644 lines
21 KiB
C#
644 lines
21 KiB
C#
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 MediaBrowser.Model.Logging;
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using MediaBrowser.Model.System;
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using MediaBrowser.Model.Tasks;
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using MediaBrowser.Model.Threading;
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using Emby.Server.Implementations.IO;
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namespace Emby.Server.Core.IO
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{
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public class LibraryMonitor : ILibraryMonitor
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{
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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 sytem 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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/// Any file name ending in any of these will be ignored by the watchers
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/// </summary>
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private readonly IReadOnlyList<string> _alwaysIgnoreFiles = new List<string>
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{
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"small.jpg",
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"albumart.jpg",
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// WMC temp recording directories that will constantly be written to
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"TempRec",
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"TempSBE"
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};
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private readonly IReadOnlyList<string> _alwaysIgnoreSubstrings = new List<string>
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{
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// Synology
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"eaDir",
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"#recycle",
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".wd_tv",
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".actors"
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};
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private readonly IReadOnlyList<string> _alwaysIgnoreExtensions = new List<string>
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{
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// thumbs.db
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".db",
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// bts sync files
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".bts",
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".sync"
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};
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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("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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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("path");
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}
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// This is an arbitraty 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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string val;
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_tempIgnoredPaths.TryRemove(path, out 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.ErrorException("Error in ReportFileSystemChanged for {0}", ex, path);
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}
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}
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}
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/// <summary>
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/// Gets or sets the logger.
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/// </summary>
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/// <value>The logger.</value>
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private ILogger Logger { get; set; }
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/// <summary>
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/// Gets or sets the task manager.
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/// </summary>
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/// <value>The task manager.</value>
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private ITaskManager TaskManager { get; set; }
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private ILibraryManager LibraryManager { get; set; }
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private IServerConfigurationManager ConfigurationManager { get; set; }
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private readonly IFileSystem _fileSystem;
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private readonly ITimerFactory _timerFactory;
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private readonly IEnvironmentInfo _environmentInfo;
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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(ILogManager logManager, ITaskManager taskManager, ILibraryManager libraryManager, IServerConfigurationManager configurationManager, IFileSystem fileSystem, ITimerFactory timerFactory, ISystemEvents systemEvents, IEnvironmentInfo environmentInfo)
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{
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if (taskManager == null)
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{
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throw new ArgumentNullException("taskManager");
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}
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LibraryManager = libraryManager;
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TaskManager = taskManager;
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Logger = logManager.GetLogger(GetType().Name);
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ConfigurationManager = configurationManager;
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_fileSystem = fileSystem;
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_timerFactory = timerFactory;
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_environmentInfo = environmentInfo;
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systemEvents.Resume += _systemEvents_Resume;
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}
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private void _systemEvents_Resume(object sender, EventArgs e)
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{
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Restart();
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}
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private void Restart()
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{
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Stop();
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Start();
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}
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private bool IsLibraryMonitorEnabaled(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 += LibraryManager_ItemAdded;
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LibraryManager.ItemRemoved += LibraryManager_ItemRemoved;
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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(IsLibraryMonitorEnabaled)
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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 (IsLibraryMonitorEnabaled(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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void LibraryManager_ItemRemoved(object sender, ItemChangeEventArgs e)
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{
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if (e.Item.GetParent() 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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void LibraryManager_ItemAdded(object sender, ItemChangeEventArgs e)
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{
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if (e.Item.GetParent() 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="System.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.IsNullOrWhiteSpace(path))
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{
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throw new ArgumentNullException("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 (!_fileSystem.DirectoryExists(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.Info("Skipping realtime monitor for {0} 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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};
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if (_environmentInfo.OperatingSystem == MediaBrowser.Model.System.OperatingSystem.Windows)
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{
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newWatcher.InternalBufferSize = 32767;
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}
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newWatcher.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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newWatcher.Created += watcher_Changed;
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newWatcher.Deleted += watcher_Changed;
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newWatcher.Renamed += watcher_Changed;
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newWatcher.Changed += watcher_Changed;
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newWatcher.Error += watcher_Error;
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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.Info("Watching directory " + path);
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}
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else
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{
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newWatcher.Dispose();
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}
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}
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catch (Exception ex)
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{
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Logger.ErrorException("Error watching path: {0}", ex, 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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FileSystemWatcher watcher;
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if (_fileSystemWatchers.TryGetValue(path, out watcher))
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{
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DisposeWatcher(watcher);
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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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/// <param name="watcher">The watcher.</param>
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private void DisposeWatcher(FileSystemWatcher watcher)
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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.Info("Stopping directory watching for path {0}", watcher.Path);
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watcher.EnableRaisingEvents = false;
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}
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}
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catch
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{
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}
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finally
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{
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RemoveWatcherFromList(watcher);
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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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FileSystemWatcher removed;
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_fileSystemWatchers.TryRemove(watcher.Path, out removed);
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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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void watcher_Error(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.ErrorException("Error in Directory watcher for: " + dw.Path, ex);
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DisposeWatcher(dw);
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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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void watcher_Changed(object sender, FileSystemEventArgs e)
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{
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try
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{
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Logger.Debug("Changed detected of type " + e.ChangeType + " to " + e.FullPath);
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var path = e.FullPath;
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// For deletes, use the parent path
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if (e.ChangeType == WatcherChangeTypes.Deleted)
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{
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var parentPath = Path.GetDirectoryName(path);
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if (!string.IsNullOrWhiteSpace(parentPath))
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{
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path = parentPath;
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}
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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.ErrorException("Exception in ReportFileSystemChanged. Path: {0}", ex, 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("path");
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}
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var filename = Path.GetFileName(path);
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var monitorPath = !string.IsNullOrEmpty(filename) &&
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!_alwaysIgnoreFiles.Contains(filename, StringComparer.OrdinalIgnoreCase) &&
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!_alwaysIgnoreExtensions.Contains(Path.GetExtension(path) ?? string.Empty, StringComparer.OrdinalIgnoreCase) &&
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_alwaysIgnoreSubstrings.All(i => path.IndexOf(i, StringComparison.OrdinalIgnoreCase) == -1);
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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 (string.Equals(i, path, StringComparison.OrdinalIgnoreCase))
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{
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Logger.Debug("Ignoring change to {0}", 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.Debug("Ignoring change to {0}", 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))
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{
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if (string.Equals(parent, path, StringComparison.OrdinalIgnoreCase))
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{
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Logger.Debug("Ignoring change to {0}", path);
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return true;
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}
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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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var refreshers = _activeRefreshers.ToList();
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foreach (var refresher in refreshers)
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{
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// Path is already being refreshed
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if (string.Equals(path, refresher.Path, StringComparison.Ordinal))
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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, _fileSystem, ConfigurationManager, LibraryManager, TaskManager, Logger, _timerFactory, _environmentInfo);
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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 -= LibraryManager_ItemAdded;
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LibraryManager.ItemRemoved -= LibraryManager_ItemRemoved;
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foreach (var watcher in _fileSystemWatchers.Values.ToList())
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{
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watcher.Created -= watcher_Changed;
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watcher.Deleted -= watcher_Changed;
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watcher.Renamed -= watcher_Changed;
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watcher.Changed -= watcher_Changed;
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try
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{
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watcher.EnableRaisingEvents = false;
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}
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catch (InvalidOperationException)
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{
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// Seeing this under mono on linux sometimes
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// Collection was modified; enumeration operation may not execute.
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}
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watcher.Dispose();
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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)
|
|
{
|
|
refresher.Dispose();
|
|
_activeRefreshers.Remove(refresher);
|
|
}
|
|
}
|
|
|
|
private void DisposeRefreshers()
|
|
{
|
|
lock (_activeRefreshers)
|
|
{
|
|
foreach (var refresher in _activeRefreshers.ToList())
|
|
{
|
|
refresher.Dispose();
|
|
}
|
|
_activeRefreshers.Clear();
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
|
|
/// </summary>
|
|
public void Dispose()
|
|
{
|
|
Dispose(true);
|
|
GC.SuppressFinalize(this);
|
|
}
|
|
|
|
/// <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)
|
|
{
|
|
Stop();
|
|
}
|
|
}
|
|
}
|
|
|
|
public class LibraryMonitorStartup : IServerEntryPoint
|
|
{
|
|
private readonly ILibraryMonitor _monitor;
|
|
|
|
public LibraryMonitorStartup(ILibraryMonitor monitor)
|
|
{
|
|
_monitor = monitor;
|
|
}
|
|
|
|
public void Run()
|
|
{
|
|
_monitor.Start();
|
|
}
|
|
|
|
public void Dispose()
|
|
{
|
|
}
|
|
}
|
|
}
|