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reuse GetTipsetByHeight in GetRandomness

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This commit is contained in:
Jeromy 2020-06-02 17:35:23 -07:00
parent 8aa158d4e6
commit 2fdcf5347b
1 changed files with 19 additions and 18 deletions
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37
chain/store/store.go
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@ -909,25 +909,26 @@ func (cs *ChainStore) GetRandomness(ctx context.Context, blks []cid.Cid, pers cr
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
}
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