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

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package payload
import (
"errors"
"net"
"strconv"
"time"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/network/capability"
)
// MaxAddrsCount is the maximum number of addresses that could be packed into
// one payload.
const MaxAddrsCount = 200
// AddressAndTime payload.
type AddressAndTime struct {
Timestamp uint32
IP [16]byte
Capabilities capability.Capabilities
}
// NewAddressAndTime creates a new AddressAndTime object.
func NewAddressAndTime(e *net.TCPAddr, t time.Time, c capability.Capabilities) *AddressAndTime {
aat := AddressAndTime{
Timestamp: uint32(t.UTC().Unix()),
Capabilities: c,
}
copy(aat.IP[:], e.IP)
return &aat
}
// DecodeBinary implements Serializable interface.
func (p *AddressAndTime) DecodeBinary(br *io.BinReader) {
p.Timestamp = br.ReadU32LE()
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br.ReadBytes(p.IP[:])
p.Capabilities.DecodeBinary(br)
}
// EncodeBinary implements Serializable interface.
func (p *AddressAndTime) EncodeBinary(bw *io.BinWriter) {
bw.WriteU32LE(p.Timestamp)
bw.WriteBytes(p.IP[:])
p.Capabilities.EncodeBinary(bw)
}
// GetTCPAddress makes a string from IP and port specified in TCPCapability.
// It returns an error if there's no such capability.
func (p *AddressAndTime) GetTCPAddress() (string, error) {
var netip = make(net.IP, 16)
copy(netip, p.IP[:])
port := -1
for _, cap := range p.Capabilities {
if cap.Type == capability.TCPServer {
port = int(cap.Data.(*capability.Server).Port)
break
}
}
if port == -1 {
return "", errors.New("no TCP capability found")
}
return net.JoinHostPort(netip.String(), strconv.Itoa(port)), nil
}
// AddressList is a list with AddrAndTime.
type AddressList struct {
Addrs []*AddressAndTime
}
// NewAddressList creates a list for n AddressAndTime elements.
func NewAddressList(n int) *AddressList {
alist := AddressList{
Addrs: make([]*AddressAndTime, n),
}
return &alist
}
// DecodeBinary implements Serializable interface.
func (p *AddressList) DecodeBinary(br *io.BinReader) {
br.ReadArray(&p.Addrs, MaxAddrsCount)
if len(p.Addrs) == 0 {
br.Err = errors.New("no addresses listed")
}
}
// EncodeBinary implements Serializable interface.
func (p *AddressList) EncodeBinary(bw *io.BinWriter) {
bw.WriteArray(p.Addrs)
}