Remove borsh borsh new borsch

mtproto/rpc/handshake_request.go

@@ -0,0 +1,21 @@
+package rpc
+
+import "bytes"
+
+type HandshakeRequest struct {
+}
+
+func (r *HandshakeRequest) Bytes() []byte {
+	buf := &bytes.Buffer{}
+
+	buf.Write(TagHandshake)
+	buf.Write(HandshakeFlags)
+	buf.Write(HandshakeSenderPID)
+	buf.Write(HandshakePeerPID)
+
+	return buf.Bytes()
+}
+
+func NewHandshakeRequest() *HandshakeRequest {
+	return &HandshakeRequest{}
+}

mtproto/rpc/rpc_handshake_response.go → mtproto/rpc/handshake_response.go

@@ -6,14 +6,14 @@ import (
 	"github.com/juju/errors"
 )
 
-type RPCHandshakeResponse struct {
+type HandshakeResponse struct {
 	Type      []byte
 	Flags     []byte
 	SenderPID []byte
 	PeerPID   []byte
 }
 
-func (r *RPCHandshakeResponse) Bytes() []byte {
+func (r *HandshakeResponse) Bytes() []byte {
 	buf := &bytes.Buffer{}
 
 	buf.Write(r.Type[:])
@@ -24,23 +24,23 @@ func (r *RPCHandshakeResponse) Bytes() []byte {
 	return buf.Bytes()
 }
 
-func (r *RPCHandshakeResponse) Valid(req *RPCHandshakeRequest) error {
-	if !bytes.Equal(r.Type, RPCTagHandshake) {
+func (r *HandshakeResponse) Valid(req *HandshakeRequest) error {
+	if !bytes.Equal(r.Type, TagHandshake) {
 		return errors.New("Unexpected handshake tag")
 	}
-	if !bytes.Equal(r.PeerPID, RPCHandshakeSenderPID) {
+	if !bytes.Equal(r.PeerPID, HandshakeSenderPID) {
 		return errors.New("Incorrect sender PID")
 	}
 
 	return nil
 }
 
-func NewRPCHandshakeResponse(data []byte) (*RPCHandshakeResponse, error) {
+func NewHandshakeResponse(data []byte) (*HandshakeResponse, error) {
 	if len(data) != 32 {
 		return nil, errors.New("Incorrect handshake response length")
 	}
 
-	return &RPCHandshakeResponse{
+	return &HandshakeResponse{
 		Type:      data[:4],
 		Flags:     data[4:8],
 		SenderPID: data[8:20],

mtproto/rpc/rpc_nonce_request.go → mtproto/rpc/nonce_request.go

@@ -9,25 +9,25 @@ import (
 	"github.com/juju/errors"
 )
 
-type RPCNonceRequest struct {
+type NonceRequest struct {
 	KeySelector []byte
 	CryptoTS    []byte
 	Nonce       []byte
 }
 
-func (r *RPCNonceRequest) Bytes() []byte {
+func (r *NonceRequest) Bytes() []byte {
 	buf := &bytes.Buffer{}
 
-	buf.Write(RPCTagNonce)
+	buf.Write(TagNonce)
 	buf.Write(r.KeySelector)
-	buf.Write(RPCNonceCryptoAES)
+	buf.Write(NonceCryptoAES)
 	buf.Write(r.CryptoTS)
 	buf.Write(r.Nonce)
 
 	return buf.Bytes()
 }
 
-func NewRPCNonceRequest(proxySecret []byte) (*RPCNonceRequest, error) {
+func NewNonceRequest(proxySecret []byte) (*NonceRequest, error) {
 	nonce := make([]byte, 16)
 	keySelector := make([]byte, 4)
 	cryptoTS := make([]byte, 4)
@@ -40,7 +40,7 @@ func NewRPCNonceRequest(proxySecret []byte) (*RPCNonceRequest, error) {
 	timestamp := time.Now().Truncate(time.Second).Unix() % 4294967296 // 256 ^ 4 - do not know how to name
 	binary.LittleEndian.PutUint32(cryptoTS, uint32(timestamp))
 
-	return &RPCNonceRequest{
+	return &NonceRequest{
 		KeySelector: keySelector,
 		CryptoTS:    cryptoTS,
 		Nonce:       nonce,

mtproto/rpc/rpc_nonce_response.go → mtproto/rpc/nonce_response.go

@@ -6,17 +6,17 @@ import (
 	"github.com/juju/errors"
 )
 
-type RPCNonceResponse struct {
-	RPCNonceRequest
+type NonceResponse struct {
+	NonceRequest
 
-	RPCType []byte
-	Crypto  []byte
+	Type   []byte
+	Crypto []byte
 }
 
-func (r *RPCNonceResponse) Bytes() []byte {
+func (r *NonceResponse) Bytes() []byte {
 	buf := &bytes.Buffer{}
 
-	buf.Write(r.RPCType)
+	buf.Write(r.Type)
 	buf.Write(r.KeySelector)
 	buf.Write(r.Crypto)
 	buf.Write(r.CryptoTS)
@@ -25,11 +25,11 @@ func (r *RPCNonceResponse) Bytes() []byte {
 	return buf.Bytes()
 }
 
-func (r *RPCNonceResponse) Valid(req *RPCNonceRequest) error {
-	if !bytes.Equal(r.RPCType, RPCTagNonce) {
+func (r *NonceResponse) Valid(req *NonceRequest) error {
+	if !bytes.Equal(r.Type, TagNonce) {
 		return errors.New("Unexpected RPC type")
 	}
-	if !bytes.Equal(r.Crypto, RPCNonceCryptoAES) {
+	if !bytes.Equal(r.Crypto, NonceCryptoAES) {
 		return errors.New("Unexpected crypto type")
 	}
 	if !bytes.Equal(r.KeySelector, req.KeySelector) {
@@ -39,18 +39,18 @@ func (r *RPCNonceResponse) Valid(req *RPCNonceRequest) error {
 	return nil
 }
 
-func NewRPCNonceResponse(data []byte) (*RPCNonceResponse, error) {
+func NewNonceResponse(data []byte) (*NonceResponse, error) {
 	if len(data) != 32 {
 		return nil, errors.New("Unexpected message length")
 	}
 
-	return &RPCNonceResponse{
-		RPCNonceRequest: RPCNonceRequest{
+	return &NonceResponse{
+		NonceRequest: NonceRequest{
 			KeySelector: data[4:8],
 			CryptoTS:    data[12:16],
 			Nonce:       data[16:],
 		},
-		RPCType: data[:4],
-		Crypto:  data[8:12],
+		Type:   data[:4],
+		Crypto: data[8:12],
 	}, nil
 }

mtproto/rpc/proxy_flags.go

@@ -0,0 +1,24 @@
+package rpc
+
+import "encoding/binary"
+
+type proxyRequestFlags uint32
+
+const (
+	proxyRequestFlagsHasAdTag     proxyRequestFlags = 0x8
+	proxyRequestFlagsEncrypted                      = 0x2
+	proxyRequestFlagsMagic                          = 0x1000
+	proxyRequestFlagsExtMode2                       = 0x20000
+	proxyRequestFlagsIntermediate                   = 0x20000000
+	proxyRequestFlagsAbdridged                      = 0x40000000
+	proxyRequestFlagsQuickAck                       = 0x80000000
+)
+
+var proxyRequestFlagsEncryptedPrefix [8]byte
+
+func (r proxyRequestFlags) Bytes() []byte {
+	converted := make([]byte, 4)
+	binary.LittleEndian.PutUint32(converted, uint32(r))
+
+	return converted
+}

mtproto/rpc/rpc_proxy_request.go → mtproto/rpc/proxy_request.go

@@ -11,8 +11,8 @@ import (
 	"github.com/9seconds/mtg/mtproto"
 )
 
-type RPCProxyRequest struct {
-	Flags        RPCProxyRequestFlags
+type ProxyRequest struct {
+	Flags        proxyRequestFlags
 	ConnectionID []byte
 	OurIPPort    []byte
 	ClientIPPort []byte
@@ -20,25 +20,25 @@ type RPCProxyRequest struct {
 	Options      *mtproto.ConnectionOpts
 }
 
-func (r *RPCProxyRequest) Bytes(message []byte) []byte {
+func (r *ProxyRequest) Bytes(message []byte) []byte {
 	buf := &bytes.Buffer{}
 
 	flags := r.Flags
 	if r.Options.QuickAck {
-		flags |= RPCProxyRequestFlagsQuickAck
+		flags |= proxyRequestFlagsQuickAck
 	}
 
-	if bytes.HasPrefix(message, rpcProxyRequestFlagsEncryptedPrefix[:]) {
-		flags |= RPCProxyRequestFlagsEncrypted
+	if bytes.HasPrefix(message, proxyRequestFlagsEncryptedPrefix[:]) {
+		flags |= proxyRequestFlagsEncrypted
 	}
 
-	buf.Write(RPCTagProxyRequest)
+	buf.Write(TagProxyRequest)
 	buf.Write(flags.Bytes())
 	buf.Write(r.ConnectionID[:])
 	buf.Write(r.ClientIPPort[:])
 	buf.Write(r.OurIPPort[:])
-	buf.Write(RPCProxyRequestExtraSize)
-	buf.Write(RPCProxyRequestProxyTag)
+	buf.Write(ProxyRequestExtraSize)
+	buf.Write(ProxyRequestProxyTag)
 	buf.WriteByte(byte(len(r.ADTag)))
 	buf.Write(r.ADTag)
 	buf.Write(bytes.Repeat([]byte{0x00}, buf.Len()%4))
@@ -47,17 +47,17 @@ func (r *RPCProxyRequest) Bytes(message []byte) []byte {
 	return buf.Bytes()
 }
 
-func NewRPCProxyRequest(clientAddr, ownAddr *net.TCPAddr, opts *mtproto.ConnectionOpts, adTag []byte) (*RPCProxyRequest, error) {
-	flags := RPCProxyRequestFlagsHasAdTag | RPCProxyRequestFlagsMagic | RPCProxyRequestFlagsExtMode2
+func NewProxyRequest(clientAddr, ownAddr *net.TCPAddr, opts *mtproto.ConnectionOpts, adTag []byte) (*ProxyRequest, error) {
+	flags := proxyRequestFlagsHasAdTag | proxyRequestFlagsMagic | proxyRequestFlagsExtMode2
 
 	switch opts.ConnectionType {
 	case mtproto.ConnectionTypeAbridged:
-		flags |= RPCProxyRequestFlagsAbdridged
+		flags |= proxyRequestFlagsAbdridged
 	case mtproto.ConnectionTypeIntermediate:
-		flags |= RPCProxyRequestFlagsIntermediate
+		flags |= proxyRequestFlagsIntermediate
 	}
 
-	request := RPCProxyRequest{
+	request := &ProxyRequest{
 		Flags:        flags,
 		ADTag:        adTag,
 		Options:      opts,
@@ -79,5 +79,5 @@ func NewRPCProxyRequest(clientAddr, ownAddr *net.TCPAddr, opts *mtproto.Connecti
 	binary.LittleEndian.PutUint32(port[:], uint32(ownAddr.Port))
 	copy(request.OurIPPort[16:], port[:])
 
-	return &request, nil
+	return request, nil
 }

mtproto/rpc/rpc.go

@@ -1,30 +1,30 @@
 package rpc
 
 const (
-	RPCNonceSeqNo     = -2
-	RPCHandshakeSeqNo = -1
+	SeqNoNonce     = -2
+	SeqNoHandshake = -1
 )
 
 var (
-	RPCTagCloseExt     = []byte{0xa2, 0x34, 0xb6, 0x5e}
-	RPCTagProxyAns     = []byte{0x0d, 0xda, 0x03, 0x44}
-	RPCTagSimpleAck    = []byte{0x9b, 0x40, 0xac, 0x3b}
-	RPCTagHandshake    = []byte{0xf5, 0xee, 0x82, 0x76}
-	RPCTagNonce        = []byte{0xaa, 0x87, 0xcb, 0x7a}
-	RPCTagProxyRequest = []byte{0xee, 0xf1, 0xce, 0x36}
+	TagCloseExt     = []byte{0xa2, 0x34, 0xb6, 0x5e}
+	TagProxyAns     = []byte{0x0d, 0xda, 0x03, 0x44}
+	TagSimpleAck    = []byte{0x9b, 0x40, 0xac, 0x3b}
+	TagHandshake    = []byte{0xf5, 0xee, 0x82, 0x76}
+	TagNonce        = []byte{0xaa, 0x87, 0xcb, 0x7a}
+	TagProxyRequest = []byte{0xee, 0xf1, 0xce, 0x36}
 
-	RPCNonceCryptoAES = []byte{0x01, 0x00, 0x00, 0x00}
+	NonceCryptoAES = []byte{0x01, 0x00, 0x00, 0x00}
 
-	RPCHandshakeFlags = []byte{0x00, 0x00, 0x00, 0x00}
+	HandshakeFlags = []byte{0x00, 0x00, 0x00, 0x00}
 
-	RPCProxyRequestExtraSize = []byte{0x18, 0x00, 0x00, 0x00}
-	RPCProxyRequestProxyTag  = []byte{0xae, 0x26, 0x1e, 0xdb}
+	ProxyRequestExtraSize = []byte{0x18, 0x00, 0x00, 0x00}
+	ProxyRequestProxyTag  = []byte{0xae, 0x26, 0x1e, 0xdb}
 
-	RPCHandshakeSenderPID = []byte{}
-	RPCHandshakePeerPID   = []byte{}
+	HandshakeSenderPID []byte
+	HandshakePeerPID   []byte
 )
 
 func init() {
-	RPCHandshakeSenderPID = []byte("IPIPPRPDTIME")
-	RPCHandshakePeerPID = []byte("IPIPPRPDTIME")
+	HandshakeSenderPID = []byte("IPIPPRPDTIME")
+	HandshakePeerPID = []byte("IPIPPRPDTIME")
 }

mtproto/rpc/rpc_handshake_request.go

@@ -1,21 +0,0 @@
-package rpc
-
-import "bytes"
-
-type RPCHandshakeRequest struct {
-}
-
-func (r *RPCHandshakeRequest) Bytes() []byte {
-	buf := &bytes.Buffer{}
-
-	buf.Write(RPCTagHandshake)
-	buf.Write(RPCHandshakeFlags)
-	buf.Write(RPCHandshakeSenderPID)
-	buf.Write(RPCHandshakePeerPID)
-
-	return buf.Bytes()
-}
-
-func NewRPCHandshakeRequest() *RPCHandshakeRequest {
-	return &RPCHandshakeRequest{}
-}

mtproto/rpc/rpc_proxy_flags.go

@@ -1,24 +0,0 @@
-package rpc
-
-import "encoding/binary"
-
-type RPCProxyRequestFlags uint32
-
-const (
-	RPCProxyRequestFlagsHasAdTag     RPCProxyRequestFlags = 0x8
-	RPCProxyRequestFlagsEncrypted                         = 0x2
-	RPCProxyRequestFlagsMagic                             = 0x1000
-	RPCProxyRequestFlagsExtMode2                          = 0x20000
-	RPCProxyRequestFlagsIntermediate                      = 0x20000000
-	RPCProxyRequestFlagsAbdridged                         = 0x40000000
-	RPCProxyRequestFlagsQuickAck                          = 0x80000000
-)
-
-var rpcProxyRequestFlagsEncryptedPrefix [8]byte
-
-func (r RPCProxyRequestFlags) Bytes() []byte {
-	converted := make([]byte, 4)
-	binary.LittleEndian.PutUint32(converted, uint32(r))
-
-	return converted
-}

mtproto/wrappers/crypt.go

@@ -22,7 +22,7 @@ const (
 
 var emptyIP = [4]byte{0x00, 0x00, 0x00, 0x00}
 
-func NewMiddleProxyCipherRWC(conn wrappers.ReadWriteCloserWithAddr, req *rpc.RPCNonceRequest, resp *rpc.RPCNonceResponse, secret []byte) wrappers.ReadWriteCloserWithAddr {
+func NewMiddleProxyCipherRWC(conn wrappers.ReadWriteCloserWithAddr, req *rpc.NonceRequest, resp *rpc.NonceResponse, secret []byte) wrappers.ReadWriteCloserWithAddr {
 	localAddr := conn.LocalAddr()
 	remoteAddr := conn.RemoteAddr()
 
@@ -35,8 +35,7 @@ func NewMiddleProxyCipherRWC(conn wrappers.ReadWriteCloserWithAddr, req *rpc.RPC
 	return wrappers.NewBlockCipherRWC(conn, enc, dec)
 }
 
-func makeKeys(purpose CipherPurpose, req *rpc.RPCNonceRequest, resp *rpc.RPCNonceResponse,
-	client *net.TCPAddr, remote *net.TCPAddr, secret []byte) ([]byte, []byte) {
+func makeKeys(purpose CipherPurpose, req *rpc.NonceRequest, resp *rpc.NonceResponse, client *net.TCPAddr, remote *net.TCPAddr, secret []byte) ([]byte, []byte) {
 	message := bytes.Buffer{}
 	message.Write(resp.Nonce[:])
 	message.Write(req.Nonce[:])

mtproto/wrappers/crypt_test.go

@@ -21,13 +21,13 @@ var proxySecret = []byte{196, 249, 250, 202, 150, 120, 230, 187, 72, 173,
 	183, 6, 27, 38, 93, 178, 18}
 
 func TestMakeKeys(t *testing.T) {
-	req, err := rpc.NewRPCNonceRequest(proxySecret)
+	req, err := rpc.NewNonceRequest(proxySecret)
 	assert.Nil(t, err)
 
 	copy(req.Nonce[:], []byte{24, 49, 53, 111, 198, 10, 235, 180, 230, 112, 92, 78, 1, 201, 106, 105})
 	binary.LittleEndian.PutUint32(req.CryptoTS[:], 1528396015)
 
-	resp := &rpc.RPCNonceResponse{}
+	resp := &rpc.NonceResponse{}
 	copy(resp.Nonce[:], []byte{247, 40, 210, 56, 65, 12, 101, 170, 216, 155, 14, 253, 250, 238, 219, 226})
 
 	cltAddr := &net.TCPAddr{

mtproto/wrappers/proxy_request.go

@@ -17,7 +17,7 @@ type ProxyRequestReadWriteCloserWithAddr struct {
 	wrappers.BufferedReader
 
 	conn wrappers.ReadWriteCloserWithAddr
-	req  *rpc.RPCProxyRequest
+	req  *rpc.ProxyRequest
 }
 
 func (p *ProxyRequestReadWriteCloserWithAddr) Read(buf []byte) (int, error) {
@@ -29,11 +29,11 @@ func (p *ProxyRequestReadWriteCloserWithAddr) Read(buf []byte) (int, error) {
 			return errors.Annotate(err, "Cannot read RPC tag")
 		}
 
-		if bytes.Equal(ansBuf.Bytes(), rpc.RPCTagCloseExt) {
+		if bytes.Equal(ansBuf.Bytes(), rpc.TagCloseExt) {
 			return p.readCloseExt()
-		} else if bytes.Equal(ansBuf.Bytes(), rpc.RPCTagProxyAns) {
+		} else if bytes.Equal(ansBuf.Bytes(), rpc.TagProxyAns) {
 			return p.readProxyAns(buf)
-		} else if bytes.Equal(ansBuf.Bytes(), rpc.RPCTagSimpleAck) {
+		} else if bytes.Equal(ansBuf.Bytes(), rpc.TagSimpleAck) {
 			return p.readSimpleAck()
 		}
 
@@ -99,7 +99,7 @@ func (p *ProxyRequestReadWriteCloserWithAddr) RemoteAddr() *net.TCPAddr {
 }
 
 func NewProxyRequestRWC(conn wrappers.ReadWriteCloserWithAddr, connOpts *mtproto.ConnectionOpts, adTag []byte) (wrappers.ReadWriteCloserWithAddr, error) {
-	req, err := rpc.NewRPCProxyRequest(connOpts.ClientAddr, conn.LocalAddr(), connOpts, adTag)
+	req, err := rpc.NewProxyRequest(connOpts.ClientAddr, conn.LocalAddr(), connOpts, adTag)
 	if err != nil {
 		return nil, errors.Annotate(err, "Cannot create new RPC proxy request")
 	}

telegram/middle.go

@@ -50,7 +50,7 @@ func NewMiddleTelegram(conf *config.Config, logger *zap.SugaredLogger) Telegram
 }
 
 func (t *middleTelegram) Init(connOpts *mtproto.ConnectionOpts, conn wrappers.ReadWriteCloserWithAddr) (wrappers.ReadWriteCloserWithAddr, error) {
-	rpcNonceConn := mtwrappers.NewFrameRWC(conn, rpc.RPCNonceSeqNo)
+	rpcNonceConn := mtwrappers.NewFrameRWC(conn, rpc.SeqNoNonce)
 
 	rpcNonceReq, err := t.sendRPCNonceRequest(rpcNonceConn)
 	if err != nil {
@@ -62,7 +62,7 @@ func (t *middleTelegram) Init(connOpts *mtproto.ConnectionOpts, conn wrappers.Re
 	}
 
 	secureConn := mtwrappers.NewMiddleProxyCipherRWC(conn, rpcNonceReq, rpcNonceResp, t.proxySecret)
-	secureConn = mtwrappers.NewFrameRWC(secureConn, rpc.RPCHandshakeSeqNo)
+	secureConn = mtwrappers.NewFrameRWC(secureConn, rpc.SeqNoHandshake)
 
 	rpcHandshakeReq, err := t.sendRPCHandshakeRequest(secureConn)
 	if err != nil {
@@ -76,8 +76,8 @@ func (t *middleTelegram) Init(connOpts *mtproto.ConnectionOpts, conn wrappers.Re
 	return mtwrappers.NewProxyRequestRWC(secureConn, connOpts, t.conf.AdTag)
 }
 
-func (t *middleTelegram) sendRPCNonceRequest(conn io.Writer) (*rpc.RPCNonceRequest, error) {
-	rpcNonceReq, err := rpc.NewRPCNonceRequest(t.proxySecret)
+func (t *middleTelegram) sendRPCNonceRequest(conn io.Writer) (*rpc.NonceRequest, error) {
+	rpcNonceReq, err := rpc.NewNonceRequest(t.proxySecret)
 	if err != nil {
 		return nil, errors.Annotate(err, "Cannot create RPC nonce request")
 	}
@@ -88,14 +88,15 @@ func (t *middleTelegram) sendRPCNonceRequest(conn io.Writer) (*rpc.RPCNonceReque
 	return rpcNonceReq, nil
 }
 
-func (t *middleTelegram) receiveRPCNonceResponse(conn io.Reader, req *rpc.RPCNonceRequest) (*rpc.RPCNonceResponse, error) {
+func (t *middleTelegram) receiveRPCNonceResponse(conn io.Reader, req *rpc.NonceRequest) (*rpc.NonceResponse, error) {
 	var ans [128]byte
 
 	n, err := conn.Read(ans[:])
 	if err != nil {
 		return nil, errors.Annotate(err, "Cannot read RPC nonce response")
 	}
-	rpcNonceResp, err := rpc.NewRPCNonceResponse(ans[:n])
+
+	rpcNonceResp, err := rpc.NewNonceResponse(ans[:n])
 	if err != nil {
 		return nil, errors.Annotate(err, "Cannot initialize RPC nonce response")
 	}
@@ -106,8 +107,8 @@ func (t *middleTelegram) receiveRPCNonceResponse(conn io.Reader, req *rpc.RPCNon
 	return rpcNonceResp, nil
 }
 
-func (t *middleTelegram) sendRPCHandshakeRequest(conn io.Writer) (*rpc.RPCHandshakeRequest, error) {
-	req := rpc.NewRPCHandshakeRequest()
+func (t *middleTelegram) sendRPCHandshakeRequest(conn io.Writer) (*rpc.HandshakeRequest, error) {
+	req := rpc.NewHandshakeRequest()
 	if _, err := conn.Write(req.Bytes()); err != nil {
 		return nil, errors.Annotate(err, "Cannot send RPC handshake request")
 	}
@@ -115,14 +116,15 @@ func (t *middleTelegram) sendRPCHandshakeRequest(conn io.Writer) (*rpc.RPCHandsh
 	return req, nil
 }
 
-func (t *middleTelegram) receiveRPCHandshakeResponse(conn io.Reader, req *rpc.RPCHandshakeRequest) (*rpc.RPCHandshakeResponse, error) {
+func (t *middleTelegram) receiveRPCHandshakeResponse(conn io.Reader, req *rpc.HandshakeRequest) (*rpc.HandshakeResponse, error) {
 	var ans [128]byte
 
 	n, err := conn.Read(ans[:])
 	if err != nil {
 		return nil, errors.Annotate(err, "Cannot read RPC handshake response")
 	}
-	rpcHandshakeResp, err := rpc.NewRPCHandshakeResponse(ans[:n])
+
+	rpcHandshakeResp, err := rpc.NewHandshakeResponse(ans[:n])
 	if err != nil {
 		return nil, errors.Annotate(err, "Cannot initialize RPC handshake response")
 	}