import puppeteer, { Browser, Page } from 'puppeteer';
import { debug } from './utils/config.js';
/**
* Singleton browser manager to handle Puppeteer instances
*/
class BrowserManager {
private static instance: BrowserManager;
private browser: Browser | null = null;
private isInitializing = false;
private initPromise: Promise<Browser> | null = null;
private constructor() {}
/**
* Get the singleton instance of BrowserManager
*/
public static getInstance(): BrowserManager {
if (!BrowserManager.instance) {
BrowserManager.instance = new BrowserManager();
}
return BrowserManager.instance;
}
/**
* Initialize the browser if not already initialized
*/
public async getBrowser(): Promise<Browser> {
if (this.browser) {
return this.browser;
}
if (this.isInitializing) {
// If initialization is in progress, return the promise
return this.initPromise!;
}
this.isInitializing = true;
this.initPromise = this.initBrowser();
try {
this.browser = await this.initPromise;
return this.browser;
} finally {
this.isInitializing = false;
this.initPromise = null;
}
}
/**
* Initialize a new browser instance
*/
private async initBrowser(): Promise<Browser> {
const headless = process.env.PUPPETEER_HEADLESS !== 'false';
debug(`Launching Puppeteer browser (headless: ${headless})`);
try {
const browser = await puppeteer.launch({
headless,
args: ['--no-sandbox', '--disable-setuid-sandbox', '--disable-dev-shm-usage'],
});
// Handle browser disconnection
browser.on('disconnected', () => {
debug('Browser disconnected');
this.browser = null;
});
return browser;
} catch (error) {
console.error('Failed to launch browser:', error);
throw error;
}
}
/**
* Create a new page with default settings
*/
public async newPage(): Promise<Page> {
const browser = await this.getBrowser();
const page = await browser.newPage();
// Set default timeout
const timeout = parseInt(process.env.PAGE_TIMEOUT || '30000', 10);
page.setDefaultTimeout(timeout);
page.setDefaultNavigationTimeout(timeout);
// Set a realistic user agent
await page.setUserAgent(
'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36'
);
return page;
}
/**
* Close the browser instance
*/
public async closeBrowser(): Promise<void> {
if (this.browser) {
try {
await this.browser.close();
this.browser = null;
debug('Browser closed successfully');
} catch (error) {
console.error('Error closing browser:', error);
}
}
}
}
export const browserManager = BrowserManager.getInstance();
