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927 lines
38 KiB
C#
927 lines
38 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.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using Humanizer;
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using JetBrains.Annotations;
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using Microsoft.EntityFrameworkCore;
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using osu.Framework.Extensions;
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using osu.Framework.Extensions.IEnumerableExtensions;
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using osu.Framework.Logging;
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using osu.Framework.Platform;
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using osu.Framework.Threading;
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using osu.Game.Extensions;
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using osu.Game.IO;
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using osu.Game.IO.Archives;
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using osu.Game.IPC;
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using osu.Game.Overlays.Notifications;
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using SharpCompress.Archives.Zip;
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namespace osu.Game.Database
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{
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/// <summary>
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/// Encapsulates a model store class to give it import functionality.
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/// Adds cross-functionality with <see cref="FileStore"/> to give access to the central file store for the provided model.
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/// </summary>
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/// <typeparam name="TModel">The model type.</typeparam>
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/// <typeparam name="TFileModel">The associated file join type.</typeparam>
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public abstract class ArchiveModelManager<TModel, TFileModel> : IModelImporter<TModel>, IModelManager<TModel>, IModelFileManager<TModel, TFileModel>
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where TModel : class, IHasFiles<TFileModel>, IHasPrimaryKey, ISoftDelete
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where TFileModel : class, INamedFileInfo, IHasPrimaryKey, new()
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{
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private const int import_queue_request_concurrency = 1;
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/// <summary>
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/// The size of a batch import operation before considering it a lower priority operation.
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/// </summary>
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private const int low_priority_import_batch_size = 1;
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/// <summary>
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/// A singleton scheduler shared by all <see cref="ArchiveModelManager{TModel,TFileModel}"/>.
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/// </summary>
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/// <remarks>
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/// This scheduler generally performs IO and CPU intensive work so concurrency is limited harshly.
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/// It is mainly being used as a queue mechanism for large imports.
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/// </remarks>
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private static readonly ThreadedTaskScheduler import_scheduler = new ThreadedTaskScheduler(import_queue_request_concurrency, nameof(ArchiveModelManager<TModel, TFileModel>));
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/// <summary>
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/// A second scheduler for lower priority imports.
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/// For simplicity, these will just run in parallel with normal priority imports, but a future refactor would see this implemented via a custom scheduler/queue.
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/// See https://gist.github.com/peppy/f0e118a14751fc832ca30dd48ba3876b for an incomplete version of this.
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/// </summary>
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private static readonly ThreadedTaskScheduler import_scheduler_low_priority = new ThreadedTaskScheduler(import_queue_request_concurrency, nameof(ArchiveModelManager<TModel, TFileModel>));
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public Action<Notification> PostNotification { protected get; set; }
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/// <summary>
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/// Fired when a new or updated <typeparamref name="TModel"/> becomes available in the database.
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/// This is not guaranteed to run on the update thread.
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/// </summary>
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public event Action<TModel> ItemUpdated;
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/// <summary>
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/// Fired when a <typeparamref name="TModel"/> is removed from the database.
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/// This is not guaranteed to run on the update thread.
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/// </summary>
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public event Action<TModel> ItemRemoved;
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public virtual IEnumerable<string> HandledExtensions => new[] { @".zip" };
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protected readonly FileStore Files;
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protected readonly IDatabaseContextFactory ContextFactory;
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protected readonly MutableDatabaseBackedStore<TModel> ModelStore;
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// ReSharper disable once NotAccessedField.Local (we should keep a reference to this so it is not finalised)
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private ArchiveImportIPCChannel ipc;
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private readonly Storage exportStorage;
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protected ArchiveModelManager(Storage storage, IDatabaseContextFactory contextFactory, MutableDatabaseBackedStoreWithFileIncludes<TModel, TFileModel> modelStore, IIpcHost importHost = null)
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{
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ContextFactory = contextFactory;
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ModelStore = modelStore;
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ModelStore.ItemUpdated += item => handleEvent(() => ItemUpdated?.Invoke(item));
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ModelStore.ItemRemoved += item => handleEvent(() => ItemRemoved?.Invoke(item));
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exportStorage = storage.GetStorageForDirectory(@"exports");
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Files = new FileStore(contextFactory, storage);
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if (importHost != null)
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ipc = new ArchiveImportIPCChannel(importHost, this);
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ModelStore.Cleanup();
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}
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/// <summary>
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/// Import one or more <typeparamref name="TModel"/> items from filesystem <paramref name="paths"/>.
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/// </summary>
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/// <remarks>
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/// This will be treated as a low priority import if more than one path is specified; use <see cref="Import(ImportTask[])"/> to always import at standard priority.
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/// This will post notifications tracking progress.
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/// </remarks>
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/// <param name="paths">One or more archive locations on disk.</param>
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public Task Import(params string[] paths)
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{
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var notification = new ImportProgressNotification();
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PostNotification?.Invoke(notification);
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return Import(notification, paths.Select(p => new ImportTask(p)).ToArray());
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}
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public Task Import(params ImportTask[] tasks)
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{
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var notification = new ImportProgressNotification();
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PostNotification?.Invoke(notification);
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return Import(notification, tasks);
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}
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public async Task<IEnumerable<ILive<TModel>>> Import(ProgressNotification notification, params ImportTask[] tasks)
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{
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if (tasks.Length == 0)
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{
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notification.CompletionText = $"No {HumanisedModelName}s were found to import!";
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notification.State = ProgressNotificationState.Completed;
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return Enumerable.Empty<ILive<TModel>>();
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}
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notification.Progress = 0;
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notification.Text = $"{HumanisedModelName.Humanize(LetterCasing.Title)} import is initialising...";
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int current = 0;
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var imported = new List<ILive<TModel>>();
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bool isLowPriorityImport = tasks.Length > low_priority_import_batch_size;
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try
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{
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await Task.WhenAll(tasks.Select(async task =>
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{
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notification.CancellationToken.ThrowIfCancellationRequested();
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try
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{
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var model = await Import(task, isLowPriorityImport, notification.CancellationToken).ConfigureAwait(false);
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lock (imported)
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{
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if (model != null)
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imported.Add(model);
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current++;
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notification.Text = $"Imported {current} of {tasks.Length} {HumanisedModelName}s";
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notification.Progress = (float)current / tasks.Length;
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}
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}
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catch (TaskCanceledException)
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{
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throw;
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}
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catch (Exception e)
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{
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Logger.Error(e, $@"Could not import ({task})", LoggingTarget.Database);
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}
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})).ConfigureAwait(false);
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}
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catch (OperationCanceledException)
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{
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if (imported.Count == 0)
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{
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notification.State = ProgressNotificationState.Cancelled;
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return imported;
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}
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}
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if (imported.Count == 0)
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{
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notification.Text = $"{HumanisedModelName.Humanize(LetterCasing.Title)} import failed!";
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notification.State = ProgressNotificationState.Cancelled;
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}
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else
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{
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notification.CompletionText = imported.Count == 1
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? $"Imported {imported.First().Value.GetDisplayString()}!"
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: $"Imported {imported.Count} {HumanisedModelName}s!";
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if (imported.Count > 0 && PostImport != null)
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{
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notification.CompletionText += " Click to view.";
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notification.CompletionClickAction = () =>
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{
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PostImport?.Invoke(imported);
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return true;
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};
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}
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notification.State = ProgressNotificationState.Completed;
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}
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return imported;
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}
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/// <summary>
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/// Import one <typeparamref name="TModel"/> from the filesystem and delete the file on success.
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/// Note that this bypasses the UI flow and should only be used for special cases or testing.
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/// </summary>
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/// <param name="task">The <see cref="ImportTask"/> containing data about the <typeparamref name="TModel"/> to import.</param>
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/// <param name="lowPriority">Whether this is a low priority import.</param>
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/// <param name="cancellationToken">An optional cancellation token.</param>
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/// <returns>The imported model, if successful.</returns>
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public async Task<ILive<TModel>> Import(ImportTask task, bool lowPriority = false, CancellationToken cancellationToken = default)
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{
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cancellationToken.ThrowIfCancellationRequested();
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ILive<TModel> import;
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using (ArchiveReader reader = task.GetReader())
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import = await Import(reader, lowPriority, cancellationToken).ConfigureAwait(false);
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// We may or may not want to delete the file depending on where it is stored.
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// e.g. reconstructing/repairing database with items from default storage.
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// Also, not always a single file, i.e. for LegacyFilesystemReader
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// TODO: Add a check to prevent files from storage to be deleted.
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try
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{
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if (import != null && File.Exists(task.Path) && ShouldDeleteArchive(task.Path))
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File.Delete(task.Path);
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}
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catch (Exception e)
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{
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LogForModel(import?.Value, $@"Could not delete original file after import ({task})", e);
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}
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return import;
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}
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public Action<IEnumerable<ILive<TModel>>> PostImport { protected get; set; }
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/// <summary>
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/// Silently import an item from an <see cref="ArchiveReader"/>.
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/// </summary>
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/// <param name="archive">The archive to be imported.</param>
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/// <param name="lowPriority">Whether this is a low priority import.</param>
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/// <param name="cancellationToken">An optional cancellation token.</param>
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public Task<ILive<TModel>> Import(ArchiveReader archive, bool lowPriority = false, CancellationToken cancellationToken = default)
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{
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cancellationToken.ThrowIfCancellationRequested();
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TModel model = null;
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try
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{
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model = CreateModel(archive);
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if (model == null)
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return Task.FromResult<ILive<TModel>>(null);
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}
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catch (TaskCanceledException)
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{
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throw;
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}
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catch (Exception e)
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{
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LogForModel(model, @$"Model creation of {archive.Name} failed.", e);
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return null;
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}
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return Import(model, archive, lowPriority, cancellationToken);
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}
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/// <summary>
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/// Any file extensions which should be included in hash creation.
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/// Generally should include all file types which determine the file's uniqueness.
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/// Large files should be avoided if possible.
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/// </summary>
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/// <remarks>
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/// This is only used by the default hash implementation. If <see cref="ComputeHash"/> is overridden, it will not be used.
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/// </remarks>
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protected abstract string[] HashableFileTypes { get; }
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internal static void LogForModel(TModel model, string message, Exception e = null)
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{
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string prefix = $"[{(model?.Hash ?? "?????").Substring(0, 5)}]";
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if (e != null)
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Logger.Error(e, $"{prefix} {message}", LoggingTarget.Database);
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else
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Logger.Log($"{prefix} {message}", LoggingTarget.Database);
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}
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/// <summary>
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/// Whether the implementation overrides <see cref="ComputeHash"/> with a custom implementation.
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/// Custom hash implementations must bypass the early exit in the import flow (see <see cref="computeHashFast"/> usage).
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/// </summary>
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protected virtual bool HasCustomHashFunction => false;
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/// <summary>
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/// Create a SHA-2 hash from the provided archive based on file content of all files matching <see cref="HashableFileTypes"/>.
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/// </summary>
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/// <remarks>
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/// In the case of no matching files, a hash will be generated from the passed archive's <see cref="ArchiveReader.Name"/>.
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/// </remarks>
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protected virtual string ComputeHash(TModel item)
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{
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var hashableFiles = item.Files
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.Where(f => HashableFileTypes.Any(ext => f.Filename.EndsWith(ext, StringComparison.OrdinalIgnoreCase)))
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.OrderBy(f => f.Filename)
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.ToArray();
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if (hashableFiles.Length > 0)
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{
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// for now, concatenate all hashable files in the set to create a unique hash.
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MemoryStream hashable = new MemoryStream();
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foreach (TFileModel file in hashableFiles)
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{
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using (Stream s = Files.Store.GetStream(file.FileInfo.GetStoragePath()))
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s.CopyTo(hashable);
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}
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if (hashable.Length > 0)
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return hashable.ComputeSHA2Hash();
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}
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return generateFallbackHash();
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}
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/// <summary>
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/// Silently import an item from a <typeparamref name="TModel"/>.
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/// </summary>
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/// <param name="item">The model to be imported.</param>
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/// <param name="archive">An optional archive to use for model population.</param>
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/// <param name="lowPriority">Whether this is a low priority import.</param>
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/// <param name="cancellationToken">An optional cancellation token.</param>
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public virtual async Task<ILive<TModel>> Import(TModel item, ArchiveReader archive = null, bool lowPriority = false, CancellationToken cancellationToken = default) => await Task.Factory.StartNew(async () =>
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{
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cancellationToken.ThrowIfCancellationRequested();
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bool checkedExisting = false;
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TModel existing = null;
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if (archive != null && !HasCustomHashFunction)
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{
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// this is a fast bail condition to improve large import performance.
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item.Hash = computeHashFast(archive);
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checkedExisting = true;
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existing = CheckForExisting(item);
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if (existing != null)
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{
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// bare minimum comparisons
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//
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// note that this should really be checking filesizes on disk (of existing files) for some degree of sanity.
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// or alternatively doing a faster hash check. either of these require database changes and reprocessing of existing files.
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if (CanSkipImport(existing, item) &&
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getFilenames(existing.Files).SequenceEqual(getShortenedFilenames(archive).Select(p => p.shortened).OrderBy(f => f)))
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{
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LogForModel(item, @$"Found existing (optimised) {HumanisedModelName} for {item} (ID {existing.ID}) – skipping import.");
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Undelete(existing);
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return existing.ToEntityFrameworkLive();
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}
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LogForModel(item, @"Found existing (optimised) but failed pre-check.");
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}
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}
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void rollback()
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{
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if (!Delete(item))
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{
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// We may have not yet added the model to the underlying table, but should still clean up files.
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LogForModel(item, @"Dereferencing files for incomplete import.");
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Files.Dereference(item.Files.Select(f => f.FileInfo).ToArray());
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}
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}
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delayEvents();
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try
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{
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LogForModel(item, @"Beginning import...");
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if (archive != null)
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item.Files.AddRange(createFileInfos(archive, Files));
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item.Hash = ComputeHash(item);
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await Populate(item, archive, cancellationToken).ConfigureAwait(false);
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using (var write = ContextFactory.GetForWrite()) // used to share a context for full import. keep in mind this will block all writes.
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{
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try
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{
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if (!write.IsTransactionLeader) throw new InvalidOperationException(@$"Ensure there is no parent transaction so errors can correctly be handled by {this}");
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if (!checkedExisting)
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existing = CheckForExisting(item);
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if (existing != null)
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{
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if (CanReuseExisting(existing, item))
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{
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Undelete(existing);
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LogForModel(item, @$"Found existing {HumanisedModelName} for {item} (ID {existing.ID}) – skipping import.");
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// existing item will be used; rollback new import and exit early.
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rollback();
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flushEvents(true);
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return existing.ToEntityFrameworkLive();
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}
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LogForModel(item, @"Found existing but failed re-use check.");
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Delete(existing);
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ModelStore.PurgeDeletable(s => s.ID == existing.ID);
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}
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PreImport(item);
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// import to store
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ModelStore.Add(item);
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}
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catch (Exception e)
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{
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write.Errors.Add(e);
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throw;
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}
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}
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LogForModel(item, @"Import successfully completed!");
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}
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catch (Exception e)
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{
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if (!(e is TaskCanceledException))
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LogForModel(item, @"Database import or population failed and has been rolled back.", e);
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rollback();
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flushEvents(false);
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throw;
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}
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flushEvents(true);
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return item.ToEntityFrameworkLive();
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}, cancellationToken, TaskCreationOptions.HideScheduler, lowPriority ? import_scheduler_low_priority : import_scheduler).Unwrap().ConfigureAwait(false);
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/// <summary>
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/// Exports an item to a legacy (.zip based) package.
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/// </summary>
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||
/// <param name="item">The item to export.</param>
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public void Export(TModel item)
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{
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var retrievedItem = ModelStore.ConsumableItems.FirstOrDefault(s => s.ID == item.ID);
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if (retrievedItem == null)
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throw new ArgumentException(@"Specified model could not be found", nameof(item));
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string filename = $"{GetValidFilename(item.ToString())}{HandledExtensions.First()}";
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using (var stream = exportStorage.GetStream(filename, FileAccess.Write, FileMode.Create))
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ExportModelTo(retrievedItem, stream);
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exportStorage.PresentFileExternally(filename);
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}
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/// <summary>
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/// Exports an item to the given output stream.
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/// </summary>
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/// <param name="model">The item to export.</param>
|
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/// <param name="outputStream">The output stream to export to.</param>
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public virtual void ExportModelTo(TModel model, Stream outputStream)
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{
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using (var archive = ZipArchive.Create())
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{
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foreach (var file in model.Files)
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archive.AddEntry(file.Filename, Files.Storage.GetStream(file.FileInfo.GetStoragePath()));
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archive.SaveTo(outputStream);
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}
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}
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/// <summary>
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/// Replace an existing file with a new version.
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||
/// </summary>
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/// <param name="model">The item to operate on.</param>
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/// <param name="file">The existing file to be replaced.</param>
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/// <param name="contents">The new file contents.</param>
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/// <param name="filename">An optional filename for the new file. Will use the previous filename if not specified.</param>
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public void ReplaceFile(TModel model, TFileModel file, Stream contents, string filename = null)
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{
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using (ContextFactory.GetForWrite())
|
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{
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DeleteFile(model, file);
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AddFile(model, contents, filename ?? file.Filename);
|
||
}
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||
}
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/// <summary>
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/// Delete an existing file.
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||
/// </summary>
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||
/// <param name="model">The item to operate on.</param>
|
||
/// <param name="file">The existing file to be deleted.</param>
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||
public void DeleteFile(TModel model, TFileModel file)
|
||
{
|
||
using (var usage = ContextFactory.GetForWrite())
|
||
{
|
||
// Dereference the existing file info, since the file model will be removed.
|
||
if (file.FileInfo != null)
|
||
{
|
||
Files.Dereference(file.FileInfo);
|
||
|
||
if (file.ID > 0)
|
||
{
|
||
// This shouldn't be required, but here for safety in case the provided TModel is not being change tracked
|
||
// Definitely can be removed once we rework the database backend.
|
||
usage.Context.Set<TFileModel>().Remove(file);
|
||
}
|
||
}
|
||
|
||
model.Files.Remove(file);
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// Add a new file.
|
||
/// </summary>
|
||
/// <param name="model">The item to operate on.</param>
|
||
/// <param name="contents">The new file contents.</param>
|
||
/// <param name="filename">The filename for the new file.</param>
|
||
public void AddFile(TModel model, Stream contents, string filename)
|
||
{
|
||
using (ContextFactory.GetForWrite())
|
||
{
|
||
model.Files.Add(new TFileModel
|
||
{
|
||
Filename = filename,
|
||
FileInfo = Files.Add(contents)
|
||
});
|
||
}
|
||
|
||
if (model.ID > 0)
|
||
Update(model);
|
||
}
|
||
|
||
/// <summary>
|
||
/// Perform an update of the specified item.
|
||
/// TODO: Support file additions/removals.
|
||
/// </summary>
|
||
/// <param name="item">The item to update.</param>
|
||
public void Update(TModel item)
|
||
{
|
||
using (ContextFactory.GetForWrite())
|
||
{
|
||
item.Hash = ComputeHash(item);
|
||
ModelStore.Update(item);
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// Delete an item from the manager.
|
||
/// Is a no-op for already deleted items.
|
||
/// </summary>
|
||
/// <param name="item">The item to delete.</param>
|
||
/// <returns>false if no operation was performed</returns>
|
||
public bool Delete(TModel item)
|
||
{
|
||
using (ContextFactory.GetForWrite())
|
||
{
|
||
// re-fetch the model on the import context.
|
||
var foundModel = queryModel().Include(s => s.Files).ThenInclude(f => f.FileInfo).FirstOrDefault(s => s.ID == item.ID);
|
||
|
||
if (foundModel == null || foundModel.DeletePending) return false;
|
||
|
||
if (ModelStore.Delete(foundModel))
|
||
Files.Dereference(foundModel.Files.Select(f => f.FileInfo).ToArray());
|
||
return true;
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// Delete multiple items.
|
||
/// This will post notifications tracking progress.
|
||
/// </summary>
|
||
public void Delete(List<TModel> items, bool silent = false)
|
||
{
|
||
if (items.Count == 0) return;
|
||
|
||
var notification = new ProgressNotification
|
||
{
|
||
Progress = 0,
|
||
Text = $"Preparing to delete all {HumanisedModelName}s...",
|
||
CompletionText = $"Deleted all {HumanisedModelName}s!",
|
||
State = ProgressNotificationState.Active,
|
||
};
|
||
|
||
if (!silent)
|
||
PostNotification?.Invoke(notification);
|
||
|
||
int i = 0;
|
||
|
||
foreach (var b in items)
|
||
{
|
||
if (notification.State == ProgressNotificationState.Cancelled)
|
||
// user requested abort
|
||
return;
|
||
|
||
notification.Text = $"Deleting {HumanisedModelName}s ({++i} of {items.Count})";
|
||
|
||
Delete(b);
|
||
|
||
notification.Progress = (float)i / items.Count;
|
||
}
|
||
|
||
notification.State = ProgressNotificationState.Completed;
|
||
}
|
||
|
||
/// <summary>
|
||
/// Restore multiple items that were previously deleted.
|
||
/// This will post notifications tracking progress.
|
||
/// </summary>
|
||
public void Undelete(List<TModel> items, bool silent = false)
|
||
{
|
||
if (!items.Any()) return;
|
||
|
||
var notification = new ProgressNotification
|
||
{
|
||
CompletionText = "Restored all deleted items!",
|
||
Progress = 0,
|
||
State = ProgressNotificationState.Active,
|
||
};
|
||
|
||
if (!silent)
|
||
PostNotification?.Invoke(notification);
|
||
|
||
int i = 0;
|
||
|
||
foreach (var item in items)
|
||
{
|
||
if (notification.State == ProgressNotificationState.Cancelled)
|
||
// user requested abort
|
||
return;
|
||
|
||
notification.Text = $"Restoring ({++i} of {items.Count})";
|
||
|
||
Undelete(item);
|
||
|
||
notification.Progress = (float)i / items.Count;
|
||
}
|
||
|
||
notification.State = ProgressNotificationState.Completed;
|
||
}
|
||
|
||
/// <summary>
|
||
/// Restore an item that was previously deleted. Is a no-op if the item is not in a deleted state, or has its protected flag set.
|
||
/// </summary>
|
||
/// <param name="item">The item to restore</param>
|
||
public void Undelete(TModel item)
|
||
{
|
||
using (var usage = ContextFactory.GetForWrite())
|
||
{
|
||
usage.Context.ChangeTracker.AutoDetectChangesEnabled = false;
|
||
|
||
if (!ModelStore.Undelete(item)) return;
|
||
|
||
Files.Reference(item.Files.Select(f => f.FileInfo).ToArray());
|
||
|
||
usage.Context.ChangeTracker.AutoDetectChangesEnabled = true;
|
||
}
|
||
}
|
||
|
||
private string computeHashFast(ArchiveReader reader)
|
||
{
|
||
MemoryStream hashable = new MemoryStream();
|
||
|
||
foreach (string file in reader.Filenames.Where(f => HashableFileTypes.Any(ext => f.EndsWith(ext, StringComparison.OrdinalIgnoreCase))).OrderBy(f => f))
|
||
{
|
||
using (Stream s = reader.GetStream(file))
|
||
s.CopyTo(hashable);
|
||
}
|
||
|
||
if (hashable.Length > 0)
|
||
return hashable.ComputeSHA2Hash();
|
||
|
||
return generateFallbackHash();
|
||
}
|
||
|
||
/// <summary>
|
||
/// Create all required <see cref="IO.FileInfo"/>s for the provided archive, adding them to the global file store.
|
||
/// </summary>
|
||
private List<TFileModel> createFileInfos(ArchiveReader reader, FileStore files)
|
||
{
|
||
var fileInfos = new List<TFileModel>();
|
||
|
||
// import files to manager
|
||
foreach (var filenames in getShortenedFilenames(reader))
|
||
{
|
||
using (Stream s = reader.GetStream(filenames.original))
|
||
{
|
||
fileInfos.Add(new TFileModel
|
||
{
|
||
Filename = filenames.shortened,
|
||
FileInfo = files.Add(s)
|
||
});
|
||
}
|
||
}
|
||
|
||
return fileInfos;
|
||
}
|
||
|
||
private IEnumerable<(string original, string shortened)> getShortenedFilenames(ArchiveReader reader)
|
||
{
|
||
string prefix = reader.Filenames.GetCommonPrefix();
|
||
if (!(prefix.EndsWith('/') || prefix.EndsWith('\\')))
|
||
prefix = string.Empty;
|
||
|
||
// import files to manager
|
||
foreach (string file in reader.Filenames)
|
||
yield return (file, file.Substring(prefix.Length).ToStandardisedPath());
|
||
}
|
||
|
||
#region osu-stable import
|
||
|
||
/// <summary>
|
||
/// The relative path from osu-stable's data directory to import items from.
|
||
/// </summary>
|
||
protected virtual string ImportFromStablePath => null;
|
||
|
||
/// <summary>
|
||
/// Select paths to import from stable where all paths should be absolute. Default implementation iterates all directories in <see cref="ImportFromStablePath"/>.
|
||
/// </summary>
|
||
protected virtual IEnumerable<string> GetStableImportPaths(Storage storage) => storage.GetDirectories(ImportFromStablePath)
|
||
.Select(path => storage.GetFullPath(path));
|
||
|
||
/// <summary>
|
||
/// Whether this specified path should be removed after successful import.
|
||
/// </summary>
|
||
/// <param name="path">The path for consideration. May be a file or a directory.</param>
|
||
/// <returns>Whether to perform deletion.</returns>
|
||
protected virtual bool ShouldDeleteArchive(string path) => false;
|
||
|
||
public Task ImportFromStableAsync(StableStorage stableStorage)
|
||
{
|
||
var storage = PrepareStableStorage(stableStorage);
|
||
|
||
// Handle situations like when the user does not have a Skins folder.
|
||
if (!storage.ExistsDirectory(ImportFromStablePath))
|
||
{
|
||
string fullPath = storage.GetFullPath(ImportFromStablePath);
|
||
|
||
Logger.Log(@$"Folder ""{fullPath}"" not available in the target osu!stable installation to import {HumanisedModelName}s.", LoggingTarget.Information, LogLevel.Error);
|
||
return Task.CompletedTask;
|
||
}
|
||
|
||
return Task.Run(async () => await Import(GetStableImportPaths(storage).ToArray()).ConfigureAwait(false));
|
||
}
|
||
|
||
/// <summary>
|
||
/// Run any required traversal operations on the stable storage location before performing operations.
|
||
/// </summary>
|
||
/// <param name="stableStorage">The stable storage.</param>
|
||
/// <returns>The usable storage. Return the unchanged <paramref name="stableStorage"/> if no traversal is required.</returns>
|
||
protected virtual Storage PrepareStableStorage(StableStorage stableStorage) => stableStorage;
|
||
|
||
#endregion
|
||
|
||
/// <summary>
|
||
/// Create a barebones model from the provided archive.
|
||
/// Actual expensive population should be done in <see cref="Populate"/>; this should just prepare for duplicate checking.
|
||
/// </summary>
|
||
/// <param name="archive">The archive to create the model for.</param>
|
||
/// <returns>A model populated with minimal information. Returning a null will abort importing silently.</returns>
|
||
protected abstract TModel CreateModel(ArchiveReader archive);
|
||
|
||
/// <summary>
|
||
/// Populate the provided model completely from the given archive.
|
||
/// After this method, the model should be in a state ready to commit to a store.
|
||
/// </summary>
|
||
/// <param name="model">The model to populate.</param>
|
||
/// <param name="archive">The archive to use as a reference for population. May be null.</param>
|
||
/// <param name="cancellationToken">An optional cancellation token.</param>
|
||
protected abstract Task Populate(TModel model, [CanBeNull] ArchiveReader archive, CancellationToken cancellationToken = default);
|
||
|
||
/// <summary>
|
||
/// Perform any final actions before the import to database executes.
|
||
/// </summary>
|
||
/// <param name="model">The model prepared for import.</param>
|
||
protected virtual void PreImport(TModel model)
|
||
{
|
||
}
|
||
|
||
/// <summary>
|
||
/// Check whether an existing model already exists for a new import item.
|
||
/// </summary>
|
||
/// <param name="model">The new model proposed for import.</param>
|
||
/// <returns>An existing model which matches the criteria to skip importing, else null.</returns>
|
||
protected TModel CheckForExisting(TModel model) => model.Hash == null ? null : ModelStore.ConsumableItems.FirstOrDefault(b => b.Hash == model.Hash);
|
||
|
||
public bool IsAvailableLocally(TModel model) => CheckLocalAvailability(model, ModelStore.ConsumableItems.Where(m => !m.DeletePending));
|
||
|
||
/// <summary>
|
||
/// Performs implementation specific comparisons to determine whether a given model is present in the local store.
|
||
/// </summary>
|
||
/// <param name="model">The <typeparamref name="TModel"/> whose existence needs to be checked.</param>
|
||
/// <param name="items">The usable items present in the store.</param>
|
||
/// <returns>Whether the <typeparamref name="TModel"/> exists.</returns>
|
||
protected virtual bool CheckLocalAvailability(TModel model, IQueryable<TModel> items)
|
||
=> model.ID > 0 && items.Any(i => i.ID == model.ID && i.Files.Any());
|
||
|
||
/// <summary>
|
||
/// Whether import can be skipped after finding an existing import early in the process.
|
||
/// Only valid when <see cref="ComputeHash"/> is not overridden.
|
||
/// </summary>
|
||
/// <param name="existing">The existing model.</param>
|
||
/// <param name="import">The newly imported model.</param>
|
||
/// <returns>Whether to skip this import completely.</returns>
|
||
protected virtual bool CanSkipImport(TModel existing, TModel import) => true;
|
||
|
||
/// <summary>
|
||
/// After an existing <typeparamref name="TModel"/> is found during an import process, the default behaviour is to use/restore the existing
|
||
/// item and skip the import. This method allows changing that behaviour.
|
||
/// </summary>
|
||
/// <param name="existing">The existing model.</param>
|
||
/// <param name="import">The newly imported model.</param>
|
||
/// <returns>Whether the existing model should be restored and used. Returning false will delete the existing and force a re-import.</returns>
|
||
protected virtual bool CanReuseExisting(TModel existing, TModel import) =>
|
||
// for the best or worst, we copy and import files of a new import before checking whether
|
||
// it is a duplicate. so to check if anything has changed, we can just compare all FileInfo IDs.
|
||
getIDs(existing.Files).SequenceEqual(getIDs(import.Files)) &&
|
||
getFilenames(existing.Files).SequenceEqual(getFilenames(import.Files));
|
||
|
||
private IEnumerable<long> getIDs(List<TFileModel> files)
|
||
{
|
||
foreach (var f in files.OrderBy(f => f.Filename))
|
||
yield return f.FileInfo.ID;
|
||
}
|
||
|
||
private IEnumerable<string> getFilenames(List<TFileModel> files)
|
||
{
|
||
foreach (var f in files.OrderBy(f => f.Filename))
|
||
yield return f.Filename;
|
||
}
|
||
|
||
private DbSet<TModel> queryModel() => ContextFactory.Get().Set<TModel>();
|
||
|
||
public virtual string HumanisedModelName => $"{typeof(TModel).Name.Replace(@"Info", "").ToLower()}";
|
||
|
||
#region Event handling / delaying
|
||
|
||
private readonly List<Action> queuedEvents = new List<Action>();
|
||
|
||
/// <summary>
|
||
/// Allows delaying of outwards events until an operation is confirmed (at a database level).
|
||
/// </summary>
|
||
private bool delayingEvents;
|
||
|
||
/// <summary>
|
||
/// Begin delaying outwards events.
|
||
/// </summary>
|
||
private void delayEvents() => delayingEvents = true;
|
||
|
||
/// <summary>
|
||
/// Flush delayed events and disable delaying.
|
||
/// </summary>
|
||
/// <param name="perform">Whether the flushed events should be performed.</param>
|
||
private void flushEvents(bool perform)
|
||
{
|
||
Action[] events;
|
||
|
||
lock (queuedEvents)
|
||
{
|
||
events = queuedEvents.ToArray();
|
||
queuedEvents.Clear();
|
||
}
|
||
|
||
if (perform)
|
||
{
|
||
foreach (var a in events)
|
||
a.Invoke();
|
||
}
|
||
|
||
delayingEvents = false;
|
||
}
|
||
|
||
private void handleEvent(Action a)
|
||
{
|
||
if (delayingEvents)
|
||
{
|
||
lock (queuedEvents)
|
||
queuedEvents.Add(a);
|
||
}
|
||
else
|
||
a.Invoke();
|
||
}
|
||
|
||
#endregion
|
||
|
||
private static string generateFallbackHash()
|
||
{
|
||
// if a hash could no be generated from file content, presume a unique / new import.
|
||
// therefore, let's use a guaranteed unique hash.
|
||
// this doesn't follow the SHA2 hashing schema intentionally, so such entries on the data store can be identified.
|
||
return Guid.NewGuid().ToString();
|
||
}
|
||
|
||
private readonly char[] invalidFilenameCharacters = Path.GetInvalidFileNameChars()
|
||
// Backslash is added to avoid issues when exporting to zip.
|
||
// See SharpCompress filename normalisation https://github.com/adamhathcock/sharpcompress/blob/a1e7c0068db814c9aa78d86a94ccd1c761af74bd/src/SharpCompress/Writers/Zip/ZipWriter.cs#L143.
|
||
.Append('\\')
|
||
.ToArray();
|
||
|
||
protected string GetValidFilename(string filename)
|
||
{
|
||
foreach (char c in invalidFilenameCharacters)
|
||
filename = filename.Replace(c, '_');
|
||
return filename;
|
||
}
|
||
}
|
||
}
|