Incorporate RefsService.FindAllBranches Gitaly RPC

lib/gitlab/git.rb

@@ -10,7 +10,7 @@ module Gitlab
       include Gitlab::EncodingHelper
 
       def ref_name(ref)
-        encode! ref.sub(/\Arefs\/(tags|heads)\//, '')
+        encode! ref.sub(/\Arefs\/(tags|heads|remotes)\//, '')
       end
 
       def branch_name(ref)

lib/gitlab/git/repository.rb

@@ -82,10 +82,14 @@ module Gitlab
       end
 
       # Returns an Array of Branches
-      #
-      # Gitaly migration: https://gitlab.com/gitlab-org/gitaly/issues/389
-      def branches(sort_by: nil)
-        branches_filter(sort_by: sort_by)
+      def branches
+        gitaly_migrate(:branches) do |is_enabled|
+          if is_enabled
+            gitaly_ref_client.branches
+          else
+            branches_filter
+          end
+        end
       end
 
       def reload_rugged

lib/gitlab/gitaly_client/ref_service.rb

@@ -10,6 +10,19 @@ module Gitlab
         @storage = repository.storage
       end
 
+      def branches
+        request = Gitaly::FindAllBranchesRequest.new(repository: @gitaly_repo)
+        response = GitalyClient.call(@storage, :ref_service, :find_all_branches, request)
+
+        response.flat_map do |message|
+          message.branches.map do |branch|
+            gitaly_commit = GitalyClient::Commit.new(@repository, branch.target)
+            target_commit = Gitlab::Git::Commit.decorate(gitaly_commit)
+            Gitlab::Git::Branch.new(@repository, branch.name, branch.target.id, target_commit)
+          end
+        end
+      end
+
       def default_branch_name
         request = Gitaly::FindDefaultBranchNameRequest.new(repository: @gitaly_repo)
         response = GitalyClient.call(@storage, :ref_service, :find_default_branch_name, request)

spec/lib/gitlab/git/repository_spec.rb

@@ -939,16 +939,21 @@ describe Gitlab::Git::Repository, seed_helper: true do
     context 'with deleted branch with Gitaly disabled' do
       before do
         allow(Gitlab::GitalyClient).to receive(:feature_enabled?).and_return(false)
+      end
+
+      it 'returns no results' do
         ref = double()
         allow(ref).to receive(:name) { 'bad-branch' }
         allow(ref).to receive(:target) { raise Rugged::ReferenceError }
         branches = double()
         allow(branches).to receive(:each) { [ref].each }
         allow(repository.rugged).to receive(:branches) { branches }
-      end
 
-      it { is_expected.to eq([]) }
+        expect(subject).to be_empty
+      end
     end
+
+    it_behaves_like 'wrapping gRPC errors', Gitlab::GitalyClient::RefService, :branches
   end
 
   describe '#branch_count' do

spec/lib/gitlab/gitaly_client/ref_service_spec.rb

@@ -6,6 +6,17 @@ describe Gitlab::GitalyClient::RefService do
   let(:relative_path) { project.path_with_namespace + '.git' }
   let(:client) { described_class.new(project.repository) }
 
+  describe '#branches' do
+    it 'sends a find_all_branches message' do
+      expect_any_instance_of(Gitaly::RefService::Stub)
+        .to receive(:find_all_branches)
+        .with(gitaly_request_with_path(storage_name, relative_path), kind_of(Hash))
+        .and_return([])
+
+      client.branches
+    end
+  end
+
   describe '#branch_names' do
     it 'sends a find_all_branch_names message' do
       expect_any_instance_of(Gitaly::RefService::Stub)