102 lines
2.7 KiB
Go
102 lines
2.7 KiB
Go
package sealing
|
|
|
|
import (
|
|
"io"
|
|
"math/bits"
|
|
"math/rand"
|
|
"sync"
|
|
|
|
"github.com/filecoin-project/specs-actors/actors/abi"
|
|
"github.com/hashicorp/go-multierror"
|
|
|
|
sectorbuilder "github.com/filecoin-project/go-sectorbuilder"
|
|
)
|
|
|
|
func fillersFromRem(in abi.UnpaddedPieceSize) ([]abi.UnpaddedPieceSize, error) {
|
|
// Convert to in-sector bytes for easier math:
|
|
//
|
|
// Sector size to user bytes ratio is constant, e.g. for 1024B we have 1016B
|
|
// of user-usable data.
|
|
//
|
|
// (1024/1016 = 128/127)
|
|
//
|
|
// Given that we can get sector size by simply adding 1/127 of the user
|
|
// bytes
|
|
//
|
|
// (we convert to sector bytes as they are nice round binary numbers)
|
|
|
|
toFill := uint64(in + (in / 127))
|
|
|
|
// We need to fill the sector with pieces that are powers of 2. Conveniently
|
|
// computers store numbers in binary, which means we can look at 1s to get
|
|
// all the piece sizes we need to fill the sector. It also means that number
|
|
// of pieces is the number of 1s in the number of remaining bytes to fill
|
|
out := make([]abi.UnpaddedPieceSize, bits.OnesCount64(toFill))
|
|
for i := range out {
|
|
// Extract the next lowest non-zero bit
|
|
next := bits.TrailingZeros64(toFill)
|
|
psize := uint64(1) << next
|
|
// e.g: if the number is 0b010100, psize will be 0b000100
|
|
|
|
// set that bit to 0 by XORing it, so the next iteration looks at the
|
|
// next bit
|
|
toFill ^= psize
|
|
|
|
// Add the piece size to the list of pieces we need to create
|
|
out[i] = abi.PaddedPieceSize(psize).Unpadded()
|
|
}
|
|
return out, nil
|
|
}
|
|
|
|
func (m *Sealing) fastPledgeCommitment(size abi.UnpaddedPieceSize, parts uint64) (commP [sectorbuilder.CommLen]byte, err error) {
|
|
parts = 1 << bits.Len64(parts) // round down to nearest power of 2
|
|
if uint64(size)/parts < 127 {
|
|
parts = uint64(size) / 127
|
|
}
|
|
|
|
piece := abi.PaddedPieceSize(uint64(size.Padded()) / parts).Unpadded()
|
|
out := make([]sectorbuilder.PublicPieceInfo, parts)
|
|
var lk sync.Mutex
|
|
|
|
var wg sync.WaitGroup
|
|
wg.Add(int(parts))
|
|
for i := uint64(0); i < parts; i++ {
|
|
go func(i uint64) {
|
|
defer wg.Done()
|
|
|
|
commP, perr := sectorbuilder.GeneratePieceCommitment(io.LimitReader(rand.New(rand.NewSource(42+int64(i))), int64(piece)), piece)
|
|
|
|
lk.Lock()
|
|
if perr != nil {
|
|
err = multierror.Append(err, perr)
|
|
}
|
|
out[i] = sectorbuilder.PublicPieceInfo{
|
|
Size: uint64(piece),
|
|
CommP: commP,
|
|
}
|
|
lk.Unlock()
|
|
}(i)
|
|
}
|
|
wg.Wait()
|
|
|
|
if err != nil {
|
|
return [32]byte{}, err
|
|
}
|
|
|
|
return sectorbuilder.GenerateDataCommitment(m.sb.SectorSize(), out)
|
|
}
|
|
|
|
func (m *Sealing) ListSectors() ([]SectorInfo, error) {
|
|
var sectors []SectorInfo
|
|
if err := m.sectors.List(§ors); err != nil {
|
|
return nil, err
|
|
}
|
|
return sectors, nil
|
|
}
|
|
|
|
func (m *Sealing) GetSectorInfo(sid uint64) (SectorInfo, error) {
|
|
var out SectorInfo
|
|
err := m.sectors.Get(sid).Get(&out)
|
|
return out, err
|
|
}
|