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302 lines
11 KiB
302 lines
11 KiB
package chain
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import (
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"encoding/binary"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/harmony-one/bls/ffi/go/bls"
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"github.com/harmony-one/harmony/block"
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"github.com/harmony-one/harmony/consensus/engine"
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"github.com/harmony-one/harmony/consensus/reward"
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"github.com/harmony-one/harmony/core/state"
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"github.com/harmony-one/harmony/core/types"
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"github.com/harmony-one/harmony/internal/ctxerror"
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"github.com/harmony-one/harmony/internal/utils"
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"github.com/harmony-one/harmony/shard"
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"github.com/harmony-one/harmony/shard/committee"
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staking "github.com/harmony-one/harmony/staking/types"
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"github.com/pkg/errors"
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"golang.org/x/crypto/sha3"
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)
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type engineImpl struct {
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d reward.Distributor
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}
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// Engine is an algorithm-agnostic consensus engine.
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var Engine = &engineImpl{nil}
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// Rewarder handles the distribution of block rewards
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func (e *engineImpl) Rewarder() reward.Distributor {
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return e.d
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}
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// SetRewarder ..
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func (e *engineImpl) SetRewarder(d reward.Distributor) {
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e.d = d
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}
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// SealHash returns the hash of a block prior to it being sealed.
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func (e *engineImpl) SealHash(header *block.Header) (hash common.Hash) {
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hasher := sha3.NewLegacyKeccak256()
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// TODO: update with new fields
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if err := rlp.Encode(hasher, []interface{}{
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header.ParentHash(),
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header.Coinbase(),
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header.Root(),
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header.TxHash(),
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header.ReceiptHash(),
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header.Bloom(),
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header.Number(),
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header.GasLimit(),
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header.GasUsed(),
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header.Time(),
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header.Extra(),
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}); err != nil {
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utils.Logger().Warn().Err(err).Msg("rlp.Encode failed")
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}
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hasher.Sum(hash[:0])
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return hash
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}
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// Seal is to seal final block.
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func (e *engineImpl) Seal(chain engine.ChainReader, block *types.Block, results chan<- *types.Block, stop <-chan struct{}) error {
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// TODO: implement final block sealing
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return nil
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}
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// Author returns the author of the block header.
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func (e *engineImpl) Author(header *block.Header) (common.Address, error) {
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// TODO: implement this
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return common.Address{}, nil
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}
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// Prepare is to prepare ...
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// TODO(RJ): fix it.
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func (e *engineImpl) Prepare(chain engine.ChainReader, header *block.Header) error {
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// TODO: implement prepare method
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return nil
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}
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// VerifyHeader checks whether a header conforms to the consensus rules of the bft engine.
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// Note that each block header contains the bls signature of the parent block
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func (e *engineImpl) VerifyHeader(chain engine.ChainReader, header *block.Header, seal bool) error {
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parentHeader := chain.GetHeader(header.ParentHash(), header.Number().Uint64()-1)
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if parentHeader == nil {
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return engine.ErrUnknownAncestor
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}
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if seal {
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if err := e.VerifySeal(chain, header); 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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// 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.
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func (e *engineImpl) VerifyHeaders(chain engine.ChainReader, headers []*block.Header, seals []bool) (chan<- struct{}, <-chan error) {
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abort, results := make(chan struct{}), 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 := e.VerifyHeader(chain, header, seals[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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// ReadPublicKeysFromLastBlock finds the public keys of last block's committee
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func ReadPublicKeysFromLastBlock(bc engine.ChainReader, header *block.Header) ([]*bls.PublicKey, error) {
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parentHeader := bc.GetHeaderByHash(header.ParentHash())
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return GetPublicKeys(bc, parentHeader, false)
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}
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// VerifySeal implements Engine, checking whether the given block's parent block satisfies
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// the PoS difficulty requirements, i.e. >= 2f+1 valid signatures from the committee
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// Note that each block header contains the bls signature of the parent block
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func (e *engineImpl) VerifySeal(chain engine.ChainReader, header *block.Header) error {
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if chain.CurrentHeader().Number().Uint64() <= uint64(1) {
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return nil
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}
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publicKeys, err := ReadPublicKeysFromLastBlock(chain, header)
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if err != nil {
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return ctxerror.New("[VerifySeal] Cannot retrieve publickeys from last block").WithCause(err)
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}
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sig := header.LastCommitSignature()
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payload := append(sig[:], header.LastCommitBitmap()...)
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aggSig, mask, err := ReadSignatureBitmapByPublicKeys(payload, publicKeys)
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if err != nil {
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return ctxerror.New("[VerifySeal] Unable to deserialize the LastCommitSignature and LastCommitBitmap in Block Header").WithCause(err)
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}
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parentHash := header.ParentHash()
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parentHeader := chain.GetHeader(parentHash, header.Number().Uint64()-1)
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parentQuorum, err := QuorumForBlock(chain, parentHeader, false)
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if err != nil {
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return errors.Wrapf(err,
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"cannot calculate quorum for block %s", header.Number())
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}
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if count := utils.CountOneBits(mask.Bitmap); count < int64(parentQuorum) {
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return ctxerror.New("[VerifySeal] Not enough signature in LastCommitSignature from Block Header",
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"need", parentQuorum, "got", count)
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}
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blockNumHash := make([]byte, 8)
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binary.LittleEndian.PutUint64(blockNumHash, header.Number().Uint64()-1)
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lastCommitPayload := append(blockNumHash, parentHash[:]...)
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if !aggSig.VerifyHash(mask.AggregatePublic, lastCommitPayload) {
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return ctxerror.New("[VerifySeal] Unable to verify aggregated signature from last block", "lastBlockNum", header.Number().Uint64()-1, "lastBlockHash", parentHash)
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}
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return nil
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}
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// Finalize implements Engine, accumulating the block rewards,
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// setting the final state and assembling the block.
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func (e *engineImpl) Finalize(
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chain engine.ChainReader, header *block.Header, state *state.DB, txs []*types.Transaction,
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receipts []*types.Receipt, outcxs []*types.CXReceipt,
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incxs []*types.CXReceiptsProof, stks []*staking.StakingTransaction) (*types.Block, error) {
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// Accumulate any block and uncle rewards and commit the final state root
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// Header seems complete, assemble into a block and return
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// TODO: Block rewards should be done only in beacon chain based on cross-links
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if err := AccumulateRewards(chain, state, header, e.Rewarder()); err != nil {
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return nil, ctxerror.New("cannot pay block reward").WithCause(err)
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}
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// Withdraw unlocked tokens to the delegators' accounts
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// Only do such at the last block of an epoch
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if len(header.ShardState()) > 0 {
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// TODO: make sure we are using the correct validator list
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validators := chain.ActiveValidatorAddresses()
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for _, validator := range validators {
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wrapper := state.GetStakingInfo(validator)
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if wrapper != nil {
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for i := range wrapper.Delegations {
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delegation := wrapper.Delegations[i]
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totalWithdraw := big.NewInt(0)
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count := 0
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for j := range delegation.Entries {
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if delegation.Entries[j].Epoch.Cmp(header.Epoch()) > 14 { // need to wait at least 14 epochs to withdraw;
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totalWithdraw.Add(totalWithdraw, delegation.Entries[j].Amount)
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count++
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} else {
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break
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}
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}
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state.AddBalance(delegation.DelegatorAddress, totalWithdraw)
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delegation.Entries = delegation.Entries[count:]
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}
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if err := state.UpdateStakingInfo(validator, wrapper); err != nil {
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return nil, ctxerror.New("failed update validator info").WithCause(err)
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}
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}
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}
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}
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header.SetRoot(state.IntermediateRoot(chain.Config().IsS3(header.Epoch())))
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return types.NewBlock(header, txs, receipts, outcxs, incxs, stks), nil
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}
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// QuorumForBlock returns the quorum for the given block header.
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func QuorumForBlock(chain engine.ChainReader, h *block.Header, reCalculate bool) (quorum int, err error) {
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var ss shard.State
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if reCalculate {
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ss, _ = committee.WithStakingEnabled.Compute(h.Epoch(), *chain.Config(), nil)
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} else {
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ss, err = chain.ReadShardState(h.Epoch())
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if err != nil {
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return 0, ctxerror.New("failed to read shard state of epoch",
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"epoch", h.Epoch().Uint64()).WithCause(err)
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}
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}
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c := ss.FindCommitteeByID(h.ShardID())
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if c == nil {
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return 0, errors.Errorf(
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"cannot find shard %d in shard state", h.ShardID())
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}
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return (len(c.NodeList))*2/3 + 1, nil
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}
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// Similiar to VerifyHeader, which is only for verifying the block headers of one's own chain, this verification
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// is used for verifying "incoming" block header against commit signature and bitmap sent from the other chain cross-shard via libp2p.
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// i.e. this header verification api is more flexible since the caller specifies which commit signature and bitmap to use
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// for verifying the block header, which is necessary for cross-shard block header verification. Example of such is cross-shard transaction.
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func (e *engineImpl) VerifyHeaderWithSignature(chain engine.ChainReader, header *block.Header, commitSig []byte, commitBitmap []byte, reCalculate bool) error {
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publicKeys, err := GetPublicKeys(chain, header, reCalculate)
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if err != nil {
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return ctxerror.New("[VerifyHeaderWithSignature] Cannot get publickeys for block header").WithCause(err)
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}
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payload := append(commitSig[:], commitBitmap[:]...)
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aggSig, mask, err := ReadSignatureBitmapByPublicKeys(payload, publicKeys)
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if err != nil {
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return ctxerror.New("[VerifyHeaderWithSignature] Unable to deserialize the commitSignature and commitBitmap in Block Header").WithCause(err)
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}
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hash := header.Hash()
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quorum, err := QuorumForBlock(chain, header, reCalculate)
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if err != nil {
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return errors.Wrapf(err,
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"cannot calculate quorum for block %s", header.Number())
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}
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if count := utils.CountOneBits(mask.Bitmap); count < int64(quorum) {
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return ctxerror.New("[VerifyHeaderWithSignature] Not enough signature in commitSignature from Block Header",
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"need", quorum, "got", count)
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}
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blockNumHash := make([]byte, 8)
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binary.LittleEndian.PutUint64(blockNumHash, header.Number().Uint64())
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commitPayload := append(blockNumHash, hash[:]...)
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if !aggSig.VerifyHash(mask.AggregatePublic, commitPayload) {
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return ctxerror.New("[VerifySeal] Unable to verify aggregated signature for block", "blockNum", header.Number().Uint64()-1, "blockHash", hash)
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}
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return nil
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}
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// GetPublicKeys finds the public keys of the committee that signed the block header
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func GetPublicKeys(chain engine.ChainReader, header *block.Header, reCalculate bool) ([]*bls.PublicKey, error) {
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var shardState shard.State
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var err error
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if reCalculate {
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shardState, _ = committee.WithStakingEnabled.Compute(header.Epoch(), *chain.Config(), nil)
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} else {
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shardState, err = chain.ReadShardState(header.Epoch())
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if err != nil {
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return nil, ctxerror.New("failed to read shard state of epoch",
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"epoch", header.Epoch().Uint64())
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}
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}
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committee := shardState.FindCommitteeByID(header.ShardID())
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if committee == nil {
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return nil, ctxerror.New("cannot find shard in the shard state",
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"blockNumber", header.Number(),
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"shardID", header.ShardID(),
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)
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}
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var committerKeys []*bls.PublicKey
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for _, member := range committee.NodeList {
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committerKey := new(bls.PublicKey)
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err := member.BlsPublicKey.ToLibBLSPublicKey(committerKey)
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if err != nil {
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return nil, ctxerror.New("cannot convert BLS public key",
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"blsPublicKey", member.BlsPublicKey).WithCause(err)
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}
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committerKeys = append(committerKeys, committerKey)
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}
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return committerKeys, nil
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}
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