discover

package
v1.123.4 Latest Latest
Warning

This package is not in the latest version of its module.

Go to latest
Published: Mar 25, 2022 License: GPL-3.0 Imports: 27 Imported by: 0

Documentation

Overview

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

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Config

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

	// These settings are optional:
	NetRestrict  *netutil.Netlist   // list of allowed IP networks
	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

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

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

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 TalkRequestHandler

type TalkRequestHandler func(enode.ID, *net.UDPAddr, []byte) []byte

TalkRequestHandler callback processes a talk request and optionally returns a reply

type UDPConn

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

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

UDPv4 implements the v4 wire protocol.

func ListenUDP

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

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

func ListenV4

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

func (*UDPv4) Close

func (t *UDPv4) Close()

Close shuts down the socket and aborts any running queries.

func (*UDPv4) LookupPubkey

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

LookupPubkey finds the closest nodes to the given public key.

func (*UDPv4) Ping

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

Ping sends a ping message to the given node.

func (*UDPv4) RandomNodes

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

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

func (*UDPv4) RequestENR

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

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

func (t *UDPv4) Self() *enode.Node

Self returns the local node.

type UDPv5

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

UDPv5 is the implementation of protocol version 5.

func ListenV5

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

ListenV5 listens on the given connection.

func (*UDPv5) AllNodes

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

AllNodes returns all the nodes stored in the local table.

func (*UDPv5) Close

func (t *UDPv5) Close()

Close shuts down packet processing.

func (*UDPv5) LocalNode

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

LocalNode returns the current local node running the protocol.

func (*UDPv5) Lookup

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

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

Ping sends a ping message to the given node.

func (*UDPv5) RandomNodes

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

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

func (*UDPv5) RegisterTalkHandler

func (t *UDPv5) RegisterTalkHandler(protocol string, handler TalkRequestHandler)

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

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

requestENR requests n's record.

func (*UDPv5) Resolve

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

func (t *UDPv5) Self() *enode.Node

Self returns the local node record.

func (*UDPv5) TalkRequest

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

Path Synopsis
Package v4wire implements the Discovery v4 Wire Protocol.
Package v4wire implements the Discovery v4 Wire Protocol.

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL