fix: add read/write locks for ModelRatio and GroupRatio to prevent concurrent map read/write issues (#2067)

relay/billing/ratio/group.go

@@ -3,8 +3,10 @@ package ratio
 import (
 	"encoding/json"
 	"github.com/songquanpeng/one-api/common/logger"
+	"sync"
 )
 
+var groupRatioLock sync.RWMutex
 var GroupRatio = map[string]float64{
 	"default": 1,
 	"vip":     1,
@@ -20,11 +22,15 @@ func GroupRatio2JSONString() string {
 }
 
 func UpdateGroupRatioByJSONString(jsonStr string) error {
+	groupRatioLock.Lock()
+	defer groupRatioLock.Unlock()
 	GroupRatio = make(map[string]float64)
 	return json.Unmarshal([]byte(jsonStr), &GroupRatio)
 }
 
 func GetGroupRatio(name string) float64 {
+	groupRatioLock.RLock()
+	defer groupRatioLock.RUnlock()
 	ratio, ok := GroupRatio[name]
 	if !ok {
 		logger.SysError("group ratio not found: " + name)