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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Model.IO;
using Microsoft.Extensions.Logging;
using MediaBrowser.Model.Tasks;
namespace Emby.Server.Implementations.ScheduledTasks.Tasks
{
/// <summary>
/// Deletes old cache files
/// </summary>
public class DeleteCacheFileTask : IScheduledTask, IConfigurableScheduledTask
{
/// <summary>
/// Gets or sets the application paths.
/// </summary>
/// <value>The application paths.</value>
private IApplicationPaths ApplicationPaths { get; set; }
private readonly ILogger _logger;
private readonly IFileSystem _fileSystem;
/// <summary>
/// Initializes a new instance of the <see cref="DeleteCacheFileTask" /> class.
/// </summary>
public DeleteCacheFileTask(IApplicationPaths appPaths, ILogger logger, IFileSystem fileSystem)
{
ApplicationPaths = appPaths;
_logger = logger;
_fileSystem = fileSystem;
}
/// <summary>
/// Creates the triggers that define when the task will run
/// </summary>
/// <returns>IEnumerable{BaseTaskTrigger}.</returns>
public IEnumerable<TaskTriggerInfo> GetDefaultTriggers()
{
return new[] {
// Every so often
new TaskTriggerInfo { Type = TaskTriggerInfo.TriggerInterval, IntervalTicks = TimeSpan.FromHours(24).Ticks}
};
}
/// <summary>
/// Returns the task to be executed
/// </summary>
/// <param name="cancellationToken">The cancellation token.</param>
/// <param name="progress">The progress.</param>
/// <returns>Task.</returns>
public Task Execute(CancellationToken cancellationToken, IProgress<double> progress)
{
var minDateModified = DateTime.UtcNow.AddDays(-30);
try
{
DeleteCacheFilesFromDirectory(cancellationToken, ApplicationPaths.CachePath, minDateModified, progress);
}
catch (DirectoryNotFoundException)
{
// No biggie here. Nothing to delete
}
progress.Report(90);
minDateModified = DateTime.UtcNow.AddDays(-1);
try
{
DeleteCacheFilesFromDirectory(cancellationToken, ApplicationPaths.TempDirectory, minDateModified, progress);
}
catch (DirectoryNotFoundException)
{
// No biggie here. Nothing to delete
}
return Task.CompletedTask;
}
/// <summary>
/// Deletes the cache files from directory with a last write time less than a given date
/// </summary>
/// <param name="cancellationToken">The task cancellation token.</param>
/// <param name="directory">The directory.</param>
/// <param name="minDateModified">The min date modified.</param>
/// <param name="progress">The progress.</param>
private void DeleteCacheFilesFromDirectory(CancellationToken cancellationToken, string directory, DateTime minDateModified, IProgress<double> progress)
{
var filesToDelete = _fileSystem.GetFiles(directory, true)
.Where(f => _fileSystem.GetLastWriteTimeUtc(f) < minDateModified)
.ToList();
var index = 0;
foreach (var file in filesToDelete)
{
double percent = index;
percent /= filesToDelete.Count;
progress.Report(100 * percent);
cancellationToken.ThrowIfCancellationRequested();
DeleteFile(file.FullName);
index++;
}
DeleteEmptyFolders(directory);
progress.Report(100);
}
private void DeleteEmptyFolders(string parent)
{
foreach (var directory in _fileSystem.GetDirectoryPaths(parent))
{
DeleteEmptyFolders(directory);
if (!_fileSystem.GetFileSystemEntryPaths(directory).Any())
{
try
{
_fileSystem.DeleteDirectory(directory, false);
}
catch (UnauthorizedAccessException ex)
{
_logger.LogError("Error deleting directory {0}", ex, directory);
}
catch (IOException ex)
{
_logger.LogError("Error deleting directory {0}", ex, directory);
}
}
}
}
private void DeleteFile(string path)
{
try
{
_fileSystem.DeleteFile(path);
}
catch (UnauthorizedAccessException ex)
{
_logger.LogError("Error deleting file {0}", ex, path);
}
catch (IOException ex)
{
_logger.LogError("Error deleting file {0}", ex, path);
}
}
/// <summary>
/// Gets the name of the task
/// </summary>
/// <value>The name.</value>
public string Name
{
get { return "Cache file cleanup"; }
}
public string Key
{
get { return "DeleteCacheFiles"; }
}
/// <summary>
/// Gets the description.
/// </summary>
/// <value>The description.</value>
public string Description
{
get { return "Deletes cache files no longer needed by the system"; }
}
/// <summary>
/// Gets the category.
/// </summary>
/// <value>The category.</value>
public string Category
{
get
{
return "Maintenance";
}
}
/// <summary>
/// Gets a value indicating whether this instance is hidden.
/// </summary>
/// <value><c>true</c> if this instance is hidden; otherwise, <c>false</c>.</value>
public bool IsHidden
{
get { return true; }
}
public bool IsEnabled
{
get { return true; }
}
public bool IsLogged
{
get { return true; }
}
}
}
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