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.
using System;
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using System.Diagnostics;
using System.IO;
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using System.Linq;
using System.Threading;
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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 : WrappedStorage
{
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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;
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public static readonly string[] IGNORE_DIRECTORIES = { "cache" };
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public static readonly string[] IGNORE_FILES =
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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);
if (!userStorage.GetFiles(".").Any())
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 void Migrate(string newLocation)
{
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var source = new DirectoryInfo(GetFullPath("."));
var destination = new DirectoryInfo(newLocation);
// using Uri is the easiest way to check equality and contains (https://stackoverflow.com/a/7710620)
var sourceUri = new Uri(source.FullName + Path.DirectorySeparatorChar);
var destinationUri = new Uri(destination.FullName + Path.DirectorySeparatorChar);
if (sourceUri == destinationUri)
throw new ArgumentException("Destination provided is already the current location", nameof(newLocation));
if (sourceUri.IsBaseOf(destinationUri))
throw new ArgumentException("Destination provided is inside the source", nameof(newLocation));
// ensure the new location has no files present, else hard abort
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if (destination.Exists)
{
if (destination.GetFiles().Length > 0 || destination.GetDirectories().Length > 0)
throw new ArgumentException("Destination provided already has files or directories present", nameof(newLocation));
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deleteRecursive(destination);
}
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copyRecursive(source, destination);
ChangeTargetStorage(host.GetStorage(newLocation));
storageConfig.Set(StorageConfig.FullPath, newLocation);
storageConfig.Save();
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deleteRecursive(source);
}
private static void deleteRecursive(DirectoryInfo target, bool topLevelExcludes = true)
{
foreach (System.IO.FileInfo fi in target.GetFiles())
{
if (topLevelExcludes && IGNORE_FILES.Contains(fi.Name))
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continue;
attemptOperation(() => fi.Delete());
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}
foreach (DirectoryInfo dir in target.GetDirectories())
{
if (topLevelExcludes && IGNORE_DIRECTORIES.Contains(dir.Name))
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continue;
attemptOperation(() => dir.Delete(true));
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}
if (target.GetFiles().Length == 0 && target.GetDirectories().Length == 0)
attemptOperation(target.Delete);
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}
private static void copyRecursive(DirectoryInfo source, DirectoryInfo destination, bool topLevelExcludes = true)
{
// based off example code https://docs.microsoft.com/en-us/dotnet/api/system.io.directoryinfo
Directory.CreateDirectory(destination.FullName);
foreach (System.IO.FileInfo fi in source.GetFiles())
{
if (topLevelExcludes && IGNORE_FILES.Contains(fi.Name))
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continue;
attemptOperation(() => fi.CopyTo(Path.Combine(destination.FullName, fi.Name), true));
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}
foreach (DirectoryInfo dir in source.GetDirectories())
{
if (topLevelExcludes && IGNORE_DIRECTORIES.Contains(dir.Name))
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continue;
copyRecursive(dir, destination.CreateSubdirectory(dir.Name), false);
}
}
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/// <summary>
/// Attempt an IO operation multiple times and only throw if none of the attempts succeed.
/// </summary>
/// <param name="action">The action to perform.</param>
/// <param name="attempts">The number of attempts (250ms wait between each).</param>
private static void attemptOperation(Action action, int attempts = 10)
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{
while (true)
{
try
{
action();
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return;
}
catch (Exception)
{
if (attempts-- == 0)
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throw;
}
Thread.Sleep(250);
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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,
}
}