forked from cerc-io/plugeth
core: mirror full node reorg logic in light client too (#20931)
* 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>
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@ -149,7 +149,8 @@ func (hc *HeaderChain) WriteHeader(header *types.Header) (status WriteStatus, er
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if ptd == nil {
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return NonStatTy, consensus.ErrUnknownAncestor
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}
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localTd := hc.GetTd(hc.currentHeaderHash, hc.CurrentHeader().Number.Uint64())
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head := hc.CurrentHeader().Number.Uint64()
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localTd := hc.GetTd(hc.currentHeaderHash, head)
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externTd := new(big.Int).Add(header.Difficulty, ptd)
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// Irrelevant of the canonical status, write the td and header to the database
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@ -165,7 +166,15 @@ func (hc *HeaderChain) WriteHeader(header *types.Header) (status WriteStatus, er
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// If the total difficulty is higher than our known, add it to the canonical chain
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// Second clause in the if statement reduces the vulnerability to selfish mining.
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// Please refer to http://www.cs.cornell.edu/~ie53/publications/btcProcFC.pdf
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if externTd.Cmp(localTd) > 0 || (externTd.Cmp(localTd) == 0 && mrand.Float64() < 0.5) {
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reorg := externTd.Cmp(localTd) > 0
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if !reorg && externTd.Cmp(localTd) == 0 {
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if header.Number.Uint64() < head {
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reorg = true
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} else if header.Number.Uint64() == head {
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reorg = mrand.Float64() < 0.5
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}
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}
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if reorg {
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// If the header can be added into canonical chain, adjust the
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// header chain markers(canonical indexes and head header flag).
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//
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