jellyfin/MediaBrowser.Server.Implementations/Providers/ProviderManager.cs
2013-05-18 13:07:20 -04:00

490 lines
20 KiB
C#

using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.IO;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.IO;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Logging;
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.Server.Implementations.Providers
{
/// <summary>
/// Class ProviderManager
/// </summary>
public class ProviderManager : IProviderManager
{
/// <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>
/// The _logger
/// </summary>
private readonly ILogger _logger;
/// <summary>
/// The _HTTP client
/// </summary>
private readonly IHttpClient _httpClient;
/// <summary>
/// The _directory watchers
/// </summary>
private readonly IDirectoryWatchers _directoryWatchers;
/// <summary>
/// Gets or sets the configuration manager.
/// </summary>
/// <value>The configuration manager.</value>
private IServerConfigurationManager ConfigurationManager { get; set; }
/// <summary>
/// Gets the list of currently registered metadata prvoiders
/// </summary>
/// <value>The metadata providers enumerable.</value>
private BaseMetadataProvider[] MetadataProviders { get; set; }
/// <summary>
/// Initializes a new instance of the <see cref="ProviderManager" /> class.
/// </summary>
/// <param name="httpClient">The HTTP client.</param>
/// <param name="configurationManager">The configuration manager.</param>
/// <param name="directoryWatchers">The directory watchers.</param>
/// <param name="logManager">The log manager.</param>
public ProviderManager(IHttpClient httpClient, IServerConfigurationManager configurationManager, IDirectoryWatchers directoryWatchers, ILogManager logManager)
{
_logger = logManager.GetLogger("ProviderManager");
_httpClient = httpClient;
ConfigurationManager = configurationManager;
_directoryWatchers = directoryWatchers;
_remoteImageCache = new FileSystemRepository(configurationManager.ApplicationPaths.DownloadedImagesDataPath);
configurationManager.ConfigurationUpdated += configurationManager_ConfigurationUpdated;
}
/// <summary>
/// Handles the ConfigurationUpdated event of the configurationManager control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="EventArgs" /> instance containing the event data.</param>
void configurationManager_ConfigurationUpdated(object sender, EventArgs e)
{
// Validate currently executing providers, in the background
Task.Run(() => ValidateCurrentlyRunningProviders());
}
/// <summary>
/// Adds the metadata providers.
/// </summary>
/// <param name="providers">The providers.</param>
public void AddMetadataProviders(IEnumerable<BaseMetadataProvider> providers)
{
MetadataProviders = providers.OrderBy(e => e.Priority).ToArray();
}
/// <summary>
/// The _supported providers key
/// </summary>
private readonly Guid _supportedProvidersKey = "SupportedProviders".GetMD5();
/// <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>
public 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 = MetadataProviders.Where(p => p.Supports(item)).ToList();
BaseProviderInfo supportedProvidersInfo;
var supportedProvidersValue = string.Join(string.Empty, supportedProviders.Select(i => i.GetType().Name));
var providersChanged = false;
item.ProviderData.TryGetValue(_supportedProvidersKey, out supportedProvidersInfo);
var supportedProvidersHash = supportedProvidersValue.GetMD5();
if (supportedProvidersInfo != null)
{
// Force refresh if the supported providers have changed
providersChanged = force = force || supportedProvidersHash != supportedProvidersInfo.Data;
// 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();
}
}
if (providersChanged)
{
supportedProvidersInfo.Data = 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 && !ConfigurationManager.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 && ConfigurationManager.Configuration.EnableInternetProviders && ConfigurationManager.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(FetchAsync(provider, 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>
/// Fetches metadata and returns true or false indicating if any work that requires persistence was done
/// </summary>
/// <param name="provider">The provider.</param>
/// <param name="item">The item.</param>
/// <param name="force">if set to <c>true</c> [force].</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task{System.Boolean}.</returns>
/// <exception cref="System.ArgumentNullException"></exception>
private async Task<bool> FetchAsync(BaseMetadataProvider provider, BaseItem item, bool force, CancellationToken cancellationToken)
{
if (item == null)
{
throw new ArgumentNullException();
}
cancellationToken.ThrowIfCancellationRequested();
_logger.Debug("Running {0} for {1}", provider.GetType().Name, item.Path ?? item.Name ?? "--Unknown--");
// This provides the ability to cancel just this one provider
var innerCancellationTokenSource = new CancellationTokenSource();
OnProviderRefreshBeginning(provider, item, innerCancellationTokenSource);
try
{
return await provider.FetchAsync(item, force, CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, innerCancellationTokenSource.Token).Token).ConfigureAwait(false);
}
catch (OperationCanceledException ex)
{
_logger.Debug("{0} canceled for {1}", provider.GetType().Name, item.Name);
// If the outer cancellation token is the one that caused the cancellation, throw it
if (cancellationToken.IsCancellationRequested && ex.CancellationToken == cancellationToken)
{
throw;
}
return false;
}
catch (Exception ex)
{
_logger.ErrorException("{0} failed refreshing {1}", ex, provider.GetType().Name, item.Name);
provider.SetLastRefreshed(item, DateTime.UtcNow, ProviderRefreshStatus.Failure);
return true;
}
finally
{
innerCancellationTokenSource.Dispose();
OnProviderRefreshCompleted(provider, item);
}
}
/// <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>
public 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>
public 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>
private void ValidateCurrentlyRunningProviders()
{
var enableInternetProviders = ConfigurationManager.Configuration.EnableInternetProviders;
var internetProviderExcludeTypes = ConfigurationManager.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="saveLocally">if set to <c>true</c> [save locally].</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, bool saveLocally, 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 = (saveLocally && item.MetaLocation != null) ?
Path.Combine(item.MetaLocation, targetName) :
_remoteImageCache.GetResourcePath(item.GetType().FullName + item.Path.ToLower(), targetName);
var img = await _httpClient.Get(source, resourcePool, cancellationToken).ConfigureAwait(false);
if (saveLocally) // queue to media directories
{
await 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>
/// Gets the save path.
/// </summary>
/// <param name="item">The item.</param>
/// <param name="targetFileName">Name of the target file.</param>
/// <param name="saveLocally">if set to <c>true</c> [save locally].</param>
/// <returns>System.String.</returns>
public string GetSavePath(BaseItem item, string targetFileName, bool saveLocally)
{
return (saveLocally && item.MetaLocation != null) ?
Path.Combine(item.MetaLocation, targetFileName) :
_remoteImageCache.GetResourcePath(item.GetType().FullName + item.Id.ToString(), targetFileName);
}
/// <summary>
/// Saves to library filesystem.
/// </summary>
/// <param name="item">The item.</param>
/// <param name="path">The path.</param>
/// <param name="dataToSave">The data to save.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException"></exception>
public async Task SaveToLibraryFilesystem(BaseItem item, string path, Stream dataToSave, CancellationToken cancellationToken)
{
if (item == null)
{
throw new ArgumentNullException();
}
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException();
}
if (dataToSave == null)
{
throw new ArgumentNullException();
}
if (cancellationToken == null)
{
throw new ArgumentNullException();
}
if (cancellationToken.IsCancellationRequested)
{
dataToSave.Dispose();
cancellationToken.ThrowIfCancellationRequested();
}
//Tell the watchers to ignore
_directoryWatchers.TemporarilyIgnore(path);
if (dataToSave.CanSeek)
{
dataToSave.Position = 0;
}
if (!(dataToSave is MemoryStream || dataToSave is FileStream))
{
var ms = new MemoryStream();
using (dataToSave)
{
await dataToSave.CopyToAsync(ms).ConfigureAwait(false);
}
ms.Position = 0;
dataToSave = ms;
}
try
{
using (dataToSave)
{
using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, FileOptions.Asynchronous))
{
await dataToSave.CopyToAsync(fs, StreamDefaults.DefaultCopyToBufferSize, cancellationToken).ConfigureAwait(false);
}
}
// If this is ever used for something other than metadata we can add a file type param
item.ResolveArgs.AddMetadataFile(path);
}
finally
{
//Remove the ignore
_directoryWatchers.RemoveTempIgnore(path);
}
}
}
}