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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 client that gets/sets metadata (HTTP2 headers)"""
from __future__ import print_function
import logging
import grpc
import helloworld_pb2
import helloworld_pb2_grpc
def run():
# NOTE(gRPC Python Team): .close() is possible on a channel and should be
# used in circumstances in which the with statement does not fit the needs
# of the code.
with grpc.insecure_channel('localhost:50051') as channel:
stub = helloworld_pb2_grpc.GreeterStub(channel)
response, call = stub.SayHello.with_call(
helloworld_pb2.HelloRequest(name='you'),
metadata=(
('initial-metadata-1', 'The value should be str'),
('binary-metadata-bin',
b'With -bin surffix, the value can be bytes'),
('accesstoken', 'gRPC Python is great'),
))
print("Greeter client received: " + response.message)
for key, value in call.trailing_metadata():
print('Greeter client received trailing metadata: key=%s value=%s' %
(key, value))
if __name__ == '__main__':
logging.basicConfig()
run()
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