Golang Conn.Create方法代码示例

func CreateProxyInfo(zkConn zkhelper.Conn, productName string, pi *ProxyInfo) (string, error) {
	data, err := json.Marshal(pi)
	if err != nil {
		return "", errors.Trace(err)
	}
	dir := GetProxyPath(productName)
	zkhelper.CreateRecursive(zkConn, dir, "", 0, zkhelper.DefaultDirACLs())
	return zkConn.Create(path.Join(dir, pi.Id), data, zk.FlagEphemeral, zkhelper.DefaultFileACLs())
}

func doResponseForTest(conn zkhelper.Conn, seq string, pi *ProxyInfo) error {
	actionPath := GetActionResponsePath(productName) + "/" + seq
	data, err := json.Marshal(pi)
	if err != nil {
		return errors.Trace(err)
	}

	_, err = conn.Create(path.Join(actionPath, pi.Id), data,
		0, zkhelper.DefaultFileACLs())
	return err
}

func CreateOrUpdate(zconn zkhelper.Conn, zkPath, value string, flags int, aclv []topo.ACL, recursive bool) (pathCreated string, err error) {
	if recursive {
		pathCreated, err = CreateRecursive(zconn, zkPath, value, flags, aclv)
	} else {
		pathCreated, err = zconn.Create(zkPath, []byte(value), int32(flags), aclv)
	}
	if err != nil && zkhelper.ZkErrorEqual(err, topo.ErrNodeExists) {
		pathCreated = ""
		_, err = zconn.Set(zkPath, []byte(value), -1)
	}
	return
}

// Create a path and any pieces required, think mkdir -p.
// Intermediate znodes are always created empty.
func CreateRecursive(zconn zkhelper.Conn, zkPath, value string, flags int, aclv []topo.ACL) (pathCreated string, err error) {
	parts := strings.Split(zkPath, "/")
	if parts[1] != zkhelper.MagicPrefix {
		return "", fmt.Errorf("zkutil: non /%v path: %v", zkhelper.MagicPrefix, zkPath)
	}

	pathCreated, err = zconn.Create(zkPath, []byte(value), int32(flags), aclv)

	if zkhelper.ZkErrorEqual(err, topo.ErrNoNode) {
		// Make sure that nodes are either "file" or "directory" to mirror file system
		// semantics.
		dirAclv := make([]topo.ACL, len(aclv))
		for i, acl := range aclv {
			dirAclv[i] = acl
			dirAclv[i].Perms = zkhelper.PERM_DIRECTORY
		}
		_, err = CreateRecursive(zconn, os_path.Dir(zkPath), "", 0, dirAclv)
		if err != nil && !zkhelper.ZkErrorEqual(err, topo.ErrNodeExists) {
			return "", err
		}
		pathCreated, err = zconn.Create(zkPath, []byte(value), int32(flags), aclv)
	}
	return
}

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
}