[网络协议]SuperSocket在.Net5中使用——WebSocket Server篇

背景：SuperSocket支持WebSocket应用层协议，记录一下怎样使用

一.首先引用相关Nuget包

二、创建WebSocketHostBuilder

var host = WebSocketHostBuilder.Create().UseWebSocketMessageHandler(
                async (session, message) =>
                {
                    await session.SendAsync(message.Message);
                }
            )
            .ConfigureLogging((hostCtx, loggingBuilder) =>
            {
                loggingBuilder.AddConsole();
            })
            .Build();
            await host.RunAsync();

Server相关配置在appsettings.json中的serverOptions

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*",
  "serverOptions": {
    "name": "TestServer",
    "listeners": [
      {
        "ip": "Any",
        "port": "2020"
      },
      {
        "ip": "Any",
        "port": "2021"
      }
    ]
  }
}

这样就搭建好了

三、使用Command

?编写你的Command方法（和普通Socket有一点不一样，是WebSocketSession不是IAppSession）：

    public class Del : IAsyncCommand<WebSocketSession, MyPackage>
    {
        public async ValueTask ExecuteAsync(WebSocketSession session, MyPackage package)
        {
            //TODO 你的业务
            string sql = $" delete Users where UserName='{package.UserName}')";
            Thread.Sleep(2000);
            await session.SendAsync(Encoding.UTF8.GetBytes(package.UserName));
        }
    }

?在builder中注册Command：

      .UseCommand<MyPackage, StringPackageConverter>(commandOptions =>
                {
                    // register commands one by one
                    commandOptions.AddCommand<Del>();
                })

编写WebSocketPackage和你的Pakcge的转换方法：

 public class StringPackageConverter : IPackageMapper<WebSocketPackage, MyPackage>
    {
        public MyPackage Map(WebSocketPackage package)
        {
            var pack = new MyPackage();
            var arr = package.Message.Split(' ', 3, StringSplitOptions.RemoveEmptyEntries);
            pack.Key = arr[0];
            pack.UserName = arr[1];
            return pack;
        }
    }

这样就使用了Command

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