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osu-lazer/osu.Game/Rulesets/RulesetStore.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;
using System.IO;
using System.Linq;
using System.Reflection;
using osu.Framework.Logging;
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using osu.Game.Database;
namespace osu.Game.Rulesets
{
public class RulesetStore : DatabaseBackedStore, IDisposable
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{
private const string ruleset_library_prefix = "osu.Game.Rulesets";
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private readonly Dictionary<Assembly, Type> loadedAssemblies = new Dictionary<Assembly, Type>();
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public RulesetStore(IDatabaseContextFactory factory)
: base(factory)
{
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// On android in release configuration assemblies are loaded from the apk directly into memory.
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// We cannot read assemblies from cwd, so should check loaded assemblies instead.
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loadFromAppDomain();
loadFromDisk();
addMissingRulesets();
AppDomain.CurrentDomain.AssemblyResolve += resolveRulesetAssembly;
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}
/// <summary>
/// Retrieve a ruleset using a known ID.
/// </summary>
/// <param name="id">The ruleset's internal ID.</param>
/// <returns>A ruleset, if available, else null.</returns>
public RulesetInfo GetRuleset(int id) => AvailableRulesets.FirstOrDefault(r => r.ID == id);
/// <summary>
/// Retrieve a ruleset using a known short name.
/// </summary>
/// <param name="shortName">The ruleset's short name.</param>
/// <returns>A ruleset, if available, else null.</returns>
public RulesetInfo GetRuleset(string shortName) => AvailableRulesets.FirstOrDefault(r => r.ShortName == shortName);
/// <summary>
/// All available rulesets.
/// </summary>
public IEnumerable<RulesetInfo> AvailableRulesets { get; private set; }
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private Assembly resolveRulesetAssembly(object sender, ResolveEventArgs args) => loadedAssemblies.Keys.FirstOrDefault(a => a.FullName == args.Name);
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private void addMissingRulesets()
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{
using (var usage = ContextFactory.GetForWrite())
{
var context = usage.Context;
var instances = loadedAssemblies.Values.Select(r => (Ruleset)Activator.CreateInstance(r, (RulesetInfo)null)).ToList();
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//add all legacy modes in correct order
foreach (var r in instances.Where(r => r.LegacyID != null).OrderBy(r => r.LegacyID))
{
if (context.RulesetInfo.SingleOrDefault(rsi => rsi.ID == r.RulesetInfo.ID) == null)
context.RulesetInfo.Add(r.RulesetInfo);
}
context.SaveChanges();
//add any other modes
foreach (var r in instances.Where(r => r.LegacyID == null))
if (context.RulesetInfo.FirstOrDefault(ri => ri.InstantiationInfo == r.RulesetInfo.InstantiationInfo) == null)
context.RulesetInfo.Add(r.RulesetInfo);
context.SaveChanges();
//perform a consistency check
foreach (var r in context.RulesetInfo)
{
try
{
var instanceInfo = ((Ruleset)Activator.CreateInstance(Type.GetType(r.InstantiationInfo, asm =>
{
// for the time being, let's ignore the version being loaded.
// this allows for debug builds to successfully load rulesets (even though debug rulesets have a 0.0.0 version).
asm.Version = null;
return Assembly.Load(asm);
}, null), (RulesetInfo)null)).RulesetInfo;
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r.Name = instanceInfo.Name;
r.ShortName = instanceInfo.ShortName;
r.InstantiationInfo = instanceInfo.InstantiationInfo;
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r.Available = true;
}
catch
{
r.Available = false;
}
}
context.SaveChanges();
AvailableRulesets = context.RulesetInfo.Where(r => r.Available).ToList();
}
}
private void loadFromAppDomain()
{
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foreach (var ruleset in AppDomain.CurrentDomain.GetAssemblies())
{
string rulesetName = ruleset.GetName().Name;
if (!rulesetName.StartsWith(ruleset_library_prefix, StringComparison.InvariantCultureIgnoreCase) || ruleset.GetName().Name.Contains("Tests"))
continue;
addRuleset(ruleset);
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}
}
private void loadFromDisk()
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{
try
{
string[] files = Directory.GetFiles(Environment.CurrentDirectory, $"{ruleset_library_prefix}.*.dll");
foreach (string file in files.Where(f => !Path.GetFileName(f).Contains("Tests")))
loadRulesetFromFile(file);
}
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catch (Exception e)
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{
Logger.Error(e, $"Could not load rulesets from directory {Environment.CurrentDirectory}");
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}
}
private void loadRulesetFromFile(string file)
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{
var filename = Path.GetFileNameWithoutExtension(file);
if (loadedAssemblies.Values.Any(t => t.Namespace == filename))
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return;
try
{
addRuleset(Assembly.LoadFrom(file));
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}
catch (Exception e)
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{
Logger.Error(e, $"Failed to load ruleset {filename}");
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}
}
private void addRuleset(Assembly assembly)
{
if (loadedAssemblies.ContainsKey(assembly))
return;
try
{
loadedAssemblies[assembly] = assembly.GetTypes().First(t => t.IsPublic && t.IsSubclassOf(typeof(Ruleset)));
}
catch (Exception e)
{
Logger.Error(e, $"Failed to add ruleset {assembly}");
}
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
AppDomain.CurrentDomain.AssemblyResolve -= resolveRulesetAssembly;
}
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}
}