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peerconn.go
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peerconn.go
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package p2p
import (
"bytes"
"crypto/ecdsa"
"encoding/binary"
"errors"
"fmt"
"github.com/xfs-network/xlibp2p/discover"
"github.com/xfs-network/xlibp2p/log"
"io/ioutil"
"net"
)
// Peer to peer connection session
type peerConn struct {
logger log.Logger
inbound bool
id discover.NodeId
self discover.NodeId
server *server
key *ecdsa.PrivateKey
rw net.Conn
version uint8
handshakeStatus int
flag int
}
func (c *peerConn) serve() {
// Get the address and port number of the client
fromAddr := c.rw.RemoteAddr()
inbound := c.flag & flagInbound != 0
if inbound {
if err := c.serverHandshake(); err != nil {
c.logger.Warnf("handshake error from %s: %v", fromAddr, err)
c.close()
return
}
} else {
if err := c.clientHandshake(); err != nil {
c.logger.Warnf("handshake error from %s: %v", fromAddr, err)
c.close()
return
}
}
c.logger.Infof("p2p handshake success by %s", fromAddr)
c.server.addpeer <- c
}
//Client handshake sending method
func (c *peerConn) clientHandshake() error {
// Whether the handshake status is based on handshake
if c.handshakeCompiled() {
return nil
}
request := &helloRequestMsg{
version: c.version,
id: c.self,
receiveId: c.id,
}
c.logger.Debugf("send hello request version: %d, id: %s, to receiveId: %s", c.version,c.self, c.id)
_, err := c.rw.Write(request.marshal())
if err != nil {
return err
}
hello, err := c.readHelloReRequestMsg()
if err != nil {
return err
}
c.logger.Debugf("receive hello request reply from node: %s, by version: %d", hello.id, c.version)
if hello.version != c.version {
return fmt.Errorf("handshake check err, got version: %d, want version: %d",
hello.version, c.version)
}
gotId := hello.receiveId
wantId := c.self
if !bytes.Equal(gotId[:], wantId[:]) {
return fmt.Errorf("handshake check err got my name: 0x%x, my real name: 0x%x",
gotId, wantId)
}
c.handshakeStatus = 1
return nil
}
// Service handshake response method
func (c *peerConn) serverHandshake() error {
// Whether the handshake status is based on handshake
if c.handshakeCompiled() {
return nil
}
// Read reply data
hello, err := c.readHelloRequestMsg()
if err != nil {
return err
}
c.logger.Debugf("receive handshake request by nodeId %s, version: %d",hello.id, hello.version)
if hello.version != c.version {
return fmt.Errorf("handshake check err, got version: %d, want version: %d",
hello.version, c.version)
}
gotId := hello.receiveId
wantId := c.self
if !bytes.Equal(gotId[:], wantId[:]) {
return fmt.Errorf("handshake check err got my name: 0x%x, my real name: 0x%x",
gotId, wantId)
}
c.id = hello.id
reply := &helloReRequestMsg{
id: c.self,
receiveId: hello.id,
version: c.version,
}
c.logger.Debugf("send handshake reply to nodeId %s", reply.receiveId)
if _, err = c.rw.Write(reply.marshal()); err != nil {
return err
}
return nil
}
// Read reply message
func (c *peerConn) readHelloReRequestMsg() (*helloReRequestMsg, error) {
msg, err := c.readMessage()
if err != nil {
return nil, err
}
if msg.Type() != typeReHelloRequest {
return nil, err
}
nMsg := new(helloReRequestMsg)
raw, _ := ioutil.ReadAll(msg.RawReader())
if !nMsg.unmarshal(raw) {
return nil, errors.New("parse hello request err")
}
return nMsg, nil
}
// Read peer session messages
func (c *peerConn) readHelloRequestMsg() (*helloRequestMsg, error) {
msg, err := c.readMessage()
if err != nil {
return nil, err
}
if msg.Type() != typeHelloRequest {
return nil, err
}
nMsg := new(helloRequestMsg)
raw, _ := ioutil.ReadAll(msg.RawReader())
if !nMsg.unmarshal(raw) {
return nil, errors.New("parse hello request err")
}
return nMsg, nil
}
// Write peer session messages
func (c *peerConn) writeMessage(mType uint8, data []byte) error {
cLen := len(data)
val := make([]byte, cLen+4)
binary.LittleEndian.PutUint32(val, uint32(cLen))
copy(val[4:], data)
msg := []byte{c.version, mType}
msg = append(msg, val...)
_, err := c.rw.Write(msg)
if err != nil {
return err
}
return nil
}
func (c *peerConn) readMessage() (MessageReader, error) {
return ReadMessage(c.rw)
}
func (c *peerConn) close() {
if err := c.rw.Close(); err != nil {
c.logger.Errorln(err)
}
}
func (c *peerConn) handshakeCompiled() bool {
return c.handshakeStatus == 1
}