Elixir Findings

Philipp is going to talk about his findings and lessons learned since the last Elixir meetup in December.

He improved his CI/CD pipeline with Distillery, implemented efficient background jobs with BEAM utilities and had a look on the BEAM features (D)ETS and Mnesia. Furthermore, he will shortly introduce Sobelow and indicates easy web performance improvements. Lastly, he presents how you can customize the generator templates of Phoenix and concludes the talk with the generic creation of Phoenix.HTML.form functions.

Transcript

1. ELIXIR FINDINGS 28.03.2018 Philipp Neugebauer @ppneugebauer ELIXIR MEETUP MÜNCHEN
2. Keep it simple! Philipp Neugebauer
 IT Consultant at INNOQ • Rails/Phoenix • Simple CI/CD • Docker/AWS/DO
3. COMPILE CACHE RESTORE DISTILLERY with CIRCLECI DOCKER IMAGE CACHE SAVE DEPLOY
4. DISTILLERY with CIRCLECI Docker Layer Cache CI Cache + Docker CI Cache + Distillery Build Context Size 1 MB 248 MB 35 MB Cache Size 662 MB 638 MB 221 MB Deployment Time ~6:20min ~8:10min ~2:30min Image Size 1.08 GB 1.53 GB 0.53 GB
5. CONCLUSIONS • Compiled code is different • Not that simple • Still worth the benefits
6. BACKGROUND JOBS W W W W S S Task Worker spawns
7. BACKGROUND JOBS W W W W S Task Worker spawns Results Tasks :one_for_one
8. (D)ETS • Disk vs Memory • Key Value Store • Process owned • Race Conditions ★ Fast Cache
9. (D)ETS
10. MNESIA • DETS’ persistence • ETS’ performance • Transactions + indexes
12. CODE ANALYSIS • Sobelow • Security-focused • Only indicator https://github.com/nccgroup/sobelow
13. WEB PERFORMANCE • gzip • Webpack: purgeCSS • Check: Lighthouse in Chrome
14. PHOENIX TEMPLATES • Mix tasks in lib/mix/tasks • View templates in priv/templates • Customizable
15. PHOENIX HTML FORMS [:text_input] |> Enum.each(fn method -> def unquote(method)(form, field, opts \\ []) when is_atom(field) do opts = do_something(form, field, opts) elem(Code.eval_string( “Phoenix.HTML.Form.#{Atom.to_string( elem(__ENV__.function, 0))}(form, field, opts)”, [form: form, field: field, opts: opts]), 0) end end) https://elixirforum.com/t/correct-display-of-errors-in-phoenix-html-with-bootstrap/20076/3?u=flp
16. ELIXIR FINDINGS 28.03.2018 Philipp Neugebauer @ppneugebauer ELIXIR MEETUP MÜNCHEN