syntax = "proto3";
package services;
message ProdRequest {
    int32 prod_id = 1; //传入id
}

message ProdResponse {
    int32 prod_stock = 1; //商品库存
}

service ProdService {
    rpc GetProdStock (ProdRequest) returns (ProdResponse); //ProdRequest这里作为参数传进来表示
}

package services

import (
    "context"
)

type ProdService struct {
}

func (this *ProdService) GetProdStock(ctx context.Context, request *ProdRequest) (*ProdResponse, error) {
    return &ProdResponse{ProdStock: 20}, nil
}

package main

import (
    "google.golang.org/grpc"
    "grpcpro/services"
    "net"
)

func main() {
    rpcServer := grpc.NewServer()
    services.RegisterProdServiceServer(rpcServer, new(services.ProdService)) //将实现的Server注册到rpcServer中区

    lis, _ := net.Listen("tcp", ":8081")
    rpcServer.Serve(lis)
}