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568 lines
18 KiB
568 lines
18 KiB
package consensus
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import (
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"math/big"
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"sync/atomic"
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"github.com/ethereum/go-ethereum/common"
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protobuf "github.com/golang/protobuf/proto"
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"github.com/harmony-one/bls/ffi/go/bls"
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msg_pb "github.com/harmony-one/harmony/api/proto/message"
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"github.com/harmony-one/harmony/block"
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consensus_engine "github.com/harmony-one/harmony/consensus/engine"
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"github.com/harmony-one/harmony/consensus/quorum"
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bls_cosi "github.com/harmony-one/harmony/crypto/bls"
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"github.com/harmony-one/harmony/crypto/hash"
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"github.com/harmony-one/harmony/internal/chain"
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"github.com/harmony-one/harmony/internal/utils"
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"github.com/harmony-one/harmony/multibls"
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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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"github.com/pkg/errors"
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"github.com/rs/zerolog"
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)
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// WaitForNewRandomness listens to the RndChannel to receive new VDF randomness.
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func (consensus *Consensus) WaitForNewRandomness() {
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go func() {
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for {
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vdfOutput := <-consensus.RndChannel
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consensus.pendingRnds = append(consensus.pendingRnds, vdfOutput)
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}
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}()
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}
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// GetNextRnd returns the oldest available randomness along with the hash of the block there randomness preimage is committed.
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func (consensus *Consensus) GetNextRnd() ([vdFAndProofSize]byte, [32]byte, error) {
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if len(consensus.pendingRnds) == 0 {
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return [vdFAndProofSize]byte{}, [32]byte{}, errors.New("No available randomness")
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}
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vdfOutput := consensus.pendingRnds[0]
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vdfBytes := [vdFAndProofSize]byte{}
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seed := [32]byte{}
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copy(vdfBytes[:], vdfOutput[:vdFAndProofSize])
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copy(seed[:], vdfOutput[vdFAndProofSize:])
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//pop the first vdfOutput from the list
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consensus.pendingRnds = consensus.pendingRnds[1:]
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return vdfBytes, seed, nil
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}
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var (
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empty = []byte{}
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)
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// Signs the consensus message and returns the marshaled message.
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func (consensus *Consensus) signAndMarshalConsensusMessage(message *msg_pb.Message,
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priKey *bls.SecretKey) ([]byte, error) {
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if err := consensus.signConsensusMessage(message, priKey); err != nil {
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return empty, err
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}
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marshaledMessage, err := protobuf.Marshal(message)
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if err != nil {
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return empty, err
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}
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return marshaledMessage, nil
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}
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// GetViewID returns the consensus ID
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func (consensus *Consensus) GetViewID() uint64 {
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return consensus.viewID
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}
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// UpdatePublicKeys updates the PublicKeys for
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// quorum on current subcommittee, protected by a mutex
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func (consensus *Consensus) UpdatePublicKeys(pubKeys []*bls.PublicKey) int64 {
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consensus.pubKeyLock.Lock()
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consensus.Decider.UpdateParticipants(pubKeys)
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utils.Logger().Info().Msg("My Committee updated")
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for i := range pubKeys {
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utils.Logger().Debug().
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Int("index", i).
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Str("BLSPubKey", pubKeys[i].SerializeToHexStr()).
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Msg("Member")
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}
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consensus.LeaderPubKey = pubKeys[0]
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utils.Logger().Info().
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Str("info", consensus.LeaderPubKey.SerializeToHexStr()).Msg("My Leader")
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consensus.pubKeyLock.Unlock()
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// reset states after update public keys
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consensus.ResetState()
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consensus.ResetViewChangeState()
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return consensus.Decider.ParticipantsCount()
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}
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// NewFaker returns a faker consensus.
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func NewFaker() *Consensus {
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return &Consensus{}
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}
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// Sign on the hash of the message
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func (consensus *Consensus) signMessage(message []byte, priKey *bls.SecretKey) []byte {
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hash := hash.Keccak256(message)
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signature := priKey.SignHash(hash[:])
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return signature.Serialize()
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}
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// Sign on the consensus message signature field.
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func (consensus *Consensus) signConsensusMessage(message *msg_pb.Message,
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priKey *bls.SecretKey) error {
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message.Signature = nil
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// TODO: use custom serialization method rather than protobuf
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marshaledMessage, err := protobuf.Marshal(message)
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if err != nil {
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return err
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}
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// 64 byte of signature on previous data
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signature := consensus.signMessage(marshaledMessage, priKey)
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message.Signature = signature
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return nil
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}
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// GetViewIDSigsArray returns the signatures for viewID in viewchange
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func (consensus *Consensus) GetViewIDSigsArray(viewID uint64) []*bls.Sign {
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sigs := []*bls.Sign{}
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for _, sig := range consensus.viewIDSigs[viewID] {
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sigs = append(sigs, sig)
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}
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return sigs
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}
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// GetNilSigsArray returns the signatures for nil prepared message in viewchange
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func (consensus *Consensus) GetNilSigsArray(viewID uint64) []*bls.Sign {
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sigs := []*bls.Sign{}
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for _, sig := range consensus.nilSigs[viewID] {
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sigs = append(sigs, sig)
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}
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return sigs
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}
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// ResetState resets the state of the consensus
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func (consensus *Consensus) ResetState() {
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consensus.getLogger().Debug().
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Str("Phase", consensus.phase.String()).
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Msg("[ResetState] Resetting consensus state")
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consensus.switchPhase(FBFTAnnounce, true)
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consensus.blockHash = [32]byte{}
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consensus.blockHeader = []byte{}
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consensus.block = []byte{}
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consensus.Decider.ResetPrepareAndCommitVotes()
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members := consensus.Decider.Participants()
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prepareBitmap, _ := bls_cosi.NewMask(members, nil)
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commitBitmap, _ := bls_cosi.NewMask(members, nil)
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consensus.prepareBitmap = prepareBitmap
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consensus.commitBitmap = commitBitmap
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consensus.aggregatedPrepareSig = nil
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consensus.aggregatedCommitSig = nil
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}
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// ToggleConsensusCheck flip the flag of whether ignore viewID check during consensus process
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func (consensus *Consensus) ToggleConsensusCheck() {
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if consensus.ignoreViewIDCheck.IsSet() {
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consensus.ignoreViewIDCheck.UnSet()
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} else {
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consensus.ignoreViewIDCheck.Set()
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}
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}
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// IsValidatorInCommittee returns whether the given validator BLS address is part of my committee
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func (consensus *Consensus) IsValidatorInCommittee(pubKey *bls.PublicKey) bool {
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pubKeyBytes := shard.FromLibBLSPublicKeyUnsafe(pubKey)
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if pubKeyBytes == nil {
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return false
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}
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return consensus.Decider.IndexOf(*pubKeyBytes) != -1
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}
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// IsValidatorInCommitteeBytes returns whether the given validator BLS address is part of my committee
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func (consensus *Consensus) IsValidatorInCommitteeBytes(pubKey shard.BLSPublicKey) bool {
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return consensus.Decider.IndexOf(pubKey) != -1
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}
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// Verify the signature of the message are valid from the signer's public key.
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func verifyMessageSig(signerPubKey *bls.PublicKey, message *msg_pb.Message) error {
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signature := message.Signature
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message.Signature = nil
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messageBytes, err := protobuf.Marshal(message)
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if err != nil {
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return err
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}
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msgSig := bls.Sign{}
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err = msgSig.Deserialize(signature)
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if err != nil {
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return err
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}
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msgHash := hash.Keccak256(messageBytes)
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if !msgSig.VerifyHash(signerPubKey, msgHash[:]) {
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return errors.New("failed to verify the signature")
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}
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message.Signature = signature
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return nil
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}
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// verifySenderKey verifys the message senderKey is properly signed and senderAddr is valid
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func (consensus *Consensus) verifySenderKey(msg *msg_pb.Message) error {
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senderKey := shard.BLSPublicKey{}
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copy(senderKey[:], msg.GetConsensus().SenderPubkey[:])
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if !consensus.IsValidatorInCommitteeBytes(senderKey) {
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return shard.ErrValidNotInCommittee
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}
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return nil
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}
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func (consensus *Consensus) verifyViewChangeSenderKey(msg *msg_pb.Message) (*bls.PublicKey, error) {
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vcMsg := msg.GetViewchange()
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senderKey, err := bls_cosi.BytesToBLSPublicKey(vcMsg.SenderPubkey)
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if err != nil {
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return nil, err
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}
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if !consensus.IsValidatorInCommittee(senderKey) {
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return nil, shard.ErrValidNotInCommittee
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}
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return senderKey, nil
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}
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// SetViewID set the viewID to the height of the blockchain
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func (consensus *Consensus) SetViewID(height uint64) {
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consensus.viewID = height
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consensus.current.viewID = height
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}
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// SetMode sets the mode of consensus
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func (consensus *Consensus) SetMode(m Mode) {
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consensus.current.SetMode(m)
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}
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// Mode returns the mode of consensus
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func (consensus *Consensus) Mode() Mode {
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return consensus.current.Mode()
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}
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// RegisterPRndChannel registers the channel for receiving randomness preimage from DRG protocol
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func (consensus *Consensus) RegisterPRndChannel(pRndChannel chan []byte) {
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consensus.PRndChannel = pRndChannel
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}
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// RegisterRndChannel registers the channel for receiving final randomness from DRG protocol
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func (consensus *Consensus) RegisterRndChannel(rndChannel chan [548]byte) {
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consensus.RndChannel = rndChannel
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}
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// Check viewID, caller's responsibility to hold lock when change ignoreViewIDCheck
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func (consensus *Consensus) checkViewID(msg *FBFTMessage) error {
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// just ignore consensus check for the first time when node join
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if consensus.ignoreViewIDCheck.IsSet() {
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//in syncing mode, node accepts incoming messages without viewID/leaderKey checking
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//so only set mode to normal when new node enters consensus and need checking viewID
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consensus.current.SetMode(Normal)
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consensus.viewID = msg.ViewID
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consensus.current.SetViewID(msg.ViewID)
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consensus.LeaderPubKey = msg.SenderPubkey
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consensus.ignoreViewIDCheck.UnSet()
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consensus.consensusTimeout[timeoutConsensus].Start()
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utils.Logger().Debug().
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Uint64("viewID", consensus.viewID).
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Str("leaderKey", consensus.LeaderPubKey.SerializeToHexStr()[:20]).
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Msg("viewID and leaderKey override")
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utils.Logger().Debug().
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Uint64("viewID", consensus.viewID).
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Uint64("block", consensus.blockNum).
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Msg("Start consensus timer")
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return nil
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} else if msg.ViewID > consensus.viewID {
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return consensus_engine.ErrViewIDNotMatch
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} else if msg.ViewID < consensus.viewID {
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return errors.New("view ID belongs to the past")
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}
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return nil
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}
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// SetBlockNum sets the blockNum in consensus object, called at node bootstrap
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func (consensus *Consensus) SetBlockNum(blockNum uint64) {
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atomic.StoreUint64(&consensus.blockNum, blockNum)
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}
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// ReadSignatureBitmapPayload read the payload for signature and bitmap; offset is the beginning position of reading
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func (consensus *Consensus) ReadSignatureBitmapPayload(
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recvPayload []byte, offset int,
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) (*bls.Sign, *bls_cosi.Mask, error) {
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if offset+shard.BLSSignatureSizeInBytes > len(recvPayload) {
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return nil, nil, errors.New("payload not have enough length")
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}
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sigAndBitmapPayload := recvPayload[offset:]
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return chain.ReadSignatureBitmapByPublicKeys(
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sigAndBitmapPayload, consensus.Decider.Participants(),
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)
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}
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// getLogger returns logger for consensus contexts added
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func (consensus *Consensus) getLogger() *zerolog.Logger {
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logger := utils.Logger().With().
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Uint64("myBlock", consensus.blockNum).
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Uint64("myViewID", consensus.viewID).
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Interface("phase", consensus.phase).
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Str("mode", consensus.current.Mode().String()).
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Logger()
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return &logger
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}
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// retrieve corresponding blsPublicKey from Coinbase Address
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func (consensus *Consensus) getLeaderPubKeyFromCoinbase(
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header *block.Header,
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) (*bls.PublicKey, error) {
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shardState, err := consensus.ChainReader.ReadShardState(header.Epoch())
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if err != nil {
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return nil, errors.Wrapf(err, "cannot read shard state %v %s",
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header.Epoch(),
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header.Coinbase().Hash().Hex(),
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)
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}
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committee, err := shardState.FindCommitteeByID(header.ShardID())
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if err != nil {
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return nil, err
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}
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committerKey := new(bls.PublicKey)
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isStaking := consensus.ChainReader.Config().IsStaking(header.Epoch())
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for _, member := range committee.Slots {
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if isStaking {
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// After staking the coinbase address will be the address of bls public key
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if utils.GetAddressFromBLSPubKeyBytes(member.BLSPublicKey[:]) == header.Coinbase() {
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if err := member.BLSPublicKey.ToLibBLSPublicKey(committerKey); err != nil {
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return nil, err
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}
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return committerKey, nil
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}
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} else {
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if member.EcdsaAddress == header.Coinbase() {
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if err := member.BLSPublicKey.ToLibBLSPublicKey(committerKey); err != nil {
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return nil, err
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}
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return committerKey, nil
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}
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}
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}
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return nil, errors.Errorf(
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"cannot find corresponding BLS Public Key coinbase %s",
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header.Coinbase().Hex(),
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)
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}
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// UpdateConsensusInformation will update shard information (epoch, publicKeys, blockNum, viewID)
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// based on the local blockchain. It is called in two cases for now:
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// 1. consensus object initialization. because of current dependency where chainreader is only available
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// after node is initialized; node is only available after consensus is initialized
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// we need call this function separately after create consensus object
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// 2. after state syncing is finished
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// It will return the mode:
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// (a) node not in committed: Listening mode
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// (b) node in committed but has any err during processing: Syncing mode
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// (c) node in committed and everything looks good: Normal mode
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func (consensus *Consensus) UpdateConsensusInformation() Mode {
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curHeader := consensus.ChainReader.CurrentHeader()
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curEpoch := curHeader.Epoch()
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nextEpoch := new(big.Int).Add(curHeader.Epoch(), common.Big1)
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// Overwrite nextEpoch if the shard state has a epoch number
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if len(curHeader.ShardState()) > 0 {
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nextShardState, err := curHeader.GetShardState()
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if err != nil {
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return Syncing
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}
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if nextShardState.Epoch != nil {
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nextEpoch = nextShardState.Epoch
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}
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}
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isFirstTimeStaking := consensus.ChainReader.Config().IsStaking(nextEpoch) &&
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len(curHeader.ShardState()) > 0 &&
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!consensus.ChainReader.Config().IsStaking(curEpoch)
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haventUpdatedDecider := consensus.ChainReader.Config().IsStaking(curEpoch) &&
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consensus.Decider.Policy() != quorum.SuperMajorityStake
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// Only happens once, the flip-over to a new Decider policy
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if isFirstTimeStaking || haventUpdatedDecider {
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decider := quorum.NewDecider(quorum.SuperMajorityStake, consensus.ShardID)
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decider.SetMyPublicKeyProvider(func() (*multibls.PublicKey, error) {
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return consensus.PubKey, nil
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})
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consensus.Decider = decider
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}
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var committeeToSet *shard.Committee
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epochToSet := curEpoch
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hasError := false
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curShardState, err := committee.WithStakingEnabled.ReadFromDB(
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curEpoch, consensus.ChainReader,
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)
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if err != nil {
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utils.Logger().Error().
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Err(err).
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Uint32("shard", consensus.ShardID).
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Msg("[UpdateConsensusInformation] Error retrieving current shard state")
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return Syncing
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}
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consensus.getLogger().Info().Msg("[UpdateConsensusInformation] Updating.....")
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// genesis block is a special case that will have shard state and needs to skip processing
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isNotGenesisBlock := curHeader.Number().Cmp(big.NewInt(0)) > 0
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if len(curHeader.ShardState()) > 0 && isNotGenesisBlock {
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nextShardState, err := committee.WithStakingEnabled.ReadFromDB(
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nextEpoch, consensus.ChainReader,
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)
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if err != nil {
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utils.Logger().Error().
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Err(err).
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Uint32("shard", consensus.ShardID).
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Msg("Error retrieving nextEpoch shard state")
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return Syncing
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}
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subComm, err := nextShardState.FindCommitteeByID(curHeader.ShardID())
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if err != nil {
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utils.Logger().Error().
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Err(err).
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Uint32("shard", consensus.ShardID).
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Msg("Error retrieving nextEpoch shard state")
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return Syncing
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}
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committeeToSet = subComm
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epochToSet = nextEpoch
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} else {
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subComm, err := curShardState.FindCommitteeByID(curHeader.ShardID())
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if err != nil {
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utils.Logger().Error().
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Err(err).
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Uint32("shard", consensus.ShardID).
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Msg("Error retrieving current shard state")
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return Syncing
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}
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committeeToSet = subComm
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}
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if len(committeeToSet.Slots) == 0 {
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consensus.getLogger().Warn().
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Msg("[UpdateConsensusInformation] No members in the committee to update")
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hasError = true
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}
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// update public keys in the committee
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oldLeader := consensus.LeaderPubKey
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pubKeys, _ := committeeToSet.BLSPublicKeys()
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consensus.getLogger().Info().
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Int("numPubKeys", len(pubKeys)).
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Msg("[UpdateConsensusInformation] Successfully updated public keys")
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consensus.UpdatePublicKeys(pubKeys)
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// Update voters in the committee
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if _, err := consensus.Decider.SetVoters(
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committeeToSet, epochToSet,
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); err != nil {
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utils.Logger().Error().
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Err(err).
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Uint32("shard", consensus.ShardID).
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Msg("Error when updating voters")
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return Syncing
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}
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utils.Logger().Info().
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Uint64("block-number", curHeader.Number().Uint64()).
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Uint64("curEpoch", curHeader.Epoch().Uint64()).
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Uint32("shard-id", consensus.ShardID).
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Msg("[UpdateConsensusInformation] changing committee")
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// take care of possible leader change during the epoch
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if len(curHeader.ShardState()) == 0 && curHeader.Number().Uint64() != 0 {
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leaderPubKey, err := consensus.getLeaderPubKeyFromCoinbase(curHeader)
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|
if err != nil || leaderPubKey == nil {
|
|
consensus.getLogger().Debug().Err(err).
|
|
Msg("[UpdateConsensusInformation] Unable to get leaderPubKey from coinbase")
|
|
consensus.ignoreViewIDCheck.Set()
|
|
hasError = true
|
|
} else {
|
|
consensus.getLogger().Debug().
|
|
Str("leaderPubKey", leaderPubKey.SerializeToHexStr()).
|
|
Msg("[UpdateConsensusInformation] Most Recent LeaderPubKey Updated Based on BlockChain")
|
|
consensus.LeaderPubKey = leaderPubKey
|
|
}
|
|
}
|
|
|
|
for _, key := range pubKeys {
|
|
// in committee
|
|
if consensus.PubKey.Contains(key) {
|
|
if hasError {
|
|
return Syncing
|
|
}
|
|
|
|
// If the leader changed and I myself become the leader
|
|
if !consensus.LeaderPubKey.IsEqual(oldLeader) && consensus.IsLeader() {
|
|
go func() {
|
|
utils.Logger().Debug().
|
|
Str("myKey", consensus.PubKey.SerializeToHexStr()).
|
|
Uint64("viewID", consensus.viewID).
|
|
Uint64("block", consensus.blockNum).
|
|
Msg("[UpdateConsensusInformation] I am the New Leader")
|
|
consensus.ReadySignal <- struct{}{}
|
|
}()
|
|
}
|
|
return Normal
|
|
}
|
|
}
|
|
// not in committee
|
|
return Listening
|
|
}
|
|
|
|
// IsLeader check if the node is a leader or not by comparing the public key of
|
|
// the node with the leader public key
|
|
func (consensus *Consensus) IsLeader() bool {
|
|
for _, key := range consensus.PubKey.PublicKey {
|
|
if key.IsEqual(consensus.LeaderPubKey) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// NeedsRandomNumberGeneration returns true if the current epoch needs random number generation
|
|
func (consensus *Consensus) NeedsRandomNumberGeneration(epoch *big.Int) bool {
|
|
if consensus.ShardID == 0 && epoch.Uint64() >= shard.Schedule.RandomnessStartingEpoch() {
|
|
return true
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func (consensus *Consensus) addViewIDKeyIfNotExist(viewID uint64) {
|
|
members := consensus.Decider.Participants()
|
|
if _, ok := consensus.bhpSigs[viewID]; !ok {
|
|
consensus.bhpSigs[viewID] = map[string]*bls.Sign{}
|
|
}
|
|
if _, ok := consensus.nilSigs[viewID]; !ok {
|
|
consensus.nilSigs[viewID] = map[string]*bls.Sign{}
|
|
}
|
|
if _, ok := consensus.viewIDSigs[viewID]; !ok {
|
|
consensus.viewIDSigs[viewID] = map[string]*bls.Sign{}
|
|
}
|
|
if _, ok := consensus.bhpBitmap[viewID]; !ok {
|
|
bhpBitmap, _ := bls_cosi.NewMask(members, nil)
|
|
consensus.bhpBitmap[viewID] = bhpBitmap
|
|
}
|
|
if _, ok := consensus.nilBitmap[viewID]; !ok {
|
|
nilBitmap, _ := bls_cosi.NewMask(members, nil)
|
|
consensus.nilBitmap[viewID] = nilBitmap
|
|
}
|
|
if _, ok := consensus.viewIDBitmap[viewID]; !ok {
|
|
viewIDBitmap, _ := bls_cosi.NewMask(members, nil)
|
|
consensus.viewIDBitmap[viewID] = viewIDBitmap
|
|
}
|
|
}
|
|
|