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package discover

import "github.com/ethereum/go-ethereum/p2p/discover"

Package discover implements the Node Discovery Protocol.

The Node Discovery protocol provides a way to find RLPx nodes that can be connected to. It uses a Kademlia-like protocol to maintain a distributed database of the IDs and endpoints of all listening nodes.

Index

Package Files

common.go lookup.go node.go ntp.go table.go v4_udp.go v5_udp.go

type Config Uses

❖
type Config struct {
    // These settings are required and configure the UDP listener:
    PrivateKey *ecdsa.PrivateKey

    // These settings are optional:
    NetRestrict  *netutil.Netlist   // network whitelist
    Bootnodes    []*enode.Node      // list of bootstrap nodes
    Unhandled    chan<- ReadPacket  // unhandled packets are sent on this channel
    Log          log.Logger         // if set, log messages go here
    ValidSchemes enr.IdentityScheme // allowed identity schemes
    Clock        mclock.Clock
}

Config holds settings for the discovery listener.

type ReadPacket Uses

❖
type ReadPacket struct {
    Data []byte
    Addr *net.UDPAddr
}

ReadPacket is a packet that couldn't be handled. Those packets are sent to the unhandled channel if configured.

type Table Uses

❖
type Table struct {
    // contains filtered or unexported fields
}

Table is the 'node table', a Kademlia-like index of neighbor nodes. The table keeps itself up-to-date by verifying the liveness of neighbors and requesting their node records when announcements of a new record version are received.

func (*Table) ReadRandomNodes Uses

❖
func (tab *Table) ReadRandomNodes(buf []*enode.Node) (n int)

ReadRandomNodes fills the given slice with random nodes from the table. The results are guaranteed to be unique for a single invocation, no node will appear twice.

type UDPConn Uses

❖
type UDPConn interface {
    ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error)
    WriteToUDP(b []byte, addr *net.UDPAddr) (n int, err error)
    Close() error
    LocalAddr() net.Addr
}

UDPConn is a network connection on which discovery can operate.

type UDPv4 Uses

❖
type UDPv4 struct {
    // contains filtered or unexported fields
}

UDPv4 implements the v4 wire protocol.

func ListenUDP Uses

❖
func ListenUDP(c UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv4, error)

ListenUDP starts listening for discovery packets on the given UDP socket.

func ListenV4 Uses

❖
func ListenV4(c UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv4, error)

func (*UDPv4) Close Uses

❖
func (t *UDPv4) Close()

Close shuts down the socket and aborts any running queries.

func (*UDPv4) LookupPubkey Uses

❖
func (t *UDPv4) LookupPubkey(key *ecdsa.PublicKey) []*enode.Node

LookupPubkey finds the closest nodes to the given public key.

func (*UDPv4) Ping Uses

❖
func (t *UDPv4) Ping(n *enode.Node) error

Ping sends a ping message to the given node.

func (*UDPv4) RandomNodes Uses

❖
func (t *UDPv4) RandomNodes() enode.Iterator

RandomNodes is an iterator yielding nodes from a random walk of the DHT.

func (*UDPv4) RequestENR Uses

❖
func (t *UDPv4) RequestENR(n *enode.Node) (*enode.Node, error)

RequestENR sends enrRequest to the given node and waits for a response.

func (*UDPv4) Resolve Uses

❖
func (t *UDPv4) Resolve(n *enode.Node) *enode.Node

Resolve searches for a specific node with the given ID and tries to get the most recent version of the node record for it. It returns n if the node could not be resolved.

func (*UDPv4) Self Uses

❖
func (t *UDPv4) Self() *enode.Node

Self returns the local node.

type UDPv5 Uses

❖
type UDPv5 struct {
    // contains filtered or unexported fields
}

UDPv5 is the implementation of protocol version 5.

func ListenV5 Uses

❖
func ListenV5(conn UDPConn, ln *enode.LocalNode, cfg Config) (*UDPv5, error)

ListenV5 listens on the given connection.

func (*UDPv5) AllNodes Uses

❖
func (t *UDPv5) AllNodes() []*enode.Node

AllNodes returns all the nodes stored in the local table.

func (*UDPv5) Close Uses

❖
func (t *UDPv5) Close()

Close shuts down packet processing.

func (*UDPv5) LocalNode Uses

❖
func (t *UDPv5) LocalNode() *enode.LocalNode

LocalNode returns the current local node running the protocol.

func (*UDPv5) Lookup Uses

❖
func (t *UDPv5) Lookup(target enode.ID) []*enode.Node

Lookup performs a recursive lookup for the given target. It returns the closest nodes to target.

func (*UDPv5) Ping Uses

❖
func (t *UDPv5) Ping(n *enode.Node) error

Ping sends a ping message to the given node.

func (*UDPv5) RandomNodes Uses

❖
func (t *UDPv5) RandomNodes() enode.Iterator

RandomNodes returns an iterator that finds random nodes in the DHT.

func (*UDPv5) RegisterTalkHandler Uses

❖
func (t *UDPv5) RegisterTalkHandler(protocol string, handler func([]byte) []byte)

RegisterTalkHandler adds a handler for 'talk requests'. The handler function is called whenever a request for the given protocol is received and should return the response data or nil.

func (*UDPv5) RequestENR Uses

❖
func (t *UDPv5) RequestENR(n *enode.Node) (*enode.Node, error)

requestENR requests n's record.

func (*UDPv5) Resolve Uses

❖
func (t *UDPv5) Resolve(n *enode.Node) *enode.Node

Resolve searches for a specific node with the given ID and tries to get the most recent version of the node record for it. It returns n if the node could not be resolved.

func (*UDPv5) Self Uses

❖
func (t *UDPv5) Self() *enode.Node

Self returns the local node record.

func (*UDPv5) TalkRequest Uses

❖
func (t *UDPv5) TalkRequest(n *enode.Node, protocol string, request []byte) ([]byte, error)

TalkRequest sends a talk request to n and waits for a response.

Directories

PathSynopsis
v4wirePackage v4wire implements the Discovery v4 Wire Protocol.
v5wire

Package discover imports 28 packages (graph) and is imported by 1384 packages. Updated 2020-11-30. Refresh now. Tools for package owners.