![]() These steps could be as simple as checking that all UI elements are where they should be or as complex as simulating an entire checkout flow.Į is a very simple website so we’ll just add a couple of steps here: one to check the website’s heading and another to click the “more info” link and check that it works as expected: Next, you add the steps you wish to perform on the website once it’s loaded in the headless Chromium. Provide a name to the canary and provide the URL of the website to visit: ![]() Canary for Website UIįor this canary, select the “GUI workflow builder” blueprint: Both can be built starting from a blueprint so we’ll start there. In this article, we will be creating two canaries: one to test our website’s UI and another to test our backend APIs. You can either start with a blueprint (like Lambda functions) and modify it to suit your needs or write the Node.js or Python code from scratch either in the console’s inline editor or upload the same to S3 and use it from there. The first thing you’re asked is “how would you like to create your canary?” Start by visiting /cloudwatch/home#synthetics:canary/create. Let us now look at how to create a canary test for a website/API. ![]() They monitor your REST APIs, URLs, and website content, and they can check for unauthorized changes from phishing, code injection and cross-site scripting. It can also be configured to use full (non-headless) Chrome or Chromium.Ĭanaries check the availability and latency of your endpoints and can store load time data and screenshots of the UI. Puppeteer is a Node library that provides a high-level API to control headless Chrome or Chromium over the DevTools Protocol. When using Node.js, canaries use Google’s Puppeteer library to perform the tests, and when using Python, the hugely popular Selenium framework is used. Think of canaries like Lambda functions that run on a schedule, visit your website, hit your APIs, etc, collect metrics about everything they did, and go back to sleep again.Ĭanaries use a headless Chromium browser to perform tasks like opening web pages and taking screenshots. Canaries can be written in Node.js 12 or Python 3.8. Canary tests or “canaries” are small, modular, lightweight pieces of code that simulate user interaction with your application. CloudWatch SyntheticsĪs of now, CloudWatch Synthetics has a single purpose: to let you write canary tests. We’ll look at how to build canary tests in Synthetics to monitor both a production website and also its backend APIs on a regular cadence. The focus of this article is CloudWatch Synthetics.
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