体验用yarp连接websocket

前段时间一看yarp的仓库，wow，终于发布1.0版本了。.net也升级到6版本了，之前一直只是用yarp做HTTP转发，今天刚好试试websocket

话不多说，直接开搞

配置集群

首先先配置集群信息，必填的有
名称
均衡负责策略
集群列表，集群Destinations可以配置多个。

配置路由

重点来了，配置路由转发，需要将HTTP请求升级到WebSocket链接。
这个配置就比正常的Transforms多一点点
除了要添加PathPattern匹配转发规则以外
还需要配置RequestHeader，将请求Upgrade成Websocket
如下图配置

来来开始测试

建个最简单SignalR服务

建个TestHub

using Microsoft.AspNetCore.SignalR;

namespace TestSinganlR
{
    public class TestHub : Hub
    {
        public override Task OnConnectedAsync()
        {
            Console.WriteLine("````````````````````````````````");
            Console.WriteLine("``````````OnConnected```````````");
            Console.WriteLine("````````````````````````````````");
            return base.OnConnectedAsync();
        }

        public override Task OnDisconnectedAsync(Exception? exception)
        {
            Console.WriteLine("````````````````````````````````");
            Console.WriteLine("``````````OnDisconnected```````````");
            Console.WriteLine("````````````````````````````````");
            return base.OnDisconnectedAsync(exception);
        }
    }
}

顺便提一下.net6新建的web模板真简洁，startup.cs文件都不需要了
配置host，主要添加signalr和websocket支持

using Microsoft.AspNetCore.WebSockets;
using TestSinganlR;

var builder = WebApplication.CreateBuilder(args);

builder.WebHost.ConfigureServices(services => {
    services.AddSignalR();
    services.AddWebSockets(options => {
        });
}
);

// Add services to the container.
builder.Services.AddRazorPages();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
}
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();
app.UseWebSockets();
app.MapRazorPages();
app.MapHub<TestHub>("testhub");
app.Run();

建个简单的Console Signalr Client

.net6里面连console模板的main函数都不需要，牛皮。
直接就可以写代码

using Microsoft.AspNetCore.SignalR.Client;

var connection = new HubConnectionBuilder()
    .WithUrl("http://127.0.0.1:5000/hub/testhub", options => {
        options.Transports = Microsoft.AspNetCore.Http.Connections.HttpTransportType.WebSockets;
        options.SkipNegotiation = true;
        })
    .WithAutomaticReconnect()
    .Build();
await connection.StartAsync();

Thread.Sleep(int.MaxValue);