p2p

package
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 Go to latest Published: Aug 11, 2023 License: GPL-3.0 Imports: 28 Imported by: 1

Documentation

Overview

Package p2p implements the Ethereum p2p network protocols.

Index

Constants

View Source 
const (
	DefaultNodeName = "znn-node"

	DefaultListenHost = "0.0.0.0"
	DefaultListenPort = 35995
	DefaultHTTPPort   = 35997
	DefaultWSPort     = 35998

	DefaultMinPeers          = 8
	DefaultMaxPeers          = 60
	DefaultMaxPendingPeers   = 10
	DefaultMinConnectedPeers = 16

	DefaultNetDirName        = "network"
	DefaultNetPrivateKeyFile = "network-private-key"
)

Variables

View Source 
var (
	DefaultSeeders = []string{}/* 116 elements not displayed */

)
View Source 
var ErrPipeClosed = errors.New("p2p: read or write on closed message pipe")

ErrPipeClosed is returned from pipe operations after the pipe has been closed.

Functions

func Decrypt 

func Decrypt(prv *ecdsa.PrivateKey, ct []byte) ([]byte, error)

func ExpectMsg 

func ExpectMsg(r MsgReader, code uint64, content interface{}) error

ExpectMsg reads a message from r and verifies that its code and encoded RLP content match the provided values. If content is nil, the payload is discarded and not verified.

func MsgPipe 

func MsgPipe() (*MsgPipeRW, *MsgPipeRW)

MsgPipe creates a message pipe. Reads on one end are matched with writes on the other. The pipe is full-duplex, both ends implement MsgReadWriter.

func Send 

func Send(w MsgWriter, msgcode uint64, data interface{}) error

Send writes an RLP-encoded message with the given code. data should encode as an RLP list.

func SendItems 

func SendItems(w MsgWriter, msgcode uint64, elems ...interface{}) error

SendItems writes an RLP with the given code and data elements. For a call such as: 

SendItems(w, code, e1, e2, e3)

the message payload will be an RLP list containing the items: 

[e1, e2, e3]

func ToECDSAPub 

func ToECDSAPub(pub []byte) *ecdsa.PublicKey

Types

type Cap 

type Cap struct {
	Name    string
	Version uint
}

Cap is the structure of a peer capability.

func (Cap) RlpData 

func (cap Cap) RlpData() interface{}

func (Cap) String 

func (cap Cap) String() string

type DiscReason 

type DiscReason uint
const (
	DiscRequested DiscReason = iota
	DiscNetworkError
	DiscProtocolError
	DiscUselessPeer
	DiscTooManyPeers
	DiscAlreadyConnected
	DiscIncompatibleVersion
	DiscInvalidIdentity
	DiscQuitting
	DiscUnexpectedIdentity
	DiscSelf
	DiscReadTimeout
	DiscSubprotocolError
)

func (DiscReason) Error 

func (d DiscReason) Error() string

func (DiscReason) String 

func (d DiscReason) String() string

type Msg 

type Msg struct {
	Code       uint64
	Size       uint32 // size of the paylod
	Payload    io.Reader
	ReceivedAt time.Time
}

Msg defines the structure of a p2p message.

Note that a Msg can only be sent once since the Payload reader is consumed during sending. It is not possible to create a Msg and send it any number of times. If you want to reuse an encoded structure, encode the payload into a byte array and create a separate Msg with a bytes.Reader as Payload for each send.

func (Msg) Decode 

func (msg Msg) Decode(val interface{}) error

Decode parses the RLP content of a message into the given value, which must be a pointer.

For the decoding rules, please see package rlp.

func (Msg) Discard 

func (msg Msg) Discard() error

Discard reads any remaining payload data into a black hole.

func (Msg) String 

func (msg Msg) String() string

type MsgPipeRW 

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

MsgPipeRW is an endpoint of a MsgReadWriter pipe.

func (*MsgPipeRW) Close 

func (p *MsgPipeRW) Close() error

Close unblocks any pending ReadMsg and WriteMsg calls on both ends of the pipe. They will return ErrPipeClosed. Close also interrupts any reads from a message payload.

func (*MsgPipeRW) ReadMsg 

func (p *MsgPipeRW) ReadMsg() (Msg, error)

ReadMsg returns a message sent on the other end of the pipe.

func (*MsgPipeRW) WriteMsg 

func (p *MsgPipeRW) WriteMsg(msg Msg) error

WriteMsg sends a messsage on the pipe. It blocks until the receiver has consumed the message payload.

type MsgReadWriter 

type MsgReadWriter interface {
	MsgReader
	MsgWriter
}

MsgReadWriter provides reading and writing of encoded messages. Implementations should ensure that ReadMsg and WriteMsg can be called simultaneously from multiple goroutines.

type MsgReader 

type MsgReader interface {
	ReadMsg() (Msg, error)
}

type MsgWriter 

type MsgWriter interface {
	// WriteMsg sends a message. It will block until the message's
	// Payload has been consumed by the other end.
	//
	// Note that messages can be sent only once because their
	// payload reader is drained.
	WriteMsg(Msg) error
}

type Net 

type Net struct {

	// Absolute path to PrivateKeyFile.
	// (defaults to .znn/ DefaultNetPrivateKeyFile on linux).
	// If Config.DataDir changes, this reflects changes accordingly.
	PrivateKeyFile string

	// MaxPeers is the maximum number of peers that can be
	// connected. It must be greater than zero.
	MaxPeers int

	// MinConnectedPeers is the minimum number of peers that can be connected
	MinConnectedPeers int

	// MaxPendingPeers is the maximum number of peers that can be pending in the
	// handshake phase, counted separately for inbound and outbound connections.
	// Zero defaults to preset values.
	MaxPendingPeers int

	// Name sets the node name of this server.
	Name string

	Seeders []string

	// NodeDatabase is the path to the database containing the previously seen
	// live nodes in the network.
	NodeDatabase string

	// If ListenAddr is set to a non-nil address, the server
	// will listen for incoming connections.
	//
	// If the port is zero, the operating system will pick a port. The
	// ListenAddr field will be updated with the actual address when
	// the server is started.
	ListenAddr string
	ListenPort int
	// contains filtered or unexported fields
}

func (*Net) Nodes 

func (c *Net) Nodes() ([]*discover.Node, error)

func (*Net) PrivateKey 

func (c *Net) PrivateKey() *ecdsa.PrivateKey

PrivateKey retrieves the currently configured private key of the node, checking first any manually set key, falling back to the one found in the configured data folder. If no key can be found, a new one is generated.

type Peer 

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

Peer represents a connected remote node.

func NewPeer 

func NewPeer(id discover.NodeID, name string, caps []Cap) *Peer

NewPeer returns a peer for testing purposes.

func (*Peer) Caps 

func (p *Peer) Caps() []Cap

Caps returns the capabilities (supported subprotocols) of the remote peer.

func (*Peer) Disconnect 

func (p *Peer) Disconnect(reason DiscReason)

Disconnect terminates the peer connection with the given reason. It returns immediately and does not wait until the connection is closed.

func (*Peer) ID 

func (p *Peer) ID() discover.NodeID

ID returns the node's public key.

func (*Peer) LocalAddr 

func (p *Peer) LocalAddr() net.Addr

LocalAddr returns the local address of the network connection.

func (*Peer) Name 

func (p *Peer) Name() string

Name returns the node name that the remote node advertised.

func (*Peer) RemoteAddr 

func (p *Peer) RemoteAddr() net.Addr

RemoteAddr returns the remote address of the network connection.

func (*Peer) String 

func (p *Peer) String() string

String implements fmt.Stringer.

type Protocol 

type Protocol struct {
	// Name should contain the official protocol name,
	// often a three-letter word.
	Name string

	// Version should contain the version number of the protocol.
	Version uint

	// Length should contain the number of message codes used
	// by the protocol.
	Length uint64

	// Run is called in a new groutine when the protocol has been
	// negotiated with a peer. It should read and write messages from
	// rw. The Payload for each message must be fully consumed.
	//
	// The peer connection is closed when Start returns. It should return
	// any protocol-level error (such as an I/O error) that is
	// encountered.
	Run func(peer *Peer, rw MsgReadWriter) error
}

Protocol represents a P2P subprotocol implementation.

type Server 

type Server struct {
	// This field must be set to a valid secp256k1 private key.
	PrivateKey *ecdsa.PrivateKey

	// MaxPeers is the maximum number of peers that can be
	// connected. It must be greater than zero.
	MaxPeers int

	// MinConnectedPeers is the minimum number of peers that can be connected.
	MinConnectedPeers int

	// MaxPendingPeers is the maximum number of peers that can be pending in the
	// handshake phase, counted separately for inbound and outbound connections.
	// Zero defaults to preset values.
	MaxPendingPeers int

	// Discovery specifies whether the peer discovery mechanism should be started
	// or not. Disabling is usually useful for protocol debugging (manual topology).
	Discovery bool

	// Name sets the node name of this server.
	// Use common.MakeName to create a name that follows existing conventions.
	Name string

	// Bootstrap nodes are used to establish connectivity
	// with the rest of the network.
	BootstrapNodes []*discover.Node

	// Static nodes are used as pre-configured connections which are always
	// maintained and re-connected on disconnects.
	StaticNodes []*discover.Node

	// Trusted nodes are used as pre-configured connections which are always
	// allowed to connect, even above the peer limit.
	TrustedNodes []*discover.Node

	// NodeDatabase is the path to the database containing the previously seen
	// live nodes in the network.
	NodeDatabase string

	// Protocols should contain the protocols supported
	// by the server. Matching protocols are launched for
	// each peer.
	Protocols []Protocol

	// If ListenAddr is set to a non-nil address, the server
	// will listen for incoming connections.
	//
	// If the port is zero, the operating system will pick a port. The
	// ListenAddr field will be updated with the actual address when
	// the server is started.
	ListenAddr string

	// If set to a non-nil value, the given NAT port mapper
	// is used to make the listening port available to the
	// Internet.
	NAT nat.Interface

	// If Dialer is set to a non-nil value, the given Dialer
	// is used to dial outbound peer connections.
	Dialer *net.Dialer

	// If NoDial is true, the server will not dial any peers.
	NoDial bool
	// contains filtered or unexported fields
}

Server manages all peer connections.

The fields of Server are used as configuration parameters. You should set them before starting the Server. Fields may not be modified while the server is running.

func (*Server) AddPeer 

func (srv *Server) AddPeer(node *discover.Node)

AddPeer connects to the given node and maintains the connection until the server is shut down. If the connection fails for any reason, the server will attempt to reconnect the peer.

func (*Server) PeerCount 

func (srv *Server) PeerCount() int

PeerCount returns the number of connected peers.

func (*Server) Peers 

func (srv *Server) Peers() []*Peer

Peers returns all connected peers.

func (*Server) Self 

func (srv *Server) Self() *discover.Node

Self returns the local node's endpoint information.

func (*Server) Start 

func (srv *Server) Start() (err error)

Start starts running the server. Servers can not be re-used after stopping.

func (*Server) Stop 

func (srv *Server) Stop()

Stop terminates the server and all active peer connections. It blocks until all active connections have been closed.

Source Files

View all Source files

Directories

Path Synopsis
Package discover implements the Node Discovery Protocol.
 Package discover implements the Node Discovery Protocol.
Package nat provides access to common network port mapping protocols.
 Package nat provides access to common network port mapping protocols.

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