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# Copyright 2023 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.
from concurrent import futures
from typing import Tuple
import grpc
_REQUEST = b"\x00\x00\x00"
_RESPONSE = b"\x00\x00\x00"
_UNARY_UNARY = "/test/UnaryUnary"
_UNARY_UNARY_FILTERED = "/test/UnaryUnaryFiltered"
_UNARY_STREAM = "/test/UnaryStream"
_STREAM_UNARY = "/test/StreamUnary"
_STREAM_STREAM = "/test/StreamStream"
STREAM_LENGTH = 5
TRIGGER_RPC_METADATA = ("control", "trigger_rpc")
TRIGGER_RPC_TO_NEW_SERVER_METADATA = ("to_new_server", "")
def handle_unary_unary(request, servicer_context):
if TRIGGER_RPC_METADATA in servicer_context.invocation_metadata():
for k, v in servicer_context.invocation_metadata():
if "port" in k:
unary_unary_call(port=int(v))
if "to_new_server" in k:
second_server = grpc.server(
futures.ThreadPoolExecutor(max_workers=10)
)
second_server.add_generic_rpc_handlers((_GenericHandler(),))
second_server_port = second_server.add_insecure_port("[::]:0")
second_server.start()
unary_unary_call(port=second_server_port)
second_server.stop(0)
return _RESPONSE
def handle_unary_stream(request, servicer_context):
for _ in range(STREAM_LENGTH):
yield _RESPONSE
def handle_stream_unary(request_iterator, servicer_context):
return _RESPONSE
def handle_stream_stream(request_iterator, servicer_context):
for request in request_iterator:
yield _RESPONSE
class _MethodHandler(grpc.RpcMethodHandler):
def __init__(self, request_streaming, response_streaming):
self.request_streaming = request_streaming
self.response_streaming = response_streaming
self.request_deserializer = None
self.response_serializer = None
self.unary_unary = None
self.unary_stream = None
self.stream_unary = None
self.stream_stream = None
if self.request_streaming and self.response_streaming:
self.stream_stream = handle_stream_stream
elif self.request_streaming:
self.stream_unary = handle_stream_unary
elif self.response_streaming:
self.unary_stream = handle_unary_stream
else:
self.unary_unary = handle_unary_unary
class _GenericHandler(grpc.GenericRpcHandler):
def service(self, handler_call_details):
if handler_call_details.method == _UNARY_UNARY:
return _MethodHandler(False, False)
if handler_call_details.method == _UNARY_UNARY_FILTERED:
return _MethodHandler(False, False)
elif handler_call_details.method == _UNARY_STREAM:
return _MethodHandler(False, True)
elif handler_call_details.method == _STREAM_UNARY:
return _MethodHandler(True, False)
elif handler_call_details.method == _STREAM_STREAM:
return _MethodHandler(True, True)
else:
return None
def start_server(interceptors=None) -> Tuple[grpc.Server, int]:
if interceptors:
server = grpc.server(
futures.ThreadPoolExecutor(max_workers=10),
interceptors=interceptors,
)
else:
server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
server.add_generic_rpc_handlers((_GenericHandler(),))
port = server.add_insecure_port("[::]:0")
server.start()
return server, port
def unary_unary_call(port, metadata=None):
with grpc.insecure_channel(f"localhost:{port}") as channel:
multi_callable = channel.unary_unary(_UNARY_UNARY)
if metadata:
unused_response, call = multi_callable.with_call(
_REQUEST, metadata=metadata
)
else:
unused_response, call = multi_callable.with_call(_REQUEST)
def intercepted_unary_unary_call(port, interceptors, metadata=None):
with grpc.insecure_channel(f"localhost:{port}") as channel:
intercept_channel = grpc.intercept_channel(channel, interceptors)
multi_callable = intercept_channel.unary_unary(_UNARY_UNARY)
if metadata:
unused_response, call = multi_callable.with_call(
_REQUEST, metadata=metadata
)
else:
unused_response, call = multi_callable.with_call(_REQUEST)
def unary_unary_filtered_call(port, metadata=None):
with grpc.insecure_channel(f"localhost:{port}") as channel:
multi_callable = channel.unary_unary(_UNARY_UNARY_FILTERED)
if metadata:
unused_response, call = multi_callable.with_call(
_REQUEST, metadata=metadata
)
else:
unused_response, call = multi_callable.with_call(_REQUEST)
def unary_stream_call(port):
with grpc.insecure_channel(f"localhost:{port}") as channel:
multi_callable = channel.unary_stream(_UNARY_STREAM)
call = multi_callable(_REQUEST)
for _ in call:
pass
def stream_unary_call(port):
with grpc.insecure_channel(f"localhost:{port}") as channel:
multi_callable = channel.stream_unary(_STREAM_UNARY)
unused_response, call = multi_callable.with_call(
iter([_REQUEST] * STREAM_LENGTH)
)
def stream_stream_call(port):
with grpc.insecure_channel(f"localhost:{port}") as channel:
multi_callable = channel.stream_stream(_STREAM_STREAM)
call = multi_callable(iter([_REQUEST] * STREAM_LENGTH))
for _ in call:
pass
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