132 lines
2.6 KiB
Go
132 lines
2.6 KiB
Go
package peer
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import (
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"fmt"
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"net"
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"time"
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"github.com/CityOfZion/neo-go/pkg/wire"
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"github.com/CityOfZion/neo-go/pkg/wire/payload"
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iputils "github.com/CityOfZion/neo-go/pkg/wire/util/ip"
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)
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// Handshake will initiate a handshake with this peer
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func (p *Peer) Handshake() error {
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handshakeErr := make(chan error, 1)
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go func() {
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if p.inbound {
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handshakeErr <- p.inboundHandShake()
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} else {
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handshakeErr <- p.outboundHandShake()
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}
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}()
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select {
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case err := <-handshakeErr:
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if err != nil {
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return err
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}
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case <-time.After(handshakeTimeout):
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return errHandShakeTimeout
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}
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// This is purely here for Logs
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if p.inbound {
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fmt.Println("inbound handshake with", p.RemoteAddr().String(), "successful")
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} else {
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fmt.Println("outbound handshake with", p.RemoteAddr().String(), "successful")
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}
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return nil
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}
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// If this peer has an inbound conn (conn that is going into another peer)
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// then he has dialed and so, we must read the version message
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func (p *Peer) inboundHandShake() error {
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var err error
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if err := p.writeLocalVersionMSG(); err != nil {
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return err
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}
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if err := p.readRemoteVersionMSG(); err != nil {
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return err
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}
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verack, err := payload.NewVerackMessage()
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if err != nil {
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return err
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}
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err = p.Write(verack)
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return p.readVerack()
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}
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func (p *Peer) outboundHandShake() error {
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var err error
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err = p.readRemoteVersionMSG()
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if err != nil {
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return err
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}
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err = p.writeLocalVersionMSG()
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if err != nil {
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return err
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}
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err = p.readVerack()
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if err != nil {
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return err
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}
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verack, err := payload.NewVerackMessage()
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if err != nil {
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return err
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}
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return p.Write(verack)
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}
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func (p *Peer) writeLocalVersionMSG() error {
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nonce := p.config.Nonce
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relay := p.config.Relay
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port := int(p.config.Port)
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ua := p.config.UserAgent
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sh := p.config.StartHeight()
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services := p.config.Services
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proto := p.config.ProtocolVer
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ip := iputils.GetLocalIP()
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tcpAddrMe := &net.TCPAddr{IP: ip, Port: port}
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messageVer, err := payload.NewVersionMessage(tcpAddrMe, sh, relay, proto, ua, nonce, services)
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if err != nil {
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return err
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}
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return p.Write(messageVer)
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}
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func (p *Peer) readRemoteVersionMSG() error {
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readmsg, err := wire.ReadMessage(p.conn, p.config.Net)
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if err != nil {
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return err
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}
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version, ok := readmsg.(*payload.VersionMessage)
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if !ok {
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return err
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}
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return p.OnVersion(version)
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}
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func (p *Peer) readVerack() error {
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readmsg, err := wire.ReadMessage(p.conn, p.config.Net)
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if err != nil {
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return err
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}
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_, ok := readmsg.(*payload.VerackMessage)
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if !ok {
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return err
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}
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// should only be accessed on one go-routine
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p.verackReceived = true
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return nil
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}
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