![]() This process will take up to a few milliseconds up to a few seconds and All of these introduce latency and impact the performance of your PDF generation. However, one of the shortcomings of Serverless is cold starts.Īccording to AWS, the invocation of AWS Lambda goes thru a few stages: it includes downloading the code from AWS S3 and creating an environment with the right memory, CPU, and runtime for the code, and finally initialization of the code. If you are looking for a cost-effectively way to generate PDFs, serverless is the way to go. Puppeteer will then create a new directory called tmp in the current working directory and use it as the user data directory. To set the userDataDir setting, simply pass in the path to the desired directory when launching Puppeteer: const puppeteer = require('puppeteer') Setting the userDataDir allows all the downloaded assets to be stored in a fixed directory, and reusable resources such as HTML, CSS, and images will be reused for the next Puppetter instances. If you’re going to generate a lot of PDFs with Puppeteer and it requires the download of external resources, it’s best to use the userDataDir setting. This will prevent the PDF generation process from becoming slow over time. The default setting will launch a new instance of Chrome or Chromium with a fresh user data directory. This directory is used to store data such as your browsing history, bookmarks, downloaded assets and so on. When you launch Chrome or Chromium, it will create a user data directory. '-disable-offer-store-unmasked-wallet-cards', '-disable-features=AudioServiceOutOfProcess', '-disable-client-side-phishing-detection', '-disable-backgrounding-occluded-windows', '-autoplay-policy=user-gesture-required', So, it’s best to use only the necessary features and disable those unused features.įor example, the following Puppeteer options are to disable some of the unused features such as speech-api or mute-audio when generating a PDF: const puppeteer = require('puppeteer') Īrgs: [ '-disable-features=IsolateOrigins', However, using the default settings can actually slow down the PDF generation process, because even if they are not using some of the features, the browser process will still load them into memory. When you generate a PDF with Puppeteer, you can use the default parameters and settings. In this article, we also show you a few tips on how to improve the performance of your AWS Lambda functions. This is because Puppeteer is headless, which means that it does not need a graphical user interface (GUI) to run. ![]() Puppeteer can also be used in serverless environments such as AWS Lambda or Google Cloud Function. For example, you can use it to crawl a product catalog and extract the prices and product descriptions. Crawling websites and extracting data: You can use Puppeteer to crawl websites and extract data from them.For example, you can use it to check if a button on a web page works as expected. Testing web pages: You can use Puppeteer to test web pages for functionality and correctness.For example, you can use it to sign up for a newsletter or register for an event on a website. Automating form submission: You can use Puppeteer to automatically fill and submit forms on web pages.Puppeteer is also used for converting HTML to PDF. For example, you can use it to take a screenshot of a landing page and generate a PDF of the same. Generating screenshots and PDFs of web pages: You can use Puppeteer to programmatically take screenshots and generate PDFs of web pages.Puppeteer can be used for various purposes, such as: ![]() Puppeteer runs on Windows, macOS, and Linux. log( "CHILD: url received from parent process", url) Ĭonst browser = await puppeteer.It can also be configured to use full (non-headless) Chrome or Chromium. The code snippet below is a simple example of running parallel downloads with Puppeteer.Ĭonst downloadPath = path. □ If you are not familiar with how child process work in Node I highly encourage you to give this article a read. We can combine the child process module with our Puppeteer script and download files in parallel. Child process is how Node.js handles parallel programming. We can fork multiple child_proces in Node. Our CPU cores can run multiple processes at the same time. □ Learn more about the single threaded architecture of node here Therefore if we have to download 10 files each 1 gigabyte in size and each requiring about 3 mins to download then with a single process we will have to wait for 10 x 3 = 30 minutes for the task to finish. It can only execute one process at a time. You see Node.js in its core is a single-threaded system. However, if you have to download multiple large files things start to get complicated. In this next part, we will dive deep into some of the advanced concepts.
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