Add --skip-filled-timeline option to tootctl feed build to skip half-filled feeds (#33844)

app/lib/feed_manager.rb

@@ -32,6 +32,15 @@ class FeedManager
     "feed:#{type}:#{id}:#{subtype}"
   end
 
+  # The number of items in the given timeline
+  # @param [Symbol] type
+  # @param [Integer] id
+  # @param [Symbol] subtype
+  # @return [Integer]
+  def timeline_size(type, id, subtype = nil)
+    redis.zcard(key(type, id, subtype))
+  end
+
   # The filter result of the status to a particular feed
   # @param [Symbol] timeline_type
   # @param [Status] status

app/services/precompute_feed_service.rb

@@ -3,13 +3,21 @@
 class PrecomputeFeedService < BaseService
   include Redisable
 
-  def call(account)
-    FeedManager.instance.populate_home(account)
+  def call(account, skip_filled_timelines: false)
+    @skip_filled_timelines = skip_filled_timelines
+
+    FeedManager.instance.populate_home(account) unless skip_timeline?(:home, account.id)
 
     account.owned_lists.each do |list|
-      FeedManager.instance.populate_list(list)
+      FeedManager.instance.populate_list(list) unless skip_timeline?(:list, list.id)
     end
   ensure
     redis.del("account:#{account.id}:regeneration")
   end
+
+  private
+
+  def skip_timeline?(type, id)
+    @skip_filled_timelines && FeedManager.instance.timeline_size(type, id) * 2 > FeedManager::MAX_ITEMS
+  end
 end