mirror of
https://github.com/ethereum/go-ethereum.git
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82 lines
2.5 KiB
Go
82 lines
2.5 KiB
Go
// Copyright 2024 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 stateless
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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/hexutil"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/rlp"
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)
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// ToExtWitness converts our internal witness representation to the consensus one.
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func (w *Witness) ToExtWitness() *ExtWitness {
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ext := &ExtWitness{
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Headers: w.Headers,
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}
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ext.Codes = make([]hexutil.Bytes, 0, len(w.Codes))
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for code := range w.Codes {
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ext.Codes = append(ext.Codes, []byte(code))
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}
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ext.State = make([]hexutil.Bytes, 0, len(w.State))
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for node := range w.State {
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ext.State = append(ext.State, []byte(node))
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}
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return ext
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}
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// FromExtWitness converts the consensus witness format into our internal one.
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func (w *Witness) FromExtWitness(ext *ExtWitness) error {
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if len(ext.Headers) == 0 {
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return errors.New("witness must contain at least one header")
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}
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w.Headers = ext.Headers
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w.Codes = make(map[string]struct{}, len(ext.Codes))
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for _, code := range ext.Codes {
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w.Codes[string(code)] = struct{}{}
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}
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w.State = make(map[string]struct{}, len(ext.State))
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for _, node := range ext.State {
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w.State[string(node)] = struct{}{}
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}
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return nil
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}
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// EncodeRLP serializes a witness as RLP.
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func (w *Witness) EncodeRLP(wr io.Writer) error {
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return rlp.Encode(wr, w.ToExtWitness())
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}
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// DecodeRLP decodes a witness from RLP.
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func (w *Witness) DecodeRLP(s *rlp.Stream) error {
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var ext ExtWitness
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if err := s.Decode(&ext); err != nil {
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return err
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}
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return w.FromExtWitness(&ext)
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}
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// ExtWitness is a witness RLP encoding for transferring across clients.
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type ExtWitness struct {
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Headers []*types.Header `json:"headers"`
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Codes []hexutil.Bytes `json:"codes"`
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State []hexutil.Bytes `json:"state"`
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Keys []hexutil.Bytes `json:"keys"`
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}
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