osu/osu.Game/Rulesets/RulesetStore.cs

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// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
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
{
/// <summary>
/// Todo: All of this needs to be moved to a RulesetStore.
/// </summary>
public class RulesetStore : DatabaseBackedStore
{
private static readonly Dictionary<Assembly, Type> loaded_assemblies = new Dictionary<Assembly, Type>();
static RulesetStore()
{
AppDomain.CurrentDomain.AssemblyResolve += currentDomain_AssemblyResolve;
foreach (string file in Directory.GetFiles(Environment.CurrentDirectory, $"{ruleset_library_prefix}.*.dll"))
loadRulesetFromFile(file);
}
public RulesetStore(IDatabaseContextFactory factory)
: base(factory)
{
AddMissingRulesets();
}
/// <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;
private static Assembly currentDomain_AssemblyResolve(object sender, ResolveEventArgs args) => loaded_assemblies.Keys.FirstOrDefault(a => a.FullName == args.Name);
private const string ruleset_library_prefix = "osu.Game.Rulesets";
protected void AddMissingRulesets()
{
using (var usage = ContextFactory.GetForWrite())
{
var context = usage.Context;
var instances = loaded_assemblies.Values.Select(r => (Ruleset)Activator.CreateInstance(r, (RulesetInfo)null)).ToList();
//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 static void loadRulesetFromFile(string file)
{
var filename = Path.GetFileNameWithoutExtension(file);
if (loaded_assemblies.Values.Any(t => t.Namespace == filename))
return;
try
{
var assembly = Assembly.LoadFrom(file);
loaded_assemblies[assembly] = assembly.GetTypes().First(t => t.IsPublic && t.IsSubclassOf(typeof(Ruleset)));
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}
catch (Exception e)
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{
Logger.Error(e, "Failed to load ruleset");
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}
}
}
}