mirror of
https://github.com/lightninglabs/loop
synced 2024-11-13 13:10:30 +00:00
138 lines
3.1 KiB
Go
138 lines
3.1 KiB
Go
package reservation
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import (
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"bytes"
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"errors"
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"fmt"
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"github.com/btcsuite/btcd/btcec/v2"
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"github.com/btcsuite/btcd/btcutil"
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"github.com/btcsuite/btcd/wire"
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"github.com/lightninglabs/loop/fsm"
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reservation_script "github.com/lightninglabs/loop/instantout/reservation/script"
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"github.com/lightningnetwork/lnd/keychain"
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)
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// ID is a unique identifier for a reservation.
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type ID [IdLength]byte
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// FromByteSlice creates a reservation id from a byte slice.
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func (r *ID) FromByteSlice(b []byte) error {
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if len(b) != IdLength {
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return fmt.Errorf("reservation id must be 32 bytes, got %d, %x",
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len(b), b)
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}
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copy(r[:], b)
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return nil
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}
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// Reservation holds all the necessary information for the 2-of-2 multisig
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// reservation utxo.
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type Reservation struct {
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// ID is the unique identifier of the reservation.
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ID ID
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// State is the current state of the reservation.
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State fsm.StateType
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// ClientPubkey is the client's pubkey.
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ClientPubkey *btcec.PublicKey
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// ServerPubkey is the server's pubkey.
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ServerPubkey *btcec.PublicKey
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// Value is the amount of the reservation.
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Value btcutil.Amount
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// Expiry is the absolute block height at which the reservation expires.
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Expiry uint32
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// KeyLocator is the key locator of the client's key.
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KeyLocator keychain.KeyLocator
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// Outpoint is the outpoint of the reservation.
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Outpoint *wire.OutPoint
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// InitiationHeight is the height at which the reservation was
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// initiated.
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InitiationHeight int32
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// ConfirmationHeight is the height at which the reservation was
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// confirmed.
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ConfirmationHeight uint32
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}
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func NewReservation(id ID, serverPubkey, clientPubkey *btcec.PublicKey,
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value btcutil.Amount, expiry, heightHint uint32,
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keyLocator keychain.KeyLocator) (*Reservation,
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error) {
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if id == [32]byte{} {
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return nil, errors.New("id is empty")
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}
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if clientPubkey == nil {
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return nil, errors.New("client pubkey is nil")
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}
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if serverPubkey == nil {
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return nil, errors.New("server pubkey is nil")
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}
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if expiry == 0 {
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return nil, errors.New("expiry is 0")
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}
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if value == 0 {
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return nil, errors.New("value is 0")
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}
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if keyLocator.Family == 0 {
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return nil, errors.New("key locator family is 0")
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}
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return &Reservation{
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ID: id,
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Value: value,
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ClientPubkey: clientPubkey,
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ServerPubkey: serverPubkey,
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KeyLocator: keyLocator,
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Expiry: expiry,
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InitiationHeight: int32(heightHint),
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}, nil
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}
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// GetPkScript returns the pk script of the reservation.
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func (r *Reservation) GetPkScript() ([]byte, error) {
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// Now that we have all the required data, we can create the pk script.
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pkScript, err := reservation_script.ReservationScript(
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r.Expiry, r.ServerPubkey, r.ClientPubkey,
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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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return pkScript, nil
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}
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func (r *Reservation) findReservationOutput(tx *wire.MsgTx) (*wire.OutPoint,
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error) {
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pkScript, err := r.GetPkScript()
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if err != nil {
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return nil, err
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}
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for i, txOut := range tx.TxOut {
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if bytes.Equal(txOut.PkScript, pkScript) {
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return &wire.OutPoint{
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Hash: tx.TxHash(),
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Index: uint32(i),
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}, nil
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}
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}
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return nil, errors.New("reservation output not found")
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}
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