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