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osu-lazer/osu.Game/Database/ModelDownloader.cs

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// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using Humanizer;
using osu.Framework.Logging;
using osu.Game.Extensions;
using osu.Game.Online.API;
using osu.Game.Overlays.Notifications;
namespace osu.Game.Database
{
public abstract partial class ModelDownloader<TModel, T> : IModelDownloader<T>
where TModel : class, IHasGuidPrimaryKey, ISoftDelete, IEquatable<TModel>, T
where T : class
{
public Action<Notification>? PostNotification { protected get; set; }
public event Action<ArchiveDownloadRequest<T>>? DownloadBegan;
public event Action<ArchiveDownloadRequest<T>>? DownloadFailed;
private readonly IModelImporter<TModel> importer;
private readonly IAPIProvider? api;
protected readonly List<ArchiveDownloadRequest<T>> CurrentDownloads = new List<ArchiveDownloadRequest<T>>();
protected ModelDownloader(IModelImporter<TModel> importer, IAPIProvider? api)
{
this.importer = importer;
this.api = api;
}
/// <summary>
/// Creates the download request for this <typeparamref name="T"/>.
/// </summary>
/// <param name="model">The <typeparamref name="T"/> to be downloaded.</param>
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/// <param name="minimiseDownloadSize">Whether this download should be optimised for slow connections. Generally means extras are not included in the download bundle.</param>
/// <returns>The request object.</returns>
protected abstract ArchiveDownloadRequest<T> CreateDownloadRequest(T model, bool minimiseDownloadSize);
public bool Download(T model, bool minimiseDownloadSize = false) => Download(model, minimiseDownloadSize, null);
public void DownloadAsUpdate(TModel originalModel, bool minimiseDownloadSize) => Download(originalModel, minimiseDownloadSize, originalModel);
protected bool Download(T model, bool minimiseDownloadSize, TModel? originalModel)
{
if (!canDownload(model)) return false;
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var request = CreateDownloadRequest(model, minimiseDownloadSize);
DownloadNotification notification = new DownloadNotification
{
Text = $"Downloading {request.Model.GetDisplayString()}",
};
request.DownloadProgressed += progress =>
{
notification.State = ProgressNotificationState.Active;
notification.Progress = progress;
};
request.Success += filename =>
{
Task.Factory.StartNew(async () =>
{
bool importSuccessful;
if (originalModel != null)
importSuccessful = (await importer.ImportAsUpdate(notification, new ImportTask(filename), originalModel).ConfigureAwait(false)) != null;
else
importSuccessful = (await importer.Import(notification, new[] { new ImportTask(filename) }).ConfigureAwait(false)).Any();
// for now a failed import will be marked as a failed download for simplicity.
if (!importSuccessful)
DownloadFailed?.Invoke(request);
CurrentDownloads.Remove(request);
}, TaskCreationOptions.LongRunning);
};
request.Failure += triggerFailure;
notification.CancelRequested += () =>
{
request.Cancel();
return true;
};
CurrentDownloads.Add(request);
PostNotification?.Invoke(notification);
api?.PerformAsync(request);
DownloadBegan?.Invoke(request);
return true;
void triggerFailure(Exception error)
{
CurrentDownloads.Remove(request);
DownloadFailed?.Invoke(request);
notification.State = ProgressNotificationState.Cancelled;
if (!(error is OperationCanceledException))
{
if (error is WebException webException && webException.Message == @"TooManyRequests")
{
notification.Close(false);
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PostNotification?.Invoke(new TooManyDownloadsNotification());
}
else
Logger.Error(error, $"{importer.HumanisedModelName.Titleize()} download failed!");
}
}
}
public abstract ArchiveDownloadRequest<T>? GetExistingDownload(T model);
private bool canDownload(T model) => GetExistingDownload(model) == null && api != null;
private partial class DownloadNotification : ProgressNotification
{
public override bool IsImportant => false;
protected override Notification CreateCompletionNotification() => new SilencedProgressCompletionNotification
{
Activated = CompletionClickAction,
Text = CompletionText
};
private partial class SilencedProgressCompletionNotification : ProgressCompletionNotification
{
public override bool IsImportant => false;
}
}
}
}