Question

我的websocket客户端需要通过包含base64编码图像的大型消息发送。现在，这暂时放慢了速度，我想......也许我应该在ASP.NET Core 2.0中增加我的websocket服务器的ReceiveBufferSize。

不幸的是......它似乎完全忽略了我的设置缓冲区大小......

阅读文档，这是设置ReceiveBufferSize的唯一方法，我发现：

WebSocketOptions webSocketOptions = new WebSocketOptions()
{
    ReceiveBufferSize = 8192
};
app.UseWebSockets(webSocketOptions);

连接开始使用ApiController将HttpContext传递给＆＃39; Service＆＃39;包含此方法：

public async Task Register(string hub, HttpContext httpContext)
{
    if (httpContext.WebSockets.IsWebSocketRequest)
    {
        WebSocket webSocket = await httpContext.WebSockets.AcceptWebSocketAsync();

        await _websocketServer.StartJoinHubWithId(webSocket, "hub", hub);
    }
}

然后将其传递给WebsocketHandler类，该类驻留在一个单独的书面库中，包含此方法为一些眼睛漂白做好准备：

private async Task ReadHandler(WebSocket socket, string hub, string clientId)
{
    byte[] buffer = new byte[8192];
    try
    {
        int mode = 0;
        string partialReceived = "";
        while (socket.State == WebSocketState.Open)
        {
            _isrunning = true;
            WebSocketReceiveResult result = await socket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);

            if (result.MessageType == WebSocketMessageType.Close)
            {
                _isrunning = false;
                await socket.CloseAsync(WebSocketCloseStatus.NormalClosure, string.Empty, CancellationToken.None);
            }
            else
            {

                if (result.EndOfMessage)
                {
                    if (result.MessageType == 0)
                    {
                        string message = Encoding.UTF8.GetString(buffer, 0, result.Count);

                        if (message.Length > 0)
                        {

                            if (message.Contains("PARTIAL-DATA,START"))
                            {
                                mode = 1;
                            }
                            else if (message.Contains("PARTIAL-DATA,END"))
                            {
                                OnWebsocketMessageReceived(partialReceived, hub, clientId);
                                partialReceived = "";
                                mode = 0;
                            }

                            switch (mode)
                            {
                                case 0:
                                    if (!message.Contains("PARTIAL-DATA"))
                                    {
                                        OnWebsocketMessageReceived(message, hub, clientId);
                                    }
                                    break;
                                case 1:
                                    if (message.Contains("PARTIAL-DATA,"))
                                    {
                                        if (!message.Contains("PARTIAL-DATA,START") &&
                                            !message.Contains("PARTIAL-DATA,END"))
                                        {
                                            partialReceived = partialReceived + message.Substring(13);
                                        }
                                    }
                                    else
                                    {
                                        Debug.WriteLine(
                                            "ERROR, PARTIAL DATA DID NOT START WITH PREFIX: PARTIAL-DATA, OR HAS START OR END IN ITS PREFIX");
                                        mode = 0;
                                    }
                                    break;
                            }
                        }
                    }
                    Array.Clear(buffer, 0, buffer.Length);
                }
            }
        }
        await Stop(hub, clientId);
    }
    catch (WebSocketException e)
    {
        Debug.WriteLine("Websocket client closed without calling abort.");
        Debug.WriteLine(e.ToString());
        await Stop(hub, clientId);
    }
}

最后，结果如下：

从之前的测试中，我可以看出只收到了部分发送字符串。

这告诉我它仍然使用默认的4 kb缓冲区。我不知道如何解决这个问题。

Answer 1

https://github.com/aspnet/Home/issues/3206问题解决了，一直都是我。

WebSocketOptions忽略接收缓冲区大小

1 个答案: