refactor: alert rule name duplicate check

config/i18n.go

@@ -46,6 +46,7 @@ var (
 		"No such alert rule":                                         "告警规则不存在",
 		"No such alert rule group":                                   "告警规则分组不存在",
 		"No such alert event":                                        "告警事件不存在",
+		"Alert rule %s already exists":                               "告警规则(%s)已存在",
 		"No such collect rule":                                       "采集规则不存在",
 		"Decoded metric description empty":                           "导入的指标释义列表为空",
 		"User disabled":                                              "用户已被禁用",

http/router_alert_rule.go

@@ -89,6 +89,15 @@ func alertRulePut(c *gin.Context) {
 	arg := AlertRuleGroup(ar.GroupId)
 	alertRuleWritePermCheck(arg, me)
 
+	if ar.Name != f.Name {
+		num, err := models.AlertRuleCount("group_id=? and name=? and id<>?", ar.GroupId, f.Name, ar.Id)
+		dangerous(err)
+
+		if num > 0 {
+			bomb(200, "Alert rule %s already exists", f.Name)
+		}
+	}
+
 	ar.Name = f.Name
 	ar.Note = f.Note
 	ar.Type = f.Type

models/alert_rule.go

@@ -262,6 +262,15 @@ func (ar *AlertRule) Add() error {
 		return err
 	}
 
+	num, err := AlertRuleCount("group_id=? and name=?", ar.GroupId, ar.Name)
+	if err != nil {
+		return err
+	}
+
+	if num > 0 {
+		return _e("Alert rule %s already exists", ar.Name)
+	}
+
 	now := time.Now().Unix()
 	ar.CreateAt = now
 	ar.UpdateAt = now