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utxo.go
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utxo.go
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package wallet
import (
"errors"
"fmt"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/btcsuite/btcwallet/walletdb"
"github.com/p2pderivatives/dlc/pkg/wallet"
)
const (
unspentMinConf = 1
unspentMaxConf = 9999999
)
// ListUnspent returns unspent transactions.
// It asks the running bitcoind instance to return all known utxos for addresses managed by the wallet
func (w *Wallet) ListUnspent() (utxos []wallet.Utxo, err error) {
var addrs []btcutil.Address
err = walletdb.View(w.db, func(tx walletdb.ReadTx) error {
ns := tx.ReadBucket(waddrmgrNamespaceKey)
appendAddr := func(addr btcutil.Address) error {
addrs = append(addrs, addr)
return nil
}
return w.manager.ForEachActiveAddress(ns, appendAddr)
})
if err != nil {
return utxos, err
}
if addrs == nil {
return utxos, err
}
return w.rpc.ListUnspentMinMaxAddresses(
unspentMinConf, unspentMaxConf, addrs)
}
// SelectUnspent is an implementation of Wallet.SelectUnspent
func (w *Wallet) SelectUnspent(
amt, feePerTxIn, feePerTxOut btcutil.Amount,
) (utxos []wallet.Utxo, change btcutil.Amount, err error) {
var utxosAll []wallet.Utxo
utxosAll, err = w.ListUnspent()
if err != nil {
return
}
var total btcutil.Amount
var fee btcutil.Amount
var utxoAmt btcutil.Amount
for _, utxo := range utxosAll {
utxoAmt, err = btcutil.NewAmount(utxo.Amount)
if err != nil {
return
}
total += utxoAmt
fee += feePerTxIn
utxos = append(utxos, utxo)
if amt+fee == total {
return
} else if amt+fee < total {
change = total - (amt + fee)
fee += feePerTxOut
if amt+fee <= total {
return
}
}
}
err = fmt.Errorf("Not enough utxos")
return utxos, change, err
}
// UtxoByTxIn finds utxo by txin
func (w *Wallet) UtxoByTxIn(txin *wire.TxIn) (wallet.Utxo, error) {
txid := txin.PreviousOutPoint.Hash.String()
vout := txin.PreviousOutPoint.Index
utxos, err := w.ListUnspent()
if err != nil {
return wallet.Utxo{}, err
}
for _, utxo := range utxos {
if utxo.TxID == txid && utxo.Vout == vout {
return utxo, nil
}
}
return wallet.Utxo{}, errors.New("utxo isn't found")
}