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