Implement includes caching for timelines APIs

1 files changed, 23 insertions, 0 deletions

diff --git a/app/controllers/api/v1/timelines_controller.rb b/app/controllers/api/v1/timelines_controller.rb
index c5ed315d9..b1d7c3052 100644
--- a/app/controllers/api/v1/timelines_controller.rb
+++ b/app/controllers/api/v1/timelines_controller.rb
@@ -38,6 +38,7 @@ class Api::V1::TimelinesController < ApiController
 
   def public
     @statuses = Status.as_public_timeline(current_account).paginate_by_max_id(DEFAULT_STATUSES_LIMIT, params[:max_id], params[:since_id]).to_a
+    @statuses = cache(@statuses)
 
     set_maps(@statuses)
     set_counters_maps(@statuses)
@@ -54,6 +55,7 @@ class Api::V1::TimelinesController < ApiController
   def tag
     @tag      = Tag.find_by(name: params[:id].downcase)
     @statuses = @tag.nil? ? [] : Status.as_tag_timeline(@tag, current_account).paginate_by_max_id(DEFAULT_STATUSES_LIMIT, params[:max_id], params[:since_id]).to_a
+    @statuses = cache(@statuses)
 
     set_maps(@statuses)
     set_counters_maps(@statuses)
@@ -66,4 +68,25 @@ class Api::V1::TimelinesController < ApiController
 
     render action: :index
   end
+
+  private
+
+  def cache(raw)
+    uncached_ids           = []
+    cached_keys_with_value = Rails.cache.read_multi(*raw.map(&:cache_key))
+
+    raw.each do |status|
+      uncached_ids << status.id unless cached_keys_with_value.key?(status.cache_key)
+    end
+
+    unless uncached_ids.empty?
+      uncached = Status.where(id: uncached_ids).with_includes.map { |s| [s.id, s] }.to_h
+
+      uncached.values.each do |status|
+        Rails.cache.write(status.cache_key, status)
+      end
+    end
+
+    raw.map { |status| cached_keys_with_value[status.cache_key] || uncached[status.id] }
+  end
 end