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https://github.com/jellyfin/jellyfin.git
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Implement syncplay backend
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gion
418
Emby.Server.Implementations/Syncplay/SyncplayController.cs
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418
Emby.Server.Implementations/Syncplay/SyncplayController.cs
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Controller.Session;
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using MediaBrowser.Controller.Syncplay;
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using MediaBrowser.Model.Session;
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using MediaBrowser.Model.Syncplay;
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using Microsoft.Extensions.Logging;
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namespace Emby.Server.Implementations.Syncplay
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{
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/// <summary>
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/// Class SyncplayController.
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/// </summary>
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public class SyncplayController : ISyncplayController, IDisposable
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{
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private enum BroadcastType
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{
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AllGroup = 0,
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SingleUser = 1,
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AllExceptUser = 2,
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AllReady = 3
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}
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/// <summary>
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/// The logger.
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/// </summary>
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private readonly ILogger _logger;
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/// <summary>
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/// The session manager.
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/// </summary>
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private readonly ISessionManager _sessionManager;
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/// <summary>
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/// The syncplay manager.
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/// </summary>
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private readonly ISyncplayManager _syncplayManager;
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/// <summary>
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/// The group to manage.
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/// </summary>
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private readonly GroupInfo _group = new GroupInfo();
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/// <inheritdoc />
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public Guid GetGroupId() => _group.GroupId;
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/// <inheritdoc />
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public Guid GetPlayingItemId() => _group.PlayingItem.Id;
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/// <inheritdoc />
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public bool IsGroupEmpty() => _group.IsEmpty();
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private bool _disposed = false;
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public SyncplayController(
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ILogger logger,
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ISessionManager sessionManager,
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ISyncplayManager syncplayManager)
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{
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_logger = logger;
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_sessionManager = sessionManager;
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_syncplayManager = syncplayManager;
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}
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/// <inheritdoc />
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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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/// <summary>
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/// Releases unmanaged and optionally managed resources.
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/// </summary>
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/// <param name="disposing"><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 disposing)
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{
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if (_disposed)
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{
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return;
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}
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_disposed = true;
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}
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// TODO: use this somewhere
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private void CheckDisposed()
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{
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if (_disposed)
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{
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throw new ObjectDisposedException(GetType().Name);
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}
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}
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private SessionInfo[] FilterUsers(SessionInfo from, BroadcastType type)
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{
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if (type == BroadcastType.SingleUser)
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{
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return new SessionInfo[] { from };
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}
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else if (type == BroadcastType.AllGroup)
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{
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return _group.Partecipants.Values.Select(
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user => user.Session
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).ToArray();
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}
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else if (type == BroadcastType.AllExceptUser)
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{
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return _group.Partecipants.Values.Select(
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user => user.Session
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).Where(
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user => !user.Id.Equals(from.Id)
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).ToArray();
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}
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else if (type == BroadcastType.AllReady)
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{
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return _group.Partecipants.Values.Where(
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user => !user.IsBuffering
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).Select(
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user => user.Session
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).ToArray();
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}
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else
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{
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return new SessionInfo[] {};
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}
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}
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private Task SendGroupUpdate<T>(SessionInfo from, BroadcastType type, SyncplayGroupUpdate<T> message)
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{
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IEnumerable<Task> GetTasks()
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{
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SessionInfo[] users = FilterUsers(from, type);
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foreach (var user in users)
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{
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yield return _sessionManager.SendSyncplayGroupUpdate(user.Id.ToString(), message, CancellationToken.None);
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}
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}
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return Task.WhenAll(GetTasks());
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}
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private Task SendCommand(SessionInfo from, BroadcastType type, SyncplayCommand message)
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{
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IEnumerable<Task> GetTasks()
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{
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SessionInfo[] users = FilterUsers(from, type);
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foreach (var user in users)
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{
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yield return _sessionManager.SendSyncplayCommand(user.Id.ToString(), message, CancellationToken.None);
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}
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}
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return Task.WhenAll(GetTasks());
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}
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private SyncplayCommand NewSyncplayCommand(SyncplayCommandType type) {
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var command = new SyncplayCommand();
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command.GroupId = _group.GroupId.ToString();
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command.Command = type;
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command.PositionTicks = _group.PositionTicks;
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command.When = _group.LastActivity.ToUniversalTime().ToString("o");
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return command;
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}
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private SyncplayGroupUpdate<T> NewSyncplayGroupUpdate<T>(SyncplayGroupUpdateType type, T data)
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{
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var command = new SyncplayGroupUpdate<T>();
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command.GroupId = _group.GroupId.ToString();
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command.Type = type;
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command.Data = data;
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return command;
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}
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/// <inheritdoc />
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public void InitGroup(SessionInfo user)
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{
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_group.AddUser(user);
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_syncplayManager.MapUserToGroup(user, this);
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_group.PlayingItem = user.FullNowPlayingItem;
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_group.IsPaused = true;
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_group.PositionTicks = user.PlayState.PositionTicks ??= 0;
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_group.LastActivity = DateTime.UtcNow;
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var updateUser = NewSyncplayGroupUpdate(SyncplayGroupUpdateType.GroupJoined, DateTime.UtcNow.ToUniversalTime().ToString("o"));
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SendGroupUpdate(user, BroadcastType.SingleUser, updateUser);
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var pauseCommand = NewSyncplayCommand(SyncplayCommandType.Pause);
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SendCommand(user, BroadcastType.SingleUser, pauseCommand);
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}
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/// <inheritdoc />
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public void UserJoin(SessionInfo user)
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{
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if (user.NowPlayingItem != null && user.NowPlayingItem.Id.Equals(_group.PlayingItem.Id))
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{
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_group.AddUser(user);
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_syncplayManager.MapUserToGroup(user, this);
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var updateUser = NewSyncplayGroupUpdate(SyncplayGroupUpdateType.GroupJoined, _group.PositionTicks);
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SendGroupUpdate(user, BroadcastType.SingleUser, updateUser);
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var updateOthers = NewSyncplayGroupUpdate(SyncplayGroupUpdateType.UserJoined, user.UserName);
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SendGroupUpdate(user, BroadcastType.AllExceptUser, updateOthers);
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// Client join and play, syncing will happen client side
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if (!_group.IsPaused)
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{
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var playCommand = NewSyncplayCommand(SyncplayCommandType.Play);
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SendCommand(user, BroadcastType.SingleUser, playCommand);
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}
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else
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{
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var pauseCommand = NewSyncplayCommand(SyncplayCommandType.Pause);
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SendCommand(user, BroadcastType.SingleUser, pauseCommand);
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}
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}
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else
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{
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var playRequest = new PlayRequest();
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playRequest.ItemIds = new Guid[] { _group.PlayingItem.Id };
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playRequest.StartPositionTicks = _group.PositionTicks;
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var update = NewSyncplayGroupUpdate(SyncplayGroupUpdateType.PrepareSession, playRequest);
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SendGroupUpdate(user, BroadcastType.SingleUser, update);
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}
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}
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/// <inheritdoc />
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public void UserLeave(SessionInfo user)
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{
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_group.RemoveUser(user);
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_syncplayManager.UnmapUserFromGroup(user, this);
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var updateUser = NewSyncplayGroupUpdate(SyncplayGroupUpdateType.GroupLeft, _group.PositionTicks);
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SendGroupUpdate(user, BroadcastType.SingleUser, updateUser);
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var updateOthers = NewSyncplayGroupUpdate(SyncplayGroupUpdateType.UserLeft, user.UserName);
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SendGroupUpdate(user, BroadcastType.AllExceptUser, updateOthers);
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}
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/// <inheritdoc />
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public void HandleRequest(SessionInfo user, SyncplayRequestInfo request)
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{
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if (request.Type.Equals(SyncplayRequestType.Play))
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{
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if (_group.IsPaused)
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{
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var delay = _group.GetHighestPing() * 2;
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delay = delay < _group.DefaulPing ? _group.DefaulPing : delay;
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_group.IsPaused = false;
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_group.LastActivity = DateTime.UtcNow.AddMilliseconds(
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delay
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);
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var command = NewSyncplayCommand(SyncplayCommandType.Play);
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SendCommand(user, BroadcastType.AllGroup, command);
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}
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else
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{
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// Client got lost
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var command = NewSyncplayCommand(SyncplayCommandType.Play);
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SendCommand(user, BroadcastType.SingleUser, command);
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}
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}
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else if (request.Type.Equals(SyncplayRequestType.Pause))
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{
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if (!_group.IsPaused)
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{
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_group.IsPaused = true;
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var currentTime = DateTime.UtcNow;
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var elapsedTime = currentTime - _group.LastActivity;
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_group.LastActivity = currentTime;
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_group.PositionTicks += elapsedTime.Ticks > 0 ? elapsedTime.Ticks : 0;
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var command = NewSyncplayCommand(SyncplayCommandType.Pause);
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SendCommand(user, BroadcastType.AllGroup, command);
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}
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else
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{
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var command = NewSyncplayCommand(SyncplayCommandType.Pause);
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SendCommand(user, BroadcastType.SingleUser, command);
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}
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}
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else if (request.Type.Equals(SyncplayRequestType.Seek))
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{
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// Sanitize PositionTicks
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var ticks = request.PositionTicks ??= 0;
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ticks = ticks >= 0 ? ticks : 0;
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if (_group.PlayingItem.RunTimeTicks != null)
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{
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var runTimeTicks = _group.PlayingItem.RunTimeTicks ??= 0;
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ticks = ticks > runTimeTicks ? runTimeTicks : ticks;
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}
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_group.IsPaused = true;
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_group.PositionTicks = ticks;
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_group.LastActivity = DateTime.UtcNow;
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var command = NewSyncplayCommand(SyncplayCommandType.Seek);
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SendCommand(user, BroadcastType.AllGroup, command);
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}
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// TODO: client does not implement this yet
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else if (request.Type.Equals(SyncplayRequestType.Buffering))
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{
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if (!_group.IsPaused)
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{
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_group.IsPaused = true;
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var currentTime = DateTime.UtcNow;
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var elapsedTime = currentTime - _group.LastActivity;
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_group.LastActivity = currentTime;
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_group.PositionTicks += elapsedTime.Ticks > 0 ? elapsedTime.Ticks : 0;
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_group.SetBuffering(user, true);
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// Send pause command to all non-buffering users
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var command = NewSyncplayCommand(SyncplayCommandType.Pause);
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SendCommand(user, BroadcastType.AllReady, command);
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var updateOthers = NewSyncplayGroupUpdate(SyncplayGroupUpdateType.GroupWait, user.UserName);
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SendGroupUpdate(user, BroadcastType.AllExceptUser, updateOthers);
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}
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else
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{
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var command = NewSyncplayCommand(SyncplayCommandType.Pause);
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SendCommand(user, BroadcastType.SingleUser, command);
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}
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}
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// TODO: client does not implement this yet
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else if (request.Type.Equals(SyncplayRequestType.BufferingComplete))
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{
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if (_group.IsPaused)
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{
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_group.SetBuffering(user, false);
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if (_group.IsBuffering()) {
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// Others are buffering, tell this client to pause when ready
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var when = request.When ??= DateTime.UtcNow;
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var currentTime = DateTime.UtcNow;
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var elapsedTime = currentTime - when;
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var clientPosition = TimeSpan.FromTicks(request.PositionTicks ??= 0) + elapsedTime;
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var delay = _group.PositionTicks - clientPosition.Ticks;
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var command = NewSyncplayCommand(SyncplayCommandType.Pause);
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command.When = currentTime.AddMilliseconds(
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delay
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).ToUniversalTime().ToString("o");
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SendCommand(user, BroadcastType.SingleUser, command);
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}
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else
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{
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// Let other clients resume as soon as the buffering client catches up
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var when = request.When ??= DateTime.UtcNow;
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var currentTime = DateTime.UtcNow;
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var elapsedTime = currentTime - when;
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var clientPosition = TimeSpan.FromTicks(request.PositionTicks ??= 0) + elapsedTime;
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var delay = _group.PositionTicks - clientPosition.Ticks;
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_group.IsPaused = false;
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if (delay > _group.GetHighestPing() * 2)
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{
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// Client that was buffering is recovering, notifying others to resume
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_group.LastActivity = currentTime.AddMilliseconds(
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delay
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);
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var command = NewSyncplayCommand(SyncplayCommandType.Play);
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SendCommand(user, BroadcastType.AllExceptUser, command);
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}
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else
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{
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// Client, that was buffering, resumed playback but did not update others in time
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delay = _group.GetHighestPing() * 2;
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delay = delay < _group.DefaulPing ? _group.DefaulPing : delay;
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_group.LastActivity = currentTime.AddMilliseconds(
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delay
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);
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var command = NewSyncplayCommand(SyncplayCommandType.Play);
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SendCommand(user, BroadcastType.AllGroup, command);
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}
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}
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}
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else
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{
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// Make sure client has latest group state
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var command = NewSyncplayCommand(SyncplayCommandType.Play);
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SendCommand(user, BroadcastType.SingleUser, command);
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}
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}
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else if (request.Type.Equals(SyncplayRequestType.KeepAlive))
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{
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_group.UpdatePing(user, request.Ping ??= _group.DefaulPing);
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var keepAlive = new SyncplayGroupUpdate<string>();
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keepAlive.GroupId = _group.GroupId.ToString();
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keepAlive.Type = SyncplayGroupUpdateType.KeepAlive;
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SendGroupUpdate(user, BroadcastType.SingleUser, keepAlive);
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}
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}
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/// <inheritdoc />
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public GroupInfoView GetInfo()
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{
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var info = new GroupInfoView();
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info.GroupId = GetGroupId().ToString();
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info.PlayingItemName = _group.PlayingItem.Name;
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info.PlayingItemId = _group.PlayingItem.Id.ToString();
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info.PositionTicks = _group.PositionTicks;
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info.Partecipants = _group.Partecipants.Values.Select(user => user.Session.UserName).ToArray();
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return info;
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}
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}
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}
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