Handle better the case when web workers are not available / misconfigured

build/monaco/CHANGELOG.md

+# Monaco Editor Change log
+
+## [0.5.0]
+
+### Breaking changes
+- `createWebWorker` now loads the AMD module and calls `create` and passes in as first argument a context of type `monaco.worker.IWorkerContext` and as second argument the `initData`. This breaking change was needed to allow handling the case of misconfigured web workers (running of a file protocol or a cross-domain case)
+- the `CodeActionProvider.provideCodeActions` now gets passed in a `CodeActionContext` that contains the markers at the relevant range.
\ No newline at end of file

src/vs/base/common/worker/simpleWorker.ts

@@ -165,9 +165,21 @@ export class SimpleWorkerClient<T> extends Disposable {
 
 	constructor(workerFactory:IWorkerFactory, moduleId:string) {
 		super();
-		this._worker = this._register(workerFactory.create('vs/base/common/worker/simpleWorker', (msg:string) => {
-			this._protocol.handleMessage(msg);
-		}));
+
+		let lazyProxyFulfill : (v:T)=>void = null;
+		let lazyProxyReject: (err:any)=>void = null;
+
+		this._worker = this._register(workerFactory.create(
+			'vs/base/common/worker/simpleWorker',
+			(msg:string) => {
+				this._protocol.handleMessage(msg);
+			},
+			(err:any) => {
+				// in Firefox, web workers fail lazily :(
+				// we will reject the proxy
+				lazyProxyReject(err);
+			}
+		));
 
 		this._protocol = new SimpleWorkerProtocol({
 			sendMessage: (msg:string): void => {
@@ -191,9 +203,6 @@ export class SimpleWorkerClient<T> extends Disposable {
 			loaderConfiguration = (<any>window).requirejs.s.contexts._.config;
 		}
 
-		let lazyProxyFulfill : (v:T)=>void = null;
-		let lazyProxyReject: (err:any)=>void = null;
-
 		this._lazyProxy = new TPromise((c, e, p) => {
 			lazyProxyFulfill = c;
 			lazyProxyReject = e;

src/vs/base/common/worker/workerClient.ts

@@ -17,12 +17,21 @@ export interface IWorker {
 	dispose():void;
 }
 
+let webWorkerWarningLogged = false;
+export function logOnceWebWorkerWarning(err:any): void {
+	if (!webWorkerWarningLogged) {
+		webWorkerWarningLogged = true;
+		console.warn('Could not create web worker(s). Falling back to loading web worker code in main thread, which might cause UI freezes. Please see https://github.com/Microsoft/monaco-editor#faq');
+	}
+	console.warn(err.message);
+}
+
 export interface IWorkerCallback {
 	(message:string):void;
 }
 
 export interface IWorkerFactory {
-	create(moduleId:string, callback:IWorkerCallback, onCrashCallback?:()=>void):IWorker;
+	create(moduleId:string, callback:IWorkerCallback, onErrorCallback:(err:any)=>void):IWorker;
 }
 
 interface IActiveRequest {
@@ -59,7 +68,15 @@ export class WorkerClient {
 		this._waitingForWorkerReply = false;
 		this._lastTimerEvent = null;
 
-		this._worker = workerFactory.create('vs/base/common/worker/workerServer', (msg) => this._onSerializedMessage(msg));
+		this._worker = workerFactory.create(
+			'vs/base/common/worker/workerServer',
+			(msg) => this._onSerializedMessage(msg),
+			(err) => {
+				// reject the onModuleLoaded promise, this signals that things are bad
+				let promiseEntry:IActiveRequest = this._promises[1];
+				delete this._promises[1];
+				promiseEntry.error(err);
+			});
 
 		let loaderConfiguration:any = null;
 
@@ -80,7 +97,6 @@ export class WorkerClient {
 			loaderConfiguration: loaderConfiguration,
 			GlobalEnvironment: GlobalEnvironment
 		});
-		this.onModuleLoaded.then(null, (e) => this._onError('Worker failed to load ' + moduleId, e));
 
 		this._remoteCom = new workerProtocol.RemoteCom(this);
 	}

src/vs/base/worker/defaultWorkerFactory.ts

@@ -6,7 +6,7 @@
 
 import * as flags from 'vs/base/common/flags';
 import {IDisposable, dispose} from 'vs/base/common/lifecycle';
-import {IWorker, IWorkerCallback, IWorkerFactory} from 'vs/base/common/worker/workerClient';
+import {logOnceWebWorkerWarning, IWorker, IWorkerCallback, IWorkerFactory} from 'vs/base/common/worker/workerClient';
 import * as dom from 'vs/base/browser/dom';
 
 function defaultGetWorkerUrl(workerId:string, label:string): string {
@@ -24,13 +24,16 @@ class WebWorker implements IWorker {
 	private id:number;
 	private worker:Worker;
 
-	constructor(moduleId:string, id:number, label:string, onMessageCallback:IWorkerCallback) {
+	constructor(moduleId:string, id:number, label:string, onMessageCallback:IWorkerCallback, onErrorCallback:(err:any)=>void) {
 		this.id = id;
 		this.worker = new Worker(getWorkerUrl('workerMain.js', label));
 		this.postMessage(moduleId);
 		this.worker.onmessage = function (ev:any) {
 			onMessageCallback(ev.data);
 		};
+		if (typeof this.worker.addEventListener === 'function') {
+			this.worker.addEventListener('error', onErrorCallback);
+		}
 	}
 
 	public getId(): number {
@@ -125,11 +128,41 @@ export class DefaultWorkerFactory implements IWorkerFactory {
 
 	private static LAST_WORKER_ID = 0;
 
-	public create(moduleId:string, onMessageCallback:IWorkerCallback):IWorker {
-		var workerId = (++DefaultWorkerFactory.LAST_WORKER_ID);
-		if (typeof WebWorker !== 'undefined') {
-			return new WebWorker(moduleId, workerId, 'service' + workerId, onMessageCallback);
+	private _fallbackToIframe:boolean;
+	private _webWorkerFailedBeforeError:any;
+
+	constructor(fallbackToIframe:boolean) {
+		this._fallbackToIframe = fallbackToIframe;
+		this._webWorkerFailedBeforeError = false;
+	}
+
+	public create(moduleId:string, onMessageCallback:IWorkerCallback, onErrorCallback:(err:any)=>void):IWorker {
+		let workerId = (++DefaultWorkerFactory.LAST_WORKER_ID);
+		if (this._fallbackToIframe) {
+			if (this._webWorkerFailedBeforeError) {
+				// Avoid always trying to create web workers if they would just fail...
+				return new FrameWorker(moduleId, workerId, onMessageCallback);
+			}
+
+			try {
+				return new WebWorker(moduleId, workerId, 'service' + workerId, onMessageCallback, (err) => {
+					logOnceWebWorkerWarning(err);
+					this._webWorkerFailedBeforeError = err;
+					onErrorCallback(err);
+				});
+			} catch(err) {
+				logOnceWebWorkerWarning(err);
+				return new FrameWorker(moduleId, workerId, onMessageCallback);
+			}
 		}
-		return new FrameWorker(moduleId, workerId, onMessageCallback);
+
+		if (this._webWorkerFailedBeforeError) {
+			throw this._webWorkerFailedBeforeError;
+		}
+		return new WebWorker(moduleId, workerId, 'service' + workerId, onMessageCallback, (err) => {
+			logOnceWebWorkerWarning(err);
+			this._webWorkerFailedBeforeError = err;
+			onErrorCallback(err);
+		});
 	}
-}
\ No newline at end of file
+}

src/vs/editor/common/services/editorSimpleWorker.ts

@@ -7,6 +7,7 @@
 
 import URI from 'vs/base/common/uri';
 import {TPromise} from 'vs/base/common/winjs.base';
+import {IDisposable} from 'vs/base/common/lifecycle';
 import {IRequestHandler} from 'vs/base/common/worker/simpleWorker';
 import {Range} from 'vs/editor/common/core/range';
 import {fuzzyContiguousFilter} from 'vs/base/common/filters';
@@ -23,13 +24,37 @@ import {createMonacoBaseAPI} from 'vs/editor/common/standalone/standaloneBase';
 export interface IMirrorModel {
 	uri: URI;
 	version: number;
-	getText(): string;
+	getValue(): string;
+}
+
+export interface IWorkerContext {
+	/**
+	 * Get all available mirror models in this worker.
+	 */
+	getMirrorModels(): IMirrorModel[];
+}
+
+/**
+ * @internal
+ */
+export interface ICommonModel {
+	uri: URI;
+	version: number;
+	getValue(): string;
+
+	getLinesContent(): string[];
+	getLineCount(): number;
+	getLineContent(lineNumber:number): string;
+	getWordUntilPosition(position: editorCommon.IPosition, wordDefinition:RegExp): editorCommon.IWordAtPosition;
+	getAllUniqueWords(wordDefinition:RegExp, skipWordOnce?:string) : string[];
+	getValueInRange(range:editorCommon.IRange): string;
+	getWordAtPosition(position:editorCommon.IPosition, wordDefinition:RegExp): Range;
 }
 
 /**
  * @internal
  */
-export class MirrorModel extends MirrorModel2 {
+export class MirrorModel extends MirrorModel2 implements ICommonModel {
 
 	public get uri(): URI {
 		return this._uri;
@@ -39,6 +64,10 @@ export class MirrorModel extends MirrorModel2 {
 		return this._versionId;
 	}
 
+	public getValue(): string {
+		return this.getText();
+	}
+
 	public getLinesContent(): string[] {
 		return this._lines.slice(0);
 	}
@@ -146,47 +175,21 @@ export class MirrorModel extends MirrorModel2 {
 /**
  * @internal
  */
-export class EditorSimpleWorkerImpl implements IRequestHandler {
-	_requestHandlerTrait: any;
-
-	private _models:{[uri:string]:MirrorModel;};
+export abstract class BaseEditorSimpleWorker {
 	private _foreignModule: any;
 
 	constructor() {
-		this._models = Object.create(null);
 		this._foreignModule = null;
 	}
 
-	public getModels(): MirrorModel[] {
-		let all: MirrorModel[] = [];
-		Object.keys(this._models).forEach((key) => all.push(this._models[key]));
-		return all;
-	}
-
-	public acceptNewModel(data:IRawModelData): void {
-		this._models[data.url] = new MirrorModel(URI.parse(data.url), data.value.lines, data.value.EOL, data.versionId);
-	}
-
-	public acceptModelChanged(strURL: string, events: editorCommon.IModelContentChangedEvent2[]): void {
-		if (!this._models[strURL]) {
-			return;
-		}
-		let model = this._models[strURL];
-		model.onEvents(events);
-	}
-
-	public acceptRemovedModel(strURL: string): void {
-		if (!this._models[strURL]) {
-			return;
-		}
-		delete this._models[strURL];
-	}
+	protected abstract _getModel(uri:string): ICommonModel;
+	protected abstract _getModels(): ICommonModel[];
 
 	// ---- BEGIN diff --------------------------------------------------------------------------
 
 	public computeDiff(originalUrl:string, modifiedUrl:string, ignoreTrimWhitespace:boolean): TPromise<editorCommon.ILineChange[]> {
-		let original = this._models[originalUrl];
-		let modified = this._models[modifiedUrl];
+		let original = this._getModel(originalUrl);
+		let modified = this._getModel(modifiedUrl);
 		if (!original || !modified) {
 			return null;
 		}
@@ -202,8 +205,8 @@ export class EditorSimpleWorkerImpl implements IRequestHandler {
 	}
 
 	public computeDirtyDiff(originalUrl:string, modifiedUrl:string, ignoreTrimWhitespace:boolean):TPromise<editorCommon.IChange[]> {
-		let original = this._models[originalUrl];
-		let modified = this._models[modifiedUrl];
+		let original = this._getModel(originalUrl);
+		let modified = this._getModel(modifiedUrl);
 		if (!original || !modified) {
 			return null;
 		}
@@ -221,7 +224,7 @@ export class EditorSimpleWorkerImpl implements IRequestHandler {
 	// ---- END diff --------------------------------------------------------------------------
 
 	public computeLinks(modelUrl:string):TPromise<ILink[]> {
-		let model = this._models[modelUrl];
+		let model = this._getModel(modelUrl);
 		if (!model) {
 			return null;
 		}
@@ -232,7 +235,7 @@ export class EditorSimpleWorkerImpl implements IRequestHandler {
 	// ---- BEGIN suggest --------------------------------------------------------------------------
 
 	public textualSuggest(modelUrl:string, position: editorCommon.IPosition, wordDef:string, wordDefFlags:string): TPromise<ISuggestResult[]> {
-		let model = this._models[modelUrl];
+		let model = this._getModel(modelUrl);
 		if (!model) {
 			return null;
 		}
@@ -240,7 +243,7 @@ export class EditorSimpleWorkerImpl implements IRequestHandler {
 		return TPromise.as(this._suggestFiltered(model, position, new RegExp(wordDef, wordDefFlags)));
 	}
 
-	private _suggestFiltered(model:MirrorModel, position: editorCommon.IPosition, wordDefRegExp: RegExp): ISuggestResult[] {
+	private _suggestFiltered(model:ICommonModel, position: editorCommon.IPosition, wordDefRegExp: RegExp): ISuggestResult[] {
 		let value = this._suggestUnfiltered(model, position, wordDefRegExp);
 
 		// filter suggestions
@@ -251,7 +254,7 @@ export class EditorSimpleWorkerImpl implements IRequestHandler {
 		}];
 	}
 
-	private _suggestUnfiltered(model:MirrorModel, position:editorCommon.IPosition, wordDefRegExp: RegExp): ISuggestResult {
+	private _suggestUnfiltered(model:ICommonModel, position:editorCommon.IPosition, wordDefRegExp: RegExp): ISuggestResult {
 		let currentWord = model.getWordUntilPosition(position, wordDefRegExp).word;
 		let allWords = model.getAllUniqueWords(wordDefRegExp, currentWord);
 
@@ -275,7 +278,7 @@ export class EditorSimpleWorkerImpl implements IRequestHandler {
 	// ---- END suggest --------------------------------------------------------------------------
 
 	public navigateValueSet(modelUrl:string, range:editorCommon.IRange, up:boolean, wordDef:string, wordDefFlags:string): TPromise<IInplaceReplaceSupportResult> {
-		let model = this._models[modelUrl];
+		let model = this._getModel(modelUrl);
 		if (!model) {
 			return null;
 		}
@@ -304,7 +307,12 @@ export class EditorSimpleWorkerImpl implements IRequestHandler {
 		return new TPromise<any>((c, e) => {
 			// Use the global require to be sure to get the global config
 			(<any>self).require([moduleId], (foreignModule) => {
-				this._foreignModule = foreignModule.create(createData);
+				let ctx: IWorkerContext = {
+					getMirrorModels: ():IMirrorModel[] => {
+						return this._getModels();
+					}
+				};
+				this._foreignModule = foreignModule.create(ctx, createData);
 
 				let methods: string[] = [];
 				for (let prop in this._foreignModule) {
@@ -335,13 +343,51 @@ export class EditorSimpleWorkerImpl implements IRequestHandler {
 	// ---- END foreign module support --------------------------------------------------------------------------
 }
 
-const instance = new EditorSimpleWorkerImpl();
-
 /**
- * Get all available mirror models in this worker.
+ * @internal
  */
-export function getMirrorModels(): IMirrorModel[] {
-	return instance.getModels();
+export class EditorSimpleWorkerImpl extends BaseEditorSimpleWorker implements IRequestHandler, IDisposable {
+	_requestHandlerTrait: any;
+
+	private _models:{[uri:string]:MirrorModel;};
+
+	constructor() {
+		super();
+		this._models = Object.create(null);
+	}
+
+	public dispose(): void {
+		this._models = Object.create(null);
+	}
+
+	protected _getModel(uri:string): ICommonModel {
+		return this._models[uri];
+	}
+
+	protected _getModels(): ICommonModel[] {
+		let all: MirrorModel[] = [];
+		Object.keys(this._models).forEach((key) => all.push(this._models[key]));
+		return all;
+	}
+
+	public acceptNewModel(data:IRawModelData): void {
+		this._models[data.url] = new MirrorModel(URI.parse(data.url), data.value.lines, data.value.EOL, data.versionId);
+	}
+
+	public acceptModelChanged(strURL: string, events: editorCommon.IModelContentChangedEvent2[]): void {
+		if (!this._models[strURL]) {
+			return;
+		}
+		let model = this._models[strURL];
+		model.onEvents(events);
+	}
+
+	public acceptRemovedModel(strURL: string): void {
+		if (!this._models[strURL]) {
+			return;
+		}
+		delete this._models[strURL];
+	}
 }
 
 /**
@@ -349,15 +395,11 @@ export function getMirrorModels(): IMirrorModel[] {
  * @internal
  */
 export function create(): IRequestHandler {
-	return instance;
-}
-
-function createMonacoWorkerAPI(): typeof monaco.worker {
-	return {
-		getMirrorModels: getMirrorModels
-	};
+	return new EditorSimpleWorkerImpl();
 }
 
 var global:any = self;
-global.monaco = createMonacoBaseAPI();
-global.monaco.worker = createMonacoWorkerAPI();
+let isWebWorker = (typeof global.importScripts === 'function');
+if (isWebWorker) {
+	global.monaco = createMonacoBaseAPI();
+}

src/vs/editor/common/services/editorWorkerServiceImpl.ts

@@ -4,7 +4,7 @@
  *--------------------------------------------------------------------------------------------*/
 'use strict';
 
-import {IntervalTimer} from 'vs/base/common/async';
+import {IntervalTimer, ShallowCancelThenPromise} from 'vs/base/common/async';
 import {Disposable, IDisposable, dispose} from 'vs/base/common/lifecycle';
 import URI from 'vs/base/common/uri';
 import {TPromise} from 'vs/base/common/winjs.base';
@@ -16,6 +16,7 @@ import {IInplaceReplaceSupportResult, ILink, ISuggestResult} from 'vs/editor/com
 import {IEditorWorkerService} from 'vs/editor/common/services/editorWorkerService';
 import {IModelService} from 'vs/editor/common/services/modelService';
 import {EditorSimpleWorkerImpl} from 'vs/editor/common/services/editorSimpleWorker';
+import {logOnceWebWorkerWarning} from 'vs/base/common/worker/workerClient';
 
 /**
  * Stop syncing a model to the worker if it was not needed for 1 min.
@@ -211,31 +212,67 @@ class EditorModelManager extends Disposable {
 	}
 }
 
+interface IWorkerClient<T> {
+	getProxyObject(): TPromise<T>;
+	dispose(): void;
+}
+
+class SynchronousWorkerClient<T extends IDisposable> implements IWorkerClient<T> {
+	private _instance: T;
+	private _proxyObj: TPromise<T>;
+
+	constructor(instance:T) {
+		this._instance = instance;
+		this._proxyObj = TPromise.as(this._instance);
+	}
+
+	public dispose(): void {
+		this._instance.dispose();
+		this._instance = null;
+		this._proxyObj = null;
+	}
+
+	public getProxyObject(): TPromise<T> {
+		return new ShallowCancelThenPromise(this._proxyObj);
+	}
+}
+
 export class EditorWorkerClient extends Disposable {
 
 	private _modelService: IModelService;
-	private _worker: SimpleWorkerClient<EditorSimpleWorkerImpl>;
+	private _worker: IWorkerClient<EditorSimpleWorkerImpl>;
+	private _workerFactory: DefaultWorkerFactory;
 	private _modelManager: EditorModelManager;
 
 	constructor(modelService: IModelService) {
 		super();
 		this._modelService = modelService;
+		this._workerFactory = new DefaultWorkerFactory(/*do not use iframe*/false);
 		this._worker = null;
 		this._modelManager = null;
 	}
 
-	private _getOrCreateWorker(): SimpleWorkerClient<EditorSimpleWorkerImpl> {
+	private _getOrCreateWorker(): IWorkerClient<EditorSimpleWorkerImpl> {
 		if (!this._worker) {
-			this._worker = this._register(new SimpleWorkerClient<EditorSimpleWorkerImpl>(
-				new DefaultWorkerFactory(),
-				'vs/editor/common/services/editorSimpleWorker'
-			));
+			try {
+				this._worker = this._register(new SimpleWorkerClient<EditorSimpleWorkerImpl>(
+					this._workerFactory,
+					'vs/editor/common/services/editorSimpleWorker'
+				));
+			} catch (err) {
+				logOnceWebWorkerWarning(err);
+				this._worker = new SynchronousWorkerClient(new EditorSimpleWorkerImpl());
+			}
 		}
 		return this._worker;
 	}
 
 	protected _getProxy(): TPromise<EditorSimpleWorkerImpl> {
-		return this._getOrCreateWorker().getProxyObject();
+		return this._getOrCreateWorker().getProxyObject().then(null, (err) => {
+			logOnceWebWorkerWarning(err);
+			this._worker = new SynchronousWorkerClient(new EditorSimpleWorkerImpl());
+			return this._getOrCreateWorker().getProxyObject();
+		});
 	}
 
 	private _getOrCreateModelManager(proxy: EditorSimpleWorkerImpl): EditorModelManager {

src/vs/editor/common/standalone/standaloneBase.ts

@@ -17,7 +17,6 @@ import URI from 'vs/base/common/uri';
 export function createMonacoBaseAPI(): typeof monaco {
 	return {
 		editor: undefined,
-		worker: undefined,
 		languages: undefined,
 		CancellationTokenSource: CancellationTokenSource,
 		Emitter: Emitter,

src/vs/monaco.d.ts

@@ -4725,12 +4725,14 @@ declare module monaco.worker {
     export interface IMirrorModel {
         uri: Uri;
         version: number;
-        getText(): string;
+        getValue(): string;
     }
 
-    /**
-     * Get all available mirror models in this worker.
-     */
-    export function getMirrorModels(): IMirrorModel[];
+    export interface IWorkerContext {
+        /**
+         * Get all available mirror models in this worker.
+         */
+        getMirrorModels(): IMirrorModel[];
+    }
 
 }
\ No newline at end of file

src/vs/platform/thread/common/mainThreadService.ts

@@ -47,7 +47,7 @@ export class MainThreadService extends abstractThreadService.AbstractThreadServi
 		this._contextService = contextService;
 		this._workerModuleId = workerModuleId;
 		this._defaultWorkerCount = defaultWorkerCount;
-		this._workerFactory = new DefaultWorkerFactory();
+		this._workerFactory = new DefaultWorkerFactory(true);
 
 		if (!this.isInMainThread) {
 			throw new Error('Incorrect Service usage: this service must be used only in the main thread');
@@ -105,15 +105,11 @@ export class MainThreadService extends abstractThreadService.AbstractThreadServi
 		});
 	}
 
-	private _createWorker(): void {
-		this._workerPool.push(this._doCreateWorker());
-	}
-
 	private _shortName(major: string, minor: string): string {
 		return major.substring(major.length - 14) + '.' + minor.substr(0, 14);
 	}
 
-	private _doCreateWorker(): Worker.WorkerClient {
+	private _createWorker(isRetry:boolean = false): void {
 		let worker = new Worker.WorkerClient(
 			this._workerFactory,
 			this._workerModuleId,
@@ -131,9 +127,22 @@ export class MainThreadService extends abstractThreadService.AbstractThreadServi
 				configuration: this._contextService.getConfiguration(),
 				options: this._contextService.getOptions()
 			}
+		}).then(null, (err) => {
+			for (var i = 0; i < this._workerPool.length; i++) {
+				if (this._workerPool[i] === worker) {
+					this._workerPool.splice(i, 1);
+					break;
+				}
+			}
+			worker.dispose();
+			if (isRetry) {
+				console.warn('Creating the web worker already failed twice. Giving up!');
+			} else {
+				this._createWorker(true);
+			}
 		});
 
-		return worker;
+		this._workerPool.push(worker);
 	}
 
 	private _getWorkerIndex(obj: IThreadSynchronizableObject, affinity: ThreadAffinity): number {