osu/osu.Game/IO/OsuStorage.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.Diagnostics;
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using System.Linq;
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using JetBrains.Annotations;
using osu.Framework.Logging;
using osu.Framework.Platform;
using osu.Game.Configuration;
namespace osu.Game.IO
{
public class OsuStorage : MigratableStorage
{
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/// <summary>
/// Indicates the error (if any) that occurred when initialising the custom storage during initial startup.
/// </summary>
public readonly OsuStorageError Error;
/// <summary>
/// The custom storage path as selected by the user.
/// </summary>
[CanBeNull]
public string CustomStoragePath => storageConfig.Get<string>(StorageConfig.FullPath);
/// <summary>
/// The default storage path to be used if a custom storage path hasn't been selected or is not accessible.
/// </summary>
[NotNull]
public string DefaultStoragePath => defaultStorage.GetFullPath(".");
private readonly GameHost host;
private readonly StorageConfigManager storageConfig;
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private readonly Storage defaultStorage;
public override string[] IgnoreDirectories => new[] { "cache" };
public override string[] IgnoreFiles => new[]
{
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"framework.ini",
"storage.ini"
};
public OsuStorage(GameHost host, Storage defaultStorage)
: base(defaultStorage, string.Empty)
{
this.host = host;
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this.defaultStorage = defaultStorage;
storageConfig = new StorageConfigManager(defaultStorage);
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if (!string.IsNullOrEmpty(CustomStoragePath))
TryChangeToCustomStorage(out Error);
}
/// <summary>
/// Resets the custom storage path, changing the target storage to the default location.
/// </summary>
public void ResetCustomStoragePath()
{
storageConfig.Set(StorageConfig.FullPath, string.Empty);
storageConfig.Save();
ChangeTargetStorage(defaultStorage);
}
/// <summary>
/// Attempts to change to the user's custom storage path.
/// </summary>
/// <param name="error">The error that occurred.</param>
/// <returns>Whether the custom storage path was used successfully. If not, <paramref name="error"/> will be populated with the reason.</returns>
public bool TryChangeToCustomStorage(out OsuStorageError error)
{
Debug.Assert(!string.IsNullOrEmpty(CustomStoragePath));
error = OsuStorageError.None;
Storage lastStorage = UnderlyingStorage;
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try
{
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Storage userStorage = host.GetStorage(CustomStoragePath);
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if (!userStorage.ExistsDirectory(".") || !userStorage.GetFiles(".").Any())
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error = OsuStorageError.AccessibleButEmpty;
ChangeTargetStorage(userStorage);
}
catch
{
error = OsuStorageError.NotAccessible;
ChangeTargetStorage(lastStorage);
}
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return error == OsuStorageError.None;
}
protected override void ChangeTargetStorage(Storage newStorage)
{
base.ChangeTargetStorage(newStorage);
Logger.Storage = UnderlyingStorage.GetStorageForDirectory("logs");
}
public override void Migrate(Storage newStorage)
{
base.Migrate(newStorage);
storageConfig.Set(StorageConfig.FullPath, newStorage.GetFullPath("."));
storageConfig.Save();
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}
}
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public enum OsuStorageError
{
/// <summary>
/// No error.
/// </summary>
None,
/// <summary>
/// Occurs when the target storage directory is accessible but does not already contain game files.
/// Only happens when the user changes the storage directory and then moves the files manually or mounts a different device to the same path.
/// </summary>
AccessibleButEmpty,
/// <summary>
/// Occurs when the target storage directory cannot be accessed at all.
/// </summary>
NotAccessible,
}
}