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data.js
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data.js
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/*
* Title: Data File
* Description: Data related file to deal with data.
* Author: Mohammad Mesbaul Haque
* Github link: https://github.com/mmesba
* Date: 05/03/2022
*/
// Dependencies.
const fs = require('fs');
const path = require('path');
const helpers = require('./helpers');
// App object or Module scaffolding.
const lib = {};
// main functions or objects.
// Base Directory of the data folder
lib.baseDir = path.join(__dirname, '/.data/');
// Write data to file
lib.create = (dir, file, data, callback)=>{
// open file for writing
fs.open(lib.baseDir+dir+'/'+file+'.json', 'wx' , (err1, fileDescriptor)=>{
if (!err1 && fileDescriptor) {
// Convert data to string
const stringData = JSON.stringify(data);
// write data to file and then close it
fs.writeFile(fileDescriptor, stringData, (err2)=>{
if (!err2) {
fs.close(fileDescriptor, (err3)=>{
if (!err3) {
callback(false);
} else {
callback('Error closing the new file !')
}
})
} else {
callback('Error writing to new file')
}
})
} else {
callback('Could not create new file , it may already exist')
}
})
}
// Read data from file
lib.read = (dir, file, callback)=>{
fs.readFile(lib.baseDir+dir+'/'+file+'.json', 'utf-8', (err, data)=>{
if(!err && data){
let parsedData = helpers.parseJsonObject(data);
callback(false, parsedData);
} else{
callback(err ,data);
}
})
}
// Update data
lib.update = (dir, file, data, callback)=>{
// open file for writing
fs.open(lib.baseDir+dir+'/'+file+'.json', 'r+', (err1, fileDescriptor)=>{
if (!err1 && fileDescriptor) {
// Convert the data to string
const stringData = JSON.stringify(data);
// Truncate the file
fs.ftruncate(fileDescriptor, (err2)=>{
if (!err2) {
// Write to the file and close it
fs.writeFile(fileDescriptor, stringData, (err3)=>{
if (!err3) {
// Close the file
fs.close(fileDescriptor, (err4)=>{
if (!err4) {
callback(false);
} else {
callback('Error closing file')
}
})
} else {
callback('Error writing to file')
}
})
} else {
callback('Error truncating file!')
}
})
} else {
callback('Error updating file: may not exist')
}
})
}
// Delete file
lib.delete = (dir, file, callback)=>{
// Unlink file
fs.unlink(lib.baseDir+dir+'/'+file+'.json', (err)=>{
if (!err) {
callback(false);
} else {
callback('Error deleting file')
}
})
}
// export the module.
module.exports = lib;