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

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package payload
import (
"errors"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/util"
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)
// Maximum inventory hashes number is limited to 500.
const (
MaxHashesCount = 500
)
// GetBlocks contains getblocks message payload fields.
type GetBlocks struct {
// Hash of the latest block that node requests.
HashStart util.Uint256
Count int16
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}
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// NewGetBlocks returns a pointer to a GetBlocks object.
func NewGetBlocks(start util.Uint256, count int16) *GetBlocks {
return &GetBlocks{
HashStart: start,
Count: count,
}
}
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// DecodeBinary implements Serializable interface.
func (p *GetBlocks) DecodeBinary(br *io.BinReader) {
p.HashStart.DecodeBinary(br)
p.Count = int16(br.ReadU16LE())
if p.Count < -1 || p.Count == 0 {
br.Err = errors.New("invalid count")
}
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}
// EncodeBinary implements Serializable interface.
func (p *GetBlocks) EncodeBinary(bw *io.BinWriter) {
p.HashStart.EncodeBinary(bw)
bw.WriteU16LE(uint16(p.Count))
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}