728 lines
24 KiB
C#
728 lines
24 KiB
C#
using MediaBrowser.Common.IO;
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using MediaBrowser.Common.ScheduledTasks;
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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.Configuration;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Server.Implementations.ScheduledTasks;
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using Microsoft.Win32;
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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;
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using System.Threading.Tasks;
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using CommonIO;
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using MediaBrowser.Controller;
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namespace MediaBrowser.Server.Implementations.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 update timer
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/// </summary>
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private Timer _updateTimer;
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/// <summary>
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/// The affected paths
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/// </summary>
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private readonly ConcurrentDictionary<string, string> _affectedPaths = new ConcurrentDictionary<string, string>();
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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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"thumbs.db",
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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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/// <summary>
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/// The timer lock
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/// </summary>
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private readonly object _timerLock = new object();
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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 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(20000).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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ReportFileSystemChanged(path);
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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 IServerApplicationHost _appHost;
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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, IServerApplicationHost appHost)
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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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_appHost = appHost;
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SystemEvents.PowerModeChanged += SystemEvents_PowerModeChanged;
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}
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/// <summary>
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/// Handles the PowerModeChanged event of the SystemEvents 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="PowerModeChangedEventArgs"/> instance containing the event data.</param>
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void SystemEvents_PowerModeChanged(object sender, PowerModeChangedEventArgs 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 EnableLibraryMonitor
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{
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get
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{
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switch (ConfigurationManager.Configuration.EnableLibraryMonitor)
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{
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case AutoOnOff.Auto:
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return _appHost.SupportsLibraryMonitor;
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case AutoOnOff.Enabled:
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return true;
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default:
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return false;
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}
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}
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}
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public void Start()
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{
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if (EnableLibraryMonitor)
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{
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StartInternal();
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}
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}
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/// <summary>
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/// Starts this instance.
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/// </summary>
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private void StartInternal()
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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> { LibraryManager.RootFolder.Path };
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var paths = LibraryManager
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.RootFolder
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.Children
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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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/// <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.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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void LibraryManager_ItemAdded(object sender, ItemChangeEventArgs e)
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{
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if (e.Item.Parent is AggregateFolder)
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{
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StartWatchingPath(e.Item.Path);
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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.IsNullOrEmpty(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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// 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 = 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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Logger.Info("Unable to add directory watcher for {0}. It already exists in the dictionary.", path);
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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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if (ConfigurationManager.Configuration.EnableLibraryMonitor == AutoOnOff.Auto)
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{
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Logger.Info("Disabling realtime monitor to prevent future instability");
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ConfigurationManager.Configuration.EnableLibraryMonitor = AutoOnOff.Disabled;
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Stop();
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}
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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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ReportFileSystemChanged(e.FullPath);
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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) && _alwaysIgnoreFiles.Contains(filename, StringComparer.OrdinalIgnoreCase));
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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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var affectedPath = path;
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_affectedPaths.AddOrUpdate(path, path, (key, oldValue) => affectedPath);
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}
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RestartTimer();
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}
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private void RestartTimer()
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{
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lock (_timerLock)
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{
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if (_updateTimer == null)
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{
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_updateTimer = new Timer(TimerStopped, null, TimeSpan.FromSeconds(ConfigurationManager.Configuration.RealtimeLibraryMonitorDelay), TimeSpan.FromMilliseconds(-1));
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}
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else
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{
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_updateTimer.Change(TimeSpan.FromSeconds(ConfigurationManager.Configuration.RealtimeLibraryMonitorDelay), TimeSpan.FromMilliseconds(-1));
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}
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}
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}
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/// <summary>
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/// Timers the stopped.
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/// </summary>
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/// <param name="stateInfo">The state info.</param>
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private async void TimerStopped(object stateInfo)
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{
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// Extend the timer as long as any of the paths are still being written to.
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if (_affectedPaths.Any(p => IsFileLocked(p.Key)))
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{
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Logger.Info("Timer extended.");
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RestartTimer();
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return;
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}
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Logger.Debug("Timer stopped.");
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DisposeTimer();
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var paths = _affectedPaths.Keys.ToList();
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_affectedPaths.Clear();
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try
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{
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await ProcessPathChanges(paths).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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Logger.ErrorException("Error processing directory changes", ex);
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}
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}
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private bool IsFileLocked(string path)
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{
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try
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{
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var data = _fileSystem.GetFileSystemInfo(path);
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if (!data.Exists
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|| data.Attributes.HasFlag(FileAttributes.Directory)
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// Opening a writable stream will fail with readonly files
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|| data.Attributes.HasFlag(FileAttributes.ReadOnly))
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{
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return false;
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}
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}
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catch (IOException)
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{
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return false;
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}
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catch (Exception ex)
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{
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Logger.ErrorException("Error getting file system info for: {0}", ex, path);
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return false;
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}
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try
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{
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using (_fileSystem.GetFileStream(path, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))
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{
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if (_updateTimer != null)
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{
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//file is not locked
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return false;
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}
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}
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}
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catch (DirectoryNotFoundException)
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{
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// File may have been deleted
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return false;
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}
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catch (FileNotFoundException)
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{
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// File may have been deleted
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return false;
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}
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catch (IOException)
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{
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//the file is unavailable because it is:
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//still being written to
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//or being processed by another thread
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//or does not exist (has already been processed)
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Logger.Debug("{0} is locked.", path);
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return true;
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}
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catch (Exception ex)
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{
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Logger.ErrorException("Error determining if file is locked: {0}", ex, path);
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return false;
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}
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return false;
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}
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private void DisposeTimer()
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{
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lock (_timerLock)
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{
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if (_updateTimer != null)
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{
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_updateTimer.Dispose();
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_updateTimer = null;
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}
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}
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}
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/// <summary>
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/// Processes the path changes.
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/// </summary>
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/// <param name="paths">The paths.</param>
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/// <returns>Task.</returns>
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private async Task ProcessPathChanges(List<string> paths)
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{
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var itemsToRefresh = paths
|
|
.Select(GetAffectedBaseItem)
|
|
.Where(item => item != null)
|
|
.Distinct()
|
|
.ToList();
|
|
|
|
foreach (var p in paths)
|
|
{
|
|
Logger.Info(p + " reports change.");
|
|
}
|
|
|
|
// If the root folder changed, run the library task so the user can see it
|
|
if (itemsToRefresh.Any(i => i is AggregateFolder))
|
|
{
|
|
TaskManager.CancelIfRunningAndQueue<RefreshMediaLibraryTask>();
|
|
return;
|
|
}
|
|
|
|
foreach (var item in itemsToRefresh)
|
|
{
|
|
Logger.Info(item.Name + " (" + item.Path + ") will be refreshed.");
|
|
|
|
try
|
|
{
|
|
await item.ChangedExternally().ConfigureAwait(false);
|
|
}
|
|
catch (IOException ex)
|
|
{
|
|
// For now swallow and log.
|
|
// Research item: If an IOException occurs, the item may be in a disconnected state (media unavailable)
|
|
// Should we remove it from it's parent?
|
|
Logger.ErrorException("Error refreshing {0}", ex, item.Name);
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
Logger.ErrorException("Error refreshing {0}", ex, item.Name);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the affected base item.
|
|
/// </summary>
|
|
/// <param name="path">The path.</param>
|
|
/// <returns>BaseItem.</returns>
|
|
private BaseItem GetAffectedBaseItem(string path)
|
|
{
|
|
BaseItem item = null;
|
|
|
|
while (item == null && !string.IsNullOrEmpty(path))
|
|
{
|
|
item = LibraryManager.RootFolder.FindByPath(path);
|
|
|
|
path = Path.GetDirectoryName(path);
|
|
}
|
|
|
|
if (item != null)
|
|
{
|
|
// If the item has been deleted find the first valid parent that still exists
|
|
while (!_fileSystem.DirectoryExists(item.Path) && !_fileSystem.FileExists(item.Path))
|
|
{
|
|
item = item.Parent;
|
|
|
|
if (item == null)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return item;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Stops this instance.
|
|
/// </summary>
|
|
public void Stop()
|
|
{
|
|
LibraryManager.ItemAdded -= LibraryManager_ItemAdded;
|
|
LibraryManager.ItemRemoved -= LibraryManager_ItemRemoved;
|
|
|
|
foreach (var watcher in _fileSystemWatchers.Values.ToList())
|
|
{
|
|
watcher.Changed -= watcher_Changed;
|
|
watcher.EnableRaisingEvents = false;
|
|
watcher.Dispose();
|
|
}
|
|
|
|
DisposeTimer();
|
|
|
|
_fileSystemWatchers.Clear();
|
|
_affectedPaths.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()
|
|
{
|
|
}
|
|
}
|
|
}
|