| # 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.Channel connectivity.""" |
| |
| import threading |
| import time |
| import unittest |
| from concurrent import futures |
| |
| import grpc |
| from grpc import _channel |
| from grpc import _server |
| from tests.unit.framework.common import test_constants |
| |
| |
| def _ready_in_connectivities(connectivities): |
| return grpc.ChannelConnectivity.READY in connectivities |
| |
| |
| def _last_connectivity_is_not_ready(connectivities): |
| return connectivities[-1] is not grpc.ChannelConnectivity.READY |
| |
| |
| class _Callback(object): |
| |
| def __init__(self): |
| self._condition = threading.Condition() |
| self._connectivities = [] |
| |
| def update(self, connectivity): |
| with self._condition: |
| self._connectivities.append(connectivity) |
| self._condition.notify() |
| |
| def connectivities(self): |
| with self._condition: |
| return tuple(self._connectivities) |
| |
| def block_until_connectivities_satisfy(self, predicate): |
| with self._condition: |
| while True: |
| connectivities = tuple(self._connectivities) |
| if predicate(connectivities): |
| return connectivities |
| else: |
| self._condition.wait() |
| |
| |
| class ChannelConnectivityTest(unittest.TestCase): |
| |
| def test_lonely_channel_connectivity(self): |
| callback = _Callback() |
| |
| channel = _channel.Channel('localhost:12345', None, None) |
| channel.subscribe(callback.update, try_to_connect=False) |
| first_connectivities = callback.block_until_connectivities_satisfy(bool) |
| channel.subscribe(callback.update, try_to_connect=True) |
| second_connectivities = callback.block_until_connectivities_satisfy( |
| lambda connectivities: 2 <= len(connectivities)) |
| # Wait for a connection that will never happen. |
| time.sleep(test_constants.SHORT_TIMEOUT) |
| third_connectivities = callback.connectivities() |
| channel.unsubscribe(callback.update) |
| fourth_connectivities = callback.connectivities() |
| channel.unsubscribe(callback.update) |
| fifth_connectivities = callback.connectivities() |
| |
| self.assertSequenceEqual( |
| (grpc.ChannelConnectivity.IDLE,), first_connectivities) |
| self.assertNotIn( |
| grpc.ChannelConnectivity.READY, second_connectivities) |
| self.assertNotIn( |
| grpc.ChannelConnectivity.READY, third_connectivities) |
| self.assertNotIn( |
| grpc.ChannelConnectivity.READY, fourth_connectivities) |
| self.assertNotIn( |
| grpc.ChannelConnectivity.READY, fifth_connectivities) |
| |
| def test_immediately_connectable_channel_connectivity(self): |
| server = _server.Server((), futures.ThreadPoolExecutor(max_workers=0)) |
| port = server.add_insecure_port('[::]:0') |
| server.start() |
| first_callback = _Callback() |
| second_callback = _Callback() |
| |
| channel = _channel.Channel('localhost:{}'.format(port), None, None) |
| channel.subscribe(first_callback.update, try_to_connect=False) |
| first_connectivities = first_callback.block_until_connectivities_satisfy( |
| bool) |
| # Wait for a connection that will never happen because try_to_connect=True |
| # has not yet been passed. |
| time.sleep(test_constants.SHORT_TIMEOUT) |
| second_connectivities = first_callback.connectivities() |
| channel.subscribe(second_callback.update, try_to_connect=True) |
| third_connectivities = first_callback.block_until_connectivities_satisfy( |
| lambda connectivities: 2 <= len(connectivities)) |
| fourth_connectivities = second_callback.block_until_connectivities_satisfy( |
| bool) |
| # Wait for a connection that will happen (or may already have happened). |
| first_callback.block_until_connectivities_satisfy(_ready_in_connectivities) |
| second_callback.block_until_connectivities_satisfy(_ready_in_connectivities) |
| del channel |
| |
| self.assertSequenceEqual( |
| (grpc.ChannelConnectivity.IDLE,), first_connectivities) |
| self.assertSequenceEqual( |
| (grpc.ChannelConnectivity.IDLE,), second_connectivities) |
| self.assertNotIn( |
| grpc.ChannelConnectivity.TRANSIENT_FAILURE, third_connectivities) |
| self.assertNotIn( |
| grpc.ChannelConnectivity.SHUTDOWN, third_connectivities) |
| self.assertNotIn( |
| grpc.ChannelConnectivity.TRANSIENT_FAILURE, |
| fourth_connectivities) |
| self.assertNotIn( |
| grpc.ChannelConnectivity.SHUTDOWN, fourth_connectivities) |
| |
| def test_reachable_then_unreachable_channel_connectivity(self): |
| server = _server.Server((), futures.ThreadPoolExecutor(max_workers=0)) |
| port = server.add_insecure_port('[::]:0') |
| server.start() |
| callback = _Callback() |
| |
| channel = _channel.Channel('localhost:{}'.format(port), None, None) |
| channel.subscribe(callback.update, try_to_connect=True) |
| callback.block_until_connectivities_satisfy(_ready_in_connectivities) |
| # Now take down the server and confirm that channel readiness is repudiated. |
| server.stop(None) |
| callback.block_until_connectivities_satisfy(_last_connectivity_is_not_ready) |
| channel.unsubscribe(callback.update) |
| |
| |
| if __name__ == '__main__': |
| unittest.main(verbosity=2) |