680 lines
20 KiB
Go
680 lines
20 KiB
Go
package agent
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import (
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"fmt"
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"io"
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"log"
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"net"
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"path/filepath"
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"runtime"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/hashicorp/nomad/client"
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clientconfig "github.com/hashicorp/nomad/client/config"
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"github.com/hashicorp/nomad/command/agent/consul"
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"github.com/hashicorp/nomad/nomad"
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"github.com/hashicorp/nomad/nomad/structs"
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)
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const (
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clientHttpCheckInterval = 10 * time.Second
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clientHttpCheckTimeout = 3 * time.Second
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serverHttpCheckInterval = 10 * time.Second
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serverHttpCheckTimeout = 3 * time.Second
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serverRpcCheckInterval = 10 * time.Second
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serverRpcCheckTimeout = 3 * time.Second
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serverSerfCheckInterval = 10 * time.Second
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serverSerfCheckTimeout = 3 * time.Second
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)
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// Agent is a long running daemon that is used to run both
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// clients and servers. Servers are responsible for managing
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// state and making scheduling decisions. Clients can be
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// scheduled to, and are responsible for interfacing with
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// servers to run allocations.
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type Agent struct {
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config *Config
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logger *log.Logger
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logOutput io.Writer
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// consulSyncer registers the Nomad agent with the Consul Agent
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consulSyncer *consul.Syncer
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client *client.Client
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clientHTTPAddr string
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server *nomad.Server
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serverHTTPAddr string
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serverRPCAddr string
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serverSerfAddr string
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shutdown bool
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shutdownCh chan struct{}
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shutdownLock sync.Mutex
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}
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// NewAgent is used to create a new agent with the given configuration
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func NewAgent(config *Config, logOutput io.Writer) (*Agent, error) {
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a := &Agent{
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config: config,
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logger: log.New(logOutput, "", log.LstdFlags|log.Lmicroseconds),
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logOutput: logOutput,
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shutdownCh: make(chan struct{}),
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}
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if err := a.setupConsulSyncer(); err != nil {
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return nil, fmt.Errorf("Failed to initialize Consul syncer task: %v", err)
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}
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if err := a.setupServer(); err != nil {
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return nil, err
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}
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if err := a.setupClient(); err != nil {
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return nil, err
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}
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if a.client == nil && a.server == nil {
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return nil, fmt.Errorf("must have at least client or server mode enabled")
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}
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// The Nomad Agent runs the consul.Syncer regardless of whether or not the
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// Agent is running in Client or Server mode (or both), and regardless of
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// the consul.auto_advertise parameter. The Client and Server both reuse the
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// same consul.Syncer instance. This Syncer task periodically executes
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// callbacks that update Consul. The reason the Syncer is always running is
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// because one of the callbacks is attempts to self-bootstrap Nomad using
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// information found in Consul.
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go a.consulSyncer.Run()
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return a, nil
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}
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// serverConfig is used to generate a new server configuration struct
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// for initializing a nomad server.
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func (a *Agent) serverConfig() (*nomad.Config, error) {
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conf := a.config.NomadConfig
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if conf == nil {
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conf = nomad.DefaultConfig()
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}
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conf.LogOutput = a.logOutput
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conf.DevMode = a.config.DevMode
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conf.Build = fmt.Sprintf("%s%s", a.config.Version, a.config.VersionPrerelease)
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if a.config.Region != "" {
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conf.Region = a.config.Region
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}
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if a.config.Datacenter != "" {
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conf.Datacenter = a.config.Datacenter
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}
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if a.config.NodeName != "" {
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conf.NodeName = a.config.NodeName
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}
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if a.config.Server.BootstrapExpect > 0 {
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if a.config.Server.BootstrapExpect == 1 {
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conf.Bootstrap = true
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} else {
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atomic.StoreInt32(&conf.BootstrapExpect, int32(a.config.Server.BootstrapExpect))
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}
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}
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if a.config.DataDir != "" {
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conf.DataDir = filepath.Join(a.config.DataDir, "server")
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}
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if a.config.Server.DataDir != "" {
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conf.DataDir = a.config.Server.DataDir
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}
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if a.config.Server.ProtocolVersion != 0 {
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conf.ProtocolVersion = uint8(a.config.Server.ProtocolVersion)
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}
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if a.config.Server.NumSchedulers != 0 {
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conf.NumSchedulers = a.config.Server.NumSchedulers
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}
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if len(a.config.Server.EnabledSchedulers) != 0 {
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conf.EnabledSchedulers = a.config.Server.EnabledSchedulers
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}
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// Set up the advertise addrs
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if addr := a.config.AdvertiseAddrs.Serf; addr != "" {
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serfAddr, err := net.ResolveTCPAddr("tcp", addr)
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if err != nil {
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return nil, fmt.Errorf("error resolving serf advertise address: %s", err)
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}
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conf.SerfConfig.MemberlistConfig.AdvertiseAddr = serfAddr.IP.String()
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conf.SerfConfig.MemberlistConfig.AdvertisePort = serfAddr.Port
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}
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if addr := a.config.AdvertiseAddrs.RPC; addr != "" {
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rpcAddr, err := net.ResolveTCPAddr("tcp", addr)
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if err != nil {
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return nil, fmt.Errorf("error resolving rpc advertise address: %s", err)
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}
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conf.RPCAdvertise = rpcAddr
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}
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// Set up the bind addresses
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if addr := a.config.BindAddr; addr != "" {
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conf.RPCAddr.IP = net.ParseIP(addr)
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conf.SerfConfig.MemberlistConfig.BindAddr = addr
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}
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if addr := a.config.Addresses.RPC; addr != "" {
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conf.RPCAddr.IP = net.ParseIP(addr)
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}
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if addr := a.config.Addresses.Serf; addr != "" {
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conf.SerfConfig.MemberlistConfig.BindAddr = addr
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}
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// Set up the ports
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if port := a.config.Ports.RPC; port != 0 {
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conf.RPCAddr.Port = port
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}
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if port := a.config.Ports.Serf; port != 0 {
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conf.SerfConfig.MemberlistConfig.BindPort = port
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}
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// Resolve the Server's HTTP Address
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if a.config.AdvertiseAddrs.HTTP != "" {
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a.serverHTTPAddr = a.config.AdvertiseAddrs.HTTP
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} else if a.config.Addresses.HTTP != "" {
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a.serverHTTPAddr = net.JoinHostPort(a.config.Addresses.HTTP, strconv.Itoa(a.config.Ports.HTTP))
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} else if a.config.BindAddr != "" {
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a.serverHTTPAddr = net.JoinHostPort(a.config.BindAddr, strconv.Itoa(a.config.Ports.HTTP))
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} else {
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a.serverHTTPAddr = net.JoinHostPort("127.0.0.1", strconv.Itoa(a.config.Ports.HTTP))
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}
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addr, err := net.ResolveTCPAddr("tcp", a.serverHTTPAddr)
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if err != nil {
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return nil, fmt.Errorf("error resolving HTTP addr %+q: %v", a.serverHTTPAddr, err)
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}
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a.serverHTTPAddr = net.JoinHostPort(addr.IP.String(), strconv.Itoa(addr.Port))
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// Resolve the Server's RPC Address
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if a.config.AdvertiseAddrs.RPC != "" {
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a.serverRPCAddr = a.config.AdvertiseAddrs.RPC
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} else if a.config.Addresses.RPC != "" {
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a.serverRPCAddr = net.JoinHostPort(a.config.Addresses.RPC, strconv.Itoa(a.config.Ports.RPC))
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} else if a.config.BindAddr != "" {
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a.serverRPCAddr = net.JoinHostPort(a.config.BindAddr, strconv.Itoa(a.config.Ports.RPC))
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} else {
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a.serverRPCAddr = net.JoinHostPort("127.0.0.1", strconv.Itoa(a.config.Ports.RPC))
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}
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addr, err = net.ResolveTCPAddr("tcp", a.serverRPCAddr)
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if err != nil {
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return nil, fmt.Errorf("error resolving RPC addr %+q: %v", a.serverRPCAddr, err)
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}
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a.serverRPCAddr = net.JoinHostPort(addr.IP.String(), strconv.Itoa(addr.Port))
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// Resolve the Server's Serf Address
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if a.config.AdvertiseAddrs.Serf != "" {
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a.serverSerfAddr = a.config.AdvertiseAddrs.Serf
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} else if a.config.Addresses.Serf != "" {
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a.serverSerfAddr = net.JoinHostPort(a.config.Addresses.Serf, strconv.Itoa(a.config.Ports.Serf))
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} else if a.config.BindAddr != "" {
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a.serverSerfAddr = net.JoinHostPort(a.config.BindAddr, strconv.Itoa(a.config.Ports.Serf))
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} else {
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a.serverSerfAddr = net.JoinHostPort("127.0.0.1", strconv.Itoa(a.config.Ports.Serf))
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}
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addr, err = net.ResolveTCPAddr("tcp", a.serverSerfAddr)
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if err != nil {
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return nil, fmt.Errorf("error resolving Serf addr %+q: %v", a.serverSerfAddr, err)
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}
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a.serverSerfAddr = net.JoinHostPort(addr.IP.String(), strconv.Itoa(addr.Port))
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if gcThreshold := a.config.Server.NodeGCThreshold; gcThreshold != "" {
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dur, err := time.ParseDuration(gcThreshold)
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if err != nil {
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return nil, err
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}
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conf.NodeGCThreshold = dur
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}
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if heartbeatGrace := a.config.Server.HeartbeatGrace; heartbeatGrace != "" {
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dur, err := time.ParseDuration(heartbeatGrace)
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if err != nil {
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return nil, err
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}
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conf.HeartbeatGrace = dur
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}
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if a.config.Consul.AutoAdvertise && a.config.Consul.ServerServiceName == "" {
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return nil, fmt.Errorf("server_service_name must be set when auto_advertise is enabled")
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}
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conf.ConsulConfig = a.config.Consul
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return conf, nil
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}
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// clientConfig is used to generate a new client configuration struct
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// for initializing a Nomad client.
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func (a *Agent) clientConfig() (*clientconfig.Config, error) {
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// Setup the configuration
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conf := a.config.ClientConfig
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if conf == nil {
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conf = clientconfig.DefaultConfig()
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}
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if a.server != nil {
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conf.RPCHandler = a.server
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}
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conf.LogOutput = a.logOutput
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conf.DevMode = a.config.DevMode
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if a.config.Region != "" {
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conf.Region = a.config.Region
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}
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if a.config.DataDir != "" {
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conf.StateDir = filepath.Join(a.config.DataDir, "client")
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conf.AllocDir = filepath.Join(a.config.DataDir, "alloc")
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}
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if a.config.Client.StateDir != "" {
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conf.StateDir = a.config.Client.StateDir
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}
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if a.config.Client.AllocDir != "" {
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conf.AllocDir = a.config.Client.AllocDir
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}
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conf.Servers = a.config.Client.Servers
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if a.config.Client.NetworkInterface != "" {
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conf.NetworkInterface = a.config.Client.NetworkInterface
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}
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conf.ChrootEnv = a.config.Client.ChrootEnv
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conf.Options = a.config.Client.Options
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// Logging deprecation messages about consul related configuration in client
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// options
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var invalidConsulKeys []string
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for key := range conf.Options {
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if strings.HasPrefix(key, "consul") {
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invalidConsulKeys = append(invalidConsulKeys, fmt.Sprintf("options.%s", key))
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}
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}
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if len(invalidConsulKeys) > 0 {
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a.logger.Printf("[WARN] agent: Invalid keys: %v", strings.Join(invalidConsulKeys, ","))
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a.logger.Printf(`Nomad client ignores consul related configuration in client options.
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Please refer to the guide https://www.nomadproject.io/docs/agent/config.html#consul_options
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to configure Nomad to work with Consul.`)
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}
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if a.config.Client.NetworkSpeed != 0 {
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conf.NetworkSpeed = a.config.Client.NetworkSpeed
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}
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if a.config.Client.MaxKillTimeout != "" {
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dur, err := time.ParseDuration(a.config.Client.MaxKillTimeout)
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if err != nil {
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return nil, fmt.Errorf("Error parsing retry interval: %s", err)
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}
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conf.MaxKillTimeout = dur
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}
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conf.ClientMaxPort = uint(a.config.Client.ClientMaxPort)
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conf.ClientMinPort = uint(a.config.Client.ClientMinPort)
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// Setup the node
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conf.Node = new(structs.Node)
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conf.Node.Datacenter = a.config.Datacenter
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conf.Node.Name = a.config.NodeName
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conf.Node.Meta = a.config.Client.Meta
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conf.Node.NodeClass = a.config.Client.NodeClass
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// Resolve the Client's HTTP address
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if a.config.AdvertiseAddrs.HTTP != "" {
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a.clientHTTPAddr = a.config.AdvertiseAddrs.HTTP
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} else if a.config.Addresses.HTTP != "" {
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a.clientHTTPAddr = net.JoinHostPort(a.config.Addresses.HTTP, strconv.Itoa(a.config.Ports.HTTP))
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} else if a.config.BindAddr != "" {
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a.clientHTTPAddr = net.JoinHostPort(a.config.BindAddr, strconv.Itoa(a.config.Ports.HTTP))
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} else {
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a.clientHTTPAddr = net.JoinHostPort("127.0.0.1", strconv.Itoa(a.config.Ports.HTTP))
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}
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addr, err := net.ResolveTCPAddr("tcp", a.clientHTTPAddr)
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if err != nil {
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return nil, fmt.Errorf("error resolving HTTP addr %+q: %v", a.clientHTTPAddr, err)
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}
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httpAddr := net.JoinHostPort(addr.IP.String(), strconv.Itoa(addr.Port))
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conf.Node.HTTPAddr = httpAddr
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a.clientHTTPAddr = httpAddr
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// Reserve resources on the node.
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r := conf.Node.Reserved
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if r == nil {
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r = new(structs.Resources)
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conf.Node.Reserved = r
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}
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r.CPU = a.config.Client.Reserved.CPU
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r.MemoryMB = a.config.Client.Reserved.MemoryMB
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r.DiskMB = a.config.Client.Reserved.DiskMB
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r.IOPS = a.config.Client.Reserved.IOPS
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conf.GloballyReservedPorts = a.config.Client.Reserved.ParsedReservedPorts
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conf.Version = fmt.Sprintf("%s%s", a.config.Version, a.config.VersionPrerelease)
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conf.Revision = a.config.Revision
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if a.config.Consul.AutoAdvertise && a.config.Consul.ClientServiceName == "" {
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return nil, fmt.Errorf("client_service_name must be set when auto_advertise is enabled")
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}
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conf.ConsulConfig = a.config.Consul
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conf.StatsCollectionInterval = a.config.Telemetry.collectionInterval
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conf.PublishNodeMetrics = a.config.Telemetry.PublishNodeMetrics
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conf.PublishAllocationMetrics = a.config.Telemetry.PublishAllocationMetrics
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return conf, nil
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}
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// setupServer is used to setup the server if enabled
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func (a *Agent) setupServer() error {
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if !a.config.Server.Enabled {
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return nil
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}
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// Setup the configuration
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conf, err := a.serverConfig()
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if err != nil {
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return fmt.Errorf("server config setup failed: %s", err)
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}
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// Create the server
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server, err := nomad.NewServer(conf, a.consulSyncer, a.logger)
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if err != nil {
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return fmt.Errorf("server setup failed: %v", err)
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}
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a.server = server
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// Create the Nomad Server services for Consul
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if a.config.Consul.AutoAdvertise {
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httpServ := &structs.Service{
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Name: a.config.Consul.ServerServiceName,
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PortLabel: a.serverHTTPAddr,
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Tags: []string{consul.ServiceTagHTTP},
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Checks: []*structs.ServiceCheck{
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&structs.ServiceCheck{
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Name: "Nomad Server HTTP Check",
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Type: "http",
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Path: "/v1/status/peers",
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Protocol: "http", // TODO TLS
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Interval: serverHttpCheckInterval,
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Timeout: serverHttpCheckTimeout,
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},
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},
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}
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rpcServ := &structs.Service{
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Name: a.config.Consul.ServerServiceName,
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PortLabel: a.serverRPCAddr,
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Tags: []string{consul.ServiceTagRPC},
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Checks: []*structs.ServiceCheck{
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&structs.ServiceCheck{
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Name: "Nomad Server RPC Check",
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Type: "tcp",
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Interval: serverRpcCheckInterval,
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Timeout: serverRpcCheckTimeout,
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},
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},
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}
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serfServ := &structs.Service{
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PortLabel: a.serverSerfAddr,
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Name: a.config.Consul.ServerServiceName,
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Tags: []string{consul.ServiceTagSerf},
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Checks: []*structs.ServiceCheck{
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&structs.ServiceCheck{
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Name: "Nomad Server Serf Check",
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Type: "tcp",
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Interval: serverSerfCheckInterval,
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Timeout: serverSerfCheckTimeout,
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},
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},
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}
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a.consulSyncer.SetServices(consul.ServerDomain, map[consul.ServiceKey]*structs.Service{
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consul.GenerateServiceKey(httpServ): httpServ,
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consul.GenerateServiceKey(rpcServ): rpcServ,
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consul.GenerateServiceKey(serfServ): serfServ,
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})
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}
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return nil
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}
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// setupClient is used to setup the client if enabled
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func (a *Agent) setupClient() error {
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if !a.config.Client.Enabled {
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return nil
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}
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// Setup the configuration
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conf, err := a.clientConfig()
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if err != nil {
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return fmt.Errorf("client setup failed: %v", err)
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}
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// Reserve some ports for the plugins if we are on Windows
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if runtime.GOOS == "windows" {
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if err := a.reservePortsForClient(conf); err != nil {
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return err
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}
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}
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// Create the client
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client, err := client.NewClient(conf, a.consulSyncer, a.logger)
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if err != nil {
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return fmt.Errorf("client setup failed: %v", err)
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}
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a.client = client
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// Create the Nomad Client services for Consul
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if a.config.Consul.AutoAdvertise {
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httpServ := &structs.Service{
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Name: a.config.Consul.ClientServiceName,
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PortLabel: a.clientHTTPAddr,
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Tags: []string{consul.ServiceTagHTTP},
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Checks: []*structs.ServiceCheck{
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&structs.ServiceCheck{
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Name: "Nomad Client HTTP Check",
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Type: "http",
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Path: "/v1/agent/servers",
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Protocol: "http", // TODO TLS
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Interval: clientHttpCheckInterval,
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Timeout: clientHttpCheckTimeout,
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},
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},
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}
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a.consulSyncer.SetServices(consul.ClientDomain, map[consul.ServiceKey]*structs.Service{
|
|
consul.GenerateServiceKey(httpServ): httpServ,
|
|
})
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// reservePortsForClient reserves a range of ports for the client to use when
|
|
// it creates various plugins for log collection, executors, drivers, etc
|
|
func (a *Agent) reservePortsForClient(conf *clientconfig.Config) error {
|
|
// finding the device name for loopback
|
|
deviceName, addr, mask, err := a.findLoopbackDevice()
|
|
if err != nil {
|
|
return fmt.Errorf("error finding the device name for loopback: %v", err)
|
|
}
|
|
|
|
// seeing if the user has already reserved some resources on this device
|
|
var nr *structs.NetworkResource
|
|
if conf.Node.Reserved == nil {
|
|
conf.Node.Reserved = &structs.Resources{}
|
|
}
|
|
for _, n := range conf.Node.Reserved.Networks {
|
|
if n.Device == deviceName {
|
|
nr = n
|
|
}
|
|
}
|
|
// If the user hasn't already created the device, we create it
|
|
if nr == nil {
|
|
nr = &structs.NetworkResource{
|
|
Device: deviceName,
|
|
IP: addr,
|
|
CIDR: mask,
|
|
ReservedPorts: make([]structs.Port, 0),
|
|
}
|
|
}
|
|
// appending the port ranges we want to use for the client to the list of
|
|
// reserved ports for this device
|
|
for i := conf.ClientMinPort; i <= conf.ClientMaxPort; i++ {
|
|
nr.ReservedPorts = append(nr.ReservedPorts, structs.Port{Label: fmt.Sprintf("plugin-%d", i), Value: int(i)})
|
|
}
|
|
conf.Node.Reserved.Networks = append(conf.Node.Reserved.Networks, nr)
|
|
return nil
|
|
}
|
|
|
|
// findLoopbackDevice iterates through all the interfaces on a machine and
|
|
// returns the ip addr, mask of the loopback device
|
|
func (a *Agent) findLoopbackDevice() (string, string, string, error) {
|
|
var ifcs []net.Interface
|
|
var err error
|
|
ifcs, err = net.Interfaces()
|
|
if err != nil {
|
|
return "", "", "", err
|
|
}
|
|
for _, ifc := range ifcs {
|
|
addrs, err := ifc.Addrs()
|
|
if err != nil {
|
|
return "", "", "", err
|
|
}
|
|
for _, addr := range addrs {
|
|
var ip net.IP
|
|
switch v := addr.(type) {
|
|
case *net.IPNet:
|
|
ip = v.IP
|
|
case *net.IPAddr:
|
|
ip = v.IP
|
|
}
|
|
if ip.IsLoopback() {
|
|
if ip.To4() == nil {
|
|
continue
|
|
}
|
|
return ifc.Name, ip.String(), addr.String(), nil
|
|
}
|
|
}
|
|
}
|
|
|
|
return "", "", "", fmt.Errorf("no loopback devices with IPV4 addr found")
|
|
}
|
|
|
|
// Leave is used gracefully exit. Clients will inform servers
|
|
// of their departure so that allocations can be rescheduled.
|
|
func (a *Agent) Leave() error {
|
|
if a.client != nil {
|
|
if err := a.client.Leave(); err != nil {
|
|
a.logger.Printf("[ERR] agent: client leave failed: %v", err)
|
|
}
|
|
}
|
|
if a.server != nil {
|
|
if err := a.server.Leave(); err != nil {
|
|
a.logger.Printf("[ERR] agent: server leave failed: %v", err)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Shutdown is used to terminate the agent.
|
|
func (a *Agent) Shutdown() error {
|
|
a.shutdownLock.Lock()
|
|
defer a.shutdownLock.Unlock()
|
|
|
|
if a.shutdown {
|
|
return nil
|
|
}
|
|
|
|
a.logger.Println("[INFO] agent: requesting shutdown")
|
|
if a.client != nil {
|
|
if err := a.client.Shutdown(); err != nil {
|
|
a.logger.Printf("[ERR] agent: client shutdown failed: %v", err)
|
|
}
|
|
}
|
|
if a.server != nil {
|
|
if err := a.server.Shutdown(); err != nil {
|
|
a.logger.Printf("[ERR] agent: server shutdown failed: %v", err)
|
|
}
|
|
}
|
|
|
|
if err := a.consulSyncer.Shutdown(); err != nil {
|
|
a.logger.Printf("[ERR] agent: shutting down consul service failed: %v", err)
|
|
}
|
|
|
|
a.logger.Println("[INFO] agent: shutdown complete")
|
|
a.shutdown = true
|
|
close(a.shutdownCh)
|
|
return nil
|
|
}
|
|
|
|
// RPC is used to make an RPC call to the Nomad servers
|
|
func (a *Agent) RPC(method string, args interface{}, reply interface{}) error {
|
|
if a.server != nil {
|
|
return a.server.RPC(method, args, reply)
|
|
}
|
|
return a.client.RPC(method, args, reply)
|
|
}
|
|
|
|
// Client returns the configured client or nil
|
|
func (a *Agent) Client() *client.Client {
|
|
return a.client
|
|
}
|
|
|
|
// Server returns the configured server or nil
|
|
func (a *Agent) Server() *nomad.Server {
|
|
return a.server
|
|
}
|
|
|
|
// Stats is used to return statistics for debugging and insight
|
|
// for various sub-systems
|
|
func (a *Agent) Stats() map[string]map[string]string {
|
|
stats := make(map[string]map[string]string)
|
|
if a.server != nil {
|
|
subStat := a.server.Stats()
|
|
for k, v := range subStat {
|
|
stats[k] = v
|
|
}
|
|
}
|
|
if a.client != nil {
|
|
subStat := a.client.Stats()
|
|
for k, v := range subStat {
|
|
stats[k] = v
|
|
}
|
|
}
|
|
return stats
|
|
}
|
|
|
|
// setupConsulSyncer creates the Consul tasks used by this Nomad Agent
|
|
// (either Client or Server mode).
|
|
func (a *Agent) setupConsulSyncer() error {
|
|
var err error
|
|
a.consulSyncer, err = consul.NewSyncer(a.config.Consul, a.shutdownCh, a.logger)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
a.consulSyncer.SetAddrFinder(func(portLabel string) (string, int) {
|
|
host, port, err := net.SplitHostPort(portLabel)
|
|
if err != nil {
|
|
p, err := strconv.Atoi(port)
|
|
if err != nil {
|
|
return "", 0
|
|
}
|
|
return "", p
|
|
}
|
|
|
|
// If the addr for the service is ":port", then we fall back
|
|
// to Nomad's default address resolution protocol.
|
|
//
|
|
// TODO(sean@): This should poll Consul to figure out what
|
|
// its advertise address is and use that in order to handle
|
|
// the case where there is something funky like NAT on this
|
|
// host. For now we just use the BindAddr if set, otherwise
|
|
// we fall back to a loopback addr.
|
|
if host == "" {
|
|
if a.config.BindAddr != "" {
|
|
host = a.config.BindAddr
|
|
} else {
|
|
host = "127.0.0.1"
|
|
}
|
|
}
|
|
p, err := strconv.Atoi(port)
|
|
if err != nil {
|
|
return host, 0
|
|
}
|
|
return host, p
|
|
})
|
|
|
|
return nil
|
|
}
|