lotus/extern/sector-storage/roprov.go
2020-09-07 15:48:41 -04:00

41 lines
1.1 KiB
Go

package sectorstorage
import (
"context"
"golang.org/x/xerrors"
"github.com/filecoin-project/go-state-types/abi"
"github.com/filecoin-project/lotus/extern/sector-storage/stores"
)
type readonlyProvider struct {
index stores.SectorIndex
stor *stores.Local
spt abi.RegisteredSealProof
}
func (l *readonlyProvider) AcquireSector(ctx context.Context, id abi.SectorID, existing stores.SectorFileType, allocate stores.SectorFileType, sealing stores.PathType) (stores.SectorPaths, func(), error) {
if allocate != stores.FTNone {
return stores.SectorPaths{}, nil, xerrors.New("read-only storage")
}
ctx, cancel := context.WithCancel(ctx)
// use TryLock to avoid blocking
locked, err := l.index.StorageTryLock(ctx, id, existing, stores.FTNone)
if err != nil {
cancel()
return stores.SectorPaths{}, nil, xerrors.Errorf("acquiring sector lock: %w", err)
}
if !locked {
cancel()
return stores.SectorPaths{}, nil, xerrors.Errorf("failed to acquire sector lock")
}
p, _, err := l.stor.AcquireSector(ctx, id, l.spt, existing, allocate, sealing, stores.AcquireMove)
return p, cancel, err
}