Simplifying systems with Elixir - Belgrade

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