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# Copyright 2016 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.
"""Test making many calls and immediately cancelling most of them."""
import threading
import unittest
from grpc._cython import cygrpc
from grpc.framework.foundation import logging_pool
from tests.unit.framework.common import test_constants
_EMPTY_FLAGS = 0
_EMPTY_METADATA = ()
_SERVER_SHUTDOWN_TAG = 'server_shutdown'
_REQUEST_CALL_TAG = 'request_call'
_RECEIVE_CLOSE_ON_SERVER_TAG = 'receive_close_on_server'
_RECEIVE_MESSAGE_TAG = 'receive_message'
_SERVER_COMPLETE_CALL_TAG = 'server_complete_call'
_SUCCESS_CALL_FRACTION = 1.0 / 8.0
class _State(object):
def __init__(self):
self.condition = threading.Condition()
self.handlers_released = False
self.parked_handlers = 0
self.handled_rpcs = 0
def _is_cancellation_event(event):
return (event.tag is _RECEIVE_CLOSE_ON_SERVER_TAG and
event.batch_operations[0].received_cancelled)
class _Handler(object):
def __init__(self, state, completion_queue, rpc_event):
self._state = state
self._lock = threading.Lock()
self._completion_queue = completion_queue
self._call = rpc_event.call
def __call__(self):
with self._state.condition:
self._state.parked_handlers += 1
if self._state.parked_handlers == test_constants.THREAD_CONCURRENCY:
self._state.condition.notify_all()
while not self._state.handlers_released:
self._state.condition.wait()
with self._lock:
self._call.start_server_batch(
(cygrpc.ReceiveCloseOnServerOperation(_EMPTY_FLAGS),),
_RECEIVE_CLOSE_ON_SERVER_TAG)
self._call.start_server_batch(
(cygrpc.ReceiveMessageOperation(_EMPTY_FLAGS),),
_RECEIVE_MESSAGE_TAG)
first_event = self._completion_queue.poll()
if _is_cancellation_event(first_event):
self._completion_queue.poll()
else:
with self._lock:
operations = (
cygrpc.SendInitialMetadataOperation(_EMPTY_METADATA,
_EMPTY_FLAGS),
cygrpc.SendMessageOperation(b'\x79\x57', _EMPTY_FLAGS),
cygrpc.SendStatusFromServerOperation(
_EMPTY_METADATA, cygrpc.StatusCode.ok, b'test details!',
_EMPTY_FLAGS),
)
self._call.start_server_batch(operations,
_SERVER_COMPLETE_CALL_TAG)
self._completion_queue.poll()
self._completion_queue.poll()
def _serve(state, server, server_completion_queue, thread_pool):
for _ in range(test_constants.RPC_CONCURRENCY):
call_completion_queue = cygrpc.CompletionQueue()
server.request_call(call_completion_queue, server_completion_queue,
_REQUEST_CALL_TAG)
rpc_event = server_completion_queue.poll()
thread_pool.submit(_Handler(state, call_completion_queue, rpc_event))
with state.condition:
state.handled_rpcs += 1
if test_constants.RPC_CONCURRENCY <= state.handled_rpcs:
state.condition.notify_all()
server_completion_queue.poll()
class _QueueDriver(object):
def __init__(self, condition, completion_queue, due):
self._condition = condition
self._completion_queue = completion_queue
self._due = due
self._events = []
self._returned = False
def start(self):
def in_thread():
while True:
event = self._completion_queue.poll()
with self._condition:
self._events.append(event)
self._due.remove(event.tag)
self._condition.notify_all()
if not self._due:
self._returned = True
return
thread = threading.Thread(target=in_thread)
thread.start()
def events(self, at_least):
with self._condition:
while len(self._events) < at_least:
self._condition.wait()
return tuple(self._events)
class CancelManyCallsTest(unittest.TestCase):
def testCancelManyCalls(self):
server_thread_pool = logging_pool.pool(
test_constants.THREAD_CONCURRENCY)
server_completion_queue = cygrpc.CompletionQueue()
server = cygrpc.Server([
(
b'grpc.so_reuseport',
0,
),
])
server.register_completion_queue(server_completion_queue)
port = server.add_http2_port(b'[::]:0')
server.start()
channel = cygrpc.Channel('localhost:{}'.format(port).encode(), None)
state = _State()
server_thread_args = (
state,
server,
server_completion_queue,
server_thread_pool,
)
server_thread = threading.Thread(target=_serve, args=server_thread_args)
server_thread.start()
client_condition = threading.Condition()
client_due = set()
client_completion_queue = cygrpc.CompletionQueue()
client_driver = _QueueDriver(client_condition, client_completion_queue,
client_due)
client_driver.start()
with client_condition:
client_calls = []
for index in range(test_constants.RPC_CONCURRENCY):
client_call = channel.create_call(None, _EMPTY_FLAGS,
client_completion_queue,
b'/twinkies', None, None)
operations = (
cygrpc.SendInitialMetadataOperation(_EMPTY_METADATA,
_EMPTY_FLAGS),
cygrpc.SendMessageOperation(b'\x45\x56', _EMPTY_FLAGS),
cygrpc.SendCloseFromClientOperation(_EMPTY_FLAGS),
cygrpc.ReceiveInitialMetadataOperation(_EMPTY_FLAGS),
cygrpc.ReceiveMessageOperation(_EMPTY_FLAGS),
cygrpc.ReceiveStatusOnClientOperation(_EMPTY_FLAGS),
)
tag = 'client_complete_call_{0:04d}_tag'.format(index)
client_call.start_client_batch(operations, tag)
client_due.add(tag)
client_calls.append(client_call)
with state.condition:
while True:
if state.parked_handlers < test_constants.THREAD_CONCURRENCY:
state.condition.wait()
elif state.handled_rpcs < test_constants.RPC_CONCURRENCY:
state.condition.wait()
else:
state.handlers_released = True
state.condition.notify_all()
break
client_driver.events(
test_constants.RPC_CONCURRENCY * _SUCCESS_CALL_FRACTION)
with client_condition:
for client_call in client_calls:
client_call.cancel()
with state.condition:
server.shutdown(server_completion_queue, _SERVER_SHUTDOWN_TAG)
if __name__ == '__main__':
unittest.main(verbosity=2)
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