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contego / home / tvault / .virtenv / lib / python2.7 / site-packages / oslo_utils / excutils.pyc
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Exception related utilities.
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    handles chaining in a much more elegant manner.

    :param message: the exception message, typically some string that is
                    useful for consumers to view when debugging or analyzing
                    failures.
    :param cause: the cause of the exception being raised, when provided this
                  should itself be an exception instance, this is useful for
                  creating a chain of exceptions for versions of python where
                  this is not yet implemented/supported natively.

    .. versionadded:: 2.4
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    NOTE(harlowja): Since in py3.x exceptions can be chained (due to
    :pep:`3134`) we should try to raise the desired exception with the given
    *cause* (or extract a *cause* from the current stack if able) so that the
    exception formats nicely in old and new versions of python. Since py2.x
    does **not** support exception chaining (or formatting) the exception
    class provided should take a ``cause`` keyword argument (which it may
    discard if it wants) to its constructor which can then be
    inspected/retained on py2.x to get *similar* information as would be
    automatically included/obtainable in py3.x.

    :param exc_cls: the exception class to raise (typically one derived
                    from :py:class:`.CausedByException` or equivalent).
    :param message: the text/str message that will be passed to
                    the exceptions constructor as its first positional
                    argument.
    :param args: any additional positional arguments to pass to the
                 exceptions constructor.
    :param kwargs: any additional keyword arguments to pass to the
                   exceptions constructor.

    .. versionadded:: 1.6
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    being attempted to be re-raised after an exception handler is run. This
    can happen when eventlet switches greenthreads or when running an
    exception handler, code raises and catches an exception. In both
    cases the exception context will be cleared.

    To work around this, we save the exception state, run handler code, and
    then re-raise the original exception. If another exception occurs, the
    saved exception is logged and the new exception is re-raised.

    In some cases the caller may not want to re-raise the exception, and
    for those circumstances this context provides a reraise flag that
    can be used to suppress the exception.  For example::

      except Exception:
          with save_and_reraise_exception() as ctxt:
              decide_if_need_reraise()
              if not should_be_reraised:
                  ctxt.reraise = False

    If another exception occurs and reraise flag is False,
    the saved exception will not be logged.

    If the caller wants to raise new exception during exception handling
    he/she sets reraise to False initially with an ability to set it back to
    True if needed::

      except Exception:
          with save_and_reraise_exception(reraise=False) as ctxt:
              [if statements to determine whether to raise a new exception]
              # Not raising a new exception, so reraise
              ctxt.reraise = True

    .. versionchanged:: 1.4
       Added *logger* optional parameter.
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    The function retry delay is **always** one second unless
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    than 1.0 (less than zero values are automatically changed to be 0.0).

    If repeated exceptions with the same message occur, logging will only
    output/get triggered for those equivalent messages every 60.0
    seconds, this can be altered by keyword argument ``same_log_delay`` to
    be a value different than 60.0 seconds (exceptions that change the
    message are always logged no matter what this delay is set to). As in
    the ``retry_delay`` case if this is less than zero, it will be
    automatically changed to be 0.0.
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texception_filtercBs;eZdZd„Zd„Zd„Zd„Zd„ZRS(s|A context manager that prevents some exceptions from being raised.

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    exception should be ignored, in cases where complex logic beyond subclass
    matching is required. e.g.

    >>> @exception_filter
    >>> def ignore_test_assertions(ex):
    ...     return isinstance(ex, AssertionError) and 'test' in str(ex)

    The filter matching function can then be used as a context manager:

    >>> with ignore_test_assertions:
    ...     assert False, 'This is a test'

    or called directly:

    >>> try:
    ...     assert False, 'This is a test'
    ... except Exception as ex:
    ...     ignore_test_assertions(ex)

    Any non-matching exception will be re-raised. When the filter is used as a
    context manager, the traceback for re-raised exceptions is always
    preserved. When the filter is called as a function, the traceback is
    preserved provided that no other exceptions have been raised in the
    intervening time. The context manager method is preferred for this reason
    except in cases where the ignored exception affects control flow.
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        its original traceback.
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