Post on 11-Feb-2017
@MichaelLNorth
Phoenix for Rubyists
Rubyconf Brazil 2016
Mike North CTO, Levanto Financial
image credit: http://phoenix-mask.deviantart.com/art/Ruby-Heart-s-Cutie-Mark-600784264
@MichaelLNorth
My Perspective
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Origins
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Concurrency +
Rails
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@MichaelLNorth
@MichaelLNorth
📱📱
📱📱
🗼
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Ericsson AXE Switch (1976 - Present)
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📱📱
📱📱
🗼
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🖥📱
💻☁
☁
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🖥📱
💻☁ ☁
☁
@MichaelLNorth
Concurrency📱📱
📱📱
🗼
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Performance
RubyErlang
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Fault Tolerance
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Beautiful Syntax & Developer Ergonomics
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Beautiful Syntax & Developer Ergonomics
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@MichaelLNorth
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TL;DR
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TL;DR Functional
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TL;DR Functional Immutable
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TL;DR Functional Immutable
BEAM
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TL;DR Functional Immutable
BEAM Extensible
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Apps
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S
S
W W W
Hierarchy of Apps
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|>
Pipe Forward
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|>
Pipe Forward
@MichaelLNorth
val |> func
Pipe Forward
func(val)
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val |> func(b)
Pipe Forward
func(val, b)
@MichaelLNorth
val |> func(b) |> other(c) |> more(d)
Pipe Forward
more(other(func(val, b), c), d)
@MichaelLNorth
Connection
@MichaelLNorth
conn
Request Body Request Params Request Headers Request Origin
Response Body Response Status Code
Response Headers
new_conn
Request Body Request Params Request Headers Request Origin
Response Body Response Status Code
Response Headers
@MichaelLNorth
Phoenix, Abbreviated
new_conn = conn |> MyApp.handleRequest
@MichaelLNorth
@MichaelLNorth
Start your app
Start your app (w/ CLI)
Create your DB
@MichaelLNorth
RakeBundler MIX
An Elixir App (with Phoenix 1.2)
Beam files
An Elixir App (with Phoenix 1.2)
App configuration
An Elixir App (with Phoenix 1.2)
Dependency Source Code
An Elixir App (with Phoenix 1.2)
Application (non-web)
An Elixir App (with Phoenix 1.2)
Elixir Package Manifest++
An Elixir App (with Phoenix 1.2)
JS Dependency Source
An Elixir App (with Phoenix 1.2)
JS Package Manifest
An Elixir App (with Phoenix 1.2)
DB stuff, Static assets
An Elixir App (with Phoenix 1.2)
Guess what this is
An Elixir App (with Phoenix 1.2)
Application (web)
An Elixir App (with Phoenix 1.2)
98% of your time
An Elixir App (with Phoenix 1.2)
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Start the server
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What’s going on?URL
Pipeline Parameters Controller Action
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Endpoint
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Multiplexing Socket
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Serve static assets
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Request ID
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Request Logging
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Request body normalization
into JSON
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AJAX DELETE/PATCH/PUT
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AJAX HEAD
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Session
@MichaelLNorthYour app’s router
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Phoenix, Abbreviated
new_conn = conn |> Lots of plugs |> Router
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Routing
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pipeline(chain of plugs) Content-type
Use sessionNotificationsCSRFx-frame, etc…
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Scope
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ActionControllerPathVerb
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Controllers
@MichaelLNorth
RENDER
•Can specify a view, but we didn’t
•Default behavior: name-matching
render(conn, view, template, assigns)
RENDER
•Can specify a view, but we didn’t
•Default behavior: name-matching
render(conn, template, assigns)
Implied: use view with the same name
RENDER
•Can specify a view, but we didn’t
•Default behavior: name-matching
render(conn, template_or_assigns)
Implied: use view with the same name
@MichaelLNorth
Base Controller
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Filters
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View Layer
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web/controllers/page_controller.ex web/templates/page/index.html.eex
web/views/page_view.ex
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@MichaelLNorth
Model Layer
mix phoenix.gen.model User \ users \ name:string \ username:string \ password_hash:string
Model Name
mix phoenix.gen.model User \ users \ name:string \ username:string \ password_hash:string
Table Name
mix phoenix.gen.model User \ users \ name:string \ username:string \ password_hash:string
Schema
model test
model
db migration
SCHEMA
CHANGESET STUFF
WEB/MODELS/USER.EX
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Migrating
@MichaelLNorth
Migrating
• One-shot rewrites are expensive and dangerous
• You suffer, your company suffers, your users suffer
• Incremental change makes everyone happier
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Reverse Proxy
Rails Phoenix
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Reverse Proxy
Phoenix Rails
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Terraformpoteto/terraform
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Phoenix is the future
@MichaelLNorth
You have an advantage
Phoenix is the future
@MichaelLNorth
You have an advantage
Phoenix is the future
Learn it, try it, use it!
@MichaelLNorth
•https://www.toptal.com/erlang/a-cloud-at-the-lowest-level-built-in-erlang •https://en.wikipedia.org/wiki/Moore%27s_law •https://theerlangelist.blogspot.in/2013/05/working-with-immutable-data.html •https://www.amberbit.com/blog/2014/2/14/putting-ruby-on-rails-on-a-diet/ •https://www.technologyreview.com/s/601441/moores-law-is-dead-now-what/
IMAGE & DIAGRAM CREDITS
Thanks!
I’m available for elixir training & consulting!
michael.l.north@gmail.com