mirror of https://github.com/poanetwork/quorum.git
108 lines
3.5 KiB
Go
108 lines
3.5 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package types
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import (
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"errors"
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"io"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/rlp"
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)
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var (
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// IstanbulDigest represents a hash of "Istanbul practical byzantine fault tolerance"
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// to identify whether the block is from Istanbul consensus engine
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IstanbulDigest = common.HexToHash("0x63746963616c2062797a616e74696e65206661756c7420746f6c6572616e6365")
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IstanbulExtraVanity = 32 // Fixed number of extra-data bytes reserved for validator vanity
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IstanbulExtraSeal = 65 // Fixed number of extra-data bytes reserved for validator seal
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// ErrInvalidIstanbulHeaderExtra is returned if the length of extra-data is less than 32 bytes
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ErrInvalidIstanbulHeaderExtra = errors.New("invalid istanbul header extra-data")
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)
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type IstanbulExtra struct {
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Validators []common.Address
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Seal []byte
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CommittedSeal [][]byte
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}
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// EncodeRLP serializes ist into the Ethereum RLP format.
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func (ist *IstanbulExtra) EncodeRLP(w io.Writer) error {
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return rlp.Encode(w, []interface{}{
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ist.Validators,
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ist.Seal,
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ist.CommittedSeal,
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})
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}
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// DecodeRLP implements rlp.Decoder, and load the istanbul fields from a RLP stream.
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func (ist *IstanbulExtra) DecodeRLP(s *rlp.Stream) error {
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var istanbulExtra struct {
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Validators []common.Address
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Seal []byte
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CommittedSeal [][]byte
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}
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if err := s.Decode(&istanbulExtra); err != nil {
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return err
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}
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ist.Validators, ist.Seal, ist.CommittedSeal = istanbulExtra.Validators, istanbulExtra.Seal, istanbulExtra.CommittedSeal
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return nil
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}
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// ExtractIstanbulExtra extracts all values of the IstanbulExtra from the header. It returns an
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// error if the length of the given extra-data is less than 32 bytes or the extra-data can not
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// be decoded.
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func ExtractIstanbulExtra(h *Header) (*IstanbulExtra, error) {
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if len(h.Extra) < IstanbulExtraVanity {
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return nil, ErrInvalidIstanbulHeaderExtra
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}
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var istanbulExtra *IstanbulExtra
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err := rlp.DecodeBytes(h.Extra[IstanbulExtraVanity:], &istanbulExtra)
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if err != nil {
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return nil, err
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}
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return istanbulExtra, nil
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}
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// IstanbulFilteredHeader returns a filtered header which some information (like seal, committed seals)
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// are clean to fulfill the Istanbul hash rules. It returns nil if the extra-data cannot be
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// decoded/encoded by rlp.
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func IstanbulFilteredHeader(h *Header, keepSeal bool) *Header {
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newHeader := CopyHeader(h)
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istanbulExtra, err := ExtractIstanbulExtra(newHeader)
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if err != nil {
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return nil
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}
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if !keepSeal {
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istanbulExtra.Seal = []byte{}
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}
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istanbulExtra.CommittedSeal = [][]byte{}
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payload, err := rlp.EncodeToBytes(&istanbulExtra)
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if err != nil {
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return nil
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}
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newHeader.Extra = append(newHeader.Extra[:IstanbulExtraVanity], payload...)
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return newHeader
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}
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