neoneo-go/pkg/network/payload/headers.go

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package payload
import (
"io"
"github.com/CityOfZion/neo-go/pkg/core"
"github.com/CityOfZion/neo-go/pkg/util"
log "github.com/sirupsen/logrus"
)
// Headers payload
type Headers struct {
Hdrs []*core.Header
}
// Users can at most request 2k header
const (
maxHeadersAllowed = 2000
)
// DecodeBinary implements the Payload interface.
func (p *Headers) DecodeBinary(r io.Reader) error {
br := util.BinReader{R: r}
lenHeaders := br.ReadVarUint()
if br.Err != nil {
return br.Err
}
// C# node does it silently
if lenHeaders > maxHeadersAllowed {
log.Warnf("received %d headers, capping to %d", lenHeaders, maxHeadersAllowed)
lenHeaders = maxHeadersAllowed
}
p.Hdrs = make([]*core.Header, lenHeaders)
for i := 0; i < int(lenHeaders); i++ {
header := &core.Header{}
if err := header.DecodeBinary(r); err != nil {
return err
}
p.Hdrs[i] = header
}
return nil
}
// EncodeBinary implements the Payload interface.
func (p *Headers) EncodeBinary(w io.Writer) error {
bw := util.BinWriter{W: w}
bw.WriteVarUint(uint64(len(p.Hdrs)))
if bw.Err != nil {
return bw.Err
}
for _, header := range p.Hdrs {
if err := header.EncodeBinary(w); err != nil {
return err
}
}
return nil
}