Created
February 1, 2020 06:21
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A sketch of a lambda to take a screenshot and save it to S3
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| // NB: I'd normally deploy this using CloudFormation | |
| /* | |
| The lambda needs the following configuration: | |
| - A bunch of memory probably 2GB | |
| - Better to have a long timeout just in case | |
| - Must include the following later: | |
| - nodejs10.x (or a newer layer - but haven't tested) | |
| - BUCKET_NAME environment variable | |
| - Permissions to access BUCKET_NAME | |
| */ | |
| const chromium = require('chrome-aws-lambda'); | |
| const { Browser } = require ('puppeteer-core'); | |
| const puppeteer = chromium.puppeteer; | |
| const {S3} = require('aws-sdk'); | |
| const s3 = new S3(); | |
| exports.handler = async (event) => { | |
| console.log(event.url); | |
| const buffer = await screenshot(event.url); | |
| console.log('got buffer'); | |
| await s3 | |
| .putObject({ | |
| Bucket: process.env.BUCKET_NAME, | |
| Key: 'image.png', // todo: determine the key dynamically, based on the provided URL | |
| Body: buffer | |
| }) | |
| .promise(); | |
| console.log('wrote to s3'); | |
| // TODO implement | |
| const response = { | |
| statusCode: 200, | |
| body: JSON.stringify('Hello from Lambda!'), | |
| }; | |
| return response; | |
| }; | |
| "use strict"; | |
| async function screenshot(url) { | |
| let browser; | |
| let buffer; | |
| let error; | |
| try { | |
| browser = await puppeteer.launch({ | |
| args: chromium.args, | |
| defaultViewport: chromium.defaultViewport, | |
| executablePath: await chromium.executablePath, | |
| headless: true | |
| }); | |
| const page = await browser.newPage(); | |
| await page.goto(url, { waitUntil: 'networkidle0' }); | |
| // await page.waitForSelector('img'); // todo: might want to re-enable this | |
| buffer = await page.screenshot({ type: 'png' }); | |
| } | |
| catch (err) { | |
| error = err; | |
| } | |
| finally { | |
| if (browser) { | |
| await browser.close(); | |
| } | |
| } | |
| if (error) { | |
| throw error; | |
| } | |
| if (!buffer) { | |
| throw new Error('Oh no! Did not get the pdf!'); | |
| } | |
| return buffer; | |
| } |
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