lotus/chain/types/blockheader.go

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package types
import (
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"bytes"
"math/big"
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"github.com/ipfs/go-cid"
block "github.com/ipfs/go-libipfs/blocks"
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"github.com/minio/blake2b-simd"
"golang.org/x/xerrors"
"github.com/filecoin-project/go-address"
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"github.com/filecoin-project/go-state-types/abi"
"github.com/filecoin-project/go-state-types/crypto"
"github.com/filecoin-project/go-state-types/proof"
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"github.com/filecoin-project/lotus/build"
)
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type Ticket struct {
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VRFProof []byte
}
func (t *Ticket) Quality() float64 {
ticketHash := blake2b.Sum256(t.VRFProof)
ticketNum := BigFromBytes(ticketHash[:]).Int
ticketDenu := big.NewInt(1)
ticketDenu.Lsh(ticketDenu, 256)
tv, _ := new(big.Rat).SetFrac(ticketNum, ticketDenu).Float64()
tq := 1 - tv
return tq
}
type BeaconEntry struct {
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Round uint64
Data []byte
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}
func NewBeaconEntry(round uint64, data []byte) BeaconEntry {
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return BeaconEntry{
Round: round,
Data: data,
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}
}
type BlockHeader struct {
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Miner address.Address // 0 unique per block/miner
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Ticket *Ticket // 1 unique per block/miner: should be a valid VRF
ElectionProof *ElectionProof // 2 unique per block/miner: should be a valid VRF
BeaconEntries []BeaconEntry // 3 identical for all blocks in same tipset
WinPoStProof []proof.PoStProof // 4 unique per block/miner
Parents []cid.Cid // 5 identical for all blocks in same tipset
ParentWeight BigInt // 6 identical for all blocks in same tipset
Height abi.ChainEpoch // 7 identical for all blocks in same tipset
ParentStateRoot cid.Cid // 8 identical for all blocks in same tipset
ParentMessageReceipts cid.Cid // 9 identical for all blocks in same tipset
Messages cid.Cid // 10 unique per block
BLSAggregate *crypto.Signature // 11 unique per block: aggrregate of BLS messages from above
Timestamp uint64 // 12 identical for all blocks in same tipset / hard-tied to the value of Height above
BlockSig *crypto.Signature // 13 unique per block/miner: miner signature
ForkSignaling uint64 // 14 currently unused/undefined
ParentBaseFee abi.TokenAmount // 15 identical for all blocks in same tipset: the base fee after executing parent tipset
validated bool // internal, true if the signature has been validated
}
func (blk *BlockHeader) ToStorageBlock() (block.Block, error) {
data, err := blk.Serialize()
if err != nil {
return nil, err
}
c, err := abi.CidBuilder.Sum(data)
if err != nil {
return nil, err
}
return block.NewBlockWithCid(data, c)
}
func (blk *BlockHeader) Cid() cid.Cid {
sb, err := blk.ToStorageBlock()
if err != nil {
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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
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if err := blk.UnmarshalCBOR(bytes.NewReader(b)); err != nil {
return nil, err
}
return &blk, nil
}
func (blk *BlockHeader) Serialize() ([]byte, error) {
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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
}
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func (blk *BlockHeader) SigningBytes() ([]byte, error) {
blkcopy := *blk
blkcopy.BlockSig = nil
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return blkcopy.Serialize()
}
func (blk *BlockHeader) SetValidated() {
blk.validated = true
}
func (blk *BlockHeader) IsValidated() bool {
return blk.validated
}
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type MsgMeta struct {
BlsMessages cid.Cid
SecpkMessages cid.Cid
}
func (mm *MsgMeta) Cid() cid.Cid {
b, err := mm.ToStorageBlock()
if err != nil {
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panic(err) // also maybe sketchy
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}
return b.Cid()
}
func (mm *MsgMeta) ToStorageBlock() (block.Block, error) {
var buf bytes.Buffer
if err := mm.MarshalCBOR(&buf); err != nil {
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return nil, xerrors.Errorf("failed to marshal MsgMeta: %w", err)
}
c, err := abi.CidBuilder.Sum(buf.Bytes())
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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 CidArrsSubset(a, b []cid.Cid) bool {
// order ignoring compare...
s := make(map[cid.Cid]bool)
for _, c := range b {
s[c] = true
}
for _, c := range a {
if !s[c] {
return false
}
}
return true
}
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func CidArrsContains(a []cid.Cid, b cid.Cid) bool {
for _, elem := range a {
if elem.Equals(b) {
return true
}
}
return false
}
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var blocksPerEpoch = NewInt(build.BlocksPerEpoch)
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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
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in 2^256 space, it is equivalent to:
h(vrfout) * totalPower < e * myPower * 2^256
*/
h := blake2b.Sum256(vrfTicket)
lhs := BigFromBytes(h[:]).Int
lhs = lhs.Mul(lhs, totpow.Int)
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// rhs = sectorSize * 2^256
// rhs = sectorSize << 256
rhs := new(big.Int).Lsh(mypow.Int, sha256bits)
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rhs = rhs.Mul(rhs, blocksPerEpoch.Int)
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// h(vrfout) * totalPower < e * sectorSize * 2^256?
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return lhs.Cmp(rhs) < 0
}
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func (t *Ticket) Equals(ot *Ticket) bool {
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return bytes.Equal(t.VRFProof, ot.VRFProof)
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}