sure to not
use this: code within Twisted, such as twisted.web, assumes that logging
does not block.
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@param loggerName: identifier used for getting logger.
@type loggerName: C{str}
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loggerNamer r r rJ A s z PythonLoggingObserver.__init__c C s d|krt | j|t� dS )a(
Receive a twisted log entry, format it and bridge it to python.
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level, and you can customize the level by using the C{logLevel} key::
>>> log.msg('debugging', logLevel=logging.DEBUG)
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log_formatN)r[ r� r\ )r: r r r r rs I s zPythonLoggingObserver.emitN)r� )r r r r rJ rs r r r r r� 7 s
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Class that pretends to be stdout/err, and turns writes into log messages.
@ivar isError: boolean indicating whether this is stderr, in which cases
log messages will be logged as errors.
@ivar encoding: unicode encoding used to encode any unicode strings
written to this object.
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Initialize logging to a specified file.
@return: A L{FileLogObserver} if a new observer is added, None otherwise.
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Initialize logging to a specified observer. If setStdout is true
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to the specified file.
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A file-like object that discards everything.
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Do nothing.
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Discard messages logged via the global C{logfile} object.
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Default observer.
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Will be removed when startLogging() is called for the first time.
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Emit an event dict.
@param eventDict: an event dict
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