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