feat: add overridable storage service

Author: nihonium

src/service-override/storage.ts

@@ -0,0 +1,128 @@
+import { Event } from 'vs/base/common/event'
+import { IDisposable } from 'vs/base/common/lifecycle'
+import { IStorage, IStorageDatabase, IStorageItemsChangeEvent, IUpdateRequest, Storage } from 'vs/base/parts/storage/common/storage'
+import { IEditorOverrideServices } from 'vs/editor/standalone/browser/standaloneServices'
+import { SyncDescriptor } from 'vs/platform/instantiation/common/descriptors'
+import { AbstractStorageService, IStorageService, StorageScope as VSStorageScope } from 'vs/platform/storage/common/storage'
+import { IUserDataProfile } from 'vs/platform/userDataProfile/common/userDataProfile'
+import { IAnyWorkspaceIdentifier } from 'vs/platform/workspace/common/workspace'
+
+export enum StorageScope {
+  APPLICATION = VSStorageScope.APPLICATION,
+  PROFILE = VSStorageScope.PROFILE,
+  WORKSPACE = VSStorageScope.WORKSPACE
+}
+
+export interface IStorageProvider {
+  read (scope: StorageScope): Map<string, string> | undefined
+  write (scope: StorageScope, data: Map<string, string>): Promise<void>
+  close? (scope: StorageScope): Promise<void>
+  onDidChange? (listener: (event: IStorageItemsChangeEvent) => void): IDisposable
+}
+
+class ExternalStorage extends Storage {
+  constructor (
+    scope: StorageScope,
+    provider: IStorageProvider
+  ) {
+    const items = provider.read(scope)
+
+    super(new ExternalStorageDatabase(scope, provider, items))
+
+    if (items != null) {
+      for (const [key, value] of items) {
+        this.items.set(key, value)
+      }
+    }
+  }
+}
+
+class ExternalStorageDatabase implements IStorageDatabase {
+  readonly onDidChangeItemsExternal: Event<IStorageItemsChangeEvent>
+
+  constructor (
+    private readonly scope: StorageScope,
+    private readonly provider: IStorageProvider,
+    private readonly items = new Map<string, string>()
+  ) {
+    this.onDidChangeItemsExternal = this.provider.onDidChange ?? Event.None
+  }
+
+  async getItems (): Promise<Map<string, string>> {
+    return this.items
+  }
+
+  async updateItems (request: IUpdateRequest): Promise<void> {
+    request.insert?.forEach((value, key) => this.items.set(key, value))
+
+    request.delete?.forEach(key => this.items.delete(key))
+
+    await this.provider.write(this.scope, this.items)
+  }
+
+  async close () {
+    return this.provider.close?.(this.scope)
+  }
+}
+
+class ExternalStorageService extends AbstractStorageService {
+  private readonly applicationStorage = this._register(new ExternalStorage(StorageScope.APPLICATION, this.provider))
+  private readonly profileStorage = this._register(new ExternalStorage(StorageScope.PROFILE, this.provider))
+  private readonly workspaceStorage = this._register(new ExternalStorage(StorageScope.WORKSPACE, this.provider))
+
+  constructor (protected readonly provider: IStorageProvider) {
+    super()
+
+    this._register(this.workspaceStorage.onDidChangeStorage(key => this.emitDidChangeValue(VSStorageScope.WORKSPACE, key)))
+    this._register(this.profileStorage.onDidChangeStorage(key => this.emitDidChangeValue(VSStorageScope.PROFILE, key)))
+    this._register(this.applicationStorage.onDidChangeStorage(key => this.emitDidChangeValue(VSStorageScope.APPLICATION, key)))
+  }
+
+  protected getStorage (scope: VSStorageScope): IStorage {
+    switch (scope) {
+      case VSStorageScope.APPLICATION:
+        return this.applicationStorage
+      case VSStorageScope.PROFILE:
+        return this.profileStorage
+      default:
+        return this.workspaceStorage
+    }
+  }
+
+  protected getLogDetails (scope: VSStorageScope): string | undefined {
+    switch (scope) {
+      case VSStorageScope.APPLICATION:
+        return 'External (application)'
+      case VSStorageScope.PROFILE:
+        return 'External (profile)'
+      default:
+        return 'External (workspace)'
+    }
+  }
+
+  protected async doInitialize (): Promise<void> {
+    // no-op
+  }
+
+  protected async switchToProfile (): Promise<void> {
+    // no-op
+  }
+
+  protected async switchToWorkspace (): Promise<void> {
+    // no-op
+  }
+
+  hasScope (_scope: IAnyWorkspaceIdentifier | IUserDataProfile): boolean {
+    return false
+  }
+}
+
+export default function getStorageServiceOverride (provider: IStorageProvider): IEditorOverrideServices {
+  return {
+    [IStorageService.toString()]: new SyncDescriptor(ExternalStorageService, [provider])
+  }
+}
+
+export {
+  IStorageItemsChangeEvent
+}