259 lines
6.5 KiB
Go
259 lines
6.5 KiB
Go
package paych
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import (
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"context"
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"fmt"
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"github.com/filecoin-project/specs-actors/actors/builtin"
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"github.com/filecoin-project/specs-actors/actors/builtin/paych"
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"github.com/ipfs/go-cid"
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"go.uber.org/fx"
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"golang.org/x/xerrors"
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"github.com/filecoin-project/go-address"
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"github.com/filecoin-project/lotus/api"
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"github.com/filecoin-project/lotus/chain/actors"
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"github.com/filecoin-project/lotus/chain/types"
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full "github.com/filecoin-project/lotus/node/impl/full"
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"github.com/filecoin-project/lotus/paychmgr"
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)
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type PaychAPI struct {
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fx.In
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full.MpoolAPI
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full.WalletAPI
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full.ChainAPI
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PaychMgr *paychmgr.Manager
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}
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func (a *PaychAPI) PaychGet(ctx context.Context, from, to address.Address, ensureFunds types.BigInt) (*api.ChannelInfo, error) {
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ch, mcid, err := a.PaychMgr.GetPaych(ctx, from, to, ensureFunds)
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if err != nil {
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return nil, err
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}
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return &api.ChannelInfo{
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Channel: ch,
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ChannelMessage: mcid,
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}, nil
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}
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func (a *PaychAPI) PaychAllocateLane(ctx context.Context, ch address.Address) (uint64, error) {
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return a.PaychMgr.AllocateLane(ch)
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}
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func (a *PaychAPI) PaychNewPayment(ctx context.Context, from, to address.Address, vouchers []api.VoucherSpec) (*api.PaymentInfo, error) {
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amount := vouchers[len(vouchers)-1].Amount
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// TODO: Fix free fund tracking in PaychGet
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// TODO: validate voucher spec before locking funds
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ch, err := a.PaychGet(ctx, from, to, amount)
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if err != nil {
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return nil, err
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}
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lane, err := a.PaychMgr.AllocateLane(ch.Channel)
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if err != nil {
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return nil, err
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}
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svs := make([]*paych.SignedVoucher, len(vouchers))
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for i, v := range vouchers {
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sv, err := a.paychVoucherCreate(ctx, ch.Channel, paych.SignedVoucher{
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Amount: v.Amount,
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Lane: uint64(lane),
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Extra: v.Extra,
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TimeLockMin: v.TimeLockMin,
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TimeLockMax: v.TimeLockMax,
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MinSettleHeight: v.MinSettle,
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})
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if err != nil {
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return nil, err
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}
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svs[i] = sv
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}
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var pchCid *cid.Cid
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if ch.ChannelMessage != cid.Undef {
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pchCid = &ch.ChannelMessage
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}
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return &api.PaymentInfo{
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Channel: ch.Channel,
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ChannelMessage: pchCid,
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Vouchers: svs,
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}, nil
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}
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func (a *PaychAPI) PaychList(ctx context.Context) ([]address.Address, error) {
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return a.PaychMgr.ListChannels()
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}
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func (a *PaychAPI) PaychStatus(ctx context.Context, pch address.Address) (*api.PaychStatus, error) {
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ci, err := a.PaychMgr.GetChannelInfo(pch)
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if err != nil {
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return nil, err
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}
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return &api.PaychStatus{
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ControlAddr: ci.Control,
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Direction: api.PCHDir(ci.Direction),
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}, nil
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}
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func (a *PaychAPI) PaychClose(ctx context.Context, addr address.Address) (cid.Cid, error) {
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panic("TODO Settle logic")
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ci, err := a.PaychMgr.GetChannelInfo(addr)
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if err != nil {
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return cid.Undef, err
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}
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nonce, err := a.MpoolGetNonce(ctx, ci.Control)
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if err != nil {
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return cid.Undef, err
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}
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msg := &types.Message{
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To: addr,
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From: ci.Control,
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Value: types.NewInt(0),
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Method: builtin.MethodsPaych.Settle,
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Nonce: nonce,
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GasLimit: 500,
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GasPrice: types.NewInt(0),
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}
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smsg, err := a.WalletSignMessage(ctx, ci.Control, msg)
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if err != nil {
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return cid.Undef, err
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}
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if _, err := a.MpoolPush(ctx, smsg); err != nil {
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return cid.Undef, err
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}
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return smsg.Cid(), nil
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}
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func (a *PaychAPI) PaychVoucherCheckValid(ctx context.Context, ch address.Address, sv *paych.SignedVoucher) error {
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return a.PaychMgr.CheckVoucherValid(ctx, ch, sv)
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}
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func (a *PaychAPI) PaychVoucherCheckSpendable(ctx context.Context, ch address.Address, sv *paych.SignedVoucher, secret []byte, proof []byte) (bool, error) {
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return a.PaychMgr.CheckVoucherSpendable(ctx, ch, sv, secret, proof)
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}
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func (a *PaychAPI) PaychVoucherAdd(ctx context.Context, ch address.Address, sv *paych.SignedVoucher, proof []byte, minDelta types.BigInt) (types.BigInt, error) {
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_ = a.PaychMgr.TrackInboundChannel(ctx, ch) // TODO: expose those calls
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return a.PaychMgr.AddVoucher(ctx, ch, sv, proof, minDelta)
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}
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// PaychVoucherCreate creates a new signed voucher on the given payment channel
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// with the given lane and amount. The value passed in is exactly the value
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// that will be used to create the voucher, so if previous vouchers exist, the
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// actual additional value of this voucher will only be the difference between
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// the two.
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func (a *PaychAPI) PaychVoucherCreate(ctx context.Context, pch address.Address, amt types.BigInt, lane uint64) (*paych.SignedVoucher, error) {
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return a.paychVoucherCreate(ctx, pch, paych.SignedVoucher{Amount: amt, Lane: lane})
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}
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func (a *PaychAPI) paychVoucherCreate(ctx context.Context, pch address.Address, voucher paych.SignedVoucher) (*paych.SignedVoucher, error) {
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ci, err := a.PaychMgr.GetChannelInfo(pch)
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if err != nil {
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return nil, xerrors.Errorf("get channel info: %w", err)
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}
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nonce, err := a.PaychMgr.NextNonceForLane(ctx, pch, voucher.Lane)
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if err != nil {
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return nil, xerrors.Errorf("getting next nonce for lane: %w", err)
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}
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sv := &voucher
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sv.Nonce = nonce
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vb, err := sv.SigningBytes()
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if err != nil {
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return nil, err
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}
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sig, err := a.WalletSign(ctx, ci.Control, vb)
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if err != nil {
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return nil, err
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}
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sv.Signature = sig
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if _, err := a.PaychMgr.AddVoucher(ctx, pch, sv, nil, types.NewInt(0)); err != nil {
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return nil, xerrors.Errorf("failed to persist voucher: %w", err)
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}
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return sv, nil
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}
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func (a *PaychAPI) PaychVoucherList(ctx context.Context, pch address.Address) ([]*paych.SignedVoucher, error) {
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vi, err := a.PaychMgr.ListVouchers(ctx, pch)
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if err != nil {
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return nil, err
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}
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out := make([]*paych.SignedVoucher, len(vi))
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for k, v := range vi {
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out[k] = v.Voucher
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}
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return out, nil
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}
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func (a *PaychAPI) PaychVoucherSubmit(ctx context.Context, ch address.Address, sv *paych.SignedVoucher) (cid.Cid, error) {
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ci, err := a.PaychMgr.GetChannelInfo(ch)
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if err != nil {
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return cid.Undef, err
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}
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nonce, err := a.MpoolGetNonce(ctx, ci.Control)
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if err != nil {
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return cid.Undef, err
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}
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if sv.Extra != nil || len(sv.SecretPreimage) > 0 {
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return cid.Undef, fmt.Errorf("cant handle more advanced payment channel stuff yet")
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}
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enc, err := actors.SerializeParams(&paych.UpdateChannelStateParams{
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Sv: *sv,
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})
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if err != nil {
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return cid.Undef, err
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}
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msg := &types.Message{
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From: ci.Control,
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To: ch,
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Value: types.NewInt(0),
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Nonce: nonce,
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Method: builtin.MethodsPaych.UpdateChannelState,
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Params: enc,
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GasLimit: 100000,
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GasPrice: types.NewInt(0),
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}
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smsg, err := a.WalletSignMessage(ctx, ci.Control, msg)
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if err != nil {
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return cid.Undef, err
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}
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if _, err := a.MpoolPush(ctx, smsg); err != nil {
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return cid.Undef, err
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}
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// TODO: should we wait for it...?
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return smsg.Cid(), nil
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}
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