98 lines
2.5 KiB
Go
98 lines
2.5 KiB
Go
package payload
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import (
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"encoding/binary"
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)
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const (
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minVersionSize = 27
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)
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// Version payload.
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type Version struct {
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// currently the version of the protocol is 0
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Version uint32
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// currently 1
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Services uint64
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// timestamp
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Timestamp uint32
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// port this server is listening on
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Port uint16
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// it's used to distinguish the node from public IP
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Nonce uint32
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// client id
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UserAgent []byte
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// Height of the block chain
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StartHeight uint32
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// Whether to receive and forward
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Relay bool
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}
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// NewVersion returns a pointer to a Version payload.
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func NewVersion(id uint32, p uint16, ua string, h uint32, r bool) *Version {
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return &Version{
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Version: 0,
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Services: 1,
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Timestamp: 12345,
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Port: p,
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Nonce: id,
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UserAgent: []byte(ua),
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StartHeight: 0,
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Relay: r,
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}
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}
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// UnmarshalBinary implements the Payloader interface.
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func (p *Version) UnmarshalBinary(b []byte) error {
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// Length of the user agent should be calculated dynamicaly.
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// There is no information about the size or format of this.
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// the only thing we know is by looking at the #c source code.
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// /NEO:{0}/ => /NEO:2.6.0/
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lenUA := len(b) - minVersionSize
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p.Version = binary.LittleEndian.Uint32(b[0:4])
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p.Services = binary.LittleEndian.Uint64(b[4:12])
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p.Timestamp = binary.LittleEndian.Uint32(b[12:16])
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// FIXME: port's byteorder should be big endian according to the docs.
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// but when connecting to the privnet docker image it's little endian.
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p.Port = binary.LittleEndian.Uint16(b[16:18])
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p.Nonce = binary.LittleEndian.Uint32(b[18:22])
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p.UserAgent = b[22 : 22+lenUA]
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curlen := 22 + lenUA
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p.StartHeight = binary.LittleEndian.Uint32(b[curlen : curlen+4])
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p.Relay = b[len(b)-1 : len(b)][0] == 1
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return nil
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}
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// MarshalBinary implements the Payloader interface.
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func (p *Version) MarshalBinary() ([]byte, error) {
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b := make([]byte, p.Size())
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binary.LittleEndian.PutUint32(b[0:4], p.Version)
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binary.LittleEndian.PutUint64(b[4:12], p.Services)
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binary.LittleEndian.PutUint32(b[12:16], p.Timestamp)
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// FIXME: byte order (little / big)?
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binary.LittleEndian.PutUint16(b[16:18], p.Port)
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binary.LittleEndian.PutUint32(b[18:22], p.Nonce)
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copy(b[22:22+len(p.UserAgent)], p.UserAgent) //
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curLen := 22 + len(p.UserAgent)
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binary.LittleEndian.PutUint32(b[curLen:curLen+4], p.StartHeight)
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// yikes
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var bln []byte
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if p.Relay {
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bln = []byte{1}
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} else {
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bln = []byte{0}
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}
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copy(b[curLen+4:len(b)], bln)
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return b, nil
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}
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// Size implements the payloader interface.
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func (p *Version) Size() uint32 {
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return uint32(minVersionSize + len(p.UserAgent))
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}
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