Migrate Repository#tags to Gitaly

Closes gitaly#411

GITALY_SERVER_VERSION

-0.23.0
+0.25.0

Gemfile

@@ -391,7 +391,7 @@ gem 'vmstat', '~> 2.3.0'
 gem 'sys-filesystem', '~> 1.1.6'
 
 # Gitaly GRPC client
-gem 'gitaly', '~> 0.18.0'
+gem 'gitaly', '~> 0.21.0'
 
 gem 'toml-rb', '~> 0.3.15', require: false
 

Gemfile.lock

@@ -269,7 +269,7 @@ GEM
       po_to_json (>= 1.0.0)
       rails (>= 3.2.0)
     gherkin-ruby (0.3.2)
-    gitaly (0.18.0)
+    gitaly (0.21.0)
       google-protobuf (~> 3.1)
       grpc (~> 1.0)
     github-linguist (4.7.6)
@@ -976,7 +976,7 @@ DEPENDENCIES
   gettext (~> 3.2.2)
   gettext_i18n_rails (~> 1.8.0)
   gettext_i18n_rails_js (~> 1.2.0)
-  gitaly (~> 0.18.0)
+  gitaly (~> 0.21.0)
   github-linguist (~> 4.7.0)
   gitlab-flowdock-git-hook (~> 1.0.1)
   gitlab-markup (~> 1.5.1)

lib/gitlab/git/repository.rb

@@ -164,20 +164,13 @@ module Gitlab
       #
       # Gitaly migration: https://gitlab.com/gitlab-org/gitaly/issues/390
       def tags
-        rugged.references.each("refs/tags/*").map do |ref|
-          message = nil
-
-          if ref.target.is_a?(Rugged::Tag::Annotation)
-            tag_message = ref.target.message
-
-            if tag_message.respond_to?(:chomp)
-              message = tag_message.chomp
+        gitaly_migrate(:tags) do |is_enabled|
+          if is_enabled
+            tags_from_gitaly
+          else
+            tags_from_rugged
           end
         end
-
-          target_commit = Gitlab::Git::Commit.find(self, ref.target)
-          Gitlab::Git::Tag.new(self, ref.name, ref.target, target_commit, message)
-        end.sort_by(&:name)
       end
 
       # Returns true if the given tag exists
@@ -1115,6 +1108,27 @@ module Gitlab
         end
       end
 
+      def tags_from_rugged
+        rugged.references.each("refs/tags/*").map do |ref|
+          message = nil
+
+          if ref.target.is_a?(Rugged::Tag::Annotation)
+            tag_message = ref.target.message
+
+            if tag_message.respond_to?(:chomp)
+              message = tag_message.chomp
+            end
+          end
+
+          target_commit = Gitlab::Git::Commit.find(self, ref.target)
+          Gitlab::Git::Tag.new(self, ref.name, ref.target, target_commit, message)
+        end.sort_by(&:name)
+      end
+
+      def tags_from_gitaly
+        gitaly_ref_client.tags
+      end
+
       def gitaly_migrate(method, &block)
         Gitlab::GitalyClient.migrate(method, &block)
       rescue GRPC::NotFound => e

lib/gitlab/gitaly_client/ref_service.rb

@@ -52,6 +52,12 @@ module Gitlab
         consume_branches_response(response)
       end
 
+      def tags
+        request = Gitaly::FindAllTagsRequest.new(repository: @gitaly_repo)
+        response = GitalyClient.call(@storage, :ref_service, :find_all_tags, request)
+        consume_tags_response(response)
+      end
+
       private
 
       def consume_refs_response(response)
@@ -79,6 +85,25 @@ module Gitlab
         end
       end
 
+      def consume_tags_response(response)
+        response.flat_map do |message|
+          message.tags.map do |gitaly_tag|
+            if gitaly_tag.target_commit.present?
+              commit = GitalyClient::Commit.new(@repository, gitaly_tag.target_commit)
+              gitaly_commit = Gitlab::Git::Commit.new(commit)
+            end
+
+            Gitlab::Git::Tag.new(
+              @repository,
+              encode!(gitaly_tag.name.dup),
+              gitaly_tag.id,
+              gitaly_commit,
+              encode!(gitaly_tag.message.chomp)
+            )
+          end
+        end
+      end
+
       def commit_from_local_branches_response(response)
         # Git messages have no encoding enforcements. However, in the UI we only
         # handle UTF-8, so basically we cross our fingers that the message force

spec/lib/gitlab/git/tag_spec.rb

@@ -3,6 +3,7 @@ require "spec_helper"
 describe Gitlab::Git::Tag, seed_helper: true do
   let(:repository) { Gitlab::Git::Repository.new('default', TEST_REPO_PATH) }
 
+  shared_examples 'Gitlab::Git::Repository#tags' do
     describe 'first tag' do
       let(:tag) { repository.tags.first }
 
@@ -22,4 +23,13 @@ describe Gitlab::Git::Tag, seed_helper: true do
     end
 
     it { expect(repository.tags.size).to eq(SeedRepo::Repo::TAGS.size) }
+  end
+
+  context 'when Gitaly tags feature is enabled' do
+    it_behaves_like 'Gitlab::Git::Repository#tags'
+  end
+
+  context 'when Gitaly tags feature is disabled', skip_gitaly_mock: true do
+    it_behaves_like 'Gitlab::Git::Repository#tags'
+  end
 end