func()

in api/internal/handler/label/label.go [137:270]
111 lines of code
27 McCabe index (conditional complexity)

func (h *Handler) List(c droplet.Context) (interface{}, error) {
	input := c.Input().(*ListInput)

	typ := input.Type
	reqLabels, err := utils.GenLabelMap(input.Label)
	if err != nil {
		return &data.SpecCodeResponse{StatusCode: http.StatusBadRequest},
			fmt.Errorf("%s: \"%s\"", err.Error(), input.Label)
	}

	var items []interface{}
	switch typ {
	case "route":
		items = append(items, h.routeStore)
	case "service":
		items = append(items, h.serviceStore)
	case "consumer":
		items = append(items, h.consumerStore)
	case "ssl":
		items = append(items, h.sslStore)
	case "upstream":
		items = append(items, h.upstreamStore)
	case "plugin_config":
		items = append(items, h.pluginConfigStore)
	case "all":
		items = append(items, h.routeStore, h.serviceStore, h.upstreamStore,
			h.sslStore, h.consumerStore, h.pluginConfigStore)
	}

	predicate := func(obj interface{}) bool {
		var ls map[string]string

		switch obj := obj.(type) {
		case *entity.Route:
			ls = obj.Labels
		case *entity.Consumer:
			ls = obj.Labels
		case *entity.SSL:
			ls = obj.Labels
		case *entity.Service:
			ls = obj.Labels
		case *entity.Upstream:
			ls = obj.Labels
		case *entity.PluginConfig:
			ls = obj.Labels
		default:
			return false
		}

		return utils.LabelContains(ls, reqLabels)
	}

	format := func(obj interface{}) interface{} {
		val := reflect.ValueOf(obj).Elem()
		l := val.FieldByName("Labels")
		if l.IsNil() {
			return nil
		}

		ls := l.Interface().(map[string]string)
		return subsetOf(reqLabels, ls)
	}

	var totalRet = store.NewListOutput()
	var existMap = make(map[string]struct{})
	for _, item := range items {
		ret, err := item.(store.Interface).List(c.Context(),
			store.ListInput{
				Predicate: predicate,
				Format:    format,
				// Sort it later.
				PageSize:   0,
				PageNumber: 0,
				Less: func(i, j interface{}) bool {
					return true
				},
			},
		)

		if err != nil {
			return nil, err
		}

		for _, r := range ret.Rows {
			if r == nil {
				continue
			}

			for k, v := range r.(map[string]string) {
				key := fmt.Sprintf("%s:%s", k, v)
				if _, exist := existMap[key]; exist {
					continue
				}

				existMap[key] = struct{}{}
				p := Pair{Key: k, Val: v}
				totalRet.Rows = append(totalRet.Rows, p)
			}
		}
	}
	totalRet.TotalSize = len(totalRet.Rows)

	sort.Slice(totalRet.Rows, func(i, j int) bool {
		p1 := totalRet.Rows[i].(Pair)
		p2 := totalRet.Rows[j].(Pair)

		if strings.Compare(p1.Key, p2.Key) == 0 {
			return strings.Compare(p1.Val, p2.Val) < 0
		}

		return strings.Compare(p1.Key, p2.Key) < 0
	})

	/* There are more than one store items,
	   So we need sort after getting all of labels.
	*/
	if input.PageSize > 0 && input.PageNumber > 0 {
		skipCount := (input.PageNumber - 1) * input.PageSize
		if skipCount > totalRet.TotalSize {
			totalRet.Rows = []interface{}{}
			return totalRet, nil
		}

		endIdx := skipCount + input.PageSize
		if endIdx >= totalRet.TotalSize {
			totalRet.Rows = totalRet.Rows[skipCount:]
			return totalRet, nil
		}

		totalRet.Rows = totalRet.Rows[skipCount:endIdx]
	}

	return totalRet, nil
}