Prevent unnecessary activation of the Python extension

.eslintrc.js

@@ -912,7 +912,6 @@ module.exports = {
         'src/client/datascience/notebookAndInteractiveTracker.ts',
         'src/client/datascience/statusProvider.ts',
         'src/client/datascience/jupyter/interpreter/jupyterInterpreterSelectionCommand.ts',
-        'src/client/datascience/jupyter/interpreter/jupyterInterpreterStateStore.ts',
         'src/client/datascience/jupyter/interpreter/jupyterInterpreterOldCacheStateStore.ts',
         'src/client/datascience/jupyter/interpreter/jupyterInterpreterSelector.ts',
         'src/client/datascience/jupyter/interpreter/jupyterInterpreterService.ts',

news/2 Fixes/5193.md

@@ -0,0 +1 @@
+Prevent unnecessary activation of the Python extension.

src/client/activation/activationManager.ts

@@ -73,7 +73,7 @@ export class ExtensionActivationManager implements IExtensionActivationManager {
         this.activatedWorkspaces.add(key);
 
         // Get latest interpreter list in the background.
-        if (this.extensionChecker.isPythonExtensionInstalled) {
+        if (this.extensionChecker.isPythonExtensionActive) {
             this.interpreterService.getInterpreters(resource).ignoreErrors();
         }
 

src/client/api/pythonApi.ts

@@ -49,13 +49,33 @@ import {
 @injectable()
 export class PythonApiProvider implements IPythonApiProvider {
     private readonly api = createDeferred<PythonApi>();
+    private readonly didActivatePython = new EventEmitter<void>();
+    public get onDidActivatePythonExtension() {
+        return this.didActivatePython.event;
+    }
 
     private initialized?: boolean;
+    private hooksRegistered?: boolean;
 
     constructor(
         @inject(IExtensions) private readonly extensions: IExtensions,
+        @inject(IDisposableRegistry) private readonly disposables: IDisposableRegistry,
         @inject(IPythonExtensionChecker) private extensionChecker: IPythonExtensionChecker
-    ) {}
+    ) {
+        const previouslyInstalled = this.extensionChecker.isPythonExtensionInstalled;
+        if (!previouslyInstalled) {
+            this.extensions.onDidChange(
+                async () => {
+                    if (this.extensionChecker.isPythonExtensionInstalled) {
+                        await this.registerHooks();
+                    }
+                },
+                this,
+                this.disposables
+            );
+        }
+        this.disposables.push(this.didActivatePython);
+    }
 
     public getApi(): Promise<PythonApi> {
         this.init().catch(noop);
@@ -78,11 +98,23 @@ export class PythonApiProvider implements IPythonApiProvider {
         if (!pythonExtension) {
             await this.extensionChecker.showPythonExtensionInstallRequiredPrompt();
         } else {
-            if (!pythonExtension.isActive) {
-                await pythonExtension.activate();
-            }
-            pythonExtension.exports.jupyter.registerHooks();
+            await this.registerHooks();
+        }
+    }
+    private async registerHooks() {
+        if (this.hooksRegistered) {
+            return;
+        }
+        const pythonExtension = this.extensions.getExtension<{ jupyter: { registerHooks(): void } }>(PythonExtension);
+        if (!pythonExtension) {
+            return;
         }
+        this.hooksRegistered = true;
+        if (!pythonExtension.isActive) {
+            await pythonExtension.activate();
+            this.didActivatePython.fire();
+        }
+        pythonExtension.exports.jupyter.registerHooks();
     }
 }
 
@@ -106,6 +138,9 @@ export class PythonExtensionChecker implements IPythonExtensionChecker {
     public get isPythonExtensionInstalled() {
         return this.extensions.getExtension(this.pythonExtensionId) !== undefined;
     }
+    public get isPythonExtensionActive() {
+        return this.extensions.getExtension(this.pythonExtensionId)?.isActive === true;
+    }
 
     public async showPythonExtensionInstallRequiredPrompt(): Promise<void> {
         if (this.waitingOnInstallPrompt) {
@@ -292,24 +327,17 @@ export class InterpreterService implements IInterpreterService {
     ) {}
 
     public get onDidChangeInterpreter(): Event<void> {
-        if (this.extensionChecker.isPythonExtensionInstalled && !this.eventHandlerAdded) {
-            this.apiProvider
-                .getApi()
-                .then((api) => {
-                    if (!this.eventHandlerAdded) {
-                        this.eventHandlerAdded = true;
-                        api.onDidChangeInterpreter(
-                            () => {
-                                // Clear our cache of active interpreters.
-                                this.workspaceCachedActiveInterpreter.clear();
-                                this.didChangeInterpreter.fire();
-                            },
-                            this,
-                            this.disposables
-                        );
-                    }
-                })
-                .catch(noop);
+        if (this.extensionChecker.isPythonExtensionInstalled) {
+            if (this.extensionChecker.isPythonExtensionActive && !this.eventHandlerAdded) {
+                this.hookupOnDidChangeInterpreterEvent();
+            }
+            if (!this.extensionChecker.isPythonExtensionActive) {
+                this.apiProvider.onDidActivatePythonExtension(
+                    this.hookupOnDidChangeInterpreterEvent,
+                    this,
+                    this.disposables
+                );
+            }
         }
         return this.didChangeInterpreter.event;
     }
@@ -345,4 +373,18 @@ export class InterpreterService implements IInterpreterService {
             return undefined;
         }
     }
+    private hookupOnDidChangeInterpreterEvent() {
+        if (this.eventHandlerAdded) {
+            return;
+        }
+        this.apiProvider
+            .getApi()
+            .then((api) => {
+                if (!this.eventHandlerAdded) {
+                    this.eventHandlerAdded = true;
+                    api.onDidChangeInterpreter(() => this.didChangeInterpreter.fire(), this, this.disposables);
+                }
+            })
+            .catch(noop);
+    }
 }

src/client/api/types.ts

@@ -19,12 +19,14 @@ export interface ILanguageServer extends Disposable {
 
 export const IPythonApiProvider = Symbol('IPythonApi');
 export interface IPythonApiProvider {
+    onDidActivatePythonExtension: Event<void>;
     getApi(): Promise<PythonApi>;
     setApi(api: PythonApi): void;
 }
 export const IPythonExtensionChecker = Symbol('IPythonExtensionChecker');
 export interface IPythonExtensionChecker {
     readonly isPythonExtensionInstalled: boolean;
+    readonly isPythonExtensionActive: boolean;
     showPythonExtensionInstallRequiredPrompt(): Promise<void>;
     showPythonExtensionInstallRecommendedPrompt(): Promise<void>;
 }

src/client/datascience/activation.ts

@@ -15,7 +15,7 @@ import { JupyterDaemonModule, Telemetry } from './constants';
 import { ActiveEditorContextService } from './commands/activeEditorContext';
 import { JupyterInterpreterService } from './jupyter/interpreter/jupyterInterpreterService';
 import { KernelDaemonPreWarmer } from './kernel-launcher/kernelDaemonPreWarmer';
-import { INotebookCreationTracker, INotebookEditorProvider } from './types';
+import { INotebookCreationTracker, INotebookEditorProvider, IRawNotebookSupportedService } from './types';
 
 @injectable()
 export class Activation implements IExtensionSingleActivationService {
@@ -27,6 +27,7 @@ export class Activation implements IExtensionSingleActivationService {
         @inject(IDisposableRegistry) private readonly disposables: IDisposableRegistry,
         @inject(ActiveEditorContextService) private readonly contextService: ActiveEditorContextService,
         @inject(KernelDaemonPreWarmer) private readonly daemonPoolPrewarmer: KernelDaemonPreWarmer,
+        @inject(IRawNotebookSupportedService) private readonly rawSupported: IRawNotebookSupportedService,
         @inject(INotebookCreationTracker)
         private readonly tracker: INotebookCreationTracker,
         @inject(IPythonExtensionChecker) private readonly extensionChecker: IPythonExtensionChecker
@@ -44,7 +45,7 @@ export class Activation implements IExtensionSingleActivationService {
         this.PreWarmDaemonPool().ignoreErrors();
         sendTelemetryEvent(Telemetry.OpenNotebookAll);
 
-        if (this.extensionChecker.isPythonExtensionInstalled) {
+        if (!this.rawSupported.supported() && this.extensionChecker.isPythonExtensionInstalled) {
             // Warm up our selected interpreter for the extension
             this.jupyterInterpreterService.setInitialInterpreter().ignoreErrors();
         }
@@ -61,7 +62,7 @@ export class Activation implements IExtensionSingleActivationService {
     @debounceAsync(500)
     @swallowExceptions('Failed to pre-warm daemon pool')
     private async PreWarmDaemonPool() {
-        if (!this.extensionChecker.isPythonExtensionInstalled) {
+        if (!this.extensionChecker.isPythonExtensionActive) {
             // Skip prewarm if no python extension
             return;
         }

src/client/datascience/jupyter/interpreter/jupyterInterpreterStateStore.ts

@@ -7,7 +7,7 @@ import { inject, injectable, named } from 'inversify';
 import { Memento } from 'vscode';
 import { IExtensionSingleActivationService } from '../../../activation/types';
 import { IPythonApiProvider, IPythonExtensionChecker } from '../../../api/types';
-import { GLOBAL_MEMENTO, IMemento } from '../../../common/types';
+import { GLOBAL_MEMENTO, IDisposableRegistry, IMemento } from '../../../common/types';
 import { noop } from '../../../common/utils/misc';
 
 const key = 'INTERPRETER_PATH_SELECTED_FOR_JUPYTER_SERVER';
@@ -45,25 +45,35 @@ export class JupyterInterpreterStateStore {
 
 @injectable()
 export class MigrateJupyterInterpreterStateService implements IExtensionSingleActivationService {
+    private settingsMigrated?: boolean;
     constructor(
         @inject(IPythonApiProvider) private readonly api: IPythonApiProvider,
         @inject(IMemento) @named(GLOBAL_MEMENTO) private readonly memento: Memento,
-        @inject(IPythonExtensionChecker) private readonly checker: IPythonExtensionChecker
+        @inject(IPythonExtensionChecker) private readonly checker: IPythonExtensionChecker,
+        @inject(IDisposableRegistry) private readonly disposables: IDisposableRegistry
     ) {}
 
     // Migrate the interpreter path selected for Jupyter server from the Python extension's globalState memento
     public async activate() {
         this.activateBackground().catch(noop);
+        this.api.onDidActivatePythonExtension(this.activateBackground, this, this.disposables);
     }
     public async activateBackground() {
         // Migrate in the background.
         // Python extension will not activate unless Jupyter activates, and here we're waiting for Python.
         // Hence end in deadlock (caught in smoke test).
-        if (!this.memento.get(key) && this.checker.isPythonExtensionInstalled) {
-            const api = await this.api.getApi();
-            const data = api.getInterpreterPathSelectedForJupyterServer();
-            await this.memento.update(key, data);
-            await this.memento.update(keySelected, true);
+        if (!this.memento.get(key) && this.checker.isPythonExtensionActive) {
+            await this.migrateSettings();
         }
     }
+    private async migrateSettings() {
+        if (this.settingsMigrated) {
+            return;
+        }
+        this.settingsMigrated = true;
+        const api = await this.api.getApi();
+        const data = api.getInterpreterPathSelectedForJupyterServer();
+        await this.memento.update(key, data);
+        await this.memento.update(keySelected, true);
+    }
 }

src/client/datascience/kernel-launcher/kernelDaemonPreWarmer.ts

@@ -11,7 +11,9 @@ import { PYTHON_LANGUAGE } from '../../common/constants';
 import '../../common/extensions';
 import { IConfigurationService, IDisposableRegistry, Resource } from '../../common/types';
 import { swallowExceptions } from '../../common/utils/decorators';
-import { isJupyterKernel } from '../notebook/helpers/helpers';
+import { isUntitledFile } from '../../common/utils/misc';
+import { isPythonKernelConnection } from '../jupyter/kernels/helpers';
+import { getNotebookMetadata, isJupyterKernel, isPythonNotebook } from '../notebook/helpers/helpers';
 import {
     IInteractiveWindowProvider,
     INotebookCreationTracker,
@@ -40,7 +42,7 @@ export class KernelDaemonPreWarmer {
         // If not, don't bother with prewarming
         // Also respect the disable autostart setting to not do any prewarming for the user
         if (
-            !(await this.rawNotebookSupported.supported()) ||
+            !this.rawNotebookSupported.supported() ||
             this.configService.getSettings().disableJupyterAutoStart ||
             !this.extensionChecker.isPythonExtensionInstalled
         ) {
@@ -54,14 +56,20 @@ export class KernelDaemonPreWarmer {
 
         this.disposables.push(this.vscodeNotebook.onDidOpenNotebookDocument(this.onDidOpenNotebookDocument, this));
 
-        if (this.notebookEditorProvider.editors.length > 0 || this.interactiveProvider.windows.length > 0) {
+        if (
+            this.extensionChecker.isPythonExtensionActive &&
+            (this.notebookEditorProvider.editors.length > 0 || this.interactiveProvider.windows.length > 0)
+        ) {
             await this.preWarmKernelDaemonPool();
         }
-        await this.preWarmDaemonPoolIfNecesary();
+        await this.preWarmDaemonPoolIfNecessary();
     }
-    private async preWarmDaemonPoolIfNecesary() {
+    private async preWarmDaemonPoolIfNecessary() {
         // This is only for python, so prewarm just if we've seen python recently in this workspace
-        if (this.shouldPreWarmDaemonPool(this.usageTracker.lastPythonNotebookCreated)) {
+        if (
+            this.shouldPreWarmDaemonPool(this.usageTracker.lastPythonNotebookCreated) &&
+            this.extensionChecker.isPythonExtensionActive
+        ) {
             await this.preWarmKernelDaemonPool();
         }
     }
@@ -79,9 +87,16 @@ export class KernelDaemonPreWarmer {
 
     // Handle opening of native documents
     private async onDidOpenNotebookDocument(doc: NotebookDocument): Promise<void> {
+        // It could be anything, lets not make any assumptions.
+        if (isUntitledFile(doc.uri)) {
+            return;
+        }
         const kernel = this.vscodeNotebook.notebookEditors.find((item) => item.document === doc)?.kernel;
+        const isPythonKernel = isJupyterKernel(kernel) ? isPythonKernelConnection(kernel.selection) : false;
+        const notebookMetadata = isPythonNotebook(getNotebookMetadata(doc));
         if (
-            isJupyterKernel(kernel) ||
+            isPythonKernel ||
+            notebookMetadata ||
             doc.cells.some((cell: NotebookCell) => {
                 return cell.document.languageId === PYTHON_LANGUAGE;
             })

src/client/datascience/kernel-launcher/localKernelFinder.ts

@@ -32,7 +32,8 @@ import {
 } from '../jupyter/kernels/types';
 import { IJupyterKernelSpec } from '../types';
 import { ILocalKernelFinder } from './types';
-import { tryGetRealPath } from '../common';
+import { getResourceType, tryGetRealPath } from '../common';
+import { isPythonNotebook } from '../notebook/helpers/helpers';
 
 const winJupyterPath = path.join('AppData', 'Roaming', 'jupyter', 'kernels');
 const linuxJupyterPath = path.join('.local', 'share', 'jupyter', 'kernels');
@@ -90,12 +91,14 @@ export class LocalKernelFinder implements ILocalKernelFinder {
         try {
             // Get list of all of the specs
             const kernels = await this.listKernels(resource, cancelToken);
+            const isPythonNbOrInteractiveWindow =
+                isPythonNotebook(option) || getResourceType(resource) === 'interactive';
 
             // Always include the interpreter in the search if we can
             const interpreter =
                 option && isInterpreter(option)
                     ? option
-                    : resource && this.extensionChecker.isPythonExtensionInstalled
+                    : resource && isPythonNbOrInteractiveWindow && this.extensionChecker.isPythonExtensionInstalled
                     ? await this.interpreterService.getActiveInterpreter(resource)
                     : undefined;