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config.go
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config.go
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package params
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/url"
"os"
"path/filepath"
"strings"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p/discv5"
"github.com/ethereum/go-ethereum/params"
"github.com/status-im/status-go/static"
whisper "github.com/status-im/whisper/whisperv6"
validator "gopkg.in/go-playground/validator.v9"
)
// ----------
// LightEthConfig
// ----------
// LightEthConfig holds LES-related configuration
// Status nodes are always lightweight clients (due to mobile platform constraints)
type LightEthConfig struct {
// Enabled flag specifies whether protocol is enabled
Enabled bool
// DatabaseCache is memory (in MBs) allocated to internal caching (min 16MB / database forced)
DatabaseCache int
// TrustedNodes is a list of trusted servers
TrustedNodes []string
//MinTrustedFraction is minimum percentage of connected trusted servers to validate header(1-100)
MinTrustedFraction int
}
// ----------
// WhisperConfig
// ----------
// WhisperConfig holds SHH-related configuration
type WhisperConfig struct {
// Enabled flag specifies whether protocol is enabled
Enabled bool
// LightClient should be true if the node should start with an empty bloom filter and not forward messages from other nodes
LightClient bool
// EnableMailServer is mode when node is capable of delivering expired messages on demand
EnableMailServer bool
// DataDir is the file system folder Whisper should use for any data storage needs.
// For instance, MailServer will use this directory to store its data.
DataDir string
// MinimumPoW minimum PoW for Whisper messages
MinimumPoW float64
// MailServerPassword for symmetric encryption of whisper message history requests.
// (if no account file selected, then this password is used for symmetric encryption).
MailServerPassword string
// MailServerAsymKey is an hex-encoded asymmetric key to decrypt messages sent to MailServer.
MailServerAsymKey string
// MailServerRateLimit minimum time between queries to mail server per peer.
MailServerRateLimit int
// MailServerDataRetention is a number of days data should be stored by MailServer.
MailServerDataRetention int
// TTL time to live for messages, in seconds
TTL int
// EnableNTPSync enables NTP synchronizations
EnableNTPSync bool
// MaxMessageSize is a maximum size of a devp2p packet handled by the Whisper protocol,
// not only the size of envelopes sent in that packet.
MaxMessageSize uint32
// DatabaseConfig is configuration for which datastore we use
DatabaseConfig DatabaseConfig
}
type DatabaseConfig struct {
PGConfig PGConfig
}
type PGConfig struct {
// Enabled whether we should use a posgres instance
Enabled bool
// The URI of the server
URI string
}
// String dumps config object as nicely indented JSON
func (c *WhisperConfig) String() string {
data, _ := json.MarshalIndent(c, "", " ") // nolint: gas
return string(data)
}
// IncentivisationConfig holds incentivisation-related configuration
type IncentivisationConfig struct {
// Enabled flag specifies whether protocol is enabled
Enabled bool `validate:"required"`
// Endpoint for the RPC calls
RPCEndpoint string `validate:"required"`
// Contract address
ContractAddress string `validate:"required"`
// IP address that is used
IP string `validate:"required"`
// Port
Port uint16 `validate:"required"`
}
// String dumps config object as nicely indented JSON
func (c *IncentivisationConfig) String() string {
data, _ := json.MarshalIndent(c, "", " ") // nolint: gas
return string(data)
}
// Validate validates the IncentivisationConfig struct and returns an error if inconsistent values are found
func (c *IncentivisationConfig) Validate(validate *validator.Validate) error {
if err := validate.Struct(c); err != nil {
return err
}
return nil
}
// ----------
// SwarmConfig
// ----------
// SwarmConfig holds Swarm-related configuration
type SwarmConfig struct {
// Enabled flag specifies whether protocol is enabled
Enabled bool
}
// String dumps config object as nicely indented JSON
func (c *SwarmConfig) String() string {
data, _ := json.MarshalIndent(c, "", " ") // nolint: gas
return string(data)
}
// ----------
// ClusterConfig
// ----------
// ClusterConfig holds configuration for supporting cluster peers, which is a temporary
// means for mobile devices to get connected to Ethereum network (UDP-based discovery
// may not be available, so we need means to discover the network manually).
type ClusterConfig struct {
// Enabled flag specifies that nodes in this configuration are taken into account.
Enabled bool
// Fleet is a name of a selected fleet. If it has a value, nodes are loaded
// from a file, namely `fleet-*.{{ .Fleet }}.json`. Nodes can be added to any list
// in `ClusterConfig`.
Fleet string
// StaticNodes is a list of static nodes.
StaticNodes []string
// BootNodes is a list of bootnodes.
BootNodes []string
// TrustedMailServers is a list of verified and trusted Mail Server nodes.
TrustedMailServers []string
// RendezvousNodes is a list rendezvous discovery nodes.
RendezvousNodes []string
}
// String dumps config object as nicely indented JSON
func (c *ClusterConfig) String() string {
data, _ := json.MarshalIndent(c, "", " ") // nolint: gas
return string(data)
}
// Limits represent min and max amount of peers
type Limits struct {
Min, Max int
}
// NewLimits creates new Limits config with given min and max values.
func NewLimits(min, max int) Limits {
return Limits{
Min: min,
Max: max,
}
}
// ----------
// UpstreamRPCConfig
// ----------
// UpstreamRPCConfig stores configuration for upstream rpc connection.
type UpstreamRPCConfig struct {
// Enabled flag specifies whether feature is enabled
Enabled bool
// URL sets the rpc upstream host address for communication with
// a non-local infura endpoint.
URL string
}
// ----------
// NodeConfig
// ----------
// NodeConfig stores configuration options for a node
type NodeConfig struct {
// NetworkID sets network to use for selecting peers to connect to
NetworkID uint64 `json:"NetworkId" validate:"required"`
// DataDir is the file system folder the node should use for any data storage needs.
DataDir string `validate:"required"`
// KeyStoreDir is the file system folder that contains private keys.
KeyStoreDir string `validate:"required"`
// NodeKey is the hex-encoded node ID (private key). Should be a valid secp256k1 private key that will be used for both
// remote peer identification as well as network traffic encryption.
NodeKey string
// NoDiscovery set to true will disable discovery protocol.
NoDiscovery bool
// Rendezvous enables discovery protocol.
Rendezvous bool
// ListenAddr is an IP address and port of this node (e.g. 127.0.0.1:30303).
ListenAddr string
// AdvertiseAddr is a public IP address the node wants to be found with.
// It is especially useful when using floating IPs attached to a server.
AdvertiseAddr string
// Name sets the instance name of the node. It must not contain the / character.
Name string `validate:"excludes=/"`
// Version exposes program's version. It is used in the devp2p node identifier.
Version string
// APIModules is a comma-separated list of API modules exposed via *any* (HTTP/WS/IPC) RPC interface.
APIModules string
// HTTPEnabled specifies whether the http RPC server is to be enabled by default.
HTTPEnabled bool
// HTTPHost is the host interface on which to start the HTTP RPC server.
// Pass empty string if no HTTP RPC interface needs to be started.
HTTPHost string
// HTTPPort is the TCP port number on which to start the Geth's HTTP RPC server.
HTTPPort int
// HTTPVirtualHosts is the list of virtual hostnames which are allowed on incoming requests.
// This is by default {'localhost'}. Using this prevents attacks like
// DNS rebinding, which bypasses SOP by simply masquerading as being within the same
// origin. These attacks do not utilize CORS, since they are not cross-domain.
// By explicitly checking the Host-header, the server will not allow requests
// made against the server with a malicious host domain.
// Requests using an IP address directly are not affected.
HTTPVirtualHosts []string
// HTTPCors is the Cross-Origin Resource Sharing header to send to requesting
// clients. Please be aware that CORS is a browser enforced security, it's fully
// useless for custom HTTP clients.
HTTPCors []string
// IPCEnabled specifies whether IPC-RPC Server is enabled or not
IPCEnabled bool
// IPCFile is filename of exposed IPC RPC Server
IPCFile string
// TLSEnabled specifies whether TLS support should be enabled on node or not
// TLS support is only planned in go-ethereum, so we are using our own patch.
TLSEnabled bool
// MaxPeers is the maximum number of (global) peers that can be connected.
// Set to zero, if only static or trusted peers are allowed to connect.
MaxPeers int
// MaxPendingPeers is the maximum number of peers that can be pending in the
// handshake phase, counted separately for inbound and outbound connections.
MaxPendingPeers int
log log.Logger
// LogEnabled enables the logger
LogEnabled bool `json:"LogEnabled"`
// LogMobileSystem enables log redirection to android/ios system logger.
LogMobileSystem bool
// LogFile is filename where exposed logs get written to
LogFile string
// LogLevel defines minimum log level. Valid names are "ERROR", "WARN", "INFO", "DEBUG", and "TRACE".
LogLevel string `validate:"eq=ERROR|eq=WARN|eq=INFO|eq=DEBUG|eq=TRACE"`
// LogMaxBackups defines number of rotated log files that will be stored.
LogMaxBackups int
// LogMaxSize in megabytes after current size is reached log file will be rotated.
LogMaxSize int
// LogCompressRotated if true all rotated files will be gzipped.
LogCompressRotated bool
// LogToStderr defines whether logged info should also be output to os.Stderr
LogToStderr bool
// EnableStatusService should be true to enable methods under status namespace.
EnableStatusService bool
// UpstreamConfig extra config for providing upstream infura server.
UpstreamConfig UpstreamRPCConfig `json:"UpstreamConfig"`
// ClusterConfig extra configuration for supporting cluster peers.
ClusterConfig ClusterConfig `json:"ClusterConfig," validate:"structonly"`
// LightEthConfig extra configuration for LES
LightEthConfig LightEthConfig `json:"LightEthConfig," validate:"structonly"`
// WhisperConfig extra configuration for SHH
WhisperConfig WhisperConfig `json:"WhisperConfig," validate:"structonly"`
// IncentivisationConfig extra configuration for incentivisation service
IncentivisationConfig IncentivisationConfig `json:"IncentivisationConfig," validate:"structonly"`
// ShhextConfig extra configuration for service running under shhext namespace.
ShhextConfig ShhextConfig `json:"ShhextConfig," validate:"structonly"`
// WalletConfig extra configuration for wallet.Service.
WalletConfig WalletConfig
// SwarmConfig extra configuration for Swarm and ENS
SwarmConfig SwarmConfig `json:"SwarmConfig," validate:"structonly"`
// RegisterTopics a list of specific topics where the peer wants to be
// discoverable.
RegisterTopics []discv5.Topic `json:"RegisterTopics"`
// RequiredTopics list of topics where a client wants to search for
// discoverable peers with the discovery limits.
RequireTopics map[discv5.Topic]Limits `json:"RequireTopics"`
// MailServerRegistryAddress is the MailServerRegistry contract address
MailServerRegistryAddress string
}
// WalletConfig extra configuration for wallet.Service.
type WalletConfig struct {
Enabled bool
}
// ShhextConfig defines options used by shhext service.
type ShhextConfig struct {
PFSEnabled bool
// BackupDisabledDataDir is the file system folder the node should use for any data storage needs that it doesn't want backed up.
BackupDisabledDataDir string
// InstallationId id of the current installation
InstallationID string
// MailServerConfirmations should be true if client wants to receive confirmatons only from a selected mail servers.
MailServerConfirmations bool
// EnableConnectionManager turns on management of the mail server connections if true.
EnableConnectionManager bool
// EnableLastUsedMonitor guarantees that last used mail server will be tracked and persisted into the storage.
EnableLastUsedMonitor bool
// ConnectionTarget will be used by connection manager. It will ensure that we connected with configured number of servers.
ConnectionTarget int
// RequestsDelay used to ensure that no similar requests are sent within short periods of time.
RequestsDelay time.Duration
// MaxServerFailures defines maximum allowed expired requests before server will be swapped to another one.
MaxServerFailures int
// MaxMessageDeliveryAttempts defines how many times we will try to deliver not-acknowledged envelopes.
MaxMessageDeliveryAttempts int
// WhisperCacheDir is a folder where whisper filters may persist messages before delivering them
// to a client.
WhisperCacheDir string
}
// Validate validates the ShhextConfig struct and returns an error if inconsistent values are found
func (c *ShhextConfig) Validate(validate *validator.Validate) error {
if err := validate.Struct(c); err != nil {
return err
}
if c.PFSEnabled && len(c.BackupDisabledDataDir) == 0 {
return errors.New("field BackupDisabledDataDir is required if PFSEnabled is true")
}
return nil
}
// Option is an additional setting when creating a NodeConfig
// using NewNodeConfigWithDefaults.
type Option func(*NodeConfig) error
// WithFleet loads one of the preconfigured Status fleets.
func WithFleet(fleet string) Option {
return func(c *NodeConfig) error {
if fleet == FleetUndefined {
return nil
}
c.NoDiscovery = false
c.ClusterConfig.Enabled = true
return loadConfigFromAsset(fmt.Sprintf("../config/cli/fleet-%s.json", fleet), c)
}
}
// WithLES enabled LES protocol.
func WithLES() Option {
return func(c *NodeConfig) error {
return loadConfigFromAsset("../config/cli/les-enabled.json", c)
}
}
// WithMailserver enables MailServer.
func WithMailserver() Option {
return func(c *NodeConfig) error {
return loadConfigFromAsset("../config/cli/mailserver-enabled.json", c)
}
}
// NewNodeConfigWithDefaults creates new node configuration object
// with some defaults suitable for adhoc use.
func NewNodeConfigWithDefaults(dataDir string, networkID uint64, opts ...Option) (*NodeConfig, error) {
c, err := NewNodeConfig(dataDir, networkID)
if err != nil {
return nil, err
}
c.NoDiscovery = true
c.HTTPHost = ""
c.ListenAddr = ":30303"
c.LogEnabled = true
c.LogLevel = "INFO"
c.LogMaxSize = 100
c.LogCompressRotated = true
c.LogMaxBackups = 3
c.LogToStderr = true
c.WhisperConfig.Enabled = true
c.WhisperConfig.EnableNTPSync = true
for _, opt := range opts {
if err := opt(c); err != nil {
return nil, err
}
}
c.updatePeerLimits()
if err := c.Validate(); err != nil {
return nil, err
}
return c, nil
}
// NewNodeConfigWithDefaultsAndFiles creates new node configuration object
// with some defaults suitable for adhoc use and applies config files on top.
func NewNodeConfigWithDefaultsAndFiles(
dataDir string, networkID uint64, opts []Option, files []string,
) (*NodeConfig, error) {
c, err := NewNodeConfigWithDefaults(dataDir, networkID, opts...)
if err != nil {
return nil, err
}
for _, file := range files {
if err := loadConfigConfigFromFile(file, c); err != nil {
return nil, err
}
}
c.updatePeerLimits()
if err := c.Validate(); err != nil {
return nil, err
}
return c, nil
}
// updatePeerLimits will set default peer limits expectations based on enabled services.
func (c *NodeConfig) updatePeerLimits() {
if c.NoDiscovery && !c.Rendezvous {
return
}
if c.WhisperConfig.Enabled {
c.RequireTopics[WhisperDiscv5Topic] = WhisperDiscv5Limits
// TODO(dshulyak) register mailserver limits when we will change how they are handled.
}
if c.LightEthConfig.Enabled {
c.RequireTopics[discv5.Topic(LesTopic(int(c.NetworkID)))] = LesDiscoveryLimits
}
}
// NewNodeConfig creates new node configuration object with bare-minimum defaults.
// Important: the returned config is not validated.
func NewNodeConfig(dataDir string, networkID uint64) (*NodeConfig, error) {
var keyStoreDir, wnodeDir string
if dataDir != "" {
keyStoreDir = filepath.Join(dataDir, "keystore")
}
if dataDir != "" {
wnodeDir = filepath.Join(dataDir, "wnode")
}
config := &NodeConfig{
NetworkID: networkID,
DataDir: dataDir,
KeyStoreDir: keyStoreDir,
Version: Version,
HTTPHost: "localhost",
HTTPPort: 8545,
HTTPVirtualHosts: []string{"localhost"},
ListenAddr: ":0",
APIModules: "eth,net,web3,peer,wallet",
MaxPeers: 25,
MaxPendingPeers: 0,
IPCFile: "geth.ipc",
log: log.New("package", "status-go/params.NodeConfig"),
LogFile: "",
LogLevel: "ERROR",
NoDiscovery: true,
UpstreamConfig: UpstreamRPCConfig{
URL: getUpstreamURL(networkID),
},
LightEthConfig: LightEthConfig{
DatabaseCache: 16,
},
WhisperConfig: WhisperConfig{
DataDir: wnodeDir,
MinimumPoW: WhisperMinimumPoW,
TTL: WhisperTTL,
MaxMessageSize: whisper.DefaultMaxMessageSize,
},
ShhextConfig: ShhextConfig{
BackupDisabledDataDir: dataDir,
},
SwarmConfig: SwarmConfig{},
RegisterTopics: []discv5.Topic{},
RequireTopics: map[discv5.Topic]Limits{},
}
return config, nil
}
// NewConfigFromJSON parses incoming JSON and returned it as Config
func NewConfigFromJSON(configJSON string) (*NodeConfig, error) {
config, err := NewNodeConfig("", 0)
if err != nil {
return nil, err
}
if err := loadConfigFromJSON(configJSON, config); err != nil {
return nil, err
}
if err := config.Validate(); err != nil {
return nil, err
}
return config, nil
}
func loadConfigFromJSON(configJSON string, nodeConfig *NodeConfig) error {
decoder := json.NewDecoder(strings.NewReader(configJSON))
// override default configuration with values by JSON input
return decoder.Decode(&nodeConfig)
}
func loadConfigConfigFromFile(path string, config *NodeConfig) error {
jsonConfig, err := ioutil.ReadFile(path)
if err != nil {
return err
}
return loadConfigFromJSON(string(jsonConfig), config)
}
func loadConfigFromAsset(name string, config *NodeConfig) error {
data, err := static.Asset(name)
if err != nil {
return err
}
return loadConfigFromJSON(string(data), config)
}
// Validate checks if NodeConfig fields have valid values.
//
// It returns nil if there are no errors, otherwise one or more errors
// can be returned. Multiple errors are joined with a new line.
//
// A single error for a struct:
//
// type TestStruct struct {
// TestField string `validate:"required"`
// }
//
// has the following format:
//
// Key: 'TestStruct.TestField' Error:Field validation for 'TestField' failed on the 'required' tag
//
// nolint: gocyclo
func (c *NodeConfig) Validate() error {
validate := NewValidator()
if err := validate.Struct(c); err != nil {
return err
}
if c.NodeKey != "" {
if _, err := crypto.HexToECDSA(c.NodeKey); err != nil {
return fmt.Errorf("NodeKey is invalid (%s): %v", c.NodeKey, err)
}
}
if c.UpstreamConfig.Enabled && c.LightEthConfig.Enabled {
return fmt.Errorf("both UpstreamConfig and LightEthConfig are enabled, but they are mutually exclusive")
}
if err := c.validateChildStructs(validate); err != nil {
return err
}
// Whisper's data directory must be relative to the main data directory
// if EnableMailServer is true.
if c.WhisperConfig.Enabled && c.WhisperConfig.EnableMailServer {
if !strings.HasPrefix(c.WhisperConfig.DataDir, c.DataDir) {
return fmt.Errorf("WhisperConfig.DataDir must start with DataDir fragment")
}
}
if !c.NoDiscovery && len(c.ClusterConfig.BootNodes) == 0 {
// No point in running discovery if we don't have bootnodes.
// In case we do have bootnodes, NoDiscovery should be true.
return fmt.Errorf("NoDiscovery is false, but ClusterConfig.BootNodes is empty")
}
if c.ShhextConfig.PFSEnabled && len(c.ShhextConfig.InstallationID) == 0 {
return fmt.Errorf("PFSEnabled is true, but InstallationID is empty")
}
if len(c.ClusterConfig.RendezvousNodes) == 0 {
if c.Rendezvous {
return fmt.Errorf("Rendezvous is enabled, but ClusterConfig.RendezvousNodes is empty")
}
} else if !c.Rendezvous {
return fmt.Errorf("Rendezvous is disabled, but ClusterConfig.RendezvousNodes is not empty")
}
return nil
}
func (c *NodeConfig) validateChildStructs(validate *validator.Validate) error {
// Validate child structs
if err := c.UpstreamConfig.Validate(validate); err != nil {
return err
}
if err := c.ClusterConfig.Validate(validate); err != nil {
return err
}
if err := c.LightEthConfig.Validate(validate); err != nil {
return err
}
if err := c.WhisperConfig.Validate(validate); err != nil {
return err
}
if err := c.SwarmConfig.Validate(validate); err != nil {
return err
}
if err := c.ShhextConfig.Validate(validate); err != nil {
return err
}
if c.IncentivisationConfig.Enabled {
if err := c.IncentivisationConfig.Validate(validate); err != nil {
return err
}
}
return nil
}
// Validate validates the UpstreamRPCConfig struct and returns an error if inconsistent values are found
func (c *UpstreamRPCConfig) Validate(validate *validator.Validate) error {
if !c.Enabled {
return nil
}
if err := validate.Struct(c); err != nil {
return err
}
if _, err := url.ParseRequestURI(c.URL); err != nil {
return fmt.Errorf("UpstreamRPCConfig.URL '%s' is invalid: %v", c.URL, err.Error())
}
return nil
}
// Validate validates the ClusterConfig struct and returns an error if inconsistent values are found
func (c *ClusterConfig) Validate(validate *validator.Validate) error {
if !c.Enabled {
return nil
}
if err := validate.Struct(c); err != nil {
return err
}
return nil
}
// Validate validates the LightEthConfig struct and returns an error if inconsistent values are found
func (c *LightEthConfig) Validate(validate *validator.Validate) error {
if !c.Enabled {
return nil
}
if err := validate.Struct(c); err != nil {
return err
}
return nil
}
// Validate validates the WhisperConfig struct and returns an error if inconsistent values are found
func (c *WhisperConfig) Validate(validate *validator.Validate) error {
if !c.Enabled {
return nil
}
if err := validate.Struct(c); err != nil {
return err
}
if c.EnableMailServer {
if c.DataDir == "" {
return fmt.Errorf("WhisperConfig.DataDir must be specified when WhisperConfig.EnableMailServer is true")
}
if c.MailServerPassword == "" && c.MailServerAsymKey == "" {
return fmt.Errorf("WhisperConfig.MailServerPassword or WhisperConfig.MailServerAsymKey must be specified when WhisperConfig.EnableMailServer is true")
}
if c.MailServerAsymKey != "" {
if _, err := crypto.HexToECDSA(c.MailServerAsymKey); err != nil {
return fmt.Errorf("WhisperConfig.MailServerAsymKey is invalid: %s", c.MailServerAsymKey)
}
}
}
return nil
}
// Validate validates the SwarmConfig struct and returns an error if inconsistent values are found
func (c *SwarmConfig) Validate(validate *validator.Validate) error {
if !c.Enabled {
return nil
}
if err := validate.Struct(c); err != nil {
return err
}
return nil
}
func getUpstreamURL(networkID uint64) string {
switch networkID {
case MainNetworkID:
return MainnetEthereumNetworkURL
case RopstenNetworkID:
return RopstenEthereumNetworkURL
case RinkebyNetworkID:
return RinkebyEthereumNetworkURL
case GoerliNetworkID:
return GoerliEthereumNetworkURL
}
return ""
}
// Save dumps configuration to the disk
func (c *NodeConfig) Save() error {
data, err := json.MarshalIndent(c, "", " ")
if err != nil {
return err
}
if err := os.MkdirAll(c.DataDir, os.ModePerm); err != nil {
return err
}
configFilePath := filepath.Join(c.DataDir, "config.json")
if err := ioutil.WriteFile(configFilePath, data, os.ModePerm); err != nil {
return err
}
c.log.Info("config file saved", "path", configFilePath)
return nil
}
// String dumps config object as nicely indented JSON
func (c *NodeConfig) String() string {
data, _ := json.MarshalIndent(c, "", " ")
return string(data)
}
// FormatAPIModules returns a slice of APIModules.
func (c *NodeConfig) FormatAPIModules() []string {
if len(c.APIModules) == 0 {
return nil
}
return strings.Split(c.APIModules, ",")
}
// AddAPIModule adds a mobule to APIModules
func (c *NodeConfig) AddAPIModule(m string) {
c.APIModules = fmt.Sprintf("%s,%s", c.APIModules, m)
}
// LesTopic returns discovery v5 topic derived from genesis of the provided network.
// 1 - mainnet, 3 - ropsten, 4 - rinkeby
func LesTopic(netid int) string {
switch netid {
case 1:
return LESDiscoveryIdentifier + common.Bytes2Hex(params.MainnetGenesisHash.Bytes()[:8])
case 3:
return LESDiscoveryIdentifier + common.Bytes2Hex(params.TestnetGenesisHash.Bytes()[:8])
case 4:
return LESDiscoveryIdentifier + common.Bytes2Hex(params.RinkebyGenesisHash.Bytes()[:8])
default:
return ""
}
}