107 lines
3.3 KiB
JavaScript
107 lines
3.3 KiB
JavaScript
import express from 'express'
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import puppeteer from 'puppeteer'
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const captureUrl = process.env.CAPTURE_URL || 'http://host.docker.internal:3000/'
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const port = process.env.PORT || 5678
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const maxPages = Number(process.env.MAX_PAGES) || 5
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const timeout = Number(process.env.TIMEOUT) || 10000
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const cache = process.env.CACHE || 60000
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const width = process.env.WIDTH || 600
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const height = process.env.HEIGHT || 315
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const deviceScaleFactor = process.env.SCALE_FACTOR || 2
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// from https://www.bannerbear.com/blog/ways-to-speed-up-puppeteer-screenshots/
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const args = [
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'--autoplay-policy=user-gesture-required',
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'--disable-background-networking',
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'--disable-background-timer-throttling',
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'--disable-backgrounding-occluded-windows',
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'--disable-breakpad',
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'--disable-client-side-phishing-detection',
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'--disable-component-update',
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'--disable-default-apps',
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'--disable-dev-shm-usage',
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'--disable-domain-reliability',
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'--disable-extensions',
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'--disable-features=AudioServiceOutOfProcess',
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'--disable-hang-monitor',
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'--disable-ipc-flooding-protection',
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'--disable-notifications',
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'--disable-offer-store-unmasked-wallet-cards',
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'--disable-popup-blocking',
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'--disable-print-preview',
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'--disable-prompt-on-repost',
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'--disable-renderer-backgrounding',
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'--disable-setuid-sandbox',
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'--disable-speech-api',
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'--disable-sync',
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'--hide-scrollbars',
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'--ignore-gpu-blacklist',
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'--metrics-recording-only',
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'--mute-audio',
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'--no-default-browser-check',
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'--no-first-run',
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'--no-pings',
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'--no-sandbox',
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'--no-zygote',
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'--password-store=basic',
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'--use-gl=swiftshader',
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'--use-mock-keychain'
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]
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let browser
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const app = express()
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app.get('/health', (req, res) => {
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res.status(200).end()
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})
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app.get('/*', async (req, res) => {
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const url = new URL(req.originalUrl, captureUrl)
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const timeLabel = `${Date.now()}-${url.href}`
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let page, pages
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try {
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console.time(timeLabel)
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browser ||= await puppeteer.launch({
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headless: 'new',
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useDataDir: './data',
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executablePath: 'google-chrome-stable',
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args,
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protocolTimeout: timeout,
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defaultViewport: { width, height, deviceScaleFactor }
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})
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pages = (await browser.pages()).length
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console.timeLog(timeLabel, 'capturing', 'current pages', pages)
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// limit number of active pages
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if (pages > maxPages + 1) {
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console.timeLog(timeLabel, 'too many pages')
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return res.writeHead(503, {
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'Retry-After': 1
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}).end()
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}
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page = await browser.newPage()
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await page.emulateMediaFeatures([{ name: 'prefers-color-scheme', value: 'dark' }])
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await page.goto(url.href, { waitUntil: 'load', timeout })
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console.timeLog(timeLabel, 'page loaded')
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const file = await page.screenshot({ type: 'png', captureBeyondViewport: false })
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console.timeLog(timeLabel, 'screenshot complete')
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res.setHeader('Content-Type', 'image/png')
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res.setHeader('Cache-Control', `public, max-age=${cache}, immutable, stale-while-revalidate=${cache * 24}, stale-if-error=${cache * 24}`)
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return res.status(200).end(file)
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} catch (err) {
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console.timeLog(timeLabel, 'error', err)
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return res.status(500).end()
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} finally {
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console.timeEnd(timeLabel, 'pages at start', pages)
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page?.close().catch(console.error)
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}
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})
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app.listen(port, () =>
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console.log(`Screenshot listen on http://:${port}`)
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)
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