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352 lines
8.2 KiB
352 lines
8.2 KiB
package quorum
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/harmony-one/bls/ffi/go/bls"
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"github.com/harmony-one/harmony/consensus/votepower"
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bls_cosi "github.com/harmony-one/harmony/crypto/bls"
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"github.com/harmony-one/harmony/multibls"
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"github.com/harmony-one/harmony/numeric"
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"github.com/harmony-one/harmony/shard"
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"github.com/pkg/errors"
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)
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// Phase is a phase that needs quorum to proceed
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type Phase byte
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const (
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// Prepare ..
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Prepare Phase = iota
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// Commit ..
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Commit
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// ViewChange ..
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ViewChange
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)
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var (
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phaseNames = map[Phase]string{
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Prepare: "Prepare",
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Commit: "Commit",
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ViewChange: "viewChange",
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}
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errPhaseUnknown = errors.New("invariant of known phase violated")
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)
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func (p Phase) String() string {
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if name, ok := phaseNames[p]; ok {
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return name
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}
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return fmt.Sprintf("Unknown Quorum Phase %+v", byte(p))
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}
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// Policy is the rule we used to decide is quorum achieved
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type Policy byte
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const (
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// SuperMajorityVote is a 2/3s voting mechanism, pre-PoS
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SuperMajorityVote Policy = iota
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// SuperMajorityStake is 2/3s of total staked amount for epoch
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SuperMajorityStake
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)
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var policyNames = map[Policy]string{
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SuperMajorityStake: "SuperMajorityStake",
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SuperMajorityVote: "SuperMajorityVote",
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}
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func (p Policy) String() string {
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if name, ok := policyNames[p]; ok {
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return name
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}
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return fmt.Sprintf("Unknown Quorum Policy %+v", byte(p))
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}
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// ParticipantTracker ..
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type ParticipantTracker interface {
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Participants() []*bls.PublicKey
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IndexOf(*bls.PublicKey) int
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ParticipantsCount() int64
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NextAfter(*bls.PublicKey) (bool, *bls.PublicKey)
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UpdateParticipants(pubKeys []*bls.PublicKey)
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}
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// SignatoryTracker ..
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type SignatoryTracker interface {
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ParticipantTracker
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SubmitVote(
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p Phase, PubKey *bls.PublicKey,
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sig *bls.Sign, headerHash common.Hash,
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height, viewID uint64,
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) (*votepower.Ballot, error)
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// Caller assumes concurrency protection
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SignersCount(Phase) int64
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reset([]Phase)
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}
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// SignatureReader ..
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type SignatureReader interface {
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SignatoryTracker
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ReadAllBallots(Phase) []*votepower.Ballot
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ReadBallot(p Phase, PubKey *bls.PublicKey) *votepower.Ballot
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TwoThirdsSignersCount() int64
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// 96 bytes aggregated signature
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AggregateVotes(p Phase) *bls.Sign
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}
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// DependencyInjectionWriter ..
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type DependencyInjectionWriter interface {
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SetMyPublicKeyProvider(func() (*multibls.PublicKey, error))
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}
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// DependencyInjectionReader ..
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type DependencyInjectionReader interface {
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MyPublicKey() func() (*multibls.PublicKey, error)
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}
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// Decider ..
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type Decider interface {
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fmt.Stringer
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SignatureReader
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DependencyInjectionWriter
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SetVoters(subCommittee *shard.Committee, epoch *big.Int) (*TallyResult, error)
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Policy() Policy
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IsQuorumAchieved(Phase) bool
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IsQuorumAchievedByMask(mask *bls_cosi.Mask) bool
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QuorumThreshold() numeric.Dec
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AmIMemberOfCommitee() bool
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IsRewardThresholdAchieved() bool
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ResetPrepareAndCommitVotes()
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ResetViewChangeVotes()
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}
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// Registry ..
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type Registry struct {
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Deciders map[string]Decider `json:"quorum-deciders"`
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ExternalCount int `json:"external-slot-count"`
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}
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// NewRegistry ..
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func NewRegistry(extern int) Registry {
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return Registry{map[string]Decider{}, extern}
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}
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// Transition ..
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type Transition struct {
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Previous Registry `json:"previous"`
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Current Registry `json:"current"`
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}
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// These maps represent the signatories (validators), keys are BLS public keys
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// and values are BLS private key signed signatures
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type cIdentities struct {
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// Public keys of the committee including leader and validators
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publicKeys []*bls.PublicKey
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prepare *votepower.Round
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commit *votepower.Round
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// viewIDSigs: every validator
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// sign on |viewID|blockHash| in view changing message
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viewChange *votepower.Round
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}
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type depInject struct {
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shardIDProvider func() (uint32, error)
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publicKeyProvider func() (*multibls.PublicKey, error)
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}
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func (s *cIdentities) AggregateVotes(p Phase) *bls.Sign {
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ballots := s.ReadAllBallots(p)
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sigs := make([]*bls.Sign, 0, len(ballots))
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for _, ballot := range ballots {
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sig := &bls.Sign{}
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// NOTE invariant that shouldn't happen by now
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// but pointers are pointers
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if ballot != nil {
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sig.DeserializeHexStr(common.Bytes2Hex(ballot.Signature))
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sigs = append(sigs, sig)
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}
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}
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return bls_cosi.AggregateSig(sigs)
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}
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func (s *cIdentities) IndexOf(pubKey *bls.PublicKey) int {
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idx := -1
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for k, v := range s.publicKeys {
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if v.IsEqual(pubKey) {
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idx = k
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}
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}
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return idx
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}
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func (s *cIdentities) NextAfter(pubKey *bls.PublicKey) (bool, *bls.PublicKey) {
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found := false
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idx := s.IndexOf(pubKey)
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if idx != -1 {
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found = true
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}
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idx = (idx + 1) % int(s.ParticipantsCount())
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return found, s.publicKeys[idx]
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}
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func (s *cIdentities) Participants() []*bls.PublicKey {
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return s.publicKeys
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}
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func (s *cIdentities) UpdateParticipants(pubKeys []*bls.PublicKey) {
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for i := range pubKeys {
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k := shard.BLSPublicKey{}
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k.FromLibBLSPublicKey(pubKeys[i])
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}
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s.publicKeys = append(pubKeys[:0:0], pubKeys...)
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}
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func (s *cIdentities) ParticipantsCount() int64 {
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return int64(len(s.publicKeys))
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}
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func (s *cIdentities) SignersCount(p Phase) int64 {
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switch p {
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case Prepare:
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return int64(len(s.prepare.BallotBox))
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case Commit:
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return int64(len(s.commit.BallotBox))
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case ViewChange:
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return int64(len(s.viewChange.BallotBox))
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default:
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return 0
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}
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}
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func (s *cIdentities) SubmitVote(
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p Phase, PubKey *bls.PublicKey,
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sig *bls.Sign, headerHash common.Hash,
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height, viewID uint64,
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) (*votepower.Ballot, error) {
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// Note safe to assume by this point because key has been
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// checked earlier
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key := *shard.FromLibBLSPublicKeyUnsafe(PubKey)
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ballot := &votepower.Ballot{
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SignerPubKey: key,
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BlockHeaderHash: headerHash,
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Signature: common.Hex2Bytes(sig.SerializeToHexStr()),
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Height: height,
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ViewID: viewID,
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}
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switch p {
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case Prepare:
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s.prepare.BallotBox[key] = ballot
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case Commit:
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s.commit.BallotBox[key] = ballot
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case ViewChange:
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s.viewChange.BallotBox[key] = ballot
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default:
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return nil, errors.Wrapf(errPhaseUnknown, "given: %s", p.String())
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}
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return ballot, nil
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}
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func (s *cIdentities) reset(ps []Phase) {
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for i := range ps {
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switch m := votepower.NewRound(); ps[i] {
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case Prepare:
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s.prepare = m
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case Commit:
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s.commit = m
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case ViewChange:
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s.viewChange = m
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}
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}
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}
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func (s *cIdentities) TwoThirdsSignersCount() int64 {
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return s.ParticipantsCount()*2/3 + 1
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}
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func (s *cIdentities) ReadBallot(p Phase, PubKey *bls.PublicKey) *votepower.Ballot {
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ballotBox := map[shard.BLSPublicKey]*votepower.Ballot{}
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key := *shard.FromLibBLSPublicKeyUnsafe(PubKey)
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switch p {
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case Prepare:
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ballotBox = s.prepare.BallotBox
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case Commit:
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ballotBox = s.commit.BallotBox
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case ViewChange:
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ballotBox = s.viewChange.BallotBox
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}
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payload, ok := ballotBox[key]
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if !ok {
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return nil
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}
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return payload
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}
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func (s *cIdentities) ReadAllBallots(p Phase) []*votepower.Ballot {
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m := map[shard.BLSPublicKey]*votepower.Ballot{}
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switch p {
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case Prepare:
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m = s.prepare.BallotBox
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case Commit:
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m = s.commit.BallotBox
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case ViewChange:
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m = s.viewChange.BallotBox
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}
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ballots := make([]*votepower.Ballot, 0, len(m))
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for i := range m {
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ballots = append(ballots, m[i])
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}
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return ballots
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}
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func newBallotsBackedSignatureReader() *cIdentities {
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return &cIdentities{
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publicKeys: []*bls.PublicKey{},
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prepare: votepower.NewRound(),
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commit: votepower.NewRound(),
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viewChange: votepower.NewRound(),
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}
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}
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type composite struct {
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DependencyInjectionWriter
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DependencyInjectionReader
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SignatureReader
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}
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func (d *depInject) SetMyPublicKeyProvider(p func() (*multibls.PublicKey, error)) {
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d.publicKeyProvider = p
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}
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func (d *depInject) MyPublicKey() func() (*multibls.PublicKey, error) {
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return d.publicKeyProvider
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}
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// NewDecider ..
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func NewDecider(p Policy, shardID uint32) Decider {
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signatureStore := newBallotsBackedSignatureReader()
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deps := &depInject{}
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c := &composite{deps, deps, signatureStore}
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switch p {
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case SuperMajorityVote:
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return &uniformVoteWeight{
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c.DependencyInjectionWriter, c.DependencyInjectionReader, c,
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}
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case SuperMajorityStake:
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return &stakedVoteWeight{
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c.SignatureReader,
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c.DependencyInjectionWriter,
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c.DependencyInjectionWriter.(DependencyInjectionReader),
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*votepower.NewRoster(shardID),
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newBallotBox(),
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}
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default:
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// Should not be possible
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return nil
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}
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}
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