體驗用yarp連線websocket

飯勺oO發表於2021-11-16

前段時間一看yarp的倉庫，wow，終於釋出1.0版本了。.net也升級到6版本了，之前一直只是用yarp做HTTP轉發，今天剛好試試websocket

話不多說，直接開搞

配置叢集

首先先配置叢集資訊，必填的有
名稱
均衡負責策略
叢集列表，叢集Destinations可以配置多個。

配置路由

重點來了，配置路由轉發，需要將HTTP請求升級到WebSocket連結。
這個配置就比正常的Transforms多一點點
除了要新增PathPattern匹配轉發規則以外
還需要配置RequestHeader，將請求Upgrade成Websocket
如下圖配置

來來開始測試

建個最簡單SignalR服務

建個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);
        }
    }
}

順便提一下.net6新建的web模板真簡潔，startup.cs檔案都不需要了
配置host，主要新增signalr和websocket支援

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();

建個簡單的Console Signalr Client

.net6裡面連console模板的main函式都不需要，牛皮。
直接就可以寫程式碼

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);