Merge pull request #433 from harmony-one/rj_branch

Make drand as a service and make message passing work

api/proto/common.go

@@ -76,6 +76,14 @@ func GetConsensusMessagePayload(message []byte) ([]byte, error) {
 	return message[MessageCategoryBytes:], nil
 }
 
+// GetDRandMessagePayload gets the randomness message payload from the p2p message content
+func GetDRandMessagePayload(message []byte) ([]byte, error) {
+	if len(message) < MessageCategoryBytes {
+		return []byte{}, errors.New("failed to get message payload: no data available")
+	}
+	return message[MessageCategoryBytes:], nil
+}
+
 // ConstructConsensusMessage creates a message with the payload and returns as byte array.
 func ConstructConsensusMessage(payload []byte) []byte {
 	byteBuffer := bytes.NewBuffer([]byte{byte(Consensus)})

api/service/manager.go

@@ -25,6 +25,7 @@ const (
 	ClientSupport
 	SupportExplorer
 	Consensus
+	Randomness
 	BlockProposal
 	NetworkInfo
 	PeerDiscovery
@@ -43,6 +44,8 @@ func (t Type) String() string {
 		return "SupportExplorer"
 	case Consensus:
 		return "Consensus"
+	case Randomness:
+		return "Randomness"
 	case BlockProposal:
 		return "BlockProposal"
 	case NetworkInfo:

api/service/randgen/service.go

@@ -1,59 +0,0 @@
-package randgen
-
-import (
-	"github.com/harmony-one/harmony/internal/utils"
-)
-
-// Service is the random generation service.
-type Service struct {
-	stopChan    chan struct{}
-	stoppedChan chan struct{}
-}
-
-// New returns random generation service.
-func New() *Service {
-	return &Service{}
-}
-
-// StartService starts random generation service.
-func (s *Service) StartService() {
-	s.stopChan = make(chan struct{})
-	s.stoppedChan = make(chan struct{})
-
-	s.Init()
-	s.Run(s.stopChan, s.stoppedChan)
-}
-
-// Init initializes random generation.
-func (s *Service) Init() {
-}
-
-// Run runs random generation.
-func (s *Service) Run(stopChan chan struct{}, stoppedChan chan struct{}) {
-	go func() {
-		defer close(stoppedChan)
-		for {
-			select {
-			default:
-				utils.GetLogInstance().Info("Running random generation")
-				// Write some logic here.
-				s.DoRandomGeneration()
-			case <-stopChan:
-				return
-			}
-		}
-	}()
-}
-
-// DoRandomGeneration does random generation.
-func (s *Service) DoRandomGeneration() {
-
-}
-
-// StopService stops random generation service.
-func (s *Service) StopService() {
-	utils.GetLogInstance().Info("Stopping random generation service.")
-	s.stopChan <- struct{}{}
-	<-s.stoppedChan
-	utils.GetLogInstance().Info("Random generation stopped.")
-}

api/service/randomness/service.go

@@ -0,0 +1,33 @@
+package randomness
+
+import (
+	"github.com/harmony-one/harmony/drand"
+	"github.com/harmony-one/harmony/internal/utils"
+)
+
+// Service is the randomness generation service.
+type Service struct {
+	stopChan    chan struct{}
+	stoppedChan chan struct{}
+	DRand       *drand.DRand
+}
+
+// New returns randomness generation service.
+func New(dRand *drand.DRand) *Service {
+	return &Service{DRand: dRand}
+}
+
+// StartService starts randomness generation service.
+func (s *Service) StartService() {
+	s.stopChan = make(chan struct{})
+	s.stoppedChan = make(chan struct{})
+	s.DRand.WaitForEpochBlock(s.DRand.ConfirmedBlockChannel, s.stopChan, s.stoppedChan)
+}
+
+// StopService stops randomness generation service.
+func (s *Service) StopService() {
+	utils.GetLogInstance().Info("Stopping random generation service.")
+	s.stopChan <- struct{}{}
+	<-s.stoppedChan
+	utils.GetLogInstance().Info("Random generation stopped.")
+}

cmd/harmony.go

@@ -9,6 +9,8 @@ import (
 	"runtime"
 	"time"
 
+	"github.com/harmony-one/harmony/drand"
+
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/log"
 	peerstore "github.com/libp2p/go-libp2p-peerstore"
@@ -251,6 +253,7 @@ func main() {
 		} else {
 			currentNode.Role = node.BeaconValidator
 		}
+
 	} else {
 		if role == "leader" {
 			currentNode.Role = node.ShardLeader
@@ -259,6 +262,11 @@ func main() {
 		}
 	}
 
+	// Add randomness protocol
+	// TODO: enable drand only for beacon chain
+	dRand := drand.New(host, shardID, peers, leader, currentNode.ConfirmedBlockChannel)
+	currentNode.DRand = dRand
+
 	// If there is a client configured in the node list.
 	if clientPeer != nil {
 		currentNode.ClientPeer = clientPeer

consensus/consensus_leader.go

@@ -136,7 +136,7 @@ func (consensus *Consensus) processPrepareMessage(message consensus_proto.Messag
 	}
 
 	if len(prepareSigs) >= ((len(consensus.PublicKeys)*2)/3 + 1) {
-		utils.GetLogInstance().Debug("Received additional new prepare message", "validatorID", validatorID)
+		utils.GetLogInstance().Debug("Received additional prepare message", "validatorID", validatorID)
 		return
 	}
 
@@ -244,7 +244,6 @@ func (consensus *Consensus) processCommitMessage(message consensus_proto.Message
 		copy(blockObj.Header().CommitSignature[:], consensus.aggregatedCommitSig.Serialize()[:])
 		copy(blockObj.Header().CommitBitmap[:], consensus.commitBitmap.Bitmap)
 
-		consensus.OnConsensusDone(&blockObj)
 		consensus.state = targetState
 
 		select {
@@ -262,6 +261,7 @@ func (consensus *Consensus) processCommitMessage(message consensus_proto.Message
 		consensus.ResetState()
 		consensus.consensusID++
 
+		consensus.OnConsensusDone(&blockObj)
 		utils.GetLogInstance().Debug("HOORAY!!! CONSENSUS REACHED!!!", "consensusID", consensus.consensusID, "numOfSignatures", len(commitSigs))
 
 		// TODO: remove this temporary delay

drand/drand.go

@@ -7,6 +7,8 @@ import (
 	"strconv"
 	"sync"
 
+	"github.com/harmony-one/harmony/core/types"
+
 	protobuf "github.com/golang/protobuf/proto"
 	"github.com/harmony-one/bls/ffi/go/bls"
 	drand_proto "github.com/harmony-one/harmony/api/drand"
@@ -21,6 +23,7 @@ type DRand struct {
 	bitmap                *bls_cosi.Mask
 	pRand                 *[32]byte
 	rand                  *[32]byte
+	ConfirmedBlockChannel chan *types.Block // Channel for confirmed blocks
 
 	// map of nodeID to validator Peer object
 	// FIXME: should use PubKey of p2p.Peer as the hashkey
@@ -31,6 +34,7 @@ type DRand struct {
 
 	// Public keys of the committee including leader and validators
 	PublicKeys []*bls.PublicKey
+	pubKeyLock sync.Mutex
 
 	// private/public keys of current node
 	priKey *bls.SecretKey
@@ -53,10 +57,14 @@ type DRand struct {
 }
 
 // New creates a new dRand object
-func New(host p2p.Host, ShardID string, peers []p2p.Peer, leader p2p.Peer) *DRand {
+func New(host p2p.Host, ShardID string, peers []p2p.Peer, leader p2p.Peer, confirmedBlockChannel chan *types.Block) *DRand {
 	dRand := DRand{}
 	dRand.host = host
 
+	if confirmedBlockChannel != nil {
+		dRand.ConfirmedBlockChannel = confirmedBlockChannel
+	}
+
 	selfPeer := host.GetSelfPeer()
 	if leader.Port == selfPeer.Port && leader.IP == selfPeer.IP {
 		dRand.IsLeader = true
@@ -107,6 +115,24 @@ func New(host p2p.Host, ShardID string, peers []p2p.Peer, leader p2p.Peer) *DRan
 	return &dRand
 }
 
+// AddPeers adds new peers into the validator map of the consensus
+// and add the public keys
+func (dRand *DRand) AddPeers(peers []*p2p.Peer) int {
+	count := 0
+
+	for _, peer := range peers {
+		_, ok := dRand.validators.Load(utils.GetUniqueIDFromPeer(*peer))
+		if !ok {
+			dRand.validators.Store(utils.GetUniqueIDFromPeer(*peer), *peer)
+			dRand.pubKeyLock.Lock()
+			dRand.PublicKeys = append(dRand.PublicKeys, peer.PubKey)
+			dRand.pubKeyLock.Unlock()
+		}
+		count++
+	}
+	return count
+}
+
 // Sign on the drand message signature field.
 func (dRand *DRand) signDRandMessage(message *drand_proto.Message) error {
 	message.Signature = nil
@@ -192,3 +218,13 @@ func (dRand *DRand) getValidatorPeerByID(validatorID uint32) *p2p.Peer {
 	}
 	return &value
 }
+
+// ResetState resets the state of the randomness protocol
+func (dRand *DRand) ResetState() {
+	dRand.vrfs = &map[uint32][]byte{}
+
+	bitmap, _ := bls_cosi.NewMask(dRand.PublicKeys, dRand.leader.PubKey)
+	dRand.bitmap = bitmap
+	dRand.pRand = nil
+	dRand.rand = nil
+}

drand/drand_leader.go

@@ -15,10 +15,8 @@ func (dRand *DRand) WaitForEpochBlock(blockChannel chan *types.Block, stopChan c
 		for {
 			select {
 			default:
-				// keep waiting for new blocks
+				// keep waiting for epoch block
 				newBlock := <-blockChannel
-				// TODO: think about potential race condition
-
 				dRand.init(newBlock)
 			case <-stopChan:
 				return
@@ -28,6 +26,8 @@ func (dRand *DRand) WaitForEpochBlock(blockChannel chan *types.Block, stopChan c
 }
 
 func (dRand *DRand) init(epochBlock *types.Block) {
+	utils.GetLogInstance().Debug("INITING DRAND")
+	dRand.ResetState()
 	// Copy over block hash and block header data
 	blockHash := epochBlock.Hash()
 	copy(dRand.blockHash[:], blockHash[:])
@@ -66,8 +66,16 @@ func (dRand *DRand) processCommitMessage(message drand_proto.Message) {
 		return
 	}
 
+	validatorID := message.SenderId
+	validatorPeer := dRand.getValidatorPeerByID(validatorID)
+	vrfs := dRand.vrfs
+	if len((*vrfs)) >= ((len(dRand.PublicKeys))/3 + 1) {
+		utils.GetLogInstance().Debug("Received additional randomness commit message", "validatorID", validatorID)
+		return
+	}
+
 	// Verify message signature
-	err := verifyMessageSig(dRand.leader.PubKey, message)
+	err := verifyMessageSig(validatorPeer.PubKey, message)
 	if err != nil {
 		utils.GetLogInstance().Warn("Failed to verify the message signature", "Error", err)
 		return
@@ -79,15 +87,14 @@ func (dRand *DRand) processCommitMessage(message drand_proto.Message) {
 	_ = proof
 	// TODO: check the validity of the vrf commit
 
-	validatorID := message.SenderId
-	validatorPeer := dRand.getValidatorPeerByID(validatorID)
-	vrfs := dRand.vrfs
-	utils.GetLogInstance().Debug("Received new prepare signature", "numReceivedSoFar", len((*vrfs)), "validatorID", validatorID, "PublicKeys", len(dRand.PublicKeys))
+	utils.GetLogInstance().Debug("Received new commit", "numReceivedSoFar", len((*vrfs)), "validatorID", validatorID, "PublicKeys", len(dRand.PublicKeys))
 
 	(*vrfs)[validatorID] = message.Payload
 	dRand.bitmap.SetKey(validatorPeer.PubKey, true) // Set the bitmap indicating that this validator signed.
 
 	if len((*vrfs)) >= ((len(dRand.PublicKeys))/3 + 1) {
 		// Construct pRand and initiate consensus on it
+		utils.GetLogInstance().Debug("Received enough randomness commit", "numReceivedSoFar", len((*vrfs)), "validatorID", validatorID, "PublicKeys", len(dRand.PublicKeys))
+		// TODO: communicate the pRand to consensus
 	}
 }

drand/drand_leader_msg.go

@@ -7,13 +7,14 @@ import (
 )
 
 // Constructs the init message
-func (drand *DRand) constructInitMessage() []byte {
+func (dRand *DRand) constructInitMessage() []byte {
 	message := drand_proto.Message{}
 	message.Type = drand_proto.MessageType_INIT
+	message.SenderId = dRand.nodeID
 
-	message.BlockHash = drand.blockHash[:]
+	message.BlockHash = dRand.blockHash[:]
 	// Don't need the payload in init message
-	marshaledMessage, err := drand.signAndMarshalDRandMessage(&message)
+	marshaledMessage, err := dRand.signAndMarshalDRandMessage(&message)
 	if err != nil {
 		utils.GetLogInstance().Error("Failed to sign and marshal the init message", "error", err)
 	}

drand/drand_leader_msg_test.go

@@ -16,11 +16,11 @@ func TestConstructInitMessage(test *testing.T) {
 	if err != nil {
 		test.Fatalf("newhost failure: %v", err)
 	}
-	dRand := New(host, "0", []p2p.Peer{leader, validator}, leader)
+	dRand := New(host, "0", []p2p.Peer{leader, validator}, leader, nil)
 	dRand.blockHash = [32]byte{}
 	msg := dRand.constructInitMessage()
 
-	if len(msg) != 87 {
+	if len(msg) != 93 {
 		test.Errorf("Init message is not constructed in the correct size: %d", len(msg))
 	}
 }

drand/drand_test.go

@@ -16,7 +16,7 @@ func TestNew(test *testing.T) {
 	if err != nil {
 		test.Fatalf("newhost failure: %v", err)
 	}
-	dRand := New(host, "0", []p2p.Peer{leader, validator}, leader)
+	dRand := New(host, "0", []p2p.Peer{leader, validator}, leader, nil)
 
 	if !dRand.IsLeader {
 		test.Error("dRand should belong to a leader")

drand/drand_validator.go

@@ -17,7 +17,7 @@ func (dRand *DRand) ProcessMessageValidator(payload []byte) {
 	}
 
 	switch message.Type {
-	case drand_proto.MessageType_COMMIT:
+	case drand_proto.MessageType_INIT:
 		dRand.processInitMessage(message)
 	default:
 		utils.GetLogInstance().Error("Unexpected message type", "msgType", message.Type, "dRand", dRand)

drand/drand_validator_msg.go

@@ -7,14 +7,15 @@ import (
 )
 
 // Constructs the init message
-func (drand *DRand) constructCommitMessage(vrf [32]byte, proof []byte) []byte {
+func (dRand *DRand) constructCommitMessage(vrf [32]byte, proof []byte) []byte {
 	message := drand_proto.Message{}
 	message.Type = drand_proto.MessageType_COMMIT
+	message.SenderId = dRand.nodeID
 
-	message.BlockHash = drand.blockHash[:]
+	message.BlockHash = dRand.blockHash[:]
 	message.Payload = append(vrf[:], proof...)
 
-	marshaledMessage, err := drand.signAndMarshalDRandMessage(&message)
+	marshaledMessage, err := dRand.signAndMarshalDRandMessage(&message)
 	if err != nil {
 		utils.GetLogInstance().Error("Failed to sign and marshal the commit message", "error", err)
 	}

drand/drand_validator_msg_test.go

@@ -16,11 +16,11 @@ func TestConstructCommitMessage(test *testing.T) {
 	if err != nil {
 		test.Fatalf("newhost failure: %v", err)
 	}
-	dRand := New(host, "0", []p2p.Peer{leader, validator}, leader)
+	dRand := New(host, "0", []p2p.Peer{leader, validator}, leader, nil)
 	dRand.blockHash = [32]byte{}
 	msg := dRand.constructCommitMessage([32]byte{}, []byte{})
 
-	if len(msg) != 121 {
+	if len(msg) != 127 {
 		test.Errorf("Commit message is not constructed in the correct size: %d", len(msg))
 	}
 }

node/node.go

@@ -12,6 +12,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/harmony-one/harmony/drand"
+
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/ethdb"
@@ -28,6 +30,7 @@ import (
 	"github.com/harmony-one/harmony/api/service/discovery"
 	"github.com/harmony-one/harmony/api/service/explorer"
 	"github.com/harmony-one/harmony/api/service/networkinfo"
+	randomness_service "github.com/harmony-one/harmony/api/service/randomness"
 	"github.com/harmony-one/harmony/api/service/staking"
 	"github.com/harmony-one/harmony/api/service/syncing"
 	"github.com/harmony-one/harmony/api/service/syncing/downloader"
@@ -116,10 +119,12 @@ type syncConfig struct {
 // Node represents a protocol-participating node in the network
 type Node struct {
 	Consensus              *bft.Consensus       // Consensus object containing all Consensus related data (e.g. committee members, signatures, commits)
-	BlockChannel           chan *types.Block    // The channel to receive new blocks from Node
+	BlockChannel           chan *types.Block    // The channel to send newly proposed blocks
+	ConfirmedBlockChannel  chan *types.Block    // The channel to send confirmed blocks
 	pendingTransactions    types.Transactions   // All the transactions received but not yet processed for Consensus
 	transactionInConsensus []*types.Transaction // The transactions selected into the new block and under Consensus process
 	pendingTxMutex         sync.Mutex
+	DRand                  *drand.DRand // The instance for distributed randomness protocol
 
 	blockchain *core.BlockChain   // The blockchain for the shard where this node belongs
 	db         *ethdb.LDBDatabase // LevelDB to store blockchain.
@@ -267,6 +272,7 @@ func New(host p2p.Host, consensus *bft.Consensus, db ethdb.Database) *Node {
 		chain, _ := core.NewBlockChain(database, nil, gspec.Config, node.Consensus, vm.Config{}, nil)
 		node.blockchain = chain
 		node.BlockChannel = make(chan *types.Block)
+		node.ConfirmedBlockChannel = make(chan *types.Block)
 		node.TxPool = core.NewTxPool(core.DefaultTxPoolConfig, params.TestChainConfig, chain)
 		node.Worker = worker.New(params.TestChainConfig, chain, node.Consensus, pki.GetAddressFromPublicKey(node.SelfPeer.PubKey), node.Consensus.ShardID)
 		node.AddFaucetContractToPendingTransactions()
@@ -406,6 +412,8 @@ func (node *Node) AddPeers(peers []*p2p.Peer) int {
 
 	if count > 0 {
 		node.Consensus.AddPeers(peers)
+		// TODO: make peers into a context object shared by consensus and drand
+		node.DRand.AddPeers(peers)
 	}
 	return count
 }
@@ -673,6 +681,8 @@ func (node *Node) setupForShardLeader() {
 	node.serviceManager.RegisterService(service_manager.BlockProposal, blockproposal.New(node.Consensus.ReadySignal, node.WaitForConsensusReady))
 	// Register client support service.
 	node.serviceManager.RegisterService(service_manager.ClientSupport, clientsupport.New(node.blockchain.State, node.CallFaucetContract, node.getDeployedStakingContract, node.SelfPeer.IP, node.SelfPeer.Port))
+	// Register randomness service
+	node.serviceManager.RegisterService(service_manager.Randomness, randomness_service.New(node.DRand))
 }
 
 func (node *Node) setupForShardValidator() {
@@ -699,6 +709,9 @@ func (node *Node) setupForBeaconLeader() {
 	node.serviceManager.RegisterService(service_manager.BlockProposal, blockproposal.New(node.Consensus.ReadySignal, node.WaitForConsensusReady))
 	// Register client support service.
 	node.serviceManager.RegisterService(service_manager.ClientSupport, clientsupport.New(node.blockchain.State, node.CallFaucetContract, node.getDeployedStakingContract, node.SelfPeer.IP, node.SelfPeer.Port))
+	// Register randomness service
+	node.serviceManager.RegisterService(service_manager.Randomness, randomness_service.New(node.DRand))
+
 }
 
 func (node *Node) setupForBeaconValidator() {
@@ -715,6 +728,8 @@ func (node *Node) setupForBeaconValidator() {
 	node.serviceManager.RegisterService(service_manager.PeerDiscovery, discovery.New(node.host, "0", chanPeer, nil))
 	// Register networkinfo service. "0" is the beacon shard ID
 	node.serviceManager.RegisterService(service_manager.NetworkInfo, networkinfo.New(node.host, "0", chanPeer))
+	// Register randomness service
+	node.serviceManager.RegisterService(service_manager.Randomness, randomness_service.New(node.DRand))
 }
 
 func (node *Node) setupForNewNode() {

node/node_handler.go

@@ -117,6 +117,17 @@ func (node *Node) messageHandler(content []byte) {
 			// TODO(minhdoan): add logic to check if the current blockchain is not sync with other consensus
 			// we should switch to other state rather than DoingConsensus.
 		}
+	case proto.DRand:
+		msgPayload, _ := proto.GetDRandMessagePayload(content)
+		if node.DRand != nil {
+			if node.DRand.IsLeader {
+				utils.GetLogInstance().Info("NET: DRand Leader received message:", "messageCategory", msgCategory, "messageType", msgType)
+				node.DRand.ProcessMessageLeader(msgPayload)
+			} else {
+				utils.GetLogInstance().Info("NET: DRand Validator received message:", "messageCategory", msgCategory, "messageType", msgType)
+				node.DRand.ProcessMessageValidator(msgPayload)
+			}
+		}
 	case proto.Node:
 		actionType := proto_node.MessageType(msgType)
 		switch actionType {
@@ -248,6 +259,13 @@ func (node *Node) PostConsensusProcessing(newBlock *types.Block) {
 		node.BroadcastNewBlock(newBlock)
 	}
 	node.AddNewBlock(newBlock)
+
+	// TODO: enable drand only for beacon chain
+	if node.DRand != nil {
+		go func() {
+			node.ConfirmedBlockChannel <- newBlock
+		}()
+	}
 }
 
 // AddNewBlock is usedd to add new block into the blockchain.

node/node_test.go

@@ -7,6 +7,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/harmony-one/harmony/drand"
+
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/params"
@@ -97,8 +99,10 @@ func TestAddPeers(t *testing.T) {
 		t.Fatalf("newhost failure: %v", err)
 	}
 	consensus := consensus.New(host, "0", []p2p.Peer{leader, validator}, leader)
+	dRand := drand.New(host, "0", []p2p.Peer{leader, validator}, leader, nil)
 
 	node := New(host, consensus, nil)
+	node.DRand = dRand
 	r1 := node.AddPeers(peers1)
 	e1 := 2
 	if r1 != e1 {