[HAR-49] Create grpc service for client wallet and implement basic balance check

[HAR-49] Create grpc service for client wallet and implement basic balance check

benchmark.go

@@ -226,5 +226,8 @@ func main() {
 	}
 
 	go currentNode.SupportSyncing()
+	if consensus.IsLeader {
+		go currentNode.SupportClient()
+	}
 	currentNode.StartServer()
 }

client/service/client.go

@@ -0,0 +1,52 @@
+package client
+
+import (
+	"context"
+	"fmt"
+	"github.com/ethereum/go-ethereum/common"
+	proto "github.com/harmony-one/harmony/client/service/proto"
+	"log"
+	"time"
+
+	"google.golang.org/grpc"
+)
+
+// Client is the client model for downloader package.
+type Client struct {
+	clientServiceClient proto.ClientServiceClient
+	opts                []grpc.DialOption
+	conn                *grpc.ClientConn
+}
+
+// NewClient setups a Client given ip and port.
+func NewClient(ip, port string) *Client {
+	client := Client{}
+	client.opts = append(client.opts, grpc.WithInsecure())
+	var err error
+	client.conn, err = grpc.Dial(fmt.Sprintf("%s:%s", ip, port), client.opts...)
+	if err != nil {
+		log.Fatalf("fail to dial: %v", err)
+		return nil
+	}
+
+	client.clientServiceClient = proto.NewClientServiceClient(client.conn)
+	return &client
+}
+
+// Close closes the Client.
+func (client *Client) Close() {
+	client.conn.Close()
+}
+
+// GetBalance gets block hashes from all the peers by calling grpc request.
+func (client *Client) GetBalance(address common.Address) *proto.FetchAccountStateResponse {
+	log.Println("Getting balance from address: ", address.Hex())
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	request := &proto.FetchAccountStateRequest{Address: address.Bytes()}
+	response, err := client.clientServiceClient.FetchAccountState(ctx, request)
+	if err != nil {
+		log.Fatalf("Error getting balance: %s", err)
+	}
+	return response
+}

client/service/proto/client.pb.go

@@ -0,0 +1,208 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: client.proto
+
+package client
+
+import (
+	context "context"
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	grpc "google.golang.org/grpc"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// FetchAccountStateRequest is the request to fetch an account's balance and nonce.
+type FetchAccountStateRequest struct {
+	// The account address
+	Address              []byte   `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *FetchAccountStateRequest) Reset()         { *m = FetchAccountStateRequest{} }
+func (m *FetchAccountStateRequest) String() string { return proto.CompactTextString(m) }
+func (*FetchAccountStateRequest) ProtoMessage()    {}
+func (*FetchAccountStateRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_014de31d7ac8c57c, []int{0}
+}
+
+func (m *FetchAccountStateRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_FetchAccountStateRequest.Unmarshal(m, b)
+}
+func (m *FetchAccountStateRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_FetchAccountStateRequest.Marshal(b, m, deterministic)
+}
+func (m *FetchAccountStateRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_FetchAccountStateRequest.Merge(m, src)
+}
+func (m *FetchAccountStateRequest) XXX_Size() int {
+	return xxx_messageInfo_FetchAccountStateRequest.Size(m)
+}
+func (m *FetchAccountStateRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_FetchAccountStateRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_FetchAccountStateRequest proto.InternalMessageInfo
+
+func (m *FetchAccountStateRequest) GetAddress() []byte {
+	if m != nil {
+		return m.Address
+	}
+	return nil
+}
+
+// FetchAccountStateResponse is the response of FetchAccountStateRequest.
+type FetchAccountStateResponse struct {
+	// The balance of the account (big.Int)
+	Balance []byte `protobuf:"bytes,1,opt,name=balance,proto3" json:"balance,omitempty"`
+	// The nonce of the account
+	Nonce                uint64   `protobuf:"varint,2,opt,name=nonce,proto3" json:"nonce,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *FetchAccountStateResponse) Reset()         { *m = FetchAccountStateResponse{} }
+func (m *FetchAccountStateResponse) String() string { return proto.CompactTextString(m) }
+func (*FetchAccountStateResponse) ProtoMessage()    {}
+func (*FetchAccountStateResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_014de31d7ac8c57c, []int{1}
+}
+
+func (m *FetchAccountStateResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_FetchAccountStateResponse.Unmarshal(m, b)
+}
+func (m *FetchAccountStateResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_FetchAccountStateResponse.Marshal(b, m, deterministic)
+}
+func (m *FetchAccountStateResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_FetchAccountStateResponse.Merge(m, src)
+}
+func (m *FetchAccountStateResponse) XXX_Size() int {
+	return xxx_messageInfo_FetchAccountStateResponse.Size(m)
+}
+func (m *FetchAccountStateResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_FetchAccountStateResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_FetchAccountStateResponse proto.InternalMessageInfo
+
+func (m *FetchAccountStateResponse) GetBalance() []byte {
+	if m != nil {
+		return m.Balance
+	}
+	return nil
+}
+
+func (m *FetchAccountStateResponse) GetNonce() uint64 {
+	if m != nil {
+		return m.Nonce
+	}
+	return 0
+}
+
+func init() {
+	proto.RegisterType((*FetchAccountStateRequest)(nil), "client.FetchAccountStateRequest")
+	proto.RegisterType((*FetchAccountStateResponse)(nil), "client.FetchAccountStateResponse")
+}
+
+func init() { proto.RegisterFile("client.proto", fileDescriptor_014de31d7ac8c57c) }
+
+var fileDescriptor_014de31d7ac8c57c = []byte{
+	// 172 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0xe2, 0x49, 0xce, 0xc9, 0x4c,
+	0xcd, 0x2b, 0xd1, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0x62, 0x83, 0xf0, 0x94, 0x4c, 0xb8, 0x24,
+	0xdc, 0x52, 0x4b, 0x92, 0x33, 0x1c, 0x93, 0x93, 0xf3, 0x4b, 0xf3, 0x4a, 0x82, 0x4b, 0x12, 0x4b,
+	0x52, 0x83, 0x52, 0x0b, 0x4b, 0x53, 0x8b, 0x4b, 0x84, 0x24, 0xb8, 0xd8, 0x13, 0x53, 0x52, 0x8a,
+	0x52, 0x8b, 0x8b, 0x25, 0x18, 0x15, 0x18, 0x35, 0x78, 0x82, 0x60, 0x5c, 0x25, 0x6f, 0x2e, 0x49,
+	0x2c, 0xba, 0x8a, 0x0b, 0xf2, 0xf3, 0x8a, 0x53, 0x41, 0xda, 0x92, 0x12, 0x73, 0x12, 0xf3, 0x92,
+	0x53, 0x61, 0xda, 0xa0, 0x5c, 0x21, 0x11, 0x2e, 0xd6, 0xbc, 0x7c, 0x90, 0x38, 0x93, 0x02, 0xa3,
+	0x06, 0x4b, 0x10, 0x84, 0x63, 0x94, 0xcd, 0xc5, 0xeb, 0x0c, 0x76, 0x4c, 0x70, 0x6a, 0x51, 0x59,
+	0x66, 0x72, 0xaa, 0x50, 0x14, 0x97, 0x20, 0x86, 0xe9, 0x42, 0x0a, 0x7a, 0x50, 0xf7, 0xe3, 0x72,
+	0xae, 0x94, 0x22, 0x1e, 0x15, 0x10, 0xa7, 0x29, 0x31, 0x24, 0xb1, 0x81, 0xbd, 0x6f, 0x0c, 0x08,
+	0x00, 0x00, 0xff, 0xff, 0x2a, 0x07, 0xa9, 0xb6, 0x0e, 0x01, 0x00, 0x00,
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConn
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion4
+
+// ClientServiceClient is the client API for ClientService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
+type ClientServiceClient interface {
+	FetchAccountState(ctx context.Context, in *FetchAccountStateRequest, opts ...grpc.CallOption) (*FetchAccountStateResponse, error)
+}
+
+type clientServiceClient struct {
+	cc *grpc.ClientConn
+}
+
+func NewClientServiceClient(cc *grpc.ClientConn) ClientServiceClient {
+	return &clientServiceClient{cc}
+}
+
+func (c *clientServiceClient) FetchAccountState(ctx context.Context, in *FetchAccountStateRequest, opts ...grpc.CallOption) (*FetchAccountStateResponse, error) {
+	out := new(FetchAccountStateResponse)
+	err := c.cc.Invoke(ctx, "/client.ClientService/FetchAccountState", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ClientServiceServer is the server API for ClientService service.
+type ClientServiceServer interface {
+	FetchAccountState(context.Context, *FetchAccountStateRequest) (*FetchAccountStateResponse, error)
+}
+
+func RegisterClientServiceServer(s *grpc.Server, srv ClientServiceServer) {
+	s.RegisterService(&_ClientService_serviceDesc, srv)
+}
+
+func _ClientService_FetchAccountState_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(FetchAccountStateRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ClientServiceServer).FetchAccountState(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/client.ClientService/FetchAccountState",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ClientServiceServer).FetchAccountState(ctx, req.(*FetchAccountStateRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _ClientService_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "client.ClientService",
+	HandlerType: (*ClientServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "FetchAccountState",
+			Handler:    _ClientService_FetchAccountState_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "client.proto",
+}

client/service/proto/client.proto

@@ -0,0 +1,22 @@
+syntax = "proto3";
+
+package client;
+
+// Client is the service used for any client-facing requests.
+service ClientService {
+  rpc FetchAccountState(FetchAccountStateRequest) returns (FetchAccountStateResponse) {}
+}
+
+// FetchAccountStateRequest is the request to fetch an account's balance and nonce.
+message FetchAccountStateRequest {
+  // The account address
+  bytes address = 1;
+}
+
+// FetchAccountStateResponse is the response of FetchAccountStateRequest.
+message FetchAccountStateResponse {
+  // The balance of the account (big.Int)
+  bytes balance = 1;
+  // The nonce of the account
+  uint64 nonce = 2;
+}

client/service/server.go

@@ -0,0 +1,52 @@
+package client
+
+import (
+	"context"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/harmony-one/harmony/core/state"
+	"log"
+	"net"
+
+	"google.golang.org/grpc"
+
+	proto "github.com/harmony-one/harmony/client/service/proto"
+)
+
+// Constants for downloader server.
+const (
+	DefaultDownloadPort = "6666"
+)
+
+// Server is the Server struct for downloader package.
+type Server struct {
+	state *state.StateDB
+}
+
+// FetchAccountState implements the FetchAccountState interface to return account state.
+func (s *Server) FetchAccountState(ctx context.Context, request *proto.FetchAccountStateRequest) (*proto.FetchAccountStateResponse, error) {
+	var address common.Address
+	address.SetBytes(request.Address)
+	log.Println("Returning FetchAccountStateResponse for address: ", address.Hex())
+	return &proto.FetchAccountStateResponse{Balance: s.state.GetBalance(address).Bytes(), Nonce: s.state.GetNonce(address)}, nil
+}
+
+// Start starts the Server on given ip and port.
+func (s *Server) Start(ip, port string) (*grpc.Server, error) {
+	// TODO(minhdoan): Currently not using ip. Fix it later.
+	addr := net.JoinHostPort("", port)
+	lis, err := net.Listen("tcp", addr)
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+	var opts []grpc.ServerOption
+	grpcServer := grpc.NewServer(opts...)
+	proto.RegisterClientServiceServer(grpcServer, s)
+	go grpcServer.Serve(lis)
+	return grpcServer, nil
+}
+
+// NewServer creates new Server which implements ClientServiceServer interface.
+func NewServer(state *state.StateDB) *Server {
+	s := &Server{state}
+	return s
+}

client/wallet/main.go

@@ -1,24 +1,22 @@
 package main
 
 import (
+	"crypto/ecdsa"
 	"crypto/rand"
 	"encoding/hex"
 	"errors"
 	"flag"
 	"fmt"
+	"github.com/ethereum/go-ethereum/common"
+	crypto2 "github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/params"
+	client2 "github.com/harmony-one/harmony/client/service"
 	"log"
+	"math/big"
 	"strings"
 
 	"github.com/harmony-one/harmony/p2p/p2pimpl"
 
-	"io"
-	"io/ioutil"
-	math_rand "math/rand"
-	"os"
-	"strconv"
-	"time"
-
-	"github.com/dedis/kyber"
 	"github.com/harmony-one/harmony/blockchain"
 	"github.com/harmony-one/harmony/client"
 	client_config "github.com/harmony-one/harmony/client/config"
@@ -27,7 +25,11 @@ import (
 	"github.com/harmony-one/harmony/node"
 	"github.com/harmony-one/harmony/p2p"
 	proto_node "github.com/harmony-one/harmony/proto/node"
-	"github.com/harmony-one/harmony/utils"
+	"io"
+	"io/ioutil"
+	"os"
+	"strconv"
+	"time"
 )
 
 func main() {
@@ -72,7 +74,7 @@ func main() {
 			fmt.Printf("New account created:\nAddress: {%x}\n", address)
 		case "list":
 			for i, address := range ReadAddresses() {
-				fmt.Printf("Account %d:\n  {%x}\n", i+1, address)
+				fmt.Printf("Account %d:\n  {%s}\n", i+1, address.Hex())
 			}
 		case "clearAll":
 			ClearKeystore()
@@ -95,13 +97,11 @@ func main() {
 			fmt.Println("Private key imported...")
 		case "showBalance":
 			walletNode := CreateWalletServerNode()
-			go walletNode.StartServer()
 
-			shardUtxoMap, err := FetchUtxos(ReadAddresses(), walletNode)
+			for _, address := range ReadAddresses() {
-			if err != nil {
+				fmt.Printf("Account %s:\n  %d ether \n", address.Hex(), FetchBalance(address, walletNode).Uint64()/params.Ether)
-				fmt.Println(err)
+
 			}
-			PrintUtxoBalance(shardUtxoMap)
 		case "test":
 			// Testing code
 			priKey := pki.GetPrivateKeyScalarFromInt(444)
@@ -161,62 +161,9 @@ func main() {
 		copy(trimmedReceiverAddress[:], receiverAddress[:20])
 
 		senderPriKey := priKeys[senderIndex]
-		senderAddressBytes := pki.GetAddressFromPrivateKey(senderPriKey)
+		_ = senderPriKey
-
-		// Start client server
-		walletNode := CreateWalletServerNode()
-		go walletNode.StartServer()
-
-		shardUtxoMap, err := FetchUtxos([][20]byte{senderAddressBytes}, walletNode)
-		if err != nil {
-			fmt.Printf("Failed to fetch utxos: %s\n", err)
-		}
-
-		cummulativeBalance := 0
-		txInputs := []blockchain.TXInput{}
-	LOOP:
-		for shardID, utxoMap := range shardUtxoMap {
-			for txID, vout2AmountMap := range utxoMap[senderAddressBytes] {
-				txIDBytes, err := utils.Get32BytesFromString(txID)
-				if err != nil {
-					fmt.Println("Failed to parse txID")
-					continue
-				}
-				for voutIndex, utxoAmount := range vout2AmountMap {
-					cummulativeBalance += utxoAmount
-					txIn := blockchain.NewTXInput(blockchain.NewOutPoint(&txIDBytes, voutIndex), senderAddressBytes, shardID)
-					txInputs = append(txInputs, *txIn)
-					if cummulativeBalance >= amount {
-						break LOOP
-					}
-				}
-			}
-		}
-		txout := blockchain.TXOutput{Amount: amount, Address: trimmedReceiverAddress, ShardID: uint32(math_rand.Intn(len(shardUtxoMap)))}
-
-		txOutputs := []blockchain.TXOutput{txout}
-		if cummulativeBalance > amount {
-			changeTxOut := blockchain.TXOutput{Amount: cummulativeBalance - amount, Address: senderAddressBytes, ShardID: uint32(math_rand.Intn(len(shardUtxoMap)))}
-			txOutputs = append(txOutputs, changeTxOut)
-		}
 
-		tx := blockchain.Transaction{ID: [32]byte{}, PublicKey: pki.GetBytesFromPublicKey(pki.GetPublicKeyFromScalar(senderPriKey)), TxInput: txInputs, TxOutput: txOutputs, Proofs: nil}
+		// TODO: implement account transaction logic
-		tx.SetID() // TODO(RJ): figure out the correct way to set Tx ID.
-		tx.Sign(senderPriKey)
-
-		pubKey := crypto.Ed25519Curve.Point()
-		err = pubKey.UnmarshalBinary(tx.PublicKey[:])
-		if err != nil {
-			fmt.Println("Failed to deserialize public key", "error", err)
-		}
-
-		err = ExecuteTransaction(tx, walletNode)
-
-		if err != nil {
-			fmt.Println(err)
-		} else {
-			fmt.Println("Transaction submitted successfully")
-		}
 	default:
 		flag.PrintDefaults()
 		os.Exit(1)
@@ -252,7 +199,7 @@ func CreateWalletServerNode() *node.Node {
 	var shardIDLeaderMap map[uint32]p2p.Peer
 	var clientPeer *p2p.Peer
 	if true {
-		configr.ReadConfigFile("local_config2.txt")
+		configr.ReadConfigFile("local_config1.txt")
 		shardIDLeaderMap = configr.GetShardIDToLeaderMap()
 		clientPeer = configr.GetClientPeer()
 	} else {
@@ -295,6 +242,24 @@ func ExecuteTransaction(tx blockchain.Transaction, walletNode *node.Node) error
 	}
 }
 
+// FetchBalance fetches account balance of specified address from the Harmony network
+func FetchBalance(address common.Address, walletNode *node.Node) *big.Int {
+	fmt.Println("Fetching account balance...")
+	clients := []*client2.Client{}
+	for _, leader := range *walletNode.Client.Leaders {
+		clients = append(clients, client2.NewClient(leader.IP, "1841"))
+	}
+
+	balance := big.NewInt(0)
+	for _, client := range clients {
+		response := client.GetBalance(address)
+		theirBalance := big.NewInt(0)
+		theirBalance.SetBytes(response.Balance)
+		balance.Add(balance, theirBalance)
+	}
+	return balance
+}
+
 // FetchUtxos fetches utxos of specified address from the Harmony network
 func FetchUtxos(addresses [][20]byte, walletNode *node.Node) (map[uint32]blockchain.UtxoMap, error) {
 	fmt.Println("Fetching account balance...")
@@ -319,43 +284,24 @@ func FetchUtxos(addresses [][20]byte, walletNode *node.Node) (map[uint32]blockch
 	}
 }
 
-// PrintUtxoBalance prints utxo balance.
-func PrintUtxoBalance(shardUtxoMap map[uint32]blockchain.UtxoMap) {
-	addressBalance := make(map[[20]byte]int)
-	for _, utxoMap := range shardUtxoMap {
-		for address, txHash2Vout2AmountMap := range utxoMap {
-			for _, vout2AmountMap := range txHash2Vout2AmountMap {
-				for _, amount := range vout2AmountMap {
-					value, ok := addressBalance[address]
-					if ok {
-						addressBalance[address] = value + amount
-					} else {
-						addressBalance[address] = amount
-					}
-				}
-			}
-		}
-	}
-	for address, balance := range addressBalance {
-		fmt.Printf("Address: {%x}\n", address)
-		fmt.Printf("Balance: %d\n", balance)
-	}
-}
-
 // ReadAddresses reads the addresses stored in local keystore
-func ReadAddresses() [][20]byte {
+func ReadAddresses() []common.Address {
 	priKeys := ReadPrivateKeys()
-	addresses := [][20]byte{}
+	addresses := []common.Address{}
 	for _, key := range priKeys {
-		addresses = append(addresses, pki.GetAddressFromPrivateKey(key))
+		addresses = append(addresses, crypto2.PubkeyToAddress(key.PublicKey))
 	}
 	return addresses
 }
 
 // StorePrivateKey stores the specified private key in local keystore
 func StorePrivateKey(priKey []byte) {
+	privateKey, err := crypto2.ToECDSA(priKey)
+	if err != nil {
+		panic("Failed to deserialize private key")
+	}
 	for _, address := range ReadAddresses() {
-		if address == pki.GetAddressFromPrivateKey(crypto.Ed25519Curve.Scalar().SetBytes(priKey)) {
+		if address == crypto2.PubkeyToAddress(privateKey.PublicKey) {
 			fmt.Println("The key already exists in the keystore")
 			return
 		}
@@ -379,16 +325,19 @@ func ClearKeystore() {
 }
 
 // ReadPrivateKeys reads all the private key stored in local keystore
-func ReadPrivateKeys() []kyber.Scalar {
+func ReadPrivateKeys() []*ecdsa.PrivateKey {
 	keys, err := ioutil.ReadFile("keystore")
 	if err != nil {
-		return []kyber.Scalar{}
+		return []*ecdsa.PrivateKey{}
 	}
-	keyScalars := []kyber.Scalar{}
+	priKeys := []*ecdsa.PrivateKey{}
 	for i := 0; i < len(keys); i += 32 {
-		priKey := crypto.Ed25519Curve.Scalar()
+		priKey, err := crypto2.ToECDSA(keys[i : i+32])
-		priKey.UnmarshalBinary(keys[i : i+32])
+		if err != nil {
-		keyScalars = append(keyScalars, priKey)
+			fmt.Println("Failed deserializing key data: ", keys[i:i+32])
+			continue
+		}
+		priKeys = append(priKeys, priKey)
 	}
-	return keyScalars
+	return priKeys
 }

deploy.sh

@@ -62,7 +62,7 @@ while getopts "hpdtD:m:s:k:" option; do
       h) usage ;;
       p) PEER='-peer_discovery' ;;
       d) DB='-db_supported' ;;
-      t) TXGEN=false ;;
+      t) TXGEN=$OPTARG ;;
       D) DURATION=$OPTARG ;;
       m) MIN=$OPTARG ;;
       s) SHARDS=$OPTARG ;;
@@ -120,8 +120,9 @@ done < $config
 # Emulate node offline
 (sleep 45; killnode $KILLPORT) &
 
-echo "launching txgen ..."
+echo "launching txgen ..."Z
 if [ "$TXGEN" == "true" ]; then
+   echo "launching txgen ..."
    if [ -z "$PEER" ]; then
       ./bin/txgen -config_file $config -log_folder $log_folder -duration $DURATION
    else

node/node.go

@@ -5,6 +5,8 @@ import (
 	"crypto/ecdsa"
 	"encoding/gob"
 	"fmt"
+	"github.com/harmony-one/harmony/client"
+	clientService "github.com/harmony-one/harmony/client/service"
 	"math/big"
 	"math/rand"
 	"os"
@@ -18,7 +20,6 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/harmony-one/harmony/blockchain"
-	"github.com/harmony-one/harmony/client"
 	bft "github.com/harmony-one/harmony/consensus"
 	"github.com/harmony-one/harmony/core"
 	"github.com/harmony-one/harmony/core/types"
@@ -79,6 +80,7 @@ const (
 	syncingPortDifference = 3000
 	waitBeforeJoinShard   = time.Second * 3
 	timeOutToJoinShard    = time.Minute * 10
+	clientServicePort     = "1841"
 )
 
 // NetworkNode ...
@@ -119,6 +121,9 @@ type Node struct {
 	BlockChannelAccount        chan *types.Block // The channel to receive new blocks from Node
 	Worker                     *worker.Worker
 
+	// Client server (for wallet requests)
+	clientServer *clientService.Server
+
 	// Syncing component.
 	downloaderServer *downloader.Server
 	stateSync        *syncing.StateSync
@@ -272,6 +277,9 @@ func New(host host.Host, consensus *bft.Consensus, db *hdb.LDBDatabase) *Node {
 		node.SelfPeer = host.GetSelfPeer()
 	}
 
+	// Logger
+	node.log = log.New()
+
 	if host != nil && consensus != nil {
 		// Consensus and associated channel to communicate blocks
 		node.Consensus = consensus
@@ -305,6 +313,8 @@ func New(host host.Host, consensus *bft.Consensus, db *hdb.LDBDatabase) *Node {
 			testBankKey, _ := ecdsa.GenerateKey(crypto.S256(), reader)
 			testBankAddress := crypto.PubkeyToAddress(testBankKey.PublicKey)
 			testBankFunds := big.NewInt(8000000000000000000)
+			//fmt.Println(crypto.PubkeyToAddress(testBankKey.PublicKey).Hex())
+			//fmt.Println(hex.EncodeToString(crypto.FromECDSA(testBankKey)))
 			genesisAloc[testBankAddress] = core.GenesisAccount{Balance: testBankFunds}
 			node.TestBankKeys = append(node.TestBankKeys, testBankKey)
 		}
@@ -335,9 +345,7 @@ func New(host host.Host, consensus *bft.Consensus, db *hdb.LDBDatabase) *Node {
 		node.AddSmartContractsToPendingTransactions()
 	}
 
-	// Logger
+	if consensus != nil && consensus.IsLeader {
-	node.log = log.New()
-	if consensus.IsLeader {
 		node.State = NodeLeader
 	} else {
 		node.State = NodeInit
@@ -463,6 +471,27 @@ func (node *Node) JoinShard(leader p2p.Peer) {
 	}
 }
 
+// SupportClient initializes and starts the client service
+func (node *Node) SupportClient() {
+	node.InitClientServer()
+	node.StartClientServer()
+}
+
+// InitClientServer initializes client server.
+func (node *Node) InitClientServer() {
+	state, err := node.Chain.State()
+	if err != nil {
+		log.Error("Failed fetching state from blockchain")
+	}
+	node.clientServer = clientService.NewServer(state)
+}
+
+// StartClientServer starts client server.
+func (node *Node) StartClientServer() {
+	node.log.Info("support_client: StartClientServer on port:", "port", clientServicePort)
+	node.clientServer.Start(node.SelfPeer.IP, clientServicePort)
+}
+
 // SupportSyncing keeps sleeping until it's doing consensus or it's a leader.
 func (node *Node) SupportSyncing() {
 	node.InitSyncingServer()