jellyfin-server/MediaBrowser.Server.Implementations/EntryPoints/LibraryChangedNotifier.cs

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C#
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using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Plugins;
using MediaBrowser.Controller.Session;
using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.Logging;
using MoreLinq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
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namespace MediaBrowser.Server.Implementations.EntryPoints
{
public class LibraryChangedNotifier : IServerEntryPoint
{
/// <summary>
/// The _library manager
/// </summary>
private readonly ILibraryManager _libraryManager;
private readonly ISessionManager _sessionManager;
private readonly IUserManager _userManager;
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private readonly ILogger _logger;
/// <summary>
/// The _library changed sync lock
/// </summary>
private readonly object _libraryChangedSyncLock = new object();
private readonly List<Folder> _foldersAddedTo = new List<Folder>();
private readonly List<Folder> _foldersRemovedFrom = new List<Folder>();
private readonly List<BaseItem> _itemsAdded = new List<BaseItem>();
private readonly List<BaseItem> _itemsRemoved = new List<BaseItem>();
private readonly List<BaseItem> _itemsUpdated = new List<BaseItem>();
/// <summary>
/// Gets or sets the library update timer.
/// </summary>
/// <value>The library update timer.</value>
private Timer LibraryUpdateTimer { get; set; }
/// <summary>
/// The library update duration
/// </summary>
private const int LibraryUpdateDuration = 20000;
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public LibraryChangedNotifier(ILibraryManager libraryManager, ISessionManager sessionManager, IUserManager userManager, ILogger logger)
{
_libraryManager = libraryManager;
_sessionManager = sessionManager;
_userManager = userManager;
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_logger = logger;
}
public void Run()
{
_libraryManager.ItemAdded += libraryManager_ItemAdded;
_libraryManager.ItemUpdated += libraryManager_ItemUpdated;
_libraryManager.ItemRemoved += libraryManager_ItemRemoved;
}
/// <summary>
/// Handles the ItemAdded event of the libraryManager control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="ItemChangeEventArgs"/> instance containing the event data.</param>
void libraryManager_ItemAdded(object sender, ItemChangeEventArgs e)
{
lock (_libraryChangedSyncLock)
{
if (LibraryUpdateTimer == null)
{
LibraryUpdateTimer = new Timer(LibraryUpdateTimerCallback, null, LibraryUpdateDuration,
Timeout.Infinite);
}
else
{
LibraryUpdateTimer.Change(LibraryUpdateDuration, Timeout.Infinite);
}
if (e.Item.Parent != null)
{
_foldersAddedTo.Add(e.Item.Parent);
}
_itemsAdded.Add(e.Item);
}
}
/// <summary>
/// Handles the ItemUpdated event of the libraryManager control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="ItemChangeEventArgs"/> instance containing the event data.</param>
void libraryManager_ItemUpdated(object sender, ItemChangeEventArgs e)
{
lock (_libraryChangedSyncLock)
{
if (LibraryUpdateTimer == null)
{
LibraryUpdateTimer = new Timer(LibraryUpdateTimerCallback, null, LibraryUpdateDuration,
Timeout.Infinite);
}
else
{
LibraryUpdateTimer.Change(LibraryUpdateDuration, Timeout.Infinite);
}
_itemsUpdated.Add(e.Item);
}
}
/// <summary>
/// Handles the ItemRemoved event of the libraryManager control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="ItemChangeEventArgs"/> instance containing the event data.</param>
void libraryManager_ItemRemoved(object sender, ItemChangeEventArgs e)
{
lock (_libraryChangedSyncLock)
{
if (LibraryUpdateTimer == null)
{
LibraryUpdateTimer = new Timer(LibraryUpdateTimerCallback, null, LibraryUpdateDuration,
Timeout.Infinite);
}
else
{
LibraryUpdateTimer.Change(LibraryUpdateDuration, Timeout.Infinite);
}
if (e.Item.Parent != null)
{
_foldersRemovedFrom.Add(e.Item.Parent);
}
_itemsRemoved.Add(e.Item);
}
}
/// <summary>
/// Libraries the update timer callback.
/// </summary>
/// <param name="state">The state.</param>
private void LibraryUpdateTimerCallback(object state)
{
lock (_libraryChangedSyncLock)
{
// Remove dupes in case some were saved multiple times
var foldersAddedTo = _foldersAddedTo.DistinctBy(i => i.Id).ToList();
var foldersRemovedFrom = _foldersRemovedFrom.DistinctBy(i => i.Id).ToList();
var itemsUpdated = _itemsUpdated
.Where(i => !_itemsAdded.Contains(i))
.DistinctBy(i => i.Id)
.ToList();
SendChangeNotifications(_itemsAdded.ToList(), itemsUpdated, _itemsRemoved.ToList(), foldersAddedTo, foldersRemovedFrom, CancellationToken.None);
if (LibraryUpdateTimer != null)
{
LibraryUpdateTimer.Dispose();
LibraryUpdateTimer = null;
}
_itemsAdded.Clear();
_itemsRemoved.Clear();
_itemsUpdated.Clear();
_foldersAddedTo.Clear();
_foldersRemovedFrom.Clear();
}
}
/// <summary>
/// Sends the change notifications.
/// </summary>
/// <param name="itemsAdded">The items added.</param>
/// <param name="itemsUpdated">The items updated.</param>
/// <param name="itemsRemoved">The items removed.</param>
/// <param name="foldersAddedTo">The folders added to.</param>
/// <param name="foldersRemovedFrom">The folders removed from.</param>
/// <param name="cancellationToken">The cancellation token.</param>
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private async void SendChangeNotifications(List<BaseItem> itemsAdded, List<BaseItem> itemsUpdated, List<BaseItem> itemsRemoved, List<Folder> foldersAddedTo, List<Folder> foldersRemovedFrom, CancellationToken cancellationToken)
{
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foreach (var user in _userManager.Users.ToList())
{
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var id = user.Id;
var userSessions = _sessionManager.Sessions
.Where(u => u.UserId.HasValue && u.UserId.Value == id && u.SessionController != null && u.IsActive)
.ToList();
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if (userSessions.Count > 0)
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{
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var info = GetLibraryUpdateInfo(itemsAdded, itemsUpdated, itemsRemoved, foldersAddedTo,
foldersRemovedFrom, id);
foreach (var userSession in userSessions)
{
try
{
await userSession.SessionController.SendLibraryUpdateInfo(info, cancellationToken).ConfigureAwait(false);
}
catch (Exception ex)
{
_logger.ErrorException("Error sending LibraryChanged message", ex);
}
}
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}
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}
}
/// <summary>
/// Gets the library update info.
/// </summary>
/// <param name="itemsAdded">The items added.</param>
/// <param name="itemsUpdated">The items updated.</param>
/// <param name="itemsRemoved">The items removed.</param>
/// <param name="foldersAddedTo">The folders added to.</param>
/// <param name="foldersRemovedFrom">The folders removed from.</param>
/// <param name="userId">The user id.</param>
/// <returns>LibraryUpdateInfo.</returns>
private LibraryUpdateInfo GetLibraryUpdateInfo(IEnumerable<BaseItem> itemsAdded, IEnumerable<BaseItem> itemsUpdated, IEnumerable<BaseItem> itemsRemoved, IEnumerable<Folder> foldersAddedTo, IEnumerable<Folder> foldersRemovedFrom, Guid userId)
{
var user = _userManager.GetUserById(userId);
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var collections = user.RootFolder.GetChildren(user, true).ToList();
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var allRecursiveChildren = user.RootFolder.GetRecursiveChildren(user)
.Select(i => i.Id)
.Distinct()
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.ToDictionary(i => i);
return new LibraryUpdateInfo
{
ItemsAdded = itemsAdded.SelectMany(i => TranslatePhysicalItemToUserLibrary(i, user, collections, allRecursiveChildren)).Select(i => i.Id).Distinct().ToList(),
ItemsUpdated = itemsUpdated.SelectMany(i => TranslatePhysicalItemToUserLibrary(i, user, collections, allRecursiveChildren)).Select(i => i.Id).Distinct().ToList(),
ItemsRemoved = itemsRemoved.SelectMany(i => TranslatePhysicalItemToUserLibrary(i, user, collections, allRecursiveChildren, true)).Select(i => i.Id).Distinct().ToList(),
FoldersAddedTo = foldersAddedTo.SelectMany(i => TranslatePhysicalItemToUserLibrary(i, user, collections, allRecursiveChildren)).Select(i => i.Id).Distinct().ToList(),
FoldersRemovedFrom = foldersRemovedFrom.SelectMany(i => TranslatePhysicalItemToUserLibrary(i, user, collections, allRecursiveChildren)).Select(i => i.Id).Distinct().ToList()
};
}
/// <summary>
/// Translates the physical item to user library.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="item">The item.</param>
/// <param name="user">The user.</param>
/// <param name="collections">The collections.</param>
/// <param name="allRecursiveChildren">All recursive children.</param>
/// <param name="includeIfNotFound">if set to <c>true</c> [include if not found].</param>
/// <returns>IEnumerable{``0}.</returns>
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private IEnumerable<T> TranslatePhysicalItemToUserLibrary<T>(T item, User user, IEnumerable<BaseItem> collections, Dictionary<Guid, Guid> allRecursiveChildren, bool includeIfNotFound = false)
where T : BaseItem
{
// If the physical root changed, return the user root
if (item is AggregateFolder)
{
return new[] { user.RootFolder as T };
}
// Need to find what user collection folder this belongs to
if (item.Parent is AggregateFolder)
{
if (item.LocationType == LocationType.FileSystem)
{
return collections.Where(i =>
{
try
{
return i.LocationType == LocationType.FileSystem &&
i.ResolveArgs.PhysicalLocations.Contains(item.Path);
}
catch (Exception ex)
{
_logger.ErrorException("Error getting ResolveArgs for {0}", ex, i.Path);
return false;
}
}).Cast<T>();
}
}
// If it's a user root, return it only if it's the right one
if (item is UserRootFolder)
{
if (item.Id == user.RootFolder.Id)
{
return new T[] { item };
}
return new T[] { };
}
// Return it only if it's in the user's library
if (includeIfNotFound || allRecursiveChildren.ContainsKey(item.Id))
{
return new[] { item };
}
return new T[] { };
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
Dispose(true);
}
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected virtual void Dispose(bool dispose)
{
if (dispose)
{
if (LibraryUpdateTimer != null)
{
LibraryUpdateTimer.Dispose();
LibraryUpdateTimer = null;
}
_libraryManager.ItemAdded -= libraryManager_ItemAdded;
_libraryManager.ItemUpdated -= libraryManager_ItemUpdated;
_libraryManager.ItemRemoved -= libraryManager_ItemRemoved;
}
}
}
}