mirror of
https://github.com/jellyfin/jellyfin.git
synced 2024-09-06 05:47:14 -04:00
546 lines
18 KiB
C#
546 lines
18 KiB
C#
#pragma warning disable CS1591
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Threading.Tasks;
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using MediaBrowser.Controller.Configuration;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Controller.Plugins;
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using MediaBrowser.Model.IO;
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using Emby.Server.Implementations.Library;
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using Microsoft.Extensions.Logging;
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namespace Emby.Server.Implementations.IO
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{
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public class LibraryMonitor : ILibraryMonitor
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{
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private readonly ILogger<LibraryMonitor> _logger;
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private readonly ILibraryManager _libraryManager;
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private readonly IServerConfigurationManager _configurationManager;
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private readonly IFileSystem _fileSystem;
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/// <summary>
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/// The file system watchers.
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/// </summary>
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private readonly ConcurrentDictionary<string, FileSystemWatcher> _fileSystemWatchers = new ConcurrentDictionary<string, FileSystemWatcher>(StringComparer.OrdinalIgnoreCase);
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/// <summary>
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/// The affected paths.
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/// </summary>
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private readonly List<FileRefresher> _activeRefreshers = new List<FileRefresher>();
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/// <summary>
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/// A dynamic list of paths that should be ignored. Added to during our own file system modifications.
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/// </summary>
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private readonly ConcurrentDictionary<string, string> _tempIgnoredPaths = new ConcurrentDictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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/// <summary>
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/// Add the path to our temporary ignore list. Use when writing to a path within our listening scope.
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/// </summary>
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/// <param name="path">The path.</param>
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private void TemporarilyIgnore(string path)
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{
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_tempIgnoredPaths[path] = path;
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}
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public void ReportFileSystemChangeBeginning(string path)
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{
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if (string.IsNullOrEmpty(path))
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{
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throw new ArgumentNullException(nameof(path));
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}
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TemporarilyIgnore(path);
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}
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public bool IsPathLocked(string path)
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{
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// This method is not used by the core but it used by auto-organize
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var lockedPaths = _tempIgnoredPaths.Keys.ToList();
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return lockedPaths.Any(i => _fileSystem.AreEqual(i, path) || _fileSystem.ContainsSubPath(i, path));
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}
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public async void ReportFileSystemChangeComplete(string path, bool refreshPath)
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{
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if (string.IsNullOrEmpty(path))
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{
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throw new ArgumentNullException(nameof(path));
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}
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// This is an arbitrary amount of time, but delay it because file system writes often trigger events long after the file was actually written to.
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// Seeing long delays in some situations, especially over the network, sometimes up to 45 seconds
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// But if we make this delay too high, we risk missing legitimate changes, such as user adding a new file, or hand-editing metadata
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await Task.Delay(45000).ConfigureAwait(false);
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_tempIgnoredPaths.TryRemove(path, out var val);
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if (refreshPath)
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{
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try
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{
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ReportFileSystemChanged(path);
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Error in ReportFileSystemChanged for {path}", path);
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}
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}
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="LibraryMonitor" /> class.
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/// </summary>
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public LibraryMonitor(
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ILogger<LibraryMonitor> logger,
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ILibraryManager libraryManager,
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IServerConfigurationManager configurationManager,
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IFileSystem fileSystem)
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{
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_libraryManager = libraryManager;
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_logger = logger;
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_configurationManager = configurationManager;
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_fileSystem = fileSystem;
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}
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private bool IsLibraryMonitorEnabled(BaseItem item)
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{
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if (item is BasePluginFolder)
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{
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return false;
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}
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var options = _libraryManager.GetLibraryOptions(item);
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if (options != null)
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{
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return options.EnableRealtimeMonitor;
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}
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return false;
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}
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public void Start()
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{
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_libraryManager.ItemAdded += OnLibraryManagerItemAdded;
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_libraryManager.ItemRemoved += OnLibraryManagerItemRemoved;
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var pathsToWatch = new List<string>();
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var paths = _libraryManager
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.RootFolder
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.Children
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.Where(IsLibraryMonitorEnabled)
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.OfType<Folder>()
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.SelectMany(f => f.PhysicalLocations)
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.Distinct(StringComparer.OrdinalIgnoreCase)
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.OrderBy(i => i)
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.ToList();
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foreach (var path in paths)
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{
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if (!ContainsParentFolder(pathsToWatch, path))
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{
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pathsToWatch.Add(path);
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}
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}
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foreach (var path in pathsToWatch)
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{
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StartWatchingPath(path);
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}
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}
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private void StartWatching(BaseItem item)
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{
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if (IsLibraryMonitorEnabled(item))
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{
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StartWatchingPath(item.Path);
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}
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}
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/// <summary>
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/// Handles the ItemRemoved event of the LibraryManager control.
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/// </summary>
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/// <param name="sender">The source of the event.</param>
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/// <param name="e">The <see cref="ItemChangeEventArgs"/> instance containing the event data.</param>
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private void OnLibraryManagerItemRemoved(object sender, ItemChangeEventArgs e)
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{
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if (e.Parent is AggregateFolder)
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{
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StopWatchingPath(e.Item.Path);
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}
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}
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/// <summary>
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/// Handles the ItemAdded event of the LibraryManager control.
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/// </summary>
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/// <param name="sender">The source of the event.</param>
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/// <param name="e">The <see cref="ItemChangeEventArgs"/> instance containing the event data.</param>
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private void OnLibraryManagerItemAdded(object sender, ItemChangeEventArgs e)
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{
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if (e.Parent is AggregateFolder)
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{
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StartWatching(e.Item);
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}
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}
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/// <summary>
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/// Examine a list of strings assumed to be file paths to see if it contains a parent of
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/// the provided path.
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/// </summary>
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/// <param name="lst">The LST.</param>
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/// <param name="path">The path.</param>
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/// <returns><c>true</c> if [contains parent folder] [the specified LST]; otherwise, <c>false</c>.</returns>
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/// <exception cref="ArgumentNullException">path</exception>
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private static bool ContainsParentFolder(IEnumerable<string> lst, string path)
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{
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if (string.IsNullOrEmpty(path))
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{
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throw new ArgumentNullException(nameof(path));
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}
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path = path.TrimEnd(Path.DirectorySeparatorChar);
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return lst.Any(str =>
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{
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// this should be a little quicker than examining each actual parent folder...
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var compare = str.TrimEnd(Path.DirectorySeparatorChar);
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return path.Equals(compare, StringComparison.OrdinalIgnoreCase) || (path.StartsWith(compare, StringComparison.OrdinalIgnoreCase) && path[compare.Length] == Path.DirectorySeparatorChar);
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});
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}
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/// <summary>
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/// Starts the watching path.
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/// </summary>
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/// <param name="path">The path.</param>
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private void StartWatchingPath(string path)
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{
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if (!Directory.Exists(path))
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{
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// Seeing a crash in the mono runtime due to an exception being thrown on a different thread
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_logger.LogInformation("Skipping realtime monitor for {Path} because the path does not exist", path);
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return;
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}
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// Already being watched
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if (_fileSystemWatchers.ContainsKey(path))
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{
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return;
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}
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// Creating a FileSystemWatcher over the LAN can take hundreds of milliseconds, so wrap it in a Task to do them all in parallel
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Task.Run(() =>
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{
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try
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{
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var newWatcher = new FileSystemWatcher(path, "*")
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{
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IncludeSubdirectories = true,
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InternalBufferSize = 65536,
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NotifyFilter = NotifyFilters.CreationTime |
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NotifyFilters.DirectoryName |
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NotifyFilters.FileName |
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NotifyFilters.LastWrite |
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NotifyFilters.Size |
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NotifyFilters.Attributes
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};
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newWatcher.Created += OnWatcherChanged;
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newWatcher.Deleted += OnWatcherChanged;
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newWatcher.Renamed += OnWatcherChanged;
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newWatcher.Changed += OnWatcherChanged;
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newWatcher.Error += OnWatcherError;
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if (_fileSystemWatchers.TryAdd(path, newWatcher))
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{
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newWatcher.EnableRaisingEvents = true;
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_logger.LogInformation("Watching directory " + path);
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}
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else
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{
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DisposeWatcher(newWatcher, false);
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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 watching path: {path}", path);
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}
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});
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}
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/// <summary>
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/// Stops the watching path.
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/// </summary>
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/// <param name="path">The path.</param>
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private void StopWatchingPath(string path)
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{
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if (_fileSystemWatchers.TryGetValue(path, out var watcher))
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{
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DisposeWatcher(watcher, true);
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}
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}
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/// <summary>
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/// Disposes the watcher.
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/// </summary>
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private void DisposeWatcher(FileSystemWatcher watcher, bool removeFromList)
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{
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try
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{
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using (watcher)
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{
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_logger.LogInformation("Stopping directory watching for path {Path}", watcher.Path);
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watcher.Created -= OnWatcherChanged;
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watcher.Deleted -= OnWatcherChanged;
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watcher.Renamed -= OnWatcherChanged;
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watcher.Changed -= OnWatcherChanged;
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watcher.Error -= OnWatcherError;
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watcher.EnableRaisingEvents = false;
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}
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}
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finally
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{
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if (removeFromList)
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{
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RemoveWatcherFromList(watcher);
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}
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}
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}
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/// <summary>
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/// Removes the watcher from list.
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/// </summary>
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/// <param name="watcher">The watcher.</param>
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private void RemoveWatcherFromList(FileSystemWatcher watcher)
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{
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_fileSystemWatchers.TryRemove(watcher.Path, out _);
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}
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/// <summary>
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/// Handles the Error event of the watcher control.
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/// </summary>
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/// <param name="sender">The source of the event.</param>
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/// <param name="e">The <see cref="ErrorEventArgs" /> instance containing the event data.</param>
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private void OnWatcherError(object sender, ErrorEventArgs e)
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{
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var ex = e.GetException();
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var dw = (FileSystemWatcher)sender;
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_logger.LogError(ex, "Error in Directory watcher for: {Path}", dw.Path);
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DisposeWatcher(dw, true);
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}
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/// <summary>
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/// Handles the Changed event of the watcher control.
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/// </summary>
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/// <param name="sender">The source of the event.</param>
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/// <param name="e">The <see cref="FileSystemEventArgs" /> instance containing the event data.</param>
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private void OnWatcherChanged(object sender, FileSystemEventArgs e)
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{
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try
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{
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ReportFileSystemChanged(e.FullPath);
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Exception in ReportFileSystemChanged. Path: {FullPath}", e.FullPath);
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}
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}
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public void ReportFileSystemChanged(string path)
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{
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if (string.IsNullOrEmpty(path))
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{
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throw new ArgumentNullException(nameof(path));
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}
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var monitorPath = !IgnorePatterns.ShouldIgnore(path);
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// Ignore certain files
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var tempIgnorePaths = _tempIgnoredPaths.Keys.ToList();
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// If the parent of an ignored path has a change event, ignore that too
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if (tempIgnorePaths.Any(i =>
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{
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if (_fileSystem.AreEqual(i, path))
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{
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_logger.LogDebug("Ignoring change to {Path}", path);
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return true;
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}
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if (_fileSystem.ContainsSubPath(i, path))
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{
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_logger.LogDebug("Ignoring change to {Path}", path);
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return true;
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}
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// Go up a level
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var parent = Path.GetDirectoryName(i);
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if (!string.IsNullOrEmpty(parent) && _fileSystem.AreEqual(parent, path))
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{
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_logger.LogDebug("Ignoring change to {Path}", path);
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return true;
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}
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return false;
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}))
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{
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monitorPath = false;
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}
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if (monitorPath)
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{
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// Avoid implicitly captured closure
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CreateRefresher(path);
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}
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}
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private void CreateRefresher(string path)
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{
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var parentPath = Path.GetDirectoryName(path);
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lock (_activeRefreshers)
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{
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foreach (var refresher in _activeRefreshers)
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{
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// Path is already being refreshed
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if (_fileSystem.AreEqual(path, refresher.Path))
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{
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refresher.RestartTimer();
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return;
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}
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// Parent folder is already being refreshed
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if (_fileSystem.ContainsSubPath(refresher.Path, path))
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{
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refresher.AddPath(path);
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return;
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}
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// New path is a parent
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if (_fileSystem.ContainsSubPath(path, refresher.Path))
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{
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refresher.ResetPath(path, null);
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return;
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}
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// They are siblings. Rebase the refresher to the parent folder.
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if (string.Equals(parentPath, Path.GetDirectoryName(refresher.Path), StringComparison.Ordinal))
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{
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refresher.ResetPath(parentPath, path);
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return;
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}
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}
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var newRefresher = new FileRefresher(path, _configurationManager, _libraryManager, _logger);
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newRefresher.Completed += NewRefresher_Completed;
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_activeRefreshers.Add(newRefresher);
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}
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}
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private void NewRefresher_Completed(object sender, EventArgs e)
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{
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var refresher = (FileRefresher)sender;
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DisposeRefresher(refresher);
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}
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/// <summary>
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/// Stops this instance.
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/// </summary>
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public void Stop()
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{
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_libraryManager.ItemAdded -= OnLibraryManagerItemAdded;
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_libraryManager.ItemRemoved -= OnLibraryManagerItemRemoved;
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foreach (var watcher in _fileSystemWatchers.Values.ToList())
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{
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DisposeWatcher(watcher, false);
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}
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_fileSystemWatchers.Clear();
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DisposeRefreshers();
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}
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private void DisposeRefresher(FileRefresher refresher)
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{
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lock (_activeRefreshers)
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{
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refresher.Dispose();
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_activeRefreshers.Remove(refresher);
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}
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}
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private void DisposeRefreshers()
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{
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lock (_activeRefreshers)
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{
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foreach (var refresher in _activeRefreshers.ToList())
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{
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refresher.Dispose();
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}
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_activeRefreshers.Clear();
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}
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}
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private bool _disposed = false;
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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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/// <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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if (disposing)
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{
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Stop();
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}
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_disposed = true;
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}
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}
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public class LibraryMonitorStartup : IServerEntryPoint
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{
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private readonly ILibraryMonitor _monitor;
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public LibraryMonitorStartup(ILibraryMonitor monitor)
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{
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_monitor = monitor;
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}
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public Task RunAsync()
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{
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_monitor.Start();
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return Task.CompletedTask;
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}
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public void Dispose()
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{
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}
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}
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}
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