1 files changed, 32 insertions, 0 deletions
diff --git a/lib/gitlab/graphql/limit/field_call_count.rb b/lib/gitlab/graphql/limit/field_call_count.rb
new file mode 100644
index 00000000000..4165970a2a6
--- /dev/null
+++ b/lib/gitlab/graphql/limit/field_call_count.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Graphql
+    module Limit
+      class FieldCallCount < ::GraphQL::Schema::FieldExtension
+        def resolve(object:, arguments:, context:)
+          raise Gitlab::Graphql::Errors::ArgumentError, 'Limit must be specified.' unless limit
+          raise Gitlab::Graphql::Errors::LimitError, error_message if increment_call_count(context) > limit
+
+          yield(object, arguments)
+        end
+
+        private
+
+        def increment_call_count(context)
+          context[:call_count] ||= {}
+          context[:call_count][field] ||= 0
+          context[:call_count][field] += 1
+        end
+
+        def limit
+          options[:limit]
+        end
+
+        def error_message
+          "\"#{field.graphql_name}\" field can be requested only for #{limit} #{field.owner.graphql_name}(s) at a time."
+        end
+      end
+    end
+  end
+end