1 files changed, 36 insertions, 0 deletions
diff --git a/app/graphql/resolvers/ci/runner_resolver.rb b/app/graphql/resolvers/ci/runner_resolver.rb
new file mode 100644
index 00000000000..ca94e28b2e9
--- /dev/null
+++ b/app/graphql/resolvers/ci/runner_resolver.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module Resolvers
+  module Ci
+    class RunnerResolver < BaseResolver
+      include LooksAhead
+
+      type Types::Ci::RunnerType, null: true
+      extras [:lookahead]
+      description 'Runner information.'
+
+      argument :id,
+               type: ::Types::GlobalIDType[::Ci::Runner],
+               required: true,
+               description: 'Runner ID.'
+
+      def resolve_with_lookahead(id:)
+        find_runner(id: id)
+      end
+
+      private
+
+      def find_runner(id:)
+        runner_id = GitlabSchema.parse_gid(id, expected_type: ::Ci::Runner).model_id.to_i
+        preload_tag_list = lookahead.selects?(:tag_list)
+
+        BatchLoader::GraphQL.for(runner_id).batch(key: { preload_tag_list: preload_tag_list }) do |ids, loader, batch|
+          results = ::Ci::Runner.id_in(ids)
+          results = results.with_tags if batch[:key][:preload_tag_list]
+
+          results.each { |record| loader.call(record.id, record) }
+        end
+      end
+    end
+  end
+end