61 lines
1.8 KiB
JavaScript
61 lines
1.8 KiB
JavaScript
import express from 'express'
|
|
import puppeteer from 'puppeteer'
|
|
|
|
const captureUrl = process.env.CAPTURE_URL || 'http://host.docker.internal:3000/'
|
|
const port = process.env.PORT || 5678
|
|
const maxPages = process.env.MAX_PAGES || 5
|
|
const timeout = process.env.TIMEOUT || 10000
|
|
const cache = process.env.CACHE || 60000
|
|
const width = process.env.WIDTH || 600
|
|
const height = process.env.HEIGHT || 315
|
|
const deviceScaleFactor = process.env.SCALE_FACTOR || 2
|
|
|
|
let browser
|
|
const app = express()
|
|
|
|
app.get('/health', (req, res) => {
|
|
res.status(200).end()
|
|
})
|
|
|
|
app.get('/*', async (req, res) => {
|
|
browser ||= await puppeteer.launch({
|
|
headless: 'new',
|
|
executablePath: 'google-chrome-stable',
|
|
args: ['--no-sandbox', '--disable-setuid-sandbox']
|
|
})
|
|
const url = new URL(req.originalUrl, captureUrl)
|
|
console.time(url.href)
|
|
console.timeLog(url.href, 'capturing', 'current pages', (await browser.pages()).length)
|
|
|
|
// limit number of active pages
|
|
if ((await browser.pages()).length > maxPages + 1) {
|
|
console.timeLog(url.href, 'too many pages')
|
|
console.timeEnd(url.href)
|
|
return res.writeHead(503, {
|
|
'Retry-After': 1
|
|
}).end()
|
|
}
|
|
|
|
let page
|
|
try {
|
|
page = await browser.newPage()
|
|
await page.setViewport({ width, height, deviceScaleFactor })
|
|
await page.emulateMediaFeatures([{ name: 'prefers-color-scheme', value: 'dark' }])
|
|
await page.goto(url.href, { waitUntil: 'load', timeout })
|
|
const file = await page.screenshot({ type: 'png', captureBeyondViewport: false })
|
|
res.setHeader('Content-Type', 'image/png')
|
|
res.setHeader('Cache-Control', `public, max-age=${cache}, immutable`)
|
|
res.status(200).end(file)
|
|
} catch (err) {
|
|
console.log(err)
|
|
return res.status(500).end()
|
|
} finally {
|
|
console.timeEnd(url.href)
|
|
page?.close()
|
|
}
|
|
})
|
|
|
|
app.listen(port, () =>
|
|
console.log(`Screenshot listen on http://:${port}`)
|
|
)
|