pkg: hide it by moving to _pkg.dev

The idea here is to preserve the history of `dev` branch development and its
code when merging with the `master`. Later this code could be moved into the
masters code where appropriate.

_pkg.dev/wire/payload/mversion.go

@@ -0,0 +1,93 @@
+// Copied and Modified for NEO from: https://github.com/decred/dcrd/blob/master/wire/VersionMessage.go
+
+package payload
+
+import (
+	"errors"
+	"io"
+	"net"
+	"time"
+
+	"github.com/CityOfZion/neo-go/pkg/wire/command"
+	"github.com/CityOfZion/neo-go/pkg/wire/protocol"
+	"github.com/CityOfZion/neo-go/pkg/wire/util"
+)
+
+const minMsgVersionSize = 28
+
+var errInvalidNetAddr = errors.New("provided net.Addr is not a net.TCPAddr")
+
+//VersionMessage represents a version message on the neo-network
+type VersionMessage struct {
+	Version     protocol.Version
+	Timestamp   uint32
+	Services    protocol.ServiceFlag
+	IP          net.IP
+	Port        uint16
+	Nonce       uint32
+	UserAgent   []byte
+	StartHeight uint32
+	Relay       bool
+}
+
+//NewVersionMessage will return a VersionMessage object
+func NewVersionMessage(addr net.Addr, startHeight uint32, relay bool, pver protocol.Version, userAgent string, nonce uint32, services protocol.ServiceFlag) (*VersionMessage, error) {
+
+	tcpAddr, ok := addr.(*net.TCPAddr)
+	if !ok {
+		return nil, errInvalidNetAddr
+	}
+
+	version := &VersionMessage{
+		pver,
+		uint32(time.Now().Unix()),
+		services,
+		tcpAddr.IP,
+		uint16(tcpAddr.Port),
+		nonce,
+		[]byte(userAgent),
+		startHeight,
+		relay,
+	}
+	return version, nil
+}
+
+// DecodePayload Implements Messager interface
+func (v *VersionMessage) DecodePayload(r io.Reader) error {
+	br := &util.BinReader{R: r}
+	br.Read(&v.Version)
+	br.Read(&v.Services)
+	br.Read(&v.Timestamp)
+	br.Read(&v.Port) // Port is not BigEndian as stated in the docs
+	br.Read(&v.Nonce)
+
+	var lenUA uint8
+	br.Read(&lenUA)
+
+	v.UserAgent = make([]byte, lenUA)
+	br.Read(&v.UserAgent)
+	br.Read(&v.StartHeight)
+	br.Read(&v.Relay)
+	return br.Err
+}
+
+// EncodePayload Implements messager interface
+func (v *VersionMessage) EncodePayload(w io.Writer) error {
+	bw := &util.BinWriter{W: w}
+
+	bw.Write(v.Version)
+	bw.Write(v.Services)
+	bw.Write(v.Timestamp)
+	bw.Write(v.Port) // Not big End
+	bw.Write(v.Nonce)
+	bw.Write(uint8(len(v.UserAgent)))
+	bw.Write(v.UserAgent)
+	bw.Write(v.StartHeight)
+	bw.Write(v.Relay)
+	return bw.Err
+}
+
+// Command Implements messager interface
+func (v *VersionMessage) Command() command.Type {
+	return command.Version
+}