prysm-pulse/beacon-chain/sync/validate_beacon_attestation.go

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package sync
import (
"context"
"time"
"github.com/gogo/protobuf/proto"
"github.com/prysmaticlabs/go-ssz"
"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
ethpb "github.com/prysmaticlabs/prysm/proto/eth/v1alpha1"
"github.com/prysmaticlabs/prysm/shared/bytesutil"
)
// validateBeaconAttestation validates that the block being voted for passes validation before forwarding to the
// network.
func (r *RegularSync) validateBeaconAttestation(ctx context.Context, msg proto.Message, p p2p.Broadcaster, fromSelf bool) bool {
// Attestation processing requires the target block to be present in the database, so we'll skip
// validating or processing attestations until fully synced.
if r.initialSync.Syncing() {
log.Debug("Not propagating or processing attestation during syncing")
return false
}
// TODO(1332): Add blocks.VerifyAttestation before processing further.
// Discussion: https://github.com/ethereum/eth2.0-specs/issues/1332
att := msg.(*ethpb.Attestation)
attRoot, err := ssz.HashTreeRoot(att)
if err != nil {
log.WithError(err).Error("Failed to hash attestation")
}
// Only valid blocks are saved in the database.
if !r.db.HasBlock(ctx, bytesutil.ToBytes32(att.Data.BeaconBlockRoot)) {
log.Warn("Ignored incoming attestation that points to a block that isn't in the database.")
return false
}
if recentlySeenRoots.Get(string(attRoot[:])) != nil {
return false
}
recentlySeenRoots.Set(string(attRoot[:]), true /*value*/, 365*24*time.Hour /*TTL*/)
if fromSelf {
return false
}
if err := p.Broadcast(ctx, msg); err != nil {
log.WithError(err).Error("Failed to broadcast message")
}
return true
}