My slides from #serverless Conference in New York, May 26th, 2016

1. Serverless Adventures
with AWS Lambda and
Clojure

2. ________ ______
__ ___/______________ ________________ /___________________
_____ _ _ _ ___/_ | / / _ _ ___/_ /_ _ _ ___/_ ___/
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/____/ ___//_/ _____/ ___//_/ /_/ ___//____/ /____/
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┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ │
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│ ___ ____ __ ____ _______. __ ___ .___ ___. .______ _______ ___ │
│ / / / / / | | | / | / | | _ | / │
│ / ^ / / / | (----` | | / ^ | / | | |_) | | .--. | / ^ │
│ / /_ / | | / /_ | |/| | | _ < | | | | / /_ │
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│ /__/ __ &&&&&&&&&&/ |_______/ |_______/__/ __ |__| |__| |______/ |_______/ /__/ __ │
│ &::::::::::& │
│ &::::&&&:::::& ╔════════════════════════════════════════════════════════════════════════════════╗ │
└────────────────&::::&───&::::&────╣ ╠──┘
&::::& &::::& ║ ║
&::::&&&::::& ║ ______ __ ______ __ __ __ .______ _______ ║
&::::::::::& ║ / || | / __ | | | | | | | _ | ____| ║
&:::::::&& ║ | ,----'| | | | | | | | | | | | | |_) | | |__ ║
&::::::::& &&&& ║ | | | | | | | | .--. | | | | | | | / | __| ║
&:::::&&::& &:::& ║ | `----.| `----.| `--' | | `--' | | `--' | | | ----.| |____ ║
&:::::& &::&&:::&& ║ ______||_______| ______/ ______/ ______/ | _| `._____||_______| ║
&:::::& &:::::& ║ ║
&:::::& &::::& ║ ║
&::::::&&&&::::::&& ╚════════════════════════════════════════════════════════════════════════════════╝
&&::::::::&&&::::&
&&&&&&&& &&&&&

3. Lars Trieloff
!❤
! @trieloff
!" @trieloff

4. !"
!"#$%&'

5. !

6. What?

7. Excel + HTTP = Excelsior

8. !"
github.com/trieloff/excelsior

9. !

10. Why?

11. ! Clojure

12. λ !

13. ! 12 ✕
12factor.net

14. ! Swagger
swagger.io

15. !"?

16. AWS Lambda!

17. !" = #

18. !" = #

19. !"

20. AWS λ + Clojure λ = ♥

21. !

22. Sounds good.

23. Sounds too good.

24. Sounds too good to be true.

25. If something sounds too
good to be true, it
probably is.

26. ┌─────────────┐
│ │
│ │
│ Clojure │
│ ┌─────┼───────┐
│ │ ! │ │
└───────┼─────┘ │
│ AWS Lambda │
│ │
│ │
└─────────────┘

27. !

28. How?

29. → ! github.com/metosin/compojure-api
→ " github.com/jpb/ring-aws-lambda-adapter
→ # github.com/mjul/docjure
→ ⭕ circleci.com
→ % github.com/mhjort/lein-clj-lambda

30. ┌────────────────────────┐ ┌────────────────────────┐
│ ┌────────────────────┐ │ │ │
│ │ ┌────────────────┐ │ │ │ │
│ │ │ ┌────────────┐ │ │ │ │ │
│ │ │ │ Docjure !│ │ │ │ │ │
│ │ │ └────────────┘ │ │ │ ┌────────────┐ │ AWS API Gateway │
│ │ │ My code " │ │ │ ┌────────▶│swagger.json│─────Import─────▶│ │
│ │ └────────────────┘ │ │ Export └────────────┘ │ │
│ │ Compojure API # ├─┼─────┘ │ │
│ └────────────────────┘ │ │ │
│ Ring Lambda Adapter $ │ │ │
└────────────────────────┘ └────────────────────────┘
│ │
│ Proxy
│ │
│ ▼
│ ┌────────────────────────┐
│ │ │
│ │ │
│ │ │
│ │ │
│ ┌────────────┐ │ AWS Lambda │
└───────────Build % ─────▶│ server.jar │────Deploy──────▶│ │
└────────────┘ │ │
│ │
│ │
│ │
└────────────────────────┘

31. !

32. Problems?

33. ┌─────────────┐
│ │
│ │
│ Clojure │
│ ┌─────┼───────┐
│ │!"#│ │
└───────┼─────┘ │
│ AWS Lambda │
│ │
│ │
└─────────────┘

34. !"
github.com/trieloff/lein-aws-apigateway

35. !"
AWS API Gateway

36. !"
AWS IAM Permissions

37. Execution failed due to configuration error: Invalid
permissions on Lambda function
aws lambda add-permission
--function-name <name>
--statement-id <someid>
--action "lambda:*"
--principal "apigateway.amazonaws.com"
! docs.aws.amazon.com/cli/latest/reference/
lambda/add-permission.html

38. !

39. Tips?

40. Think small
100 LOC should be
enough for a Lambda
function. !

41. Think
modular
Two tiny functions are
better than one large
function. !

42. !"
github.com/trieloff/salvador

43. Think
Stateless
simplicity, performance,
composablity ☠

44. Be lazy
Sit, don’t stand on the
shoulders of giants. Re-
use, don’t re-invent. ♻

45. ┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐
│ │ │ │ │ │
│ Typeform │───Redirect──▶│ Excelsior │───Redirect──▶│ Salvador │
│ │ │ │ │ │
└──────────────────┘ └──────────────────┘ └──────────────────┘
▲ ▲
│ │
Spreadsheet Template
│ │
│ │
┌──────────────────┐ ┌──────────────────┐
│ │ │ │
│ S3 │ │ S3 │
│ │ │ │
└──────────────────┘ └──────────────────┘

46. Smile & Share
Community eats code for
breakfast. ☕

47. !

48. ⏰

49. AWS λ + Clojure λ = ♥

50. ! Rainbow Parentheses make " #

51. ))))))))))))*