lnd.xprv/lnwallet/reservation.go
2016-01-14 23:56:08 -08:00

197 lines
5.2 KiB
Go

package lnwallet
import (
"sync"
"li.lan/labs/plasma/channeldb"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
)
// ChannelContribution...
type ChannelContribution struct {
// Amount of funds contributed to the funding transaction.
FundingAmount btcutil.Amount
// Inputs to the funding transaction.
Inputs []*wire.TxIn
// Outputs to be used in the case that the total value of the fund
// ing inputs is greather than the total potential channel capacity.
ChangeOutputs []*wire.TxOut
// The key to be used for the funding transaction's P2SH multi-sig
// 2-of-2 output.
MultiSigKey *btcec.PublicKey
// The key to be used for this party's version of the commitment
// transaction.
CommitKey *btcec.PublicKey
// Address to be used for delivery of cleared channel funds in the scenario
// of a cooperative channel closure.
DeliveryAddress btcutil.Address
// Hash to be used as the revocation for the initial version of this
// party's commitment transaction.
RevocationHash [20]byte
// The delay (in blocks) to be used for the pay-to-self output in this
// party's version of the commitment transaction.
CsvDelay uint32
}
// ChannelReservation...
type ChannelReservation struct {
fundingType FundingType
// This mutex MUST be held when either reading or modifying any of the
// fields below.
sync.RWMutex
// For CLTV it is nLockTime, for CSV it's nSequence, for segwit it's
// not needed
fundingLockTime uint32
// In order of sorted inputs. Sorting is done in accordance
// to BIP-69: https://github.com/bitcoin/bips/blob/master/bip-0069.mediawiki.
ourFundingSigs [][]byte
theirFundingSigs [][]byte
// Our signature for their version of the commitment transaction.
ourCommitmentSig []byte
theirCommitmentSig []byte
ourContribution *ChannelContribution
theirContribution *ChannelContribution
partialState *channeldb.OpenChannel
// The ID of this reservation, used to uniquely track the reservation
// throughout its lifetime.
reservationID uint64
// A channel which will be sent on once the channel is considered
// 'open'. A channel is open once the funding transaction has reached
// a sufficient number of confirmations.
chanOpen chan *LightningChannel
wallet *LightningWallet
}
// newChannelReservation...
func newChannelReservation(t FundingType, fundingAmt btcutil.Amount,
minFeeRate btcutil.Amount, wallet *LightningWallet, id uint64) *ChannelReservation {
// TODO(roasbeef): CSV here, or on delay?
return &ChannelReservation{
fundingType: t,
ourContribution: &ChannelContribution{
FundingAmount: fundingAmt,
},
theirContribution: &ChannelContribution{
FundingAmount: fundingAmt,
},
partialState: &channeldb.OpenChannel{
// TODO(roasbeef): assumes balanced symmetric channels.
Capacity: fundingAmt * 2,
OurBalance: fundingAmt,
TheirBalance: fundingAmt,
MinFeePerKb: minFeeRate,
},
reservationID: id,
wallet: wallet,
}
}
// OurContribution...
// NOTE: This SHOULD NOT be modified.
func (r *ChannelReservation) OurContribution() *ChannelContribution {
r.RLock()
defer r.RUnlock()
return r.ourContribution
}
// ProcessContribution...
func (r *ChannelReservation) ProcessContribution(theirContribution *ChannelContribution) error {
errChan := make(chan error, 1)
r.wallet.msgChan <- &addContributionMsg{
pendingFundingID: r.reservationID,
contribution: theirContribution,
err: errChan,
}
return <-errChan
}
func (r *ChannelReservation) TheirContribution() *ChannelContribution {
r.RLock()
defer r.RUnlock()
return r.theirContribution
}
// OurSignatures...
func (r *ChannelReservation) OurSignatures() ([][]byte, []byte) {
r.RLock()
defer r.RUnlock()
return r.ourFundingSigs, r.ourCommitmentSig
}
// CompleteFundingReservation...
func (r *ChannelReservation) CompleteReservation(fundingSigs [][]byte,
commitmentSig []byte) error {
errChan := make(chan error, 1)
r.wallet.msgChan <- &addCounterPartySigsMsg{
pendingFundingID: r.reservationID,
theirFundingSigs: fundingSigs,
theirCommitmentSig: commitmentSig,
err: errChan,
}
return <-errChan
}
// OurSignatures...
func (r *ChannelReservation) TheirSignatures() ([][]byte, []byte) {
r.RLock()
defer r.RUnlock()
return r.theirFundingSigs, r.theirCommitmentSig
}
// FinalFundingTransaction...
func (r *ChannelReservation) FinalFundingTx() *wire.MsgTx {
r.RLock()
defer r.RUnlock()
return r.partialState.FundingTx
}
// RequestFundingReserveCancellation...
func (r *ChannelReservation) Cancel() error {
errChan := make(chan error, 1)
r.wallet.msgChan <- &fundingReserveCancelMsg{
pendingFundingID: r.reservationID,
err: errChan,
}
return <-errChan
}
// WaitForChannelOpen...
func (r *ChannelReservation) WaitForChannelOpen() *LightningChannel {
return nil
}
// * finish reset of tests
// * comment out stuff that'll need a node.
// * start on commitment side
// * implement rusty's shachain
// * set up logic to get notification from node when funding tx gets 6 deep.
// * prob spawn into ChainNotifier struct
// * create builder for initial funding transaction
// * fascade through the wallet, for signing and such.
// * channel should have active namespace to it's bucket, query at that point fo past commits etc