forked from cerc-io/ipld-eth-server
134 lines
2.2 KiB
Go
134 lines
2.2 KiB
Go
package ping
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"errors"
|
|
"io"
|
|
"time"
|
|
|
|
u "github.com/ipfs/go-ipfs-util"
|
|
logging "github.com/ipfs/go-log"
|
|
host "github.com/libp2p/go-libp2p-host"
|
|
inet "github.com/libp2p/go-libp2p-net"
|
|
peer "github.com/libp2p/go-libp2p-peer"
|
|
)
|
|
|
|
var log = logging.Logger("ping")
|
|
|
|
const PingSize = 32
|
|
|
|
const ID = "/ipfs/ping/1.0.0"
|
|
|
|
const pingTimeout = time.Second * 60
|
|
|
|
type PingService struct {
|
|
Host host.Host
|
|
}
|
|
|
|
func NewPingService(h host.Host) *PingService {
|
|
ps := &PingService{h}
|
|
h.SetStreamHandler(ID, ps.PingHandler)
|
|
return ps
|
|
}
|
|
|
|
func (p *PingService) PingHandler(s inet.Stream) {
|
|
buf := make([]byte, PingSize)
|
|
|
|
errCh := make(chan error, 1)
|
|
defer close(errCh)
|
|
timer := time.NewTimer(pingTimeout)
|
|
defer timer.Stop()
|
|
|
|
go func() {
|
|
select {
|
|
case <-timer.C:
|
|
log.Debug("ping timeout")
|
|
case err, ok := <-errCh:
|
|
if ok {
|
|
log.Debug(err)
|
|
} else {
|
|
log.Error("ping loop failed without error")
|
|
}
|
|
}
|
|
s.Reset()
|
|
}()
|
|
|
|
for {
|
|
_, err := io.ReadFull(s, buf)
|
|
if err != nil {
|
|
errCh <- err
|
|
return
|
|
}
|
|
|
|
_, err = s.Write(buf)
|
|
if err != nil {
|
|
errCh <- err
|
|
return
|
|
}
|
|
|
|
timer.Reset(pingTimeout)
|
|
}
|
|
}
|
|
|
|
func (ps *PingService) Ping(ctx context.Context, p peer.ID) (<-chan time.Duration, error) {
|
|
return Ping(ctx, ps.Host, p)
|
|
}
|
|
|
|
func Ping(ctx context.Context, h host.Host, p peer.ID) (<-chan time.Duration, error) {
|
|
s, err := h.NewStream(ctx, p, ID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
out := make(chan time.Duration)
|
|
go func() {
|
|
defer close(out)
|
|
defer s.Reset()
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
return
|
|
default:
|
|
t, err := ping(s)
|
|
if err != nil {
|
|
log.Debugf("ping error: %s", err)
|
|
return
|
|
}
|
|
|
|
h.Peerstore().RecordLatency(p, t)
|
|
select {
|
|
case out <- t:
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}()
|
|
|
|
return out, nil
|
|
}
|
|
|
|
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.Since(before), nil
|
|
}
|