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|
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { localize } from 'vs/nls';
import { Emitter } from 'vs/base/common/event';
import { URI } from 'vs/base/common/uri';
import { assertIsDefined, withNullAsUndefined } from 'vs/base/common/types';
import { EncodingMode, ITextFileService, TextFileEditorModelState, ITextFileEditorModel, ITextFileStreamContent, ITextFileResolveOptions, IResolvedTextFileEditorModel, ITextFileSaveOptions, TextFileResolveReason, ITextFileEditorModelSaveEvent } from 'vs/workbench/services/textfile/common/textfiles';
import { IRevertOptions, SaveReason, SaveSourceRegistry } from 'vs/workbench/common/editor';
import { BaseTextEditorModel } from 'vs/workbench/common/editor/textEditorModel';
import { IWorkingCopyBackupService, IResolvedWorkingCopyBackup } from 'vs/workbench/services/workingCopy/common/workingCopyBackup';
import { IFileService, FileOperationError, FileOperationResult, FileChangesEvent, FileChangeType, IFileStatWithMetadata, ETAG_DISABLED, FileSystemProviderCapabilities, NotModifiedSinceFileOperationError } from 'vs/platform/files/common/files';
import { ILanguageService } from 'vs/editor/common/languages/language';
import { IModelService } from 'vs/editor/common/services/model';
import { timeout, TaskSequentializer } from 'vs/base/common/async';
import { ITextBufferFactory, ITextModel } from 'vs/editor/common/model';
import { ILogService } from 'vs/platform/log/common/log';
import { basename } from 'vs/base/common/path';
import { IWorkingCopyService } from 'vs/workbench/services/workingCopy/common/workingCopyService';
import { IWorkingCopyBackup, WorkingCopyCapabilities, NO_TYPE_ID, IWorkingCopyBackupMeta } from 'vs/workbench/services/workingCopy/common/workingCopy';
import { IFilesConfigurationService } from 'vs/workbench/services/filesConfiguration/common/filesConfigurationService';
import { ILabelService } from 'vs/platform/label/common/label';
import { CancellationToken, CancellationTokenSource } from 'vs/base/common/cancellation';
import { UTF8 } from 'vs/workbench/services/textfile/common/encoding';
import { createTextBufferFactoryFromStream } from 'vs/editor/common/model/textModel';
import { ILanguageDetectionService } from 'vs/workbench/services/languageDetection/common/languageDetectionWorkerService';
import { IPathService } from 'vs/workbench/services/path/common/pathService';
import { extUri } from 'vs/base/common/resources';
import { IAccessibilityService } from 'vs/platform/accessibility/common/accessibility';
import { PLAINTEXT_LANGUAGE_ID } from 'vs/editor/common/languages/modesRegistry';
import { IExtensionService } from 'vs/workbench/services/extensions/common/extensions';
interface IBackupMetaData extends IWorkingCopyBackupMeta {
mtime: number;
ctime: number;
size: number;
etag: string;
orphaned: boolean;
}
/**
* The text file editor model listens to changes to its underlying code editor model and saves these changes through the file service back to the disk.
*/
export class TextFileEditorModel extends BaseTextEditorModel implements ITextFileEditorModel {
private static readonly TEXTFILE_SAVE_ENCODING_SOURCE = SaveSourceRegistry.registerSource('textFileEncoding.source', localize('textFileCreate.source', "File Encoding Changed"));
//#region Events
private readonly _onDidChangeContent = this._register(new Emitter<void>());
readonly onDidChangeContent = this._onDidChangeContent.event;
private readonly _onDidResolve = this._register(new Emitter<TextFileResolveReason>());
readonly onDidResolve = this._onDidResolve.event;
private readonly _onDidChangeDirty = this._register(new Emitter<void>());
readonly onDidChangeDirty = this._onDidChangeDirty.event;
private readonly _onDidSaveError = this._register(new Emitter<void>());
readonly onDidSaveError = this._onDidSaveError.event;
private readonly _onDidSave = this._register(new Emitter<ITextFileEditorModelSaveEvent>());
readonly onDidSave = this._onDidSave.event;
private readonly _onDidRevert = this._register(new Emitter<void>());
readonly onDidRevert = this._onDidRevert.event;
private readonly _onDidChangeEncoding = this._register(new Emitter<void>());
readonly onDidChangeEncoding = this._onDidChangeEncoding.event;
private readonly _onDidChangeOrphaned = this._register(new Emitter<void>());
readonly onDidChangeOrphaned = this._onDidChangeOrphaned.event;
private readonly _onDidChangeReadonly = this._register(new Emitter<void>());
readonly onDidChangeReadonly = this._onDidChangeReadonly.event;
//#endregion
readonly typeId = NO_TYPE_ID; // IMPORTANT: never change this to not break existing assumptions (e.g. backups)
readonly capabilities = WorkingCopyCapabilities.None;
readonly name = basename(this.labelService.getUriLabel(this.resource));
private resourceHasExtension: boolean = !!extUri.extname(this.resource);
private contentEncoding: string | undefined; // encoding as reported from disk
private versionId = 0;
private bufferSavedVersionId: number | undefined;
private ignoreDirtyOnModelContentChange = false;
private static readonly UNDO_REDO_SAVE_PARTICIPANTS_AUTO_SAVE_THROTTLE_THRESHOLD = 500;
private lastModelContentChangeFromUndoRedo: number | undefined = undefined;
private lastResolvedFileStat: IFileStatWithMetadata | undefined;
private readonly saveSequentializer = new TaskSequentializer();
private dirty = false;
private inConflictMode = false;
private inOrphanMode = false;
private inErrorMode = false;
constructor(
readonly resource: URI,
private preferredEncoding: string | undefined, // encoding as chosen by the user
private preferredLanguageId: string | undefined, // language id as chosen by the user
@ILanguageService languageService: ILanguageService,
@IModelService modelService: IModelService,
@IFileService private readonly fileService: IFileService,
@ITextFileService private readonly textFileService: ITextFileService,
@IWorkingCopyBackupService private readonly workingCopyBackupService: IWorkingCopyBackupService,
@ILogService private readonly logService: ILogService,
@IWorkingCopyService private readonly workingCopyService: IWorkingCopyService,
@IFilesConfigurationService private readonly filesConfigurationService: IFilesConfigurationService,
@ILabelService private readonly labelService: ILabelService,
@ILanguageDetectionService languageDetectionService: ILanguageDetectionService,
@IAccessibilityService accessibilityService: IAccessibilityService,
@IPathService private readonly pathService: IPathService,
@IExtensionService private readonly extensionService: IExtensionService
) {
super(modelService, languageService, languageDetectionService, accessibilityService);
// Make known to working copy service
this._register(this.workingCopyService.registerWorkingCopy(this));
this.registerListeners();
}
private registerListeners(): void {
this._register(this.fileService.onDidFilesChange(e => this.onDidFilesChange(e)));
this._register(this.filesConfigurationService.onFilesAssociationChange(() => this.onFilesAssociationChange()));
}
private async onDidFilesChange(e: FileChangesEvent): Promise<void> {
let fileEventImpactsModel = false;
let newInOrphanModeGuess: boolean | undefined;
// If we are currently orphaned, we check if the model file was added back
if (this.inOrphanMode) {
const modelFileAdded = e.contains(this.resource, FileChangeType.ADDED);
if (modelFileAdded) {
newInOrphanModeGuess = false;
fileEventImpactsModel = true;
}
}
// Otherwise we check if the model file was deleted
else {
const modelFileDeleted = e.contains(this.resource, FileChangeType.DELETED);
if (modelFileDeleted) {
newInOrphanModeGuess = true;
fileEventImpactsModel = true;
}
}
if (fileEventImpactsModel && this.inOrphanMode !== newInOrphanModeGuess) {
let newInOrphanModeValidated: boolean = false;
if (newInOrphanModeGuess) {
// We have received reports of users seeing delete events even though the file still
// exists (network shares issue: https://github.com/microsoft/vscode/issues/13665).
// Since we do not want to mark the model as orphaned, we have to check if the
// file is really gone and not just a faulty file event.
await timeout(100);
if (this.isDisposed()) {
newInOrphanModeValidated = true;
} else {
const exists = await this.fileService.exists(this.resource);
newInOrphanModeValidated = !exists;
}
}
if (this.inOrphanMode !== newInOrphanModeValidated && !this.isDisposed()) {
this.setOrphaned(newInOrphanModeValidated);
}
}
}
private setOrphaned(orphaned: boolean): void {
if (this.inOrphanMode !== orphaned) {
this.inOrphanMode = orphaned;
this._onDidChangeOrphaned.fire();
}
}
private onFilesAssociationChange(): void {
if (!this.isResolved()) {
return;
}
const firstLineText = this.getFirstLineText(this.textEditorModel);
const languageSelection = this.getOrCreateLanguage(this.resource, this.languageService, this.preferredLanguageId, firstLineText);
this.modelService.setMode(this.textEditorModel, languageSelection);
}
override setLanguageId(languageId: string): void {
super.setLanguageId(languageId);
this.preferredLanguageId = languageId;
}
//#region Backup
async backup(token: CancellationToken): Promise<IWorkingCopyBackup> {
// Fill in metadata if we are resolved
let meta: IBackupMetaData | undefined = undefined;
if (this.lastResolvedFileStat) {
meta = {
mtime: this.lastResolvedFileStat.mtime,
ctime: this.lastResolvedFileStat.ctime,
size: this.lastResolvedFileStat.size,
etag: this.lastResolvedFileStat.etag,
orphaned: this.inOrphanMode
};
}
// Fill in content the same way we would do when
// saving the file via the text file service
// encoding support (hardcode UTF-8)
const content = await this.textFileService.getEncodedReadable(this.resource, withNullAsUndefined(this.createSnapshot()), { encoding: UTF8 });
return { meta, content };
}
//#endregion
//#region Revert
async revert(options?: IRevertOptions): Promise<void> {
if (!this.isResolved()) {
return;
}
// Unset flags
const wasDirty = this.dirty;
const undo = this.doSetDirty(false);
// Force read from disk unless reverting soft
const softUndo = options?.soft;
if (!softUndo) {
try {
await this.forceResolveFromFile();
} catch (error) {
// FileNotFound means the file got deleted meanwhile, so ignore it
if ((<FileOperationError>error).fileOperationResult !== FileOperationResult.FILE_NOT_FOUND) {
// Set flags back to previous values, we are still dirty if revert failed
undo();
throw error;
}
}
}
// Emit file change event
this._onDidRevert.fire();
// Emit dirty change event
if (wasDirty) {
this._onDidChangeDirty.fire();
}
}
//#endregion
//#region Resolve
override async resolve(options?: ITextFileResolveOptions): Promise<void> {
this.trace('[text file model] resolve() - enter');
// Return early if we are disposed
if (this.isDisposed()) {
this.trace('[text file model] resolve() - exit - without resolving because model is disposed');
return;
}
// Unless there are explicit contents provided, it is important that we do not
// resolve a model that is dirty or is in the process of saving to prevent data
// loss.
if (!options?.contents && (this.dirty || this.saveSequentializer.hasPending())) {
this.trace('[text file model] resolve() - exit - without resolving because model is dirty or being saved');
return;
}
return this.doResolve(options);
}
private async doResolve(options?: ITextFileResolveOptions): Promise<void> {
// First check if we have contents to use for the model
if (options?.contents) {
return this.resolveFromBuffer(options.contents, options);
}
// Second, check if we have a backup to resolve from (only for new models)
const isNewModel = !this.isResolved();
if (isNewModel) {
const resolvedFromBackup = await this.resolveFromBackup(options);
if (resolvedFromBackup) {
return;
}
}
// Finally, resolve from file resource
return this.resolveFromFile(options);
}
private async resolveFromBuffer(buffer: ITextBufferFactory, options?: ITextFileResolveOptions): Promise<void> {
this.trace('[text file model] resolveFromBuffer()');
// Try to resolve metdata from disk
let mtime: number;
let ctime: number;
let size: number;
let etag: string;
try {
const metadata = await this.fileService.stat(this.resource);
mtime = metadata.mtime;
ctime = metadata.ctime;
size = metadata.size;
etag = metadata.etag;
// Clear orphaned state when resolving was successful
this.setOrphaned(false);
} catch (error) {
// Put some fallback values in error case
mtime = Date.now();
ctime = Date.now();
size = 0;
etag = ETAG_DISABLED;
// Apply orphaned state based on error code
this.setOrphaned(error.fileOperationResult === FileOperationResult.FILE_NOT_FOUND);
}
const preferredEncoding = await this.textFileService.encoding.getPreferredWriteEncoding(this.resource, this.preferredEncoding);
// Resolve with buffer
this.resolveFromContent({
resource: this.resource,
name: this.name,
mtime,
ctime,
size,
etag,
value: buffer,
encoding: preferredEncoding.encoding,
readonly: false
}, true /* dirty (resolved from buffer) */, options);
}
private async resolveFromBackup(options?: ITextFileResolveOptions): Promise<boolean> {
// Resolve backup if any
const backup = await this.workingCopyBackupService.resolve<IBackupMetaData>(this);
// Resolve preferred encoding if we need it
let encoding = UTF8;
if (backup) {
encoding = (await this.textFileService.encoding.getPreferredWriteEncoding(this.resource, this.preferredEncoding)).encoding;
}
// Abort if someone else managed to resolve the model by now
let isNewModel = !this.isResolved();
if (!isNewModel) {
this.trace('[text file model] resolveFromBackup() - exit - without resolving because previously new model got created meanwhile');
return true; // imply that resolving has happened in another operation
}
// Try to resolve from backup if we have any
if (backup) {
await this.doResolveFromBackup(backup, encoding, options);
return true;
}
// Otherwise signal back that resolving did not happen
return false;
}
private async doResolveFromBackup(backup: IResolvedWorkingCopyBackup<IBackupMetaData>, encoding: string, options?: ITextFileResolveOptions): Promise<void> {
this.trace('[text file model] doResolveFromBackup()');
// Resolve with backup
this.resolveFromContent({
resource: this.resource,
name: this.name,
mtime: backup.meta ? backup.meta.mtime : Date.now(),
ctime: backup.meta ? backup.meta.ctime : Date.now(),
size: backup.meta ? backup.meta.size : 0,
etag: backup.meta ? backup.meta.etag : ETAG_DISABLED, // etag disabled if unknown!
value: await createTextBufferFactoryFromStream(await this.textFileService.getDecodedStream(this.resource, backup.value, { encoding: UTF8 })),
encoding,
readonly: false
}, true /* dirty (resolved from backup) */, options);
// Restore orphaned flag based on state
if (backup.meta?.orphaned) {
this.setOrphaned(true);
}
}
private async resolveFromFile(options?: ITextFileResolveOptions): Promise<void> {
this.trace('[text file model] resolveFromFile()');
const forceReadFromFile = options?.forceReadFromFile;
const allowBinary = this.isResolved() /* always allow if we resolved previously */ || options?.allowBinary;
// Decide on etag
let etag: string | undefined;
if (forceReadFromFile) {
etag = ETAG_DISABLED; // disable ETag if we enforce to read from disk
} else if (this.lastResolvedFileStat) {
etag = this.lastResolvedFileStat.etag; // otherwise respect etag to support caching
}
// Remember current version before doing any long running operation
// to ensure we are not changing a model that was changed meanwhile
const currentVersionId = this.versionId;
// Resolve Content
try {
const content = await this.textFileService.readStream(this.resource, { acceptTextOnly: !allowBinary, etag, encoding: this.preferredEncoding });
// Clear orphaned state when resolving was successful
this.setOrphaned(false);
// Return early if the model content has changed
// meanwhile to prevent loosing any changes
if (currentVersionId !== this.versionId) {
this.trace('[text file model] resolveFromFile() - exit - without resolving because model content changed');
return;
}
return this.resolveFromContent(content, false /* not dirty (resolved from file) */, options);
} catch (error) {
const result = error.fileOperationResult;
// Apply orphaned state based on error code
this.setOrphaned(result === FileOperationResult.FILE_NOT_FOUND);
// NotModified status is expected and can be handled gracefully
// if we are resolved. We still want to update our last resolved
// stat to e.g. detect changes to the file's readonly state
if (this.isResolved() && result === FileOperationResult.FILE_NOT_MODIFIED_SINCE) {
if (error instanceof NotModifiedSinceFileOperationError) {
this.updateLastResolvedFileStat(error.stat);
}
return;
}
// Unless we are forced to read from the file, Ignore when a model has been resolved once
// and the file was deleted meanwhile. Since we already have the model resolved, we can return
// to this state and update the orphaned flag to indicate that this model has no version on
// disk anymore.
if (this.isResolved() && result === FileOperationResult.FILE_NOT_FOUND && !forceReadFromFile) {
return;
}
// Otherwise bubble up the error
throw error;
}
}
private resolveFromContent(content: ITextFileStreamContent, dirty: boolean, options?: ITextFileResolveOptions): void {
this.trace('[text file model] resolveFromContent() - enter');
// Return early if we are disposed
if (this.isDisposed()) {
this.trace('[text file model] resolveFromContent() - exit - because model is disposed');
return;
}
// Update our resolved disk stat model
this.updateLastResolvedFileStat({
resource: this.resource,
name: content.name,
mtime: content.mtime,
ctime: content.ctime,
size: content.size,
etag: content.etag,
readonly: content.readonly,
isFile: true,
isDirectory: false,
isSymbolicLink: false,
children: undefined
});
// Keep the original encoding to not loose it when saving
const oldEncoding = this.contentEncoding;
this.contentEncoding = content.encoding;
// Handle events if encoding changed
if (this.preferredEncoding) {
this.updatePreferredEncoding(this.contentEncoding); // make sure to reflect the real encoding of the file (never out of sync)
} else if (oldEncoding !== this.contentEncoding) {
this._onDidChangeEncoding.fire();
}
// Update Existing Model
if (this.textEditorModel) {
this.doUpdateTextModel(content.value);
}
// Create New Model
else {
this.doCreateTextModel(content.resource, content.value);
}
// Update model dirty flag. This is very important to call
// in both cases of dirty or not because it conditionally
// updates the `bufferSavedVersionId` to determine the
// version when to consider the model as saved again (e.g.
// when undoing back to the saved state)
this.setDirty(!!dirty);
// Emit as event
this._onDidResolve.fire(options?.reason ?? TextFileResolveReason.OTHER);
}
private doCreateTextModel(resource: URI, value: ITextBufferFactory): void {
this.trace('[text file model] doCreateTextModel()');
// Create model
const textModel = this.createTextEditorModel(value, resource, this.preferredLanguageId);
// Model Listeners
this.installModelListeners(textModel);
// Detect language from content
this.autoDetectLanguage();
}
private doUpdateTextModel(value: ITextBufferFactory): void {
this.trace('[text file model] doUpdateTextModel()');
// Update model value in a block that ignores content change events for dirty tracking
this.ignoreDirtyOnModelContentChange = true;
try {
this.updateTextEditorModel(value, this.preferredLanguageId);
} finally {
this.ignoreDirtyOnModelContentChange = false;
}
}
private installModelListeners(model: ITextModel): void {
// See https://github.com/microsoft/vscode/issues/30189
// This code has been extracted to a different method because it caused a memory leak
// where `value` was captured in the content change listener closure scope.
// Listen to text model events
this._register(model.onDidChangeContent(e => this.onModelContentChanged(model, e.isUndoing || e.isRedoing)));
this._register(model.onDidChangeLanguage(e => this.onMaybeShouldChangeEncoding())); // detect possible encoding change via language specific settings
}
private onModelContentChanged(model: ITextModel, isUndoingOrRedoing: boolean): void {
this.trace(`[text file model] onModelContentChanged() - enter`);
// In any case increment the version id because it tracks the textual content state of the model at all times
this.versionId++;
this.trace(`[text file model] onModelContentChanged() - new versionId ${this.versionId}`);
// Remember when the user changed the model through a undo/redo operation.
// We need this information to throttle save participants to fix
// https://github.com/microsoft/vscode/issues/102542
if (isUndoingOrRedoing) {
this.lastModelContentChangeFromUndoRedo = Date.now();
}
// We mark check for a dirty-state change upon model content change, unless:
// - explicitly instructed to ignore it (e.g. from model.resolve())
// - the model is readonly (in that case we never assume the change was done by the user)
if (!this.ignoreDirtyOnModelContentChange && !this.isReadonly()) {
// The contents changed as a matter of Undo and the version reached matches the saved one
// In this case we clear the dirty flag and emit a SAVED event to indicate this state.
if (model.getAlternativeVersionId() === this.bufferSavedVersionId) {
this.trace('[text file model] onModelContentChanged() - model content changed back to last saved version');
// Clear flags
const wasDirty = this.dirty;
this.setDirty(false);
// Emit revert event if we were dirty
if (wasDirty) {
this._onDidRevert.fire();
}
}
// Otherwise the content has changed and we signal this as becoming dirty
else {
this.trace('[text file model] onModelContentChanged() - model content changed and marked as dirty');
// Mark as dirty
this.setDirty(true);
}
}
// Emit as event
this._onDidChangeContent.fire();
// Detect language from content
this.autoDetectLanguage();
}
protected override async autoDetectLanguage(): Promise<void> {
// Wait to be ready to detect language
await this.extensionService?.whenInstalledExtensionsRegistered();
// Only perform language detection conditionally
const languageId = this.getLanguageId();
if (
this.resource.scheme === this.pathService.defaultUriScheme && // make sure to not detect language for non-user visible documents
(!languageId || languageId === PLAINTEXT_LANGUAGE_ID) && // only run on files with plaintext language set or no language set at all
!this.resourceHasExtension // only run if this particular file doesn't have an extension
) {
return super.autoDetectLanguage();
}
}
private async forceResolveFromFile(): Promise<void> {
if (this.isDisposed()) {
return; // return early when the model is invalid
}
// We go through the text file service to make
// sure this kind of `resolve` is properly
// running in sequence with any other running
// `resolve` if any, including subsequent runs
// that are triggered right after.
await this.textFileService.files.resolve(this.resource, {
reload: { async: false },
forceReadFromFile: true
});
}
//#endregion
//#region Dirty
isDirty(): this is IResolvedTextFileEditorModel {
return this.dirty;
}
setDirty(dirty: boolean): void {
if (!this.isResolved()) {
return; // only resolved models can be marked dirty
}
// Track dirty state and version id
const wasDirty = this.dirty;
this.doSetDirty(dirty);
// Emit as Event if dirty changed
if (dirty !== wasDirty) {
this._onDidChangeDirty.fire();
}
}
private doSetDirty(dirty: boolean): () => void {
const wasDirty = this.dirty;
const wasInConflictMode = this.inConflictMode;
const wasInErrorMode = this.inErrorMode;
const oldBufferSavedVersionId = this.bufferSavedVersionId;
if (!dirty) {
this.dirty = false;
this.inConflictMode = false;
this.inErrorMode = false;
this.updateSavedVersionId();
} else {
this.dirty = true;
}
// Return function to revert this call
return () => {
this.dirty = wasDirty;
this.inConflictMode = wasInConflictMode;
this.inErrorMode = wasInErrorMode;
this.bufferSavedVersionId = oldBufferSavedVersionId;
};
}
//#endregion
//#region Save
async save(options: ITextFileSaveOptions = Object.create(null)): Promise<boolean> {
if (!this.isResolved()) {
return false;
}
if (this.isReadonly()) {
this.trace('[text file model] save() - ignoring request for readonly resource');
return false; // if model is readonly we do not attempt to save at all
}
if (
(this.hasState(TextFileEditorModelState.CONFLICT) || this.hasState(TextFileEditorModelState.ERROR)) &&
(options.reason === SaveReason.AUTO || options.reason === SaveReason.FOCUS_CHANGE || options.reason === SaveReason.WINDOW_CHANGE)
) {
this.trace('[text file model] save() - ignoring auto save request for model that is in conflict or error');
return false; // if model is in save conflict or error, do not save unless save reason is explicit
}
// Actually do save and log
this.trace('[text file model] save() - enter');
await this.doSave(options);
this.trace('[text file model] save() - exit');
return this.hasState(TextFileEditorModelState.SAVED);
}
private async doSave(options: ITextFileSaveOptions): Promise<void> {
if (typeof options.reason !== 'number') {
options.reason = SaveReason.EXPLICIT;
}
let versionId = this.versionId;
this.trace(`[text file model] doSave(${versionId}) - enter with versionId ${versionId}`);
// Lookup any running pending save for this versionId and return it if found
//
// Scenario: user invoked the save action multiple times quickly for the same contents
// while the save was not yet finished to disk
//
if (this.saveSequentializer.hasPending(versionId)) {
this.trace(`[text file model] doSave(${versionId}) - exit - found a pending save for versionId ${versionId}`);
return this.saveSequentializer.pending;
}
// Return early if not dirty (unless forced)
//
// Scenario: user invoked save action even though the model is not dirty
if (!options.force && !this.dirty) {
this.trace(`[text file model] doSave(${versionId}) - exit - because not dirty and/or versionId is different (this.isDirty: ${this.dirty}, this.versionId: ${this.versionId})`);
return;
}
// Return if currently saving by storing this save request as the next save that should happen.
// Never ever must 2 saves execute at the same time because this can lead to dirty writes and race conditions.
//
// Scenario A: auto save was triggered and is currently busy saving to disk. this takes long enough that another auto save
// kicks in.
// Scenario B: save is very slow (e.g. network share) and the user manages to change the buffer and trigger another save
// while the first save has not returned yet.
//
if (this.saveSequentializer.hasPending()) {
this.trace(`[text file model] doSave(${versionId}) - exit - because busy saving`);
// Indicate to the save sequentializer that we want to
// cancel the pending operation so that ours can run
// before the pending one finishes.
// Currently this will try to cancel pending save
// participants but never a pending save.
this.saveSequentializer.cancelPending();
// Register this as the next upcoming save and return
return this.saveSequentializer.setNext(() => this.doSave(options));
}
// Push all edit operations to the undo stack so that the user has a chance to
// Ctrl+Z back to the saved version.
if (this.isResolved()) {
this.textEditorModel.pushStackElement();
}
const saveCancellation = new CancellationTokenSource();
return this.saveSequentializer.setPending(versionId, (async () => {
// A save participant can still change the model now and since we are so close to saving
// we do not want to trigger another auto save or similar, so we block this
// In addition we update our version right after in case it changed because of a model change
//
// Save participants can also be skipped through API.
if (this.isResolved() && !options.skipSaveParticipants) {
try {
// Measure the time it took from the last undo/redo operation to this save. If this
// time is below `UNDO_REDO_SAVE_PARTICIPANTS_THROTTLE_THRESHOLD`, we make sure to
// delay the save participant for the remaining time if the reason is auto save.
//
// This fixes the following issue:
// - the user has configured auto save with delay of 100ms or shorter
// - the user has a save participant enabled that modifies the file on each save
// - the user types into the file and the file gets saved
// - the user triggers undo operation
// - this will undo the save participant change but trigger the save participant right after
// - the user has no chance to undo over the save participant
//
// Reported as: https://github.com/microsoft/vscode/issues/102542
if (options.reason === SaveReason.AUTO && typeof this.lastModelContentChangeFromUndoRedo === 'number') {
const timeFromUndoRedoToSave = Date.now() - this.lastModelContentChangeFromUndoRedo;
if (timeFromUndoRedoToSave < TextFileEditorModel.UNDO_REDO_SAVE_PARTICIPANTS_AUTO_SAVE_THROTTLE_THRESHOLD) {
await timeout(TextFileEditorModel.UNDO_REDO_SAVE_PARTICIPANTS_AUTO_SAVE_THROTTLE_THRESHOLD - timeFromUndoRedoToSave);
}
}
// Run save participants unless save was cancelled meanwhile
if (!saveCancellation.token.isCancellationRequested) {
await this.textFileService.files.runSaveParticipants(this, { reason: options.reason ?? SaveReason.EXPLICIT }, saveCancellation.token);
}
} catch (error) {
this.logService.error(`[text file model] runSaveParticipants(${versionId}) - resulted in an error: ${error.toString()}`, this.resource.toString());
}
}
// It is possible that a subsequent save is cancelling this
// running save. As such we return early when we detect that
// However, we do not pass the token into the file service
// because that is an atomic operation currently without
// cancellation support, so we dispose the cancellation if
// it was not cancelled yet.
if (saveCancellation.token.isCancellationRequested) {
return;
} else {
saveCancellation.dispose();
}
// We have to protect against being disposed at this point. It could be that the save() operation
// was triggerd followed by a dispose() operation right after without waiting. Typically we cannot
// be disposed if we are dirty, but if we are not dirty, save() and dispose() can still be triggered
// one after the other without waiting for the save() to complete. If we are disposed(), we risk
// saving contents to disk that are stale (see https://github.com/microsoft/vscode/issues/50942).
// To fix this issue, we will not store the contents to disk when we got disposed.
if (this.isDisposed()) {
return;
}
// We require a resolved model from this point on, since we are about to write data to disk.
if (!this.isResolved()) {
return;
}
// update versionId with its new value (if pre-save changes happened)
versionId = this.versionId;
// Clear error flag since we are trying to save again
this.inErrorMode = false;
// Save to Disk. We mark the save operation as currently pending with
// the latest versionId because it might have changed from a save
// participant triggering
this.trace(`[text file model] doSave(${versionId}) - before write()`);
const lastResolvedFileStat = assertIsDefined(this.lastResolvedFileStat);
const resolvedTextFileEditorModel = this;
return this.saveSequentializer.setPending(versionId, (async () => {
try {
const stat = await this.textFileService.write(lastResolvedFileStat.resource, resolvedTextFileEditorModel.createSnapshot(), {
mtime: lastResolvedFileStat.mtime,
encoding: this.getEncoding(),
etag: (options.ignoreModifiedSince || !this.filesConfigurationService.preventSaveConflicts(lastResolvedFileStat.resource, resolvedTextFileEditorModel.getLanguageId())) ? ETAG_DISABLED : lastResolvedFileStat.etag,
unlock: options.writeUnlock,
writeElevated: options.writeElevated
});
this.handleSaveSuccess(stat, versionId, options);
} catch (error) {
this.handleSaveError(error, versionId, options);
}
})());
})(), () => saveCancellation.cancel());
}
private handleSaveSuccess(stat: IFileStatWithMetadata, versionId: number, options: ITextFileSaveOptions): void {
// Updated resolved stat with updated stat
this.updateLastResolvedFileStat(stat);
// Update dirty state unless model has changed meanwhile
if (versionId === this.versionId) {
this.trace(`[text file model] handleSaveSuccess(${versionId}) - setting dirty to false because versionId did not change`);
this.setDirty(false);
} else {
this.trace(`[text file model] handleSaveSuccess(${versionId}) - not setting dirty to false because versionId did change meanwhile`);
}
// Update orphan state given save was successful
this.setOrphaned(false);
// Emit Save Event
this._onDidSave.fire({ reason: options.reason, stat, source: options.source });
}
private handleSaveError(error: Error, versionId: number, options: ITextFileSaveOptions): void {
(options.ignoreErrorHandler ? this.logService.trace : this.logService.error).apply(this.logService, [`[text file model] handleSaveError(${versionId}) - exit - resulted in a save error: ${error.toString()}`, this.resource.toString()]);
// Return early if the save() call was made asking to
// handle the save error itself.
if (options.ignoreErrorHandler) {
throw error;
}
// In any case of an error, we mark the model as dirty to prevent data loss
// It could be possible that the write corrupted the file on disk (e.g. when
// an error happened after truncating the file) and as such we want to preserve
// the model contents to prevent data loss.
this.setDirty(true);
// Flag as error state in the model
this.inErrorMode = true;
// Look out for a save conflict
if ((<FileOperationError>error).fileOperationResult === FileOperationResult.FILE_MODIFIED_SINCE) {
this.inConflictMode = true;
}
// Show to user
this.textFileService.files.saveErrorHandler.onSaveError(error, this);
// Emit as event
this._onDidSaveError.fire();
}
private updateSavedVersionId(): void {
// we remember the models alternate version id to remember when the version
// of the model matches with the saved version on disk. we need to keep this
// in order to find out if the model changed back to a saved version (e.g.
// when undoing long enough to reach to a version that is saved and then to
// clear the dirty flag)
if (this.isResolved()) {
this.bufferSavedVersionId = this.textEditorModel.getAlternativeVersionId();
}
}
private updateLastResolvedFileStat(newFileStat: IFileStatWithMetadata): void {
const oldReadonly = this.isReadonly();
// First resolve - just take
if (!this.lastResolvedFileStat) {
this.lastResolvedFileStat = newFileStat;
}
// Subsequent resolve - make sure that we only assign it if the mtime is equal or has advanced.
// This prevents race conditions from resolving and saving. If a save comes in late after a revert
// was called, the mtime could be out of sync.
else if (this.lastResolvedFileStat.mtime <= newFileStat.mtime) {
this.lastResolvedFileStat = newFileStat;
}
// Signal that the readonly state changed
if (this.isReadonly() !== oldReadonly) {
this._onDidChangeReadonly.fire();
}
}
//#endregion
hasState(state: TextFileEditorModelState): boolean {
switch (state) {
case TextFileEditorModelState.CONFLICT:
return this.inConflictMode;
case TextFileEditorModelState.DIRTY:
return this.dirty;
case TextFileEditorModelState.ERROR:
return this.inErrorMode;
case TextFileEditorModelState.ORPHAN:
return this.inOrphanMode;
case TextFileEditorModelState.PENDING_SAVE:
return this.saveSequentializer.hasPending();
case TextFileEditorModelState.SAVED:
return !this.dirty;
}
}
async joinState(state: TextFileEditorModelState.PENDING_SAVE): Promise<void> {
return this.saveSequentializer.pending;
}
override getLanguageId(this: IResolvedTextFileEditorModel): string;
override getLanguageId(): string | undefined;
override getLanguageId(): string | undefined {
if (this.textEditorModel) {
return this.textEditorModel.getLanguageId();
}
return this.preferredLanguageId;
}
//#region Encoding
private async onMaybeShouldChangeEncoding(): Promise<void> {
// This is a bit of a hack but there is a narrow case where
// per-language configured encodings are not working:
//
// On startup we may not yet have all languages resolved so
// we pick a wrong encoding. We never used to re-apply the
// encoding when the language was then resolved, because that
// is an operation that is will have to fetch the contents
// again from disk.
//
// To mitigate this issue, when we detect the model language
// changes, we see if there is a specific encoding configured
// for the new language and apply it, only if the model is
// not dirty and only if the encoding was not explicitly set.
//
// (see https://github.com/microsoft/vscode/issues/127936)
if (this.hasEncodingSetExplicitly) {
return; // never change the user's choice of encoding
}
const { encoding } = await this.textFileService.encoding.getPreferredReadEncoding(this.resource);
if (typeof encoding !== 'string' || !this.isNewEncoding(encoding)) {
return; // return early if encoding is invalid or did not change
}
if (this.isDirty()) {
return; // return early to prevent accident saves in this case
}
this.logService.info(`Adjusting encoding based on configured language override to '${encoding}' for ${this.resource.toString(true)}.`);
// Re-open with new encoding
return this.setEncodingInternal(encoding, EncodingMode.Decode);
}
private hasEncodingSetExplicitly: boolean = false;
setEncoding(encoding: string, mode: EncodingMode): Promise<void> {
// Remember that an explicit encoding was set
this.hasEncodingSetExplicitly = true;
return this.setEncodingInternal(encoding, mode);
}
private async setEncodingInternal(encoding: string, mode: EncodingMode): Promise<void> {
// Encode: Save with encoding
if (mode === EncodingMode.Encode) {
this.updatePreferredEncoding(encoding);
// Save
if (!this.isDirty()) {
this.versionId++; // needs to increment because we change the model potentially
this.setDirty(true);
}
if (!this.inConflictMode) {
await this.save({ source: TextFileEditorModel.TEXTFILE_SAVE_ENCODING_SOURCE });
}
}
// Decode: Resolve with encoding
else {
if (!this.isNewEncoding(encoding)) {
return; // return early if the encoding is already the same
}
if (this.isDirty() && !this.inConflictMode) {
await this.save();
}
this.updatePreferredEncoding(encoding);
await this.forceResolveFromFile();
}
}
updatePreferredEncoding(encoding: string | undefined): void {
if (!this.isNewEncoding(encoding)) {
return;
}
this.preferredEncoding = encoding;
// Emit
this._onDidChangeEncoding.fire();
}
private isNewEncoding(encoding: string | undefined): boolean {
if (this.preferredEncoding === encoding) {
return false; // return early if the encoding is already the same
}
if (!this.preferredEncoding && this.contentEncoding === encoding) {
return false; // also return if we don't have a preferred encoding but the content encoding is already the same
}
return true;
}
getEncoding(): string | undefined {
return this.preferredEncoding || this.contentEncoding;
}
//#endregion
private trace(msg: string): void {
this.logService.trace(msg, this.resource.toString());
}
override isResolved(): this is IResolvedTextFileEditorModel {
return !!this.textEditorModel;
}
override isReadonly(): boolean {
return this.lastResolvedFileStat?.readonly || this.fileService.hasCapability(this.resource, FileSystemProviderCapabilities.Readonly);
}
override dispose(): void {
this.trace('[text file model] dispose()');
this.inConflictMode = false;
this.inOrphanMode = false;
this.inErrorMode = false;
super.dispose();
}
}
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