Faster search

app/models/repository.rb

@@ -1064,6 +1064,10 @@ class Repository
   end
 
   def search_files(query, ref)
+    unless exists? && has_visible_content? && query.present?
+      return []
+    end
+
     offset = 2
     args = %W(#{Gitlab.config.git.bin_path} grep -i -I -n --before-context #{offset} --after-context #{offset} -E -e #{Regexp.escape(query)} #{ref || root_ref})
     Gitlab::Popen.popen(args, path_to_repo).first.scrub.split(/^--$/)

changelogs/unreleased/faster_project_search.yml

+---
+title: Faster search inside Project
+merge_request: 
+author: 

lib/gitlab/project_search_results.rb

@@ -5,11 +5,7 @@ module Gitlab
     def initialize(current_user, project, query, repository_ref = nil)
       @current_user = current_user
       @project = project
-      @repository_ref = if repository_ref.present?
-                          repository_ref
-                        else
-                          nil
-                        end
+      @repository_ref = repository_ref.presence
       @query = query
     end
 
@@ -47,14 +43,11 @@ module Gitlab
     private
 
     def blobs
-      if project.empty_repo? || query.blank?
-        []
-      else
-        project.repository.search_files(query, repository_ref)
-      end
+      @blobs ||= project.repository.search_files(query, repository_ref)
     end
 
     def wiki_blobs
+      @wiki_blobs ||= begin
         if project.wiki_enabled? && query.present?
           project_wiki = ProjectWiki.new(project)
 
@@ -67,13 +60,14 @@ module Gitlab
           []
         end
       end
+    end
 
     def notes
-      project.notes.user.search(query, as_user: @current_user).order('updated_at DESC')
+      @notes ||= project.notes.user.search(query, as_user: @current_user).order('updated_at DESC')
     end
 
     def commits
-      project.repository.find_commits_by_message(query)
+      @commits ||= project.repository.find_commits_by_message(query)
     end
 
     def project_ids_relation

spec/models/repository_spec.rb

@@ -362,6 +362,19 @@ describe Repository, models: true do
       expect(results.first).not_to start_with('fatal:')
     end
 
+    it 'properly handles when query is not present' do
+      results = repository.search_files('', 'master')
+
+      expect(results).to match_array([])
+    end
+
+    it 'properly handles query when repo is empty' do
+      repository = create(:empty_project).repository
+      results = repository.search_files('test', 'master')
+
+      expect(results).to match_array([])
+    end
+
     describe 'result' do
       subject { results.first }