fetcher_async.rb

puts "1) Fetching data"
http = EventMachine::HttpRequest.new("https://api.bitcoinaverage.com/ticker/global/all").get

http.errback { p '3) Not-done! Error!'; EM.stop }
http.callback do
    # 1 second later
    $redis.set(response_body["data"])
    puts "3) Storing fetched data"
    p http.response_header.status
    p http.response_header
    p http.response
    puts "4) Done!"

    EventMachine.stop
end

puts "2) Doing other things"