lotus/markets/retrievaladapter/provider.go

package retrievaladapter

import (
	"context"
	"io"

	"github.com/filecoin-project/go-address"
	"github.com/filecoin-project/go-fil-markets/retrievalmarket"
	retrievaltoken "github.com/filecoin-project/go-fil-markets/shared/tokenamount"
	retrievaltypes "github.com/filecoin-project/go-fil-markets/shared/types"
	"github.com/filecoin-project/specs-actors/actors/abi"

	"github.com/filecoin-project/go-sectorbuilder"
	"github.com/filecoin-project/lotus/api"
	"github.com/filecoin-project/lotus/markets/utils"
	"github.com/filecoin-project/lotus/storage"
)

type retrievalProviderNode struct {
	miner *storage.Miner
	sb    sectorbuilder.Interface
	full  api.FullNode
}

// NewRetrievalProviderNode returns a new node adapter for a retrieval provider that talks to the
// Lotus Node
func NewRetrievalProviderNode(miner *storage.Miner, sb sectorbuilder.Interface, full api.FullNode) retrievalmarket.RetrievalProviderNode {
	return &retrievalProviderNode{miner, sb, full}
}

func (rpn *retrievalProviderNode) UnsealSector(ctx context.Context, sectorID abi.SectorNumber, offset uint64, length uint64) (io.ReadCloser, error) {
	si, err := rpn.miner.GetSectorInfo(sectorID)
	if err != nil {
		return nil, err
	}
	return rpn.sb.ReadPieceFromSealedSector(ctx, sectorID, sectorbuilder.UnpaddedByteIndex(offset), abi.UnpaddedPieceSize(length), si.Ticket.TicketBytes, si.CommD)
}

func (rpn *retrievalProviderNode) SavePaymentVoucher(ctx context.Context, paymentChannel address.Address, voucher *retrievaltypes.SignedVoucher, proof []byte, expectedAmount retrievaltoken.TokenAmount) (retrievaltoken.TokenAmount, error) {
	localVoucher, err := utils.FromSharedSignedVoucher(voucher)
	if err != nil {
		return retrievaltoken.FromInt(0), err
	}
	added, err := rpn.full.PaychVoucherAdd(ctx, paymentChannel, localVoucher, proof, utils.FromSharedTokenAmount(expectedAmount))
	return utils.ToSharedTokenAmount(added), err
}