chainSyncer.modeAndLocalHead

	Source (upstream pre-purge)	Current
File	eth/sync.go	sync_pow.go
Symbol	chainSyncer.modeAndLocalHead	chainSyncer.modeAndLocalHead
Ref	f4d53133f~1	etc/v1.17.3-full-node

3-way merge — purge → getc ← upstream

pre-purgefork-only

↗func (cs *chainSyncer) modeAndLocalHead() (downloader.SyncMode, *big.Int) {

// If we're in snap sync mode, return that directly

if cs.handler.downloader.ConfigSyncMode() == ethconfig.SnapSync {

↗ block := cs.handler.chain.CurrentSnapBlock()

td := cs.handler.chain.GetTd(block.Hash(), block.Number.Uint64())

return downloader.SnapSync, td

}

// We are probably in full sync, but we might have rewound to before the

// snap sync pivot, check if we should re-enable snap sync.

head := cs.handler.chain.CurrentBlock()

if pivot := rawdb.ReadLastPivotNumber(cs.handler.database); pivot != nil {

if head.Number.Uint64() < *pivot {

block := cs.handler.chain.CurrentSnapBlock()

td := cs.handler.chain.GetTd(block.Hash(), block.Number.Uint64())

return downloader.SnapSync, td

}

}

// We are in a full sync, but the associated head state is missing. To complete

// the head state, forcefully rerun the snap sync. Note it doesn't mean the

// persistent state is corrupted, just mismatch with the head block.

if !cs.handler.chain.HasState(head.Root) {

block := cs.handler.chain.CurrentSnapBlock()

td := cs.handler.chain.GetTd(block.Hash(), block.Number.Uint64())

log.Info("Reenabled snap sync as chain is stateless")

return downloader.SnapSync, td

}

// Nope, we're really full syncing

td := cs.handler.chain.GetTd(head.Hash(), head.Number.Uint64())

return downloader.FullSync, td

}

core-geth validation — +1 -1

| | | |---|---| | File | [`sync.go`](https://github.com/etclabscore/core-geth/blob/v1.12.20/eth/sync.go) | | Symbol | `chainSyncer.modeAndLocalHead` | | Ref | `v1.12.20` |

--- a/core-geth/eth/sync.go
+++ b/etc/eth/sync_pow.go
@@ -1,6 +1,6 @@
 func (cs *chainSyncer) modeAndLocalHead() (downloader.SyncMode, *big.Int) {
    // If we're in snap sync mode, return that directly
-   if cs.handler.snapSync.Load() {
+   if cs.handler.downloader.ConfigSyncMode() == ethconfig.SnapSync {
        block := cs.handler.chain.CurrentSnapBlock()
        td := cs.handler.chain.GetTd(block.Hash(), block.Number.Uint64())
        return downloader.SnapSync, td

← Sync & Downloader