Building a µservice with Kotlin, Micronaut & GCP
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The document summarizes a presentation about building microservices with Kotlin, Micronaut, and Google Cloud Platform (GCP). The key points are: 1) Micronaut is a new Java framework from 2018 that is designed for building microservices and embraces modern JVM features and memory management. 2) Micronaut provides features like dependency injection, HTTP clients, and filters/interceptors out of the box that help build modern services. 3) The presentation demonstrates building a sample microservice with Micronaut and deploying it to GCP using Docker and Kubernetes. Jib is used to containerize the application.
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Building a µservice with Kotlin, Micronaut & GCP
- 1. Building a µservice with Kotlin, Micronaut & GCP
- 2. Aboutme Robert He/Him Steward of DevConf & Developer User Group Tech Lead at Equal Experts
- 3. DevConf Full day conference Swag, 5 tracks, international speakers You and 800 of your new best friends www.DevConf.co.za
- 4. Agenda Retrospective Lets build a µService together What about that Google secret sauce?
- 5. Wherearewe? Problem: Large retailer who needs to modernize On prem -> Cloud Single system -> microservices Ownership through DevOps and Feature Teams
- 6. Platformteam Builds out common guidance and tooling Alignment is optional but recommended • GCP • K8s & Docker • Base K8s design which includes normalisation • JVM stack
- 7. Ourchoices? Language = Kotlin Framework = Micronaut
- 9. Welcome New… like 2018 new From the fine people who brought you Grails Embrace the world of 2019 • Use modern JVM features & memory management • Build a framework for what we build today • Steal from everyone
- 10. Fastisrelative Fast != Better Better is also relative Fast shouldn’t be your only consideration Fast enough is a good goal to have What are you trading off…
- 11. Coldstart
- 12. Goals
- 13. Reflection API Controller GET /cart Get list of methods Do some loops and lookups … Profit Takes time
- 14. Aheadoftime API Controller GET /cart Get list of methods Do some loops and lookups … Profit Compiler does this now
- 15. Butwhatelse? Amazing Dependency Injection Everything you need to build modern services “in- the-box”, most enabled with a one-line build.gradle change Reasonable initial configs
- 16. Let’s build a µservice
- 17. Go!
- 18. Thedemoisalie I never did mn create-controller in real life We did everything in an interface
- 19. Complaints HTTP Client “magic” Randomness in documentation quality
- 20. Wins Pit of success StackDriver Output Prometheus All the things everyone else has is here Filters & Interceptors The escape hatches are awesome
- 21. Database? DataStore Key/val Want to work with objects – screw these strings Objectify
- 22. Objectify
- 23. Wins/Losses/Lies? Separate project to hide all the logic • Makes micronaut DI annoying Great that I do not need to worry about strings Great that I can choose async or sync
- 24. GettingtoGCP Gateway cart.shop.comproducts.beta.shop .com cart.beta.shop.com pod pod pod pod pod pod pod pod
- 25. Docker,k8s…ohmy
- 26. IwanttoKotlin
- 27. Jib
- 28. Lies? This is a build thing for us (GitLab) Scanning all the items
- 29. Wins? Maven, Gradle & JibCore
- 30. Oddsandends? Testing thoughts • Run all tests all the time • Mock sparingly (Mockk & Wirework) clikt is amazeballs
- 31. Wrapup Micronaut has served us well • Future proof & easy to work with • Do not jump to it, solutions like Micronaut for Spring Thanks to Jib, now you too can be a SRE