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client.go
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client.go
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package relay
import (
"fmt"
"net"
"github.com/ethereum/go-ethereum/common"
"github.com/gogo/protobuf/proto"
"github.com/sonm-io/core/proto"
)
// Dial communicates with the relay server waiting for other server peer to
// establish a relayed TCP connection.
//
// All network traffic will be transported through that server.
func Dial(addr net.Addr, targetAddr common.Address, uuid string) (net.Conn, error) {
client, err := newClient(addr)
if err != nil {
return nil, err
}
defer client.Close()
member, err := client.discover(targetAddr)
if err != nil {
return nil, err
}
return member.dial(targetAddr, uuid)
}
// Listen publishes itself to the relay server waiting for other client peer
// to establish a relayed TCP connection.
//
// All network traffic will be transported through that server.
func Listen(addr net.Addr, publishAddr SignedETHAddr) (net.Conn, error) {
client, err := newClient(addr)
if err != nil {
return nil, err
}
defer client.Close()
member, err := client.discover(publishAddr.addr)
if err != nil {
return nil, err
}
return member.accept(publishAddr)
}
type client struct {
conn net.Conn
}
func newClient(addr net.Addr) (*client, error) {
conn, err := net.Dial("tcp", addr.String())
if err != nil {
return nil, err
}
m := &client{
conn: conn,
}
return m, nil
}
func (m *client) discover(peer common.Address) (*client, error) {
if err := sendFrame(m.conn, newDiscover(peer)); err != nil {
return nil, err
}
response := &sonm.DiscoverResponse{}
if err := recvFrame(m.conn, response); err != nil {
return nil, err
}
addr, err := net.ResolveTCPAddr("tcp", response.Addr)
if err != nil {
return nil, err
}
return newClient(addr)
}
func (m *client) dial(targetAddr common.Address, uuid string) (net.Conn, error) {
if err := m.handshake(newClientHandshake(targetAddr, uuid)); err != nil {
m.conn.Close()
return nil, err
}
return m.conn, nil
}
func (m *client) accept(publishAddr SignedETHAddr) (net.Conn, error) {
if err := m.handshake(newServerHandshake(publishAddr)); err != nil {
m.conn.Close()
return nil, err
}
return m.conn, nil
}
func (m *client) handshake(message proto.Message) error {
if err := sendFrame(m.conn, message); err != nil {
return err
}
response := &sonm.HandshakeResponse{}
if err := recvFrame(m.conn, response); err != nil {
return err
}
if response.Error != 0 {
return fmt.Errorf("failed to perform handshake into relay: %s", response.Description)
}
return nil
}
func (m *client) Close() error {
return m.conn.Close()
}