| | | 1 | | #nullable disable |
| | | 2 | | |
| | | 3 | | #pragma warning disable CS1591, SA1306, SA1401 |
| | | 4 | | |
| | | 5 | | using System; |
| | | 6 | | using System.Collections.Generic; |
| | | 7 | | using System.Globalization; |
| | | 8 | | using System.Linq; |
| | | 9 | | using System.Net.WebSockets; |
| | | 10 | | using System.Threading; |
| | | 11 | | using System.Threading.Channels; |
| | | 12 | | using System.Threading.Tasks; |
| | | 13 | | using MediaBrowser.Controller.Net.WebSocketMessages; |
| | | 14 | | using MediaBrowser.Model.Session; |
| | | 15 | | using Microsoft.AspNetCore.Http; |
| | | 16 | | using Microsoft.Extensions.Logging; |
| | | 17 | | |
| | | 18 | | namespace MediaBrowser.Controller.Net |
| | | 19 | | { |
| | | 20 | | /// <summary> |
| | | 21 | | /// Starts sending data over a web socket periodically when a message is received, and then stops when a correspondi |
| | | 22 | | /// </summary> |
| | | 23 | | /// <typeparam name="TReturnDataType">The type of the T return data type.</typeparam> |
| | | 24 | | /// <typeparam name="TStateType">The type of the T state type.</typeparam> |
| | | 25 | | public abstract class BasePeriodicWebSocketListener<TReturnDataType, TStateType> : IWebSocketListener, IAsyncDisposa |
| | | 26 | | where TStateType : WebSocketListenerState, new() |
| | | 27 | | where TReturnDataType : class |
| | | 28 | | { |
| | 57 | 29 | | private readonly Channel<bool> _channel = Channel.CreateUnbounded<bool>(new UnboundedChannelOptions |
| | 57 | 30 | | { |
| | 57 | 31 | | AllowSynchronousContinuations = false, |
| | 57 | 32 | | SingleReader = true, |
| | 57 | 33 | | SingleWriter = false |
| | 57 | 34 | | }); |
| | | 35 | | |
| | 57 | 36 | | private readonly Lock _activeConnectionsLock = new(); |
| | | 37 | | |
| | | 38 | | /// <summary> |
| | | 39 | | /// The _active connections. |
| | | 40 | | /// </summary> |
| | 57 | 41 | | private readonly List<(IWebSocketConnection Connection, CancellationTokenSource CancellationTokenSource, TStateT |
| | | 42 | | |
| | | 43 | | /// <summary> |
| | | 44 | | /// The logger. |
| | | 45 | | /// </summary> |
| | | 46 | | protected readonly ILogger<BasePeriodicWebSocketListener<TReturnDataType, TStateType>> Logger; |
| | | 47 | | |
| | | 48 | | private readonly Task _messageConsumerTask; |
| | | 49 | | |
| | | 50 | | protected BasePeriodicWebSocketListener(ILogger<BasePeriodicWebSocketListener<TReturnDataType, TStateType>> logg |
| | | 51 | | { |
| | 57 | 52 | | ArgumentNullException.ThrowIfNull(logger); |
| | | 53 | | |
| | 57 | 54 | | Logger = logger; |
| | | 55 | | |
| | 57 | 56 | | _messageConsumerTask = HandleMessages(); |
| | 57 | 57 | | } |
| | | 58 | | |
| | | 59 | | /// <summary> |
| | | 60 | | /// Gets the type used for the messages sent to the client. |
| | | 61 | | /// </summary> |
| | | 62 | | /// <value>The type.</value> |
| | | 63 | | protected abstract SessionMessageType Type { get; } |
| | | 64 | | |
| | | 65 | | /// <summary> |
| | | 66 | | /// Gets the message type received from the client to start sending messages. |
| | | 67 | | /// </summary> |
| | | 68 | | /// <value>The type.</value> |
| | | 69 | | protected abstract SessionMessageType StartType { get; } |
| | | 70 | | |
| | | 71 | | /// <summary> |
| | | 72 | | /// Gets the message type received from the client to stop sending messages. |
| | | 73 | | /// </summary> |
| | | 74 | | /// <value>The type.</value> |
| | | 75 | | protected abstract SessionMessageType StopType { get; } |
| | | 76 | | |
| | | 77 | | /// <summary> |
| | | 78 | | /// Gets the data to send. |
| | | 79 | | /// </summary> |
| | | 80 | | /// <returns>Task{`1}.</returns> |
| | | 81 | | protected abstract Task<TReturnDataType> GetDataToSend(); |
| | | 82 | | |
| | | 83 | | /// <summary> |
| | | 84 | | /// Processes the message. |
| | | 85 | | /// </summary> |
| | | 86 | | /// <param name="message">The message.</param> |
| | | 87 | | /// <returns>Task.</returns> |
| | | 88 | | public Task ProcessMessageAsync(WebSocketMessageInfo message) |
| | | 89 | | { |
| | 0 | 90 | | ArgumentNullException.ThrowIfNull(message); |
| | | 91 | | |
| | 0 | 92 | | if (message.MessageType == StartType) |
| | | 93 | | { |
| | 0 | 94 | | Start(message); |
| | | 95 | | } |
| | | 96 | | |
| | 0 | 97 | | if (message.MessageType == StopType) |
| | | 98 | | { |
| | 0 | 99 | | Stop(message); |
| | | 100 | | } |
| | | 101 | | |
| | 0 | 102 | | return Task.CompletedTask; |
| | | 103 | | } |
| | | 104 | | |
| | | 105 | | /// <inheritdoc /> |
| | 0 | 106 | | public Task ProcessWebSocketConnectedAsync(IWebSocketConnection connection, HttpContext httpContext) => Task.Com |
| | | 107 | | |
| | | 108 | | /// <summary> |
| | | 109 | | /// Starts sending messages over a web socket. |
| | | 110 | | /// </summary> |
| | | 111 | | /// <param name="message">The message.</param> |
| | | 112 | | protected virtual void Start(WebSocketMessageInfo message) |
| | | 113 | | { |
| | 0 | 114 | | var vals = message.Data.Split(','); |
| | | 115 | | |
| | 0 | 116 | | var dueTimeMs = long.Parse(vals[0], CultureInfo.InvariantCulture); |
| | 0 | 117 | | var periodMs = long.Parse(vals[1], CultureInfo.InvariantCulture); |
| | | 118 | | |
| | 0 | 119 | | var cancellationTokenSource = new CancellationTokenSource(); |
| | | 120 | | |
| | 0 | 121 | | Logger.LogDebug("WS {1} begin transmitting to {0}", message.Connection.RemoteEndPoint, GetType().Name); |
| | | 122 | | |
| | 0 | 123 | | var state = new TStateType |
| | 0 | 124 | | { |
| | 0 | 125 | | IntervalMs = periodMs, |
| | 0 | 126 | | InitialDelayMs = dueTimeMs |
| | 0 | 127 | | }; |
| | | 128 | | |
| | | 129 | | lock (_activeConnectionsLock) |
| | | 130 | | { |
| | 0 | 131 | | _activeConnections.Add((message.Connection, cancellationTokenSource, state)); |
| | 0 | 132 | | } |
| | 0 | 133 | | } |
| | | 134 | | |
| | | 135 | | protected void SendData(bool force) |
| | | 136 | | { |
| | 221 | 137 | | _channel.Writer.TryWrite(force); |
| | 221 | 138 | | } |
| | | 139 | | |
| | | 140 | | private async Task HandleMessages() |
| | | 141 | | { |
| | | 142 | | while (await _channel.Reader.WaitToReadAsync().ConfigureAwait(false)) |
| | | 143 | | { |
| | | 144 | | while (_channel.Reader.TryRead(out var force)) |
| | | 145 | | { |
| | | 146 | | try |
| | | 147 | | { |
| | | 148 | | (IWebSocketConnection Connection, CancellationTokenSource CancellationTokenSource, TStateType St |
| | | 149 | | |
| | | 150 | | var now = DateTime.UtcNow; |
| | | 151 | | lock (_activeConnectionsLock) |
| | | 152 | | { |
| | | 153 | | if (_activeConnections.Count == 0) |
| | | 154 | | { |
| | | 155 | | continue; |
| | | 156 | | } |
| | | 157 | | |
| | | 158 | | tuples = _activeConnections |
| | | 159 | | .Where(c => |
| | | 160 | | { |
| | | 161 | | if (c.Connection.State != WebSocketState.Open || c.CancellationTokenSource.IsCancell |
| | | 162 | | { |
| | | 163 | | return false; |
| | | 164 | | } |
| | | 165 | | |
| | | 166 | | var state = c.State; |
| | | 167 | | return force || (now - state.DateLastSendUtc).TotalMilliseconds >= state.IntervalMs; |
| | | 168 | | }) |
| | | 169 | | .ToArray(); |
| | | 170 | | } |
| | | 171 | | |
| | | 172 | | if (tuples.Length == 0) |
| | | 173 | | { |
| | | 174 | | continue; |
| | | 175 | | } |
| | | 176 | | |
| | | 177 | | var data = await GetDataToSend().ConfigureAwait(false); |
| | | 178 | | if (data is null) |
| | | 179 | | { |
| | | 180 | | continue; |
| | | 181 | | } |
| | | 182 | | |
| | | 183 | | IEnumerable<Task> GetTasks() |
| | | 184 | | { |
| | | 185 | | foreach (var tuple in tuples) |
| | | 186 | | { |
| | | 187 | | yield return SendDataInternal(data, tuple); |
| | | 188 | | } |
| | | 189 | | } |
| | | 190 | | |
| | | 191 | | await Task.WhenAll(GetTasks()).ConfigureAwait(false); |
| | | 192 | | } |
| | | 193 | | catch (Exception ex) |
| | | 194 | | { |
| | | 195 | | Logger.LogError(ex, "Failed to send updates to websockets"); |
| | | 196 | | } |
| | | 197 | | } |
| | | 198 | | } |
| | | 199 | | } |
| | | 200 | | |
| | | 201 | | private async Task SendDataInternal(TReturnDataType data, (IWebSocketConnection Connection, CancellationTokenSou |
| | | 202 | | { |
| | | 203 | | try |
| | | 204 | | { |
| | | 205 | | var (connection, cts, state) = tuple; |
| | | 206 | | var cancellationToken = cts.Token; |
| | | 207 | | await connection.SendAsync( |
| | | 208 | | new OutboundWebSocketMessage<TReturnDataType> { MessageType = Type, Data = data }, |
| | | 209 | | cancellationToken).ConfigureAwait(false); |
| | | 210 | | |
| | | 211 | | state.DateLastSendUtc = DateTime.UtcNow; |
| | | 212 | | } |
| | | 213 | | catch (OperationCanceledException) |
| | | 214 | | { |
| | | 215 | | if (tuple.CancellationTokenSource.IsCancellationRequested) |
| | | 216 | | { |
| | | 217 | | DisposeConnection(tuple); |
| | | 218 | | } |
| | | 219 | | } |
| | | 220 | | catch (Exception ex) |
| | | 221 | | { |
| | | 222 | | Logger.LogError(ex, "Error sending web socket message {Name}", Type); |
| | | 223 | | DisposeConnection(tuple); |
| | | 224 | | } |
| | | 225 | | } |
| | | 226 | | |
| | | 227 | | /// <summary> |
| | | 228 | | /// Stops sending messages over a web socket. |
| | | 229 | | /// </summary> |
| | | 230 | | /// <param name="message">The message.</param> |
| | | 231 | | private void Stop(WebSocketMessageInfo message) |
| | 0 | 232 | | { |
| | | 233 | | lock (_activeConnectionsLock) |
| | | 234 | | { |
| | 0 | 235 | | var connection = _activeConnections.FirstOrDefault(c => c.Connection == message.Connection); |
| | | 236 | | |
| | 0 | 237 | | if (connection != default) |
| | | 238 | | { |
| | 0 | 239 | | DisposeConnection(connection); |
| | | 240 | | } |
| | 0 | 241 | | } |
| | 0 | 242 | | } |
| | | 243 | | |
| | | 244 | | /// <summary> |
| | | 245 | | /// Disposes the connection. |
| | | 246 | | /// </summary> |
| | | 247 | | /// <param name="connection">The connection.</param> |
| | | 248 | | private void DisposeConnection((IWebSocketConnection Connection, CancellationTokenSource CancellationTokenSource |
| | | 249 | | { |
| | 0 | 250 | | Logger.LogDebug("WS {1} stop transmitting to {0}", connection.Connection.RemoteEndPoint, GetType().Name); |
| | | 251 | | |
| | | 252 | | // TODO disposing the connection seems to break websockets in subtle ways, so what is the purpose of this fu |
| | | 253 | | // connection.Item1.Dispose(); |
| | | 254 | | |
| | | 255 | | try |
| | | 256 | | { |
| | 0 | 257 | | connection.CancellationTokenSource.Cancel(); |
| | 0 | 258 | | connection.CancellationTokenSource.Dispose(); |
| | 0 | 259 | | } |
| | 0 | 260 | | catch (ObjectDisposedException ex) |
| | | 261 | | { |
| | | 262 | | // TODO Investigate and properly fix. |
| | 0 | 263 | | Logger.LogError(ex, "Object Disposed"); |
| | 0 | 264 | | } |
| | 0 | 265 | | catch (Exception ex) |
| | | 266 | | { |
| | | 267 | | // TODO Investigate and properly fix. |
| | 0 | 268 | | Logger.LogError(ex, "Error disposing websocket"); |
| | 0 | 269 | | } |
| | | 270 | | |
| | | 271 | | lock (_activeConnectionsLock) |
| | | 272 | | { |
| | 0 | 273 | | _activeConnections.Remove(connection); |
| | 0 | 274 | | } |
| | 0 | 275 | | } |
| | | 276 | | |
| | | 277 | | protected virtual async ValueTask DisposeAsyncCore() |
| | | 278 | | { |
| | | 279 | | try |
| | | 280 | | { |
| | | 281 | | _channel.Writer.TryComplete(); |
| | | 282 | | await _messageConsumerTask.ConfigureAwait(false); |
| | | 283 | | } |
| | | 284 | | catch (Exception ex) |
| | | 285 | | { |
| | | 286 | | Logger.LogError(ex, "Disposing the message consumer failed"); |
| | | 287 | | } |
| | | 288 | | |
| | | 289 | | lock (_activeConnectionsLock) |
| | | 290 | | { |
| | | 291 | | foreach (var connection in _activeConnections.ToList()) |
| | | 292 | | { |
| | | 293 | | DisposeConnection(connection); |
| | | 294 | | } |
| | | 295 | | } |
| | | 296 | | } |
| | | 297 | | |
| | | 298 | | /// <inheritdoc /> |
| | | 299 | | public async ValueTask DisposeAsync() |
| | | 300 | | { |
| | | 301 | | await DisposeAsyncCore().ConfigureAwait(false); |
| | | 302 | | GC.SuppressFinalize(this); |
| | | 303 | | } |
| | | 304 | | } |
| | | 305 | | } |