/// <summary>
/// Private method that contains the actual logic for adding a download
/// </summary>
/// <param name="item"></param>
private void InternalAddDownload(IDownloadItem item)
{
// Check dirs
if (!Directory.Exists(Config.Instance.GetInProgressDownloadsFolder()))
{
Directory.CreateDirectory(Config.Instance.GetInProgressDownloadsFolder());
}
if (!Directory.Exists(Config.Instance.GetCompleteDownloadsFolder()))
{
Directory.CreateDirectory(Config.Instance.GetCompleteDownloadsFolder());
}
// Create and store downloader
IDownloader dl = DownloaderFactory.CreateFrom(item.DownloadUri);
dl.SetItem(item);
// Register events
dl.DownloadProgressChanged += IDownloader_DownloadProgressChanged;
dl.DownloadStatusChanged += IDownloader_DownloadStatusChanged;
downloads[dl.CurrentDownloadItem] = dl;
// Fire event
DownloadAdded?.Invoke(this, new DownloadEventArgs(dl.CurrentDownloadItem));
UpdateActiveDownloads();
SaveDownloads();
}
/// <summary>
/// Runs all enabled post processors against a <code>DownloadItem</code>, assuming the item has completed
/// </summary>
/// <param name="item"></param>
public void Run(IDownloadItem item)
{
foreach (var pp in PostProcessors.Where(pp => pp.Enabled || pp.Mandatory).OrderBy(pp => pp.Priority))
{
pp.Run(item);
}
}
public static void StartQueue(string url = null)
{
if (url != null)
{
_queueUrl = url;
}
if (_queueUrl == null)
{
throw new Exception("DownloadManager：下载队列没有设置Url");
}
int num = LoaderMaxCount - _currentLoaderCount;
for (int i = 0; i < num; i++)
{
if (_queue.Count == 0)
{
break;
}
IDownloadItem item = _queue.Dequeue();
DownloadItem downloadItem = new DownloadItem(_queueUrl + item.Path, item.Md5, item.Size,
AssetLoader.ExternalHotfixPath + "/" + item.Path);
downloadItem.Start(OnQueueItemProgress, OnQueueItemError, OnQueueItemLoaded, null);
_currentLoaderCount++;
}
}
/// <summary>
/// Given that download items are presently made as a generic DownloadItem from the API POST, this method
/// will take that and parse the soulseek data from the DownloadUri
/// </summary>
/// <param name="item">Any download item with a fake soulseek-like Uri</param>
/// <returns>The parsed download information</returns>
/// <exception cref="ArgumentException">Thrown when the <paramref name="item"/>does not contain a valid faked soulseek uri</exception>
public static SoulseekDownloadItem ParseFrom(IDownloadItem item)
{
if (item is SoulseekDownloadItem ssItem)
{
return(ssItem);
}
return(FakeSoulseekUriBuilder.DeconstructFrom(item));
}
/// <summary>
/// Adds a download at the end of the queue.
/// </summary>
/// <param name="downloadItem">The download to add.</param>
public void AddDownload(IDownloadItem downloadItem)
{
if (_downloadQueue.Any(p => p.RssItem.Guid == downloadItem.RssItem.Guid))
{
return;
}
_downloadQueue.AddLast(downloadItem);
RaiseDownloadAdded(new DownloadAddedEventArgs(downloadItem));
}
public async Task StartDownload(string url)
{
IDownloadItem item = await downloadItemFactory(url);
Downloads.Add(item);
await item.Start();
if (Downloads.Count > 0)
{
IsCancelAllEnabled = true;
}
}
/// <summary>
/// Send a download request to the Cache Server. Listen to the DownloadComplete event to read the results.
/// </summary>
/// <param name="downloadItem">The IDownloadItem that specifies which file to download</param>
public void QueueDownload(IDownloadItem downloadItem)
{
m_stream.Write(Encoding.ASCII.GetBytes(CmdGet + (char)downloadItem.Type), 0, 2);
m_stream.Write(downloadItem.Id.guid, 0, GuidLen);
m_stream.Write(downloadItem.Id.hash, 0, HashLen);
m_downloadQueue.Enqueue(downloadItem);
if (m_downloadQueue.Count == 1)
{
ReadNextDownloadResult();
}
}
/// <summary>
/// Downloads a file asynchronously.
/// </summary>
/// <param name="address">The address of the resource to download.</param>
/// <param name="filename">The name of the local file that is to receive the data.</param>
/// <param name="downloadItem">The download item.</param>
/// <param name="token">The token for cancelling the operation.</param>
/// <returns>Returns a Task.</returns>
private Task <object> DownloadFileAsync(
string address,
string filename,
IDownloadItem downloadItem,
CancellationToken token)
{
var tcs = new TaskCompletionSource <object>();
var webClient = _composer.GetExportedValue <IWebDownloader>();
token.Register(webClient.CancelAsync);
webClient.DownloadFileCompleted += (obj, args) =>
{
if (args.Cancelled)
{
tcs.TrySetCanceled();
downloadItem.DownloadState = DownloadState.Stopped;
return;
}
if (args.Error != null)
{
tcs.TrySetException(args.Error);
downloadItem.DownloadState = DownloadState.Error;
return;
}
tcs.TrySetResult(null);
downloadItem.DownloadState = DownloadState.Finished;
};
webClient.DownloadProgressChanged += (obj, args) =>
{
downloadItem.ProgressPercentage = args.ProgressPercentage;
downloadItem.BytesReceived = args.BytesReceived;
downloadItem.TotalBytesToReceive = args.TotalBytesToReceive;
};
try
{
webClient.DownloadFileAsync(new Uri(address), filename);
downloadItem.DownloadState = DownloadState.Downloading;
}
catch (UriFormatException ex)
{
tcs.TrySetException(ex);
}
return(tcs.Task);
}
public static DownloadItem Load(IDownloadItem downloadItem, string localPath, Action <DownloadItem> onComplete,
Action <DownloadItem> onError, Action <float> onProgress, Action <DownloadItem> onCancel = null)
{
_onComplete = onComplete;
_onProgress = onProgress;
_onError = onError;
_onCancel = onCancel;
DownloadItem item = new DownloadItem(downloadItem.Path, downloadItem.Md5, downloadItem.Size, localPath,
downloadItem.FileType);
item.Start(OnProgress, OnError, OnLoaded, OnCancel);
return(item);
}
/// <summary>
/// Gets the download address.
/// </summary>
/// <param name="downloadItem">The download item.</param>
/// <returns>Returns the URI of the download item.</returns>
private string GetDownloadAddress(IDownloadItem downloadItem)
{
var media = new MediaContent {
FileSize = 0
};
foreach (var mediaContent in downloadItem.RssItem.MediaGroup)
{
if (mediaContent.FileSize > media.FileSize)
{
media = mediaContent;
}
}
return(media.Url);
}
/// <summary>
/// Does the opposite of BuildFrom - it takes a faked uri and creates a downloadable item.
/// This also copies all of the other properties from the IDownloadItem into the new SoulseekDownloadItem
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public static SoulseekDownloadItem DeconstructFrom(IDownloadItem item)
{
// Do the thing we're here for
var newItem = DeconstructFrom(item.DownloadUri);
// Copy all the other properties
newItem.CompletedFilename = item.CompletedFilename;
newItem.Content = item.Content;
newItem.DownloadingFilename = item.DownloadingFilename;
newItem.DownloadUri = item.DownloadUri;
newItem.Id = item.Id;
newItem.Progress = item.Progress;
// Return the newly created item
return(newItem);
}
public void SetItem(IDownloadItem item)
{
// I keep making this mistake - the ParseFrom method can return a new IDownloadItem, so then referencing `item` after
// that references the old one, and so setting the values on that doesn't help anything...
CurrentSSDownloadItem = SoulseekDownloadItem.ParseFrom(item);
CurrentSSDownloadItem.DownloadingFilename = HttpUtility.UrlDecode(CurrentSSDownloadItem.DownloadUri.Segments.Last());
CurrentSSDownloadItem.CompletedFilename = CurrentSSDownloadItem.DownloadingFilename;
CurrentSSDownloadItem.Progress = new DownloadProgress
{
BytesTotal = 0,
BytesDownloaded = 0,
Status = DownloadStatus.Pending
};
DownloadStatusChanged?.Invoke(this, new DownloadEventArgs(CurrentDownloadItem));
}
protected virtual void SetItem(IDownloadItem item, Uri actualDownloadUri)
{
CurrentDownloadItem = item;
item.DownloadingFilename = HttpUtility.UrlDecode(actualDownloadUri.Segments.Last());
item.CompletedFilename = item.DownloadingFilename;
downloader = new PausableEventedDownloader(actualDownloadUri, item.GetDownloadingPath());
downloader.ProgressChanged += Downloader_ProgressChanged;
downloader.StatusChanged += Downloader_StatusChanged;
downloader.ReceivedResponseFilename += Downloader_ReceivedResponseFilename;
item.Progress = new DownloadProgress
{
BytesTotal = 0,
BytesDownloaded = 0,
Status = DownloadStatus.Pending
};
// Now it's ready, invoke the handler to get download manager to start (or update)
DownloadStatusChanged?.Invoke(this, new DownloadEventArgs(CurrentDownloadItem));
}
public void Cancel(IDownloadItem item) => downloads[item].Cancel();
/// <summary>
/// Initializes a new instance of the <see cref="DownloadAddedEventArgs"/> class.
/// </summary>
/// <param name="downloadItem">The added download.</param>
public DownloadAddedEventArgs(IDownloadItem downloadItem)
{
DownloadItem = downloadItem;
}
public void Run(IDownloadItem item)
{
File.Move(item.GetDownloadingPath(), item.GetCompletedPath());
}
/// <summary>
/// Initializes a new instance of the <see cref="DownloadAddedEventArgs"/> class.
/// </summary>
/// <param name="downloadItem">The added download.</param>
public DownloadAddedEventArgs(IDownloadItem downloadItem)
{
DownloadItem = downloadItem;
}
/// <summary>
/// Gets the download address.
/// </summary>
/// <param name="downloadItem">The download item.</param>
/// <returns>Returns the URI of the download item.</returns>
private string GetDownloadAddress(IDownloadItem downloadItem)
{
var media = new MediaContent { FileSize = 0 };
foreach (var mediaContent in downloadItem.RssItem.MediaGroup)
{
if (mediaContent.FileSize > media.FileSize)
{
media = mediaContent;
}
}
return media.Url;
}
/// <summary>
/// Downloads a file asynchronously.
/// </summary>
/// <param name="address">The address of the resource to download.</param>
/// <param name="filename">The name of the local file that is to receive the data.</param>
/// <param name="downloadItem">The download item.</param>
/// <param name="token">The token for cancelling the operation.</param>
/// <returns>Returns a Task.</returns>
private Task<object> DownloadFileAsync(
string address,
string filename,
IDownloadItem downloadItem,
CancellationToken token)
{
var tcs = new TaskCompletionSource<object>();
var webClient = _composer.GetExportedValue<IWebDownloader>();
token.Register(webClient.CancelAsync);
webClient.DownloadFileCompleted += (obj, args) =>
{
if (args.Cancelled)
{
tcs.TrySetCanceled();
downloadItem.DownloadState = DownloadState.Stopped;
return;
}
if (args.Error != null)
{
tcs.TrySetException(args.Error);
downloadItem.DownloadState = DownloadState.Error;
return;
}
tcs.TrySetResult(null);
downloadItem.DownloadState = DownloadState.Finished;
};
webClient.DownloadProgressChanged += (obj, args) =>
{
downloadItem.ProgressPercentage = args.ProgressPercentage;
downloadItem.BytesReceived = args.BytesReceived;
downloadItem.TotalBytesToReceive = args.TotalBytesToReceive;
};
try
{
webClient.DownloadFileAsync(new Uri(address), filename);
downloadItem.DownloadState = DownloadState.Downloading;
}
catch (UriFormatException ex)
{
tcs.TrySetException(ex);
}
return tcs.Task;
}
/// <summary>
/// Adds a download at the end of the queue.
/// </summary>
/// <param name="downloadItem">The download to add.</param>
public void AddDownload(IDownloadItem downloadItem)
{
if (_downloadQueue.Any(p => p.RssItem.Guid == downloadItem.RssItem.Guid))
{
return;
}
_downloadQueue.AddLast(downloadItem);
RaiseDownloadAdded(new DownloadAddedEventArgs(downloadItem));
}
public virtual void SetItem(IDownloadItem item) => SetItem(item, item.DownloadUri);
public void Resume(IDownloadItem item) => GetExistingDownload(item).Resume();
public void Pause(IDownloadItem item) => GetExistingDownload(item).Pause();
public DownloadProgress GetProgress(IDownloadItem item) => GetExistingDownload(item).CurrentDownloadItem.Progress;
public async override void SetItem(IDownloadItem item) => base.SetItem(item, await GetActualDownloadUri(item.DownloadUri));
/// <summary>
/// Removes a <see cref="DownloadItem"/> on the main thread.
/// </summary>
/// <param name="downloadItem">The download to remove.</param>
private void RemoveDownloadItemOnMainThread(IDownloadItem downloadItem)
{
_mainThreadDispatcher.Invoke(new CollectionInitializerDelegate(p => _downloads.Remove(p)), downloadItem);
}
/// <summary>
/// Initializes a new instance of the <see cref="DownloadRemovedEventArgs"/> class.
/// </summary>
/// <param name="downloadItem">The download that has been removed.</param>
public DownloadRemovedEventArgs(IDownloadItem downloadItem)
{
DownloadItem = downloadItem;
}
public DownloadEventArgs(IDownloadItem item) => Target = item;
/// <summary>
/// Removes a <see cref="DownloadItem"/> on the main thread.
/// </summary>
/// <param name="downloadItem">The download to remove.</param>
private void RemoveDownloadItemOnMainThread(IDownloadItem downloadItem)
{
_mainThreadDispatcher.Invoke(new CollectionInitializerDelegate(p => _downloads.Remove(p)), downloadItem);
}
/// <summary> /// Returns the downloader for a specified download item if it exists, otherwise it throws an exception /// </summary> /// <param name="item"></param> /// <returns></returns> private IDownloader GetExistingDownload(IDownloadItem item) => DownloadQueue.Contains(item) ? downloads[item] : throw new KeyNotFoundException();
/// <summary>
/// Initializes a new instance of the <see cref="DownloadRemovedEventArgs"/> class.
/// </summary>
/// <param name="downloadItem">The download that has been removed.</param>
public DownloadRemovedEventArgs(IDownloadItem downloadItem)
{
DownloadItem = downloadItem;
}
public void Enqueue(IDownloadItem item) => InternalAddDownload(item);