grpc C# 应用

grpc共有四种模式：一般模式、输入流式、输出流式、双向流式

该demo采用一个普通grpc例子和一个输出流式例子

entity.proto

syntax = "proto3";
package Grpc.Contract;
message UserModel{
    int32 Id = 1;
    string Name = 2;
}
message SearchModel{
    int32 Id = 1;
    string Keywords = 2;
}
message ResultModel{
    bool Success = 1;
}

user.proto

syntax = "proto3";
import "entity.proto";
package Grpc.Contract;
service User {
    rpc User(SearchModel) returns (UserModel){}
}
service Users{
    rpc Users(SearchModel) returns (stream UserModel){}
}

执行tool命令生成c#类文件 protoc.exe -I=. --csharp_out=. --grpc_out=. --plugin=protoc-gen-grpc=grpc_csharp_plugin.exe GetUser.proto

服务端代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Grpc.Contract;
using Grpc.Core;

namespace Grpc.Server
{
    public class UserBll : User.UserBase
    {
        public override async Task<UserModel> User(SearchModel request, ServerCallContext context)
        {
            return await Task.FromResult(new UserModel { Id = 1, Name = "test1" });
        }
    }

    public class UsersBll : Users.UsersBase
    {
        public async override Task Users(SearchModel request, IServerStreamWriter<UserModel> responseStream, ServerCallContext context)
        {
            var users = new List<UserModel> { new UserModel { Id = 1, Name = "test1" }, new UserModel { Id = 2, Name = "test2" }, new UserModel { Id = 3, Name = "test3" } };
            foreach (var user in users)
            {
                await responseStream.WriteAsync(user);
            }
        }

    }
}

启动服务端

using Grpc.Contract;
using Grpc.Core;
using Grpc.Server;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            const int port = 9725;
            Server server = new Server
            {
                Services = {
                    User.BindService(new UserBll()),
                    Users.BindService(new UsersBll())
                },
                Ports = { new ServerPort("127.0.0.1", port, ServerCredentials.Insecure) }
            };
            server.Start();
            Console.WriteLine("grpc server started at port " + port);
            Console.ReadLine();
        }
    }
}

客户端依然需要契约，由于此demo都是C#语言，所以契约使用同一个就行，否则按照对应语言生成契约

客户端代码

using Grpc.Contract;
using Grpc.Core;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace GrpcConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            var channel = new Channel("127.0.0.1:9725", ChannelCredentials.Insecure);
            var req = new User.UserClient(channel);
            var rsp = req.User(new SearchModel { Id = 1 });

            var users = new List<UserModel>();
            var usersSearch = new Users.UsersClient(channel);
            using (var usersResponse = usersSearch.Users(new SearchModel { Id = 1 }))
            {
                while (usersResponse.ResponseStream.MoveNext().Result)
                {
                    users.Add(usersResponse.ResponseStream.Current);
                }
            }

            channel.ShutdownAsync().Wait();
            Console.WriteLine(JsonConvert.SerializeObject(rsp));
            Console.WriteLine(JsonConvert.SerializeObject(users));
        }
    }
}

参考宋米粒的博文，写的很详细 https://www.cnblogs.com/songjl/p/NETGRPC.html

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