jellyfin/MediaBrowser.Controller/Providers/ProviderManager.cs
2013-02-20 20:33:05 -05:00

333 lines
13 KiB
C#

using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.IO;
using MediaBrowser.Common.Kernel;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Persistence;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Controller.Providers
{
/// <summary>
/// Class ProviderManager
/// </summary>
public class ProviderManager : BaseManager<Kernel>
{
/// <summary>
/// The remote image cache
/// </summary>
private readonly FileSystemRepository _remoteImageCache;
/// <summary>
/// The currently running metadata providers
/// </summary>
private readonly ConcurrentDictionary<string, Tuple<BaseMetadataProvider, BaseItem, CancellationTokenSource>> _currentlyRunningProviders =
new ConcurrentDictionary<string, Tuple<BaseMetadataProvider, BaseItem, CancellationTokenSource>>();
/// <summary>
/// Initializes a new instance of the <see cref="ProviderManager" /> class.
/// </summary>
/// <param name="kernel">The kernel.</param>
public ProviderManager(Kernel kernel)
: base(kernel)
{
_remoteImageCache = new FileSystemRepository(ImagesDataPath);
}
/// <summary>
/// The _images data path
/// </summary>
private string _imagesDataPath;
/// <summary>
/// Gets the images data path.
/// </summary>
/// <value>The images data path.</value>
public string ImagesDataPath
{
get
{
if (_imagesDataPath == null)
{
_imagesDataPath = Path.Combine(Kernel.ApplicationPaths.DataPath, "remote-images");
if (!Directory.Exists(_imagesDataPath))
{
Directory.CreateDirectory(_imagesDataPath);
}
}
return _imagesDataPath;
}
}
/// <summary>
/// Gets or sets the supported providers key.
/// </summary>
/// <value>The supported providers key.</value>
private Guid SupportedProvidersKey { get; set; }
/// <summary>
/// Runs all metadata providers for an entity, and returns true or false indicating if at least one was refreshed and requires persistence
/// </summary>
/// <param name="item">The item.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <param name="force">if set to <c>true</c> [force].</param>
/// <param name="allowSlowProviders">if set to <c>true</c> [allow slow providers].</param>
/// <returns>Task{System.Boolean}.</returns>
internal async Task<bool> ExecuteMetadataProviders(BaseItem item, CancellationToken cancellationToken, bool force = false, bool allowSlowProviders = true)
{
// Allow providers of the same priority to execute in parallel
MetadataProviderPriority? currentPriority = null;
var currentTasks = new List<Task<bool>>();
var result = false;
cancellationToken.ThrowIfCancellationRequested();
// Determine if supported providers have changed
var supportedProviders = Kernel.MetadataProviders.Where(p => p.Supports(item)).ToList();
BaseProviderInfo supportedProvidersInfo;
if (SupportedProvidersKey == Guid.Empty)
{
SupportedProvidersKey = "SupportedProviders".GetMD5();
}
var supportedProvidersHash = string.Join("+", supportedProviders.Select(i => i.GetType().Name)).GetMD5();
bool providersChanged;
item.ProviderData.TryGetValue(SupportedProvidersKey, out supportedProvidersInfo);
if (supportedProvidersInfo == null)
{
// First time
supportedProvidersInfo = new BaseProviderInfo { ProviderId = SupportedProvidersKey, FileSystemStamp = supportedProvidersHash };
providersChanged = force = true;
}
else
{
// Force refresh if the supported providers have changed
providersChanged = force = force || supportedProvidersInfo.FileSystemStamp != supportedProvidersHash;
}
// If providers have changed, clear provider info and update the supported providers hash
if (providersChanged)
{
Logger.Debug("Providers changed for {0}. Clearing and forcing refresh.", item.Name);
item.ProviderData.Clear();
supportedProvidersInfo.FileSystemStamp = supportedProvidersHash;
}
if (force) item.ClearMetaValues();
// Run the normal providers sequentially in order of priority
foreach (var provider in supportedProviders)
{
cancellationToken.ThrowIfCancellationRequested();
// Skip if internet providers are currently disabled
if (provider.RequiresInternet && !Kernel.Configuration.EnableInternetProviders)
{
continue;
}
// Skip if is slow and we aren't allowing slow ones
if (provider.IsSlow && !allowSlowProviders)
{
continue;
}
// Skip if internet provider and this type is not allowed
if (provider.RequiresInternet && Kernel.Configuration.EnableInternetProviders && Kernel.Configuration.InternetProviderExcludeTypes.Contains(item.GetType().Name, StringComparer.OrdinalIgnoreCase))
{
continue;
}
// When a new priority is reached, await the ones that are currently running and clear the list
if (currentPriority.HasValue && currentPriority.Value != provider.Priority && currentTasks.Count > 0)
{
var results = await Task.WhenAll(currentTasks).ConfigureAwait(false);
result |= results.Contains(true);
currentTasks.Clear();
}
// Put this check below the await because the needs refresh of the next tier of providers may depend on the previous ones running
// This is the case for the fan art provider which depends on the movie and tv providers having run before them
if (!force && !provider.NeedsRefresh(item))
{
continue;
}
currentTasks.Add(provider.FetchAsync(item, force, cancellationToken));
currentPriority = provider.Priority;
}
if (currentTasks.Count > 0)
{
var results = await Task.WhenAll(currentTasks).ConfigureAwait(false);
result |= results.Contains(true);
}
if (providersChanged)
{
item.ProviderData[SupportedProvidersKey] = supportedProvidersInfo;
}
return result || providersChanged;
}
/// <summary>
/// Notifies the kernal that a provider has begun refreshing
/// </summary>
/// <param name="provider">The provider.</param>
/// <param name="item">The item.</param>
/// <param name="cancellationTokenSource">The cancellation token source.</param>
internal void OnProviderRefreshBeginning(BaseMetadataProvider provider, BaseItem item, CancellationTokenSource cancellationTokenSource)
{
var key = item.Id + provider.GetType().Name;
Tuple<BaseMetadataProvider, BaseItem, CancellationTokenSource> current;
if (_currentlyRunningProviders.TryGetValue(key, out current))
{
try
{
current.Item3.Cancel();
}
catch (ObjectDisposedException)
{
}
}
var tuple = new Tuple<BaseMetadataProvider, BaseItem, CancellationTokenSource>(provider, item, cancellationTokenSource);
_currentlyRunningProviders.AddOrUpdate(key, tuple, (k, v) => tuple);
}
/// <summary>
/// Notifies the kernal that a provider has completed refreshing
/// </summary>
/// <param name="provider">The provider.</param>
/// <param name="item">The item.</param>
internal void OnProviderRefreshCompleted(BaseMetadataProvider provider, BaseItem item)
{
var key = item.Id + provider.GetType().Name;
Tuple<BaseMetadataProvider, BaseItem, CancellationTokenSource> current;
if (_currentlyRunningProviders.TryRemove(key, out current))
{
current.Item3.Dispose();
}
}
/// <summary>
/// Validates the currently running providers and cancels any that should not be run due to configuration changes
/// </summary>
internal void ValidateCurrentlyRunningProviders()
{
Logger.Info("Validing currently running providers");
var enableInternetProviders = Kernel.Configuration.EnableInternetProviders;
var internetProviderExcludeTypes = Kernel.Configuration.InternetProviderExcludeTypes;
foreach (var tuple in _currentlyRunningProviders.Values
.Where(p => p.Item1.RequiresInternet && (!enableInternetProviders || internetProviderExcludeTypes.Contains(p.Item2.GetType().Name, StringComparer.OrdinalIgnoreCase)))
.ToList())
{
tuple.Item3.Cancel();
}
}
/// <summary>
/// Downloads the and save image.
/// </summary>
/// <param name="item">The item.</param>
/// <param name="source">The source.</param>
/// <param name="targetName">Name of the target.</param>
/// <param name="resourcePool">The resource pool.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task{System.String}.</returns>
/// <exception cref="System.ArgumentNullException">item</exception>
public async Task<string> DownloadAndSaveImage(BaseItem item, string source, string targetName, SemaphoreSlim resourcePool, CancellationToken cancellationToken)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
if (string.IsNullOrEmpty(source))
{
throw new ArgumentNullException("source");
}
if (string.IsNullOrEmpty(targetName))
{
throw new ArgumentNullException("targetName");
}
if (resourcePool == null)
{
throw new ArgumentNullException("resourcePool");
}
//download and save locally
var localPath = Kernel.Configuration.SaveLocalMeta ?
Path.Combine(item.MetaLocation, targetName) :
_remoteImageCache.GetResourcePath(item.GetType().FullName + item.Path.ToLower(), targetName);
var img = await Kernel.HttpManager.FetchToMemoryStream(source, resourcePool, cancellationToken).ConfigureAwait(false);
if (Kernel.Configuration.SaveLocalMeta) // queue to media directories
{
await Kernel.FileSystemManager.SaveToLibraryFilesystem(item, localPath, img, cancellationToken).ConfigureAwait(false);
}
else
{
// we can write directly here because it won't affect the watchers
try
{
using (var fs = new FileStream(localPath, FileMode.Create, FileAccess.Write, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, FileOptions.Asynchronous))
{
await img.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, cancellationToken).ConfigureAwait(false);
}
}
catch (OperationCanceledException)
{
throw;
}
catch (Exception e)
{
Logger.ErrorException("Error downloading and saving image " + localPath, e);
throw;
}
finally
{
img.Dispose();
}
}
return localPath;
}
/// <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 override void Dispose(bool dispose)
{
if (dispose)
{
_remoteImageCache.Dispose();
}
base.Dispose(dispose);
}
}
}