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Published: Jul 13, 2019 License: LGPL-3.0 Imports: 44 Imported by: 0



Package p2p implements the Ethereum p2p network protocols.




View Source
const (
	// OPLength Op length
	OPLength = 1
	// RPCIDLength rpc length
	RPCIDLength = 8
	// PreP2PLength preP2PLength
	PreP2PLength = OPLength + RPCIDLength


View Source
var (
	//OPNonRPCMap no return rpc Op
	OPNonRPCMap = map[P2PCommandOp]func(P2PCommandOp, []byte){
		Hello:                 handleError,
		NewTipMsg:             handleNewTip,
		NewTransactionListMsg: handleNewTransactionList,

	//OpRPCMap have return rpc Op
	OpRPCMap = map[P2PCommandOp]msgHandleSt{
		GetPeerListRequestMsg: {
			// contains filtered or unexported fields
		GetRootBlockHeaderListRequestMsg: {
			// contains filtered or unexported fields
		GetRootBlockListRequestMsg: {
			// contains filtered or unexported fields

	//PeerShardOpRPCMap used in virtual connection between local shard and remote shard
	PeerShardOpRPCMap = map[P2PCommandOp]msgHandleSt{
		GetMinorBlockListResponseMsg: {
			// contains filtered or unexported fields
		GetMinorBlockHeaderListRequestMsg: {
			// contains filtered or unexported fields
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.

View Source
var (
	ErrShuttingDown = errors.New("shutting down")

OPSerializerMap Op and its struct


func Encrypt

func Encrypt(metadata Metadata, op P2PCommandOp, ipcID uint64, cmd interface{}) ([]byte, error)

Encrypt encrypt Data to byte array

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 GetPrivateKeyFromConfig

func GetPrivateKeyFromConfig(configKey string) (*ecdsa.PrivateKey, error)

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.

rw1, rw2 := MsgPipe()
go func() {
	Send(rw1, 8, [][]byte{{0, 0}})
	Send(rw1, 5, [][]byte{{1, 1}})

for {
	msg, err := rw2.ReadMsg()
	if err != nil {
	var data [][]byte
	fmt.Printf("msg: %d, %x\n", msg.Code, data[0])

msg: 8, 0000
msg: 5, 0101

func NewQKCRlp

func NewQKCRlp(fd net.Conn) transport

NewQKCRlp new qkc rlp

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]


type Cap

type Cap struct {
	Name    string
	Version uint

Cap is the structure of a peer capability.

func (Cap) String

func (cap Cap) String() string

type Config

type Config struct {
	// This field must be set to a valid secp256k1 private key.
	PrivateKey *ecdsa.PrivateKey `toml:"-"`

	// MaxPeers is the maximum number of peers that can be
	// connected. It must be greater than zero.
	MaxPeers 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 `toml:",omitempty"`

	// DialRatio controls the ratio of inbound to dialed connections.
	// Example: a DialRatio of 2 allows 1/2 of connections to be dialed.
	// Setting DialRatio to zero defaults it to 3.
	DialRatio int `toml:",omitempty"`

	// NoDiscovery can be used to disable the peer discovery mechanism.
	// Disabling is useful for protocol debugging (manual topology).
	NoDiscovery bool

	// DiscoveryV5 specifies whether the new topic-discovery based V5 discovery
	// protocol should be started or not.
	DiscoveryV5 bool `toml:",omitempty"`

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

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

	// BootstrapNodesV5 are used to establish connectivity
	// with the rest of the network using the V5 discovery
	// protocol.
	BootstrapNodesV5 []*discv5.Node `toml:",omitempty"`

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

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

	// Connectivity can be restricted to certain IP networks.
	// If this option is set to a non-nil value, only hosts which match one of the
	// IP networks contained in the list are considered.
	NetRestrict *netutil.Netlist `toml:",omitempty"`

	// NodeDatabase is the path to the database containing the previously seen
	// live nodes in the network.
	NodeDatabase string `toml:",omitempty"`

	// Protocols should contain the protocols supported
	// by the server. Matching protocols are launched for
	// each peer.
	Protocols []Protocol `toml:"-"`

	// 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 `toml:",omitempty"`

	// If Dialer is set to a non-nil value, the given Dialer
	// is used to dial outbound peer connections.
	Dialer NodeDialer `toml:"-"`

	// If NoDial is true, the server will not dial any peers.
	NoDial bool `toml:",omitempty"`

	// If EnableMsgEvents is set then the server will emit PeerEvents
	// whenever a message is sent to or received from a peer
	EnableMsgEvents bool

	// Logger is a custom logger to use with the p2p.Server.
	Logger log.Logger `toml:",omitempty"`

Config holds Server options.

type DiscReason

type DiscReason uint
const (
	DiscRequested DiscReason = iota
	DiscSubprotocolError = 0x10

func (DiscReason) Error

func (d DiscReason) Error() string

func (DiscReason) String

func (d DiscReason) String() string

type GetMinorBlockHeaderListRequest

type GetMinorBlockHeaderListRequest struct {
	BlockHash common.Hash
	Branch    account.Branch
	Limit     uint32
	Direction uint8

GetMinorBlockHeaderListRequest get minor block header list request

type GetMinorBlockHeaderListResponse

type GetMinorBlockHeaderListResponse struct {
	RootTip         *types.RootBlockHeader
	ShardTip        *types.MinorBlockHeader
	BlockHeaderList []*types.MinorBlockHeader `bytesizeofslicelen:"4"`

GetMinorBlockHeaderListResponse get minor block header list response

type GetMinorBlockListRequest

type GetMinorBlockListRequest struct {
	MinorBlockHashList []common.Hash `bytesizeofslicelen:"4"`

GetMinorBlockListRequest get minor block list request

type GetMinorBlockListResponse

type GetMinorBlockListResponse struct {
	MinorBlockList []*types.MinorBlock `bytesizeofslicelen:"4"`

GetMinorBlockListResponse get minor block list response

type GetPeerListRequest

type GetPeerListRequest struct {
	MaxPeers uint32

GetPeerListRequest get peer list request

type GetPeerListResponse

type GetPeerListResponse struct {
	PeerInfoList []P2PeerInfo `bytesizeofslicelen:"4"`

GetPeerListResponse get peer list response

type GetRootBlockHeaderListRequest

type GetRootBlockHeaderListRequest struct {
	BlockHash common.Hash
	Limit     uint32
	Direction uint8

GetRootBlockHeaderListRequest get root block header list request

type GetRootBlockHeaderListResponse

type GetRootBlockHeaderListResponse struct {
	RootTip         *types.RootBlockHeader
	BlockHeaderList []*types.RootBlockHeader `bytesizeofslicelen:"4"`

GetRootBlockHeaderListResponse get root block header list response

type GetRootBlockListRequest

type GetRootBlockListRequest struct {
	RootBlockHashList []common.Hash `bytesizeofslicelen:"4"`

GetRootBlockListRequest get root block list request

type GetRootBlockListResponse

type GetRootBlockListResponse struct {
	RootBlockList []*types.RootBlock `bytesizeofslicelen:"4"`

GetRootBlockListResponse get root block list response

type HelloCmd

type HelloCmd struct {
	Version         uint32
	NetWorkID       uint32
	PeerID          common.Hash
	PeerIP          *serialize.Uint128
	PeerPort        uint16
	ChainMaskList   []uint32 `bytesizeofslicelen:"4"`
	RootBlockHeader *types.RootBlockHeader

HelloCmd hello cmd struct

type Metadata

type Metadata struct {
	Branch uint32

func (Metadata) Size

func (m Metadata) Size() int

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 MakeMsg

func MakeMsg(op P2PCommandOp, rpcID uint64, metadata Metadata, msg interface{}) (Msg, error)

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 {

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 NewBlockMinor

type NewBlockMinor struct {
	Block *types.MinorBlock

NewBlockMinor new block minor

type NewTransactionList

type NewTransactionList struct {
	TransactionList []*types.Transaction `bytesizeofslicelen:"4"`

NewTransactionList new transaction list

type NodeDialer

type NodeDialer interface {
	Dial(*enode.Node) (net.Conn, error)

NodeDialer is used to connect to nodes in the network, typically by using an underlying net.Dialer but also using net.Pipe in tests

type NodeInfo

type NodeInfo struct {
	ID    string `json:"id"`    // Unique node identifier (also the encryption key)
	Name  string `json:"name"`  // Name of the node, including client type, version, OS, custom data
	Enode string `json:"enode"` // Enode URL for adding this peer from remote peers
	ENR   string `json:"enr"`   // Ethereum Node Record
	IP    string `json:"ip"`    // IP address of the node
	Ports struct {
		Discovery int `json:"discovery"` // UDP listening port for discovery protocol
		Listener  int `json:"listener"`  // TCP listening port for RLPx
	} `json:"ports"`
	ListenAddr string                 `json:"listenAddr"`
	Protocols  map[string]interface{} `json:"protocols"`

NodeInfo represents a short summary of the information known about the host.

type P2PCommandOp

type P2PCommandOp byte
const (
	Hello P2PCommandOp = iota

p2p command

func (P2PCommandOp) String

func (p P2PCommandOp) String() string

type P2PeerInfo

type P2PeerInfo struct {
	IP   *serialize.Uint128
	Port uint16

P2PeerInfo peerInfo use uint123

type Peer

type Peer struct {
	// contains filtered or unexported fields

Peer represents a connected remote node.

func NewPeer

func NewPeer(id enode.ID, 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() enode.ID

ID returns the node's public key.

func (*Peer) Inbound

func (p *Peer) Inbound() bool

Inbound returns true if the peer is an inbound connection

func (*Peer) Info

func (p *Peer) Info() *PeerInfo

Info gathers and returns a collection of metadata known about a peer.

func (*Peer) LocalAddr

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

LocalAddr returns the local address of the network connection.

func (*Peer) Log

func (p *Peer) Log() log.Logger

func (*Peer) Name

func (p *Peer) Name() string

Name returns the node name that the remote node advertised.

func (*Peer) Node

func (p *Peer) Node() *enode.Node

Node returns the peer's node descriptor.

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 PeerEvent

type PeerEvent struct {
	Type     PeerEventType `json:"type"`
	Peer     enode.ID      `json:"peer"`
	Error    string        `json:"error,omitempty"`
	Protocol string        `json:"protocol,omitempty"`
	MsgCode  *uint64       `json:"msg_code,omitempty"`
	MsgSize  *uint32       `json:"msg_size,omitempty"`

PeerEvent is an event emitted when peers are either added or dropped from a p2p.Server or when a message is sent or received on a peer connection

type PeerEventType

type PeerEventType string

PeerEventType is the type of peer events emitted by a p2p.Server

const (
	// PeerEventTypeAdd is the type of event emitted when a peer is added
	// to a p2p.Server
	PeerEventTypeAdd PeerEventType = "add"

	// PeerEventTypeDrop is the type of event emitted when a peer is
	// dropped from a p2p.Server
	PeerEventTypeDrop PeerEventType = "drop"

	// PeerEventTypeMsgSend is the type of event emitted when a
	// message is successfully sent to a peer
	PeerEventTypeMsgSend PeerEventType = "msgsend"

	// PeerEventTypeMsgRecv is the type of event emitted when a
	// message is received from a peer
	PeerEventTypeMsgRecv PeerEventType = "msgrecv"

type PeerInfo

type PeerInfo struct {
	Enode   string   `json:"enode"` // Node URL
	ID      string   `json:"id"`    // Unique node identifier
	Name    string   `json:"name"`  // Name of the node, including client type, version, OS, custom data
	Caps    []string `json:"caps"`  // Protocols advertised by this peer
	Network struct {
		LocalAddress  string `json:"localAddress"`  // Local endpoint of the TCP data connection
		RemoteAddress string `json:"remoteAddress"` // Remote endpoint of the TCP data connection
		Inbound       bool   `json:"inbound"`
		Trusted       bool   `json:"trusted"`
		Static        bool   `json:"static"`
	} `json:"network"`
	Protocols map[string]interface{} `json:"protocols"` // Sub-protocol specific metadata fields

PeerInfo represents a short summary of the information known about a connected peer. Sub-protocol independent fields are contained and initialized here, with protocol specifics delegated to all connected sub-protocols.

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 goroutine 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

	// NodeInfo is an optional helper method to retrieve protocol specific metadata
	// about the host node.
	NodeInfo func() interface{}

	// PeerInfo is an optional helper method to retrieve protocol specific metadata
	// about a certain peer in the network. If an info retrieval function is set,
	// but returns nil, it is assumed that the protocol handshake is still running.
	PeerInfo func(id enode.ID) interface{}

	// Attributes contains protocol specific information for the node record.
	Attributes []enr.Entry

Protocol represents a P2P subprotocol implementation.

type QKCMsg

type QKCMsg struct {
	MetaData Metadata
	Op       P2PCommandOp
	RpcID    uint64
	Data     []byte

QKCMsg qkc msg struct

func DecodeQKCMsg

func DecodeQKCMsg(body []byte) (QKCMsg, error)

DecodeQKCMsg decode byte to qkcMsg

type Server

type Server struct {
	// Config fields may not be modified while the server is running.

	DiscV5 *discv5.Network
	// contains filtered or unexported fields

Server manages all peer connections.

func (*Server) AddPeer

func (srv *Server) AddPeer(node *enode.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) AddTrustedPeer

func (srv *Server) AddTrustedPeer(node *enode.Node)

AddTrustedPeer adds the given node to a reserved whitelist which allows the node to always connect, even if the slot are full.

func (*Server) NodeInfo

func (srv *Server) NodeInfo() *NodeInfo

NodeInfo gathers and returns a collection of metadata known about the host.

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) PeersInfo

func (srv *Server) PeersInfo() []*PeerInfo

PeersInfo returns an array of metadata objects describing connected peers.

func (*Server) RemovePeer

func (srv *Server) RemovePeer(node *enode.Node)

RemovePeer disconnects from the given node

func (*Server) RemoveTrustedPeer

func (srv *Server) RemoveTrustedPeer(node *enode.Node)

RemoveTrustedPeer removes the given node from the trusted peer set.

func (*Server) Self

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

Self returns the local node's endpoint information.

func (*Server) SetupConn

func (srv *Server) SetupConn(fd net.Conn, flags connFlag, dialDest *enode.Node) error

SetupConn runs the handshakes and attempts to add the connection as a peer. It returns when the connection has been added as a peer or the handshakes have failed.

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.

func (*Server) SubscribeEvents

func (srv *Server) SubscribeEvents(ch chan *PeerEvent) event.Subscription

SubscribePeers subscribes the given channel to peer events

type TCPDialer

type TCPDialer struct {

TCPDialer implements the NodeDialer interface by using a net.Dialer to create TCP connections to nodes in the network

func (TCPDialer) Dial

func (t TCPDialer) Dial(dest *enode.Node) (net.Conn, error)

Dial creates a TCP connection to the node

type Tip

type Tip struct {
	RootBlockHeader      *types.RootBlockHeader
	MinorBlockHeaderList []*types.MinorBlockHeader `bytesizeofslicelen:"4"`

Tip new minor block header list

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