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eligibility_validator.go
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eligibility_validator.go
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package proposals
import (
"bytes"
"context"
"errors"
"fmt"
"github.com/spacemeshos/go-spacemesh/common/types"
"github.com/spacemeshos/go-spacemesh/log"
"github.com/spacemeshos/go-spacemesh/signing"
"github.com/spacemeshos/go-spacemesh/system"
)
var (
errTargetEpochMismatch = errors.New("ATX target epoch and ballot publish epoch mismatch")
errPublicKeyMismatch = errors.New("ballot smesher key and ATX node key mismatch")
errIncorrectCounter = errors.New("proof counter larger than number of slots available")
errInvalidProofsOrder = errors.New("proofs are out of order")
errIncorrectVRFSig = errors.New("proof contains incorrect VRF signature")
errIncorrectLayerIndex = errors.New("ballot has incorrect layer index")
)
// Validator validates the eligibility of a Ballot.
// the validation focuses on eligibility only and assumes the Ballot to be valid otherwise.
type Validator struct {
avgLayerSize uint32
layersPerEpoch uint32
atxDB atxDB
mesh meshDB
beacons system.BeaconCollector
logger log.Log
}
// NewEligibilityValidator returns a new EligibilityValidator.
func NewEligibilityValidator(
avgLayerSize, layersPerEpoch uint32, db atxDB, bc system.BeaconCollector, m meshDB, lg log.Log,
) *Validator {
return &Validator{
avgLayerSize: avgLayerSize,
layersPerEpoch: layersPerEpoch,
atxDB: db,
mesh: m,
beacons: bc,
logger: lg,
}
}
// CheckEligibility checks that a ballot is eligible in the layer that it specifies.
func (v *Validator) CheckEligibility(ctx context.Context, ballot *types.Ballot) (bool, error) {
var (
weight, totalWeight uint64
err error
refBallot = ballot
epoch = ballot.LayerIndex.GetEpoch()
)
if ballot.RefBallot != types.EmptyBallotID {
if refBallot, err = v.mesh.GetBallot(ballot.RefBallot); err != nil {
return false, fmt.Errorf("get ref ballot %v: %w", ballot.RefBallot, err)
}
}
if refBallot.EpochData == nil {
return false, fmt.Errorf("%w: ref ballot %v", errMissingEpochData, refBallot.ID())
}
beacon := refBallot.EpochData.Beacon
if beacon == types.EmptyBeacon {
return false, fmt.Errorf("%w: ref ballot %v", errMissingBeacon, refBallot.ID())
}
activeSets := refBallot.EpochData.ActiveSet
if len(activeSets) == 0 {
return false, fmt.Errorf("%w: ref ballot %v", errEmptyActiveSet, refBallot.ID())
}
// todo: optimize by using reference to active set size and cache active set size to not load all atxsIDs from db
for _, atxID := range activeSets {
atx, err := v.atxDB.GetAtxHeader(atxID)
if err != nil {
return false, fmt.Errorf("get ATX header: %w", err)
}
totalWeight += atx.GetWeight()
}
atx, err := v.getBallotATX(ctx, ballot)
if err != nil {
return false, err
}
weight = atx.GetWeight()
numEligibleSlots, err := GetNumEligibleSlots(weight, totalWeight, v.avgLayerSize, v.layersPerEpoch)
if err != nil {
return false, err
}
var (
last uint32
isFirst = true
)
for _, proof := range ballot.EligibilityProofs {
counter := proof.J
if counter >= numEligibleSlots {
return false, fmt.Errorf("%w: proof counter (%d) numEligibleBallots (%d), totalWeight (%v)",
errIncorrectCounter, counter, numEligibleSlots, totalWeight)
}
if isFirst {
isFirst = false
} else if counter <= last {
return false, fmt.Errorf("%w: %d <= %d", errInvalidProofsOrder, counter, last)
}
last = counter
message, err := SerializeVRFMessage(beacon, epoch, counter)
if err != nil {
return false, err
}
vrfSig := proof.Sig
beaconStr := beacon.ShortString()
if !signing.VRFVerify(atx.NodeID.ToBytes(), message, vrfSig) {
return false, fmt.Errorf("%w: beacon: %v, epoch: %v, counter: %v, vrfSig: %v",
errIncorrectVRFSig, beaconStr, epoch, counter, types.BytesToHash(vrfSig).ShortString())
}
eligibleLayer := CalcEligibleLayer(epoch, v.layersPerEpoch, vrfSig)
if ballot.LayerIndex != eligibleLayer {
return false, fmt.Errorf("%w: ballot layer (%v), eligible layer (%v)",
errIncorrectLayerIndex, ballot.LayerIndex, eligibleLayer)
}
}
v.logger.WithContext(ctx).With().Info("ballot eligibility verified",
ballot.ID(),
ballot.LayerIndex,
epoch,
beacon,
)
v.beacons.ReportBeaconFromBallot(epoch, ballot.ID(), beacon, weight)
return true, nil
}
func (v Validator) getBallotATX(ctx context.Context, ballot *types.Ballot) (*types.ActivationTxHeader, error) {
if ballot.AtxID == *types.EmptyATXID {
v.logger.WithContext(ctx).Panic("empty ATXID in ballot")
}
epoch := ballot.LayerIndex.GetEpoch()
atx, err := v.atxDB.GetAtxHeader(ballot.AtxID)
if err != nil {
return nil, fmt.Errorf("get ballot ATX %v epoch %v: %w", ballot.AtxID.ShortString(), epoch, err)
}
if targetEpoch := atx.PubLayerID.GetEpoch() + 1; targetEpoch != epoch {
return nil, fmt.Errorf("%w: ATX target epoch (%v), ballot publication epoch (%v)",
errTargetEpochMismatch, targetEpoch, epoch)
}
if pub := ballot.SmesherID(); bytes.Compare(atx.NodeID[:], pub.Bytes()) != 0 {
return nil, fmt.Errorf("%w: public key (%v), ATX node key (%v)", errPublicKeyMismatch, pub.String(), atx.NodeID)
}
return atx, nil
}