Intro To Serverless ClojureScript
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This document provides an overview of serverless computing and introduces serverless frameworks for ClojureScript including CLJS-Lambda and Serverless-Cljs. It defines serverless as exposing single functions that are run on shared servers and paid for only by execution time. Recommended resources on serverless architectures and the AWS serverless page are provided. The document discusses JVM options for ClojureScript lambdas and introduces lein plugins and templates for building, testing, and deploying serverless ClojureScript functions to AWS Lambda including commands for building, deploying, and invoking functions.
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Intro To Serverless ClojureScript
- 1. Intro To Serverless ClojureScript By Jim Lynch Slides: Bit.Ly/Cljs227
- 2. @CaptainClojure Twitter Bot bit.ly/getJokehttps://twitter.com/CaptainClojure Jim’s Jokes Service
- 3. What Is Serverless? • The ability to expose a single function, run in on a shared server, and pay only for the milliseconds it takes to execute. • A way to host and run your code without having to think about servers. • A command line tool that simplifies building and deploying serverless functions (serverless framework). github.com/serverless/serverless
- 4. A Few Good Resources • Fearless JVM Lambdas. • martinfowler.com Serverless Architectures. https://martinfowler.com/articles/serverless.html • AWS Info page on serverless. https://aws.amazon.com/serverless/ https://www.youtube.com/watch?v=GINI0T8FPD4
- 5. Brief Aside On Serverless JVM Clojure • JVM Lambda starter templates: • lambada • In general nodejs shown to start faster from a “cold start”. • lein-lambda • For heavy processing serverless functions, JVM may execute faster.
- 8. Lein-Cljs-Lambda • A leiningen plugin by nervous.io (moea). • Used in both serverless-cljs and cljs-lambda projects. • Constructs the service’s final build artifacts. https://github.com/nervous-systems/cljs-lambda
- 9. CLJS-Lambda • Library of “ClojureScript utilities for AWS Lambda”. • Dependency of both starter projects. • Exposes macros such as deflambda and defgateway.
- 10. CLJS-Lambda Lein Template • A realistic example of a project that uses lein-cljs-lambda. • Somewhat complex, makes use of core.async, promesa, multimethods, and nodejs “fs”. • Fresh scaffold gives you the “magic word” example. • Comes with doo unit test setup out of the box.
- 11. CLJS-Lambda Commands • Create production build & deploy to AWS: • Invoke function on AWS:
- 12. Serverless-CLJS • Barebones function that echoes the request object. • Comes with a preconfigured serverless.yml file. • Can automate a lot of setup and configuration done in the AWS console. • Great for beginners who just want a “hello world” example.
- 13. Serverless-Cljs Commands • Create production build & deploy to AWS: • Then invoke the deployed function: but with an object more like this:
- 14. Last Month’s AWS Lambda Bill
- 18. Configuring Your AWS Role In Local Command Shell • Need keys to deploy to AWS from command line. • Get “Access Key” and “Secret Access Key in AWS” console: My Security Credentials -> Access Keys • Easiest way to configure user is with aws cli. • Cljs-lambda starter also comes with helper command:
- 19. Calling Functions Locally • Start lumo with lein dependencies. • Load file into the REPL. • Load the file’s namespace into the REPL.
- 20. Automated Testing • Cljs-lambda comes with doo unit testing setup (not difficult to add to serverless-cljs scaffold either). • Easiest way to e2e test: deploy the function and call it from command line, postman, AWS console, etc. • Write a script (in any language that supports REST calls) that calls the live function with various inputs, expecting desired outputs.