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269 lines
8.9 KiB
269 lines
8.9 KiB
#nullable disable
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#pragma warning disable CS1591, SA1306, SA1401
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Net.WebSockets;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Model.Net;
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using MediaBrowser.Model.Session;
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using Microsoft.AspNetCore.Http;
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using Microsoft.Extensions.Logging;
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namespace MediaBrowser.Controller.Net
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{
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/// <summary>
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/// Starts sending data over a web socket periodically when a message is received, and then stops when a corresponding stop message is received.
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/// </summary>
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/// <typeparam name="TReturnDataType">The type of the T return data type.</typeparam>
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/// <typeparam name="TStateType">The type of the T state type.</typeparam>
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public abstract class BasePeriodicWebSocketListener<TReturnDataType, TStateType> : IWebSocketListener, IDisposable
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where TStateType : WebSocketListenerState, new()
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where TReturnDataType : class
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{
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/// <summary>
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/// The _active connections.
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/// </summary>
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private readonly List<Tuple<IWebSocketConnection, CancellationTokenSource, TStateType>> _activeConnections =
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new List<Tuple<IWebSocketConnection, CancellationTokenSource, TStateType>>();
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/// <summary>
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/// The logger.
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/// </summary>
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protected ILogger<BasePeriodicWebSocketListener<TReturnDataType, TStateType>> Logger;
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protected BasePeriodicWebSocketListener(ILogger<BasePeriodicWebSocketListener<TReturnDataType, TStateType>> logger)
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{
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ArgumentNullException.ThrowIfNull(logger);
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Logger = logger;
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}
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/// <summary>
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/// Gets the type used for the messages sent to the client.
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/// </summary>
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/// <value>The type.</value>
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protected abstract SessionMessageType Type { get; }
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/// <summary>
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/// Gets the message type received from the client to start sending messages.
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/// </summary>
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/// <value>The type.</value>
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protected abstract SessionMessageType StartType { get; }
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/// <summary>
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/// Gets the message type received from the client to stop sending messages.
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/// </summary>
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/// <value>The type.</value>
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protected abstract SessionMessageType StopType { get; }
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/// <summary>
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/// Gets the data to send.
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/// </summary>
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/// <returns>Task{`1}.</returns>
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protected abstract Task<TReturnDataType> GetDataToSend();
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/// <summary>
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/// Processes the message.
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/// </summary>
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/// <param name="message">The message.</param>
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/// <returns>Task.</returns>
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public Task ProcessMessageAsync(WebSocketMessageInfo message)
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{
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ArgumentNullException.ThrowIfNull(message);
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if (message.MessageType == StartType)
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{
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Start(message);
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}
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if (message.MessageType == StopType)
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{
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Stop(message);
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}
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return Task.CompletedTask;
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}
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/// <inheritdoc />
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public Task ProcessWebSocketConnectedAsync(IWebSocketConnection connection, HttpContext httpContext) => Task.CompletedTask;
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/// <summary>
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/// Starts sending messages over a web socket.
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/// </summary>
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/// <param name="message">The message.</param>
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private void Start(WebSocketMessageInfo message)
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{
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var vals = message.Data.Split(',');
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var dueTimeMs = long.Parse(vals[0], CultureInfo.InvariantCulture);
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var periodMs = long.Parse(vals[1], CultureInfo.InvariantCulture);
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var cancellationTokenSource = new CancellationTokenSource();
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Logger.LogDebug("WS {1} begin transmitting to {0}", message.Connection.RemoteEndPoint, GetType().Name);
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var state = new TStateType
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{
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IntervalMs = periodMs,
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InitialDelayMs = dueTimeMs
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};
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lock (_activeConnections)
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{
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_activeConnections.Add(new Tuple<IWebSocketConnection, CancellationTokenSource, TStateType>(message.Connection, cancellationTokenSource, state));
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}
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}
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protected async Task SendData(bool force)
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{
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Tuple<IWebSocketConnection, CancellationTokenSource, TStateType>[] tuples;
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lock (_activeConnections)
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{
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tuples = _activeConnections
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.Where(c =>
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{
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if (c.Item1.State == WebSocketState.Open && !c.Item2.IsCancellationRequested)
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{
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var state = c.Item3;
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if (force || (DateTime.UtcNow - state.DateLastSendUtc).TotalMilliseconds >= state.IntervalMs)
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{
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return true;
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}
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}
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return false;
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})
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.ToArray();
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}
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IEnumerable<Task> GetTasks()
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{
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foreach (var tuple in tuples)
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{
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yield return SendData(tuple);
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}
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}
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await Task.WhenAll(GetTasks()).ConfigureAwait(false);
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}
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private async Task SendData(Tuple<IWebSocketConnection, CancellationTokenSource, TStateType> tuple)
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{
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var connection = tuple.Item1;
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try
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{
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var state = tuple.Item3;
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var cancellationToken = tuple.Item2.Token;
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var data = await GetDataToSend().ConfigureAwait(false);
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if (data != null)
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{
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await connection.SendAsync(
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new WebSocketMessage<TReturnDataType>
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{
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MessageId = Guid.NewGuid(),
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MessageType = Type,
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Data = data
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},
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cancellationToken).ConfigureAwait(false);
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state.DateLastSendUtc = DateTime.UtcNow;
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}
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}
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catch (OperationCanceledException)
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{
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if (tuple.Item2.IsCancellationRequested)
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{
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DisposeConnection(tuple);
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}
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}
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catch (Exception ex)
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{
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Logger.LogError(ex, "Error sending web socket message {Name}", Type);
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DisposeConnection(tuple);
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}
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}
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/// <summary>
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/// Stops sending messages over a web socket.
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/// </summary>
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/// <param name="message">The message.</param>
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private void Stop(WebSocketMessageInfo message)
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{
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lock (_activeConnections)
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{
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var connection = _activeConnections.FirstOrDefault(c => c.Item1 == message.Connection);
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if (connection != null)
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{
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DisposeConnection(connection);
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}
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}
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}
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/// <summary>
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/// Disposes the connection.
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/// </summary>
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/// <param name="connection">The connection.</param>
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private void DisposeConnection(Tuple<IWebSocketConnection, CancellationTokenSource, TStateType> connection)
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{
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Logger.LogDebug("WS {1} stop transmitting to {0}", connection.Item1.RemoteEndPoint, GetType().Name);
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// TODO disposing the connection seems to break websockets in subtle ways, so what is the purpose of this function really...
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// connection.Item1.Dispose();
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try
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{
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connection.Item2.Cancel();
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connection.Item2.Dispose();
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}
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catch (ObjectDisposedException)
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{
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// TODO Investigate and properly fix.
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}
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lock (_activeConnections)
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{
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_activeConnections.Remove(connection);
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}
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}
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/// <summary>
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/// Releases unmanaged and - optionally - managed resources.
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/// </summary>
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/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
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protected virtual void Dispose(bool dispose)
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{
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if (dispose)
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{
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lock (_activeConnections)
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{
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foreach (var connection in _activeConnections.ToArray())
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{
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DisposeConnection(connection);
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}
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}
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}
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}
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/// <summary>
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/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
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/// </summary>
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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}
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}
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