Ktor-MongoDB-Altas-KotlinMeetup-PDF.pdf

Transcript

1. Ian Arbuckle - Android Developer @ CarTrawler Ktor & MongoDB Altas Building RESTful APIs with Ktor & MongoDB Altas
2. What is Ktor?
3. It is a lightweight framework to write server side applications purely in Kotlin!
4. What’s special about Ktor? • You can write small microservices with less boilerplate • It’s asynchronous and uses DSL • Open source and completely free! • And oh.. should I say fun?
5. val Setup = PipelinePhase("Setup") // Phase for preparing the call, and processing attributes val Monitoring = PipelinePhase("Monitoring") // Phase for tracing calls: logging, metrics, error handling etc. val Features = PipelinePhase("Features") // Phase for infrastructure features, most intercept at this phase val Call = PipelinePhase("Call") // Phase for processing a call and sending a response val Fallback = PipelinePhase("Fallback") // Phase for handling unprocessed calls Source: https://ktor.io/docs/lifecycle.html#features
6. val Setup = PipelinePhase("Setup") // Phase for preparing the call, and processing attributes val Monitoring = PipelinePhase("Monitoring") // Phase for tracing calls: logging, metrics, error handling etc. val Features = PipelinePhase("Features") // Phase for infrastructure features, most intercept at this phase val Call = PipelinePhase("Call") // Phase for processing a call and sending a response val Fallback = PipelinePhase("Fallback") // Phase for handling unprocessed calls Source: https://ktor.io/docs/lifecycle.html#features
7. val Setup = PipelinePhase("Setup") // Phase for preparing the call, and processing attributes val Monitoring = PipelinePhase("Monitoring") // Phase for tracing calls: logging, metrics, error handling etc. val Features = PipelinePhase("Features") // Phase for infrastructure features, most intercept at this phase val Call = PipelinePhase("Call") // Phase for processing a call and sending a response val Fallback = PipelinePhase("Fallback") // Phase for handling unprocessed calls Source: https://ktor.io/docs/lifecycle.html#features
8. val Setup = PipelinePhase("Setup") // Phase for preparing the call, and processing attributes val Monitoring = PipelinePhase("Monitoring") // Phase for tracing calls: logging, metrics, error handling etc. val Features = PipelinePhase("Features") // Phase for infrastructure features, most intercept at this phase val Call = PipelinePhase("Call") // Phase for processing a call and sending a response val Fallback = PipelinePhase("Fallback") // Phase for handling unprocessed calls Source: https://ktor.io/docs/lifecycle.html#features
9. val Setup = PipelinePhase("Setup") // Phase for preparing the call, and processing attributes val Monitoring = PipelinePhase("Monitoring") // Phase for tracing calls: logging, metrics, error handling etc. val Features = PipelinePhase("Features") // Phase for infrastructure features, most intercept at this phase val Call = PipelinePhase("Call") // Phase for processing a call and sending a response val Fallback = PipelinePhase("Fallback") // Phase for handling unprocessed calls Source: https://ktor.io/docs/lifecycle.html#features
10. val Setup = PipelinePhase("Setup") // Phase for preparing the call, and processing attributes val Monitoring = PipelinePhase("Monitoring") // Phase for tracing calls: logging, metrics, error handling etc. val Features = PipelinePhase("Features") // Phase for infrastructure features, most intercept at this phase val Call = PipelinePhase("Call") // Phase for processing a call and sending a response val Fallback = PipelinePhase("Fallback") // Phase for handling unprocessed calls Source: https://ktor.io/docs/lifecycle.html#features
11. Setup Monitoring Features Call Fallback Pipeline Source: https://www.ximedes.com/2020-09-17/role-based-authorization-in-ktor/
12. Setup Monitoring Features Call Fallback Request Response Pipeline Phases Source: https://www.ximedes.com/2020-09-17/role-based-authorization-in-ktor/
13. Setup Monitoring Features Call Fallback Request Response Interceptor Interceptor Interceptor Interceptor Interceptor Phases Source: https://www.ximedes.com/2020-09-17/role-based-authorization-in-ktor/ Pipeline
14. routing { get() { /* show homepage */ } get("/conferences") { /* show conferences */ } post("/conferences") { /* create a conference */ } }
15. routing { get() { /* show homepage */ } get("/conferences") { /* show conferences */ } post("/conferences") { /* create a conference */ } }
16. routing { get() { /* show homepage */ } get("/conferences") { /* show conferences */ } post("/conferences") { /* create a conference */ } }
17. routing { get() { /* show homepage */ } get("/conferences") { /* show conferences */ } post("/conferences") { /* create a conference */ } }
18. routing { get() { /* show homepage */ } get("/conferences") { /* show conferences */ } post("/conferences") { /* create a conference */ } }
19. / /METHOD :GET /conferences (METHOD :GET) /conferences (METHOD :POST) routing { get() { /* show homepage */ } get("/conferences") { /* show conferences */ } post("/conferences") { /* create a conference */ } } Source: https://www.ximedes.com/2020-09-17/role-based-authorization-in-ktor/
20. Sounds cool.. but Ktor docs has support for postgreSQL and I don’t like SQL!
21. Enter MongoDB!
22. “MongoDB is a general purpose, document-based, distributed database built for modern developers and for the cloud era.” - Wikipedia
23. “MongoDB is a general purpose, document-based, distributed database built for modern developers and for the cloud era.” - Wikipedia
24. “MongoDB is a general purpose, document-based, distributed database built for modern developers and for the cloud era.” - Wikipedia
25. MongoDB Atlas • Formerly known as mLab • Allows you to host a database on somebody else’s computer! • Perfect for agile teams who’d rather spend time building apps • Allows you to pick your cloud provider!
26. What we’re going to build..
27. • Conference management dashboard • We’re going to create a RESTful CRUD app • MongoDB Atlas will be used as the NoSQL cloud database What we’re going to build..
28. What we won’t be covering..
29. What we won’t be covering.. • Authentication • Session management • Testing
30. Live showcase time!
31. Demo Source Code https://github.com/IanArb/conferencesKtor Client side example https://github.com/IanArb/ConferenceFinder
32. Resources • Official documentation https://ktor.io • Ktor roadmap https://blog.jetbrains.com/ktor/2020/08/10/ktor-roadmap- for-2020-2021/ • MongoDB Atlas https://www.mongodb.com/cloud/atlas • KMongo a wrapper library for MongoDB https://github.com/Litote/kmongo • Good article on building role based authentication https://ktor.io/docs/ lifecycle.html#features
33. Questions?