pigallery2/backend/model/memory/GalleryManager.ts

import {DirectoryDTO, NotModifiedDirectoryDTO} from "../../../common/entities/DirectoryDTO";
import {IGalleryManager} from "../interfaces/IGalleryManager";
import * as path from "path";
import * as fs from "fs";
import {DiskManager} from "../DiskManger";
import {ProjectPath} from "../../ProjectPath";
import {Config} from "../../../common/config/private/Config";

export class GalleryManager implements IGalleryManager {

  public listDirectory(relativeDirectoryName: string, knownLastModified?: number, knownLastScanned?: number): Promise<DirectoryDTO | NotModifiedDirectoryDTO> {
    //If it seems that the content did not changed, do not work on it
    if (knownLastModified && knownLastScanned) {
      const stat = fs.statSync(path.join(ProjectPath.ImageFolder, relativeDirectoryName));
      const lastModified = Math.max(stat.ctime.getTime(), stat.mtime.getTime());
      if (Date.now() - knownLastScanned <= Config.Server.cachedFolderTimeout && lastModified == knownLastModified) {
        return Promise.resolve(<NotModifiedDirectoryDTO>{notModified: true});
      }
    }
    return DiskManager.scanDirectory(relativeDirectoryName);
  }

}