lotus/chain/types/blockheader.go

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package types
import (
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"bytes"
"crypto/sha256"
"math/big"
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block "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
"github.com/multiformats/go-multihash"
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xerrors "golang.org/x/xerrors"
"github.com/filecoin-project/go-lotus/chain/address"
)
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type Ticket struct {
VRFProof []byte
VDFResult []byte
VDFProof []byte
}
type ElectionProof []byte
type BlockHeader struct {
Miner address.Address
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Tickets []*Ticket
ElectionProof []byte
Parents []cid.Cid
ParentWeight BigInt
Height uint64
StateRoot cid.Cid
Messages cid.Cid
BLSAggregate Signature
MessageReceipts cid.Cid
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Timestamp uint64
BlockSig Signature
}
func (b *BlockHeader) ToStorageBlock() (block.Block, error) {
data, err := b.Serialize()
if err != nil {
return nil, err
}
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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)
}
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.Tickets[len(blk.Tickets)-1]
}
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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 {
panic(err)
}
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 PowerCmp(eproof ElectionProof, mpow, totpow BigInt) bool {
/*
Need to check that
h(vrfout) / 2^256 < minerPower / totalPower
*/
h := sha256.Sum256(eproof)
// 2^256
rden := BigInt{big.NewInt(0).Exp(big.NewInt(2), big.NewInt(256), nil)}
top := BigMul(rden, mpow)
out := BigDiv(top, totpow)
return BigCmp(BigFromBytes(h[:]), out) < 0
}