src/utils/performance-storage/JSONFileStorage.ts

   1 // Copyright Jerome Benoit. 2021. All Rights Reserved.
   2
   3 import Constants from '../Constants';
   4 import FileUtils from '../FileUtils';
   5 import Statistics from '../../types/Statistics';
   6 import { Storage } from './Storage';
   7 import fs from 'fs';
   8 import path from 'path';
   9
  10 export class JSONFileStorage extends Storage {
  11   private fd: number | null = null;
  12
  13   constructor(storageURI: string, logPrefix: string) {
  14     super(storageURI, logPrefix);
  15     this.dbName = path.join(path.resolve(__dirname, '../../../'), this.storageURI.pathname.replace(/(?:^\/)|(?:\/$)/g, ''));
  16   }
  17
  18   public storePerformanceStatistics(performanceStatistics: Statistics): void {
  19     this.checkPerformanceRecordsFile();
  20     fs.readFile(this.dbName, 'utf-8', (error, data) => {
  21       if (error) {
  22         FileUtils.handleFileException(this.logPrefix, Constants.PERFORMANCE_RECORDS_FILETYPE, this.dbName, error);
  23       } else {
  24         const performanceRecords: Statistics[] = data ? JSON.parse(data) as Statistics[] : [];
  25         performanceRecords.push(performanceStatistics);
  26         fs.writeFile(this.dbName, JSON.stringify(performanceRecords, null, 2), 'utf-8', (err) => {
  27           if (err) {
  28             FileUtils.handleFileException(this.logPrefix, Constants.PERFORMANCE_RECORDS_FILETYPE, this.dbName, err);
  29           }
  30         });
  31       }
  32     });
  33   }
  34
  35   public open(): void {
  36     try {
  37       this.fd = fs.openSync(this.dbName, 'a+');
  38     } catch (error) {
  39       FileUtils.handleFileException(this.logPrefix, Constants.PERFORMANCE_RECORDS_FILETYPE, this.dbName, error);
  40     }
  41   }
  42
  43   public close(): void {
  44     try {
  45       if (this.fd) {
  46         fs.closeSync(this.fd);
  47         this.fd = null;
  48       }
  49     } catch (error) {
  50       FileUtils.handleFileException(this.logPrefix, Constants.PERFORMANCE_RECORDS_FILETYPE, this.dbName, error);
  51     }
  52   }
  53
  54   private checkPerformanceRecordsFile(): void {
  55     if (!this.fd) {
  56       throw new Error(`${this.logPrefix} Performance records '${this.dbName}' file descriptor not found`);
  57     }
  58   }
  59 }