vendor: sync to latest core (#253)

16 files changed, 742 insertions, 138 deletions

diff --git a/core/rawdb/accessors_core_dkg_master_private_shares.go b/core/rawdb/accessors_core_dkg_master_private_shares.go
new file mode 100644
index 000000000..23b37f361
--- /dev/null
+++ b/core/rawdb/accessors_core_dkg_master_private_shares.go
@@ -0,0 +1,44 @@
+package rawdb
+
+import (
+	"bytes"
+
+	coreDKG "github.com/dexon-foundation/dexon-consensus/core/crypto/dkg"
+	"github.com/dexon-foundation/dexon/log"
+	"github.com/dexon-foundation/dexon/rlp"
+)
+
+func ReadCoreDKGMasterPrivateSharesRLP(db DatabaseReader, round uint64) rlp.RawValue {
+	data, _ := db.Get(coreDKGMasterPrivateSharesKey(round))
+	return data
+}
+
+func WriteCoreDKGMasterPrivateSharesRLP(db DatabaseWriter, round uint64, rlp rlp.RawValue) error {
+	err := db.Put(coreDKGMasterPrivateSharesKey(round), rlp)
+	if err != nil {
+		log.Crit("Failed to store core DKG private key", "err", err, "round", round)
+	}
+	return err
+}
+
+func ReadCoreDKGMasterPrivateShares(db DatabaseReader, round uint64) *coreDKG.PrivateKeyShares {
+	data := ReadCoreDKGMasterPrivateSharesRLP(db, round)
+	if len(data) == 0 {
+		return nil
+	}
+	shares := new(coreDKG.PrivateKeyShares)
+	if err := rlp.Decode(bytes.NewReader(data), shares); err != nil {
+		log.Error("Invalid core DKG master private shares RLP", "round", round, "err", err)
+		return nil
+	}
+	return shares
+}
+
+func WriteCoreDKGMasterPrivateShares(db DatabaseWriter, round uint64, shares *coreDKG.PrivateKeyShares) error {
+	data, err := rlp.EncodeToBytes(shares)
+	if err != nil {
+		log.Crit("Failed to RLP encode core DKG master private shares", "round", round, "err", err)
+		return err
+	}
+	return WriteCoreDKGMasterPrivateSharesRLP(db, round, data)
+}
diff --git a/core/rawdb/schema.go b/core/rawdb/schema.go
index 87a56c0ba..b469468f4 100644
--- a/core/rawdb/schema.go
+++ b/core/rawdb/schema.go
@@ -53,9 +53,10 @@ var (
 	txLookupPrefix  = []byte("l") // txLookupPrefix + hash -> transaction/receipt lookup metadata
 	bloomBitsPrefix = []byte("B") // bloomBitsPrefix + bit (uint16 big endian) + section (uint64 big endian) + hash -> bloom bits
 
-	coreBlockPrefix           = []byte("D")
-	coreDKGPrivateKeyPrefix   = []byte("DPK")
-	coreCompactionChainTipKey = []byte("CoreChainTip")
+	coreBlockPrefix                  = []byte("D")
+	coreDKGPrivateKeyPrefix          = []byte("DPK")
+	coreCompactionChainTipKey        = []byte("CoreChainTip")
+	coreDKGMasterPrivateSharesPrefix = []byte("CoreDKGPrv")
 
 	preimagePrefix = []byte("secure-key-")      // preimagePrefix + hash -> preimage
 	configPrefix   = []byte("ethereum-config-") // config prefix for the db
@@ -130,6 +131,14 @@ func coreDKGPrivateKeyKey(round uint64) []byte {
 	return ret
 }
 
+// coreDKGMasterPrivateSharesKey = coreDKGMasterPrivateSharesPrefix + round
+func coreDKGMasterPrivateSharesKey(round uint64) []byte {
+	ret := make([]byte, len(coreDKGMasterPrivateSharesPrefix)+8)
+	copy(ret, coreDKGMasterPrivateSharesPrefix)
+	binary.LittleEndian.PutUint64(ret[len(coreDKGMasterPrivateSharesPrefix):], round)
+	return ret
+}
+
 // bloomBitsKey = bloomBitsPrefix + bit (uint16 big endian) + section (uint64 big endian) + hash
 func bloomBitsKey(bit uint, section uint64, hash common.Hash) []byte {
 	key := append(append(bloomBitsPrefix, make([]byte, 10)...), hash.Bytes()...)
diff --git a/dex/db/db.go b/dex/db/db.go
index d51c2df54..b172f924b 100644
--- a/dex/db/db.go
+++ b/dex/db/db.go
@@ -104,4 +104,18 @@ func (d *DB) GetCompactionChainTipInfo() (hash coreCommon.Hash, height uint64) {
 	return rawdb.ReadCoreCompactionChainTip(d.db)
 }
 
+func (d *DB) PutOrUpdateDKGMasterPrivateShares(
+	round uint64, shares coreDKG.PrivateKeyShares) error {
+	return rawdb.WriteCoreDKGMasterPrivateShares(d.db, round, &shares)
+}
+
+func (d *DB) GetDKGMasterPrivateShares(round uint64) (
+	shares coreDKG.PrivateKeyShares, err error) {
+	mpk := rawdb.ReadCoreDKGMasterPrivateShares(d.db, round)
+	if mpk == nil {
+		return coreDKG.PrivateKeyShares{}, coreDb.ErrDKGMasterPrivateSharesDoesNotExist
+	}
+	return *mpk, nil
+}
+
 func (d *DB) Close() error { return nil }
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement-mgr.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement-mgr.go
index 88cc432ff..7b5effba8 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement-mgr.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement-mgr.go
@@ -65,7 +65,7 @@ func genValidLeader(
 }
 
 type agreementMgrConfig struct {
-	roundBasedConfig
+	utils.RoundBasedConfig
 
 	notarySetSize uint32
 	lambdaBA      time.Duration
@@ -77,14 +77,14 @@ func (c *agreementMgrConfig) from(
 	c.notarySetSize = config.NotarySetSize
 	c.lambdaBA = config.LambdaBA
 	c.crs = crs
-	c.setupRoundBasedFields(round, config)
+	c.SetupRoundBasedFields(round, config)
 }
 
 func newAgreementMgrConfig(prev agreementMgrConfig, config *types.Config,
 	crs common.Hash) (c agreementMgrConfig) {
 	c = agreementMgrConfig{}
-	c.from(prev.roundID+1, config, crs)
-	c.setRoundBeginHeight(prev.roundEndHeight)
+	c.from(prev.RoundID()+1, config, crs)
+	c.AppendTo(prev.RoundBasedConfig)
 	return
 }
 
@@ -356,7 +356,7 @@ Loop:
 		setting.recv.isNotary = checkRound()
 		// Run BA for this round.
 		setting.recv.roundValue.Store(currentRound)
-		setting.recv.changeNotaryHeight = curConfig.roundEndHeight
+		setting.recv.changeNotaryHeight = curConfig.RoundEndHeight()
 		setting.recv.restartNotary <- types.Position{
 			Round:  setting.recv.round(),
 			Height: math.MaxUint64,
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/blockchain.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/blockchain.go
index b6c8b1da5..19a580b4f 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/blockchain.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/blockchain.go
@@ -103,21 +103,21 @@ func (pb pendingBlockRecords) searchByPosition(p types.Position) (
 }
 
 type blockChainConfig struct {
-	roundBasedConfig
+	utils.RoundBasedConfig
 
 	minBlockInterval time.Duration
 }
 
 func (c *blockChainConfig) fromConfig(round uint64, config *types.Config) {
 	c.minBlockInterval = config.MinBlockInterval
-	c.setupRoundBasedFields(round, config)
+	c.SetupRoundBasedFields(round, config)
 }
 
 func newBlockChainConfig(prev blockChainConfig, config *types.Config) (
 	c blockChainConfig) {
 	c = blockChainConfig{}
-	c.fromConfig(prev.roundID+1, config)
-	c.setRoundBeginHeight(prev.roundEndHeight)
+	c.fromConfig(prev.RoundID()+1, config)
+	c.AppendTo(prev.RoundBasedConfig)
 	return
 }
 
@@ -145,14 +145,14 @@ func newBlockChain(nID types.NodeID, dMoment time.Time, initBlock *types.Block,
 	initConfig blockChainConfig, app Application, vGetter tsigVerifierGetter,
 	signer *utils.Signer, logger common.Logger) *blockChain {
 	if initBlock != nil {
-		if initConfig.roundID != initBlock.Position.Round {
+		if initConfig.RoundID() != initBlock.Position.Round {
 			panic(fmt.Errorf("incompatible config/block %s %d",
-				initBlock, initConfig.roundID))
+				initBlock, initConfig.RoundID()))
 		}
 	} else {
-		if initConfig.roundID != 0 {
+		if initConfig.RoundID() != 0 {
 			panic(fmt.Errorf("genesis config should from round 0 %d",
-				initConfig.roundID))
+				initConfig.RoundID()))
 		}
 	}
 	return &blockChain{
@@ -235,7 +235,7 @@ func (bc *blockChain) sanityCheck(b *types.Block) error {
 		return ErrInvalidBlockHeight
 	}
 	tipConfig := bc.tipConfig()
-	if tipConfig.isLastBlock(bc.lastConfirmed) {
+	if tipConfig.IsLastBlock(bc.lastConfirmed) {
 		if b.Position.Round != bc.lastConfirmed.Position.Round+1 {
 			return ErrRoundNotSwitch
 		}
@@ -359,7 +359,7 @@ func (bc *blockChain) tipRound() uint64 {
 		return 0
 	}
 	offset, tipConfig := uint64(0), bc.tipConfig()
-	if tipConfig.isLastBlock(bc.lastConfirmed) {
+	if tipConfig.IsLastBlock(bc.lastConfirmed) {
 		offset++
 	}
 	return bc.lastConfirmed.Position.Round + offset
@@ -499,12 +499,12 @@ func (bc *blockChain) checkIfBlocksConfirmed() {
 }
 
 func (bc *blockChain) purgeConfig() {
-	for bc.configs[0].roundID < bc.lastConfirmed.Position.Round {
+	for bc.configs[0].RoundID() < bc.lastConfirmed.Position.Round {
 		bc.configs = bc.configs[1:]
 	}
-	if bc.configs[0].roundID != bc.lastConfirmed.Position.Round {
+	if bc.configs[0].RoundID() != bc.lastConfirmed.Position.Round {
 		panic(fmt.Errorf("mismatched tip config: %d %d",
-			bc.configs[0].roundID, bc.lastConfirmed.Position.Round))
+			bc.configs[0].RoundID(), bc.lastConfirmed.Position.Round))
 	}
 }
 
@@ -556,7 +556,7 @@ func (bc *blockChain) prepareBlock(position types.Position,
 			b, err = nil, ErrNotFollowTipPosition
 			return
 		}
-		if tipConfig.isLastBlock(tip) {
+		if tipConfig.IsLastBlock(tip) {
 			if tip.Position.Round+1 != position.Round {
 				b, err = nil, ErrRoundNotSwitch
 				return
@@ -610,9 +610,9 @@ func (bc *blockChain) tipConfig() blockChainConfig {
 	if bc.lastConfirmed == nil {
 		panic(fmt.Errorf("attempting to access config without tip"))
 	}
-	if bc.lastConfirmed.Position.Round != bc.configs[0].roundID {
+	if bc.lastConfirmed.Position.Round != bc.configs[0].RoundID() {
 		panic(fmt.Errorf("inconsist config and tip: %d %d",
-			bc.lastConfirmed.Position.Round, bc.configs[0].roundID))
+			bc.lastConfirmed.Position.Round, bc.configs[0].RoundID()))
 	}
 	return bc.configs[0]
 }
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/configuration-chain.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/configuration-chain.go
index 9e8df6bd1..9214cd97d 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/configuration-chain.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/configuration-chain.go
@@ -106,6 +106,12 @@ func (cc *configurationChain) registerDKG(round uint64, threshold int) {
 		cc.recv,
 		round,
 		threshold)
+	err = cc.db.PutOrUpdateDKGMasterPrivateShares(round, *cc.dkg.prvShares)
+	if err != nil {
+		cc.logger.Error("Error put or update DKG master private shares", "error",
+			err)
+		return
+	}
 	go func() {
 		ticker := newTicker(cc.gov, round, TickerDKG)
 		defer ticker.Stop()
@@ -287,33 +293,58 @@ func (cc *configurationChain) getDKGInfo(
 }
 
 func (cc *configurationChain) recoverDKGInfo(round uint64) error {
-	cc.dkgResult.Lock()
-	defer cc.dkgResult.Unlock()
-	_, signerExists := cc.dkgSigner[round]
-	_, npksExists := cc.npks[round]
+	var npksExists, signerExists bool
+	func() {
+		cc.dkgResult.Lock()
+		defer cc.dkgResult.Unlock()
+		_, signerExists = cc.dkgSigner[round]
+		_, npksExists = cc.npks[round]
+	}()
 	if signerExists && npksExists {
 		return nil
 	}
 	if !cc.gov.IsDKGFinal(round) {
 		return ErrDKGNotReady
 	}
-	// Restore group public key.
-	npks, err := typesDKG.NewNodePublicKeys(round,
-		cc.gov.DKGMasterPublicKeys(round),
-		cc.gov.DKGComplaints(round),
-		utils.GetDKGThreshold(
-			utils.GetConfigWithPanic(cc.gov, round, cc.logger)))
-	if err != nil {
-		return err
-	}
-	// Check if we have private shares in DB.
-	prvKey, err := cc.db.GetDKGPrivateKey(round)
-	if err != nil {
-		return err
-	}
-	cc.npks[round] = npks
-	cc.dkgSigner[round] = &dkgShareSecret{
-		privateKey: &prvKey,
+
+	if !npksExists {
+		threshold := utils.GetDKGThreshold(
+			utils.GetConfigWithPanic(cc.gov, round, cc.logger))
+		// Restore group public key.
+		cc.logger.Debug("Calling Governance.DKGMasterPublicKeys for recoverDKGInfo",
+			"round", round)
+		cc.logger.Debug("Calling Governance.DKGComplaints for recoverDKGInfo",
+			"round", round)
+		npks, err := typesDKG.NewNodePublicKeys(round,
+			cc.gov.DKGMasterPublicKeys(round),
+			cc.gov.DKGComplaints(round),
+			threshold)
+		if err != nil {
+			cc.logger.Warn("Failed to create DKGGroupPublicKey",
+				"round", round, "error", err)
+			return err
+		}
+		func() {
+			cc.dkgResult.Lock()
+			defer cc.dkgResult.Unlock()
+			cc.npks[round] = npks
+		}()
+	}
+	if !signerExists {
+		// Check if we have private shares in DB.
+		prvKey, err := cc.db.GetDKGPrivateKey(round)
+		if err != nil {
+			cc.logger.Warn("Failed to create DKGPrivateKey",
+				"round", round, "error", err)
+			return err
+		}
+		func() {
+			cc.dkgResult.Lock()
+			defer cc.dkgResult.Unlock()
+			cc.dkgSigner[round] = &dkgShareSecret{
+				privateKey: &prvKey,
+			}
+		}()
 	}
 	return nil
 }
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus.go
index ccb332684..4201cbcc2 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus.go
@@ -538,6 +538,11 @@ func newConsensusForRound(
 		logger:       logger,
 	}
 	cfgModule := newConfigurationChain(ID, recv, gov, nodeSetCache, db, logger)
+	dkg, err := recoverDKGProtocol(ID, recv, initRound, utils.GetDKGThreshold(initConfig), db)
+	if err != nil {
+		panic(err)
+	}
+	cfgModule.dkg = dkg
 	recv.cfgModule = cfgModule
 	appModule := app
 	if usingNonBlocking {
@@ -545,7 +550,7 @@ func newConsensusForRound(
 	}
 	bcConfig := blockChainConfig{}
 	bcConfig.fromConfig(initRound, initConfig)
-	bcConfig.setRoundBeginHeight(initRoundBeginHeight)
+	bcConfig.SetRoundBeginHeight(initRoundBeginHeight)
 	bcModule := newBlockChain(ID, dMoment, initBlock, bcConfig, appModule,
 		NewTSigVerifierCache(gov, 7), signer, logger)
 	// Construct Consensus instance.
@@ -573,8 +578,7 @@ func newConsensusForRound(
 	con.ctx, con.ctxCancel = context.WithCancel(context.Background())
 	baConfig := agreementMgrConfig{}
 	baConfig.from(initRound, initConfig, initCRS)
-	baConfig.setRoundBeginHeight(initRoundBeginHeight)
-	var err error
+	baConfig.SetRoundBeginHeight(initRoundBeginHeight)
 	con.baMgr, err = newAgreementMgr(con, initRound, baConfig)
 	if err != nil {
 		panic(err)
@@ -845,6 +849,10 @@ func (con *Consensus) initialRound(
 				con.logger.Warn("Failed to update nodeSetCache",
 					"round", round+1, "error", err)
 			}
+			if _, _, err := con.bcModule.vGetter.UpdateAndGet(round + 1); err != nil {
+				con.logger.Warn("Failed to update tsigVerifierCache",
+					"round", round+1, "error", err)
+			}
 		}()
 	})
 }
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/dkg.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/dkg.go
index f6b3e0e1b..425d96b95 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/dkg.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto/dkg/dkg.go
@@ -131,6 +131,33 @@ func (prvs *PrivateKeyShares) Equal(other *PrivateKeyShares) bool {
 	return true
 }
 
+// EncodeRLP implements rlp.Encoder
+func (prvs *PrivateKeyShares) EncodeRLP(w io.Writer) error {
+	mpks := make([][]byte, len(prvs.masterPrivateKey))
+	for i, m := range prvs.masterPrivateKey {
+		mpks[i] = m.GetLittleEndian()
+	}
+	return rlp.Encode(w, mpks)
+}
+
+// DecodeRLP implements rlp.Decoder
+func (prvs *PrivateKeyShares) DecodeRLP(s *rlp.Stream) error {
+	var dec [][]byte
+	if err := s.Decode(&dec); err != nil {
+		return err
+	}
+
+	for _, k := range dec {
+		var key bls.SecretKey
+		if err := key.SetLittleEndian(k); err != nil {
+			return err
+		}
+		prvs.masterPrivateKey = append(prvs.masterPrivateKey, key)
+	}
+
+	return nil
+}
+
 // PublicKeyShares represents a public key shares for DKG protocol.
 type PublicKeyShares struct {
 	shareCaches     []PublicKey
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/db/interfaces.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/db/interfaces.go
index ebbbbd475..e95861112 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/db/interfaces.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/db/interfaces.go
@@ -50,6 +50,12 @@ var (
 	// ErrDKGPrivateKeyDoesNotExist raised when the DKG private key of the
 	// requested round does not exists.
 	ErrDKGPrivateKeyDoesNotExist = errors.New("dkg private key does not exists")
+	// ErrDKGMasterPrivateSharesExists raised when attempting to save DKG master private shares
+	// that already saved.
+	ErrDKGMasterPrivateSharesExists = errors.New("dkg master private shares exists")
+	// ErrDKGMasterPrivateSharesDoesNotExist raised when the DKG master private shares of the
+	// requested round does not exists.
+	ErrDKGMasterPrivateSharesDoesNotExist = errors.New("dkg master private shares does not exists")
 )
 
 // Database is the interface for a Database.
@@ -76,6 +82,7 @@ type Reader interface {
 	// DKG Private Key related methods.
 	HasDKGPrivateKey(round uint64) (bool, error)
 	GetDKGPrivateKey(round uint64) (dkg.PrivateKey, error)
+	GetDKGMasterPrivateShares(round uint64) (shares dkg.PrivateKeyShares, err error)
 }
 
 // Writer defines the interface for writing blocks into DB.
@@ -84,6 +91,7 @@ type Writer interface {
 	PutBlock(block types.Block) error
 	PutCompactionChainTipInfo(common.Hash, uint64) error
 	PutDKGPrivateKey(uint64, dkg.PrivateKey) error
+	PutOrUpdateDKGMasterPrivateShares(round uint64, shares dkg.PrivateKeyShares) error
 }
 
 // BlockIterator defines an iterator on blocks hold
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/db/level-db.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/db/level-db.go
index 1fe29fa10..efa1fecbc 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/db/level-db.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/db/level-db.go
@@ -29,9 +29,10 @@ import (
 )
 
 var (
-	blockKeyPrefix            = []byte("b-")
-	compactionChainTipInfoKey = []byte("cc-tip")
-	dkgPrivateKeyKeyPrefix    = []byte("dkg-prvs")
+	blockKeyPrefix               = []byte("b-")
+	compactionChainTipInfoKey    = []byte("cc-tip")
+	dkgPrivateKeyKeyPrefix       = []byte("dkg-prvs")
+	dkgMasterPrivateSharesPrefix = []byte("dkg-master-private-shares")
 )
 
 type compactionChainTipInfo struct {
@@ -188,6 +189,11 @@ func (lvl *LevelDBBackedDB) HasDKGPrivateKey(round uint64) (bool, error) {
 	return lvl.db.Has(lvl.getDKGPrivateKeyKey(round), nil)
 }
 
+// HasDKGMasterPrivateSharesKey check existence of DKG master private shares of one round.
+func (lvl *LevelDBBackedDB) HasDKGMasterPrivateSharesKey(round uint64) (bool, error) {
+	return lvl.db.Has(lvl.getDKGMasterPrivateSharesKey(round), nil)
+}
+
 // GetDKGPrivateKey get DKG private key of one round.
 func (lvl *LevelDBBackedDB) GetDKGPrivateKey(round uint64) (
 	prv dkg.PrivateKey, err error) {
@@ -221,6 +227,32 @@ func (lvl *LevelDBBackedDB) PutDKGPrivateKey(
 		lvl.getDKGPrivateKeyKey(round), marshaled, nil)
 }
 
+// GetDKGMasterPrivateShares get DKG master private shares of one round.
+func (lvl *LevelDBBackedDB) GetDKGMasterPrivateShares(round uint64) (
+	shares dkg.PrivateKeyShares, err error) {
+	queried, err := lvl.db.Get(lvl.getDKGMasterPrivateSharesKey(round), nil)
+	if err != nil {
+		if err == leveldb.ErrNotFound {
+			err = ErrDKGMasterPrivateSharesDoesNotExist
+		}
+		return
+	}
+
+	err = rlp.DecodeBytes(queried, &shares)
+	return
+}
+
+// PutOrUpdateDKGMasterPrivateShares save DKG master private shares of one round.
+func (lvl *LevelDBBackedDB) PutOrUpdateDKGMasterPrivateShares(
+	round uint64, shares dkg.PrivateKeyShares) error {
+	marshaled, err := rlp.EncodeToBytes(&shares)
+	if err != nil {
+		return err
+	}
+	return lvl.db.Put(
+		lvl.getDKGMasterPrivateSharesKey(round), marshaled, nil)
+}
+
 func (lvl *LevelDBBackedDB) getBlockKey(hash common.Hash) (ret []byte) {
 	ret = make([]byte, len(blockKeyPrefix)+len(hash[:]))
 	copy(ret, blockKeyPrefix)
@@ -236,3 +268,10 @@ func (lvl *LevelDBBackedDB) getDKGPrivateKeyKey(
 		ret[len(dkgPrivateKeyKeyPrefix):], round)
 	return
 }
+
+func (lvl *LevelDBBackedDB) getDKGMasterPrivateSharesKey(round uint64) (ret []byte) {
+	ret = make([]byte, len(dkgMasterPrivateSharesPrefix)+8)
+	copy(ret, dkgMasterPrivateSharesPrefix)
+	binary.LittleEndian.PutUint64(ret[len(dkgMasterPrivateSharesPrefix):], round)
+	return
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/db/memory.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/db/memory.go
index 4bc08e704..548e41e90 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/db/memory.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/db/memory.go
@@ -42,24 +42,27 @@ func (seq *blockSeqIterator) NextBlock() (types.Block, error) {
 
 // MemBackedDB is a memory backed DB implementation.
 type MemBackedDB struct {
-	blocksLock               sync.RWMutex
-	blockHashSequence        common.Hashes
-	blocksByHash             map[common.Hash]*types.Block
-	compactionChainTipLock   sync.RWMutex
-	compactionChainTipHash   common.Hash
-	compactionChainTipHeight uint64
-	dkgPrivateKeysLock       sync.RWMutex
-	dkgPrivateKeys           map[uint64]*dkg.PrivateKey
-	persistantFilePath       string
+	blocksLock                 sync.RWMutex
+	blockHashSequence          common.Hashes
+	blocksByHash               map[common.Hash]*types.Block
+	compactionChainTipLock     sync.RWMutex
+	compactionChainTipHash     common.Hash
+	compactionChainTipHeight   uint64
+	dkgPrivateKeysLock         sync.RWMutex
+	dkgPrivateKeys             map[uint64]*dkg.PrivateKey
+	dkgMasterPrivateSharesLock sync.RWMutex
+	dkgMasterPrivateShares     map[uint64]*dkg.PrivateKeyShares
+	persistantFilePath         string
 }
 
 // NewMemBackedDB initialize a memory-backed database.
 func NewMemBackedDB(persistantFilePath ...string) (
 	dbInst *MemBackedDB, err error) {
 	dbInst = &MemBackedDB{
-		blockHashSequence: common.Hashes{},
-		blocksByHash:      make(map[common.Hash]*types.Block),
-		dkgPrivateKeys:    make(map[uint64]*dkg.PrivateKey),
+		blockHashSequence:      common.Hashes{},
+		blocksByHash:           make(map[common.Hash]*types.Block),
+		dkgPrivateKeys:         make(map[uint64]*dkg.PrivateKey),
+		dkgMasterPrivateShares: make(map[uint64]*dkg.PrivateKeyShares),
 	}
 	if len(persistantFilePath) == 0 || len(persistantFilePath[0]) == 0 {
 		return
@@ -197,6 +200,34 @@ func (m *MemBackedDB) PutDKGPrivateKey(
 	return nil
 }
 
+// HasDKGMasterPrivateShares check existence of DKG master private shares of one round.
+func (m *MemBackedDB) HasDKGMasterPrivateShares(round uint64) (bool, error) {
+	m.dkgMasterPrivateSharesLock.RLock()
+	defer m.dkgMasterPrivateSharesLock.RUnlock()
+	_, exists := m.dkgMasterPrivateShares[round]
+	return exists, nil
+}
+
+// GetDKGMasterPrivateShares get DKG master private shares of one round.
+func (m *MemBackedDB) GetDKGMasterPrivateShares(round uint64) (
+	dkg.PrivateKeyShares, error) {
+	m.dkgMasterPrivateSharesLock.RLock()
+	defer m.dkgMasterPrivateSharesLock.RUnlock()
+	if shares, exists := m.dkgMasterPrivateShares[round]; exists {
+		return *shares, nil
+	}
+	return dkg.PrivateKeyShares{}, ErrDKGMasterPrivateSharesDoesNotExist
+}
+
+// PutOrUpdateDKGMasterPrivateShares save DKG master private shares of one round.
+func (m *MemBackedDB) PutOrUpdateDKGMasterPrivateShares(
+	round uint64, shares dkg.PrivateKeyShares) error {
+	m.dkgMasterPrivateSharesLock.Lock()
+	defer m.dkgMasterPrivateSharesLock.Unlock()
+	m.dkgMasterPrivateShares[round] = &shares
+	return nil
+}
+
 // Close implement Closer interface, which would release allocated resource.
 func (m *MemBackedDB) Close() (err error) {
 	// Save internal state to a pretty-print json file. It's a temporary way
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/dkg-tsig-protocol.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/dkg-tsig-protocol.go
index 6c812db73..259d07a4b 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/dkg-tsig-protocol.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/dkg-tsig-protocol.go
@@ -24,6 +24,7 @@ import (
 	"github.com/dexon-foundation/dexon-consensus/common"
 	"github.com/dexon-foundation/dexon-consensus/core/crypto"
 	"github.com/dexon-foundation/dexon-consensus/core/crypto/dkg"
+	"github.com/dexon-foundation/dexon-consensus/core/db"
 	"github.com/dexon-foundation/dexon-consensus/core/types"
 	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
 	"github.com/dexon-foundation/dexon-consensus/core/utils"
@@ -164,6 +165,35 @@ func newDKGProtocol(
 	}
 }
 
+func recoverDKGProtocol(
+	ID types.NodeID,
+	recv dkgReceiver,
+	round uint64,
+	threshold int,
+	coreDB db.Database) (*dkgProtocol, error) {
+	shares, err := coreDB.GetDKGMasterPrivateShares(round)
+	if err != nil {
+		if err == db.ErrDKGMasterPrivateSharesDoesNotExist {
+			return nil, nil
+		}
+
+		return nil, err
+	}
+	return &dkgProtocol{
+		ID:                    ID,
+		recv:                  recv,
+		round:                 round,
+		threshold:             threshold,
+		idMap:                 make(map[types.NodeID]dkg.ID),
+		mpkMap:                make(map[types.NodeID]*dkg.PublicKeyShares),
+		masterPrivateShare:    &shares,
+		prvShares:             dkg.NewEmptyPrivateKeyShares(),
+		prvSharesReceived:     make(map[types.NodeID]struct{}),
+		nodeComplained:        make(map[types.NodeID]struct{}),
+		antiComplaintReceived: make(map[types.NodeID]map[types.NodeID]struct{}),
+	}, nil
+}
+
 func (d *dkgProtocol) processMasterPublicKeys(
 	mpks []*typesDKG.MasterPublicKey) (err error) {
 	d.idMap = make(map[types.NodeID]dkg.ID, len(mpks))
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/round-based-config.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/round-based-config.go
deleted file mode 100644
index 4f3a4cbf9..000000000
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/round-based-config.go
+++ /dev/null
@@ -1,51 +0,0 @@
-// Copyright 2018 The dexon-consensus Authors
-// This file is part of the dexon-consensus library.
-//
-// The dexon-consensus library is free software: you can redistribute it
-// and/or modify it under the terms of the GNU Lesser General Public License as
-// published by the Free Software Foundation, either version 3 of the License,
-// or (at your option) any later version.
-//
-// The dexon-consensus library is distributed in the hope that it will be
-// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
-// General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus library. If not, see
-// <http://www.gnu.org/licenses/>.
-
-package core
-
-import (
-	"fmt"
-
-	"github.com/dexon-foundation/dexon-consensus/core/types"
-)
-
-type roundBasedConfig struct {
-	roundID          uint64
-	roundBeginHeight uint64
-	roundEndHeight   uint64
-	roundInterval    uint64
-}
-
-func (config *roundBasedConfig) setupRoundBasedFields(
-	roundID uint64, cfg *types.Config) {
-	config.roundID = roundID
-	config.roundInterval = cfg.RoundLength
-}
-
-func (config *roundBasedConfig) setRoundBeginHeight(begin uint64) {
-	config.roundBeginHeight = begin
-	config.roundEndHeight = begin + config.roundInterval
-}
-
-// isLastBlock checks if a block is the last block of this round.
-func (config *roundBasedConfig) isLastBlock(b *types.Block) bool {
-	if b.Position.Round != config.roundID {
-		panic(fmt.Errorf("attempt to compare by different round: %s, %d",
-			b, config.roundID))
-	}
-	return b.Position.Height+1 == config.roundEndHeight
-}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/round-based-config.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/round-based-config.go
new file mode 100644
index 000000000..3219a1379
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/round-based-config.go
@@ -0,0 +1,112 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package utils
+
+import (
+	"fmt"
+
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+)
+
+// RoundBasedConfig is based config for rounds and provide boundary checking
+// for rounds.
+type RoundBasedConfig struct {
+	roundID          uint64
+	roundBeginHeight uint64
+	roundEndHeight   uint64
+	roundLength      uint64
+}
+
+// SetupRoundBasedFields setup round based fields, including round ID, the
+// length of rounds.
+func (c *RoundBasedConfig) SetupRoundBasedFields(
+	roundID uint64, cfg *types.Config) {
+	if c.roundLength > 0 {
+		panic(fmt.Errorf("duplicated set round based fields: %d",
+			c.roundLength))
+	}
+	c.roundID = roundID
+	c.roundLength = cfg.RoundLength
+}
+
+// SetRoundBeginHeight gives the beginning height for the initial round provided
+// when constructed.
+func (c *RoundBasedConfig) SetRoundBeginHeight(begin uint64) {
+	if c.roundBeginHeight != 0 {
+		panic(fmt.Errorf("duplicated set round begin height: %d",
+			c.roundBeginHeight))
+	}
+	c.roundBeginHeight = begin
+	c.roundEndHeight = begin + c.roundLength
+}
+
+// IsLastBlock checks if a block is the last block of this round.
+func (c *RoundBasedConfig) IsLastBlock(b *types.Block) bool {
+	if b.Position.Round != c.roundID {
+		panic(fmt.Errorf("attempt to compare by different round: %s, %d",
+			b, c.roundID))
+	}
+	return b.Position.Height+1 == c.roundEndHeight
+}
+
+// ExtendLength extends round ending height by the length of current round.
+func (c *RoundBasedConfig) ExtendLength() {
+	c.roundEndHeight += c.roundLength
+}
+
+// Contains checks if a block height is in this round.
+func (c *RoundBasedConfig) Contains(h uint64) bool {
+	return c.roundBeginHeight <= h && c.roundEndHeight > h
+}
+
+// RoundID returns the round ID of this config.
+func (c *RoundBasedConfig) RoundID() uint64 {
+	if c.roundLength == 0 {
+		panic(fmt.Errorf("config is not initialized: %d", c.roundID))
+	}
+	return c.roundID
+}
+
+// RoundEndHeight returns next checkpoint to varify if this round is ended.
+func (c *RoundBasedConfig) RoundEndHeight() uint64 {
+	if c.roundLength == 0 {
+		panic(fmt.Errorf("config is not initialized: %d", c.roundID))
+	}
+	return c.roundEndHeight
+}
+
+// AppendTo a config in previous round.
+func (c *RoundBasedConfig) AppendTo(other RoundBasedConfig) {
+	if c.roundID != other.roundID+1 {
+		panic(fmt.Errorf("round IDs of configs not continuous: %d %d",
+			c.roundID, other.roundID))
+	}
+	c.SetRoundBeginHeight(other.roundEndHeight)
+}
+
+// LastPeriodBeginHeight returns the begin height of last period. For example,
+// if a round is extended twice, then the return from this method is:
+//
+//    begin + 2 * roundLength - roundLength
+//
+func (c *RoundBasedConfig) LastPeriodBeginHeight() uint64 {
+	if c.roundLength == 0 {
+		panic(fmt.Errorf("config is not initialized: %d", c.roundID))
+	}
+	return c.roundEndHeight - c.roundLength
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/round-event.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/round-event.go
new file mode 100644
index 000000000..bab1d32d2
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/round-event.go
@@ -0,0 +1,302 @@
+// Copyright 2019 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package utils
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
+)
+
+// ErrUnmatchedBlockHeightWithGov is for invalid parameters for NewRoundEvent.
+type ErrUnmatchedBlockHeightWithGov struct {
+	round       uint64
+	reset       uint64
+	blockHeight uint64
+}
+
+func (e ErrUnmatchedBlockHeightWithGov) Error() string {
+	return fmt.Sprintf("unsynced block height and gov: round:%d reset:%d h:%d",
+		e.round, e.reset, e.blockHeight)
+}
+
+// RoundEventParam defines the parameters passed to event handlers of
+// RoundEvent.
+type RoundEventParam struct {
+	// 'Round' of next checkpoint, might be identical to previous checkpoint.
+	Round uint64
+	// the count of reset DKG for 'Round+1'.
+	Reset uint64
+	// the begin block height of this event, the end block height of this event
+	// would be BeginHeight + config.RoundLength.
+	BeginHeight uint64
+	// The configuration for 'Round'.
+	Config *types.Config
+	// The CRS for 'Round'.
+	CRS common.Hash
+}
+
+// NextRoundCheckpoint returns the height to check if the next round is ready.
+func (e RoundEventParam) NextRoundCheckpoint() uint64 {
+	return e.BeginHeight + e.Config.RoundLength*8/10
+}
+
+// roundEventFn defines the fingerprint of handlers of round events.
+type roundEventFn func([]RoundEventParam)
+
+// governanceAccessor is a subset of core.Governance to break the dependency
+// between core and utils package.
+type governanceAccessor interface {
+	// Configuration returns the configuration at a given round.
+	// Return the genesis configuration if round == 0.
+	Configuration(round uint64) *types.Config
+
+	// CRS returns the CRS for a given round.
+	// Return the genesis CRS if round == 0.
+	CRS(round uint64) common.Hash
+
+	// DKGComplaints gets all the DKGComplaints of round.
+	DKGComplaints(round uint64) []*typesDKG.Complaint
+
+	// DKGMasterPublicKeys gets all the DKGMasterPublicKey of round.
+	DKGMasterPublicKeys(round uint64) []*typesDKG.MasterPublicKey
+
+	// IsDKGFinal checks if DKG is final.
+	IsDKGFinal(round uint64) bool
+
+	// DKGResetCount returns the reset count for DKG of given round.
+	DKGResetCount(round uint64) uint64
+}
+
+// RoundEvent would be triggered when either:
+// - the next DKG set setup is ready.
+// - the next DKG set setup is failed, and previous DKG set already reset the
+//   CRS.
+type RoundEvent struct {
+	gov                     governanceAccessor
+	logger                  common.Logger
+	lock                    sync.Mutex
+	handlers                []roundEventFn
+	config                  RoundBasedConfig
+	lastTriggeredRound      uint64
+	lastTriggeredResetCount uint64
+	roundShift              uint64
+	ctx                     context.Context
+	ctxCancel               context.CancelFunc
+}
+
+// NewRoundEvent creates an RoundEvent instance.
+func NewRoundEvent(parentCtx context.Context, gov governanceAccessor,
+	logger common.Logger, initRound uint64,
+	initRoundBeginHeight, initBlockHeight uint64,
+	roundShift uint64) (*RoundEvent, error) {
+	// We need to generate valid ending block height of this round (taken
+	// DKG reset count into consideration).
+	e := &RoundEvent{
+		gov:                gov,
+		logger:             logger,
+		lastTriggeredRound: initRound,
+		roundShift:         roundShift,
+	}
+	e.ctx, e.ctxCancel = context.WithCancel(parentCtx)
+	e.config = RoundBasedConfig{}
+	e.config.SetupRoundBasedFields(initRound, GetConfigWithPanic(
+		gov, initRound, logger))
+	e.config.SetRoundBeginHeight(initRoundBeginHeight)
+	// Make sure the DKG reset count in current governance can cover the initial
+	// block height.
+	resetCount := gov.DKGResetCount(initRound + 1)
+	remains := resetCount
+	for ; resetCount > 0 && !e.config.Contains(initBlockHeight); remains-- {
+		e.config.ExtendLength()
+	}
+	if !e.config.Contains(initBlockHeight) {
+		return nil, ErrUnmatchedBlockHeightWithGov{
+			round:       initRound,
+			reset:       resetCount,
+			blockHeight: initBlockHeight,
+		}
+	}
+	e.lastTriggeredResetCount = resetCount - remains
+	return e, nil
+}
+
+// Register a handler to be called when new round is confirmed or new DKG reset
+// is detected.
+func (e *RoundEvent) Register(h roundEventFn) {
+	e.lock.Lock()
+	defer e.lock.Unlock()
+	e.handlers = append(e.handlers, h)
+}
+
+// ValidateNextRound validate if the DKG set for next round is ready to go or
+// failed to setup, all registered handlers would be called once some decision
+// is made on chain.
+//
+// This method would block until at least one event is triggered. Multiple
+// trigger in one call is possible.
+func (e *RoundEvent) ValidateNextRound(blockHeight uint64) {
+	// To make triggers continuous and sequential, the next validation should
+	// wait for previous one finishing. That's why I use mutex here directly.
+	var events []RoundEventParam
+	e.lock.Lock()
+	defer e.lock.Unlock()
+	e.logger.Info("ValidateNextRound",
+		"height", blockHeight,
+		"round", e.lastTriggeredRound,
+		"count", e.lastTriggeredResetCount)
+	defer func() {
+		if len(events) == 0 {
+			return
+		}
+		for _, h := range e.handlers {
+			// To make sure all handlers receive triggers sequentially, we can't
+			// raise go routines here.
+			h(events)
+		}
+	}()
+	startRound := e.lastTriggeredRound
+	for {
+		var (
+			dkgFailed, triggered bool
+			param                RoundEventParam
+			beginHeight          = blockHeight
+		)
+		for {
+			param, dkgFailed, triggered = e.check(beginHeight, startRound,
+				dkgFailed)
+			if !triggered {
+				break
+			}
+			events = append(events, param)
+			beginHeight = param.BeginHeight
+		}
+		if len(events) > 0 {
+			break
+		}
+		select {
+		case <-e.ctx.Done():
+			return
+		case <-time.After(500 * time.Millisecond):
+		}
+	}
+}
+
+func (e *RoundEvent) check(blockHeight, startRound uint64, lastDKGCheck bool) (
+	param RoundEventParam, dkgFailed bool, triggered bool) {
+	defer func() {
+		if !triggered {
+			return
+		}
+		// A simple assertion to make sure we didn't pick the wrong round.
+		if e.config.RoundID() != e.lastTriggeredRound {
+			panic(fmt.Errorf("triggered round not matched: %d, %d",
+				e.config.RoundID(), e.lastTriggeredRound))
+		}
+		param.Round = e.lastTriggeredRound
+		param.Reset = e.lastTriggeredResetCount
+		param.BeginHeight = e.config.LastPeriodBeginHeight()
+		param.CRS = GetCRSWithPanic(e.gov, e.lastTriggeredRound, e.logger)
+		param.Config = GetConfigWithPanic(e.gov, e.lastTriggeredRound, e.logger)
+		e.logger.Info("new RoundEvent triggered",
+			"round", e.lastTriggeredRound,
+			"reset", e.lastTriggeredResetCount,
+			"begin-height", e.config.LastPeriodBeginHeight(),
+			"crs", param.CRS.String()[:6],
+		)
+	}()
+	// Make sure current last config covers the blockHeight.
+	if !e.config.Contains(blockHeight) {
+		panic(ErrUnmatchedBlockHeightWithGov{
+			round:       e.lastTriggeredRound,
+			reset:       e.lastTriggeredResetCount,
+			blockHeight: blockHeight,
+		})
+	}
+	nextRound := e.lastTriggeredRound + 1
+	if nextRound >= startRound+e.roundShift {
+		// Avoid access configuration newer than last confirmed one over
+		// 'roundShift' rounds. Fullnode might crash if we access it before it
+		// knows.
+		return
+	}
+	nextCfg := GetConfigWithPanic(e.gov, nextRound, e.logger)
+	resetCount := e.gov.DKGResetCount(nextRound)
+	if resetCount > e.lastTriggeredResetCount {
+		e.lastTriggeredResetCount++
+		e.config.ExtendLength()
+		triggered = true
+		return
+	}
+	if lastDKGCheck {
+		// We know that DKG already failed, now wait for the DKG set from
+		// previous round to reset DKG and don't have to reconstruct the
+		// group public key again.
+		dkgFailed = true
+		return
+	}
+	if nextRound >= dkgDelayRound {
+		if !e.gov.IsDKGFinal(nextRound) {
+			e.logger.Debug("DKG is not final, waiting for DKG reset",
+				"round", nextRound,
+				"reset", e.lastTriggeredResetCount)
+			return
+		}
+		if _, err := typesDKG.NewGroupPublicKey(
+			nextRound,
+			e.gov.DKGMasterPublicKeys(nextRound),
+			e.gov.DKGComplaints(nextRound),
+			GetDKGThreshold(nextCfg)); err != nil {
+			e.logger.Debug(
+				"group public key setup failed, waiting for DKG reset",
+				"round", nextRound,
+				"reset", e.lastTriggeredResetCount)
+			dkgFailed = true
+			return
+		}
+	}
+	// The DKG set for next round is well prepared.
+	e.lastTriggeredRound = nextRound
+	e.lastTriggeredResetCount = 0
+	rCfg := RoundBasedConfig{}
+	rCfg.SetupRoundBasedFields(nextRound, nextCfg)
+	rCfg.AppendTo(e.config)
+	e.config = rCfg
+	triggered = true
+	return
+}
+
+// Stop the event source and block until last trigger returns.
+func (e *RoundEvent) Stop() {
+	e.ctxCancel()
+}
+
+// LastPeriod returns block height related info of the last period, including
+// begin height and round length.
+func (e *RoundEvent) LastPeriod() (begin uint64, length uint64) {
+	e.lock.Lock()
+	defer e.lock.Unlock()
+	begin = e.config.LastPeriodBeginHeight()
+	length = e.config.RoundEndHeight() - e.config.LastPeriodBeginHeight()
+	return
+}
diff --git a/vendor/vendor.json b/vendor/vendor.json
index bf03adcfb..12978a6cd 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -141,16 +141,16 @@
 		{
 			"checksumSHA1": "8EuKVkP1v/w5fRuuvUaXX5k/F+I=",
 			"path": "github.com/dexon-foundation/dexon-consensus/common",
-			"revision": "bdd9130c05828a158cb8088eec3561f8b1d0f956",
-			"revisionTime": "2019-03-12T03:51:26Z",
+			"revision": "8786160e28cf17c1125e26939b81ac59df5c260a",
+			"revisionTime": "2019-03-13T07:38:33Z",
 			"version": "single-chain",
 			"versionExact": "single-chain"
 		},
 		{
-			"checksumSHA1": "2Yi/kGqXHl5F7T3tGfDUS6UZ12I=",
+			"checksumSHA1": "ukcaBY+jnQSKyanW+y/uwysV+VM=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core",
-			"revision": "bdd9130c05828a158cb8088eec3561f8b1d0f956",
-			"revisionTime": "2019-03-12T03:51:26Z",
+			"revision": "8786160e28cf17c1125e26939b81ac59df5c260a",
+			"revisionTime": "2019-03-13T07:38:33Z",
 			"version": "single-chain",
 			"versionExact": "single-chain"
 		},
@@ -165,64 +165,64 @@
 		{
 			"checksumSHA1": "tQSbYCu5P00lUhKsx3IbBZCuSLY=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/crypto",
-			"revision": "bdd9130c05828a158cb8088eec3561f8b1d0f956",
-			"revisionTime": "2019-03-12T03:51:26Z",
+			"revision": "8786160e28cf17c1125e26939b81ac59df5c260a",
+			"revisionTime": "2019-03-13T07:38:33Z",
 			"version": "single-chain",
 			"versionExact": "single-chain"
 		},
 		{
-			"checksumSHA1": "vTI0nncFqZ052WvofDhFxLw1Bk4=",
+			"checksumSHA1": "kC/Tu4is9+jABI/EdvEv7VxwvEo=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/crypto/dkg",
-			"revision": "bdd9130c05828a158cb8088eec3561f8b1d0f956",
-			"revisionTime": "2019-03-12T03:51:26Z",
+			"revision": "8786160e28cf17c1125e26939b81ac59df5c260a",
+			"revisionTime": "2019-03-13T07:38:33Z",
 			"version": "single-chain",
 			"versionExact": "single-chain"
 		},
 		{
 			"checksumSHA1": "BhLKK8RveoLaeXc9UyUKMwQqchU=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa",
-			"revision": "bdd9130c05828a158cb8088eec3561f8b1d0f956",
-			"revisionTime": "2019-03-12T03:51:26Z",
+			"revision": "8786160e28cf17c1125e26939b81ac59df5c260a",
+			"revisionTime": "2019-03-13T07:38:33Z",
 			"version": "single-chain",
 			"versionExact": "single-chain"
 		},
 		{
-			"checksumSHA1": "zpuCdMT8MGsy4pLgHKpg/Wd4izU=",
+			"checksumSHA1": "dQOZYmiikmjWhwkUJc0QmCJnO9o=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/db",
-			"revision": "bdd9130c05828a158cb8088eec3561f8b1d0f956",
-			"revisionTime": "2019-03-12T03:51:26Z",
+			"revision": "8786160e28cf17c1125e26939b81ac59df5c260a",
+			"revisionTime": "2019-03-13T07:38:33Z",
 			"version": "single-chain",
 			"versionExact": "single-chain"
 		},
 		{
 			"checksumSHA1": "wN+K5gI8+j/7l3SB0DYZ8MkTAwo=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/syncer",
-			"revision": "bdd9130c05828a158cb8088eec3561f8b1d0f956",
-			"revisionTime": "2019-03-12T03:51:26Z",
+			"revision": "8786160e28cf17c1125e26939b81ac59df5c260a",
+			"revisionTime": "2019-03-13T07:38:33Z",
 			"version": "single-chain",
 			"versionExact": "single-chain"
 		},
 		{
 			"checksumSHA1": "id8imcgp3SqYhIx0k3Chd0VZrUQ=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/types",
-			"revision": "bdd9130c05828a158cb8088eec3561f8b1d0f956",
-			"revisionTime": "2019-03-12T03:51:26Z",
+			"revision": "8786160e28cf17c1125e26939b81ac59df5c260a",
+			"revisionTime": "2019-03-13T07:38:33Z",
 			"version": "single-chain",
 			"versionExact": "single-chain"
 		},
 		{
 			"checksumSHA1": "QXRBX9UmvX4wszA9qlyJtzYcTOw=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/types/dkg",
-			"revision": "bdd9130c05828a158cb8088eec3561f8b1d0f956",
-			"revisionTime": "2019-03-12T03:51:26Z",
+			"revision": "8786160e28cf17c1125e26939b81ac59df5c260a",
+			"revisionTime": "2019-03-13T07:38:33Z",
 			"version": "single-chain",
 			"versionExact": "single-chain"
 		},
 		{
-			"checksumSHA1": "AAHXrIvOxLg0CGKh5eKe9VcTOp0=",
+			"checksumSHA1": "Hg7KG7RnXK3Autq05xDxSIHKxXI=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/utils",
-			"revision": "bdd9130c05828a158cb8088eec3561f8b1d0f956",
-			"revisionTime": "2019-03-12T03:51:26Z",
+			"revision": "8786160e28cf17c1125e26939b81ac59df5c260a",
+			"revisionTime": "2019-03-13T07:38:33Z",
 			"version": "single-chain",
 			"versionExact": "single-chain"
 		},