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Current File : /proc/thread-self/root/lib/python3/dist-packages/twisted/logger/_format.py
# -*- test-case-name: twisted.logger.test.test_format -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Tools for formatting logging events.
"""

from datetime import datetime as DateTime

from twisted.python.compat import unicode
from twisted.python.failure import Failure
from twisted.python.reflect import safe_repr
from twisted.python._tzhelper import FixedOffsetTimeZone

from ._flatten import flatFormat, aFormatter

timeFormatRFC3339 = "%Y-%m-%dT%H:%M:%S%z"



def formatEvent(event):
    """
    Formats an event as a L{unicode}, using the format in
    C{event["log_format"]}.

    This implementation should never raise an exception; if the formatting
    cannot be done, the returned string will describe the event generically so
    that a useful message is emitted regardless.

    @param event: A logging event.
    @type event: L{dict}

    @return: A formatted string.
    @rtype: L{unicode}
    """
    return eventAsText(
        event,
        includeTraceback=False,
        includeTimestamp=False,
        includeSystem=False,
    )



def formatUnformattableEvent(event, error):
    """
    Formats an event as a L{unicode} that describes the event generically and a
    formatting error.

    @param event: A logging event.
    @type event: L{dict}

    @param error: The formatting error.
    @type error: L{Exception}

    @return: A formatted string.
    @rtype: L{unicode}
    """
    try:
        return (
            u"Unable to format event {event!r}: {error}"
            .format(event=event, error=error)
        )
    except BaseException:
        # Yikes, something really nasty happened.
        #
        # Try to recover as much formattable data as possible; hopefully at
        # least the namespace is sane, which will help you find the offending
        # logger.
        failure = Failure()

        text = u", ".join(
            u" = ".join((safe_repr(key), safe_repr(value)))
            for key, value in event.items()
        )

        return (
            u"MESSAGE LOST: unformattable object logged: {error}\n"
            u"Recoverable data: {text}\n"
            u"Exception during formatting:\n{failure}"
            .format(error=safe_repr(error), failure=failure, text=text)
        )



def formatTime(when, timeFormat=timeFormatRFC3339, default=u"-"):
    """
    Format a timestamp as text.

    Example::

        >>> from time import time
        >>> from twisted.logger import formatTime
        >>>
        >>> t = time()
        >>> formatTime(t)
        u'2013-10-22T14:19:11-0700'
        >>> formatTime(t, timeFormat="%Y/%W")  # Year and week number
        u'2013/42'
        >>>

    @param when: A timestamp.
    @type then: L{float}

    @param timeFormat: A time format.
    @type timeFormat: L{unicode} or L{None}

    @param default: Text to return if C{when} or C{timeFormat} is L{None}.
    @type default: L{unicode}

    @return: A formatted time.
    @rtype: L{unicode}
    """
    if (timeFormat is None or when is None):
        return default
    else:
        tz = FixedOffsetTimeZone.fromLocalTimeStamp(when)
        datetime = DateTime.fromtimestamp(when, tz)
        return unicode(datetime.strftime(timeFormat))



def formatEventAsClassicLogText(event, formatTime=formatTime):
    """
    Format an event as a line of human-readable text for, e.g. traditional log
    file output.

    The output format is C{u"{timeStamp} [{system}] {event}\\n"}, where:

        - C{timeStamp} is computed by calling the given C{formatTime} callable
          on the event's C{"log_time"} value

        - C{system} is the event's C{"log_system"} value, if set, otherwise,
          the C{"log_namespace"} and C{"log_level"}, joined by a C{u"#"}.  Each
          defaults to C{u"-"} is not set.

        - C{event} is the event, as formatted by L{formatEvent}.

    Example::

        >>> from __future__ import print_function
        >>> from time import time
        >>> from twisted.logger import formatEventAsClassicLogText
        >>> from twisted.logger import LogLevel
        >>>
        >>> formatEventAsClassicLogText(dict())  # No format, returns None
        >>> formatEventAsClassicLogText(dict(log_format=u"Hello!"))
        u'- [-#-] Hello!\\n'
        >>> formatEventAsClassicLogText(dict(
        ...     log_format=u"Hello!",
        ...     log_time=time(),
        ...     log_namespace="my_namespace",
        ...     log_level=LogLevel.info,
        ... ))
        u'2013-10-22T17:30:02-0700 [my_namespace#info] Hello!\\n'
        >>> formatEventAsClassicLogText(dict(
        ...     log_format=u"Hello!",
        ...     log_time=time(),
        ...     log_system="my_system",
        ... ))
        u'2013-11-11T17:22:06-0800 [my_system] Hello!\\n'
        >>>

    @param event: an event.
    @type event: L{dict}

    @param formatTime: A time formatter
    @type formatTime: L{callable} that takes an C{event} argument and returns
        a L{unicode}

    @return: A formatted event, or L{None} if no output is appropriate.
    @rtype: L{unicode} or L{None}
    """
    eventText = eventAsText(event, formatTime=formatTime)
    if not eventText:
        return None
    eventText = eventText.replace(u"\n", u"\n\t")
    return eventText + u"\n"



class CallMapping(object):
    """
    Read-only mapping that turns a C{()}-suffix in key names into an invocation
    of the key rather than a lookup of the key.

    Implementation support for L{formatWithCall}.
    """
    def __init__(self, submapping):
        """
        @param submapping: Another read-only mapping which will be used to look
            up items.
        """
        self._submapping = submapping


    def __getitem__(self, key):
        """
        Look up an item in the submapping for this L{CallMapping}, calling it
        if C{key} ends with C{"()"}.
        """
        callit = key.endswith(u"()")
        realKey = key[:-2] if callit else key
        value = self._submapping[realKey]
        if callit:
            value = value()
        return value



def formatWithCall(formatString, mapping):
    """
    Format a string like L{unicode.format}, but:

        - taking only a name mapping; no positional arguments

        - with the additional syntax that an empty set of parentheses
          correspond to a formatting item that should be called, and its result
          C{str}'d, rather than calling C{str} on the element directly as
          normal.

    For example::

        >>> formatWithCall("{string}, {function()}.",
        ...                dict(string="just a string",
        ...                     function=lambda: "a function"))
        'just a string, a function.'

    @param formatString: A PEP-3101 format string.
    @type formatString: L{unicode}

    @param mapping: A L{dict}-like object to format.

    @return: The string with formatted values interpolated.
    @rtype: L{unicode}
    """
    return unicode(
        aFormatter.vformat(formatString, (), CallMapping(mapping))
    )



def _formatEvent(event):
    """
    Formats an event as a L{unicode}, using the format in
    C{event["log_format"]}.

    This implementation should never raise an exception; if the formatting
    cannot be done, the returned string will describe the event generically so
    that a useful message is emitted regardless.

    @param event: A logging event.
    @type event: L{dict}

    @return: A formatted string.
    @rtype: L{unicode}
    """
    try:
        if "log_flattened" in event:
            return flatFormat(event)

        format = event.get("log_format", None)
        if format is None:
            return u""

        # Make sure format is unicode.
        if isinstance(format, bytes):
            # If we get bytes, assume it's UTF-8 bytes
            format = format.decode("utf-8")
        elif not isinstance(format, unicode):
            raise TypeError(
                "Log format must be unicode or bytes, not {0!r}".format(format)
            )

        return formatWithCall(format, event)

    except BaseException as e:
        return formatUnformattableEvent(event, e)



def _formatTraceback(failure):
    """
    Format a failure traceback, assuming UTF-8 and using a replacement
    strategy for errors.  Every effort is made to provide a usable
    traceback, but should not that not be possible, a message and the
    captured exception are logged.

    @param failure: The failure to retrieve a traceback from.
    @type failure: L{twisted.python.failure.Failure}

    @return: The formatted traceback.
    @rtype: L{unicode}
    """
    try:
        traceback = failure.getTraceback()
        if isinstance(traceback, bytes):
            traceback = traceback.decode('utf-8', errors='replace')
    except BaseException as e:
        traceback = (
            u"(UNABLE TO OBTAIN TRACEBACK FROM EVENT):" + unicode(e)
        )
    return traceback



def _formatSystem(event):
    """
    Format the system specified in the event in the "log_system" key if set,
    otherwise the C{"log_namespace"} and C{"log_level"}, joined by a C{u"#"}.
    Each defaults to C{u"-"} is not set.  If formatting fails completely,
    "UNFORMATTABLE" is returned.

    @param event: The event containing the system specification.
    @type event: L{dict}

    @return: A formatted string representing the "log_system" key.
    @rtype: L{unicode}
    """
    system = event.get("log_system", None)
    if system is None:
        level = event.get("log_level", None)
        if level is None:
            levelName = u"-"
        else:
            levelName = level.name

        system = u"{namespace}#{level}".format(
            namespace=event.get("log_namespace", u"-"),
            level=levelName,
        )
    else:
        try:
            system = unicode(system)
        except Exception:
            system = u"UNFORMATTABLE"
    return system



def eventAsText(
        event,
        includeTraceback=True,
        includeTimestamp=True,
        includeSystem=True,
        formatTime=formatTime,
):
    r"""
    Format an event as a unicode string.  Optionally, attach timestamp,
    traceback, and system information.

    The full output format is:
    C{u"{timeStamp} [{system}] {event}\n{traceback}\n"} where:

        - C{timeStamp} is the event's C{"log_time"} value formatted with
          the provided C{formatTime} callable.

        - C{system} is the event's C{"log_system"} value, if set, otherwise,
          the C{"log_namespace"} and C{"log_level"}, joined by a C{u"#"}.  Each
          defaults to C{u"-"} is not set.

        - C{event} is the event, as formatted by L{formatEvent}.

        - C{traceback} is the traceback if the event contains a
          C{"log_failure"} key.  In the event the original traceback cannot
          be formatted, a message indicating the failure will be substituted.

    If the event cannot be formatted, and no traceback exists, an empty string
    is returned, even if includeSystem or includeTimestamp are true.

    @param event: A logging event.
    @type event: L{dict}

    @param includeTraceback: If true and a C{"log_failure"} key exists, append
        a traceback.
    @type includeTraceback: L{bool}

    @param includeTimestamp: If true include a formatted timestamp before the
        event.
    @type includeTimestamp: L{bool}

    @param includeSystem:  If true, include the event's C{"log_system"} value.
    @type includeSystem: L{bool}

    @param formatTime: A time formatter
    @type formatTime: L{callable} that takes an C{event} argument and returns
        a L{unicode}

    @return: A formatted string with specified options.
    @rtype: L{unicode}

    @since: Twisted 18.9.0
    """
    eventText = _formatEvent(event)
    if includeTraceback and 'log_failure' in event:
        f = event['log_failure']
        traceback = _formatTraceback(f)
        eventText = u"\n".join((eventText, traceback))

    if not eventText:
        return eventText

    timeStamp = u""
    if includeTimestamp:
        timeStamp = u"".join([formatTime(event.get("log_time", None)), " "])

    system = u""
    if includeSystem:
        system = u"".join([
            u"[",
            _formatSystem(event),
            u"]",
            u" "
        ])

    return u"{timeStamp}{system}{eventText}".format(
        timeStamp=timeStamp,
        system=system,
        eventText=eventText,
    )

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