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# Copyright 2015 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import threading
from grpc._cython import cygrpc
class SimpleFuture(object):
"""A simple future mechanism."""
def __init__(self, function, *args, **kwargs):
def wrapped_function():
try:
self._result = function(*args, **kwargs)
except Exception as error: # pylint: disable=broad-except
self._error = error
self._result = None
self._error = None
self._thread = threading.Thread(target=wrapped_function)
self._thread.start()
def result(self):
"""The resulting value of this future.
Re-raises any exceptions.
"""
self._thread.join()
if self._error:
# TODO(atash): re-raise exceptions in a way that preserves tracebacks
raise self._error # pylint: disable=raising-bad-type
return self._result
class CompletionQueuePollFuture(SimpleFuture):
def __init__(self, completion_queue, deadline):
super(CompletionQueuePollFuture,
self).__init__(lambda: completion_queue.poll(deadline=deadline))
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