How to publish an event asynchronously from a simple ruby script using keen-gem

publish_async.rb

require "keen"
require "em-http-request"

# make sure the environment is set up 
ENV["KEEN_PROJECT_ID"] = "..."
ENV["KEEN_WRITE_KEY"] = "..."
 
Thread.new { EventMachine.run }
sleep 1
 
http = Keen.publish_async(:sign_ups, {
  username: "dzello"
})
 
http.callback do |response| 
   puts "Success: #{response}"
   # now we can exit the process
   exit
end

http.errback do |e|
  puts "was a failurrr :,("
  exit
end

# keep this thread running so the process stays up
while true
  sleep 1
end

Isn't it better to just join with the EM thread instead of looping a sleep?