func EchoStreamHandler(stream inet.Stream) {
go func() {
defer stream.Close()
// pull out the ipfs conn
c := stream.Conn()
log.Infof("%s ponging to %s", c.LocalPeer(), c.RemotePeer())
buf := make([]byte, 4)
for {
if _, err := stream.Read(buf); err != nil {
if err != io.EOF {
log.Info("ping receive error:", err)
}
return
}
if !bytes.Equal(buf, []byte("ping")) {
log.Infof("ping receive error: ping != %s %v", buf, buf)
return
}
if _, err := stream.Write([]byte("pong")); err != nil {
log.Info("pond send error:", err)
return
}
}
}()
}
func (p *PingService) PingHandler(s inet.Stream) {
buf := make([]byte, PingSize)
for {
_, err := io.ReadFull(s, buf)
if err != nil {
log.Debug(err)
return
}
_, err = s.Write(buf)
if err != nil {
log.Debug(err)
return
}
}
}
func ping(s inet.Stream) (time.Duration, error) {
buf := make([]byte, PingSize)
u.NewTimeSeededRand().Read(buf)
before := time.Now()
_, err := s.Write(buf)
if err != nil {
return 0, err
}
rbuf := make([]byte, PingSize)
_, err = io.ReadFull(s, rbuf)
if err != nil {
return 0, err
}
if !bytes.Equal(buf, rbuf) {
return 0, errors.New("ping packet was incorrect!")
}
return time.Now().Sub(before), nil
}