mirror of https://github.com/poanetwork/quorum.git
741 lines
24 KiB
Go
741 lines
24 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 backend
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import (
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"bytes"
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"errors"
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"math/big"
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"math/rand"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/consensus"
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"github.com/ethereum/go-ethereum/consensus/istanbul"
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"github.com/ethereum/go-ethereum/consensus/istanbul/validator"
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istanbulCore "github.com/ethereum/go-ethereum/consensus/istanbul/core"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/crypto/sha3"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/rpc"
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lru "github.com/hashicorp/golang-lru"
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)
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const (
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checkpointInterval = 1024 // Number of blocks after which to save the vote snapshot to the database
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inmemorySnapshots = 128 // Number of recent vote snapshots to keep in memory
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inmemoryPeers = 40
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inmemoryMessages = 1024
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)
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var (
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// errInvalidProposal is returned when a prposal is malformed.
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errInvalidProposal = errors.New("invalid proposal")
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// errInvalidSignature is returned when given signature is not signed by given
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// address.
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errInvalidSignature = errors.New("invalid signature")
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// errUnknownBlock is returned when the list of validators is requested for a block
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// that is not part of the local blockchain.
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errUnknownBlock = errors.New("unknown block")
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// errUnauthorized is returned if a header is signed by a non authorized entity.
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errUnauthorized = errors.New("unauthorized")
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// errInvalidDifficulty is returned if the difficulty of a block is not 1
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errInvalidDifficulty = errors.New("invalid difficulty")
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// errInvalidExtraDataFormat is returned when the extra data format is incorrect
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errInvalidExtraDataFormat = errors.New("invalid extra data format")
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// errInvalidMixDigest is returned if a block's mix digest is not Istanbul digest.
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errInvalidMixDigest = errors.New("invalid Istanbul mix digest")
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// errInvalidNonce is returned if a block's nonce is invalid
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errInvalidNonce = errors.New("invalid nonce")
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// errInvalidUncleHash is returned if a block contains an non-empty uncle list.
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errInvalidUncleHash = errors.New("non empty uncle hash")
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// errInconsistentValidatorSet is returned if the validator set is inconsistent
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errInconsistentValidatorSet = errors.New("non empty uncle hash")
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// errInvalidTimestamp is returned if the timestamp of a block is lower than the previous block's timestamp + the minimum block period.
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errInvalidTimestamp = errors.New("invalid timestamp")
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// errInvalidVotingChain is returned if an authorization list is attempted to
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// be modified via out-of-range or non-contiguous headers.
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errInvalidVotingChain = errors.New("invalid voting chain")
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// errInvalidVote is returned if a nonce value is something else that the two
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// allowed constants of 0x00..0 or 0xff..f.
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errInvalidVote = errors.New("vote nonce not 0x00..0 or 0xff..f")
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// errInvalidCommittedSeals is returned if the committed seal is not signed by any of parent validators.
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errInvalidCommittedSeals = errors.New("invalid committed seals")
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// errEmptyCommittedSeals is returned if the field of committed seals is zero.
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errEmptyCommittedSeals = errors.New("zero committed seals")
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// errMismatchTxhashes is returned if the TxHash in header is mismatch.
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errMismatchTxhashes = errors.New("mismatch transcations hashes")
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)
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var (
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defaultDifficulty = big.NewInt(1)
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nilUncleHash = types.CalcUncleHash(nil) // Always Keccak256(RLP([])) as uncles are meaningless outside of PoW.
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emptyNonce = types.BlockNonce{}
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now = time.Now
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nonceAuthVote = hexutil.MustDecode("0xffffffffffffffff") // Magic nonce number to vote on adding a new validator
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nonceDropVote = hexutil.MustDecode("0x0000000000000000") // Magic nonce number to vote on removing a validator.
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inmemoryAddresses = 20 // Number of recent addresses from ecrecover
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recentAddresses, _ = lru.NewARC(inmemoryAddresses)
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)
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// Author retrieves the Ethereum address of the account that minted the given
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// block, which may be different from the header's coinbase if a consensus
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// engine is based on signatures.
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func (sb *backend) Author(header *types.Header) (common.Address, error) {
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return ecrecover(header)
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}
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// Signers extracts all the addresses who have signed the given header
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// It will extract for each seal who signed it, regardless of if the seal is
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// repeated
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func (sb *backend) Signers(header *types.Header) ([]common.Address, error) {
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extra, err := types.ExtractIstanbulExtra(header)
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if err != nil {
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return []common.Address{}, err
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}
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var addrs []common.Address
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proposalSeal := istanbulCore.PrepareCommittedSeal(header.Hash())
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// 1. Get committed seals from current header
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for _, seal := range extra.CommittedSeal {
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// 2. Get the original address by seal and parent block hash
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addr, err := istanbul.GetSignatureAddress(proposalSeal, seal)
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if err != nil {
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sb.logger.Error("not a valid address", "err", err)
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return nil, errInvalidSignature
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}
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addrs = append(addrs, addr)
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}
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return addrs, nil
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}
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// VerifyHeader checks whether a header conforms to the consensus rules of a
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// given engine. Verifying the seal may be done optionally here, or explicitly
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// via the VerifySeal method.
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func (sb *backend) VerifyHeader(chain consensus.ChainReader, header *types.Header, seal bool) error {
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return sb.verifyHeader(chain, header, nil)
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}
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// verifyHeader checks whether a header conforms to the consensus rules.The
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// caller may optionally pass in a batch of parents (ascending order) to avoid
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// looking those up from the database. This is useful for concurrently verifying
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// a batch of new headers.
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func (sb *backend) verifyHeader(chain consensus.ChainReader, header *types.Header, parents []*types.Header) error {
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if header.Number == nil {
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return errUnknownBlock
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}
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// Don't waste time checking blocks from the future
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if header.Time.Cmp(big.NewInt(now().Unix())) > 0 {
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return consensus.ErrFutureBlock
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}
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// Ensure that the extra data format is satisfied
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if _, err := types.ExtractIstanbulExtra(header); err != nil {
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return errInvalidExtraDataFormat
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}
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// Ensure that the coinbase is valid
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if header.Nonce != (emptyNonce) && !bytes.Equal(header.Nonce[:], nonceAuthVote) && !bytes.Equal(header.Nonce[:], nonceDropVote) {
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return errInvalidNonce
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}
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// Ensure that the mix digest is zero as we don't have fork protection currently
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if header.MixDigest != types.IstanbulDigest {
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return errInvalidMixDigest
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}
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// Ensure that the block doesn't contain any uncles which are meaningless in Istanbul
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if header.UncleHash != nilUncleHash {
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return errInvalidUncleHash
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}
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// Ensure that the block's difficulty is meaningful (may not be correct at this point)
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if header.Difficulty == nil || header.Difficulty.Cmp(defaultDifficulty) != 0 {
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return errInvalidDifficulty
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}
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return sb.verifyCascadingFields(chain, header, parents)
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}
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// verifyCascadingFields verifies all the header fields that are not standalone,
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// rather depend on a batch of previous headers. The caller may optionally pass
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// in a batch of parents (ascending order) to avoid looking those up from the
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// database. This is useful for concurrently verifying a batch of new headers.
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func (sb *backend) verifyCascadingFields(chain consensus.ChainReader, header *types.Header, parents []*types.Header) error {
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// The genesis block is the always valid dead-end
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number := header.Number.Uint64()
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if number == 0 {
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return nil
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}
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// Ensure that the block's timestamp isn't too close to it's parent
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var parent *types.Header
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if len(parents) > 0 {
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parent = parents[len(parents)-1]
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} else {
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parent = chain.GetHeader(header.ParentHash, number-1)
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}
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if parent == nil || parent.Number.Uint64() != number-1 || parent.Hash() != header.ParentHash {
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return consensus.ErrUnknownAncestor
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}
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if parent.Time.Uint64()+sb.config.BlockPeriod > header.Time.Uint64() {
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return errInvalidTimestamp
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}
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// Verify validators in extraData. Validators in snapshot and extraData should be the same.
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snap, err := sb.snapshot(chain, number-1, header.ParentHash, parents)
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if err != nil {
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return err
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}
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validators := make([]byte, len(snap.validators())*common.AddressLength)
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for i, validator := range snap.validators() {
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copy(validators[i*common.AddressLength:], validator[:])
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}
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if err := sb.verifySigner(chain, header, parents); err != nil {
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return err
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}
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return sb.verifyCommittedSeals(chain, header, parents)
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}
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// VerifyHeaders is similar to VerifyHeader, but verifies a batch of headers
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// concurrently. The method returns a quit channel to abort the operations and
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// a results channel to retrieve the async verifications (the order is that of
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// the input slice).
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func (sb *backend) VerifyHeaders(chain consensus.ChainReader, headers []*types.Header, seals []bool) (chan<- struct{}, <-chan error) {
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abort := make(chan struct{})
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results := make(chan error, len(headers))
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go func() {
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for i, header := range headers {
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err := sb.verifyHeader(chain, header, headers[:i])
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select {
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case <-abort:
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return
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case results <- err:
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}
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}
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}()
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return abort, results
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}
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// VerifyUncles verifies that the given block's uncles conform to the consensus
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// rules of a given engine.
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func (sb *backend) VerifyUncles(chain consensus.ChainReader, block *types.Block) error {
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if len(block.Uncles()) > 0 {
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return errInvalidUncleHash
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}
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return nil
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}
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// verifySigner checks whether the signer is in parent's validator set
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func (sb *backend) verifySigner(chain consensus.ChainReader, header *types.Header, parents []*types.Header) error {
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// Verifying the genesis block is not supported
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number := header.Number.Uint64()
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if number == 0 {
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return errUnknownBlock
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}
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// Retrieve the snapshot needed to verify this header and cache it
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snap, err := sb.snapshot(chain, number-1, header.ParentHash, parents)
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if err != nil {
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return err
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}
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// resolve the authorization key and check against signers
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signer, err := ecrecover(header)
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if err != nil {
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return err
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}
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// Signer should be in the validator set of previous block's extraData.
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if _, v := snap.ValSet.GetByAddress(signer); v == nil {
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return errUnauthorized
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}
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return nil
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}
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// verifyCommittedSeals checks whether every committed seal is signed by one of the parent's validators
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func (sb *backend) verifyCommittedSeals(chain consensus.ChainReader, header *types.Header, parents []*types.Header) error {
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number := header.Number.Uint64()
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// We don't need to verify committed seals in the genesis block
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if number == 0 {
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return nil
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}
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// Retrieve the snapshot needed to verify this header and cache it
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snap, err := sb.snapshot(chain, number-1, header.ParentHash, parents)
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if err != nil {
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return err
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}
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extra, err := types.ExtractIstanbulExtra(header)
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if err != nil {
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return err
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}
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// The length of Committed seals should be larger than 0
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if len(extra.CommittedSeal) == 0 {
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return errEmptyCommittedSeals
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}
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validators := snap.ValSet.Copy()
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// Check whether the committed seals are generated by parent's validators
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validSeal := 0
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committers, err := sb.Signers(header)
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if err != nil {
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return err
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}
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for _, addr := range committers {
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if validators.RemoveValidator(addr) {
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validSeal++
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continue
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}
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return errInvalidCommittedSeals
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}
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// The length of validSeal should be larger than number of faulty node + 1
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if validSeal <= snap.ValSet.F() {
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return errInvalidCommittedSeals
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}
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return nil
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}
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// VerifySeal checks whether the crypto seal on a header is valid according to
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// the consensus rules of the given engine.
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func (sb *backend) VerifySeal(chain consensus.ChainReader, header *types.Header) error {
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// get parent header and ensure the signer is in parent's validator set
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number := header.Number.Uint64()
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if number == 0 {
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return errUnknownBlock
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}
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// ensure that the difficulty equals to defaultDifficulty
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if header.Difficulty.Cmp(defaultDifficulty) != 0 {
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return errInvalidDifficulty
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}
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return sb.verifySigner(chain, header, nil)
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}
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// Prepare initializes the consensus fields of a block header according to the
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// rules of a particular engine. The changes are executed inline.
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func (sb *backend) Prepare(chain consensus.ChainReader, header *types.Header) error {
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// unused fields, force to set to empty
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header.Coinbase = common.Address{}
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header.Nonce = emptyNonce
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header.MixDigest = types.IstanbulDigest
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// copy the parent extra data as the header extra data
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number := header.Number.Uint64()
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parent := chain.GetHeader(header.ParentHash, number-1)
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if parent == nil {
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return consensus.ErrUnknownAncestor
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}
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// use the same difficulty for all blocks
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header.Difficulty = defaultDifficulty
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// Assemble the voting snapshot
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snap, err := sb.snapshot(chain, number-1, header.ParentHash, nil)
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if err != nil {
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return err
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}
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// get valid candidate list
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sb.candidatesLock.RLock()
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var addresses []common.Address
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var authorizes []bool
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for address, authorize := range sb.candidates {
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if snap.checkVote(address, authorize) {
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addresses = append(addresses, address)
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authorizes = append(authorizes, authorize)
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}
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}
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sb.candidatesLock.RUnlock()
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// pick one of the candidates randomly
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if len(addresses) > 0 {
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index := rand.Intn(len(addresses))
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// add validator voting in coinbase
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header.Coinbase = addresses[index]
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if authorizes[index] {
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copy(header.Nonce[:], nonceAuthVote)
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} else {
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copy(header.Nonce[:], nonceDropVote)
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}
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}
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// add validators in snapshot to extraData's validators section
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extra, err := prepareExtra(header, snap.validators())
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if err != nil {
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return err
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}
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header.Extra = extra
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// set header's timestamp
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header.Time = new(big.Int).Add(parent.Time, new(big.Int).SetUint64(sb.config.BlockPeriod))
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if header.Time.Int64() < time.Now().Unix() {
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header.Time = big.NewInt(time.Now().Unix())
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}
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return nil
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}
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// Finalize runs any post-transaction state modifications (e.g. block rewards)
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// and assembles the final block.
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//
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// Note, the block header and state database might be updated to reflect any
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// consensus rules that happen at finalization (e.g. block rewards).
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func (sb *backend) Finalize(chain consensus.ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction,
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uncles []*types.Header, receipts []*types.Receipt) (*types.Block, error) {
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// No block rewards in Istanbul, so the state remains as is and uncles are dropped
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header.Root = state.IntermediateRoot(chain.Config().IsEIP158(header.Number))
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header.UncleHash = nilUncleHash
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// Assemble and return the final block for sealing
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return types.NewBlock(header, txs, nil, receipts), nil
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}
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// Seal generates a new block for the given input block with the local miner's
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// seal place on top.
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func (sb *backend) Seal(chain consensus.ChainReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error {
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// update the block header timestamp and signature and propose the block to core engine
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header := block.Header()
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number := header.Number.Uint64()
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// Bail out if we're unauthorized to sign a block
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snap, err := sb.snapshot(chain, number-1, header.ParentHash, nil)
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if err != nil {
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return err
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}
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if _, v := snap.ValSet.GetByAddress(sb.address); v == nil {
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return errUnauthorized
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}
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parent := chain.GetHeader(header.ParentHash, number-1)
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if parent == nil {
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return consensus.ErrUnknownAncestor
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}
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block, err = sb.updateBlock(parent, block)
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if err != nil {
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return err
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}
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delay := time.Unix(header.Time.Int64(), 0).Sub(now())
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go func() {
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// wait for the timestamp of header, use this to adjust the block period
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select {
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case <-time.After(delay):
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case <-stop:
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results <- nil
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return
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}
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// get the proposed block hash and clear it if the seal() is completed.
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sb.sealMu.Lock()
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sb.proposedBlockHash = block.Hash()
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defer func() {
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sb.proposedBlockHash = common.Hash{}
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sb.sealMu.Unlock()
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}()
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// post block into Istanbul engine
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go sb.EventMux().Post(istanbul.RequestEvent{
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Proposal: block,
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})
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for {
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select {
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case result := <-sb.commitCh:
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// if the block hash and the hash from channel are the same,
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// return the result. Otherwise, keep waiting the next hash.
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if result != nil && block.Hash() == result.Hash() {
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results <- result
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return
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}
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case <-stop:
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results <- nil
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return
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}
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}
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}()
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return nil
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}
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// update timestamp and signature of the block based on its number of transactions
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func (sb *backend) updateBlock(parent *types.Header, block *types.Block) (*types.Block, error) {
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header := block.Header()
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// sign the hash
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seal, err := sb.Sign(sigHash(header).Bytes())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
err = writeSeal(header, seal)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return block.WithSeal(header), nil
|
|
}
|
|
|
|
// APIs returns the RPC APIs this consensus engine provides.
|
|
func (sb *backend) APIs(chain consensus.ChainReader) []rpc.API {
|
|
return []rpc.API{{
|
|
Namespace: "istanbul",
|
|
Version: "1.0",
|
|
Service: &API{chain: chain, istanbul: sb},
|
|
Public: true,
|
|
}}
|
|
}
|
|
|
|
// Start implements consensus.Istanbul.Start
|
|
func (sb *backend) Start(chain consensus.ChainReader, currentBlock func() *types.Block, hasBadBlock func(hash common.Hash) bool) error {
|
|
sb.coreMu.Lock()
|
|
defer sb.coreMu.Unlock()
|
|
if sb.coreStarted {
|
|
return istanbul.ErrStartedEngine
|
|
}
|
|
|
|
// clear previous data
|
|
sb.proposedBlockHash = common.Hash{}
|
|
if sb.commitCh != nil {
|
|
close(sb.commitCh)
|
|
}
|
|
sb.commitCh = make(chan *types.Block, 1)
|
|
|
|
sb.chain = chain
|
|
sb.currentBlock = currentBlock
|
|
sb.hasBadBlock = hasBadBlock
|
|
|
|
if err := sb.core.Start(); err != nil {
|
|
return err
|
|
}
|
|
|
|
sb.coreStarted = true
|
|
return nil
|
|
}
|
|
|
|
// Stop implements consensus.Istanbul.Stop
|
|
func (sb *backend) Stop() error {
|
|
sb.coreMu.Lock()
|
|
defer sb.coreMu.Unlock()
|
|
if !sb.coreStarted {
|
|
return istanbul.ErrStoppedEngine
|
|
}
|
|
if err := sb.core.Stop(); err != nil {
|
|
return err
|
|
}
|
|
sb.coreStarted = false
|
|
return nil
|
|
}
|
|
|
|
// snapshot retrieves the authorization snapshot at a given point in time.
|
|
func (sb *backend) snapshot(chain consensus.ChainReader, number uint64, hash common.Hash, parents []*types.Header) (*Snapshot, error) {
|
|
// Search for a snapshot in memory or on disk for checkpoints
|
|
var (
|
|
headers []*types.Header
|
|
snap *Snapshot
|
|
)
|
|
for snap == nil {
|
|
// If an in-memory snapshot was found, use that
|
|
if s, ok := sb.recents.Get(hash); ok {
|
|
snap = s.(*Snapshot)
|
|
break
|
|
}
|
|
// If an on-disk checkpoint snapshot can be found, use that
|
|
if number%checkpointInterval == 0 {
|
|
if s, err := loadSnapshot(sb.config.Epoch, sb.db, hash); err == nil {
|
|
log.Trace("Loaded voting snapshot form disk", "number", number, "hash", hash)
|
|
snap = s
|
|
break
|
|
}
|
|
}
|
|
// If we're at block zero, make a snapshot
|
|
if number == 0 {
|
|
genesis := chain.GetHeaderByNumber(0)
|
|
if err := sb.VerifyHeader(chain, genesis, false); err != nil {
|
|
return nil, err
|
|
}
|
|
istanbulExtra, err := types.ExtractIstanbulExtra(genesis)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
snap = newSnapshot(sb.config.Epoch, 0, genesis.Hash(), validator.NewSet(istanbulExtra.Validators, sb.config.ProposerPolicy))
|
|
if err := snap.store(sb.db); err != nil {
|
|
return nil, err
|
|
}
|
|
log.Trace("Stored genesis voting snapshot to disk")
|
|
break
|
|
}
|
|
// No snapshot for this header, gather the header and move backward
|
|
var header *types.Header
|
|
if len(parents) > 0 {
|
|
// If we have explicit parents, pick from there (enforced)
|
|
header = parents[len(parents)-1]
|
|
if header.Hash() != hash || header.Number.Uint64() != number {
|
|
return nil, consensus.ErrUnknownAncestor
|
|
}
|
|
parents = parents[:len(parents)-1]
|
|
} else {
|
|
// No explicit parents (or no more left), reach out to the database
|
|
header = chain.GetHeader(hash, number)
|
|
if header == nil {
|
|
return nil, consensus.ErrUnknownAncestor
|
|
}
|
|
}
|
|
headers = append(headers, header)
|
|
number, hash = number-1, header.ParentHash
|
|
}
|
|
// Previous snapshot found, apply any pending headers on top of it
|
|
for i := 0; i < len(headers)/2; i++ {
|
|
headers[i], headers[len(headers)-1-i] = headers[len(headers)-1-i], headers[i]
|
|
}
|
|
snap, err := snap.apply(headers)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
sb.recents.Add(snap.Hash, snap)
|
|
|
|
// If we've generated a new checkpoint snapshot, save to disk
|
|
if snap.Number%checkpointInterval == 0 && len(headers) > 0 {
|
|
if err = snap.store(sb.db); err != nil {
|
|
return nil, err
|
|
}
|
|
log.Trace("Stored voting snapshot to disk", "number", snap.Number, "hash", snap.Hash)
|
|
}
|
|
return snap, err
|
|
}
|
|
|
|
// FIXME: Need to update this for Istanbul
|
|
// sigHash returns the hash which is used as input for the Istanbul
|
|
// signing. It is the hash of the entire header apart from the 65 byte signature
|
|
// contained at the end of the extra data.
|
|
//
|
|
// Note, the method requires the extra data to be at least 65 bytes, otherwise it
|
|
// panics. This is done to avoid accidentally using both forms (signature present
|
|
// or not), which could be abused to produce different hashes for the same header.
|
|
func sigHash(header *types.Header) (hash common.Hash) {
|
|
hasher := sha3.NewKeccak256()
|
|
|
|
// Clean seal is required for calculating proposer seal.
|
|
rlp.Encode(hasher, types.IstanbulFilteredHeader(header, false))
|
|
hasher.Sum(hash[:0])
|
|
return hash
|
|
}
|
|
|
|
// SealHash returns the hash of a block prior to it being sealed.
|
|
func (sb *backend) SealHash(header *types.Header) common.Hash {
|
|
return sigHash(header)
|
|
}
|
|
|
|
// ecrecover extracts the Ethereum account address from a signed header.
|
|
func ecrecover(header *types.Header) (common.Address, error) {
|
|
hash := header.Hash()
|
|
if addr, ok := recentAddresses.Get(hash); ok {
|
|
return addr.(common.Address), nil
|
|
}
|
|
|
|
// Retrieve the signature from the header extra-data
|
|
istanbulExtra, err := types.ExtractIstanbulExtra(header)
|
|
if err != nil {
|
|
return common.Address{}, err
|
|
}
|
|
|
|
addr, err := istanbul.GetSignatureAddress(sigHash(header).Bytes(), istanbulExtra.Seal)
|
|
if err != nil {
|
|
return addr, err
|
|
}
|
|
recentAddresses.Add(hash, addr)
|
|
return addr, nil
|
|
}
|
|
|
|
// prepareExtra returns a extra-data of the given header and validators
|
|
func prepareExtra(header *types.Header, vals []common.Address) ([]byte, error) {
|
|
var buf bytes.Buffer
|
|
|
|
// compensate the lack bytes if header.Extra is not enough IstanbulExtraVanity bytes.
|
|
if len(header.Extra) < types.IstanbulExtraVanity {
|
|
header.Extra = append(header.Extra, bytes.Repeat([]byte{0x00}, types.IstanbulExtraVanity-len(header.Extra))...)
|
|
}
|
|
buf.Write(header.Extra[:types.IstanbulExtraVanity])
|
|
|
|
ist := &types.IstanbulExtra{
|
|
Validators: vals,
|
|
Seal: []byte{},
|
|
CommittedSeal: [][]byte{},
|
|
}
|
|
|
|
payload, err := rlp.EncodeToBytes(&ist)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return append(buf.Bytes(), payload...), nil
|
|
}
|
|
|
|
// writeSeal writes the extra-data field of the given header with the given seals.
|
|
// suggest to rename to writeSeal.
|
|
func writeSeal(h *types.Header, seal []byte) error {
|
|
if len(seal)%types.IstanbulExtraSeal != 0 {
|
|
return errInvalidSignature
|
|
}
|
|
|
|
istanbulExtra, err := types.ExtractIstanbulExtra(h)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
istanbulExtra.Seal = seal
|
|
payload, err := rlp.EncodeToBytes(&istanbulExtra)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
h.Extra = append(h.Extra[:types.IstanbulExtraVanity], payload...)
|
|
return nil
|
|
}
|
|
|
|
// writeCommittedSeals writes the extra-data field of a block header with given committed seals.
|
|
func writeCommittedSeals(h *types.Header, committedSeals [][]byte) error {
|
|
if len(committedSeals) == 0 {
|
|
return errInvalidCommittedSeals
|
|
}
|
|
|
|
for _, seal := range committedSeals {
|
|
if len(seal) != types.IstanbulExtraSeal {
|
|
return errInvalidCommittedSeals
|
|
}
|
|
}
|
|
|
|
istanbulExtra, err := types.ExtractIstanbulExtra(h)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
istanbulExtra.CommittedSeal = make([][]byte, len(committedSeals))
|
|
copy(istanbulExtra.CommittedSeal, committedSeals)
|
|
|
|
payload, err := rlp.EncodeToBytes(&istanbulExtra)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
h.Extra = append(h.Extra[:types.IstanbulExtraVanity], payload...)
|
|
return nil
|
|
}
|