clean up

consensus/consensus_validator.go

@@ -16,7 +16,7 @@ import (
 )
 
 // Validator's consensus message dispatcher
-func (consensus *Consensus) ProcessMessageValidator(message []byte, blockSyncing chan struct{}, syncNode bool) {
+func (consensus *Consensus) ProcessMessageValidator(message []byte) {
 	msgType, err := proto_consensus.GetConsensusMessageType(message)
 	if err != nil {
 		consensus.Log.Error("Failed to get consensus message type", "err", err, "consensus", consensus)
@@ -27,10 +27,6 @@ func (consensus *Consensus) ProcessMessageValidator(message []byte, blockSyncing
 		consensus.Log.Error("Failed to get consensus message payload", "err", err, "consensus", consensus)
 	}
 
-	if syncNode {
-		blockSyncing <- struct{}{}
-		return
-	}
 	switch msgType {
 	case proto_consensus.ANNOUNCE:
 		consensus.processAnnounceMessage(payload)

node/node.go

@@ -34,14 +34,12 @@ type Node struct {
 	log                    log.Logger                         // Log utility
 	pendingTxMutex         sync.Mutex
 	crossTxToReturnMutex   sync.Mutex
-	blockSyncing           chan struct{}
-	doneSyncing            chan struct{}
 	ClientPeer             *p2p.Peer      // The peer for the benchmark tx generator client, used for leaders to return proof-of-accept
 	Client                 *client.Client // The presence of a client object means this node will also act as a client
 	IsWaiting              bool
 	Self                   p2p.Peer
 	IDCPeer                p2p.Peer
-	syncNode               bool // TODO(minhdoan): Remove it later.
+	SyncNode               bool // TODO(minhdoan): Remove it later.
 }
 
 // Add new crossTx and proofs to the list of crossTx that needs to be sent back to client
@@ -73,6 +71,9 @@ func (node *Node) getTransactionsForNewBlock(maxNumTxs int) ([]*blockchain.Trans
 
 // Start a server and process the request by a handler.
 func (node *Node) StartServer(port string) {
+	if node.SyncNode {
+		node.startBlockSyncing()
+	}
 	fmt.Println("Hello in server now")
 	node.log.Debug("Starting server", "node", node, "port", port)
 
@@ -91,24 +92,17 @@ func (node *Node) listenOnPort(port string) {
 		return
 	}
 	for {
-		select {
-		case <-node.blockSyncing:
-			// Wait until the syncing part gets finished.
-			node.startBlockSyncing()
-			<-node.doneSyncing
-		default:
-			conn, err := listen.Accept()
-			if err != nil {
-				node.log.Error("Error listening on port.", "port", port)
-				continue
-			}
-			go node.NodeHandler(conn)
+		conn, err := listen.Accept()
+		if err != nil {
+			node.log.Error("Error listening on port.", "port", port)
+			continue
 		}
+		go node.NodeHandler(conn)
 	}
 }
 func (node *Node) startBlockSyncing() {
-	// TODO(minhdoan):
 	for {
+
 	}
 }
 
@@ -245,10 +239,6 @@ func New(consensus *consensus.Consensus, db *db.LDBDatabase) *Node {
 
 		// Initialize level db.
 		node.db = db
-
-		// Initialize channel for syncing.
-		node.doneSyncing = make(chan struct{})
-		node.blockSyncing = make(chan struct{})
 	}
 	// Logger
 	node.log = log.New()

node/node_handler.go

@@ -1,6 +1,7 @@
 package node
 
 import (
+	"bufio"
 	"bytes"
 	"encoding/gob"
 	"fmt"
@@ -77,7 +78,7 @@ func (node *Node) NodeHandler(conn net.Conn) {
 			if consensusObj.IsLeader {
 				consensusObj.ProcessMessageLeader(msgPayload)
 			} else {
-				consensusObj.ProcessMessageValidator(msgPayload, node.blockSyncing, node.syncNode)
+				consensusObj.ProcessMessageValidator(msgPayload)
 			}
 		}
 	case proto.NODE:
@@ -97,7 +98,7 @@ func (node *Node) NodeHandler(conn net.Conn) {
 				}
 			}
 		case proto_node.BLOCKCHAIN_SYNC:
-			node.handleBlockchainSync(conn)
+			node.handleBlockchainSync(msgPayload, conn)
 		case proto_node.CLIENT:
 			clientMsgType := proto_node.ClientMessageType(msgPayload[0])
 			switch clientMsgType {
@@ -168,9 +169,12 @@ func (node *Node) NodeHandler(conn net.Conn) {
 	}
 }
 
-func (node *Node) handleBlockchainSync(conn net.Conn) {
-	for {
-
+func (node *Node) handleBlockchainSync(payload []byte, conn net.Conn) {
+	// TODO(minhdoan): Looking to removing this.
+	w := bufio.NewWriter(conn)
+	for _, block := range node.blockchain.Blocks {
+		w.Write(block.Serialize())
+		w.Flush()
 	}
 }
 

proto/node/node.go

@@ -97,6 +97,14 @@ func ConstructTransactionListMessage(transactions []*blockchain.Transaction) []b
 	return byteBuffer.Bytes()
 }
 
+// Constructs Blockchain Sync Message.
+func ConstructBlockchainSyncMessage(blockHash [32]byte) []byte {
+	byteBuffer := bytes.NewBuffer([]byte{byte(proto.NODE)})
+	byteBuffer.WriteByte(byte(BLOCKCHAIN_SYNC))
+	byteBuffer.Write(blockHash[:])
+	return byteBuffer.Bytes()
+}
+
 // Constructs serialized transactions
 func ConstructRequestTransactionsMessage(transactionIds [][]byte) []byte {
 	byteBuffer := bytes.NewBuffer([]byte{byte(proto.NODE)})