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core: define and test chain rewind corner cases (#21409)

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* core: define and test chain reparation cornercases

* core: write up a variety of set-head tests

* core, eth: unify chain rollbacks, handle all the cases

* core: make linter smile

* core: remove commented out legacy code

* core, eth/downloader: fix review comments

* core: revert a removed recovery mechanism
This commit is contained in:
Péter Szilágyi
2020-08-20 13:01:24 +03:00
committed by GitHub
parent 0bdd295cc0
commit 8cbdc8638f
13 changed files with 3953 additions and 215 deletions
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18
eth/sync.go
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@ -271,15 +271,25 @@ func peerToSyncOp(mode downloader.SyncMode, p *peer) *chainSyncOp {
}
func (cs *chainSyncer) modeAndLocalHead() (downloader.SyncMode, *big.Int) {
// If we're in fast sync mode, return that directly
if atomic.LoadUint32(&cs.pm.fastSync) == 1 {
block := cs.pm.blockchain.CurrentFastBlock()
td := cs.pm.blockchain.GetTdByHash(block.Hash())
return downloader.FastSync, td
} else {
head := cs.pm.blockchain.CurrentHeader()
td := cs.pm.blockchain.GetTd(head.Hash(), head.Number.Uint64())
return downloader.FullSync, td
}
// We are probably in full sync, but we might have rewound to before the
// fast sync pivot, check if we should reenable
if pivot := rawdb.ReadLastPivotNumber(cs.pm.chaindb); pivot != nil {
if head := cs.pm.blockchain.CurrentBlock(); head.NumberU64() < *pivot {
block := cs.pm.blockchain.CurrentFastBlock()
td := cs.pm.blockchain.GetTdByHash(block.Hash())
return downloader.FastSync, td
}
}
// Nope, we're really full syncing
head := cs.pm.blockchain.CurrentHeader()
td := cs.pm.blockchain.GetTd(head.Hash(), head.Number.Uint64())
return downloader.FullSync, td
}
// startSync launches doSync in a new goroutine.