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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.
"""Tests of grpc.channel_ready_future."""
import threading
import unittest
import logging
import grpc
from tests.unit.framework.common import test_constants
from tests.unit import _thread_pool
class _Callback(object):
def __init__(self):
self._condition = threading.Condition()
self._value = None
def accept_value(self, value):
with self._condition:
self._value = value
self._condition.notify_all()
def block_until_called(self):
with self._condition:
while self._value is None:
self._condition.wait()
return self._value
class ChannelReadyFutureTest(unittest.TestCase):
def test_lonely_channel_connectivity(self):
channel = grpc.insecure_channel('localhost:12345')
callback = _Callback()
ready_future = grpc.channel_ready_future(channel)
ready_future.add_done_callback(callback.accept_value)
with self.assertRaises(grpc.FutureTimeoutError):
ready_future.result(timeout=test_constants.SHORT_TIMEOUT)
self.assertFalse(ready_future.cancelled())
self.assertFalse(ready_future.done())
self.assertTrue(ready_future.running())
ready_future.cancel()
value_passed_to_callback = callback.block_until_called()
self.assertIs(ready_future, value_passed_to_callback)
self.assertTrue(ready_future.cancelled())
self.assertTrue(ready_future.done())
self.assertFalse(ready_future.running())
def test_immediately_connectable_channel_connectivity(self):
thread_pool = _thread_pool.RecordingThreadPool(max_workers=None)
server = grpc.server(thread_pool, options=(('grpc.so_reuseport', 0),))
port = server.add_insecure_port('[::]:0')
server.start()
channel = grpc.insecure_channel('localhost:{}'.format(port))
callback = _Callback()
ready_future = grpc.channel_ready_future(channel)
ready_future.add_done_callback(callback.accept_value)
self.assertIsNone(
ready_future.result(timeout=test_constants.LONG_TIMEOUT))
value_passed_to_callback = callback.block_until_called()
self.assertIs(ready_future, value_passed_to_callback)
self.assertFalse(ready_future.cancelled())
self.assertTrue(ready_future.done())
self.assertFalse(ready_future.running())
# Cancellation after maturity has no effect.
ready_future.cancel()
self.assertFalse(ready_future.cancelled())
self.assertTrue(ready_future.done())
self.assertFalse(ready_future.running())
self.assertFalse(thread_pool.was_used())
if __name__ == '__main__':
logging.basicConfig()
unittest.main(verbosity=2)
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