plugeth/eth/downloader/beacondevsync.go

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// Copyright 2023 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/>.
package downloader
import (
"errors"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
)
// BeaconDevSync is a development helper to test synchronization by providing
// a block hash instead of header to run the beacon sync against.
//
// The method will reach out to the network to retrieve the header of the sync
// target instead of receiving it from the consensus node.
//
// Note, this must not be used in live code. If the forkchcoice endpoint where
// to use this instead of giving us the payload first, then essentially nobody
// in the network would have the block yet that we'd attempt to retrieve.
func (d *Downloader) BeaconDevSync(mode SyncMode, hash common.Hash, stop chan struct{}) error {
// Be very loud that this code should not be used in a live node
log.Warn("----------------------------------")
log.Warn("Beacon syncing with hash as target", "hash", hash)
log.Warn("This is unhealthy for a live node!")
log.Warn("----------------------------------")
log.Info("Waiting for peers to retrieve sync target")
for {
// If the node is going down, unblock
select {
case <-stop:
return errors.New("stop requested")
default:
}
// Pick a random peer to sync from and keep retrying if none are yet
// available due to fresh startup
d.peers.lock.RLock()
var peer *peerConnection
for _, peer = range d.peers.peers {
break
}
d.peers.lock.RUnlock()
if peer == nil {
time.Sleep(time.Second)
continue
}
// Found a peer, attempt to retrieve the header whilst blocking and
// retry if it fails for whatever reason
log.Info("Attempting to retrieve sync target", "peer", peer.id)
headers, metas, err := d.fetchHeadersByHash(peer, hash, 1, 0, false)
if err != nil || len(headers) != 1 {
log.Warn("Failed to fetch sync target", "headers", len(headers), "err", err)
time.Sleep(time.Second)
continue
}
// Head header retrieved, if the hash matches, start the actual sync
if metas[0] != hash {
log.Error("Received invalid sync target", "want", hash, "have", metas[0])
time.Sleep(time.Second)
continue
}
return d.BeaconSync(mode, headers[0], headers[0])
}
}