chore: reorganize helper related package

relay/billing/group-ratio.go

@@ -0,0 +1,34 @@
+package billing
+
+import (
+	"encoding/json"
+	"github.com/songquanpeng/one-api/common/logger"
+)
+
+var GroupRatio = map[string]float64{
+	"default": 1,
+	"vip":     1,
+	"svip":    1,
+}
+
+func GroupRatio2JSONString() string {
+	jsonBytes, err := json.Marshal(GroupRatio)
+	if err != nil {
+		logger.SysError("error marshalling model ratio: " + err.Error())
+	}
+	return string(jsonBytes)
+}
+
+func UpdateGroupRatioByJSONString(jsonStr string) error {
+	GroupRatio = make(map[string]float64)
+	return json.Unmarshal([]byte(jsonStr), &GroupRatio)
+}
+
+func GetGroupRatio(name string) float64 {
+	ratio, ok := GroupRatio[name]
+	if !ok {
+		logger.SysError("group ratio not found: " + name)
+		return 1
+	}
+	return ratio
+}