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# Copyright 2015, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Tests of grpc.channel_ready_future."""
import threading
import unittest
from concurrent import futures
import grpc
from grpc import _channel
from grpc import _server
from tests.unit.framework.common import test_constants
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(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):
server = _server.Server((), futures.ThreadPoolExecutor(max_workers=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(test_constants.SHORT_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())
if __name__ == '__main__':
unittest.main(verbosity=2)
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