Customizing Loopback - Integrating More Modules

Loopback is a great tool that allows you to generate an Express.js API from the command line. In this talk, I show you how you can take advantage of the Node.js ecosystem and integrate other modules into a Loopback API as business logic.

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1. Customizing Loopback – Integrating More Modules David Okun, Developer Evangelist, Strongloop & Swift@IBM @dokun24 February 21, 2017
2. What is a Loopback? • THE easiest & fastest way to set up a RESTful web API. • Uses Express, Node, and Yeoman. • Get an API up with writing zero code.
3. Extending Your API – The Scenario • We have two immutable microservices. • We want to combine their output and cache it locally.
4. Aren’t Microservices Adorable?
5. Today’s Modules • request • https://npmjs.com/package/request
6. Today’s Modules • request-promise & bluebird • https://npmjs.com/package/request- promise • https://npmjs.com/package/bluebird
7. Setup • Node.js & npm (I’m running 7.4.0 and 4.0.5) • npm install –g loopback • npm install –g strongloop
8. Our Microservices
9. Today’s Demo • The finished product can be found at: • https://github.com/dokun1/LoopbackModulesDemo
10. Our Microservices – Up And Running
11. Loopback!
12. In-Memory Datasource
13. Setting up our Animal object
14. Model…
15. Model…
16. Model…
17. Model…
18. Sanity Check
19. Sanity Check
20. Remote Methods • A remote method is a method of a model. • Can be made with lb remote-method.
21. Animal.js
22. Remote Hooks • A remote hook is a function that can be executed before or after a remote method is called. • beforeRemote(), afterRemote(), afterRemoteError().
23. Animal.js
24. Operation Hooks • An operation hook is a function triggered on a higher-order function of a PersistedModel object.
25. Operation Hooks (cont.)
26. Animal.js
27. Animal.js
28. Animal.js
29. And we’re clear!!
30. But actually… • We aren’t validating the entries we get, so we always get duplicates.
31. Animal.js
32. Animal.js
33. Animal.js
34. Animal.js
35. And we’re clear!!
36. Bonus Points: Validators • Model objects can use a set of common validators for convenience. • Only supported with in-memory, Oracle, and MongoDB.
37. Animal.js
38. Wrapping up • Loopback isn’t just for POCs – rather than limiting you to generated code, it supports what you want to build. • It gets out of the way when you need it to.
39. Resources • https://loopback.io • Adding logic: https://loopback.io/doc/en/lb3/Adding-application-logic.html • Demo Repo: https://github.com/dokun1/LoopbackModulesDemo • Stack Overflow: http://stackoverflow.com/questions/tagged/loopback • Me on Twitter: @dokun24
40. Thank You!!!