temp cache db

db.js

const steno = require('steno')
const fs = require('graceful-fs')

let temp = {}

function write(key, value) {
	temp[key] = value;
	fs.readFile('test.json', 'utf-8', (err, data) => {
		console.log(data)
		if (!data) data = '{}';
		const o = Object.assign(JSON.parse(data), temp);
		steno.writeFile('test.json', JSON.stringify(o), (err) => {
			delete temp[key];
		});
	});
}

function read(key) {
	if (temp[key]) {
		return new Promise((res, rej) => {
			res(temp[key])
		})
	} else {
		return new Promise((res, rej) => {
			fs.readFile('test.json', 'utf-8', (err, data) => {
				if (!data) data = '{}';
				const o = JSON.parse(data);
				res(o[key])
			});
		})
	}
}

write('mackzsad', 1123)
read('hoes').then(s => console.log(1, s))
read('mackzsad').then(s => console.log(2, s))
read('kalsjd').then(s => console.log(3, s))
write('alksjd', 1123)