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Merge pull request #19537 from Microsoft/tyriar_16509
Perform hot exit backup/discard operations in a queue
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commit
a5b8c44a13
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@ -10,6 +10,7 @@ import * as crypto from 'crypto';
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import pfs = require('vs/base/node/pfs');
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import * as platform from 'vs/base/common/platform';
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import Uri from 'vs/base/common/uri';
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import { Queue } from 'vs/base/common/async';
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import { IBackupFileService, BACKUP_FILE_UPDATE_OPTIONS } from 'vs/workbench/services/backup/common/backup';
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import { IBackupService } from 'vs/platform/backup/common/backup';
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import { IEnvironmentService } from 'vs/platform/environment/common/environment';
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@ -97,6 +98,11 @@ export class BackupFileService implements IBackupFileService {
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private isShuttingDown: boolean;
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private backupWorkspacePath: string;
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private ready: TPromise<IBackupFilesModel>;
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/**
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* Ensure IO operations on individual files are performed in order, this could otherwise lead
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* to unexpected behavior when backups are persisted and discarded in the wrong order.
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*/
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private ioOperationQueues: { [path: string]: Queue<void> };
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constructor(
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@IEnvironmentService private environmentService: IEnvironmentService,
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@ -106,6 +112,7 @@ export class BackupFileService implements IBackupFileService {
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) {
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this.isShuttingDown = false;
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this.ready = this.init(windowService.getCurrentWindowId());
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this.ioOperationQueues = {};
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}
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private get backupEnabled(): boolean {
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@ -173,7 +180,9 @@ export class BackupFileService implements IBackupFileService {
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// Add metadata to top of file
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content = `${resource.toString()}${BackupFileService.META_MARKER}${content}`;
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return this.fileService.updateContent(backupResource, content, BACKUP_FILE_UPDATE_OPTIONS).then(() => model.add(backupResource, versionId));
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return this.getResourceIOQueue(backupResource).queue(() => {
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return this.fileService.updateContent(backupResource, content, BACKUP_FILE_UPDATE_OPTIONS).then(() => model.add(backupResource, versionId));
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});
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});
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}
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@ -184,10 +193,25 @@ export class BackupFileService implements IBackupFileService {
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return void 0;
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}
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return pfs.del(backupResource.fsPath).then(() => model.remove(backupResource));
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return this.getResourceIOQueue(backupResource).queue(() => {
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return pfs.del(backupResource.fsPath).then(() => model.remove(backupResource));
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});
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});
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}
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private getResourceIOQueue(resource: Uri) {
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const key = resource.toString();
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if (!this.ioOperationQueues[key]) {
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const queue = new Queue<void>();
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queue.onFinished(() => {
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queue.dispose();
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delete this.ioOperationQueues[key];
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});
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this.ioOperationQueues[key] = queue;
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}
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return this.ioOperationQueues[key];
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}
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public discardAllWorkspaceBackups(): TPromise<void> {
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this.isShuttingDown = true;
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