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ping.go
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ping.go
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package discovery
import (
"bytes"
"errors"
"github.com/spacemeshos/go-spacemesh/common/types"
"github.com/spacemeshos/go-spacemesh/log"
"net"
"time"
"github.com/spacemeshos/go-spacemesh/p2p/node"
"github.com/spacemeshos/go-spacemesh/p2p/p2pcrypto"
"github.com/spacemeshos/go-spacemesh/p2p/server"
)
func (p *protocol) newPingRequestHandler() func(msg server.Message) []byte {
return func(msg server.Message) []byte {
plogger := p.logger.WithFields(log.String("type", "ping"), log.String("from", msg.Sender().String()))
plogger.Debug("handle request")
pinged := &node.Info{}
err := types.BytesToInterface(msg.Bytes(), pinged)
if err != nil {
plogger.Error("failed to deserialize ping message err=", err)
return nil
}
if err := p.verifyPinger(msg.Metadata().FromAddress, pinged); err != nil {
plogger.Error("msg contents were not valid err=", err)
return nil
}
//pong
payload, err := types.InterfaceToBytes(p.local)
// TODO: include the resolved To address
if err != nil {
plogger.Error("Error marshaling response message (Ping)")
return nil
}
plogger.Debug("Sending pong message")
return payload
}
}
func (p *protocol) verifyPinger(from net.Addr, pi *node.Info) error {
// todo : Validate ToAddr or drop it.
// todo: check the address provided with an extra ping before updating. ( if we haven't checked it for a while )
// todo: decide on best way to know our ext address
if err := pi.Valid(); err != nil {
return err
}
//TODO: only accept local (unspecified/loopback) IPs from other local ips.
ipfrom, _, _ := net.SplitHostPort(from.String())
pi.IP = net.ParseIP(ipfrom)
// inbound ping is the actual source of this node info
p.table.AddAddress(pi, pi)
return nil
}
// Ping notifies `peer` about our p2p identity.
func (p *protocol) Ping(peer p2pcrypto.PublicKey) error {
plogger := p.logger.WithFields(log.String("type", "ping"), log.String("to", peer.String()))
plogger.Debug("send request")
data, err := types.InterfaceToBytes(p.local)
if err != nil {
return err
}
ch := make(chan []byte)
foo := func(msg []byte) {
defer close(ch)
plogger.Debug("handle response")
sender := &node.Info{}
err := types.BytesToInterface(msg, sender)
if err != nil {
plogger.Warning("got unreadable pong. err=%v", err)
return
}
// todo: if we pinged it we already have id so no need to update
// todo : but what if id or listen address has changed ?
ch <- sender.ID.Bytes()
}
err = p.msgServer.SendRequest(PingPong, data, peer, foo)
if err != nil {
return err
}
timeout := time.NewTimer(MessageTimeout) // todo: check whether this is useless because of `requestLifetime`
select {
case id := <-ch:
if id == nil {
return errors.New("failed sending message")
}
if !bytes.Equal(id, peer.Bytes()) {
return errors.New("got pong with different public key")
}
case <-timeout.C:
return errors.New("ping timeouted")
}
return nil
}