osu/osu.Game/IO/FileStore.cs

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// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System;
using System.IO;
using System.Linq;
using osu.Framework.Extensions;
using osu.Framework.IO.Stores;
using osu.Framework.Logging;
using osu.Framework.Platform;
using osu.Game.Database;
namespace osu.Game.IO
{
/// <summary>
/// Handles the Store and retrieval of Files/FileSets to the database backing
/// </summary>
public class FileStore : DatabaseBackedStore
{
public readonly IResourceStore<byte[]> Store;
public new Storage Storage => base.Storage;
public FileStore(Func<OsuDbContext> createContext, Storage storage) : base(createContext, storage.GetStorageForDirectory(@"files"))
{
Store = new StorageBackedResourceStore(Storage);
}
public FileInfo Add(Stream data, bool reference = true)
{
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var context = GetContext();
string hash = data.ComputeSHA2Hash();
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var existing = context.FileInfo.FirstOrDefault(f => f.Hash == hash);
var info = existing ?? new FileInfo { Hash = hash };
string path = info.StoragePath;
// we may be re-adding a file to fix missing store entries.
if (!Storage.Exists(path))
{
data.Seek(0, SeekOrigin.Begin);
using (var output = Storage.GetStream(path, FileAccess.Write))
data.CopyTo(output);
data.Seek(0, SeekOrigin.Begin);
}
if (reference || existing == null)
Reference(info);
return info;
}
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public void Reference(params FileInfo[] files) => reference(GetContext(), files);
private void reference(OsuDbContext context, FileInfo[] files)
{
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foreach (var f in files.GroupBy(f => f.ID))
{
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var refetch = context.Find<FileInfo>(f.First().ID) ?? f.First();
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refetch.ReferenceCount += f.Count();
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context.FileInfo.Update(refetch);
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}
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context.SaveChanges();
}
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public void Dereference(params FileInfo[] files) => dereference(GetContext(), files);
private void dereference(OsuDbContext context, FileInfo[] files)
{
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foreach (var f in files.GroupBy(f => f.ID))
{
var refetch = context.FileInfo.Find(f.Key);
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refetch.ReferenceCount -= f.Count();
context.FileInfo.Update(refetch);
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}
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context.SaveChanges();
}
public override void Cleanup()
{
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var context = GetContext();
foreach (var f in context.FileInfo.Where(f => f.ReferenceCount < 1))
{
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try
{
Storage.Delete(f.StoragePath);
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context.FileInfo.Remove(f);
}
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catch (Exception e)
{
Logger.Error(e, $@"Could not delete beatmap {f}");
}
}
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context.SaveChanges();
}
}
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}