Experimental Async Refreshes API (#34918)

app/models/home_feed.rb

@@ -6,15 +6,39 @@ class HomeFeed < Feed
     super(:home, account.id)
   end
 
+  def async_refresh
+    @async_refresh ||= AsyncRefresh.new(redis_regeneration_key)
+  end
+
   def regenerating?
-    redis.exists?("account:#{@account.id}:regeneration")
+    async_refresh.running?
+  rescue Redis::CommandError
+    retry if upgrade_redis_key!
   end
 
   def regeneration_in_progress!
-    redis.set("account:#{@account.id}:regeneration", true, nx: true, ex: 1.day.seconds)
+    @async_refresh = AsyncRefresh.create(redis_regeneration_key)
+  rescue Redis::CommandError
+    upgrade_redis_key!
   end
 
   def regeneration_finished!
-    redis.del("account:#{@account.id}:regeneration")
+    async_refresh.finish!
+  rescue Redis::CommandError
+    retry if upgrade_redis_key!
+  end
+
+  private
+
+  def redis_regeneration_key
+    @redis_regeneration_key = "account:#{@account.id}:regeneration"
+  end
+
+  def upgrade_redis_key!
+    if redis.type(redis_regeneration_key) == 'string'
+      redis.del(redis_regeneration_key)
+      regeneration_in_progress!
+      true
+    end
   end
 end