src/utils/FileUtils.ts

   1 import fs from 'node:fs';
   2
   3 import { ErrorUtils } from './ErrorUtils';
   4 import { logger } from './Logger';
   5 import { Utils } from './Utils';
   6 import type { FileType, JsonType } from '../types';
   7
   8 export class FileUtils {
   9   private constructor() {
  10     // This is intentional
  11   }
  12
  13   public static watchJsonFile<T extends JsonType>(
  14     file: string,
  15     fileType: FileType,
  16     logPrefix: string,
  17     refreshedVariable?: T,
  18     listener: fs.WatchListener<string> = (event, filename) => {
  19       if (Utils.isNotEmptyString(filename) && event === 'change') {
  20         try {
  21           logger.debug(`${logPrefix} ${fileType} file ${file} have changed, reload`);
  22           refreshedVariable && (refreshedVariable = JSON.parse(fs.readFileSync(file, 'utf8')) as T);
  23         } catch (error) {
  24           ErrorUtils.handleFileException(
  25             file,
  26             fileType,
  27             error as NodeJS.ErrnoException,
  28             logPrefix,
  29             {
  30               throwError: false,
  31             }
  32           );
  33         }
  34       }
  35     }
  36   ): fs.FSWatcher | undefined {
  37     if (Utils.isNotEmptyString(file)) {
  38       try {
  39         return fs.watch(file, listener);
  40       } catch (error) {
  41         ErrorUtils.handleFileException(file, fileType, error as NodeJS.ErrnoException, logPrefix, {
  42           throwError: false,
  43         });
  44       }
  45     } else {
  46       logger.info(`${logPrefix} No ${fileType} file to watch given. Not monitoring its changes`);
  47     }
  48   }
  49 }