lotus/node/impl/full/paych.go

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package full
import (
"context"
"fmt"
"github.com/filecoin-project/go-lotus/api"
"github.com/filecoin-project/go-lotus/chain/actors"
"github.com/filecoin-project/go-lotus/chain/address"
"github.com/filecoin-project/go-lotus/chain/types"
"github.com/filecoin-project/go-lotus/paych"
"github.com/ipfs/go-cid"
"go.uber.org/fx"
"golang.org/x/xerrors"
)
type PaychAPI struct {
fx.In
MpoolAPI
WalletAPI
ChainAPI
PaychMgr *paych.Manager
}
func (a *PaychAPI) PaychCreate(ctx context.Context, from, to address.Address, amt types.BigInt) (address.Address, error) {
params, aerr := actors.SerializeParams(&actors.PCAConstructorParams{To: to})
if aerr != nil {
return address.Undef, aerr
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}
nonce, err := a.MpoolGetNonce(ctx, from)
if err != nil {
return address.Undef, err
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}
enc, err := actors.SerializeParams(&actors.ExecParams{
Params: params,
Code: actors.PaymentChannelActorCodeCid,
})
msg := &types.Message{
To: actors.InitActorAddress,
From: from,
Value: amt,
Nonce: nonce,
Method: actors.IAMethods.Exec,
Params: enc,
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GasLimit: types.NewInt(1000000),
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GasPrice: types.NewInt(0),
}
smsg, err := a.WalletSignMessage(ctx, from, msg)
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if err != nil {
return address.Address{}, err
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}
if err := a.MpoolPush(ctx, smsg); err != nil {
return address.Undef, err
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}
mwait, err := a.ChainWaitMsg(ctx, smsg.Cid())
if err != nil {
return address.Undef, err
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}
if mwait.Receipt.ExitCode != 0 {
return address.Undef, fmt.Errorf("payment channel creation failed (exit code %d)", mwait.Receipt.ExitCode)
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}
paychaddr, err := address.NewFromBytes(mwait.Receipt.Return)
if err != nil {
return address.Undef, err
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}
if err := a.PaychMgr.TrackOutboundChannel(ctx, paychaddr); err != nil {
return address.Undef, err
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}
return paychaddr, nil
}
func (a *PaychAPI) PaychNewPayment(ctx context.Context, from, to address.Address, amount types.BigInt, extra *types.ModVerifyParams, tl uint64, minClose uint64) (*api.PaymentInfo, error) {
ch, err := a.PaychMgr.OutboundChanTo(from, to)
if err != nil {
return nil, err
}
if ch == address.Undef {
// don't have matching channel, open new
// TODO: this should be more atomic
ch, err = a.PaychCreate(ctx, from, to, amount)
if err != nil {
return nil, err
}
} else {
// already have chanel to the destination, add funds, and open a new lane
// TODO: track free funds in channel
nonce, err := a.MpoolGetNonce(ctx, from)
if err != nil {
return nil, err
}
msg := &types.Message{
To: ch,
From: from,
Value: amount,
Nonce: nonce,
Method: 0,
GasLimit: types.NewInt(1000000),
GasPrice: types.NewInt(0),
}
smsg, err := a.WalletSignMessage(ctx, from, msg)
if err != nil {
return nil, err
}
if err := a.MpoolPush(ctx, smsg); err != nil {
return nil, err
}
mwait, err := a.ChainWaitMsg(ctx, smsg.Cid())
if err != nil {
return nil, err
}
if mwait.Receipt.ExitCode != 0 {
return nil, fmt.Errorf("voucher channel creation failed: adding funds (exit code %d)", mwait.Receipt.ExitCode)
}
}
lane, err := a.PaychMgr.AllocateLane(ch)
if err != nil {
return nil, err
}
sv, err := a.paychVoucherCreate(ctx, ch, types.SignedVoucher{
Amount: amount,
Lane: lane,
Extra: extra,
TimeLock: tl,
MinCloseHeight: minClose,
})
if err != nil {
return nil, err
}
return &api.PaymentInfo{
Channel: ch,
Voucher: sv,
}, nil
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}
func (a *PaychAPI) PaychList(ctx context.Context) ([]address.Address, error) {
return a.PaychMgr.ListChannels()
}
func (a *PaychAPI) PaychStatus(ctx context.Context, pch address.Address) (*api.PaychStatus, error) {
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ci, err := a.PaychMgr.GetChannelInfo(pch)
if err != nil {
return nil, err
}
return &api.PaychStatus{
ControlAddr: ci.Control,
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Direction: api.PCHDir(ci.Direction),
}, nil
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}
func (a *PaychAPI) PaychClose(ctx context.Context, addr address.Address) (cid.Cid, error) {
ci, err := a.PaychMgr.GetChannelInfo(addr)
if err != nil {
return cid.Undef, err
}
nonce, err := a.MpoolGetNonce(ctx, ci.Control)
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if err != nil {
return cid.Undef, err
}
msg := &types.Message{
To: addr,
From: ci.Control,
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Value: types.NewInt(0),
Method: actors.PCAMethods.Close,
Nonce: nonce,
GasLimit: types.NewInt(500),
GasPrice: types.NewInt(0),
}
smsg, err := a.WalletSignMessage(ctx, ci.Control, msg)
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if err != nil {
return cid.Undef, err
}
if err := a.MpoolPush(ctx, smsg); err != nil {
return cid.Undef, err
}
return smsg.Cid(), nil
}
func (a *PaychAPI) PaychVoucherCheckValid(ctx context.Context, ch address.Address, sv *types.SignedVoucher) error {
return a.PaychMgr.CheckVoucherValid(ctx, ch, sv)
}
func (a *PaychAPI) PaychVoucherCheckSpendable(ctx context.Context, ch address.Address, sv *types.SignedVoucher, secret []byte, proof []byte) (bool, error) {
return a.PaychMgr.CheckVoucherSpendable(ctx, ch, sv, secret, proof)
}
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func (a *PaychAPI) PaychVoucherAdd(ctx context.Context, ch address.Address, sv *types.SignedVoucher, proof []byte) error {
_ = a.PaychMgr.TrackInboundChannel(ctx, ch) // TODO: expose those calls
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if err := a.PaychVoucherCheckValid(ctx, ch, sv); err != nil {
return err
}
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return a.PaychMgr.AddVoucher(ctx, ch, sv, proof)
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}
// PaychVoucherCreate creates a new signed voucher on the given payment channel
// with the given lane and amount. The value passed in is exactly the value
// that will be used to create the voucher, so if previous vouchers exist, the
// actual additional value of this voucher will only be the difference between
// the two.
func (a *PaychAPI) PaychVoucherCreate(ctx context.Context, pch address.Address, amt types.BigInt, lane uint64) (*types.SignedVoucher, error) {
return a.paychVoucherCreate(ctx, pch, types.SignedVoucher{Amount: amt, Lane: lane})
}
func (a *PaychAPI) paychVoucherCreate(ctx context.Context, pch address.Address, voucher types.SignedVoucher) (*types.SignedVoucher, error) {
ci, err := a.PaychMgr.GetChannelInfo(pch)
if err != nil {
return nil, err
}
nonce, err := a.PaychMgr.NextNonceForLane(ctx, pch, voucher.Lane)
if err != nil {
return nil, err
}
sv := &voucher
sv.Nonce = nonce
vb, err := sv.SigningBytes()
if err != nil {
return nil, err
}
sig, err := a.WalletSign(ctx, ci.Control, vb)
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if err != nil {
return nil, err
}
sv.Signature = sig
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if err := a.PaychMgr.AddVoucher(ctx, pch, sv, nil); err != nil {
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return nil, xerrors.Errorf("failed to persist voucher: %w", err)
}
return sv, nil
}
func (a *PaychAPI) PaychVoucherList(ctx context.Context, pch address.Address) ([]*types.SignedVoucher, error) {
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vi, err := a.PaychMgr.ListVouchers(ctx, pch)
if err != nil {
return nil, err
}
out := make([]*types.SignedVoucher, len(vi))
for k, v := range vi {
out[k] = v.Voucher
}
return out, nil
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}
func (a *PaychAPI) PaychVoucherSubmit(ctx context.Context, ch address.Address, sv *types.SignedVoucher) (cid.Cid, error) {
ci, err := a.PaychMgr.GetChannelInfo(ch)
if err != nil {
return cid.Undef, err
}
nonce, err := a.MpoolGetNonce(ctx, ci.Control)
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if err != nil {
return cid.Undef, err
}
if sv.Extra != nil || len(sv.SecretPreimage) > 0 {
return cid.Undef, fmt.Errorf("cant handle more advanced payment channel stuff yet")
}
enc, err := actors.SerializeParams(&actors.PCAUpdateChannelStateParams{
Sv: *sv,
})
if err != nil {
return cid.Undef, err
}
msg := &types.Message{
From: ci.Control,
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To: ch,
Value: types.NewInt(0),
Nonce: nonce,
Method: actors.PCAMethods.UpdateChannelState,
Params: enc,
GasLimit: types.NewInt(100000),
GasPrice: types.NewInt(0),
}
smsg, err := a.WalletSignMessage(ctx, ci.Control, msg)
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if err != nil {
return cid.Undef, err
}
if err := a.MpoolPush(ctx, smsg); err != nil {
return cid.Undef, err
}
// TODO: should we wait for it...?
return smsg.Cid(), nil
}