/usr/lib/python2.7/dist-packages/txaio/interfaces.py is in python-txaio 1.0.0-3.
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#
# The MIT License (MIT)
#
# Copyright (c) Tavendo GmbH
#
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# of this software and associated documentation files (the "Software"), to deal
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# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# THE SOFTWARE.
#
###############################################################################
import abc
import six
@six.add_metaclass(abc.ABCMeta)
class IFailedFuture(object):
"""
This defines the interface for a common object encapsulating a
failure from either an asyncio task/coroutine or a Twisted
Deferred.
An instance implementing this interface is given to any
``errback`` callables you provde via :meth:`txaio.add_callbacks`
It is a subset of Twisted's Failure interface, because on Twisted
backends it actually *is* a Failure.
"""
@abc.abstractproperty
def type(self):
"""
The type of the exception. Same as the first item returned from
``sys.exc_info()``
"""
@abc.abstractproperty
def value(self):
"""
An actual Exception instance. Same as the second item returned from
``sys.exc_info()``
"""
@abc.abstractproperty
def tb(self):
"""
A traceback object from the exception. Same as the third item
returned from ``sys.exc_info()``
"""
@abc.abstractmethod
def printTraceback(self, file=None):
"""
Prints the exception and its traceback to the given ``file``. If
that is ``None`` (the default) then it is printed to
``sys.stderr``.
XXX this is camelCase because Twisted is; can we change somehow?
"""
@abc.abstractmethod
def getErrorMessage(self):
"""
Return a string describing the error.
XXX this is camelCase because Twisted is; can we change somehow?
"""
# XXX anything else make sense? Do we ape the *entire* Failure API?
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