gitlab-org--gitlab-foss/app/services/merge_requests/close_service.rb

module MergeRequests
  class CloseService < MergeRequests::BaseService
    def execute(merge_request, commit = nil)
      return merge_request unless can?(current_user, :update_merge_request, merge_request)

      # If we close MergeRequest we want to ignore validation
      # so we can close broken one (Ex. fork project removed)
      merge_request.allow_broken = true

      if merge_request.close
        create_event(merge_request)
        create_note(merge_request)
        notification_service.close_mr(merge_request, current_user)
        todo_service.close_merge_request(merge_request, current_user)
        execute_hooks(merge_request, 'close')
        invalidate_cache_counts(merge_request, users: merge_request.assignees)
        merge_request.update_project_counter_caches
      end

      merge_request
    end

    private

    def create_event(merge_request)
      # Making sure MergeRequest::Metrics updates are in sync with
      # Event creation.
      Event.transaction do
        close_event = event_service.close_mr(merge_request, current_user)
        merge_request_metrics_service(merge_request).close(close_event)
      end
    end
  end
end