/// <summary>
/// 部分Handler过程参考：http://www.cnblogs.com/lookbs/p/MVC-IMG.html
/// </summary>
/// <param name="webSocketContext"></param>
/// <returns></returns>
public static async Task WebSocketRequestHandler(AspNetWebSocketContext webSocketContext)
{
//Gets the current WebSocket object.
System.Net.WebSockets.WebSocket webSocket = webSocketContext.WebSocket;
/*We define a certain constant which will represent
* size of received data. It is established by us and
* we can set any value. We know that in this case the size of the sent
* data is very small.
*/
const int maxMessageSize = 1024;
//Buffer for received bits.
var receivedDataBuffer = new ArraySegment <Byte>(new Byte[maxMessageSize]);
var cancellationToken = new CancellationToken();
WebSocketHelper webSocketHandler = new WebSocketHelper(webSocketContext, cancellationToken);
var messageHandler = WebSocketConfig.WebSocketMessageHandlerFunc.Invoke();
if (webSocket.State == WebSocketState.Connecting)
{
if (WebSocketConfig.WebSocketMessageHandlerFunc != null)
{
await messageHandler.OnConnecting(webSocketHandler);//调用MessageHandler
}
}
//Checks WebSocket state.
while (webSocket.State == WebSocketState.Open)
{
//Reads data.
WebSocketReceiveResult webSocketReceiveResult =
await webSocket.ReceiveAsync(receivedDataBuffer, cancellationToken);
//If input frame is cancelation frame, send close command.
if (webSocketReceiveResult.MessageType == WebSocketMessageType.Close)
{
if (WebSocketConfig.WebSocketMessageHandlerFunc != null)
{
await messageHandler.OnDisConnected(webSocketHandler);//调用MessageHandler
}
await webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure,
String.Empty, cancellationToken);
}
else
{
byte[] payloadData = receivedDataBuffer.Array
.Where(b => b != 0)
.Take(webSocketReceiveResult.Count)
.ToArray();
if (WebSocketConfig.WebSocketMessageHandlerFunc != null)
{
//Because we know that is a string, we convert it.
string receiveString =
//System.Text.Encoding.UTF8.GetString(payloadData, 0, payloadData.Length);
System.Text.Encoding.UTF8.GetString(payloadData, 0, payloadData.Length);
try
{
ReceivedMessage receivedMessage;
try
{
receivedMessage = new ReceivedMessage()
{
Message = receiveString// + " | 系统错误：" + e.Message
};
receivedMessage = Newtonsoft.Json.JsonConvert.DeserializeObject <ReceivedMessage>(receiveString);
}
catch (Exception e)
{
receivedMessage = new ReceivedMessage()
{
Message = receiveString// + " | 系统错误：" + e.Message
};
}
await messageHandler.OnMessageReceiced(webSocketHandler, receivedMessage, receiveString);//调用MessageHandler
}
catch (Exception ex)
{
}
}
}
}
}
/// <summary>
/// 断开连接时触发事件
/// </summary>
/// <param name="webSocketHandler"></param>
/// <returns></returns>
public virtual Task OnDisConnected(WebSocketHelper webSocketHandler)
{
return(null);
}
/// <summary> /// 收到消息时触发事件 /// </summary> /// <param name="webSocketHandler"></param> /// <param name="message">封装好的数据</param> /// <param name="originalData">原始数据字符串</param> /// <returns></returns> public abstract Task OnMessageReceiced(WebSocketHelper webSocketHandler, ReceivedMessage message, string originalData);
/// <summary>
/// 连接时触发事件
/// </summary>
/// <param name="webSocketHandler"></param>
/// <returns></returns>
public virtual Task OnConnecting(WebSocketHelper webSocketHandler)
{
return(null);
}