73 lines
2.6 KiB
C#
73 lines
2.6 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Runtime.Loader;
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namespace LANCommander.SDK.Plugins;
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/// <summary>
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/// An isolated <see cref="AssemblyLoadContext"/> for a single plugin. Uses an
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/// <see cref="AssemblyDependencyResolver"/> to resolve the plugin's private dependencies while
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/// deferring host-provided assemblies (the SDK, DI abstractions, Avalonia, etc.) to the default
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/// context so that shared types keep a single identity across the ALC boundary.
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/// </summary>
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public sealed class PluginLoadContext : AssemblyLoadContext
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{
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private readonly AssemblyDependencyResolver _resolver;
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/// <summary>
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/// Simple assembly names that must always resolve to the host's already-loaded copy so that
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/// contract types (<see cref="IPlugin"/>, DI, event bus, UI contracts) share identity. Matched
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/// as a prefix so, e.g., all Avalonia.* assemblies are covered.
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/// </summary>
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private static readonly string[] SharedAssemblyPrefixes =
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{
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"LANCommander.SDK",
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"LANCommander.Launcher.Plugins",
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"LANCommander.Server.Services",
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"Microsoft.Extensions.DependencyInjection",
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"Microsoft.Extensions.Logging",
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"Microsoft.Extensions.Hosting",
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"Microsoft.Extensions.Options",
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"Microsoft.Extensions.Configuration",
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"Avalonia",
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"CommunityToolkit.Mvvm",
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"System.Management.Automation",
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};
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public PluginLoadContext(string mainAssemblyPath)
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: base(name: $"Plugin:{System.IO.Path.GetFileNameWithoutExtension(mainAssemblyPath)}", isCollectible: false)
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{
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_resolver = new AssemblyDependencyResolver(mainAssemblyPath);
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}
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protected override Assembly? Load(AssemblyName assemblyName)
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{
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if (IsShared(assemblyName.Name))
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return null; // defer to the default context for shared/host-provided assemblies
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var path = _resolver.ResolveAssemblyToPath(assemblyName);
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return path is null ? null : LoadFromAssemblyPath(path);
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}
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protected override IntPtr LoadUnmanagedDll(string unmanagedDllName)
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{
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var path = _resolver.ResolveUnmanagedDllToPath(unmanagedDllName);
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return path is null ? IntPtr.Zero : LoadUnmanagedDllFromPath(path);
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}
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private static bool IsShared(string? simpleName)
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{
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if (string.IsNullOrEmpty(simpleName))
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return false;
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foreach (var prefix in SharedAssemblyPrefixes)
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{
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if (simpleName.StartsWith(prefix, StringComparison.OrdinalIgnoreCase))
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return true;
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}
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return false;
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}
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}
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