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Merge pull request #1425 from filecoin-project/fix/randomness-for-ec

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use proper lookback, and proper serialization for randomness generation
This commit is contained in:
Whyrusleeping 2020-03-20 15:03:22 -07:00 committed by GitHub
commit aad449f28a
4 changed files with 31 additions and 8 deletions
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2
build/params_shared.go
View File

@ -64,7 +64,7 @@ const MaxSealLookback = SealRandomnessLookbackLimit + 2000
// Mining
// Epochs
const EcRandomnessLookback = 300
const EcRandomnessLookback = 1
// /////
// Devnet settings

14
chain/gen/gen.go
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@ -276,8 +276,12 @@ func CarWalkFunc(nd format.Node) (out []*format.Link, err error) {
func (cg *ChainGen) nextBlockProof(ctx context.Context, pts *types.TipSet, m address.Address, round int64) (*types.EPostProof, *types.Ticket, error) {
mc := &mca{w: cg.w, sm: cg.sm}
// TODO: REVIEW: Am I doing this correctly?
ticketRand, err := mc.ChainGetRandomness(ctx, pts.Key(), crypto.DomainSeparationTag_TicketProduction, pts.Height(), m.Bytes())
buf := new(bytes.Buffer)
if err := m.MarshalCBOR(buf); err != nil {
return nil, nil, xerrors.Errorf("failed to cbor marshal address: %w", err)
}
ticketRand, err := mc.ChainGetRandomness(ctx, pts.Key(), crypto.DomainSeparationTag_TicketProduction, abi.ChainEpoch(round-build.EcRandomnessLookback), buf.Bytes())
if err != nil {
return nil, nil, err
}
@ -549,7 +553,11 @@ type ProofInput struct {
}
func IsRoundWinner(ctx context.Context, ts *types.TipSet, round int64, miner address.Address, epp ElectionPoStProver, a MiningCheckAPI) (*ProofInput, error) {
epostRand, err := a.ChainGetRandomness(ctx, ts.Key(), crypto.DomainSeparationTag_ElectionPoStChallengeSeed, abi.ChainEpoch(round-build.EcRandomnessLookback), miner.Bytes())
buf := new(bytes.Buffer)
if err := miner.MarshalCBOR(buf); err != nil {
return nil, xerrors.Errorf("failed to cbor marshal address: %w")
}
epostRand, err := a.ChainGetRandomness(ctx, ts.Key(), crypto.DomainSeparationTag_ElectionPoStChallengeSeed, abi.ChainEpoch(round-build.EcRandomnessLookback), buf.Bytes())
if err != nil {
return nil, xerrors.Errorf("chain get randomness: %w", err)
}

13
chain/sync.go
View File

@ -1,6 +1,7 @@
package chain
import (
"bytes"
"context"
"errors"
"fmt"
@ -617,7 +618,11 @@ func (syncer *Syncer) ValidateBlock(ctx context.Context, b *types.FullBlock) err
})
tktsCheck := async.Err(func() error {
vrfBase, err := syncer.sm.ChainStore().GetRandomness(ctx, baseTs.Cids(), crypto.DomainSeparationTag_TicketProduction, int64(baseTs.Height()), h.Miner.Bytes())
buf := new(bytes.Buffer)
if err := h.Miner.MarshalCBOR(buf); err != nil {
return xerrors.Errorf("failed to marshal miner address to cbor: %w", err)
}
vrfBase, err := syncer.sm.ChainStore().GetRandomness(ctx, baseTs.Cids(), crypto.DomainSeparationTag_TicketProduction, int64(baseTs.Height()), buf.Bytes())
if err != nil {
return xerrors.Errorf("failed to get randomness for verifying election proof: %w", err)
}
@ -656,7 +661,11 @@ func (syncer *Syncer) ValidateBlock(ctx context.Context, b *types.FullBlock) err
}
func (syncer *Syncer) VerifyElectionPoStProof(ctx context.Context, h *types.BlockHeader, baseTs *types.TipSet, waddr address.Address) error {
rand, err := syncer.sm.ChainStore().GetRandomness(ctx, baseTs.Cids(), crypto.DomainSeparationTag_ElectionPoStChallengeSeed, int64(h.Height-build.EcRandomnessLookback), h.Miner.Bytes())
buf := new(bytes.Buffer)
if err := h.Miner.MarshalCBOR(buf); err != nil {
return xerrors.Errorf("failed to marshal miner to cbor: %w", err)
}
rand, err := syncer.sm.ChainStore().GetRandomness(ctx, baseTs.Cids(), crypto.DomainSeparationTag_ElectionPoStChallengeSeed, int64(h.Height-build.EcRandomnessLookback), buf.Bytes())
if err != nil {
return xerrors.Errorf("failed to get randomness for verifying election proof: %w", err)
}

10
miner/miner.go
View File

@ -1,12 +1,13 @@
package miner
import (
"bytes"
"context"
"fmt"
"sync"
"time"
"github.com/filecoin-project/go-address"
address "github.com/filecoin-project/go-address"
"github.com/filecoin-project/specs-actors/actors/abi"
"github.com/filecoin-project/specs-actors/actors/crypto"
lru "github.com/hashicorp/golang-lru"
@ -348,7 +349,12 @@ func (m *Miner) computeTicket(ctx context.Context, addr address.Address, base *M
return nil, err
}
input, err := m.api.ChainGetRandomness(ctx, base.ts.Key(), crypto.DomainSeparationTag_TicketProduction, base.ts.Height(), addr.Bytes())
buf := new(bytes.Buffer)
if err := addr.MarshalCBOR(buf); err != nil {
return nil, xerrors.Errorf("failed to marshal address to cbor: %w", err)
}
input, err := m.api.ChainGetRandomness(ctx, base.ts.Key(), crypto.DomainSeparationTag_TicketProduction, base.ts.Height(), buf.Bytes())
if err != nil {
return nil, err
}