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disallow sourcing randomness from future epochs

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This commit is contained in:
Jeromy 2020-06-05 15:12:13 -07:00
parent cd817906b2
commit 73d928751d
1 changed files with 2 additions and 2 deletions
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4
chain/store/store.go
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@ -904,7 +904,7 @@ 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)))
@ -915,7 +915,7 @@ func (cs *ChainStore) GetRandomness(ctx context.Context, blks []cid.Cid, pers cr
}
if round > ts.Height() {
return DrawRandomness(ts.MinTicket().VRFProof, pers, round, entropy)
return nil, xerrors.Errorf("cannot draw randomness from the future")
}
searchHeight := round