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Feat: aria2 download and transfer in slave node (#1040)

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* Feat: retrieve nodes from data table

* Feat: master node ping slave node in REST API

* Feat: master send scheduled ping request

* Feat: inactive nodes recover loop

* Modify: remove database operations from aria2 RPC caller implementation

* Feat: init aria2 client in master node

* Feat: Round Robin load balancer

* Feat: create and monitor aria2 task in master node

* Feat: salve receive and handle heartbeat

* Fix: Node ID will be 0 in download record generated in older version

* Feat: sign request headers with all `X-` prefix

* Feat: API call to slave node will carry meta data in headers

* Feat: call slave aria2 rpc method from master

* Feat: get slave aria2 task status
Feat: encode slave response data using gob

* Feat: aria2 callback to master node / cancel or select task to slave node

* Fix: use dummy aria2 client when caller initialize failed in master node

* Feat: slave aria2 status event callback / salve RPC auth

* Feat: prototype for slave driven filesystem

* Feat: retry for init aria2 client in master node

* Feat: init request client with global options

* Feat: slave receive async task from master

* Fix: competition write in request header

* Refactor: dependency initialize order

* Feat: generic message queue implementation

* Feat: message queue implementation

* Feat: master waiting slave transfer result

* Feat: slave transfer file in stateless policy

* Feat: slave transfer file in slave policy

* Feat: slave transfer file in local policy

* Feat: slave transfer file in OneDrive policy

* Fix: failed to initialize update checker http client

* Feat: list slave nodes for dashboard

* Feat: test aria2 rpc connection in slave

* Feat: add and save node

* Feat: add and delete node in node pool

* Fix: temp file cannot be removed when aria2 task fails

* Fix: delete node in admin panel

* Feat: edit node and get node info

* Modify: delete unused settings
This commit is contained in:
AaronLiu
2021-10-31 09:41:56 +08:00
committed by GitHub
parent a3b4a22dbc
commit 056de22edb
74 changed files with 3647 additions and 715 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
pkg/cluster/errors.go Normal file
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package cluster
import "errors"
var (
ErrFeatureNotExist = errors.New("No nodes in nodepool match the feature specificed")
ErrIlegalPath = errors.New("path out of boundary of setting temp folder")
)

265
pkg/cluster/master.go Normal file
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package cluster
import (
"context"
"encoding/json"
model "github.com/cloudreve/Cloudreve/v3/models"
"github.com/cloudreve/Cloudreve/v3/pkg/aria2/common"
"github.com/cloudreve/Cloudreve/v3/pkg/aria2/rpc"
"github.com/cloudreve/Cloudreve/v3/pkg/auth"
"github.com/cloudreve/Cloudreve/v3/pkg/mq"
"github.com/cloudreve/Cloudreve/v3/pkg/serializer"
"github.com/cloudreve/Cloudreve/v3/pkg/util"
"github.com/gofrs/uuid"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
"sync"
"time"
)
const deleteTempFileDuration = 60 * time.Second
type MasterNode struct {
Model *model.Node
aria2RPC rpcService
lock sync.RWMutex
}
// RPCService 通过RPC服务的Aria2任务管理器
type rpcService struct {
Caller rpc.Client
Initialized bool
parent *MasterNode
options *clientOptions
}
type clientOptions struct {
Options map[string]interface{} // 创建下载时额外添加的设置
}
// Init 初始化节点
func (node *MasterNode) Init(nodeModel *model.Node) {
node.lock.Lock()
node.Model = nodeModel
node.aria2RPC.parent = node
node.lock.Unlock()
node.lock.RLock()
if node.Model.Aria2Enabled {
node.lock.RUnlock()
node.aria2RPC.Init()
return
}
node.lock.RUnlock()
}
func (node *MasterNode) ID() uint {
node.lock.RLock()
defer node.lock.RUnlock()
return node.Model.ID
}
func (node *MasterNode) Ping(req *serializer.NodePingReq) (*serializer.NodePingResp, error) {
return &serializer.NodePingResp{}, nil
}
// IsFeatureEnabled 查询节点的某项功能是否启用
func (node *MasterNode) IsFeatureEnabled(feature string) bool {
node.lock.RLock()
defer node.lock.RUnlock()
switch feature {
case "aria2":
return node.Model.Aria2Enabled
default:
return false
}
}
func (node *MasterNode) MasterAuthInstance() auth.Auth {
node.lock.RLock()
defer node.lock.RUnlock()
return auth.HMACAuth{SecretKey: []byte(node.Model.MasterKey)}
}
func (node *MasterNode) SlaveAuthInstance() auth.Auth {
node.lock.RLock()
defer node.lock.RUnlock()
return auth.HMACAuth{SecretKey: []byte(node.Model.SlaveKey)}
}
// SubscribeStatusChange 订阅节点状态更改
func (node *MasterNode) SubscribeStatusChange(callback func(isActive bool, id uint)) {
}
// IsActive 返回节点是否在线
func (node *MasterNode) IsActive() bool {
return true
}
// Kill 结束aria2请求
func (node *MasterNode) Kill() {
if node.aria2RPC.Caller != nil {
node.aria2RPC.Caller.Close()
}
}
// GetAria2Instance 获取主机Aria2实例
func (node *MasterNode) GetAria2Instance() common.Aria2 {
node.lock.RLock()
if !node.Model.Aria2Enabled {
node.lock.RUnlock()
return &common.DummyAria2{}
}
if !node.aria2RPC.Initialized {
node.lock.RUnlock()
node.aria2RPC.Init()
return &common.DummyAria2{}
}
defer node.lock.RUnlock()
return &node.aria2RPC
}
func (node *MasterNode) IsMater() bool {
return true
}
func (node *MasterNode) DBModel() *model.Node {
node.lock.RLock()
defer node.lock.RUnlock()
return node.Model
}
func (r *rpcService) Init() error {
r.parent.lock.Lock()
defer r.parent.lock.Unlock()
r.Initialized = false
// 客户端已存在，则关闭先前连接
if r.Caller != nil {
r.Caller.Close()
}
// 解析RPC服务地址
server, err := url.Parse(r.parent.Model.Aria2OptionsSerialized.Server)
if err != nil {
util.Log().Warning("无法解析主机 Aria2 RPC 服务地址，%s", err)
return err
}
server.Path = "/jsonrpc"
// 加载自定义下载配置
var globalOptions map[string]interface{}
if r.parent.Model.Aria2OptionsSerialized.Options != "" {
err = json.Unmarshal([]byte(r.parent.Model.Aria2OptionsSerialized.Options), &globalOptions)
if err != nil {
util.Log().Warning("无法解析主机 Aria2 配置，%s", err)
return err
}
}
r.options = &clientOptions{
Options: globalOptions,
}
timeout := r.parent.Model.Aria2OptionsSerialized.Timeout
caller, err := rpc.New(context.Background(), server.String(), r.parent.Model.Aria2OptionsSerialized.Token, time.Duration(timeout)*time.Second, mq.GlobalMQ)
r.Caller = caller
r.Initialized = err == nil
return err
}
func (r *rpcService) CreateTask(task *model.Download, groupOptions map[string]interface{}) (string, error) {
r.parent.lock.RLock()
// 生成存储路径
guid, _ := uuid.NewV4()
path := filepath.Join(
r.parent.Model.Aria2OptionsSerialized.TempPath,
"aria2",
guid.String(),
)
r.parent.lock.RUnlock()
// 创建下载任务
options := map[string]interface{}{
"dir": path,
}
for k, v := range r.options.Options {
options[k] = v
}
for k, v := range groupOptions {
options[k] = v
}
gid, err := r.Caller.AddURI(task.Source, options)
if err != nil || gid == "" {
return "", err
}
return gid, nil
}
func (r *rpcService) Status(task *model.Download) (rpc.StatusInfo, error) {
res, err := r.Caller.TellStatus(task.GID)
if err != nil {
// 失败后重试
util.Log().Debug("无法获取离线下载状态，%s，10秒钟后重试", err)
time.Sleep(time.Duration(10) * time.Second)
res, err = r.Caller.TellStatus(task.GID)
}
return res, err
}
func (r *rpcService) Cancel(task *model.Download) error {
// 取消下载任务
_, err := r.Caller.Remove(task.GID)
if err != nil {
util.Log().Warning("无法取消离线下载任务[%s], %s", task.GID, err)
}
return err
}
func (r *rpcService) Select(task *model.Download, files []int) error {
var selected = make([]string, len(files))
for i := 0; i < len(files); i++ {
selected[i] = strconv.Itoa(files[i])
}
_, err := r.Caller.ChangeOption(task.GID, map[string]interface{}{"select-file": strings.Join(selected, ",")})
return err
}
func (r *rpcService) GetConfig() model.Aria2Option {
r.parent.lock.RLock()
defer r.parent.lock.RUnlock()
return r.parent.Model.Aria2OptionsSerialized
}
func (s *rpcService) DeleteTempFile(task *model.Download) error {
s.parent.lock.RLock()
defer s.parent.lock.RUnlock()
// 避免被aria2占用，异步执行删除
go func(src string) {
time.Sleep(deleteTempFileDuration)
err := os.RemoveAll(src)
if err != nil {
util.Log().Warning("无法删除离线下载临时目录[%s], %s", src, err)
}
}(task.Parent)
return nil
}

60
pkg/cluster/node.go Normal file
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package cluster
import (
model "github.com/cloudreve/Cloudreve/v3/models"
"github.com/cloudreve/Cloudreve/v3/pkg/aria2/common"
"github.com/cloudreve/Cloudreve/v3/pkg/auth"
"github.com/cloudreve/Cloudreve/v3/pkg/serializer"
)
type Node interface {
// Init a node from database model
Init(node *model.Node)
// Check if given feature is enabled
IsFeatureEnabled(feature string) bool
// Subscribe node status change to a callback function
SubscribeStatusChange(callback func(isActive bool, id uint))
// Ping the node
Ping(req *serializer.NodePingReq) (*serializer.NodePingResp, error)
// Returns if the node is active
IsActive() bool
// Get instances for aria2 calls
GetAria2Instance() common.Aria2
// Returns unique id of this node
ID() uint
// Kill node and recycle resources
Kill()
// Returns if current node is master node
IsMater() bool
// Get auth instance used to check RPC call from slave to master
MasterAuthInstance() auth.Auth
// Get auth instance used to check RPC call from master to slave
SlaveAuthInstance() auth.Auth
// Get node DB model
DBModel() *model.Node
}
// Create new node from DB model
func NewNodeFromDBModel(node *model.Node) Node {
switch node.Type {
case model.SlaveNodeType:
slave := &SlaveNode{}
slave.Init(node)
return slave
default:
master := &MasterNode{}
master.Init(node)
return master
}
}

176
pkg/cluster/pool.go Normal file
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package cluster
import (
model "github.com/cloudreve/Cloudreve/v3/models"
"github.com/cloudreve/Cloudreve/v3/pkg/balancer"
"github.com/cloudreve/Cloudreve/v3/pkg/util"
"sync"
)
var Default *NodePool
// 需要分类的节点组
var featureGroup = []string{"aria2"}
// Pool 节点池
type Pool interface {
// Returns active node selected by given feature and load balancer
BalanceNodeByFeature(feature string, lb balancer.Balancer) (error, Node)
// Returns node by ID
GetNodeByID(id uint) Node
// Add given node into pool. If node existed, refresh node.
Add(node *model.Node)
// Delete and kill node from pool by given node id
Delete(id uint)
}
// NodePool 通用节点池
type NodePool struct {
active map[uint]Node
inactive map[uint]Node
featureMap map[string][]Node
lock sync.RWMutex
}
// Init 初始化从机节点池
func Init() {
Default = &NodePool{
featureMap: make(map[string][]Node),
}
if err := Default.initFromDB(); err != nil {
util.Log().Warning("节点池初始化失败, %s", err)
}
}
func (pool *NodePool) buildIndexMap() {
pool.lock.Lock()
for _, feature := range featureGroup {
pool.featureMap[feature] = make([]Node, 0)
}
for _, v := range pool.active {
for _, feature := range featureGroup {
if v.IsFeatureEnabled(feature) {
pool.featureMap[feature] = append(pool.featureMap[feature], v)
}
}
}
pool.lock.Unlock()
}
func (pool *NodePool) GetNodeByID(id uint) Node {
pool.lock.RLock()
defer pool.lock.RUnlock()
if node, ok := pool.active[id]; ok {
return node
}
return pool.inactive[id]
}
func (pool *NodePool) nodeStatusChange(isActive bool, id uint) {
util.Log().Debug("从机节点 [ID=%d] 状态变更 [Active=%t]", id, isActive)
pool.lock.Lock()
if isActive {
node := pool.inactive[id]
delete(pool.inactive, id)
pool.active[id] = node
} else {
node := pool.active[id]
delete(pool.active, id)
pool.inactive[id] = node
}
pool.lock.Unlock()
pool.buildIndexMap()
}
func (pool *NodePool) initFromDB() error {
nodes, err := model.GetNodesByStatus(model.NodeActive)
if err != nil {
return err
}
pool.lock.Lock()
pool.active = make(map[uint]Node)
pool.inactive = make(map[uint]Node)
for i := 0; i < len(nodes); i++ {
pool.add(&nodes[i])
}
pool.lock.Unlock()
pool.buildIndexMap()
return nil
}
func (pool *NodePool) add(node *model.Node) {
newNode := NewNodeFromDBModel(node)
if newNode.IsActive() {
pool.active[node.ID] = newNode
} else {
pool.inactive[node.ID] = newNode
}
// 订阅节点状态变更
newNode.SubscribeStatusChange(func(isActive bool, id uint) {
pool.nodeStatusChange(isActive, id)
})
}
func (pool *NodePool) Add(node *model.Node) {
pool.lock.Lock()
defer pool.buildIndexMap()
defer pool.lock.Unlock()
if _, ok := pool.active[node.ID]; ok {
// TODO: refresh node
return
}
if _, ok := pool.inactive[node.ID]; ok {
return
}
pool.add(node)
}
func (pool *NodePool) Delete(id uint) {
pool.lock.Lock()
defer pool.buildIndexMap()
defer pool.lock.Unlock()
if node, ok := pool.active[id]; ok {
node.Kill()
delete(pool.active, id)
return
}
if node, ok := pool.inactive[id]; ok {
node.Kill()
delete(pool.inactive, id)
return
}
}
// BalanceNodeByFeature 根据 feature 和 LoadBalancer 取出节点
func (pool *NodePool) BalanceNodeByFeature(feature string, lb balancer.Balancer) (error, Node) {
pool.lock.RLock()
defer pool.lock.RUnlock()
if nodes, ok := pool.featureMap[feature]; ok {
err, res := lb.NextPeer(nodes)
if err == nil {
return nil, res.(Node)
}
return err, nil
}
return ErrFeatureNotExist, nil
}

405
pkg/cluster/slave.go Normal file
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package cluster
import (
"encoding/json"
model "github.com/cloudreve/Cloudreve/v3/models"
"github.com/cloudreve/Cloudreve/v3/pkg/aria2/common"
"github.com/cloudreve/Cloudreve/v3/pkg/aria2/rpc"
"github.com/cloudreve/Cloudreve/v3/pkg/auth"
"github.com/cloudreve/Cloudreve/v3/pkg/request"
"github.com/cloudreve/Cloudreve/v3/pkg/serializer"
"github.com/cloudreve/Cloudreve/v3/pkg/util"
"io"
"net/url"
"strings"
"sync"
"time"
)
type SlaveNode struct {
Model *model.Node
Active bool
caller slaveCaller
callback func(bool, uint)
close chan bool
lock sync.RWMutex
}
type slaveCaller struct {
parent *SlaveNode
Client request.Client
}
// Init 初始化节点
func (node *SlaveNode) Init(nodeModel *model.Node) {
node.lock.Lock()
defer node.lock.Unlock()
node.Model = nodeModel
// Init http request client
var endpoint *url.URL
if serverURL, err := url.Parse(node.Model.Server); err == nil {
var controller *url.URL
controller, _ = url.Parse("/api/v3/slave")
endpoint = serverURL.ResolveReference(controller)
}
signTTL := model.GetIntSetting("slave_api_timeout", 60)
node.caller.Client = request.NewClient(
request.WithMasterMeta(),
request.WithTimeout(time.Duration(signTTL)*time.Second),
request.WithCredential(auth.HMACAuth{SecretKey: []byte(nodeModel.SlaveKey)}, int64(signTTL)),
request.WithEndpoint(endpoint.String()),
)
node.caller.parent = node
node.Active = true
if node.close != nil {
node.close <- true
}
go node.StartPingLoop()
}
// IsFeatureEnabled 查询节点的某项功能是否启用
func (node *SlaveNode) IsFeatureEnabled(feature string) bool {
node.lock.RLock()
defer node.lock.RUnlock()
switch feature {
case "aria2":
return node.Model.Aria2Enabled
default:
return false
}
}
// SubscribeStatusChange 订阅节点状态更改
func (node *SlaveNode) SubscribeStatusChange(callback func(bool, uint)) {
node.lock.Lock()
node.callback = callback
node.lock.Unlock()
}
// Ping 从机节点，返回从机负载
func (node *SlaveNode) Ping(req *serializer.NodePingReq) (*serializer.NodePingResp, error) {
reqBodyEncoded, err := json.Marshal(req)
if err != nil {
return nil, err
}
bodyReader := strings.NewReader(string(reqBodyEncoded))
resp, err := node.caller.Client.Request(
"POST",
"heartbeat",
bodyReader,
).CheckHTTPResponse(200).DecodeResponse()
if err != nil {
return nil, err
}
// 处理列取结果
if resp.Code != 0 {
return nil, serializer.NewErrorFromResponse(resp)
}
var res serializer.NodePingResp
if resStr, ok := resp.Data.(string); ok {
err = json.Unmarshal([]byte(resStr), &res)
if err != nil {
return nil, err
}
}
return &res, nil
}
// IsActive 返回节点是否在线
func (node *SlaveNode) IsActive() bool {
node.lock.RLock()
defer node.lock.RUnlock()
return node.Active
}
// Kill 结束节点内相关循环
func (node *SlaveNode) Kill() {
node.lock.RLock()
defer node.lock.RUnlock()
if node.close != nil {
close(node.close)
}
}
// GetAria2Instance 获取从机Aria2实例
func (node *SlaveNode) GetAria2Instance() common.Aria2 {
node.lock.RLock()
defer node.lock.RUnlock()
if !node.Model.Aria2Enabled {
return &common.DummyAria2{}
}
return &node.caller
}
func (node *SlaveNode) ID() uint {
node.lock.RLock()
defer node.lock.RUnlock()
return node.Model.ID
}
func (node *SlaveNode) StartPingLoop() {
node.lock.Lock()
node.close = make(chan bool)
node.lock.Unlock()
tickDuration := time.Duration(model.GetIntSetting("slave_ping_interval", 300)) * time.Second
recoverDuration := time.Duration(model.GetIntSetting("slave_recover_interval", 600)) * time.Second
pingTicker := time.Duration(0)
util.Log().Debug("从机节点 [%s] 启动心跳循环", node.Model.Name)
retry := 0
recoverMode := false
isFirstLoop := true
loop:
for {
select {
case <-time.After(pingTicker):
if pingTicker == 0 {
pingTicker = tickDuration
}
util.Log().Debug("从机节点 [%s] 发送Ping", node.Model.Name)
res, err := node.Ping(node.getHeartbeatContent(isFirstLoop))
isFirstLoop = false
if err != nil {
util.Log().Debug("Ping从机节点 [%s] 时发生错误: %s", node.Model.Name, err)
retry++
if retry >= model.GetIntSetting("slave_node_retry", 3) {
util.Log().Debug("从机节点 [%s] Ping 重试已达到最大限制，将从机节点标记为不可用", node.Model.Name)
node.changeStatus(false)
if !recoverMode {
// 启动恢复监控循环
util.Log().Debug("从机节点 [%s] 进入恢复模式", node.Model.Name)
pingTicker = recoverDuration
recoverMode = true
}
}
} else {
if recoverMode {
util.Log().Debug("从机节点 [%s] 复活", node.Model.Name)
pingTicker = tickDuration
recoverMode = false
isFirstLoop = true
}
util.Log().Debug("从机节点 [%s] 状态: %s", node.Model.Name, res)
node.changeStatus(true)
retry = 0
}
case <-node.close:
util.Log().Debug("从机节点 [%s] 收到关闭信号", node.Model.Name)
break loop
}
}
}
func (node *SlaveNode) IsMater() bool {
return false
}
func (node *SlaveNode) MasterAuthInstance() auth.Auth {
node.lock.RLock()
defer node.lock.RUnlock()
return auth.HMACAuth{SecretKey: []byte(node.Model.MasterKey)}
}
func (node *SlaveNode) SlaveAuthInstance() auth.Auth {
node.lock.RLock()
defer node.lock.RUnlock()
return auth.HMACAuth{SecretKey: []byte(node.Model.SlaveKey)}
}
func (node *SlaveNode) DBModel() *model.Node {
node.lock.RLock()
defer node.lock.RUnlock()
return node.Model
}
// getHeartbeatContent gets serializer.NodePingReq used to send heartbeat to slave
func (node *SlaveNode) getHeartbeatContent(isUpdate bool) *serializer.NodePingReq {
return &serializer.NodePingReq{
SiteURL: model.GetSiteURL().String(),
IsUpdate: isUpdate,
SiteID: model.GetSettingByName("siteID"),
Node: node.Model,
CredentialTTL: model.GetIntSetting("slave_api_timeout", 60),
}
}
func (node *SlaveNode) changeStatus(isActive bool) {
node.lock.RLock()
id := node.Model.ID
if isActive != node.Active {
node.lock.RUnlock()
node.lock.Lock()
node.Active = isActive
node.lock.Unlock()
node.callback(isActive, id)
} else {
node.lock.RUnlock()
}
}
func (s *slaveCaller) Init() error {
return nil
}
// SendAria2Call send remote aria2 call to slave node
func (s *slaveCaller) SendAria2Call(body *serializer.SlaveAria2Call, scope string) (*serializer.Response, error) {
reqReader, err := getAria2RequestBody(body)
if err != nil {
return nil, err
}
return s.Client.Request(
"POST",
"aria2/"+scope,
reqReader,
).CheckHTTPResponse(200).DecodeResponse()
}
func (s *slaveCaller) CreateTask(task *model.Download, options map[string]interface{}) (string, error) {
s.parent.lock.RLock()
defer s.parent.lock.RUnlock()
req := &serializer.SlaveAria2Call{
Task: task,
GroupOptions: options,
}
res, err := s.SendAria2Call(req, "task")
if err != nil {
return "", err
}
if res.Code != 0 {
return "", serializer.NewErrorFromResponse(res)
}
return res.Data.(string), err
}
func (s *slaveCaller) Status(task *model.Download) (rpc.StatusInfo, error) {
s.parent.lock.RLock()
defer s.parent.lock.RUnlock()
req := &serializer.SlaveAria2Call{
Task: task,
}
res, err := s.SendAria2Call(req, "status")
if err != nil {
return rpc.StatusInfo{}, err
}
if res.Code != 0 {
return rpc.StatusInfo{}, serializer.NewErrorFromResponse(res)
}
var status rpc.StatusInfo
res.GobDecode(&status)
return status, err
}
func (s *slaveCaller) Cancel(task *model.Download) error {
s.parent.lock.RLock()
defer s.parent.lock.RUnlock()
req := &serializer.SlaveAria2Call{
Task: task,
}
res, err := s.SendAria2Call(req, "cancel")
if err != nil {
return err
}
if res.Code != 0 {
return serializer.NewErrorFromResponse(res)
}
return nil
}
func (s *slaveCaller) Select(task *model.Download, files []int) error {
s.parent.lock.RLock()
defer s.parent.lock.RUnlock()
req := &serializer.SlaveAria2Call{
Task: task,
Files: files,
}
res, err := s.SendAria2Call(req, "select")
if err != nil {
return err
}
if res.Code != 0 {
return serializer.NewErrorFromResponse(res)
}
return nil
}
func (s *slaveCaller) GetConfig() model.Aria2Option {
s.parent.lock.RLock()
defer s.parent.lock.RUnlock()
return s.parent.Model.Aria2OptionsSerialized
}
func (s *slaveCaller) DeleteTempFile(task *model.Download) error {
s.parent.lock.RLock()
defer s.parent.lock.RUnlock()
req := &serializer.SlaveAria2Call{
Task: task,
}
res, err := s.SendAria2Call(req, "delete")
if err != nil {
return err
}
if res.Code != 0 {
return serializer.NewErrorFromResponse(res)
}
return nil
}
func getAria2RequestBody(body *serializer.SlaveAria2Call) (io.Reader, error) {
reqBodyEncoded, err := json.Marshal(body)
if err != nil {
return nil, err
}
return strings.NewReader(string(reqBodyEncoded)), nil
}