neo-go/pkg/network/payload/version.go

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package payload
import (
"time"
"github.com/nspcc-dev/neo-go/pkg/config/netmode"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/network/capability"
)
// MaxUserAgentLength is the limit for user agent field.
const MaxUserAgentLength = 1024
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// Version payload.
type Version struct {
// NetMode of the node
Magic netmode.Magic
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// currently the version of the protocol is 0
Version uint32
// timestamp
Timestamp uint32
// it's used to distinguish the node from public IP
Nonce uint32
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// client id
UserAgent []byte
// List of available network services
Capabilities capability.Capabilities
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}
// NewVersion returns a pointer to a Version payload.
func NewVersion(magic netmode.Magic, id uint32, ua string, c []capability.Capability) *Version {
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return &Version{
Magic: magic,
Version: 0,
Timestamp: uint32(time.Now().UTC().Unix()),
Nonce: id,
UserAgent: []byte(ua),
Capabilities: c,
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}
}
// DecodeBinary implements Serializable interface.
func (p *Version) DecodeBinary(br *io.BinReader) {
p.Magic = netmode.Magic(br.ReadU32LE())
p.Version = br.ReadU32LE()
p.Timestamp = br.ReadU32LE()
p.Nonce = br.ReadU32LE()
p.UserAgent = br.ReadVarBytes(MaxUserAgentLength)
p.Capabilities.DecodeBinary(br)
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}
// EncodeBinary implements Serializable interface.
func (p *Version) EncodeBinary(bw *io.BinWriter) {
bw.WriteU32LE(uint32(p.Magic))
bw.WriteU32LE(p.Version)
bw.WriteU32LE(p.Timestamp)
bw.WriteU32LE(p.Nonce)
bw.WriteVarBytes(p.UserAgent)
p.Capabilities.EncodeBinary(bw)
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}