fix node leave and join

liuxiaolong

2019-10-24 ca2652d724c91bcc0849c749d10f2b9af8129a09

 agent.go

@@ -240,12 +240,21 @@
      if event.EventType() == serf.EventMemberLeave {
         if ev.Members !=nil && len(ev.Members) ==1 {
            leaveMember := ev.Members[0]
            leaveSql := "delete from cluster_node where node_id='"+leaveMember.Name+"'"
            leaveSql := "update cluster_node set isDelete=1 where node_id='"+leaveMember.Name+"'"
            ExecuteSqlByGorm([]string{ leaveSql })

            logger.Info("EventMemberLeave,current Members:",ev.Members)
         }
         return
      } else if event.EventType() == serf.EventMemberJoin {
         if ev.Members !=nil && len(ev.Members) ==1 {
            leaveMember := ev.Members[0]
            leaveSql := "update cluster_node set isDelete=0 where node_id='"+leaveMember.Name+"'"
            ExecuteSqlByGorm([]string{ leaveSql })

            logger.Info("EventMemberJoin,current Members:",ev.Members)
         }
         return
      }