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Use older randomness for the PoSt commit on specs-actors version 2

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After the upgrade, we're allowed to use randomness up to the challenge epoch.
This safe-guards us against very large reorgs where a miner computes a PoSt very
quickly.
This commit is contained in:
Steven Allen 2020-10-23 12:32:07 -07:00
parent 8124fe98c7
commit 109b326ae2
2 changed files with 11 additions and 1 deletions
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9
storage/wdpost_run.go
View File

@ -12,6 +12,7 @@ import (
"github.com/filecoin-project/go-state-types/big"
"github.com/filecoin-project/go-state-types/crypto"
"github.com/filecoin-project/go-state-types/dline"
"github.com/filecoin-project/go-state-types/network"
"github.com/ipfs/go-cid"
"go.opencensus.io/trace"
@ -151,7 +152,15 @@ func (s *WindowPoStScheduler) runSubmitPoST(
defer span.End()
// Get randomness from tickets
// use the challenge epoch if we've upgraded to network version 4
// (actors version 2). We want to go back as far as possible to be safe.
commEpoch := deadline.Open
if ver, err := s.api.StateNetworkVersion(ctx, types.EmptyTSK); err != nil {
log.Errorw("failed to get network version to determine PoSt epoch randomness lookback", "error", err)
} else if ver >= network.Version4 {
commEpoch = deadline.Challenge
}
commRand, err := s.api.ChainGetRandomnessFromTickets(ctx, ts.Key(), crypto.DomainSeparationTag_PoStChainCommit, commEpoch, nil)
if err != nil {
err = xerrors.Errorf("failed to get chain randomness from tickets for windowPost (ts=%d; deadline=%d): %w", ts.Height(), commEpoch, err)

3
storage/wdpost_run_test.go
View File

@ -23,6 +23,7 @@ import (
tutils "github.com/filecoin-project/specs-actors/v2/support/testing"
"github.com/filecoin-project/lotus/api"
"github.com/filecoin-project/lotus/build"
"github.com/filecoin-project/lotus/chain/actors/builtin/miner"
"github.com/filecoin-project/lotus/chain/types"
"github.com/filecoin-project/lotus/journal"
@ -47,7 +48,7 @@ func (m *mockStorageMinerAPI) StateMinerInfo(ctx context.Context, a address.Addr
}
func (m *mockStorageMinerAPI) StateNetworkVersion(ctx context.Context, key types.TipSetKey) (network.Version, error) {
panic("implement me")
return build.NewestNetworkVersion, nil
}
func (m *mockStorageMinerAPI) ChainGetRandomnessFromTickets(ctx context.Context, tsk types.TipSetKey, personalization crypto.DomainSeparationTag, randEpoch abi.ChainEpoch, entropy []byte) (abi.Randomness, error) {