Mozart

Envelopes

@integralist

What?

Mozart:

page composition as a service

Envelope:

component/message container

Where?

  • github.com/BBC-News/composition
  • github.com/BBC-News/composition-example
  • github.com/BBC-News/mozart-composition

Envelopes?

  • An envelope is simply an interface
  • An envelope contains component information
  • An envelope is a response to a HTTP request

Envelope

{
  key: "",
  head: "",
  bodyfirst: "",
  bodylast: "",
}

Interaction

Request

  • A page is made up of multiple components
  • We make a request for each component
  • The request will be to a HTTP endpoint
  • We'll pass a component identifier 'key' (query param vs REST?)
  • The key enables us to enforce component order
  • The envelope should include/return the identifier key

Request Construction

  • Components are defined in YAML config
  • We have three levels of config
    • Page (e.g. home_page)
    • Base (e.g. furniture, such as ORB)
    • Default (e.g. missing settings, config inheritance) 
  • http://<base_url>/<component.id>?<opts>

Example Page YAML

base_url: "https://s3-eu-west-1.amazonaws.com/components"

components:
  - id: 'meta-author'

  - id: 'orb-header'
    mandatory: true

  - id: 'articles'
    mandatory: true
    opts:
      - count: 10

  - id: 'orb-footer'
    mandatory: true

Example Page Mustache

<html lang="en-GB">
<head>
    <title>My Home Page</title>
    <link href="/css/home_page.css" rel="stylesheet" />
    {{{ head }}}
</head>
<body>
  <div id="center">
    {{{ bodyfirst }}}
  </div>
  {{{ bodylast }}}
</body>
</html>

Interpolation

Discussion

Mozart/Envelope

By Mark McDonnell

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Mozart/Envelope

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