Add option to use CommitLanguages RPC

GITALY_SERVER_VERSION

-0.25.0
+0.26.0

app/controllers/projects/graphs_controller.rb

@@ -43,23 +43,7 @@ class Projects::GraphsController < Projects::ApplicationController
   end
 
   def get_languages
-    @languages = Linguist::Repository.new(@repository.rugged, @repository.rugged.head.target_id).languages
-    total = @languages.map(&:last).sum
-
-    @languages = @languages.map do |language|
-      name, share = language
-      color = Linguist::Language[name].color || "##{Digest::SHA256.hexdigest(name)[0...6]}"
-      {
-        value: (share.to_f * 100 / total).round(2),
-        label: name,
-        color: color,
-        highlight: color
-      }
-    end
-
-    @languages.sort! do |x, y|
-      y[:value] <=> x[:value]
-    end
+    @languages = @project.repository.languages
   end
 
   def fetch_graph

lib/gitlab/git/repository.rb

@@ -636,6 +636,33 @@ module Gitlab
         @attributes.attributes(path)
       end
 
+      def languages(ref = nil)
+        Gitlab::GitalyClient.migrate(:commit_languages) do |is_enabled|
+          if is_enabled
+            gitaly_commit_client.languages(ref)
+          else
+            ref ||= rugged.head.target_id
+            languages = Linguist::Repository.new(rugged, ref).languages
+            total = languages.map(&:last).sum
+
+            languages = languages.map do |language|
+              name, share = language
+              color = Linguist::Language[name].color || "##{Digest::SHA256.hexdigest(name)[0...6]}"
+              {
+                value: (share.to_f * 100 / total).round(2),
+                label: name,
+                color: color,
+                highlight: color
+              }
+            end
+
+            languages.sort do |x, y|
+              y[:value] <=> x[:value]
+            end
+          end
+        end
+      end
+
       def gitaly_repository
         Gitlab::GitalyClient::Util.repository(@storage, @relative_path)
       end

lib/gitlab/gitaly_client/commit_service.rb

@@ -118,6 +118,13 @@ module Gitlab
         consume_commits_response(response)
       end
 
+      def languages(ref = nil)
+        request = Gitaly::CommitLanguagesRequest.new(repository: @gitaly_repo, revision: ref || '')
+        response = GitalyClient.call(@repository.storage, :commit_service, :commit_languages, request)
+
+        response.languages.map { |l| { value: l.share.round(2), label: l.name, color: l.color, highlight: l.color } }
+      end
+
       private
 
       def commit_diff_request_params(commit, options = {})

spec/controllers/projects/graphs_controller_spec.rb

@@ -24,37 +24,4 @@ describe Projects::GraphsController do
       expect(response).to redirect_to action: :charts
     end
   end
-
-  describe 'GET charts' do
-    let(:linguist_repository) do
-      double(languages: {
-               'Ruby'         => 1000,
-               'CoffeeScript' => 350,
-               'NSIS'         => 15
-             })
-    end
-
-    let(:expected_values) do
-      nsis_color = "##{Digest::SHA256.hexdigest('NSIS')[0...6]}"
-      [
-        # colors from Linguist:
-        { label: "Ruby",         color: "#701516",  highlight: "#701516" },
-        { label: "CoffeeScript", color: "#244776",  highlight: "#244776" },
-        # colors from SHA256 fallback:
-        { label: "NSIS",         color: nsis_color, highlight: nsis_color }
-      ]
-    end
-
-    before do
-      allow(Linguist::Repository).to receive(:new).and_return(linguist_repository)
-    end
-
-    it 'sets the correct colour according to language' do
-      get(:charts, namespace_id: project.namespace, project_id: project, id: 'master')
-
-      expected_values.each do |val|
-        expect(assigns(:languages)).to include(a_hash_including(val))
-      end
-    end
-  end
 end

spec/lib/gitlab/git/repository_spec.rb

@@ -1127,6 +1127,45 @@ describe Gitlab::Git::Repository, seed_helper: true do
     end
   end
 
+  describe '#languages' do
+    shared_examples 'languages' do
+      it 'returns exactly the expected results' do
+        languages = repository.languages('4b4918a572fa86f9771e5ba40fbd48e1eb03e2c6')
+        expected_languages = [
+          { value: 66.63, label: "Ruby", color: "#701516", highlight: "#701516" },
+          { value: 22.96, label: "JavaScript", color: "#f1e05a", highlight: "#f1e05a" },
+          { value: 7.9, label: "HTML", color: "#e44b23", highlight: "#e44b23" },
+          { value: 2.51, label: "CoffeeScript", color: "#244776", highlight: "#244776" }
+        ]
+
+        expect(languages.size).to eq(expected_languages.size)
+
+        expected_languages.size.times do |i|
+          a = expected_languages[i]
+          b = languages[i]
+
+          expect(a.keys.sort).to eq(b.keys.sort)
+          expect(a[:value]).to be_within(0.1).of(b[:value])
+
+          non_float_keys = a.keys - [:value]
+          expect(a.values_at(*non_float_keys)).to eq(b.values_at(*non_float_keys))
+        end
+      end
+
+      it "uses the repository's HEAD when no ref is passed" do
+        lang = repository.languages.first
+
+        expect(lang[:label]).to eq('Ruby')
+      end
+    end
+
+    it_behaves_like 'languages'
+
+    context 'with rugged', skip_gitaly_mock: true do
+      it_behaves_like 'languages'
+    end
+  end
+
   def create_remote_branch(repository, remote_name, branch_name, source_branch_name)
     source_branch = repository.branches.find { |branch| branch.name == source_branch_name }
     rugged = repository.rugged