refactor resources API

Signed-off-by: hongming <talonwan@yunify.com>

pkg/server/params/params.go

@@ -30,22 +30,26 @@ const (
 	OrderByParam    = "orderBy"
 	ConditionsParam = "conditions"
 	ReverseParam    = "reverse"
-	NameParam       = "name"
+	defaultLimit    = 10
+	defaultOffset   = 0
 )
 
-func ParsePaging(paging string) (limit, offset int) {
-
-	limit = 10
-	offset = 0
+func ParsePaging(req *restful.Request) (limit, offset int) {
+	paging := req.QueryParameter(PagingParam)
 	if groups := regexp.MustCompile(`^limit=(-?\d+),page=(\d+)$`).FindStringSubmatch(paging); len(groups) == 3 {
 		limit, _ = strconv.Atoi(groups[1])
 		page, _ := strconv.Atoi(groups[2])
 		offset = (page - 1) * limit
+	} else {
+		limit = defaultLimit
+		offset = defaultOffset
 	}
 	return
 }
 
-func ParseConditions(conditionsStr string) (*Conditions, error) {
+func ParseConditions(req *restful.Request) (*Conditions, error) {
+
+	conditionsStr := req.QueryParameter(ConditionsParam)
 
 	conditions := &Conditions{Match: make(map[string]string, 0), Fuzzy: make(map[string]string, 0)}
 
@@ -76,16 +80,23 @@ func ParseConditions(conditionsStr string) (*Conditions, error) {
 	return conditions, nil
 }
 
-func ParseReverse(req *restful.Request) bool {
-	reverse := req.QueryParameter(ReverseParam)
-	b, err := strconv.ParseBool(reverse)
-	if err != nil {
-		return false
-	}
-	return b
-}
-
 type Conditions struct {
 	Match map[string]string
 	Fuzzy map[string]string
 }
+
+func GetBoolValueWithDefault(req *restful.Request, name string, dv bool) bool {
+	reverse := req.QueryParameter(name)
+	if v, err := strconv.ParseBool(reverse); err == nil {
+		return v
+	}
+	return dv
+}
+
+func GetStringValueWithDefault(req *restful.Request, name string, dv string) string {
+	v := req.QueryParameter(name)
+	if v == "" {
+		v = dv
+	}
+	return v
+}