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Check filenames and timestamps before reusing an already imported model

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This commit is contained in:
Dean Herbert
2020-06-03 18:03:10 +09:00
parent 73467410ab
commit c155ab8339
2 changed files with 21 additions and 5 deletions
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22
osu.Game/Database/ArchiveModelManager.cs
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@ -332,7 +332,7 @@ namespace osu.Game.Database
if (existing != null)
{
if (CanUndelete(existing, item))
if (CanReuseExisting(existing, item))
{
Undelete(existing);
LogForModel(item, $"Found existing {HumanisedModelName} for {item} (ID {existing.ID}) – skipping import.");
@ -660,13 +660,29 @@ namespace osu.Game.Database
protected TModel CheckForExisting(TModel model) => model.Hash == null ? null : ModelStore.ConsumableItems.FirstOrDefault(b => b.Hash == model.Hash);
/// <summary>
/// After an existing <typeparamref name="TModel"/> is found during an import process, the default behaviour is to restore the existing
/// 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 CanUndelete(TModel existing, TModel import) => true;
protected virtual bool CanReuseExisting(TModel existing, TModel import) =>
getFilenames(existing.Files).SequenceEqual(getFilenames(import.Files)) &&
// poor-man's (cheap) equality comparison, avoiding hashing unnecessarily.
// can switch to full hash checks on a per-case basis (or for all) if we decide this is not a performance issue.
getTimestamps(existing.Files).SequenceEqual(getTimestamps(import.Files));
private IEnumerable<string> getFilenames(List<TFileModel> files)
{
foreach (var f in files.OrderBy(f => f.Filename))
yield return f.Filename;
}
private IEnumerable<long> getTimestamps(List<TFileModel> files)
{
foreach (var f in files.OrderBy(f => f.Filename))
yield return File.GetLastWriteTimeUtc(Files.Storage.GetFullPath(f.FileInfo.StoragePath)).ToFileTime();
}
private DbSet<TModel> queryModel() => ContextFactory.Get().Set<TModel>();