| | | 1 | | using System; |
| | | 2 | | using System.Collections.Generic; |
| | | 3 | | using System.Linq; |
| | | 4 | | using System.Threading; |
| | | 5 | | using System.Threading.Tasks; |
| | | 6 | | using MediaBrowser.Controller.Entities; |
| | | 7 | | using MediaBrowser.Controller.Library; |
| | | 8 | | using MediaBrowser.Controller.Session; |
| | | 9 | | using MediaBrowser.Model.Entities; |
| | | 10 | | using MediaBrowser.Model.Session; |
| | | 11 | | using Microsoft.Extensions.Hosting; |
| | | 12 | | |
| | | 13 | | namespace Emby.Server.Implementations.EntryPoints |
| | | 14 | | { |
| | | 15 | | /// <summary> |
| | | 16 | | /// <see cref="IHostedService"/> responsible for notifying users when associated item data is updated. |
| | | 17 | | /// </summary> |
| | | 18 | | public sealed class UserDataChangeNotifier : IHostedService, IDisposable |
| | | 19 | | { |
| | | 20 | | private const int UpdateDuration = 500; |
| | | 21 | | internal const int MaxBatchSize = 2000; |
| | | 22 | | |
| | | 23 | | private readonly ISessionManager _sessionManager; |
| | | 24 | | private readonly IUserDataManager _userDataManager; |
| | | 25 | | private readonly IUserManager _userManager; |
| | | 26 | | |
| | 28 | 27 | | private readonly Dictionary<Guid, Dictionary<Guid, BaseItem>> _changedItems = []; |
| | 28 | 28 | | private readonly Lock _syncLock = new(); |
| | | 29 | | |
| | | 30 | | private Timer? _updateTimer; |
| | | 31 | | private int _changedItemCount; |
| | | 32 | | |
| | | 33 | | /// <summary> |
| | | 34 | | /// Initializes a new instance of the <see cref="UserDataChangeNotifier"/> class. |
| | | 35 | | /// </summary> |
| | | 36 | | /// <param name="userDataManager">The <see cref="IUserDataManager"/>.</param> |
| | | 37 | | /// <param name="sessionManager">The <see cref="ISessionManager"/>.</param> |
| | | 38 | | /// <param name="userManager">The <see cref="IUserManager"/>.</param> |
| | | 39 | | public UserDataChangeNotifier( |
| | | 40 | | IUserDataManager userDataManager, |
| | | 41 | | ISessionManager sessionManager, |
| | | 42 | | IUserManager userManager) |
| | | 43 | | { |
| | 28 | 44 | | _userDataManager = userDataManager; |
| | 28 | 45 | | _sessionManager = sessionManager; |
| | 28 | 46 | | _userManager = userManager; |
| | 28 | 47 | | } |
| | | 48 | | |
| | | 49 | | /// <inheritdoc /> |
| | | 50 | | public Task StartAsync(CancellationToken cancellationToken) |
| | | 51 | | { |
| | 28 | 52 | | _userDataManager.UserDataSaved += OnUserDataManagerUserDataSaved; |
| | | 53 | | |
| | 28 | 54 | | return Task.CompletedTask; |
| | | 55 | | } |
| | | 56 | | |
| | | 57 | | /// <inheritdoc /> |
| | | 58 | | public Task StopAsync(CancellationToken cancellationToken) |
| | | 59 | | { |
| | 28 | 60 | | _userDataManager.UserDataSaved -= OnUserDataManagerUserDataSaved; |
| | | 61 | | |
| | 28 | 62 | | return Task.CompletedTask; |
| | | 63 | | } |
| | | 64 | | |
| | | 65 | | private void OnUserDataManagerUserDataSaved(object? sender, UserDataSaveEventArgs e) |
| | | 66 | | { |
| | 18 | 67 | | if (e.SaveReason == UserDataSaveReason.PlaybackProgress) |
| | | 68 | | { |
| | 0 | 69 | | return; |
| | | 70 | | } |
| | | 71 | | |
| | | 72 | | lock (_syncLock) |
| | | 73 | | { |
| | | 74 | | // The window runs from the first change of a batch and is never extended, so a stream |
| | | 75 | | // of changes that never pauses - a library scan - still closes its batches instead of |
| | | 76 | | // holding every item it touched alive until the stream stops. |
| | 18 | 77 | | _updateTimer ??= new Timer( |
| | 18 | 78 | | UpdateTimerCallback, |
| | 18 | 79 | | null, |
| | 18 | 80 | | UpdateDuration, |
| | 18 | 81 | | Timeout.Infinite); |
| | | 82 | | |
| | 18 | 83 | | if (!_changedItems.TryGetValue(e.UserId, out Dictionary<Guid, BaseItem>? keys)) |
| | | 84 | | { |
| | 1 | 85 | | keys = []; |
| | 1 | 86 | | _changedItems[e.UserId] = keys; |
| | | 87 | | } |
| | | 88 | | |
| | 18 | 89 | | var baseItem = e.Item; |
| | | 90 | | |
| | | 91 | | // Go up one level for indicators |
| | 18 | 92 | | if (baseItem is not null) |
| | | 93 | | { |
| | 18 | 94 | | Track(keys, baseItem); |
| | | 95 | | |
| | 18 | 96 | | var parent = baseItem.GetOwner() ?? baseItem.GetParent(); |
| | | 97 | | |
| | 18 | 98 | | if (parent is not null) |
| | | 99 | | { |
| | 0 | 100 | | Track(keys, parent); |
| | | 101 | | } |
| | | 102 | | } |
| | | 103 | | |
| | | 104 | | // A window long enough to cover a burst still has to give way once the batch is |
| | | 105 | | // large enough to be worth sending on its own. |
| | 18 | 106 | | if (_changedItemCount >= MaxBatchSize) |
| | | 107 | | { |
| | 0 | 108 | | _updateTimer.Change(0, Timeout.Infinite); |
| | | 109 | | } |
| | 18 | 110 | | } |
| | 18 | 111 | | } |
| | | 112 | | |
| | | 113 | | private void Track(Dictionary<Guid, BaseItem> keys, BaseItem item) |
| | | 114 | | { |
| | 18 | 115 | | var before = keys.Count; |
| | 18 | 116 | | keys[item.Id] = item; |
| | | 117 | | |
| | 18 | 118 | | if (keys.Count != before) |
| | | 119 | | { |
| | 18 | 120 | | _changedItemCount++; |
| | | 121 | | } |
| | 18 | 122 | | } |
| | | 123 | | |
| | | 124 | | private async void UpdateTimerCallback(object? state) |
| | 1 | 125 | | { |
| | | 126 | | List<KeyValuePair<Guid, Dictionary<Guid, BaseItem>>> changes; |
| | | 127 | | lock (_syncLock) |
| | | 128 | | { |
| | 1 | 129 | | changes = _changedItems.ToList(); |
| | 1 | 130 | | _changedItems.Clear(); |
| | 1 | 131 | | _changedItemCount = 0; |
| | | 132 | | |
| | 1 | 133 | | if (_updateTimer is not null) |
| | | 134 | | { |
| | 1 | 135 | | _updateTimer.Dispose(); |
| | 1 | 136 | | _updateTimer = null; |
| | | 137 | | } |
| | 1 | 138 | | } |
| | | 139 | | |
| | 1 | 140 | | if (changes.Count == 0) |
| | | 141 | | { |
| | 0 | 142 | | return; |
| | | 143 | | } |
| | | 144 | | |
| | 4 | 145 | | foreach (var (userId, changedItems) in changes) |
| | | 146 | | { |
| | 1 | 147 | | await _sessionManager.SendMessageToUserSessions( |
| | 1 | 148 | | [userId], |
| | 1 | 149 | | SessionMessageType.UserDataChanged, |
| | 1 | 150 | | () => GetUserDataChangeInfo(userId, changedItems.Values), |
| | 1 | 151 | | default).ConfigureAwait(false); |
| | | 152 | | } |
| | 1 | 153 | | } |
| | | 154 | | |
| | | 155 | | private UserDataChangeInfo GetUserDataChangeInfo(Guid userId, IEnumerable<BaseItem> changedItems) |
| | | 156 | | { |
| | 0 | 157 | | var user = _userManager.GetUserById(userId) |
| | 0 | 158 | | ?? throw new ArgumentException("Invalid user ID", nameof(userId)); |
| | | 159 | | |
| | 0 | 160 | | return new UserDataChangeInfo |
| | 0 | 161 | | { |
| | 0 | 162 | | UserId = userId, |
| | 0 | 163 | | UserDataList = changedItems |
| | 0 | 164 | | .Select(i => |
| | 0 | 165 | | { |
| | 0 | 166 | | var dto = _userDataManager.GetUserDataDto(i, user); |
| | 0 | 167 | | if (dto is null) |
| | 0 | 168 | | { |
| | 0 | 169 | | return null!; |
| | 0 | 170 | | } |
| | 0 | 171 | | |
| | 0 | 172 | | dto.ItemId = i.Id; |
| | 0 | 173 | | return dto; |
| | 0 | 174 | | }) |
| | 0 | 175 | | .Where(e => e is not null) |
| | 0 | 176 | | .ToArray() |
| | 0 | 177 | | }; |
| | | 178 | | } |
| | | 179 | | |
| | | 180 | | /// <inheritdoc /> |
| | | 181 | | public void Dispose() |
| | | 182 | | { |
| | 28 | 183 | | _updateTimer?.Dispose(); |
| | 28 | 184 | | _updateTimer = null; |
| | 28 | 185 | | } |
| | | 186 | | } |
| | | 187 | | } |