用Python编写简单的gRPC服务的详细过程

#apt install python3-pip
pip install grpcio
pip install protobuf
pip install grpcio_tools

syntax = "proto3";

message HeartbeatRequest{
	string Host      = 1;
	int32  Mem       = 2;
	int32  Disk      = 3;
	int32  Cpu       = 4;
	int64  Timestamp = 5;
	int64  Seq       = 6;

}

message HeartbeatResponse{
	int32  ErrCode   = 1;
	string ErrMsg    = 2;
}

syntax = "proto3";

import "heartbeat.proto";

// HeartBeatService
service HeartBeatService{
    rpc HeartBeat(HeartbeatRequest) returns(HeartbeatResponse){}
}

pip install grpcio
install grpcio-tools
#pip  install --upgrade protobuf

python -m grpc_tools.protoc -I=. --python_out=.. heartbeat.proto
python -m grpc_tools.protoc -I=. --grpc_python_out=.. heartbeat_service.proto

#!/usr/bin/env python
# coding=utf-8
import sys
from concurrent import futures
import time

import grpc
from google.protobuf.json_format import MessageToJson

import heartbeat_service_pb2_grpc
import heartbeat_pb2
from lib.core.log import LOGGER


class HeartBeatSrv(heartbeat_service_pb2_grpc.HeartBeatServiceServicer):
    def HeartBeat(self, msg, context):
        try:
            # LOGGER.info(MessageToJson(msg, preserving_proto_field_name=True))
            body = MessageToJson(msg, preserving_proto_field_name=True)
            LOGGER.info("Get Heartbeat Request: %s", body)

            response = heartbeat_pb2.HeartbeatResponse()
            response.ErrCode = 0000
            response.ErrMsg = "success"

            return response
        except Exception as e:
            print("exception in heartbeat")
            LOGGER.error("RPC Service exception: %s", e)
            response = heartbeat_pb2.HeartbeatResponse()
            response.ErrCode = 500
            response.ErrMsg = "rpc error: %s" % e
            return response


def server(host, rpc_port):
    # 这里通过thread pool来并发处理server的任务
    # 定义服务器并设置最大连接数,concurrent.futures是一个并发库，类似于线程池的概念
    grpc_server = grpc.server(futures.ThreadPoolExecutor(max_workers=100))
    # 不使用SSL
    grpc_server.add_insecure_port('[::]' + ':' + str(rpc_port))
    # This method is only safe to call before the server is started.
    #  绑定处理器HeartBeatSrv（自己实现了处理函数）
    heartbeat_service_pb2_grpc.add_HeartBeatServiceServicer_to_server(HeartBeatSrv(), grpc_server)
    # 该方法只能调用一次, start() 不会阻塞
    # 启动服务器
    grpc_server.start()
    LOGGER.info("server start...")
    while 1:
        time.sleep(10)
    #grpc_server.wait_for_termination()


def main():
    try:
        LOGGER.info("begin start server")

        rpc_port = 8090
        host = "::"
        server(host, rpc_port)

    except Exception as e:
        LOGGER.error("server start error: %s", e)
        time.sleep(5)


if __name__ == '__main__':
    LOGGER.info(sys.path)
    main()

from time import sleep

import grpc

import heartbeat_pb2
import heartbeat_service_pb2_grpc
from lib.core.log import LOGGER


def run(seq):
    option = [('grpc.keepalive_timeout_ms', 10000)]
    #
    with grpc.insecure_channel(target='127.0.0.1:8090', options=option) as channel:
        # 客户端实例
        stub = heartbeat_service_pb2_grpc.HeartBeatServiceStub(channel)
        # stub调用服务端方法
        response = stub.HeartBeat(heartbeat_pb2.HeartbeatRequest(Host='hello grpc', Seq=seq), timeout=10)
        LOGGER.info("response ErrCode:%s", response.ErrCode)


if __name__ == '__main__':

    for i in range(1, 10000):
        LOGGER.info("i: %s", i)
        sleep(3)
        run(i)