lotus/markets/retrievaladapter/client.go

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package retrievaladapter
import (
"bytes"
"context"
"github.com/filecoin-project/go-address"
"github.com/filecoin-project/go-fil-markets/retrievalmarket"
"github.com/filecoin-project/go-fil-markets/shared"
"github.com/filecoin-project/specs-actors/actors/abi"
initactor "github.com/filecoin-project/specs-actors/actors/builtin/init"
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"github.com/filecoin-project/specs-actors/actors/builtin/paych"
"github.com/filecoin-project/specs-actors/actors/runtime/exitcode"
"github.com/ipfs/go-cid"
"golang.org/x/xerrors"
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"github.com/filecoin-project/lotus/build"
"github.com/filecoin-project/lotus/node/impl/full"
payapi "github.com/filecoin-project/lotus/node/impl/paych"
"github.com/filecoin-project/lotus/paychmgr"
)
type retrievalClientNode struct {
chainapi full.ChainAPI
pmgr *paychmgr.Manager
payapi payapi.PaychAPI
}
// NewRetrievalClientNode returns a new node adapter for a retrieval client that talks to the
// Lotus Node
func NewRetrievalClientNode(pmgr *paychmgr.Manager, payapi payapi.PaychAPI, chainapi full.ChainAPI) retrievalmarket.RetrievalClientNode {
return &retrievalClientNode{pmgr: pmgr, payapi: payapi, chainapi: chainapi}
}
// GetOrCreatePaymentChannel sets up a new payment channel if one does not exist
// between a client and a miner and ensures the client has the given amount of
// funds available in the channel.
func (rcn *retrievalClientNode) GetOrCreatePaymentChannel(ctx context.Context, clientAddress address.Address, minerAddress address.Address, clientFundsAvailable abi.TokenAmount, tok shared.TipSetToken) (address.Address, cid.Cid, error) {
// TODO: respect the provided TipSetToken (a serialized TipSetKey) when
// querying the chain
return rcn.pmgr.GetPaych(ctx, clientAddress, minerAddress, clientFundsAvailable)
}
// Allocate late creates a lane within a payment channel so that calls to
// CreatePaymentVoucher will automatically make vouchers only for the difference
// in total
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func (rcn *retrievalClientNode) AllocateLane(paymentChannel address.Address) (uint64, error) {
return rcn.pmgr.AllocateLane(paymentChannel)
}
// CreatePaymentVoucher creates a new payment voucher in the given lane for a
// given payment channel so that all the payment vouchers in the lane add up
// to the given amount (so the payment voucher will be for the difference)
func (rcn *retrievalClientNode) CreatePaymentVoucher(ctx context.Context, paymentChannel address.Address, amount abi.TokenAmount, lane uint64, tok shared.TipSetToken) (*paych.SignedVoucher, error) {
// TODO: respect the provided TipSetToken (a serialized TipSetKey) when
// querying the chain
voucher, err := rcn.payapi.PaychVoucherCreate(ctx, paymentChannel, amount, lane)
if err != nil {
return nil, err
}
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return voucher, nil
}
func (rcn *retrievalClientNode) GetChainHead(ctx context.Context) (shared.TipSetToken, abi.ChainEpoch, error) {
head, err := rcn.chainapi.ChainHead(ctx)
if err != nil {
return nil, 0, err
}
return head.Key().Bytes(), head.Height(), nil
}
// WaitForPaymentChannelAddFunds waits messageCID to appear on chain. If it doesn't appear within
// defaultMsgWaitTimeout it returns error
func (rcn *retrievalClientNode) WaitForPaymentChannelAddFunds(messageCID cid.Cid) error {
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_, mr, err := rcn.chainapi.StateManager.WaitForMessage(context.TODO(), messageCID, build.MessageConfidence)
if err != nil {
return err
}
if mr.ExitCode != exitcode.Ok {
return xerrors.Errorf("wait for payment channel to add funds failed. exit code: %d", mr.ExitCode)
}
return nil
}
func (rcn *retrievalClientNode) WaitForPaymentChannelCreation(messageCID cid.Cid) (address.Address, error) {
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_, mr, err := rcn.chainapi.StateManager.WaitForMessage(context.TODO(), messageCID, build.MessageConfidence)
if err != nil {
return address.Undef, err
}
if mr.ExitCode != exitcode.Ok {
return address.Undef, xerrors.Errorf("payment channel creation failed. exit code: %d", mr.ExitCode)
}
var retval initactor.ExecReturn
if err := retval.UnmarshalCBOR(bytes.NewReader(mr.Return)); err != nil {
return address.Undef, err
}
return retval.RobustAddress, nil
}