Merge branch 'fix-banzai-cache' into 'master'

Fix mentionable reference extraction caching.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/4130

Reverts https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2120 and https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2283

See merge request !2315

app/models/concerns/mentionable.rb

@@ -51,8 +51,11 @@ module Mentionable
     else
       self.class.mentionable_attrs.each do |attr, options|
         text = send(attr)
-        options[:cache_key] = [self, attr] if options.delete(:cache) && self.persisted?
-        ext.analyze(text, options)
+
+        context = options.dup
+        context[:cache_key] = [self, attr] if context.delete(:cache) && self.persisted?
+
+        ext.analyze(text, context)
       end
     end
 

lib/banzai/renderer.rb

@@ -18,22 +18,13 @@ module Banzai
       cache_key = context.delete(:cache_key)
       cache_key = full_cache_key(cache_key, context[:pipeline])
 
-      cacheless = cacheless_render(text, context)
-
-      if cache_key && ENV["DEBUG_BANZAI_CACHE"]
-        cached = Rails.cache.fetch(cache_key) { cacheless }
-
-        if cached != cacheless
-          Rails.logger.warn "Banzai cache mismatch"
-          Rails.logger.warn "Text: #{text.inspect}"
-          Rails.logger.warn "Context: #{context.inspect}"
-          Rails.logger.warn "Cache key: #{cache_key.inspect}"
-          Rails.logger.warn "Cacheless: #{cacheless.inspect}"
-          Rails.logger.warn "With cache: #{cached.inspect}"
+      if cache_key
+        Rails.cache.fetch(cache_key) do
+          cacheless_render(text, context)
         end
+      else
+        cacheless_render(text, context)
       end
-
-      cacheless
     end
 
     def self.render_result(text, context = {})

spec/models/note_spec.rb

@@ -125,6 +125,19 @@ describe Note, models: true do
     let(:set_mentionable_text) { ->(txt) { subject.note = txt } }
   end
 
+  describe "#all_references" do
+    let!(:note1) { create(:note) }
+    let!(:note2) { create(:note) }
+
+    it "reads the rendered note body from the cache" do
+      expect(Banzai::Renderer).to receive(:render).with(note1.note, pipeline: :note, cache_key: [note1, "note"], project: note1.project)
+      expect(Banzai::Renderer).to receive(:render).with(note2.note, pipeline: :note, cache_key: [note2, "note"], project: note2.project)
+
+      note1.all_references
+      note2.all_references
+    end
+  end
+
   describe :search do
     let!(:note) { create(:note, note: "WoW") }
 
@@ -164,7 +177,7 @@ describe Note, models: true do
       expect(note.editable?).to be_falsy
     end
   end
-  
+
   describe "set_award!" do
     let(:issue) { create :issue }