Golang Conn.Delete方法代碼示例

func (self *ServerGroup) RemoveServer(zkConn zkhelper.Conn, addr string) error {
	zkPath := fmt.Sprintf("/zk/codis/db_%s/servers/group_%d/%s", self.ProductName, self.Id, addr)
	data, _, err := zkConn.Get(zkPath)
	if err != nil {
		return errors.Trace(err)
	}

	var s Server
	err = json.Unmarshal(data, &s)
	if err != nil {
		return errors.Trace(err)
	}
	log.Info(s)
	if s.Type == SERVER_TYPE_MASTER {
		return errors.Errorf("cannot remove master, use promote first")
	}

	err = zkConn.Delete(zkPath, -1)
	if err != nil {
		return errors.Trace(err)
	}

	// update server list
	for i := 0; i < len(self.Servers); i++ {
		if self.Servers[i].Addr == s.Addr {
			self.Servers = append(self.Servers[:i], self.Servers[i+1:]...)
			break
		}
	}

	// remove slave won't need proxy confirm
	err = NewAction(zkConn, self.ProductName, ACTION_TYPE_SERVER_GROUP_CHANGED, self, "", false)
	return errors.Trace(err)
}

func ForceRemoveLock(zkConn zkhelper.Conn, productName string) error {
	lockPath := fmt.Sprintf("/zk/codis/db_%s/LOCK", productName)
	children, _, err := zkConn.Children(lockPath)
	if err != nil && !zkhelper.ZkErrorEqual(err, zk.ErrNoNode) {
		return errors.Trace(err)
	}

	for _, c := range children {
		fullPath := path.Join(lockPath, c)
		log.Info("deleting..", fullPath)
		err := zkConn.Delete(fullPath, 0)
		if err != nil {
			return errors.Trace(err)
		}
	}

	return nil
}

func NewActionWithTimeout(zkConn zkhelper.Conn, productName string, actionType ActionType, target interface{}, desc string, needConfirm bool, timeoutInMs int) error {
	ts := strconv.FormatInt(time.Now().Unix(), 10)

	action := &Action{
		Type:   actionType,
		Desc:   desc,
		Target: target,
		Ts:     ts,
	}

	// set action receivers
	proxies, err := ProxyList(zkConn, productName, func(p *ProxyInfo) bool {
		return p.State == PROXY_STATE_ONLINE
	})
	if err != nil {
		return errors.Trace(err)
	}
	if needConfirm {
		// do fencing here, make sure 'offline' proxies are really offline
		// now we only check whether the proxy lists are match
		fenceProxies, err := GetFenceProxyMap(zkConn, productName)
		if err != nil {
			return errors.Trace(err)
		}
		for _, proxy := range proxies {
			delete(fenceProxies, proxy.Addr)
		}
		if len(fenceProxies) > 0 {
			errMsg := bytes.NewBufferString("Some proxies may not stop cleanly:")
			for k, _ := range fenceProxies {
				errMsg.WriteString(" ")
				errMsg.WriteString(k)
			}
			return errors.Errorf("%s", errMsg)
		}
	}
	for _, p := range proxies {
		buf, err := json.Marshal(p)
		if err != nil {
			return errors.Trace(err)
		}
		action.Receivers = append(action.Receivers, string(buf))
	}

	b, _ := json.Marshal(action)

	prefix := GetWatchActionPath(productName)
	//action root path
	err = CreateActionRootPath(zkConn, prefix)
	if err != nil {
		return errors.Trace(err)
	}

	//response path
	respPath := path.Join(path.Dir(prefix), "ActionResponse")
	err = CreateActionRootPath(zkConn, respPath)
	if err != nil {
		return errors.Trace(err)
	}

	//create response node, etcd do not support create in order directory
	//get path first
	actionRespPath, err := zkConn.Create(respPath+"/", b, int32(zk.FlagSequence), zkhelper.DefaultFileACLs())
	if err != nil {
		log.ErrorErrorf(err, "zk create resp node = %s", respPath)
		return errors.Trace(err)
	}

	//remove file then create directory
	zkConn.Delete(actionRespPath, -1)
	actionRespPath, err = zkConn.Create(actionRespPath, b, 0, zkhelper.DefaultDirACLs())
	if err != nil {
		log.ErrorErrorf(err, "zk create resp node = %s", respPath)
		return errors.Trace(err)
	}

	suffix := path.Base(actionRespPath)

	// create action node
	actionPath := path.Join(prefix, suffix)
	_, err = zkConn.Create(actionPath, b, 0, zkhelper.DefaultFileACLs())
	if err != nil {
		log.ErrorErrorf(err, "zk create action path = %s", actionPath)
		return errors.Trace(err)
	}

	if needConfirm {
		if err := WaitForReceiverWithTimeout(zkConn, productName, actionRespPath, proxies, timeoutInMs); err != nil {
			return errors.Trace(err)
		}
	}
	return nil
}