296 lines
7.2 KiB
Go
296 lines
7.2 KiB
Go
package actors
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import (
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"bytes"
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"fmt"
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"github.com/ipfs/go-cid"
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"github.com/filecoin-project/lotus/build"
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"github.com/filecoin-project/lotus/chain/actors/aerrors"
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"github.com/filecoin-project/lotus/chain/address"
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"github.com/filecoin-project/lotus/chain/types"
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)
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type PaymentChannelActor struct{}
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type PaymentInfo struct {
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PayChActor address.Address
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Payer address.Address
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ChannelMessage *cid.Cid
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Vouchers []*types.SignedVoucher
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}
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type LaneState struct {
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Closed bool
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Redeemed types.BigInt
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Nonce uint64
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}
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type PaymentChannelActorState struct {
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From address.Address
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To address.Address
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ToSend types.BigInt
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ClosingAt uint64
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MinCloseHeight uint64
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// TODO: needs to be map[uint64]*laneState
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// waiting on refmt#35 to be fixed
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LaneStates map[string]*LaneState
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}
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func (pca PaymentChannelActor) Exports() []interface{} {
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return []interface{}{
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1: pca.Constructor,
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2: pca.UpdateChannelState,
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3: pca.Close,
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4: pca.Collect,
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5: pca.GetOwner,
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6: pca.GetToSend,
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}
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}
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type pcaMethods struct {
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Constructor uint64
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UpdateChannelState uint64
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Close uint64
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Collect uint64
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GetOwner uint64
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GetToSend uint64
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}
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var PCAMethods = pcaMethods{1, 2, 3, 4, 5, 6}
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type PCAConstructorParams struct {
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To address.Address
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}
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func (pca PaymentChannelActor) Constructor(act *types.Actor, vmctx types.VMContext, params *PCAConstructorParams) ([]byte, ActorError) {
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var self PaymentChannelActorState
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self.From = vmctx.Origin()
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self.To = params.To
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self.LaneStates = make(map[string]*LaneState)
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storage := vmctx.Storage()
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c, err := storage.Put(&self)
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if err != nil {
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return nil, err
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}
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if err := storage.Commit(EmptyCBOR, c); err != nil {
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return nil, err
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}
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return nil, nil
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}
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type PCAUpdateChannelStateParams struct {
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Sv types.SignedVoucher
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Secret []byte
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Proof []byte
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}
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func hash(b []byte) []byte {
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panic("blake 2b hash pls")
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}
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func (pca PaymentChannelActor) UpdateChannelState(act *types.Actor, vmctx types.VMContext, params *PCAUpdateChannelStateParams) ([]byte, ActorError) {
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var self PaymentChannelActorState
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oldstate := vmctx.Storage().GetHead()
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storage := vmctx.Storage()
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if err := storage.Get(oldstate, &self); err != nil {
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return nil, err
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}
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sv := params.Sv
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vb, nerr := sv.SigningBytes()
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if nerr != nil {
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return nil, aerrors.Escalate(nerr, "failed to serialize signedvoucher")
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}
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if err := vmctx.VerifySignature(sv.Signature, self.From, vb); err != nil {
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return nil, err
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}
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if vmctx.BlockHeight() < sv.TimeLock {
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return nil, aerrors.New(2, "cannot use this voucher yet!")
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}
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if len(sv.SecretPreimage) > 0 {
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if !bytes.Equal(hash(params.Secret), sv.SecretPreimage) {
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return nil, aerrors.New(3, "incorrect secret!")
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}
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}
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if sv.Extra != nil {
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encoded, err := SerializeParams(&PaymentVerifyParams{sv.Extra.Data, params.Proof})
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if err != nil {
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return nil, err
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}
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_, err = vmctx.Send(sv.Extra.Actor, sv.Extra.Method, types.NewInt(0), encoded)
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if err != nil {
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return nil, aerrors.Newf(4, "spend voucher verification failed: %s", err)
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}
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}
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ls, ok := self.LaneStates[fmt.Sprint(sv.Lane)]
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if !ok {
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ls = new(LaneState)
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ls.Redeemed = types.NewInt(0) // TODO: kinda annoying that this doesnt default to a usable value
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self.LaneStates[fmt.Sprint(sv.Lane)] = ls
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}
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if ls.Closed {
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return nil, aerrors.New(5, "cannot redeem a voucher on a closed lane")
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}
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if ls.Nonce > sv.Nonce {
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return nil, aerrors.New(6, "voucher has an outdated nonce, cannot redeem")
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}
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mergeValue := types.NewInt(0)
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for _, merge := range sv.Merges {
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if merge.Lane == sv.Lane {
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return nil, aerrors.New(7, "voucher cannot merge its own lane")
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}
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ols := self.LaneStates[fmt.Sprint(merge.Lane)]
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if ols.Nonce >= merge.Nonce {
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return nil, aerrors.New(8, "merge in voucher has outdated nonce, cannot redeem")
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}
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mergeValue = types.BigAdd(mergeValue, ols.Redeemed)
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ols.Nonce = merge.Nonce
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}
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ls.Nonce = sv.Nonce
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balanceDelta := types.BigSub(sv.Amount, types.BigAdd(mergeValue, ls.Redeemed))
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ls.Redeemed = sv.Amount
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newSendBalance := types.BigAdd(self.ToSend, balanceDelta)
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if newSendBalance.LessThan(types.NewInt(0)) {
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// TODO: is this impossible?
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return nil, aerrors.New(9, "voucher would leave channel balance negative")
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}
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if newSendBalance.GreaterThan(act.Balance) {
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return nil, aerrors.New(10, "not enough funds in channel to cover voucher")
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}
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log.Info("vals: ", newSendBalance, sv.Amount, balanceDelta, mergeValue, ls.Redeemed)
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self.ToSend = newSendBalance
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if sv.MinCloseHeight != 0 {
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if self.ClosingAt != 0 && self.ClosingAt < sv.MinCloseHeight {
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self.ClosingAt = sv.MinCloseHeight
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}
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if self.MinCloseHeight < sv.MinCloseHeight {
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self.MinCloseHeight = sv.MinCloseHeight
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}
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}
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ncid, err := storage.Put(&self)
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if err != nil {
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return nil, err
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}
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if err := storage.Commit(oldstate, ncid); err != nil {
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return nil, err
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}
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return nil, nil
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}
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func (pca PaymentChannelActor) Close(act *types.Actor, vmctx types.VMContext, params *struct{}) ([]byte, aerrors.ActorError) {
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var self PaymentChannelActorState
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storage := vmctx.Storage()
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oldstate := storage.GetHead()
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if err := storage.Get(oldstate, &self); err != nil {
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return nil, err
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}
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if vmctx.Message().From != self.From && vmctx.Message().From != self.To {
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return nil, aerrors.New(1, "not authorized to close channel")
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}
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if self.ClosingAt != 0 {
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return nil, aerrors.New(2, "channel already closing")
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}
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self.ClosingAt = vmctx.BlockHeight() + build.PaymentChannelClosingDelay
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if self.ClosingAt < self.MinCloseHeight {
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self.ClosingAt = self.MinCloseHeight
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}
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ncid, err := storage.Put(&self)
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if err != nil {
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return nil, err
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}
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if err := storage.Commit(oldstate, ncid); err != nil {
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return nil, err
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}
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return nil, nil
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}
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func (pca PaymentChannelActor) Collect(act *types.Actor, vmctx types.VMContext, params *struct{}) ([]byte, aerrors.ActorError) {
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var self PaymentChannelActorState
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storage := vmctx.Storage()
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oldstate := storage.GetHead()
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if err := storage.Get(oldstate, &self); err != nil {
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return nil, err
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}
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if self.ClosingAt == 0 {
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return nil, aerrors.New(1, "payment channel not closing or closed")
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}
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if vmctx.BlockHeight() < self.ClosingAt {
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return nil, aerrors.New(2, "payment channel not closed yet")
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}
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_, err := vmctx.Send(self.From, 0, types.BigSub(act.Balance, self.ToSend), nil)
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if err != nil {
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return nil, err
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}
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_, err = vmctx.Send(self.To, 0, self.ToSend, nil)
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if err != nil {
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return nil, err
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}
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self.ToSend = types.NewInt(0)
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ncid, err := storage.Put(&self)
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if err != nil {
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return nil, err
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}
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if err := storage.Commit(oldstate, ncid); err != nil {
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return nil, err
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}
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return nil, nil
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}
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func (pca PaymentChannelActor) GetOwner(act *types.Actor, vmctx types.VMContext, params *struct{}) ([]byte, aerrors.ActorError) {
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var self PaymentChannelActorState
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storage := vmctx.Storage()
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if err := storage.Get(storage.GetHead(), &self); err != nil {
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return nil, err
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}
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return self.From.Bytes(), nil
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}
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func (pca PaymentChannelActor) GetToSend(act *types.Actor, vmctx types.VMContext, params *struct{}) ([]byte, aerrors.ActorError) {
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var self PaymentChannelActorState
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storage := vmctx.Storage()
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if err := storage.Get(storage.GetHead(), &self); err != nil {
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return nil, err
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}
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return self.ToSend.Bytes(), nil
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}
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