lotus/chain/actors/actor_paych.go

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package actors
import (
"bytes"
"fmt"
"github.com/ipfs/go-cid"
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"github.com/minio/blake2b-simd"
"github.com/filecoin-project/go-address"
"github.com/filecoin-project/lotus/build"
"github.com/filecoin-project/lotus/chain/actors/aerrors"
"github.com/filecoin-project/lotus/chain/types"
)
type PaymentChannelActor struct{}
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type PaymentInfo struct {
PayChActor address.Address
Payer address.Address
ChannelMessage *cid.Cid
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Vouchers []*types.SignedVoucher
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}
type LaneState struct {
Closed bool
Redeemed types.BigInt
Nonce uint64
}
type PaymentChannelActorState struct {
From address.Address
To address.Address
ToSend types.BigInt
ClosingAt uint64
MinCloseHeight uint64
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// TODO: needs to be map[uint64]*laneState
// waiting on refmt#35 to be fixed
LaneStates map[string]*LaneState
}
func (pca PaymentChannelActor) Exports() []interface{} {
return []interface{}{
1: pca.Constructor,
2: pca.UpdateChannelState,
3: pca.Close,
4: pca.Collect,
5: pca.GetOwner,
6: pca.GetToSend,
}
}
type pcaMethods struct {
Constructor uint64
UpdateChannelState uint64
Close uint64
Collect uint64
GetOwner uint64
GetToSend uint64
}
var PCAMethods = pcaMethods{1, 2, 3, 4, 5, 6}
type PCAConstructorParams struct {
To address.Address
}
func (pca PaymentChannelActor) Constructor(act *types.Actor, vmctx types.VMContext, params *PCAConstructorParams) ([]byte, ActorError) {
var self PaymentChannelActorState
self.From = vmctx.Origin()
self.To = params.To
self.LaneStates = make(map[string]*LaneState)
storage := vmctx.Storage()
c, err := storage.Put(&self)
if err != nil {
return nil, err
}
if err := storage.Commit(EmptyCBOR, c); err != nil {
return nil, err
}
return nil, nil
}
type PCAUpdateChannelStateParams struct {
Sv types.SignedVoucher
Secret []byte
Proof []byte
}
func hash(b []byte) []byte {
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s := blake2b.Sum256(b)
return s[:]
}
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type PaymentVerifyParams struct {
Extra []byte
Proof []byte
}
func (pca PaymentChannelActor) UpdateChannelState(act *types.Actor, vmctx types.VMContext, params *PCAUpdateChannelStateParams) ([]byte, ActorError) {
var self PaymentChannelActorState
oldstate := vmctx.Storage().GetHead()
storage := vmctx.Storage()
if err := storage.Get(oldstate, &self); err != nil {
return nil, err
}
sv := params.Sv
vb, nerr := sv.SigningBytes()
if nerr != nil {
return nil, aerrors.Escalate(nerr, "failed to serialize signedvoucher")
}
if err := vmctx.VerifySignature(sv.Signature, self.From, vb); err != nil {
return nil, err
}
if vmctx.BlockHeight() < sv.TimeLock {
return nil, aerrors.New(2, "cannot use this voucher yet!")
}
if len(sv.SecretPreimage) > 0 {
if !bytes.Equal(hash(params.Secret), sv.SecretPreimage) {
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return nil, aerrors.New(3, "incorrect secret!")
}
}
if sv.Extra != nil {
encoded, err := SerializeParams(&PaymentVerifyParams{sv.Extra.Data, params.Proof})
if err != nil {
return nil, err
}
_, err = vmctx.Send(sv.Extra.Actor, sv.Extra.Method, types.NewInt(0), encoded)
if err != nil {
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return nil, aerrors.Newf(4, "spend voucher verification failed: %s", err)
}
}
ls, ok := self.LaneStates[fmt.Sprint(sv.Lane)]
if !ok {
ls = new(LaneState)
ls.Redeemed = types.NewInt(0) // TODO: kinda annoying that this doesnt default to a usable value
self.LaneStates[fmt.Sprint(sv.Lane)] = ls
}
if ls.Closed {
return nil, aerrors.New(5, "cannot redeem a voucher on a closed lane")
}
if ls.Nonce > sv.Nonce {
return nil, aerrors.New(6, "voucher has an outdated nonce, cannot redeem")
}
mergeValue := types.NewInt(0)
for _, merge := range sv.Merges {
if merge.Lane == sv.Lane {
return nil, aerrors.New(7, "voucher cannot merge its own lane")
}
ols := self.LaneStates[fmt.Sprint(merge.Lane)]
if ols.Nonce >= merge.Nonce {
return nil, aerrors.New(8, "merge in voucher has outdated nonce, cannot redeem")
}
mergeValue = types.BigAdd(mergeValue, ols.Redeemed)
ols.Nonce = merge.Nonce
}
ls.Nonce = sv.Nonce
balanceDelta := types.BigSub(sv.Amount, types.BigAdd(mergeValue, ls.Redeemed))
ls.Redeemed = sv.Amount
newSendBalance := types.BigAdd(self.ToSend, balanceDelta)
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if newSendBalance.LessThan(types.NewInt(0)) {
// TODO: is this impossible?
return nil, aerrors.New(9, "voucher would leave channel balance negative")
}
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if newSendBalance.GreaterThan(act.Balance) {
return nil, aerrors.New(10, "not enough funds in channel to cover voucher")
}
log.Info("vals: ", newSendBalance, sv.Amount, balanceDelta, mergeValue, ls.Redeemed)
self.ToSend = newSendBalance
if sv.MinCloseHeight != 0 {
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if self.ClosingAt != 0 && self.ClosingAt < sv.MinCloseHeight {
self.ClosingAt = sv.MinCloseHeight
}
if self.MinCloseHeight < sv.MinCloseHeight {
self.MinCloseHeight = sv.MinCloseHeight
}
}
ncid, err := storage.Put(&self)
if err != nil {
return nil, err
}
if err := storage.Commit(oldstate, ncid); err != nil {
return nil, err
}
return nil, nil
}
func (pca PaymentChannelActor) Close(act *types.Actor, vmctx types.VMContext, params *struct{}) ([]byte, aerrors.ActorError) {
var self PaymentChannelActorState
storage := vmctx.Storage()
oldstate := storage.GetHead()
if err := storage.Get(oldstate, &self); err != nil {
return nil, err
}
if vmctx.Message().From != self.From && vmctx.Message().From != self.To {
return nil, aerrors.New(1, "not authorized to close channel")
}
if self.ClosingAt != 0 {
return nil, aerrors.New(2, "channel already closing")
}
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self.ClosingAt = vmctx.BlockHeight() + build.PaymentChannelClosingDelay
if self.ClosingAt < self.MinCloseHeight {
self.ClosingAt = self.MinCloseHeight
}
ncid, err := storage.Put(&self)
if err != nil {
return nil, err
}
if err := storage.Commit(oldstate, ncid); err != nil {
return nil, err
}
return nil, nil
}
func (pca PaymentChannelActor) Collect(act *types.Actor, vmctx types.VMContext, params *struct{}) ([]byte, aerrors.ActorError) {
var self PaymentChannelActorState
storage := vmctx.Storage()
oldstate := storage.GetHead()
if err := storage.Get(oldstate, &self); err != nil {
return nil, err
}
if self.ClosingAt == 0 {
return nil, aerrors.New(1, "payment channel not closing or closed")
}
if vmctx.BlockHeight() < self.ClosingAt {
return nil, aerrors.New(2, "payment channel not closed yet")
}
_, err := vmctx.Send(self.From, 0, types.BigSub(act.Balance, self.ToSend), nil)
if err != nil {
return nil, err
}
_, err = vmctx.Send(self.To, 0, self.ToSend, nil)
if err != nil {
return nil, err
}
self.ToSend = types.NewInt(0)
ncid, err := storage.Put(&self)
if err != nil {
return nil, err
}
if err := storage.Commit(oldstate, ncid); err != nil {
return nil, err
}
return nil, nil
}
func (pca PaymentChannelActor) GetOwner(act *types.Actor, vmctx types.VMContext, params *struct{}) ([]byte, aerrors.ActorError) {
var self PaymentChannelActorState
storage := vmctx.Storage()
if err := storage.Get(storage.GetHead(), &self); err != nil {
return nil, err
}
return self.From.Bytes(), nil
}
func (pca PaymentChannelActor) GetToSend(act *types.Actor, vmctx types.VMContext, params *struct{}) ([]byte, aerrors.ActorError) {
var self PaymentChannelActorState
storage := vmctx.Storage()
if err := storage.Get(storage.GetHead(), &self); err != nil {
return nil, err
}
return self.ToSend.Bytes(), nil
}