开发笔记:python的gRPC示例

// 文件名 hello.proto
syntax = "proto3";
package hello;
// The greeting service definition.
service Greeter {
// Sends a greeting
rpc SayHello (HelloRequest) returns (HelloReply) {}
}
// The request message containing the user‘s name.
message HelloRequest {
string name = 1;
}
// The response message containing the greetings
message HelloReply {
string message = 1;
}

python -m grpc_tools.protoc -I./ --python_out=. --grpc_python_out=. ./hello.proto

from concurrent import futures
import time
import grpc
import hello_pb2
import hello_pb2_grpc
_ONE_DAY_IN_SECONDS = 60 * 60 * 24
class Greeter(hello_pb2_grpc.GreeterServicer):
# 工作函数
def SayHello(self, request, context):
return hello_pb2.HelloReply(message=‘Hello, %s!‘ % request.name)
def serve():
# gRPC 服务器
server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
hello_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
server.add_insecure_port(‘[::]:50051‘)
server.start() # start() 不会阻塞，如果运行时你的代码没有其它的事情可做，你可能需要循环等待。
try:
while True:
time.sleep(_ONE_DAY_IN_SECONDS)
except KeyboardInterrupt:
server.stop(0)
if __name__ == ‘__main__‘:
serve()

from __future__ import print_function
import grpc
import hello_pb2
import hello_pb2_grpc
def run():
channel = grpc.insecure_channel(‘localhost:50051‘)
stub = hello_pb2_grpc.GreeterStub(channel)
response = stub.SayHello(hello_pb2.HelloRequest(name=‘goodspeed‘))
print("Greeter client received: " + response.message)
if __name__ == ‘__main__‘:
run()