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1# Copyright 2023 gRPC authors.
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#     http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15from concurrent import futures
16from typing import Tuple
17
18import grpc
19
20_REQUEST = b"\x00\x00\x00"
21_RESPONSE = b"\x00\x00\x00"
22
23_UNARY_UNARY = "/test/UnaryUnary"
24_UNARY_UNARY_FILTERED = "/test/UnaryUnaryFiltered"
25_UNARY_STREAM = "/test/UnaryStream"
26_STREAM_UNARY = "/test/StreamUnary"
27_STREAM_STREAM = "/test/StreamStream"
28STREAM_LENGTH = 5
29TRIGGER_RPC_METADATA = ("control", "trigger_rpc")
30TRIGGER_RPC_TO_NEW_SERVER_METADATA = ("to_new_server", "")
31
32
33def handle_unary_unary(request, servicer_context):
34    if TRIGGER_RPC_METADATA in servicer_context.invocation_metadata():
35        for k, v in servicer_context.invocation_metadata():
36            if "port" in k:
37                unary_unary_call(port=int(v))
38            if "to_new_server" in k:
39                second_server = grpc.server(
40                    futures.ThreadPoolExecutor(max_workers=10)
41                )
42                second_server.add_generic_rpc_handlers((_GenericHandler(),))
43                second_server_port = second_server.add_insecure_port("[::]:0")
44                second_server.start()
45                unary_unary_call(port=second_server_port)
46                second_server.stop(0)
47    return _RESPONSE
48
49
50def handle_unary_stream(request, servicer_context):
51    for _ in range(STREAM_LENGTH):
52        yield _RESPONSE
53
54
55def handle_stream_unary(request_iterator, servicer_context):
56    return _RESPONSE
57
58
59def handle_stream_stream(request_iterator, servicer_context):
60    for request in request_iterator:
61        yield _RESPONSE
62
63
64class _MethodHandler(grpc.RpcMethodHandler):
65    def __init__(self, request_streaming, response_streaming):
66        self.request_streaming = request_streaming
67        self.response_streaming = response_streaming
68        self.request_deserializer = None
69        self.response_serializer = None
70        self.unary_unary = None
71        self.unary_stream = None
72        self.stream_unary = None
73        self.stream_stream = None
74        if self.request_streaming and self.response_streaming:
75            self.stream_stream = handle_stream_stream
76        elif self.request_streaming:
77            self.stream_unary = handle_stream_unary
78        elif self.response_streaming:
79            self.unary_stream = handle_unary_stream
80        else:
81            self.unary_unary = handle_unary_unary
82
83
84class _GenericHandler(grpc.GenericRpcHandler):
85    def service(self, handler_call_details):
86        if handler_call_details.method == _UNARY_UNARY:
87            return _MethodHandler(False, False)
88        if handler_call_details.method == _UNARY_UNARY_FILTERED:
89            return _MethodHandler(False, False)
90        elif handler_call_details.method == _UNARY_STREAM:
91            return _MethodHandler(False, True)
92        elif handler_call_details.method == _STREAM_UNARY:
93            return _MethodHandler(True, False)
94        elif handler_call_details.method == _STREAM_STREAM:
95            return _MethodHandler(True, True)
96        else:
97            return None
98
99
100def start_server(interceptors=None) -> Tuple[grpc.Server, int]:
101    if interceptors:
102        server = grpc.server(
103            futures.ThreadPoolExecutor(max_workers=10),
104            interceptors=interceptors,
105        )
106    else:
107        server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
108    server.add_generic_rpc_handlers((_GenericHandler(),))
109    port = server.add_insecure_port("[::]:0")
110    server.start()
111    return server, port
112
113
114def unary_unary_call(port, metadata=None):
115    with grpc.insecure_channel(f"localhost:{port}") as channel:
116        multi_callable = channel.unary_unary(_UNARY_UNARY)
117        if metadata:
118            unused_response, call = multi_callable.with_call(
119                _REQUEST, metadata=metadata
120            )
121        else:
122            unused_response, call = multi_callable.with_call(_REQUEST)
123
124
125def intercepted_unary_unary_call(port, interceptors, metadata=None):
126    with grpc.insecure_channel(f"localhost:{port}") as channel:
127        intercept_channel = grpc.intercept_channel(channel, interceptors)
128        multi_callable = intercept_channel.unary_unary(_UNARY_UNARY)
129        if metadata:
130            unused_response, call = multi_callable.with_call(
131                _REQUEST, metadata=metadata
132            )
133        else:
134            unused_response, call = multi_callable.with_call(_REQUEST)
135
136
137def unary_unary_filtered_call(port, metadata=None):
138    with grpc.insecure_channel(f"localhost:{port}") as channel:
139        multi_callable = channel.unary_unary(_UNARY_UNARY_FILTERED)
140        if metadata:
141            unused_response, call = multi_callable.with_call(
142                _REQUEST, metadata=metadata
143            )
144        else:
145            unused_response, call = multi_callable.with_call(_REQUEST)
146
147
148def unary_stream_call(port):
149    with grpc.insecure_channel(f"localhost:{port}") as channel:
150        multi_callable = channel.unary_stream(_UNARY_STREAM)
151        call = multi_callable(_REQUEST)
152        for _ in call:
153            pass
154
155
156def stream_unary_call(port):
157    with grpc.insecure_channel(f"localhost:{port}") as channel:
158        multi_callable = channel.stream_unary(_STREAM_UNARY)
159        unused_response, call = multi_callable.with_call(
160            iter([_REQUEST] * STREAM_LENGTH)
161        )
162
163
164def stream_stream_call(port):
165    with grpc.insecure_channel(f"localhost:{port}") as channel:
166        multi_callable = channel.stream_stream(_STREAM_STREAM)
167        call = multi_callable(iter([_REQUEST] * STREAM_LENGTH))
168        for _ in call:
169            pass
170