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frame.go
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frame.go
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package relay
import (
"crypto/ecdsa"
"encoding/binary"
"fmt"
"io"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/gogo/protobuf/proto"
"github.com/sonm-io/core/proto"
)
// SignedETHAddr represents self-signed ETH address.
type SignedETHAddr struct {
addr common.Address
sign []byte
}
// NewSignedAddr constructs a new self-signed Ethereum address using the specified
// private key.
func NewSignedAddr(key *ecdsa.PrivateKey) (SignedETHAddr, error) {
addr := crypto.PubkeyToAddress(key.PublicKey)
hash := chainhash.DoubleHashB(addr.Bytes())
sign, err := crypto.Sign(hash, key)
if err != nil {
return SignedETHAddr{}, err
}
m := SignedETHAddr{
addr: addr,
sign: sign,
}
return m, nil
}
func (m *SignedETHAddr) Addr() common.Address {
return m.addr
}
func newDiscover(addr common.Address) *sonm.HandshakeRequest {
return &sonm.HandshakeRequest{
PeerType: sonm.PeerType_DISCOVER,
Addr: addr.Bytes(),
}
}
func newDiscoverResponse(addr string) *sonm.DiscoverResponse {
return &sonm.DiscoverResponse{
Addr: addr,
}
}
func newServerHandshake(addr SignedETHAddr) *sonm.HandshakeRequest {
return &sonm.HandshakeRequest{
PeerType: sonm.PeerType_SERVER,
Addr: addr.addr.Bytes(),
Sign: addr.sign,
}
}
func newClientHandshake(addr common.Address, uuid string) *sonm.HandshakeRequest {
return &sonm.HandshakeRequest{
PeerType: sonm.PeerType_CLIENT,
Addr: addr.Bytes(),
UUID: uuid,
}
}
func sendFrame(wr io.Writer, message proto.Message) error {
frame, err := proto.Marshal(message)
if err != nil {
return err
}
if err := binary.Write(wr, binary.BigEndian, uint16(len(frame))); err != nil {
return err
}
var bytesSent int
for bytesSent < len(frame) {
n, err := wr.Write(frame[bytesSent:])
if err != nil {
return err
}
bytesSent += n
}
return nil
}
func recvFrame(rd io.Reader, message proto.Message) error {
var size uint16
if err := binary.Read(rd, binary.BigEndian, &size); err != nil {
return err
}
if size > 4096 {
return fmt.Errorf("message too large")
}
var buf [4096]byte
var bytesRead int
for bytesRead < int(size) {
n, err := rd.Read(buf[bytesRead:size])
if err != nil {
return err
}
bytesRead += n
}
if err := proto.Unmarshal(buf[:bytesRead], message); err != nil {
return err
}
return nil
}