tiles.each{ |args|
  CrawlWorker.perform_async(args)

CrawlWorker.cancel!(jid)

def cancelled?
  Sidekiq.redis {|c| c.exists("cancelled-#{jid}") }
end

def self.cancel!(jid)=
  Sidekiq.redis {|c| c.setex("cancelled-#{jid}", 86400, 1) }
end

def perform(args)
  return if cancelled?