blob: 8e91161f803f2efce5a1cc65b2557e6686de2f71 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
# 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:
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
return self._result
class CompletionQueuePollFuture(SimpleFuture):
def __init__(self, completion_queue, deadline):
super(CompletionQueuePollFuture,
self).__init__(lambda: completion_queue.poll(deadline))
|
