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// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// +build !nopssprotocol,!nopssping
package pss
import (
"context"
"errors"
"time"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/protocols"
"github.com/ethereum/go-ethereum/swarm/log"
)
// Generic ping protocol implementation for
// pss devp2p protocol emulation
type PingMsg struct {
Created time.Time
Pong bool // set if message is pong reply
}
type Ping struct {
Pong bool // toggle pong reply upon ping receive
OutC chan bool // trigger ping
InC chan bool // optional, report back to calling code
}
func (p *Ping) pingHandler(ctx context.Context, msg interface{}) error {
var pingmsg *PingMsg
var ok bool
if pingmsg, ok = msg.(*PingMsg); !ok {
return errors.New("invalid msg")
}
log.Debug("ping handler", "msg", pingmsg, "outc", p.OutC)
if p.InC != nil {
p.InC <- pingmsg.Pong
}
if p.Pong && !pingmsg.Pong {
p.OutC <- true
}
return nil
}
var PingProtocol = &protocols.Spec{
Name: "psstest",
Version: 1,
MaxMsgSize: 1024,
Messages: []interface{}{
PingMsg{},
},
}
var PingTopic = ProtocolTopic(PingProtocol)
func NewPingProtocol(ping *Ping) *p2p.Protocol {
return &p2p.Protocol{
Name: PingProtocol.Name,
Version: PingProtocol.Version,
Length: uint64(PingProtocol.MaxMsgSize),
Run: func(p *p2p.Peer, rw p2p.MsgReadWriter) error {
quitC := make(chan struct{})
pp := protocols.NewPeer(p, rw, PingProtocol)
log.Trace("running pss vprotocol", "peer", p, "outc", ping.OutC)
go func() {
for {
select {
case ispong := <-ping.OutC:
pp.Send(context.TODO(), &PingMsg{
Created: time.Now(),
Pong: ispong,
})
case <-quitC:
}
}
}()
err := pp.Run(ping.pingHandler)
quitC <- struct{}{}
return err
},
}
}
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