lotus/chain/types/blockheader.go

215 lines
4.0 KiB
Go

package types
import (
"bytes"
"math/big"
"github.com/filecoin-project/specs-actors/actors/abi"
"github.com/filecoin-project/specs-actors/actors/crypto"
block "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
"github.com/minio/sha256-simd"
"github.com/multiformats/go-multihash"
xerrors "golang.org/x/xerrors"
"github.com/filecoin-project/go-address"
"github.com/filecoin-project/lotus/build"
)
type Ticket struct {
VRFProof []byte
}
type ElectionProof struct {
VRFProof []byte
}
type BeaconEntry struct {
Round uint64
Data []byte
}
func NewBeaconEntry(round uint64, data []byte) BeaconEntry {
return BeaconEntry{
Round: round,
Data: data,
}
}
type BlockHeader struct {
Miner address.Address // 0
Ticket *Ticket // 1
ElectionProof *ElectionProof
BeaconEntries []BeaconEntry
WinPoStProof []abi.PoStProof
Parents []cid.Cid // 3
ParentWeight BigInt // 4
Height abi.ChainEpoch // 5
ParentStateRoot cid.Cid // 6
ParentMessageReceipts cid.Cid // 7
Messages cid.Cid // 8
BLSAggregate *crypto.Signature // 9
Timestamp uint64 // 10
BlockSig *crypto.Signature // 11
ForkSignaling uint64 // 12
}
func (b *BlockHeader) ToStorageBlock() (block.Block, error) {
data, err := b.Serialize()
if err != nil {
return nil, err
}
pref := cid.NewPrefixV1(cid.DagCBOR, multihash.BLAKE2B_MIN+31)
c, err := pref.Sum(data)
if err != nil {
return nil, err
}
return block.NewBlockWithCid(data, c)
}
func (b *BlockHeader) Cid() cid.Cid {
sb, err := b.ToStorageBlock()
if err != nil {
panic(err) // Not sure i'm entirely comfortable with this one, needs to be checked
}
return sb.Cid()
}
func DecodeBlock(b []byte) (*BlockHeader, error) {
var blk BlockHeader
if err := blk.UnmarshalCBOR(bytes.NewReader(b)); err != nil {
return nil, err
}
return &blk, nil
}
func (blk *BlockHeader) Serialize() ([]byte, error) {
buf := new(bytes.Buffer)
if err := blk.MarshalCBOR(buf); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (blk *BlockHeader) LastTicket() *Ticket {
return blk.Ticket
}
func (blk *BlockHeader) SigningBytes() ([]byte, error) {
blkcopy := *blk
blkcopy.BlockSig = nil
return blkcopy.Serialize()
}
type MsgMeta struct {
BlsMessages cid.Cid
SecpkMessages cid.Cid
}
func (mm *MsgMeta) Cid() cid.Cid {
b, err := mm.ToStorageBlock()
if err != nil {
panic(err) // also maybe sketchy
}
return b.Cid()
}
func (mm *MsgMeta) ToStorageBlock() (block.Block, error) {
buf := new(bytes.Buffer)
if err := mm.MarshalCBOR(buf); err != nil {
return nil, xerrors.Errorf("failed to marshal MsgMeta: %w", err)
}
pref := cid.NewPrefixV1(cid.DagCBOR, multihash.BLAKE2B_MIN+31)
c, err := pref.Sum(buf.Bytes())
if err != nil {
return nil, err
}
return block.NewBlockWithCid(buf.Bytes(), c)
}
func CidArrsEqual(a, b []cid.Cid) bool {
if len(a) != len(b) {
return false
}
// order ignoring compare...
s := make(map[cid.Cid]bool)
for _, c := range a {
s[c] = true
}
for _, c := range b {
if !s[c] {
return false
}
}
return true
}
func CidArrsContains(a []cid.Cid, b cid.Cid) bool {
for _, elem := range a {
if elem.Equals(b) {
return true
}
}
return false
}
var blocksPerEpoch = NewInt(build.BlocksPerEpoch)
const sha256bits = 256
func IsTicketWinner(vrfTicket []byte, mypow BigInt, totpow BigInt) bool {
/*
Need to check that
(h(vrfout) + 1) / (max(h) + 1) <= e * myPower / totalPower
max(h) == 2^256-1
which in terms of integer math means:
(h(vrfout) + 1) * totalPower <= e * myPower * 2^256
in 2^256 space, it is equivalent to:
h(vrfout) * totalPower < e * myPower * 2^256
*/
h := sha256.Sum256(vrfTicket)
lhs := BigFromBytes(h[:]).Int
lhs = lhs.Mul(lhs, totpow.Int)
// rhs = sectorSize * 2^256
// rhs = sectorSize << 256
rhs := new(big.Int).Lsh(mypow.Int, sha256bits)
rhs = rhs.Mul(rhs, blocksPerEpoch.Int)
// h(vrfout) * totalPower < e * sectorSize * 2^256?
return lhs.Cmp(rhs) < 0
}
func (t *Ticket) Equals(ot *Ticket) bool {
return bytes.Equal(t.VRFProof, ot.VRFProof)
}