Migrate Gitlab::Git::Repository#size to Gitaly

Closes gitaly#437

GITALY_SERVER_VERSION

-0.27.0
+0.29.0

Gemfile

@@ -391,7 +391,7 @@ gem 'vmstat', '~> 2.3.0'
 gem 'sys-filesystem', '~> 1.1.6'
 # Gitaly GRPC client
-gem 'gitaly', '~> 0.24.0'
+gem 'gitaly', '~> 0.26.0'
 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 (0.24.0)
+    gitaly (0.26.0)
       google-protobuf (~> 3.1)
       grpc (~> 1.0)
     github-linguist (4.7.6)
@@ -975,7 +975,7 @@ DEPENDENCIES
   gettext (~> 3.2.2)
   gettext_i18n_rails (~> 1.8.0)
   gettext_i18n_rails_js (~> 1.2.0)
-  gitaly (~> 0.24.0)
+  gitaly (~> 0.26.0)
   github-linguist (~> 4.7.0)
   gitlab-flowdock-git-hook (~> 1.0.1)
   gitlab-markup (~> 1.5.1)

lib/gitlab/git/repository.rb

@@ -282,7 +282,14 @@ module Gitlab
       # Return repo size in megabytes
       def size
-        size = popen(%w(du -sk), path).first.strip.to_i
+        size = gitaly_migrate(:repository_size) do |is_enabled|
+          if is_enabled
+            size_by_gitaly
+          else
+            size_by_shelling_out
+          end
+        end
+
         (size.to_f / 1024).round(2)
       end
@@ -942,6 +949,14 @@ module Gitlab
         gitaly_ref_client.tags
       end
+      def size_by_shelling_out
+        popen(%w(du -sk), path).first.strip.to_i
+      end
+
+      def size_by_gitaly
+        gitaly_repository_client.repository_size
+      end
+
       def count_commits_by_gitaly(options)
         gitaly_commit_client.commit_count(options[:ref], options)
       end

lib/gitlab/gitaly_client/repository_service.rb

@@ -27,6 +27,11 @@ module Gitlab
         request = Gitaly::RepackIncrementalRequest.new(repository: @gitaly_repo)
         GitalyClient.call(@storage, :repository_service, :repack_incremental, request)
       end
+
+      def repository_size
+        request = Gitaly::RepositorySizeRequest.new(repository: @gitaly_repo)
+        GitalyClient.call(@storage, :repository_service, :repository_size, request).size
+      end
     end
   end
 end