prysm-pulse/beacon-chain/sync/validate_proposer_slashing.go
2020-11-22 14:31:55 -06:00

76 lines
2.3 KiB
Go

package sync
import (
"context"
"github.com/libp2p/go-libp2p-core/peer"
pubsub "github.com/libp2p/go-libp2p-pubsub"
ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
"github.com/prysmaticlabs/prysm/shared/traceutil"
"go.opencensus.io/trace"
)
// Clients who receive a proposer slashing on this topic MUST validate the conditions within VerifyProposerSlashing before
// forwarding it across the network.
func (s *Service) validateProposerSlashing(ctx context.Context, pid peer.ID, msg *pubsub.Message) pubsub.ValidationResult {
// Validation runs on publish (not just subscriptions), so we should approve any message from
// ourselves.
if pid == s.p2p.PeerID() {
return pubsub.ValidationAccept
}
// The head state will be too far away to validate any slashing.
if s.initialSync.Syncing() {
return pubsub.ValidationIgnore
}
ctx, span := trace.StartSpan(ctx, "sync.validateProposerSlashing")
defer span.End()
m, err := s.decodePubsubMessage(msg)
if err != nil {
log.WithError(err).Debug("Could not decode message")
traceutil.AnnotateError(span, err)
return pubsub.ValidationReject
}
slashing, ok := m.(*ethpb.ProposerSlashing)
if !ok {
return pubsub.ValidationReject
}
if slashing.Header_1 == nil || slashing.Header_1.Header == nil {
return pubsub.ValidationReject
}
if s.hasSeenProposerSlashingIndex(slashing.Header_1.Header.ProposerIndex) {
return pubsub.ValidationIgnore
}
headState, err := s.chain.HeadState(ctx)
if err != nil {
return pubsub.ValidationIgnore
}
if err := blocks.VerifyProposerSlashing(headState, slashing); err != nil {
return pubsub.ValidationReject
}
msg.ValidatorData = slashing // Used in downstream subscriber
return pubsub.ValidationAccept
}
// Returns true if the node has already received a valid proposer slashing received for the proposer with index
func (s *Service) hasSeenProposerSlashingIndex(i uint64) bool {
s.seenProposerSlashingLock.RLock()
defer s.seenProposerSlashingLock.RUnlock()
_, seen := s.seenProposerSlashingCache.Get(i)
return seen
}
// Set proposer slashing index in proposer slashing cache.
func (s *Service) setProposerSlashingIndexSeen(i uint64) {
s.seenProposerSlashingLock.Lock()
defer s.seenProposerSlashingLock.Unlock()
s.seenProposerSlashingCache.Add(i, true)
}