ab26e9881f
Added following logic: 1. New clients receive 15 entry history from history file 2. After that, every 10 seconds when new entry is generated it is sent out to all connected clients
83 lines
1.9 KiB
JavaScript
83 lines
1.9 KiB
JavaScript
import path from 'path';
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import fs from 'fs';
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export default class HistoryFile {
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constructor(fileName) {
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this.path = path.join(process.cwd(), fileName);
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this.history = [];
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this.load();
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}
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/**
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* Writes history to file
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* @returns {boolean} true if successful, false otherwise
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*/
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writeToFile() {
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try {
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fs.writeFileSync(this.path, JSON.stringify(this.history, null, 2));
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return true;
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} catch (err) {
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console.error(`Failed to write data to history file: ${err.message}`);
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return false;
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}
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}
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/**
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* Reads history file, and returns it as JSON
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* @returns {array}
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*/
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readFromFile() {
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try {
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const raw = fs.readFileSync(this.path, 'utf-8');
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return JSON.parse(raw);
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} catch (err) {
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console.warn(`Failed at reading history, using empty history: ${err.message}`);
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return [];
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}
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}
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/**
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* Loads history file, if it exists
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* If not, creates empty file
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*/
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load() {
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if (fs.existsSync(this.path)) {
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// Read file, and update this.history
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const data = this.readFromFile();
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this.history = data;
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} else {
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// Create empty history file, if doesn't exist
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this.writeToFile();
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}
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}
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/**
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* Saves most recent 15 entries to history file
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*/
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save() {
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// If there's more than 15 entries, we need to save only most recent 15 ones
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if (this.history.length > 15) {
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this.history = this.history.slice(this.history.length - 15);
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}
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// Write to history file
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this.writeToFile();
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}
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/**
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* Appends new entry to history file
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* Returns most recent entry
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* @param {number} number
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* @returns {object}
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*/
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append(number) {
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const data = { number, timestamp: Date.now() };
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// Push new entry to history
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this.history.push(data);
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// Save history file, and keep only 15 entries
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this.save();
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// Return most recent entry
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return data;
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}
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}
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