Class LocalStorageStore

src/backend/LocalStorage.ts:31–78

 * A synchronous key-value store backed by localStorage.
 */
export class LocalStorageStore implements SyncKeyValueStore, SimpleSyncStore {
  public name(): string {
    return LocalStorageFileSystem.Name;
  }

  public clear(): void {
    global.localStorage.clear();
  }

  public beginTransaction(type: string): SyncKeyValueRWTransaction {
    // No need to differentiate.
    return new SimpleSyncRWTransaction(this);
  }

  public get(key: string): Buffer | undefined {
    try {
      const data = global.localStorage.getItem(key);
      if (data !== null) {
        return Buffer.from(data, binaryEncoding);
      }
    } catch (e) {
      // Do nothing.
    }
    // Key doesn't exist, or a failure occurred.
    return undefined;
  }

  public put(key: string, data: Buffer, overwrite: boolean): boolean {
    try {
      if (!overwrite && global.localStorage.getItem(key) !== null) {
        // Don't want to overwrite the key!
        return false;
      }
      global.localStorage.setItem(key, data.toString(binaryEncoding));
      return true;
    } catch (e) {
      throw new ApiError(ErrorCode.ENOSPC, "LocalStorage is full.");
    }
  }

  public del(key: string): void {
    try {
      global.localStorage.removeItem(key);
    } catch (e) {
      throw new ApiError(ErrorCode.EIO, "Unable to delete key " + key + ": " + e);
    }
  }
}

/**
 * A synchronous file system backed by localStorage. Connects our