93 lines
3.8 KiB
C#
93 lines
3.8 KiB
C#
using System;
|
|
using System.Text;
|
|
using System.Threading;
|
|
using System.Threading.Tasks;
|
|
using System.Net;
|
|
using System.Net.WebSockets;
|
|
|
|
namespace Ooui
|
|
{
|
|
public class Server
|
|
{
|
|
public Task RunAsync (string listenerPrefix)
|
|
{
|
|
return RunAsync (listenerPrefix, CancellationToken.None);
|
|
}
|
|
|
|
public async Task RunAsync (string listenerPrefix, CancellationToken token)
|
|
{
|
|
var listener = new HttpListener ();
|
|
listener.Prefixes.Add (listenerPrefix);
|
|
listener.Start ();
|
|
Console.WriteLine ($"Listening at {listenerPrefix}...");
|
|
|
|
while (!token.IsCancellationRequested) {
|
|
var listenerContext = await listener.GetContextAsync ();
|
|
if (listenerContext.Request.IsWebSocketRequest) {
|
|
ProcessWebSocketRequest (listenerContext, token);
|
|
}
|
|
else {
|
|
listenerContext.Response.StatusCode = 400;
|
|
listenerContext.Response.Close ();
|
|
}
|
|
}
|
|
}
|
|
|
|
async void ProcessWebSocketRequest (HttpListenerContext listenerContext, CancellationToken token)
|
|
{
|
|
WebSocketContext webSocketContext = null;
|
|
try {
|
|
webSocketContext = await listenerContext.AcceptWebSocketAsync(subProtocol: null);
|
|
Console.WriteLine ("Accepted WebSocket: {0}", webSocketContext);
|
|
}
|
|
catch (Exception e) {
|
|
listenerContext.Response.StatusCode = 500;
|
|
listenerContext.Response.Close();
|
|
Console.WriteLine ("Failed to accept WebSocket: {0}", e);
|
|
return;
|
|
}
|
|
|
|
WebSocket webSocket = null;
|
|
|
|
try {
|
|
webSocket = webSocketContext.WebSocket;
|
|
|
|
var receiveBuffer = new byte[1024];
|
|
|
|
while (webSocket.State == WebSocketState.Open && !token.IsCancellationRequested) {
|
|
var receiveResult = await webSocket.ReceiveAsync(new ArraySegment<byte>(receiveBuffer), token);
|
|
|
|
if (receiveResult.MessageType == WebSocketMessageType.Close) {
|
|
await webSocket.CloseAsync (WebSocketCloseStatus.NormalClosure, "", token);
|
|
}
|
|
else if (receiveResult.MessageType == WebSocketMessageType.Binary) {
|
|
await webSocket.CloseAsync (WebSocketCloseStatus.InvalidMessageType, "Cannot accept binary frame", token);
|
|
}
|
|
else {
|
|
var size = receiveResult.Count;
|
|
while (!receiveResult.EndOfMessage) {
|
|
if (size >= receiveBuffer.Length) {
|
|
await webSocket.CloseAsync (WebSocketCloseStatus.MessageTooBig, "Message too big", token);
|
|
return;
|
|
}
|
|
receiveResult = await webSocket.ReceiveAsync (new ArraySegment<byte>(receiveBuffer, size, receiveBuffer.Length - size), token);
|
|
size += receiveResult.Count;
|
|
}
|
|
var receivedString = Encoding.UTF8.GetString (receiveBuffer, 0, size);
|
|
Console.WriteLine ("RECEIVED: {0}", receivedString);
|
|
|
|
var outputBuffer = new ArraySegment<byte> (Encoding.UTF8.GetBytes ($"You said: {receivedString}"));
|
|
await webSocket.SendAsync (outputBuffer, WebSocketMessageType.Text, true, token);
|
|
}
|
|
}
|
|
}
|
|
catch (Exception e) {
|
|
Console.WriteLine ("Exception: {0}", e);
|
|
}
|
|
finally {
|
|
webSocket?.Dispose();
|
|
}
|
|
}
|
|
}
|
|
}
|