jellyfin-server/Emby.Server.Implementations/Session/WebSocketController.cs

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using MediaBrowser.Controller.Net;
using MediaBrowser.Controller.Session;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Net;
using MediaBrowser.Model.Session;
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using MediaBrowser.Model.System;
using System;
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using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
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namespace Emby.Server.Implementations.Session
{
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public class WebSocketController : ISessionController, IDisposable
{
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public SessionInfo Session { get; private set; }
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public IReadOnlyList<IWebSocketConnection> Sockets { get; private set; }
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private readonly ILogger _logger;
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private readonly ISessionManager _sessionManager;
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public WebSocketController(SessionInfo session, ILogger logger, ISessionManager sessionManager)
{
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Session = session;
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_logger = logger;
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_sessionManager = sessionManager;
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Sockets = new List<IWebSocketConnection>();
}
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private bool HasOpenSockets
{
get { return GetActiveSockets().Any(); }
}
public bool SupportsMediaControl
{
get { return HasOpenSockets; }
}
private bool _isActive;
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private DateTime _lastActivityDate;
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public bool IsSessionActive
{
get
{
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if (HasOpenSockets)
{
return true;
}
//return false;
return _isActive && (DateTime.UtcNow - _lastActivityDate).TotalMinutes <= 10;
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}
}
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public void OnActivity()
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{
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_isActive = true;
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_lastActivityDate = DateTime.UtcNow;
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}
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private IEnumerable<IWebSocketConnection> GetActiveSockets()
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{
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return Sockets
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.OrderByDescending(i => i.LastActivityDate)
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.Where(i => i.State == WebSocketState.Open);
}
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public void AddWebSocket(IWebSocketConnection connection)
{
var sockets = Sockets.ToList();
sockets.Add(connection);
Sockets = sockets;
connection.Closed += connection_Closed;
}
void connection_Closed(object sender, EventArgs e)
{
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if (!GetActiveSockets().Any())
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{
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_isActive = false;
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try
{
_sessionManager.ReportSessionEnded(Session.Id);
}
catch (Exception ex)
{
_logger.ErrorException("Error reporting session ended.", ex);
}
}
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}
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private IWebSocketConnection GetActiveSocket()
{
var socket = GetActiveSockets()
.FirstOrDefault();
if (socket == null)
{
throw new InvalidOperationException("The requested session does not have an open web socket.");
}
return socket;
}
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public Task SendPlayCommand(PlayRequest command, CancellationToken cancellationToken)
{
return SendMessageInternal(new WebSocketMessage<PlayRequest>
{
MessageType = "Play",
Data = command
}, cancellationToken);
}
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public Task SendPlaystateCommand(PlaystateRequest command, CancellationToken cancellationToken)
{
return SendMessageInternal(new WebSocketMessage<PlaystateRequest>
{
MessageType = "Playstate",
Data = command
}, cancellationToken);
}
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public Task SendLibraryUpdateInfo(LibraryUpdateInfo info, CancellationToken cancellationToken)
{
return SendMessagesInternal(new WebSocketMessage<LibraryUpdateInfo>
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{
MessageType = "LibraryChanged",
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Data = info
}, cancellationToken);
}
/// <summary>
/// Sends the restart required message.
/// </summary>
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/// <param name="info">The information.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
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public Task SendRestartRequiredNotification(SystemInfo info, CancellationToken cancellationToken)
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{
return SendMessagesInternal(new WebSocketMessage<SystemInfo>
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{
MessageType = "RestartRequired",
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Data = info
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}, cancellationToken);
}
/// <summary>
/// Sends the user data change info.
/// </summary>
/// <param name="info">The info.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
public Task SendUserDataChangeInfo(UserDataChangeInfo info, CancellationToken cancellationToken)
{
return SendMessagesInternal(new WebSocketMessage<UserDataChangeInfo>
{
MessageType = "UserDataChanged",
Data = info
}, cancellationToken);
}
/// <summary>
/// Sends the server shutdown notification.
/// </summary>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
public Task SendServerShutdownNotification(CancellationToken cancellationToken)
{
return SendMessagesInternal(new WebSocketMessage<string>
{
MessageType = "ServerShuttingDown",
Data = string.Empty
}, cancellationToken);
}
/// <summary>
/// Sends the server restart notification.
/// </summary>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
public Task SendServerRestartNotification(CancellationToken cancellationToken)
{
return SendMessagesInternal(new WebSocketMessage<string>
{
MessageType = "ServerRestarting",
Data = string.Empty
}, cancellationToken);
}
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public Task SendGeneralCommand(GeneralCommand command, CancellationToken cancellationToken)
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{
return SendMessageInternal(new WebSocketMessage<GeneralCommand>
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{
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MessageType = "GeneralCommand",
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Data = command
}, cancellationToken);
}
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public Task SendSessionEndedNotification(SessionInfoDto sessionInfo, CancellationToken cancellationToken)
{
return SendMessagesInternal(new WebSocketMessage<SessionInfoDto>
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{
MessageType = "SessionEnded",
Data = sessionInfo
}, cancellationToken);
}
public Task SendPlaybackStartNotification(SessionInfoDto sessionInfo, CancellationToken cancellationToken)
{
return SendMessagesInternal(new WebSocketMessage<SessionInfoDto>
{
MessageType = "PlaybackStart",
Data = sessionInfo
}, cancellationToken);
}
public Task SendPlaybackStoppedNotification(SessionInfoDto sessionInfo, CancellationToken cancellationToken)
{
return SendMessagesInternal(new WebSocketMessage<SessionInfoDto>
{
MessageType = "PlaybackStopped",
Data = sessionInfo
}, cancellationToken);
}
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public Task SendMessage<T>(string name, T data, CancellationToken cancellationToken)
{
return SendMessagesInternal(new WebSocketMessage<T>
{
Data = data,
MessageType = name
}, cancellationToken);
}
private Task SendMessageInternal<T>(WebSocketMessage<T> message, CancellationToken cancellationToken)
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{
var socket = GetActiveSocket();
return socket.SendAsync(message, cancellationToken);
}
private Task SendMessagesInternal<T>(WebSocketMessage<T> message, CancellationToken cancellationToken)
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{
var tasks = GetActiveSockets().Select(i => Task.Run(async () =>
{
try
{
await i.SendAsync(message, cancellationToken).ConfigureAwait(false);
}
catch (Exception ex)
{
_logger.ErrorException("Error sending web socket message", ex);
}
}, cancellationToken));
return Task.WhenAll(tasks);
}
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public void Dispose()
{
foreach (var socket in Sockets.ToList())
{
socket.Closed -= connection_Closed;
}
}
}
}