feat: able to set group ratio now (close #62, close #142)

common/group-ratio.go

@@ -0,0 +1,30 @@
+package common
+
+import "encoding/json"
+
+var GroupRatio = map[string]float64{
+	"default": 1,
+	"vip":     1,
+	"svip":    1,
+}
+
+func GroupRatio2JSONString() string {
+	jsonBytes, err := json.Marshal(GroupRatio)
+	if err != nil {
+		SysError("Error marshalling model ratio: " + err.Error())
+	}
+	return string(jsonBytes)
+}
+
+func UpdateGroupRatioByJSONString(jsonStr string) error {
+	return json.Unmarshal([]byte(jsonStr), &GroupRatio)
+}
+
+func GetGroupRatio(name string) float64 {
+	ratio, ok := GroupRatio[name]
+	if !ok {
+		SysError("Group ratio not found: " + name)
+		return 1
+	}
+	return ratio
+}