feat(plugins): complete Campaign LA5 cross-host hosting

src/AcDream.App/Plugins/GraphicalPluginSession.cs

@@ -0,0 +1,78 @@
+using AcDream.Core.Plugins;
+using AcDream.Platform;
+using AcDream.Plugin.Abstractions;
+using AcDream.Runtime.Session;
+
+namespace AcDream.App.Plugins;
+
+/// <summary>
+/// Graphical-host composition for one plugin set. The shared
+/// <see cref="PluginSession"/> owns discovery and collectible lifetimes; this
+/// adapter supplies the graphical roots and translates outcomes into the
+/// launcher status stream.
+/// </summary>
+internal sealed class GraphicalPluginSession : IDisposable
+{
+    private readonly PluginSession _plugins;
+
+    private GraphicalPluginSession(PluginSession plugins)
+    {
+        _plugins = plugins;
+    }
+
+    internal int LoadedCount => _plugins.LoadedCount;
+
+    internal IReadOnlyList<WeakReference> CaptureLoadContextWeakReferences() =>
+        _plugins.CaptureLoadContextWeakReferences();
+
+    internal static GraphicalPluginSession Start(
+        ApplicationPathSet paths,
+        IReadOnlyList<string>? allowList,
+        string sessionId,
+        IPluginHost host,
+        SessionStatusWriter statusWriter)
+    {
+        ArgumentNullException.ThrowIfNull(paths);
+        ArgumentException.ThrowIfNullOrWhiteSpace(sessionId);
+        ArgumentNullException.ThrowIfNull(host);
+        ArgumentNullException.ThrowIfNull(statusWriter);
+
+        var plugins = new PluginSession(
+            host,
+            status => Report(statusWriter, sessionId, status));
+        try
+        {
+            plugins.Start(
+            [
+                Path.Combine(AppContext.BaseDirectory, "plugins"),
+                paths.PluginsDirectory,
+            ],
+            allowList);
+            return new GraphicalPluginSession(plugins);
+        }
+        catch
+        {
+            plugins.Dispose();
+            throw;
+        }
+    }
+
+    public void Dispose() => _plugins.Dispose();
+
+    private static void Report(
+        SessionStatusWriter writer,
+        string sessionId,
+        PluginSessionStatus status)
+    {
+        if (status.Kind == PluginSessionStatusKind.Loaded)
+        {
+            writer.PluginLoaded(sessionId, status.Plugin);
+            return;
+        }
+
+        writer.PluginFailed(
+            sessionId,
+            status.Plugin,
+            status.Error ?? "plugin failed");
+    }
+}