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node_cross_link.go
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node_cross_link.go
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package node
import (
"math/big"
ffi_bls "github.com/PositionExchange/bls/ffi/go/bls"
"github.com/PositionExchange/posichain/core"
"github.com/PositionExchange/posichain/core/types"
"github.com/PositionExchange/posichain/internal/utils"
"github.com/PositionExchange/posichain/shard"
common2 "github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/rlp"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
)
const (
maxPendingCrossLinkSize = 1000
crossLinkBatchSize = 3
)
// ProcessCrossLinkHeartbeatMessage process crosslink heart beat signal.
// This function is only called on shards 1,2,3 when network message `CrosslinkHeartbeat` receiving.
func (node *Node) ProcessCrossLinkHeartbeatMessage(msgPayload []byte) {
if err := node.processCrossLinkHeartbeatMessage(msgPayload); err != nil {
utils.Logger().Err(err).
Msg("[ProcessCrossLinkHeartbeatMessage] failed process crosslink heartbeat signal")
}
}
func (node *Node) processCrossLinkHeartbeatMessage(msgPayload []byte) error {
hb := types.CrosslinkHeartbeat{}
err := rlp.DecodeBytes(msgPayload, &hb)
if err != nil {
return err
}
shardID := node.Blockchain().CurrentBlock().ShardID()
if hb.ShardID != shardID {
return errors.Errorf("invalid shard id: expected %d, got %d", shardID, hb.ShardID)
}
// Outdated signal.
if s := node.crosslinks.LastKnownCrosslinkHeartbeatSignal(); s != nil && s.LatestContinuousBlockNum > hb.LatestContinuousBlockNum {
return nil
}
sig := &ffi_bls.Sign{}
err = sig.Deserialize(hb.Signature)
if err != nil {
return err
}
hb.Signature = nil
serialized, err := rlp.EncodeToBytes(hb)
if err != nil {
return err
}
pub := ffi_bls.PublicKey{}
err = pub.Deserialize(hb.PublicKey)
if err != nil {
return err
}
ok := sig.VerifyHash(&pub, serialized)
if !ok {
return errors.New("invalid signature")
}
state, err := node.EpochChain().ReadShardState(big.NewInt(int64(hb.Epoch)))
if err != nil {
return err
}
committee, err := state.FindCommitteeByID(shard.BeaconChainShardID)
if err != nil {
return err
}
pubs, err := committee.BLSPublicKeys()
if err != nil {
return err
}
keyExists := false
for _, row := range pubs {
if pub.IsEqual(row.Object) {
keyExists = true
break
}
}
if !keyExists {
return errors.New("pub key doesn't exist")
}
utils.Logger().Info().
Msgf("[ProcessCrossLinkHeartbeatMessage] storing hb signal with block num %d", hb.LatestContinuousBlockNum)
node.crosslinks.SetLastKnownCrosslinkHeartbeatSignal(&hb)
return nil
}
// ProcessCrossLinkMessage verify and process Node/CrossLink message into crosslink when it's valid
func (node *Node) ProcessCrossLinkMessage(msgPayload []byte) {
if node.IsRunningBeaconChain() {
pendingCLs, err := node.Blockchain().ReadPendingCrossLinks()
if err == nil && len(pendingCLs) >= maxPendingCrossLinkSize {
utils.Logger().Debug().
Msgf("[ProcessingCrossLink] Pending Crosslink reach maximum size: %d", len(pendingCLs))
return
}
existingCLs := map[common2.Hash]struct{}{}
for _, pending := range pendingCLs {
existingCLs[pending.Hash()] = struct{}{}
}
var crosslinks []types.CrossLink
if err := rlp.DecodeBytes(msgPayload, &crosslinks); err != nil {
utils.Logger().Error().
Err(err).
Msg("[ProcessingCrossLink] Crosslink Message Broadcast Unable to Decode")
return
}
var candidates []types.CrossLink
utils.Logger().Debug().
Msgf("[ProcessingCrossLink] Received crosslinks: %d", len(crosslinks))
for i, cl := range crosslinks {
if i > crossLinkBatchSize*2 { // A sanity check to prevent spamming
break
}
if _, ok := existingCLs[cl.Hash()]; ok {
nodeCrossLinkMessageCounterVec.With(prometheus.Labels{"type": "duplicate_crosslink"}).Inc()
utils.Logger().Debug().Err(err).
Msgf("[ProcessingCrossLink] Cross Link already exists in pending queue, pass. Beacon Epoch: %d, Block num: %d, Epoch: %d, shardID %d",
node.Blockchain().CurrentHeader().Epoch(), cl.Number(), cl.Epoch(), cl.ShardID())
continue
}
// ReadCrossLink beacon chain usage.
exist, err := node.Blockchain().ReadCrossLink(cl.ShardID(), cl.Number().Uint64())
if err == nil && exist != nil {
nodeCrossLinkMessageCounterVec.With(prometheus.Labels{"type": "duplicate_crosslink"}).Inc()
utils.Logger().Debug().Err(err).
Msgf("[ProcessingCrossLink] Cross Link already exists, pass. Beacon Epoch: %d, Block num: %d, Epoch: %d, shardID %d", node.Blockchain().CurrentHeader().Epoch(), cl.Number(), cl.Epoch(), cl.ShardID())
continue
}
if err = core.VerifyCrossLink(node.Blockchain(), cl); err != nil {
nodeCrossLinkMessageCounterVec.With(prometheus.Labels{"type": "invalid_crosslink"}).Inc()
utils.Logger().Info().
Str("cross-link-issue", err.Error()).
Msgf("[ProcessingCrossLink] Failed to verify new cross link for blockNum %d epochNum %d shard %d skipped: %v", cl.BlockNum(), cl.Epoch().Uint64(), cl.ShardID(), cl)
continue
}
candidates = append(candidates, cl)
nodeCrossLinkMessageCounterVec.With(prometheus.Labels{"type": "new_crosslink"}).Inc()
utils.Logger().Debug().
Msgf("[ProcessingCrossLink] Committing for shardID %d, blockNum %d",
cl.ShardID(), cl.Number().Uint64(),
)
}
Len, _ := node.Blockchain().AddPendingCrossLinks(candidates)
utils.Logger().Debug().
Msgf("[ProcessingCrossLink] Add pending crosslinks, total pending: %d", Len)
}
}
// VerifyCrossLink verifies the header is valid
func (node *Node) VerifyCrossLink(cl types.CrossLink) error {
if node.Blockchain().ShardID() != shard.BeaconChainShardID {
return errors.New("[VerifyCrossLink] Shard chains should not verify cross links")
}
instance := shard.Schedule.InstanceForEpoch(node.Blockchain().CurrentHeader().Epoch())
if cl.ShardID() >= instance.NumShards() {
return errors.New("[VerifyCrossLink] ShardID should less than NumShards")
}
engine := node.Blockchain().Engine()
if err := engine.VerifyCrossLink(node.Blockchain(), cl); err != nil {
return errors.Wrap(err, "[VerifyCrossLink]")
}
return nil
}