grpc

document:

https://www.cnblogs.com/zongfa/p/12218341.html

 

my version:

Python 3.6.8

grpcio 1.25.0

grpcio-tools 1.25.0

nginx version: nginx/1.14.0

 

install:

pip3 install grpcio

pip3 install grpcio grpcio-tools googleapis-common-protos

pycharm:

protoc 准备工具

 

gen

create file  msg.proto

syntax = "proto3";  // 规定语法 proto3 
 
service MsgService {
 rpc GetMsg (MsgRequest) returns (MsgResponse){}
}  // service 规定服务的关键字 service单一请求单一回应的服务 
 
message MsgRequest {
  string name = 1;
}//定义括号里的初始值 type 可以是 int32，int64，double，float
 
message MsgResponse {
  string msg = 1;
}//定义括号里的初始值 

　　

comand gen my need server and client  of  python' code

 

 

python -m grpc_tools.protoc -I . --python_out=. --grpc_python_out=.msg.proto

and  from  msg.proto  

now you can look two files : msg_pb2.py and msg_pb2_grpc.py

 

msg_pb2.py  contain client  call server’code 

msg_pb2_grpc.py  usually contains the server's own code

 

 

use

and create a rpc  server for client call 

you need inherit class and rewrite function 

 use_server.py 

import grpc
import msg_pb2 #response 的一些方法 clinet
import msg_pb2_grpc #server
from concurrent import futures
import time
_ONE_DAY_IN_SECONDS = 60 * 60 * 24 #定义一天的秒数


class MsgServicer(msg_pb2_grpc.MsgServiceServicer):

   def GetMsg(self, request, context):
      print("Received name: %s" % request.name)
      return msg_pb2.MsgResponse(msg='Hello, %s!' % request.name)



def serve():
   server = grpc.server(futures.ThreadPoolExecutor(max_workers=1))
   msg_pb2_grpc.add_MsgServiceServicer_to_server(MsgServicer(), server) #定义的服务
   server.add_insecure_port('[::]:50051')
   server.start()
   #阻塞主进程 子进程不会退出
   try:
      while True:
         time.sleep(_ONE_DAY_IN_SECONDS)
   except KeyboardInterrupt:
      server.stop(0)


if __name__ == '__main__':
   serve()

start command 

python3  use_server.py 

 

now you can call rpc ,Wait and see

 

create a client call code !

 

use client call 

import grpc

import msg_pb2
import msg_pb2_grpc


def send_hello(name):
	# 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 = msg_pb2_grpc.MsgServiceStub(channel)
		response = stub.GetMsg(msg_pb2.MsgRequest(name=name))
	print("Client received: " + response.msg)


if __name__ == '__main__':
	send_hello("haha")