Make SnapshotWorker a Sidekiq based worker

app/controllers/api/asciicasts_controller.rb

@@ -5,7 +5,7 @@ class Api::AsciicastsController < ApplicationController
     ac = Asciicast.new(params[:asciicast])
 
     if ac.save
-      SnapshotQueue.push ac.id
+      SnapshotWorker.perform_async(ac.id)
       render :text => asciicast_url(ac), :status => :created, :location => ac
     else
       render :text => ac.errors.full_messages, :status => 422

app/queues/snapshot_queue.rb

@@ -1,13 +0,0 @@
-class SnapshotQueue < GirlFriday::WorkQueue
-  include Singleton
-
-  def initialize
-    super(:snapshot_queue, :size => 3) do |asciicast_id|
-      SnapshotWorker.new.perform(asciicast_id)
-    end
-  end
-
-  def self.push *args
-    instance.push *args
-  end
-end

app/workers/snapshot_worker.rb

@@ -1,4 +1,6 @@
 class SnapshotWorker
+  include Sidekiq::Worker
+
   def perform(asciicast_id)
     AsciicastSnapshotter.new(asciicast_id).run
   end