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https://github.com/ppy/osu
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111 lines
4.3 KiB
C#
111 lines
4.3 KiB
C#
// 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.
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using System;
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using System.Linq;
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using osu.Framework.Bindables;
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using osu.Framework.Logging;
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using osu.Framework.Threading;
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using osu.Game.Beatmaps;
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namespace osu.Game.Online.Rooms
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{
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/// <summary>
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/// Represent a checksum-verifying beatmap availability tracker usable for online play screens.
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///
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/// This differs from a regular download tracking composite as this accounts for the
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/// databased beatmap set's checksum, to disallow from playing with an altered version of the beatmap.
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/// </summary>
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public class OnlinePlayBeatmapAvailabilityTracker : DownloadTrackingComposite<BeatmapSetInfo, BeatmapManager>
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{
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public readonly IBindable<PlaylistItem> SelectedItem = new Bindable<PlaylistItem>();
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/// <summary>
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/// The availability state of the currently selected playlist item.
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/// </summary>
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public IBindable<BeatmapAvailability> Availability => availability;
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private readonly Bindable<BeatmapAvailability> availability = new Bindable<BeatmapAvailability>(BeatmapAvailability.LocallyAvailable());
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private ScheduledDelegate progressUpdate;
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protected override void LoadComplete()
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{
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base.LoadComplete();
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SelectedItem.BindValueChanged(item =>
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{
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// the underlying playlist is regularly cleared for maintenance purposes (things which probably need to be fixed eventually).
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// to avoid exposing a state change when there may actually be none, ignore all nulls for now.
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if (item.NewValue == null)
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return;
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Model.Value = item.NewValue.Beatmap.Value.BeatmapSet;
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}, true);
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Progress.BindValueChanged(_ =>
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{
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if (State.Value != DownloadState.Downloading)
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return;
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// incoming progress changes are going to be at a very high rate.
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// we don't want to flood the network with this, so rate limit how often we send progress updates.
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if (progressUpdate?.Completed != false)
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progressUpdate = Scheduler.AddDelayed(updateAvailability, progressUpdate == null ? 0 : 500);
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});
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State.BindValueChanged(_ => updateAvailability(), true);
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}
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protected override bool VerifyDatabasedModel(BeatmapSetInfo databasedSet)
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{
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int? beatmapId = SelectedItem.Value.Beatmap.Value.OnlineBeatmapID;
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string checksum = SelectedItem.Value.Beatmap.Value.MD5Hash;
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var matchingBeatmap = databasedSet.Beatmaps.FirstOrDefault(b => b.OnlineBeatmapID == beatmapId && b.MD5Hash == checksum);
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if (matchingBeatmap == null)
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{
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Logger.Log("The imported beatmap set does not match the online version.", LoggingTarget.Runtime, LogLevel.Important);
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return false;
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}
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return true;
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}
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protected override bool IsModelAvailableLocally()
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{
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int? beatmapId = SelectedItem.Value.Beatmap.Value.OnlineBeatmapID;
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string checksum = SelectedItem.Value.Beatmap.Value.MD5Hash;
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var beatmap = Manager.QueryBeatmap(b => b.OnlineBeatmapID == beatmapId && b.MD5Hash == checksum);
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return beatmap?.BeatmapSet.DeletePending == false;
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}
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private void updateAvailability()
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{
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switch (State.Value)
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{
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case DownloadState.NotDownloaded:
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availability.Value = BeatmapAvailability.NotDownloaded();
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break;
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case DownloadState.Downloading:
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availability.Value = BeatmapAvailability.Downloading((float)Progress.Value);
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break;
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case DownloadState.Importing:
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availability.Value = BeatmapAvailability.Importing();
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break;
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case DownloadState.LocallyAvailable:
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availability.Value = BeatmapAvailability.LocallyAvailable();
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break;
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default:
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throw new ArgumentOutOfRangeException(nameof(State));
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}
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}
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}
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}
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