Expand FindCommit caching to blob and refs

This enables FindCommit caching to the following actions:

* BlobController#show
* RefsController#logs_tree

It also improves caching in CommitsController since some
duplicate requests were occuring inside the before_action
definitions.

app/controllers/projects/blob_controller.rb

@@ -9,6 +9,8 @@ class Projects::BlobController < Projects::ApplicationController
   include ActionView::Helpers::SanitizeHelper
   prepend_before_action :authenticate_user!, only: [:edit]
 
+  around_action :allow_gitaly_ref_name_caching, only: [:show]
+
   before_action :require_non_empty_project, except: [:new, :create]
   before_action :authorize_download_code!
 

app/controllers/projects/commits_controller.rb

@@ -7,6 +7,7 @@ class Projects::CommitsController < Projects::ApplicationController
   include RendersCommits
 
   prepend_before_action(only: [:show]) { authenticate_sessionless_user!(:rss) }
+  around_action :allow_gitaly_ref_name_caching
   before_action :whitelist_query_limiting, except: :commits_root
   before_action :require_non_empty_project
   before_action :assign_ref_vars, except: :commits_root
@@ -14,8 +15,6 @@ class Projects::CommitsController < Projects::ApplicationController
   before_action :validate_ref!, except: :commits_root
   before_action :set_commits, except: :commits_root
 
-  around_action :allow_gitaly_ref_name_caching
-
   def commits_root
     redirect_to project_commits_path(@project, @project.default_branch)
   end

app/controllers/projects/refs_controller.rb

@@ -4,6 +4,8 @@ class Projects::RefsController < Projects::ApplicationController
   include ExtractsPath
   include TreeHelper
 
+  around_action :allow_gitaly_ref_name_caching, only: [:logs_tree]
+
   before_action :require_non_empty_project
   before_action :validate_ref_id
   before_action :assign_ref_vars

app/controllers/projects_controller.rb

@@ -10,6 +10,8 @@ class ProjectsController < Projects::ApplicationController
 
   prepend_before_action(only: [:show]) { authenticate_sessionless_user!(:rss) }
 
+  around_action :allow_gitaly_ref_name_caching, only: [:index, :show]
+
   before_action :whitelist_query_limiting, only: [:create]
   before_action :authenticate_user!, except: [:index, :show, :activity, :refs, :resolve]
   before_action :redirect_git_extension, only: [:show]
@@ -26,8 +28,6 @@ class ProjectsController < Projects::ApplicationController
   before_action :authorize_admin_project!, only: [:edit, :update, :housekeeping, :download_export, :export, :remove_export, :generate_new_export]
   before_action :event_filter, only: [:show, :activity]
 
-  around_action :allow_gitaly_ref_name_caching, only: [:index, :show]
-
   layout :determine_layout
 
   def index

changelogs/unreleased/sh-improve-find-commit-caching.yml

+---
+title: Expand FindCommit caching to blob and refs
+merge_request: 27084
+author:
+type: performance

spec/controllers/projects/blob_controller_spec.rb

@@ -10,6 +10,8 @@ describe Projects::BlobController do
 
     context 'with file path' do
       before do
+        expect(::Gitlab::GitalyClient).to receive(:allow_ref_name_caching).and_call_original
+
         get(:show,
             params: {
               namespace_id: project.namespace,

spec/controllers/projects/refs_controller_spec.rb

@@ -44,11 +44,15 @@ describe Projects::RefsController do
     end
 
     it 'renders JS' do
+      expect(::Gitlab::GitalyClient).to receive(:allow_ref_name_caching).and_call_original
+
       xhr_get(:js)
       expect(response).to be_success
     end
 
     it 'renders JSON' do
+      expect(::Gitlab::GitalyClient).to receive(:allow_ref_name_caching).and_call_original
+
       xhr_get(:json)
 
       expect(response).to be_success