🧱 Vide coded the websocket controller
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@ -1,4 +1,6 @@
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using System.Collections.Concurrent;
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using System.Net.WebSockets;
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using DysonNetwork.Sphere.Account;
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using Microsoft.AspNetCore.Authorization;
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using Microsoft.AspNetCore.Mvc;
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@ -7,44 +9,100 @@ namespace DysonNetwork.Sphere.Connection;
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[ApiController]
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[Route("/ws")]
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public class WebSocketController : ControllerBase
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{
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{
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// Concurrent dictionary to store active WebSocket connections.
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// Key: Tuple (AccountId, DeviceId); Value: WebSocket and CancellationTokenSource
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private static readonly ConcurrentDictionary<(long AccountId, string DeviceId), (WebSocket Socket, CancellationTokenSource Cts)> ActiveConnections = new ConcurrentDictionary<(long, string), (WebSocket, CancellationTokenSource)>();
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[Route("/ws")]
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[Authorize]
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public async Task TheGateway()
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public async Task TheGateway([FromQuery] string deviceId)
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{
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if (HttpContext.WebSockets.IsWebSocketRequest)
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{
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using var webSocket = await HttpContext.WebSockets.AcceptWebSocketAsync();
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await _ConnectionEventLoop(webSocket);
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// Get AccountId from HttpContext
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if (!HttpContext.Items.TryGetValue("CurrentUser", out var currentUserValue) || currentUserValue is not Account.Account currentUser)
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{
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HttpContext.Response.StatusCode = StatusCodes.Status401Unauthorized;
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return;
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}
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long accountId = currentUser.Id;
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// Verify deviceId
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if (string.IsNullOrEmpty(deviceId))
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{
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HttpContext.Response.StatusCode = StatusCodes.Status400BadRequest;
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return;
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}
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using var webSocket = await HttpContext.WebSockets.AcceptWebSocketAsync();
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// Create a CancellationTokenSource for this connection
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var cts = new CancellationTokenSource();
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var connectionKey = (accountId, deviceId);
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// Add the connection to the active connections dictionary
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if (!ActiveConnections.TryAdd(connectionKey, (webSocket, cts)))
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{
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// Failed to add
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await webSocket.CloseAsync(WebSocketCloseStatus.InternalServerError, "Failed to establish connection.", CancellationToken.None);
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return;
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}
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try
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{
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await _ConnectionEventLoop(webSocket, connectionKey, cts.Token);
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}
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catch (Exception ex)
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{
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Console.WriteLine($"WebSocket Error: {ex.Message}");
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}
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finally
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{
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// Connection is closed, remove it from the active connections dictionary
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ActiveConnections.TryRemove(connectionKey, out _);
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cts.Dispose();
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}
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}
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else
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{
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HttpContext.Response.StatusCode = StatusCodes.Status400BadRequest;
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}
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}
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private static async Task _ConnectionEventLoop(WebSocket webSocket)
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private static async Task _ConnectionEventLoop(WebSocket webSocket, (long AccountId, string DeviceId) connectionKey, CancellationToken cancellationToken)
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{
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// For now, it's echo
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var buffer = new byte[1024 * 4];
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var receiveResult = await webSocket.ReceiveAsync(
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new ArraySegment<byte>(buffer), CancellationToken.None);
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while (!receiveResult.CloseStatus.HasValue)
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// Buffer for receiving messages.
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var buffer = new byte[1024 * 4];
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try
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{
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await webSocket.SendAsync(
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new ArraySegment<byte>(buffer, 0, receiveResult.Count),
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receiveResult.MessageType,
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receiveResult.EndOfMessage,
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CancellationToken.None);
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// We don't handle receiving data, so we ignore the return.
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var receiveResult = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), cancellationToken);
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while (!receiveResult.CloseStatus.HasValue)
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{
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// Keep connection alive and wait for close requests
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receiveResult = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), cancellationToken);
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}
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receiveResult = await webSocket.ReceiveAsync(
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new ArraySegment<byte>(buffer), CancellationToken.None);
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// Close connection
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await webSocket.CloseAsync(receiveResult.CloseStatus.Value, receiveResult.CloseStatusDescription, cancellationToken);
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}
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catch (OperationCanceledException)
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{
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// Connection was canceled, close it gracefully
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if (webSocket.State != WebSocketState.Closed && webSocket.State != WebSocketState.Aborted)
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{
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await webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "Connection closed by server", CancellationToken.None);
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}
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}
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}
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await webSocket.CloseAsync(
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receiveResult.CloseStatus.Value,
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receiveResult.CloseStatusDescription,
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CancellationToken.None);
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// This method will be used later to send messages to specific connections
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public static async Task SendMessageAsync(long accountId, string deviceId, string message)
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{
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if (ActiveConnections.TryGetValue((accountId, deviceId), out var connection))
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{
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var buffer = System.Text.Encoding.UTF8.GetBytes(message);
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await connection.Socket.SendAsync(new ArraySegment<byte>(buffer, 0, buffer.Length), WebSocketMessageType.Text, true, connection.Cts.Token);
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}
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}
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}
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