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https://github.com/ethereum/go-ethereum.git
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109 lines
3.5 KiB
Go
109 lines
3.5 KiB
Go
// Copyright 2023 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 light
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import (
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"github.com/ethereum/go-ethereum/beacon/light/types"
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"github.com/ethereum/go-ethereum/beacon/merkle"
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"github.com/ethereum/go-ethereum/beacon/params"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/rlp"
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)
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var checkpointKey = []byte("checkpoint-") // block root -> RLP(CheckpointData)
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type CheckpointData struct {
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Header types.Header
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CommitteeRoot common.Hash
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Committee *types.SerializedCommittee `rlp:"-"`
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CommitteeBranch merkle.Values
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}
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func (c *CheckpointData) Validate() bool {
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if c.CommitteeRoot != c.Committee.Root() {
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return false
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}
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expStateRoot, ok := merkle.VerifySingleProof(c.CommitteeBranch, params.BsiSyncCommittee, merkle.Value(c.CommitteeRoot))
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return ok && expStateRoot == c.Header.StateRoot
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}
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// expected to be validated already
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func (c *CheckpointData) InitChain(chain *CommitteeChain) {
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must := func(err error) {
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if err != nil {
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log.Crit("Error initializing committee chain with checkpoint", "error", err)
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}
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}
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period := c.Header.SyncPeriod()
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must(chain.DeleteFixedRootsFrom(period + 2))
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if chain.AddFixedRoot(period, c.CommitteeRoot) != nil {
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chain.Reset()
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must(chain.AddFixedRoot(period, c.CommitteeRoot))
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}
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must(chain.AddFixedRoot(period+1, common.Hash(c.CommitteeBranch[0])))
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must(chain.AddCommittee(period, c.Committee))
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}
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type CheckpointStore struct {
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chain *CommitteeChain
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db ethdb.KeyValueStore
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}
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func NewCheckpointStore(db ethdb.KeyValueStore, chain *CommitteeChain) *CheckpointStore {
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return &CheckpointStore{
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db: db,
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chain: chain,
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}
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}
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func getCheckpointKey(checkpoint common.Hash) []byte {
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var (
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kl = len(checkpointKey)
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key = make([]byte, kl+32)
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)
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copy(key[:kl], checkpointKey)
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copy(key[kl:], checkpoint[:])
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return key
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}
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func (cs *CheckpointStore) Get(checkpoint common.Hash) *CheckpointData {
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if enc, err := cs.db.Get(getCheckpointKey(checkpoint)); err == nil {
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c := new(CheckpointData)
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if err := rlp.DecodeBytes(enc, c); err != nil {
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log.Error("Error decoding stored checkpoint", "error", err)
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return nil
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}
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if committee := cs.chain.committees.get(c.Header.SyncPeriod()); committee != nil && committee.Root() == c.CommitteeRoot {
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c.Committee = committee
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return c
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}
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log.Error("Missing committee for stored checkpoint", "period", c.Header.SyncPeriod())
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}
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return nil
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}
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func (cs *CheckpointStore) Store(c *CheckpointData) {
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enc, err := rlp.EncodeToBytes(c)
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if err != nil {
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log.Error("Error encoding checkpoint for storage", "error", err)
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}
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if err := cs.db.Put(getCheckpointKey(c.Header.Hash()), enc); err != nil {
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log.Error("Error storing checkpoint in database", "error", err)
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}
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}
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