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189 lines
9.3 KiB
189 lines
9.3 KiB
using IPA.Logging;
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using IPA.Utilities;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Linq.Expressions;
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#if NET4
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using Task = System.Threading.Tasks.Task;
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#endif
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#if NET3
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using Net3_Proxy;
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using Path = Net3_Proxy.Path;
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using File = Net3_Proxy.File;
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using Directory = Net3_Proxy.Directory;
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#endif
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namespace IPA.Loader
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{
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internal class PluginExecutor
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{
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public PluginMetadata Metadata { get; }
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public PluginExecutor(PluginMetadata meta)
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{
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Metadata = meta;
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PrepareDelegates();
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}
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private object pluginObject = null;
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private Func<PluginMetadata, object> CreatePlugin { get; set; }
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private Action<object> LifecycleEnable { get; set; }
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// disable may be async (#24)
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private Func<object, Task> LifecycleDisable { get; set; }
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public void Create()
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{
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if (pluginObject != null) return;
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pluginObject = CreatePlugin(Metadata);
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}
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public void Enable() => LifecycleEnable(pluginObject);
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public Task Disable() => LifecycleDisable(pluginObject);
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private void PrepareDelegates()
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{ // TODO: use custom exception types or something
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PluginLoader.Load(Metadata);
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var type = Metadata.Assembly.GetType(Metadata.PluginType.FullName);
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CreatePlugin = MakeCreateFunc(type, Metadata.Name);
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LifecycleEnable = MakeLifecycleEnableFunc(type, Metadata.Name);
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LifecycleDisable = MakeLifecycleDisableFunc(type, Metadata.Name);
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}
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private static Func<PluginMetadata, object> MakeCreateFunc(Type type, string name)
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{ // TODO: what do i want the visibiliy of Init methods to be?
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var ctors = type.GetConstructors(BindingFlags.Public | BindingFlags.Instance)
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.Select(c => (c, attr: c.GetCustomAttribute<InitAttribute>()))
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.NonNull(t => t.attr)
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.OrderByDescending(t => t.c.GetParameters().Length)
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.Select(t => t.c).ToArray();
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if (ctors.Length > 1)
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Logger.loader.Warn($"Plugin {name} has multiple [Init] constructors. Picking the one with the most parameters.");
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bool usingDefaultCtor = false;
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var ctor = ctors.FirstOrDefault();
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if (ctor == null)
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{ // this is a normal case
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usingDefaultCtor = true;
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ctor = type.GetConstructor(Type.EmptyTypes);
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if (ctor == null)
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throw new InvalidOperationException($"{type.FullName} does not expose a public default constructor and has no constructors marked [Init]");
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}
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var initMethods = type.GetMethods(BindingFlags.Public | BindingFlags.Instance)
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.Select(m => (m, attr: m.GetCustomAttribute<InitAttribute>()))
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.NonNull(t => t.attr).Select(t => t.m).ToArray();
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// verify that they don't have lifecycle attributes on them
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foreach (var method in initMethods)
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{
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var attrs = method.GetCustomAttributes(typeof(IEdgeLifecycleAttribute), false);
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if (attrs.Length != 0)
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throw new InvalidOperationException($"Method {method} on {type.FullName} has both an [Init] attribute and a lifecycle attribute.");
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}
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// TODO: how do I make this work for .NET 3? FEC.LightExpression but hacked to work on .NET 3?
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var metaParam = Expression.Parameter(typeof(PluginMetadata));
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var objVar = Expression.Variable(type);
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var createExpr = Expression.Lambda<Func<PluginMetadata, object>>(
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Expression.Block(
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initMethods
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.Select(m => PluginInitInjector.InjectedCallExpr(m.GetParameters(), metaParam, es => Expression.Call(objVar, m, es)))
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.Prepend(Expression.Assign(objVar,
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usingDefaultCtor
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? Expression.New(ctor)
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: PluginInitInjector.InjectedCallExpr(ctor.GetParameters(), metaParam, es => Expression.New(ctor, es))))
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.Append(Expression.Convert(objVar, typeof(object)))),
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metaParam);
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// TODO: since this new system will be doing a fuck load of compilation, maybe add FastExpressionCompiler
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return createExpr.Compile();
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}
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private static Action<object> MakeLifecycleEnableFunc(Type type, string name)
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{
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var enableMethods = type.GetMethods(BindingFlags.Public | BindingFlags.Instance)
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.Select(m => (m, attrs: m.GetCustomAttributes(typeof(IEdgeLifecycleAttribute), false)))
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.Select(t => (t.m, attrs: t.attrs.Cast<IEdgeLifecycleAttribute>()))
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.Where(t => t.attrs.Any(a => a.Type == EdgeLifecycleType.Enable))
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.Select(t => t.m).ToArray();
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if (enableMethods.Length == 0)
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{
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Logger.loader.Notice($"Plugin {name} has no methods marked [OnStart] or [OnEnable]. Is this intentional?");
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return o => { };
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}
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foreach (var m in enableMethods)
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{
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if (m.GetParameters().Length > 0)
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throw new InvalidOperationException($"Method {m} on {type.FullName} is marked [OnStart] or [OnEnable] and has parameters.");
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if (m.ReturnType != typeof(void))
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Logger.loader.Warn($"Method {m} on {type.FullName} is marked [OnStart] or [OnEnable] and returns a value. It will be ignored.");
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}
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var objParam = Expression.Parameter(typeof(object));
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var instVar = Expression.Variable(type);
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var createExpr = Expression.Lambda<Action<object>>(
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Expression.Block(
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enableMethods
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.Select(m => Expression.Call(instVar, m))
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.Prepend<Expression>(Expression.Assign(instVar, Expression.Convert(objParam, type)))),
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objParam);
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return createExpr.Compile();
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}
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private static Func<object, Task> MakeLifecycleDisableFunc(Type type, string name)
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{
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var disableMethods = type.GetMethods(BindingFlags.Public | BindingFlags.Instance)
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.Select(m => (m, attrs: m.GetCustomAttributes(typeof(IEdgeLifecycleAttribute), false)))
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.Select(t => (t.m, attrs: t.attrs.Cast<IEdgeLifecycleAttribute>()))
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.Where(t => t.attrs.Any(a => a.Type == EdgeLifecycleType.Disable))
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.Select(t => t.m).ToArray();
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if (disableMethods.Length == 0)
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{
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Logger.loader.Notice($"Plugin {name} has no methods marked [OnExit] or [OnDisable]. Is this intentional?");
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return o => Task.CompletedTask;
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}
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var taskMethods = new List<MethodInfo>();
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var nonTaskMethods = new List<MethodInfo>();
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foreach (var m in disableMethods)
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{
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if (m.GetParameters().Length > 0)
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throw new InvalidOperationException($"Method {m} on {type.FullName} is marked [OnExit] or [OnDisable] and has parameters.");
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if (m.ReturnType != typeof(void))
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{
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if (typeof(Task).IsAssignableFrom(m.ReturnType))
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{
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taskMethods.Add(m);
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continue;
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}
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else
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Logger.loader.Warn($"Method {m} on {type.FullName} is marked [OnExit] or [OnDisable] and returns a non-Task value. It will be ignored.");
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}
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nonTaskMethods.Add(m);
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}
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Expression<Func<Task>> completedTaskDel = () => Task.CompletedTask;
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var getCompletedTask = completedTaskDel.Body;
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var taskWhenAll = typeof(Task).GetMethod(nameof(Task.WhenAll), BindingFlags.Public | BindingFlags.Static);
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var objParam = Expression.Parameter(typeof(object));
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var instVar = Expression.Variable(type);
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var createExpr = Expression.Lambda<Func<object, Task>>(
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Expression.Block(
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nonTaskMethods
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.Select(m => Expression.Call(instVar, m))
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.Prepend<Expression>(Expression.Assign(instVar, Expression.Convert(objParam, type)))
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.Append(
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taskMethods.Count == 0
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? getCompletedTask
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: Expression.Call(taskWhenAll,
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Expression.NewArrayInit(typeof(Task),
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taskMethods.Select(m =>
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Expression.Convert(Expression.Call(instVar, m), typeof(Task))))))),
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objParam);
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return createExpr.Compile();
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}
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}
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}
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