grpc接口测试：
1、安装：
pip install grpcio
pip install grpcio-tools
2、准备grpc协议文件如：helloword.proto
内容如下：
//helloworld.proto
syntax = "proto3";

service Greeter {
 rpc SayHello(HelloRequest) returns (HelloReply) {}
}

message HelloRequest {
  string name=1;
}

message HelloReply {
  string message = 1;
}

3、在本地helloword.proto所在目录下cmd执行：
python -m grpc_tools.protoc --python_out=. --grpc_python_out=. -I. helloword.proto
在当前目录生成如下两个文件：
helloword_pdb2.py
helloword_pdb2_grpc.py

4、编辑客户端请求：
#coding=utf-8
import helloword_pb2
import helloword_pb2_grpc
import grpc


def run():

    #连接rpc服务器,insecure(不安全的)
    """
    'localhost:50051' 为假设的服务端起在本地的端口
    """
    channel = grpc.insecure_channel('localhost:50051')

    #调用rpc服务
    """
    GreeterStub就是生成的name_pdb2_grpc.py中的类class GreeterStub(object)，
    而Geeeter就是grpc协议文档helloword.proto中的service Greeter，然后拼接成GreeterStub
    
    stub.SayHello就是 helloword.proto中的rpc SayHello，
    helloword_pb2.HelloRequest就是 rpc SayHello(HelloRequest)中的请求"HelloRequest"，
    参数就是name='test'就是 string name=1 定义的参数名name，
    
    response.message获取响应的结果 就是请求体message HelloReply中定义的string message = 1参数名message
    """
    stub = helloword_pb2_grpc.GreeterStub(channel)
    #response = stub.SayHello(helloword_pb2.HelloRequest(name='test'))
    request_data=helloword_pb2.HelloRequest(name='test')
    response = stub.SayHello(request_data)

    print('Greeter client received: '+response.message)

if __name__ == '__main__':
    run()

helloword_pb2.py

# -*- coding: utf-8 -*-
# Generated by the protocol buffer compiler.  DO NOT EDIT!
# source: helloword.proto
"""Generated protocol buffer code."""
from google.protobuf import descriptor as _descriptor
from google.protobuf import message as _message
from google.protobuf import reflection as _reflection
from google.protobuf import symbol_database as _symbol_database
# @@protoc_insertion_point(imports)

_sym_db = _symbol_database.Default()




DESCRIPTOR = _descriptor.FileDescriptor(
  name='helloword.proto',
  package='',
  syntax='proto3',
  serialized_options=None,
  create_key=_descriptor._internal_create_key,
  serialized_pb=b'\n\x0fhelloword.proto\"\x1c\n\x0cHelloRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\"\x1d\n\nHelloReply\x12\x0f\n\x07message\x18\x01 \x01(\t23\n\x07Greeter\x12(\n\x08SayHello\x12\r.HelloRequest\x1a\x0b.HelloReply\"\x00\x62\x06proto3'
)




_HELLOREQUEST = _descriptor.Descriptor(
  name='HelloRequest',
  full_name='HelloRequest',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  create_key=_descriptor._internal_create_key,
  fields=[
    _descriptor.FieldDescriptor(
      name='name', full_name='HelloRequest.name', index=0,
      number=1, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=b"".decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
  ],
  serialized_options=None,
  is_extendable=False,
  syntax='proto3',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=19,
  serialized_end=47,
)


_HELLOREPLY = _descriptor.Descriptor(
  name='HelloReply',
  full_name='HelloReply',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  create_key=_descriptor._internal_create_key,
  fields=[
    _descriptor.FieldDescriptor(
      name='message', full_name='HelloReply.message', index=0,
      number=1, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=b"".decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
  ],
  serialized_options=None,
  is_extendable=False,
  syntax='proto3',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=49,
  serialized_end=78,
)

DESCRIPTOR.message_types_by_name['HelloRequest'] = _HELLOREQUEST
DESCRIPTOR.message_types_by_name['HelloReply'] = _HELLOREPLY
_sym_db.RegisterFileDescriptor(DESCRIPTOR)

HelloRequest = _reflection.GeneratedProtocolMessageType('HelloRequest', (_message.Message,), {
  'DESCRIPTOR' : _HELLOREQUEST,
  '__module__' : 'helloword_pb2'
  # @@protoc_insertion_point(class_scope:HelloRequest)
  })
_sym_db.RegisterMessage(HelloRequest)

HelloReply = _reflection.GeneratedProtocolMessageType('HelloReply', (_message.Message,), {
  'DESCRIPTOR' : _HELLOREPLY,
  '__module__' : 'helloword_pb2'
  # @@protoc_insertion_point(class_scope:HelloReply)
  })
_sym_db.RegisterMessage(HelloReply)



_GREETER = _descriptor.ServiceDescriptor(
  name='Greeter',
  full_name='Greeter',
  file=DESCRIPTOR,
  index=0,
  serialized_options=None,
  create_key=_descriptor._internal_create_key,
  serialized_start=80,
  serialized_end=131,
  methods=[
  _descriptor.MethodDescriptor(
    name='SayHello',
    full_name='Greeter.SayHello',
    index=0,
    containing_service=None,
    input_type=_HELLOREQUEST,
    output_type=_HELLOREPLY,
    serialized_options=None,
    create_key=_descriptor._internal_create_key,
  ),
])
_sym_db.RegisterServiceDescriptor(_GREETER)

DESCRIPTOR.services_by_name['Greeter'] = _GREETER

# @@protoc_insertion_point(module_scope)

helloword_pb2_grpc.py

# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!
"""Client and server classes corresponding to protobuf-defined services."""
import grpc

import helloword_pb2 as helloword__pb2


class GreeterStub(object):
    """Missing associated documentation comment in .proto file."""

    def __init__(self, channel):
        """Constructor.

        Args:
            channel: A grpc.Channel.
        """
        self.SayHello = channel.unary_unary(
                '/Greeter/SayHello',
                request_serializer=helloword__pb2.HelloRequest.SerializeToString,
                response_deserializer=helloword__pb2.HelloReply.FromString,
                )


class GreeterServicer(object):
    """Missing associated documentation comment in .proto file."""

    def SayHello(self, request, context):
        """Missing associated documentation comment in .proto file."""
        context.set_code(grpc.StatusCode.UNIMPLEMENTED)
        context.set_details('Method not implemented!')
        raise NotImplementedError('Method not implemented!')


def add_GreeterServicer_to_server(servicer, server):
    rpc_method_handlers = {
            'SayHello': grpc.unary_unary_rpc_method_handler(
                    servicer.SayHello,
                    request_deserializer=helloword__pb2.HelloRequest.FromString,
                    response_serializer=helloword__pb2.HelloReply.SerializeToString,
            ),
    }
    generic_handler = grpc.method_handlers_generic_handler(
            'Greeter', rpc_method_handlers)
    server.add_generic_rpc_handlers((generic_handler,))


 # This class is part of an EXPERIMENTAL API.
class Greeter(object):
    """Missing associated documentation comment in .proto file."""

    @staticmethod
    def SayHello(request,
            target,
            options=(),
            channel_credentials=None,
            call_credentials=None,
            insecure=False,
            compression=None,
            wait_for_ready=None,
            timeout=None,
            metadata=None):
        return grpc.experimental.unary_unary(request, target, '/Greeter/SayHello',
            helloword__pb2.HelloRequest.SerializeToString,
            helloword__pb2.HelloReply.FromString,
            options, channel_credentials,
            insecure, call_credentials, compression, wait_for_ready, timeout, metadata)