如何设置 DotNetty(Netty) Bootstrap.ConnectAsync 超时？

Question

我在 Unity 中使用 DotNetty，并有以下客户端 bootstrap，当服务器关闭时，它会在“clientBootstrap.ConnectAsync()”大约 17 秒后放弃尝试建立连接，在此期间，客户端被冻结。其实用不着试17秒就知道连接不上了。我如何配置才能使“clientBootstrap.ConnectAsync()”仅尝试 5 秒？我添加了“.Option(ChannelOption.ConnectTimeout, TimeSpan.FromMilliseconds(5000))”，但仍然需要 17 秒才能停止尝试。该选项仅触发了额外的超时异常。

    try
    {
        var clientBootstrap = new Bootstrap();
        clientBootstrap
            .Group(group)
            .Channel<TcpSocketChannel>()
            .Option(ChannelOption.TcpNodelay, true)
            .Option(ChannelOption.ConnectTimeout, TimeSpan.FromMilliseconds(1000))
            .Handler(new ActionChannelInitializer<ISocketChannel>(channel =>
            {
                var pipeline = channel.Pipeline;
                pipeline.AddLast(new IdleStateHandler(0, 0, 6));
                ......
            }));
        clientChannel = await clientBootstrap.ConnectAsync(new IPEndPoint(IPAddress.Parse(IP), Port));

非常感谢。

Answer 1

你应该可以根据this设置超时：

不熟悉 dotnetty 但应用于您的代码段我会尝试类似的方法：

try
{
    var clientBootstrap = new Bootstrap();
    clientBootstrap
        .Group(group)
        .Channel<TcpSocketChannel>()
        .Option(ChannelOption.TcpNodelay, true)
        .Option(ChannelOption.ConnectTimeout, TimeSpan.FromMilliseconds(1000))
        .Handler(new ActionChannelInitializer<ISocketChannel>(channel =>
        {
            var pipeline = channel.Pipeline;
            pipeline.AddLast(new IdleStateHandler(0, 0, 6));
            ......
        }));
    
    int timeout = 5000;
    var clientChannel = clientBootstrap.ConnectAsync(new IPEndPoint(IPAddress.Parse(IP), Port));
    if (await Task.WhenAny(clientChannel, Task.Delay(timeout)) == clientChannel) {
        // task completed within timeout
    } else { 
        // timeout logic
    }
}

有用读任务延迟documentation:

如何设置 DotNetty(Netty) Bootstrap.ConnectAsync 超时？

How to set DotNetty(Netty) Bootstrap.ConnectAsync timeout?

.net

tcp

unity3d

netty