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1# Copyright 2019 The 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"""The Python example of utilizing Channelz feature."""
15
16from __future__ import absolute_import
17from __future__ import division
18from __future__ import print_function
19
20import argparse
21import logging
22from concurrent import futures
23import random
24
25import grpc
26from grpc_channelz.v1 import channelz
27
28from examples import helloworld_pb2
29from examples import helloworld_pb2_grpc
30
31_LOGGER = logging.getLogger(__name__)
32_LOGGER.setLevel(logging.INFO)
33
34_RANDOM_FAILURE_RATE = 0.3
35
36
37class FaultInjectGreeter(helloworld_pb2_grpc.GreeterServicer):
38
39    def __init__(self, failure_rate):
40        self._failure_rate = failure_rate
41
42    def SayHello(self, request, context):
43        if random.random() < self._failure_rate:
44            context.abort(grpc.StatusCode.UNAVAILABLE,
45                          'Randomly injected failure.')
46        return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name)
47
48
49def create_server(addr, failure_rate):
50    server = grpc.server(futures.ThreadPoolExecutor())
51    helloworld_pb2_grpc.add_GreeterServicer_to_server(
52        FaultInjectGreeter(failure_rate), server)
53
54    # Add Channelz Servicer to the gRPC server
55    channelz.add_channelz_servicer(server)
56
57    server.add_insecure_port(addr)
58    return server
59
60
61def main():
62    parser = argparse.ArgumentParser()
63    parser.add_argument('--addr',
64                        nargs=1,
65                        type=str,
66                        default='[::]:50051',
67                        help='the address to listen on')
68    parser.add_argument(
69        '--failure_rate',
70        nargs=1,
71        type=float,
72        default=0.3,
73        help='a float indicates the percentage of failed message injections')
74    args = parser.parse_args()
75
76    server = create_server(addr=args.addr, failure_rate=args.failure_rate)
77    server.start()
78    server.wait_for_termination()
79
80
81if __name__ == '__main__':
82    logging.basicConfig(level=logging.INFO)
83    main()
84