go-waku/waku/v2/node/keepalive.go

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package node
import (
"context"
"fmt"
"time"
"github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/libp2p/go-libp2p/p2p/protocol/ping"
)
const maxAllowedPingFailures = 2
const maxPublishAttempt = 5
// startKeepAlive creates a go routine that periodically pings connected peers.
// This is necessary because TCP connections are automatically closed due to inactivity,
// and doing a ping will avoid this (with a small bandwidth cost)
func (w *WakuNode) startKeepAlive(t time.Duration) {
go func() {
defer w.wg.Done()
w.log.Info("Setting up ping protocol with duration of ", t)
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ticker := time.NewTicker(t)
defer ticker.Stop()
for {
select {
case <-ticker.C:
// Compared to Network's peers collection,
// Peerstore contains all peers ever connected to,
// thus if a host goes down and back again,
// pinging a peer will trigger identification process,
// which is not possible when iterating
// through Network's peer collection, as it will be empty
for _, p := range w.host.Peerstore().Peers() {
if p != w.host.ID() {
w.wg.Add(1)
go w.pingPeer(p)
}
}
case <-w.quit:
return
}
}
}()
}
func (w *WakuNode) pingPeer(peer peer.ID) {
w.keepAliveMutex.Lock()
defer w.keepAliveMutex.Unlock()
defer w.wg.Done()
ctx, cancel := context.WithTimeout(w.ctx, 3*time.Second)
defer cancel()
w.log.Debug("Pinging ", peer)
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pr := ping.Ping(ctx, w.host, peer)
select {
case res := <-pr:
if res.Error != nil {
w.keepAliveFails[peer]++
w.log.Debug(fmt.Sprintf("Could not ping %s: %s", peer, res.Error.Error()))
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} else {
w.keepAliveFails[peer] = 0
}
case <-ctx.Done():
w.keepAliveFails[peer]++
w.log.Debug(fmt.Sprintf("Could not ping %s: %s", peer, ctx.Err()))
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}
if w.keepAliveFails[peer] > maxAllowedPingFailures && w.host.Network().Connectedness(peer) == network.Connected {
w.log.Info("Disconnecting peer ", peer)
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if err := w.host.Network().ClosePeer(peer); err != nil {
w.log.Debug(fmt.Sprintf("Could not close conn to peer %s: %s", peer, err))
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}
w.keepAliveFails[peer] = 0
}
}