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Let's create stateful systems, by Elixir
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さっちゃん
August 24, 2019
Programming
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Let's create stateful systems, by Elixir
さっちゃん
August 24, 2019
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Transcript
Let's create stateful systems, by Elixir
. 。oO( さっちゃんですよヾ( 〃l _ l) ノ゙☆)
I'll show you a number.
2
Two
Ⅱ
⼆
2 is a number of collison & collaboration.
I & you hot & ice stand up & lie
down inside & outside
stateless & stateful
Function is stateless. f : x -> y e.g. Web
server
Dialogue is stateful. Alice : X. Bob : Y. Alice
: X. Bob : Z. Most of the system is stateful.
Elixir
Elixir is a functional programming language. Functional programming is stateless.
All data of Elixir is immutable. [x, 3, x] = Enum.map([1,2,1], &(&1 + 1)) assert 2 == x // Many lines that don't reassign to `x`. assert 2 == x
Elixir has processes. 29 = Task.async(fn -> 29 end) |>
Task.await
Process has state. agent = Agent.start_link(fn -> 29 end) 29
= Agent.get(agent, &(&1)) Agent.update(agent, &(&1 + 13)) 42 = Agent.get(agent, &(&1))
State should be updated in a transaction. State shold interact
& isolate each other. Accessing to state should be scaled in-out. Server with state should be updated gracefully. Elixir has all of these!
State should be updated in a transaction. (No shared state)
State shold interact & isolate each other. (Application, Supervisor) Accessing to state should be scaled in-out. (GenStage, Task, Register, Erlang cluster) Server with state should be updated gracefully. (Hot code swap)
We can create stateful system easy, by constructing stateless parts.
How we can start Elixir? Let's create some applications. *
Web application with Phoenix. * Slack bot.
Phoenix is a Web application framework that familiar with WebSocket.
https://hexdocs.pm/phoenix/overview.html
React is available (✿ >ヮ ╹ )-♡ Let's create a
realtime interaction ∩ (> ◡ <*)∩ ♡ https://speakerdeck.com/ne_sachirou/phoenix-livereact
Create a Slack bot. https://github.com/BlakeWilliams/Elixir-Slack (Easy, so no topic.)
Installing Elixir. asdf https://asdf-vm.com/ asdf plugin-add erlang asdf install erlang
22.0.7 asdf plugin-add elixir asdf install elixir 1.9.1
Text editor? VSCode with mjmcloug.vscode-elixir works.
Format & lint. InnerCotton https://github.com/ne-sachirou/inner_cotton is a set of standard
development tools. mix cotton.init mix cotton.lint --fix
Docker image (You need Docker :-) Fix major ver.s both
Erlang & Elixir. docker run -it --rm nesachirou/elixir:1.9_erl22
Textbook & document. Official guide : https://elixir-lang.org/ Official document :
https://hexdocs.pm/elixir/Kernel.html Online textbook : https://elixirschool.com/ja/ Textbook : https://tatsu-zine.com/books/programming-elixir-ja
https://speakerdeck.com/ne_sachirou/elixirwan-quan-nili-jie-sita
Advanced resources
Erlang in Anger https://ymotongpoo.github.io/erlang-in-anger/text-ja.pdf You want to read this… before
production.
https://speakerdeck.com/ne_sachirou/sutetohurudeda-gui-mo- akusesufalsearusoft-realtimenagemusabawoeasynitukuru
https://speakerdeck.com/ne_sachirou/elixir-on-containers
https://speakerdeck.com/ne_sachirou/phoenix-at-scale
https://speakerdeck.com/ne_sachirou/ddd-data-driven-development