tlwr/app.rb

## app.rb
require 'base64'
require 'http'
require 'rufus-scheduler'
require 'sinatra'

GH_URL = 'https://api.github.com/repos/alphagov/govdesign/contents'

STATE = {
  lock: Mutex.new,
  bytes: nil,
}

SCHEDULER = Rufus::Scheduler.new

LOADING_TEMPLATE = <<~HTML.freeze
  <!doctype HTML>
  <html>
    <head><title>govdesign.cloudapps.digital</title></head>
    <body>loading</body>
  </html>
HTML

PAGE_TEMPLATE = <<~HTML.freeze
  <!doctype HTML>
  <html>
    <head><title>govdesign.cloudapps.digital</title></head>
    <body style="display: flex; justify-content: center; align-items: center;">
      <main id="pdf">
        <embed width="700" height="700" src="/poster.pdf#toolbar=0&navpanes=0&scrollbar=0&statusbar=0&messages=0&scrollbar=0">
        </embed>
      </main>
    </body>
  </html>
HTML

def get_random_poster
  files = JSON.parse(HTTP.get(GH_URL).to_s)

  pdfs = files.select { |f| f['name'] =~ /[.]pdf$/ }
  posters = pdfs.select { |p| p['name'] =~ /poster/i }
  small_posters = posters.select { |p| p['size'] < 204800 }
  poster = small_posters.shuffle.first
  poster_url = poster['download_url']

  bytes = HTTP.follow.get(poster_url).to_s

  STATE[:lock].synchronize { STATE[:bytes] = bytes }
end

SCHEDULER.every('15m') { get_random_poster }
get_random_poster

set :port, 8080

get '/' do
  bytes = STATE[:lock].synchronize { STATE[:bytes] }

  if bytes.nil?
    LOADING_TEMPLATE
  else
    PAGE_TEMPLATE
  end
end

get '/poster.pdf' do
  content_type 'application/pdf'
  STATE[:lock].synchronize { STATE[:bytes] }
end
	require 'base64'
	require 'http'
	require 'rufus-scheduler'
	require 'sinatra'

	GH_URL = 'https://api.github.com/repos/alphagov/govdesign/contents'

	STATE = {
	lock: Mutex.new,
	bytes: nil,
	}

	SCHEDULER = Rufus::Scheduler.new

	LOADING_TEMPLATE = <<~HTML.freeze
	<!doctype HTML>
	<html>
	<head><title>govdesign.cloudapps.digital</title></head>
	<body>loading</body>
	</html>
	HTML

	PAGE_TEMPLATE = <<~HTML.freeze
	<!doctype HTML>
	<html>
	<head><title>govdesign.cloudapps.digital</title></head>
	<body style="display: flex; justify-content: center; align-items: center;">
	<main id="pdf">
	<embed width="700" height="700" src="/poster.pdf#toolbar=0&navpanes=0&scrollbar=0&statusbar=0&messages=0&scrollbar=0">
	</embed>
	</main>
	</body>
	</html>
	HTML

	def get_random_poster
	files = JSON.parse(HTTP.get(GH_URL).to_s)

	pdfs = files.select { \|f\| f['name'] =~ /[.]pdf$/ }
	posters = pdfs.select { \|p\| p['name'] =~ /poster/i }
	small_posters = posters.select { \|p\| p['size'] < 204800 }
	poster = small_posters.shuffle.first
	poster_url = poster['download_url']

	bytes = HTTP.follow.get(poster_url).to_s

	STATE[:lock].synchronize { STATE[:bytes] = bytes }
	end

	SCHEDULER.every('15m') { get_random_poster }
	get_random_poster

	set :port, 8080

	get '/' do
	bytes = STATE[:lock].synchronize { STATE[:bytes] }

	if bytes.nil?
	LOADING_TEMPLATE
	else
	PAGE_TEMPLATE
	end
	end

	get '/poster.pdf' do
	content_type 'application/pdf'
	STATE[:lock].synchronize { STATE[:bytes] }
	end