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