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core: mirror full node reorg logic in light client too (#20931)

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* core: fix the condition of reorg

* core: fix nitpick to only retrieve head once

* core: don't reorg if received chain is longer at same diff

Co-authored-by: Péter Szilágyi <peterke@gmail.com>
This commit is contained in:
icodezjb 2020-04-22 16:27:47 +08:00 committed by GitHub
parent b9df7ecdc3
commit 2ec7232191
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 11 additions and 2 deletions
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13
core/headerchain.go
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@ -149,7 +149,8 @@ func (hc *HeaderChain) WriteHeader(header *types.Header) (status WriteStatus, er
if ptd == nil {
return NonStatTy, consensus.ErrUnknownAncestor
}
localTd := hc.GetTd(hc.currentHeaderHash, hc.CurrentHeader().Number.Uint64())
head := hc.CurrentHeader().Number.Uint64()
localTd := hc.GetTd(hc.currentHeaderHash, head)
externTd := new(big.Int).Add(header.Difficulty, ptd)
// Irrelevant of the canonical status, write the td and header to the database
@ -165,7 +166,15 @@ func (hc *HeaderChain) WriteHeader(header *types.Header) (status WriteStatus, er
// If the total difficulty is higher than our known, add it to the canonical chain
// Second clause in the if statement reduces the vulnerability to selfish mining.
// Please refer to http://www.cs.cornell.edu/~ie53/publications/btcProcFC.pdf
if externTd.Cmp(localTd) > 0 || (externTd.Cmp(localTd) == 0 && mrand.Float64() < 0.5) {
reorg := externTd.Cmp(localTd) > 0
if !reorg && externTd.Cmp(localTd) == 0 {
if header.Number.Uint64() < head {
reorg = true
} else if header.Number.Uint64() == head {
reorg = mrand.Float64() < 0.5
}
}
if reorg {
// If the header can be added into canonical chain, adjust the
// header chain markers(canonical indexes and head header flag).
//