osu/osu.Game/IO/FileStore.cs

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// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
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using System;
using System.Collections.Generic;
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using System.IO;
using System.Linq;
using System.Linq.Expressions;
using Microsoft.EntityFrameworkCore;
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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;
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public FileStore(IDatabaseContextFactory contextFactory, Storage storage)
: base(contextFactory, storage.GetStorageForDirectory(@"files"))
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{
Store = new StorageBackedResourceStore(Storage);
}
/// <summary>
/// Perform a lookup query on available <see cref="FileInfo"/>s.
/// </summary>
/// <param name="query">The query.</param>
/// <returns>Results from the provided query.</returns>
public IEnumerable<FileInfo> QueryFiles(Expression<Func<FileInfo, bool>> query) => ContextFactory.Get().Set<FileInfo>().AsNoTracking().Where(f => f.ReferenceCount > 0).Where(query);
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public FileInfo Add(Stream data, bool reference = true)
{
using (var usage = ContextFactory.GetForWrite())
{
string hash = data.ComputeSHA2Hash();
var existing = usage.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.
bool requiresCopy = !Storage.Exists(path);
if (!requiresCopy)
{
// even if the file already exists, check the existing checksum for safety.
using (var stream = Storage.GetStream(path))
requiresCopy |= stream.ComputeSHA2Hash() != hash;
}
if (requiresCopy)
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{
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;
}
}
public void Reference(params FileInfo[] files)
{
if (files.Length == 0) return;
using (var usage = ContextFactory.GetForWrite())
{
var context = usage.Context;
foreach (var f in files.GroupBy(f => f.ID))
{
var refetch = context.Find<FileInfo>(f.First().ID) ?? f.First();
refetch.ReferenceCount += f.Count();
context.FileInfo.Update(refetch);
}
}
}
public void Dereference(params FileInfo[] files)
{
if (files.Length == 0) return;
using (var usage = ContextFactory.GetForWrite())
{
var context = usage.Context;
foreach (var f in files.GroupBy(f => f.ID))
{
var refetch = context.FileInfo.Find(f.Key);
refetch.ReferenceCount -= f.Count();
context.FileInfo.Update(refetch);
}
}
}
public override void Cleanup()
{
using (var usage = ContextFactory.GetForWrite())
{
var context = usage.Context;
foreach (var f in context.FileInfo.Where(f => f.ReferenceCount < 1))
{
try
{
Storage.Delete(f.StoragePath);
context.FileInfo.Remove(f);
}
catch (Exception e)
{
Logger.Error(e, $@"Could not delete beatmap {f}");
}
}
}
}
}
}