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Merge pull request #1903 from filecoin-project/feat/reuse-get-tipset-by-height

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reuse GetTipsetByHeight in GetRandomness
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Whyrusleeping 2020-06-05 16:06:28 -07:00 committed by GitHub
commit 366359803a
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1 changed files with 24 additions and 19 deletions
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43
chain/store/store.go
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@ -916,30 +916,35 @@ func DrawRandomness(rbase []byte, pers crypto.DomainSeparationTag, round abi.Cha
return h.Sum(nil), nil
}
func (cs *ChainStore) GetRandomness(ctx context.Context, blks []cid.Cid, pers crypto.DomainSeparationTag, round abi.ChainEpoch, entropy []byte) (out []byte, err error) {
func (cs *ChainStore) GetRandomness(ctx context.Context, blks []cid.Cid, pers crypto.DomainSeparationTag, round abi.ChainEpoch, entropy []byte) ([]byte, error) {
_, span := trace.StartSpan(ctx, "store.GetRandomness")
defer span.End()
span.AddAttributes(trace.Int64Attribute("round", int64(round)))
//defer func() {
//log.Infof("getRand %v %d %d %x -> %x", blks, pers, round, entropy, out)
//}()
for {
nts, err := cs.LoadTipSet(types.NewTipSetKey(blks...))
if err != nil {
return nil, err
}
mtb := nts.MinTicketBlock()
// if at (or just past -- for null epochs) appropriate epoch
// or at genesis (works for negative epochs)
if nts.Height() <= round || mtb.Height == 0 {
return DrawRandomness(nts.MinTicketBlock().Ticket.VRFProof, pers, round, entropy)
}
blks = mtb.Parents
ts, err := cs.LoadTipSet(types.NewTipSetKey(blks...))
if err != nil {
return nil, err
}
if round > ts.Height() {
return nil, xerrors.Errorf("cannot draw randomness from the future")
}
searchHeight := round
if searchHeight < 0 {
searchHeight = 0
}
randTs, err := cs.GetTipsetByHeight(ctx, searchHeight, ts, true)
if err != nil {
return nil, err
}
mtb := randTs.MinTicketBlock()
// if at (or just past -- for null epochs) appropriate epoch
// or at genesis (works for negative epochs)
return DrawRandomness(mtb.Ticket.VRFProof, pers, round, entropy)
}
// GetTipsetByHeight returns the tipset on the chain behind 'ts' at the given