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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;
using MediaBrowser.Model.Extensions;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.System;
using MediaBrowser.Model.Tasks;
using Microsoft.Extensions.Logging;
namespace Emby.Server.Implementations.IO
{
public class FileRefresher : IDisposable
{
private ILogger Logger { get; set; }
private ILibraryManager LibraryManager { get; set; }
private IServerConfigurationManager ConfigurationManager { get; set; }
private readonly List<string> _affectedPaths = new List<string>();
private Timer _timer;
private readonly object _timerLock = new object();
public string Path { get; private set; }
public event EventHandler<EventArgs> Completed;
public FileRefresher(string path, IServerConfigurationManager configurationManager, ILibraryManager libraryManager, ILogger logger)
{
logger.LogDebug("New file refresher created for {0}", path);
Path = path;
ConfigurationManager = configurationManager;
LibraryManager = libraryManager;
Logger = logger;
AddPath(path);
}
private void AddAffectedPath(string path)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException(nameof(path));
}
if (!_affectedPaths.Contains(path, StringComparer.Ordinal))
{
_affectedPaths.Add(path);
}
}
public void AddPath(string path)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException(nameof(path));
}
lock (_timerLock)
{
AddAffectedPath(path);
}
RestartTimer();
}
public void RestartTimer()
{
if (_disposed)
{
return;
}
lock (_timerLock)
{
if (_disposed)
{
return;
}
if (_timer == null)
{
_timer = new Timer(OnTimerCallback, null, TimeSpan.FromSeconds(ConfigurationManager.Configuration.LibraryMonitorDelay), TimeSpan.FromMilliseconds(-1));
}
else
{
_timer.Change(TimeSpan.FromSeconds(ConfigurationManager.Configuration.LibraryMonitorDelay), TimeSpan.FromMilliseconds(-1));
}
}
}
public void ResetPath(string path, string affectedFile)
{
lock (_timerLock)
{
Logger.LogDebug("Resetting file refresher from {0} to {1}", Path, path);
Path = path;
AddAffectedPath(path);
if (!string.IsNullOrEmpty(affectedFile))
{
AddAffectedPath(affectedFile);
}
}
RestartTimer();
}
private void OnTimerCallback(object state)
{
List<string> paths;
lock (_timerLock)
{
paths = _affectedPaths.ToList();
}
Logger.LogDebug("Timer stopped.");
DisposeTimer();
Completed?.Invoke(this, EventArgs.Empty);
try
{
ProcessPathChanges(paths.ToList());
}
catch (Exception ex)
{
Logger.LogError(ex, "Error processing directory changes");
}
}
private void ProcessPathChanges(List<string> paths)
{
var itemsToRefresh = paths
.Distinct(StringComparer.OrdinalIgnoreCase)
.Select(GetAffectedBaseItem)
.Where(item => item != null)
.GroupBy(x => x.Id)
.Select(x => x.First());
foreach (var item in itemsToRefresh)
{
if (item is AggregateFolder)
{
continue;
}
Logger.LogInformation("{name} ({path}) will be refreshed.", item.Name, item.Path);
try
{
item.ChangedExternally();
}
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.LogError(ex, "Error refreshing {name}", item.Name);
}
catch (Exception ex)
{
Logger.LogError(ex, "Error refreshing {name}", 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.FindByPath(path, null);
path = System.IO.Path.GetDirectoryName(path);
}
if (item != null)
{
// If the item has been deleted find the first valid parent that still exists
while (!Directory.Exists(item.Path) && !File.Exists(item.Path))
{
item = item.GetOwner() ?? item.GetParent();
if (item == null)
{
break;
}
}
}
return item;
}
private void DisposeTimer()
{
lock (_timerLock)
{
if (_timer != null)
{
_timer.Dispose();
_timer = null;
}
}
}
private bool _disposed;
public void Dispose()
{
_disposed = true;
DisposeTimer();
}
}
}
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