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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.beta._connectivity_channel."""
import threading
import time
import unittest
from grpc._adapter import _low
from grpc._adapter import _types
from grpc.beta import _connectivity_channel
from grpc.beta import interfaces
from tests.unit.framework.common import test_constants
def _drive_completion_queue(completion_queue):
while True:
event = completion_queue.next(time.time() + 24 * 60 * 60)
if event.type == _types.EventType.QUEUE_SHUTDOWN:
break
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):
low_channel = _low.Channel('localhost:12345', ())
callback = _Callback()
connectivity_channel = _connectivity_channel.ConnectivityChannel(
low_channel)
connectivity_channel.subscribe(callback.update, try_to_connect=False)
first_connectivities = callback.block_until_connectivities_satisfy(bool)
connectivity_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()
connectivity_channel.unsubscribe(callback.update)
fourth_connectivities = callback.connectivities()
connectivity_channel.unsubscribe(callback.update)
fifth_connectivities = callback.connectivities()
self.assertSequenceEqual(
(interfaces.ChannelConnectivity.IDLE,), first_connectivities)
self.assertNotIn(
interfaces.ChannelConnectivity.READY, second_connectivities)
self.assertNotIn(
interfaces.ChannelConnectivity.READY, third_connectivities)
self.assertNotIn(
interfaces.ChannelConnectivity.READY, fourth_connectivities)
self.assertNotIn(
interfaces.ChannelConnectivity.READY, fifth_connectivities)
def test_immediately_connectable_channel_connectivity(self):
server_completion_queue = _low.CompletionQueue()
server = _low.Server(server_completion_queue, [])
port = server.add_http2_port('[::]:0')
server.start()
server_completion_queue_thread = threading.Thread(
target=_drive_completion_queue, args=(server_completion_queue,))
server_completion_queue_thread.start()
low_channel = _low.Channel('localhost:%d' % port, ())
first_callback = _Callback()
second_callback = _Callback()
connectivity_channel = _connectivity_channel.ConnectivityChannel(
low_channel)
connectivity_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()
connectivity_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(
lambda connectivities:
interfaces.ChannelConnectivity.READY in connectivities)
second_callback.block_until_connectivities_satisfy(
lambda connectivities:
interfaces.ChannelConnectivity.READY in connectivities)
connectivity_channel.unsubscribe(first_callback.update)
connectivity_channel.unsubscribe(second_callback.update)
server.shutdown()
server_completion_queue.shutdown()
server_completion_queue_thread.join()
self.assertSequenceEqual(
(interfaces.ChannelConnectivity.IDLE,), first_connectivities)
self.assertSequenceEqual(
(interfaces.ChannelConnectivity.IDLE,), second_connectivities)
self.assertNotIn(
interfaces.ChannelConnectivity.TRANSIENT_FAILURE, third_connectivities)
self.assertNotIn(
interfaces.ChannelConnectivity.FATAL_FAILURE, third_connectivities)
self.assertNotIn(
interfaces.ChannelConnectivity.TRANSIENT_FAILURE,
fourth_connectivities)
self.assertNotIn(
interfaces.ChannelConnectivity.FATAL_FAILURE, fourth_connectivities)
def test_reachable_then_unreachable_channel_connectivity(self):
server_completion_queue = _low.CompletionQueue()
server = _low.Server(server_completion_queue, [])
port = server.add_http2_port('[::]:0')
server.start()
server_completion_queue_thread = threading.Thread(
target=_drive_completion_queue, args=(server_completion_queue,))
server_completion_queue_thread.start()
low_channel = _low.Channel('localhost:%d' % port, ())
callback = _Callback()
connectivity_channel = _connectivity_channel.ConnectivityChannel(
low_channel)
connectivity_channel.subscribe(callback.update, try_to_connect=True)
callback.block_until_connectivities_satisfy(
lambda connectivities:
interfaces.ChannelConnectivity.READY in connectivities)
# Now take down the server and confirm that channel readiness is repudiated.
server.shutdown()
callback.block_until_connectivities_satisfy(
lambda connectivities:
connectivities[-1] is not interfaces.ChannelConnectivity.READY)
connectivity_channel.unsubscribe(callback.update)
server.shutdown()
server_completion_queue.shutdown()
server_completion_queue_thread.join()
if __name__ == '__main__':
unittest.main(verbosity=2)
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