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https://github.com/ethereum/go-ethereum.git
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76e3dc6b5b
This PR does a few things: - reject `debug_setHead` if the target is even before the pivot block (if non-nil) - reject `debug_setHead` if in path mode, the target is not recoverable - decouple the chain rewinding and state recovery in path mode and recover the state in one shot --------- Co-authored-by: jonny rhea <5555162+jrhea@users.noreply.github.com>
115 lines
4.3 KiB
Go
115 lines
4.3 KiB
Go
// Copyright 2025 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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"sync"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/eth/ethconfig"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/log"
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)
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// syncModer is responsible for managing the downloader's sync mode. It takes the
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// user's preference at startup and then determines the appropriate sync mode
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// based on the current chain status.
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type syncModer struct {
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mode ethconfig.SyncMode
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chain BlockChain
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disk ethdb.KeyValueReader
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lock sync.Mutex
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}
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func newSyncModer(mode ethconfig.SyncMode, chain BlockChain, disk ethdb.KeyValueReader) *syncModer {
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if mode == ethconfig.FullSync {
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// The database seems empty as the current block is the genesis. Yet the snap
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// block is ahead, so snap sync was enabled for this node at a certain point.
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// The scenarios where this can happen is
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// * if an internal reset (a fork config change or corruption recovery)
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// rolled a snap sync node back below the sync point.
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// * the last snap sync is not finished while user specifies a full sync this
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// time. But we don't have any recent state for full sync.
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// In these cases however it's safe to reenable snap sync.
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fullBlock, snapBlock := chain.CurrentBlock(), chain.CurrentSnapBlock()
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if fullBlock.Number.Uint64() == 0 && snapBlock.Number.Uint64() > 0 {
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mode = ethconfig.SnapSync
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log.Warn("Switching from full-sync to snap-sync", "reason", "snap-sync incomplete")
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} else if !chain.HasState(fullBlock.Root) {
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mode = ethconfig.SnapSync
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log.Warn("Switching from full-sync to snap-sync", "reason", "head state missing")
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} else {
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// Grant the full sync mode
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log.Info("Enabled full-sync", "head", fullBlock.Number, "hash", fullBlock.Hash())
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}
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} else {
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head := chain.CurrentBlock()
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if head.Number.Uint64() > 0 && chain.HasState(head.Root) {
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mode = ethconfig.FullSync
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log.Info("Switching from snap-sync to full-sync", "reason", "snap-sync complete")
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} else {
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// If snap sync was requested and our database is empty, grant it
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log.Info("Enabled snap-sync", "head", head.Number, "hash", head.Hash())
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}
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}
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return &syncModer{
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mode: mode,
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chain: chain,
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disk: disk,
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}
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}
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// get retrieves the current sync mode, either explicitly set, or derived
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// from the chain status.
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func (m *syncModer) get(report bool) ethconfig.SyncMode {
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m.lock.Lock()
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defer m.lock.Unlock()
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// If we're in snap sync mode, return that directly
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if m.mode == ethconfig.SnapSync {
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return ethconfig.SnapSync
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}
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logger := log.Debug
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if report {
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logger = log.Info
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}
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// We are probably in full sync, but an internal reset may have rewound the
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// chain below the snap sync pivot, check if we should re-enable snap sync.
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head := m.chain.CurrentBlock()
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if pivot := rawdb.ReadLastPivotNumber(m.disk); pivot != nil {
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if head.Number.Uint64() < *pivot {
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logger("Reenabled snap-sync as chain is lagging behind the pivot", "head", head.Number, "pivot", pivot)
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return ethconfig.SnapSync
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}
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}
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// We are in a full sync, but the associated head state is missing. To complete
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// the head state, forcefully rerun the snap sync. Note it doesn't mean the
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// persistent state is corrupted, just mismatch with the head block.
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if !m.chain.HasState(head.Root) {
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logger("Reenabled snap-sync as chain is stateless")
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return ethconfig.SnapSync
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}
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// Nope, we're really full syncing
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return ethconfig.FullSync
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}
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// disableSnap disables the snap sync mode, usually it's called after a successful snap sync.
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func (m *syncModer) disableSnap() {
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m.lock.Lock()
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m.mode = ethconfig.FullSync
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m.lock.Unlock()
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}
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