Simplifying systems with Elixir - Belgrade

Transcript

1. Simplifying systems with Elixir @sasajuric aircloak.com

2. Elixir functional concurrent

3. process ... foo(...) bar(...) ...

4. functional Elixir modules and functions immutable data first-class functions

5. ... spawn(fn -> ... end) ...

6. process A ... foo(...) bar(...) ... process B ... baz(...)

   qux(...) ...

7. send( process_b, some_message ) receive do message -> handle(message) end

   process a process b

8. BEAM (Erlang VM)

9. BEAM (Erlang VM)

10. scheduler scheduler scheduler scheduler BEAM (Erlang VM) CPU CPU CPU

    CPU

11. concurrent functional

12. activities incoming requests background jobs in-memory state load control …

13. managing activities multiple OS processes 3rd party products service managers

14. None
15. None

16. uniformity simpler development simpler testing simpler deployment simpler maintenance improved

    collaboration
17. None

18. theerlangelist.com

19. git clone https://github.com/sasa1977/erlangelist.git mix deps.get && pushd assets && npm

    install && popd iex -S mix phx.server
20. None

21. serving requests

22. http listener https listener

23. http listener https listener handler 1 handler 2 handler n

    …

24. usage stats

25. stats collector handler handler handler

26. stats collector disk writer

27. def store(path, data) do File.write!( path, :erlang.term_to_binary(data) ) end

28. def read(path, default) do path |> File.read!() |> :erlang.binary_to_term() rescue

    ArgumentError -> default end

29. cleanup

30. scheduler cleanup job periodically starts

31. HTTPS

32. our system CA server certificate request challenge info challenge

33. certifier http server usage stats

34. dev CA server

35. service management

36. defmodule StatsCollector do def start_link() do # ... end #

    ... end

37. Supervisor.start_link( [ StatsCollector, Cleanup ], # .. )

38. supervisor stats collector cleanup

39. supervisor worker

40. 1

41. 1 2

42. 1 2 3 4 5

43. 1 2 6 9 7 8 3 4 5

44. erlangelist usage stats web

45. usage stats stats collector cleanup

46. web ACME server main site certifier

47. None

48. technical feature built-in options services GenServer, Task service manager Supervisor

    service registry Registry k-v ets, mnesia web server phoenix, plug, cowboy periodical jobs :timer, quantum, periodic load regulation jobs, safetyvalve, sbroker concurrent flows Flow, GenStage

49. Elixir in a nutshell start simple go far

50. Elixir guides Phoenix guides Learning resources Elixir forum

51. 40% off using code ctwelixirbg18 at manning.com slides available at

    bit.ly/elixirbg102018