metadata_server.py

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# Copyright 2018 The 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.
"""Example gRPC server that gets/sets metadata (HTTP2 headers)"""
 
from __future__ import print_function
 
from concurrent import futures
import logging
 
import grpc
import helloworld_pb2
import helloworld_pb2_grpc
 
 
class Greeter(helloworld_pb2_grpc.GreeterServicer):
 
    def SayHello(self, request, context):
        for key, value in context.invocation_metadata():
            print('Received initial metadata: key=%s value=%s' % (key, value))
 
        context.set_trailing_metadata((
            ('checksum-bin', b'I agree'),
            ('retry', 'false'),
        ))
        return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name)
 
 
def serve():
    server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
    helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
    server.add_insecure_port('[::]:50051')
    server.start()
    server.wait_for_termination()
 
 
if __name__ == '__main__':
    logging.basicConfig()
    serve()