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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.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)
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