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feat: Python LSP
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‎LSP.md‎

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‎src/kernels/deepnote/deepnoteLspClientManager.node.ts‎

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// Copyright (c) Microsoft Corporation.
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// Licensed under the MIT License.
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import * as vscode from 'vscode';
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import { inject, injectable } from 'inversify';
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import { LanguageClient, LanguageClientOptions, Executable } from 'vscode-languageclient/node';
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import { IDisposable, IDisposableRegistry } from '../../platform/common/types';
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import { IExtensionSyncActivationService } from '../../platform/activation/types';
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import { DeepnoteServerInfo, IDeepnoteLspClientManager } from './types';
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import { PythonEnvironment } from '../../platform/pythonEnvironments/info';
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import { logger } from '../../platform/logging';
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import { noop } from '../../platform/common/utils/misc';
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interface LspClientInfo {
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pythonClient?: LanguageClient;
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sqlClient?: LanguageClient;
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}
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/**
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* Manages LSP client connections to Deepnote Toolkit's language servers.
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* Creates and manages Python and SQL LSP clients for code intelligence.
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*/
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@injectable()
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export class DeepnoteLspClientManager
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implements IDeepnoteLspClientManager, IExtensionSyncActivationService, IDisposable
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{
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// Map notebook URIs to their LSP clients
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private readonly clients = new Map<string, LspClientInfo>();
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private disposed = false;
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constructor(@inject(IDisposableRegistry) private readonly disposables: IDisposableRegistry) {
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this.disposables.push(this);
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}
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public activate(): void {
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// This service is activated synchronously and doesn't need async initialization
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logger.info('DeepnoteLspClientManager activated');
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}
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public async startLspClients(
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_serverInfo: DeepnoteServerInfo,
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notebookUri: vscode.Uri,
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interpreter: PythonEnvironment
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): Promise<void> {
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if (this.disposed) {
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return;
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}
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const notebookKey = notebookUri.toString();
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// Check if clients already exist for this notebook
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if (this.clients.has(notebookKey)) {
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logger.trace(`LSP clients already started for ${notebookKey}`);
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return;
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}
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logger.info(`Starting LSP clients for ${notebookKey} using interpreter ${interpreter.uri.fsPath}`);
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try {
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// Start Python LSP client
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const pythonClient = await this.createPythonLspClient(notebookUri, interpreter);
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// Store the client info
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const clientInfo: LspClientInfo = {
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pythonClient
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// TODO: Add SQL client when endpoint is determined
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};
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this.clients.set(notebookKey, clientInfo);
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logger.info(`LSP clients started successfully for ${notebookKey}`);
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} catch (error) {
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logger.error(`Failed to start LSP clients for ${notebookKey}:`, error);
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throw error;
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}
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}
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public async stopLspClients(notebookUri: vscode.Uri): Promise<void> {
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const notebookKey = notebookUri.toString();
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const clientInfo = this.clients.get(notebookKey);
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if (!clientInfo) {
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return;
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}
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logger.info(`Stopping LSP clients for ${notebookKey}`);
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try {
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// Stop Python client
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if (clientInfo.pythonClient) {
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await clientInfo.pythonClient.stop();
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}
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// Stop SQL client
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if (clientInfo.sqlClient) {
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await clientInfo.sqlClient.stop();
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}
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this.clients.delete(notebookKey);
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logger.info(`LSP clients stopped for ${notebookKey}`);
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} catch (error) {
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logger.error(`Error stopping LSP clients for ${notebookKey}:`, error);
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}
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}
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public async stopAllClients(): Promise<void> {
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logger.info('Stopping all LSP clients');
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const stopPromises: Promise<void>[] = [];
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for (const [, clientInfo] of this.clients.entries()) {
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if (clientInfo.pythonClient) {
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stopPromises.push(clientInfo.pythonClient.stop().catch(noop));
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}
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if (clientInfo.sqlClient) {
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stopPromises.push(clientInfo.sqlClient.stop().catch(noop));
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}
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}
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await Promise.all(stopPromises);
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this.clients.clear();
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}
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public dispose(): void {
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this.disposed = true;
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// Stop all clients asynchronously but don't wait
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void this.stopAllClients();
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}
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private async createPythonLspClient(
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notebookUri: vscode.Uri,
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interpreter: PythonEnvironment
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): Promise<LanguageClient> {
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// Start python-lsp-server as a child process using stdio
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const pythonPath = interpreter.uri.fsPath;
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logger.trace(`Creating Python LSP client using interpreter: ${pythonPath}`);
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// Define the server executable
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const serverOptions: Executable = {
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command: pythonPath,
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args: ['-m', 'pylsp'], // Start python-lsp-server
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options: {
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env: { ...process.env }
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}
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};
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const clientOptions: LanguageClientOptions = {
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// Document selector for Python cells in Deepnote notebooks
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documentSelector: [
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{
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scheme: 'vscode-notebook-cell',
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language: 'python',
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pattern: '**/*.deepnote'
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},
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{
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scheme: 'file',
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language: 'python',
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pattern: '**/*.deepnote'
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}
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],
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// Synchronization settings
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synchronize: {
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// Notify the server about file changes to '.py' files in the workspace
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fileEvents: vscode.workspace.createFileSystemWatcher('**/*.py')
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},
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// Output channel for diagnostics
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outputChannelName: 'Deepnote Python LSP'
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};
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// Create the language client with stdio connection
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const client = new LanguageClient(
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'deepnote-python-lsp',
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'Deepnote Python Language Server',
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serverOptions,
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clientOptions
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);
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// Start the client
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await client.start();
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logger.info(`Python LSP client started for ${notebookUri.toString()}`);
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return client;
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}
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// TODO: Implement SQL LSP client when endpoint information is available
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// private async createSqlLspClient(serverInfo: DeepnoteServerInfo, notebookUri: vscode.Uri): Promise<LanguageClient> {
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// // Similar to Python client but for SQL
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// }
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}

‎src/kernels/deepnote/deepnoteLspClientManager.node.vscode.test.ts‎

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import { assert } from 'chai';
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import { Uri } from 'vscode';
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import { DeepnoteLspClientManager } from './deepnoteLspClientManager.node';
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import { IDisposableRegistry } from '../../platform/common/types';
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import { PythonEnvironment } from '../../platform/pythonEnvironments/info';
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import * as path from '../../platform/vscode-path/path';
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suite('DeepnoteLspClientManager Integration Tests', () => {
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let lspClientManager: DeepnoteLspClientManager;
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const testNotebookPath = path.join(
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__dirname,
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'..',
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'..',
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'..',
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'src',
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'test',
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'testFiles',
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'Bunch-of-charts.deepnote'
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);
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const testNotebookUri = Uri.file(testNotebookPath);
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// Mock disposable registry
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const mockDisposableRegistry: IDisposableRegistry = {
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push: () => 0,
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dispose: () => Promise.resolve()
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} as any;
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setup(() => {
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lspClientManager = new DeepnoteLspClientManager(mockDisposableRegistry);
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lspClientManager.activate();
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});
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teardown(async () => {
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if (lspClientManager) {
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await lspClientManager.stopAllClients();
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}
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});
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test('LSP Client Manager should be instantiable', () => {
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assert.isDefined(lspClientManager, 'LSP Client Manager should be created');
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});
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test('Should handle starting LSP clients with mock interpreter', async function () {
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this.timeout(10000);
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// Create a mock interpreter (pointing to system Python for test)
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const mockInterpreter: PythonEnvironment = {
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id: '/usr/bin/python3',
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uri: Uri.file('/usr/bin/python3')
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} as PythonEnvironment;
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const mockServerInfo = {
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url: 'http://localhost:8888',
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jupyterPort: 8888,
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lspPort: 8889,
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token: 'test-token'
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};
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// This will attempt to start LSP clients but may fail if pylsp isn't installed
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// We're mainly testing that the code path executes without crashing
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try {
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await lspClientManager.startLspClients(mockServerInfo, testNotebookUri, mockInterpreter);
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// If successful, clean up
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await lspClientManager.stopLspClients(testNotebookUri);
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assert.ok(true, 'LSP client lifecycle completed successfully');
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} catch (error) {
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// Expected to fail if python-lsp-server is not installed in the test environment
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// We're verifying the code doesn't crash, not that LSP actually works
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const errorMessage = error instanceof Error ? error.message : String(error);
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console.log(`LSP client start failed (expected in test env): ${errorMessage}`);
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assert.ok(true, 'LSP client start failed as expected in test environment');
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}
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});
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test('Should handle stopping non-existent LSP clients gracefully', async () => {
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const nonExistentUri = Uri.file('/path/to/nonexistent.deepnote');
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// Should not throw
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await lspClientManager.stopLspClients(nonExistentUri);
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assert.ok(true, 'Stopping non-existent client handled gracefully');
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});
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test('Should handle stopAllClients', async () => {
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// Should not throw even if no clients are running
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await lspClientManager.stopAllClients();
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assert.ok(true, 'stopAllClients completed without error');
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});
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test('Should not start duplicate clients for same notebook', async function () {
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this.timeout(10000);
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const mockInterpreter: PythonEnvironment = {
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id: '/usr/bin/python3',
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uri: Uri.file('/usr/bin/python3')
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} as PythonEnvironment;
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const mockServerInfo = {
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url: 'http://localhost:8888',
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jupyterPort: 8888,
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lspPort: 8889,
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token: 'test-token'
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};
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try {
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// Try to start clients twice for the same notebook
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await lspClientManager.startLspClients(mockServerInfo, testNotebookUri, mockInterpreter);
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await lspClientManager.startLspClients(mockServerInfo, testNotebookUri, mockInterpreter);
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// Clean up
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await lspClientManager.stopLspClients(testNotebookUri);
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assert.ok(true, 'Duplicate client prevention works');
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} catch (error) {
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// Expected to fail if python-lsp-server is not installed
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console.log(`Test completed with expected LSP unavailability`);
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assert.ok(true, 'Duplicate prevention tested despite LSP unavailability');
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}
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});
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});

‎src/kernels/deepnote/deepnoteToolkitInstaller.node.ts‎

Lines changed: 7 additions & 4 deletions
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@@ -278,9 +278,11 @@ export class DeepnoteToolkitInstaller implements IDeepnoteToolkitInstaller {
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279279
Cancellation.throwIfCanceled(token);
280280

281-
// Install deepnote-toolkit and ipykernel in venv
282-
logger.info(`Installing deepnote-toolkit (${DEEPNOTE_TOOLKIT_VERSION}) and ipykernel in venv from PyPI`);
283-
this.outputChannel.appendLine(l10n.t('Installing deepnote-toolkit and ipykernel...'));
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// Install deepnote-toolkit, ipykernel, and python-lsp-server in venv
282+
logger.info(
283+
`Installing deepnote-toolkit (${DEEPNOTE_TOOLKIT_VERSION}), ipykernel, and python-lsp-server in venv from PyPI`
284+
);
285+
this.outputChannel.appendLine(l10n.t('Installing deepnote-toolkit, ipykernel, and python-lsp-server...'));
284286

285287
const installResult = await venvProcessService.exec(
286288
venvInterpreter.uri.fsPath,
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'install',
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'--upgrade',
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`deepnote-toolkit[server]==${DEEPNOTE_TOOLKIT_VERSION}`,
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'ipykernel'
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'ipykernel',
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'python-lsp-server[all]'
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],
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{ throwOnStdErr: false }
296299
);

‎src/kernels/deepnote/types.ts‎

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@@ -317,6 +317,32 @@ export interface IDeepnoteNotebookEnvironmentMapper {
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getNotebooksUsingEnvironment(environmentId: string): vscode.Uri[];
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}
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320+
export const IDeepnoteLspClientManager = Symbol('IDeepnoteLspClientManager');
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export interface IDeepnoteLspClientManager {
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/**
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* Start LSP clients for a Deepnote server
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* @param serverInfo Server information
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* @param notebookUri The notebook URI for which to start LSP clients
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* @param interpreter The Python interpreter from the venv
327+
*/
328+
startLspClients(
329+
serverInfo: DeepnoteServerInfo,
330+
notebookUri: vscode.Uri,
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interpreter: PythonEnvironment
332+
): Promise<void>;
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/**
335+
* Stop LSP clients for a notebook
336+
* @param notebookUri The notebook URI
337+
*/
338+
stopLspClients(notebookUri: vscode.Uri): Promise<void>;
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340+
/**
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* Stop all LSP clients
342+
*/
343+
stopAllClients(): Promise<void>;
344+
}
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export const DEEPNOTE_TOOLKIT_VERSION = '1.1.0';
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export const DEEPNOTE_DEFAULT_PORT = 8888;
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export const DEEPNOTE_NOTEBOOK_TYPE = 'deepnote';

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