Fixed LS stops working after OS sleep/wakeup cycle

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/src/browser/arduino-frontend-contribution.tsx

@@ -54,7 +54,6 @@ import { OutputContribution } from '@theia/output/lib/browser/output-contributio
 import { ScmContribution } from '@theia/scm/lib/browser/scm-contribution';
 import { SearchInWorkspaceFrontendContribution } from '@theia/search-in-workspace/lib/browser/search-in-workspace-frontend-contribution';
 import { TerminalMenus } from '@theia/terminal/lib/browser/terminal-frontend-contribution';
-import { HostedPluginSupport } from '@theia/plugin-ext/lib/hosted/browser/hosted-plugin';
 import { FileService } from '@theia/filesystem/lib/browser/file-service';
 import { FileChangeType } from '@theia/filesystem/lib/browser';
 import { FrontendApplicationStateService } from '@theia/core/lib/browser/frontend-application-state';
@@ -75,6 +74,7 @@ import { SketchbookWidgetContribution } from './widgets/sketchbook/sketchbook-wi
 import { IDEUpdaterDialog } from './dialogs/ide-updater/ide-updater-dialog';
 import { IDEUpdater } from '../common/protocol/ide-updater';
 import { FileSystemFrontendContribution } from '@theia/filesystem/lib/browser/filesystem-frontend-contribution';
+import { HostedPluginEvents } from './hosted-plugin-events';
 
 const INIT_LIBS_AND_PACKAGES = 'initializedLibsAndPackages';
 export const SKIP_IDE_VERSION = 'skipIDEVersion';
@@ -147,8 +147,8 @@ export class ArduinoFrontendContribution
   @inject(ConfigService)
   protected readonly configService: ConfigService;
 
-  @inject(HostedPluginSupport)
-  protected hostedPluginSupport: HostedPluginSupport;
+  @inject(HostedPluginEvents)
+  protected hostedPluginEvents: HostedPluginEvents;
 
   @inject(ExecutableService)
   protected executableService: ExecutableService;
@@ -317,6 +317,12 @@ export class ArduinoFrontendContribution
       }
     };
     this.boardsServiceClientImpl.onBoardsConfigChanged(start);
+    this.hostedPluginEvents.onPluginsDidStart(() =>
+      start(this.boardsServiceClientImpl.boardsConfig)
+    );
+    this.hostedPluginEvents.onPluginsWillUnload(
+      () => (this.languageServerFqbn = undefined)
+    );
     this.arduinoPreferences.onPreferenceChanged((event) => {
       if (event.newValue !== event.oldValue) {
         switch (event.preferenceName) {
@@ -371,7 +377,7 @@ export class ArduinoFrontendContribution
   ): Promise<void> {
     const release = await this.languageServerStartMutex.acquire();
     try {
-      await this.hostedPluginSupport.didStart;
+      await this.hostedPluginEvents.didStart;
       const details = await this.boardsService.getBoardDetails({ fqbn });
       if (!details) {
         // Core is not installed for the selected board.

arduino-ide-extension/src/browser/arduino-ide-frontend-module.ts

@@ -277,6 +277,9 @@ import {
 import { ElectronIpcConnectionProvider } from '@theia/core/lib/electron-browser/messaging/electron-ipc-connection-provider';
 import { EditorManager as TheiaEditorManager } from '@theia/editor/lib/browser/editor-manager';
 import { EditorManager } from './theia/editor/editor-manager';
+import { HostedPluginEvents } from './hosted-plugin-events';
+import { HostedPluginSupport } from './theia/plugin-ext/hosted-plugin';
+import { HostedPluginSupport as TheiaHostedPluginSupport } from '@theia/plugin-ext/lib/hosted/browser/hosted-plugin';
 
 const ElementQueries = require('css-element-queries/src/ElementQueries');
 
@@ -805,4 +808,9 @@ export default new ContainerModule((bind, unbind, isBound, rebind) => {
       );
     })
     .inSingletonScope();
+
+  bind(HostedPluginSupport).toSelf().inSingletonScope();
+  rebind(TheiaHostedPluginSupport).toService(HostedPluginSupport);
+  bind(HostedPluginEvents).toSelf().inSingletonScope();
+  bind(FrontendApplicationContribution).toService(HostedPluginEvents);
 });

arduino-ide-extension/src/browser/hosted-plugin-events.ts

@@ -0,0 +1,74 @@
+import { DisposableCollection, Emitter, Event } from '@theia/core';
+import { FrontendApplicationContribution } from '@theia/core/lib/browser';
+import { inject, injectable } from '@theia/core/shared/inversify';
+import { HostedPluginSupport } from './theia/plugin-ext/hosted-plugin';
+
+/**
+ * Frontend contribution to watch VS Code extension start/stop events from Theia.
+ *
+ * In Theia, there are no events when a VS Code extension is loaded, started, unloaded, and stopped.
+ * Currently, it's possible to `@inject` the `HostedPluginSupport` service from Theia and `await`
+ * for the `didStart` promise to resolve. But if the OS goes to sleep, the VS Code extensions will
+ * be unloaded and loaded and started again when the OS awakes. Theia reloads the VS Code extensions
+ * after the OS awake event, but the `didStart` promise was already resolved, so IDE2 cannot restart the LS.
+ * This service is meant to work around the limitation of Theia and fire an event every time the VS Code extensions
+ * loaded and started.
+ */
+@injectable()
+export class HostedPluginEvents implements FrontendApplicationContribution {
+  @inject(HostedPluginSupport)
+  private readonly hostedPluginSupport: HostedPluginSupport;
+
+  private firstStart = true;
+  private readonly onPluginsDidStartEmitter = new Emitter<void>();
+  private readonly onPluginsWillUnloadEmitter = new Emitter<void>();
+  private readonly toDispose = new DisposableCollection(
+    this.onPluginsDidStartEmitter,
+    this.onPluginsWillUnloadEmitter
+  );
+
+  onStart(): void {
+    this.hostedPluginSupport.onDidLoad(() => {
+      // Fire the first event, when `didStart` resolves.
+      if (!this.firstStart) {
+        console.debug('HostedPluginEvents', "Received 'onDidLoad' event.");
+        this.onPluginsDidStartEmitter.fire();
+      } else {
+        console.debug(
+          'HostedPluginEvents',
+          "Received 'onDidLoad' event before the first start. Skipping."
+        );
+      }
+    });
+    this.hostedPluginSupport.didStart.then(() => {
+      console.debug('HostedPluginEvents', "Hosted plugins 'didStart'.");
+      if (!this.firstStart) {
+        throw new Error(
+          'Unexpectedly received a `didStart` event after the first start.'
+        );
+      }
+      this.firstStart = false;
+      this.onPluginsDidStartEmitter.fire();
+    });
+    this.hostedPluginSupport.onDidCloseConnection(() => {
+      console.debug('HostedPluginEvents', "Received 'onDidCloseConnection'.");
+      this.onPluginsWillUnloadEmitter.fire();
+    });
+  }
+
+  onStop(): void {
+    this.toDispose.dispose();
+  }
+
+  get onPluginsDidStart(): Event<void> {
+    return this.onPluginsDidStartEmitter.event;
+  }
+
+  get onPluginsWillUnload(): Event<void> {
+    return this.onPluginsWillUnloadEmitter.event;
+  }
+
+  get didStart(): Promise<void> {
+    return this.hostedPluginSupport.didStart;
+  }
+}

arduino-ide-extension/src/browser/theia/plugin-ext/hosted-plugin.ts

@@ -0,0 +1,34 @@
+import { Emitter, Event, JsonRpcProxy } from '@theia/core';
+import { injectable, interfaces } from '@theia/core/shared/inversify';
+import { HostedPluginServer } from '@theia/plugin-ext/lib/common/plugin-protocol';
+import { HostedPluginSupport as TheiaHostedPluginSupport } from '@theia/plugin-ext/lib/hosted/browser/hosted-plugin';
+@injectable()
+export class HostedPluginSupport extends TheiaHostedPluginSupport {
+  private readonly onDidLoadEmitter = new Emitter<void>();
+  private readonly onDidCloseConnectionEmitter = new Emitter<void>();
+
+  override onStart(container: interfaces.Container): void {
+    super.onStart(container);
+    this.hostedPluginServer.onDidCloseConnection(() =>
+      this.onDidCloseConnectionEmitter.fire()
+    );
+  }
+
+  protected override async doLoad(): Promise<void> {
+    await super.doLoad();
+    this.onDidLoadEmitter.fire(); // Unlike Theia, IDE2 fires an event after loading the VS Code extensions.
+  }
+
+  get onDidLoad(): Event<void> {
+    return this.onDidLoadEmitter.event;
+  }
+
+  get onDidCloseConnection(): Event<void> {
+    return this.onDidCloseConnectionEmitter.event;
+  }
+
+  private get hostedPluginServer(): JsonRpcProxy<HostedPluginServer> {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    return (this as any).server;
+  }
+}