refactor: applied changes for pull request

[e-mobility-charging-stations-simulator.git] / src / utils / FileUtils.ts

import fs from 'node:fs';

import { ErrorUtils } from './ErrorUtils';
import { logger } from './Logger';
import { Utils } from './Utils';
import type { FileType, JsonType } from '../types';

export class FileUtils {
  private constructor() {
    // This is intentional
  }

  public static watchJsonFile<T extends JsonType>(
    file: string,
    fileType: FileType,
    logPrefix: string,
    refreshedVariable?: T,
    listener: fs.WatchListener<string> = (event, filename) => {
      if (Utils.isNotEmptyString(filename) && event === 'change') {
        try {
          logger.debug(`${logPrefix} ${fileType} file ${file} have changed, reload`);
          refreshedVariable && (refreshedVariable = JSON.parse(fs.readFileSync(file, 'utf8')) as T);
        } catch (error) {
          ErrorUtils.handleFileException(
            file,
            fileType,
            error as NodeJS.ErrnoException,
            logPrefix,
            {
              throwError: false,
            }
          );
        }
      }
    }
  ): fs.FSWatcher | undefined {
    if (Utils.isNotEmptyString(file)) {
      try {
        return fs.watch(file, listener);
      } catch (error) {
        ErrorUtils.handleFileException(file, fileType, error as NodeJS.ErrnoException, logPrefix, {
          throwError: false,
        });
      }
    } else {
      logger.info(`${logPrefix} No ${fileType} file to watch given. Not monitoring its changes`);
    }
  }
}