291 lines
9.0 KiB
Go
291 lines
9.0 KiB
Go
// Copyright (c) 2013-2017 The btcsuite developers
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// Copyright (c) 2015-2016 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package wallet
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import (
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"fmt"
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"sort"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcd/txscript"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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"github.com/btcsuite/btcwallet/waddrmgr"
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"github.com/btcsuite/btcwallet/wallet/txauthor"
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"github.com/btcsuite/btcwallet/walletdb"
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"github.com/btcsuite/btcwallet/wtxmgr"
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)
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// byAmount defines the methods needed to satisify sort.Interface to
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// sort credits by their output amount.
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type byAmount []wtxmgr.Credit
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func (s byAmount) Len() int { return len(s) }
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func (s byAmount) Less(i, j int) bool { return s[i].Amount < s[j].Amount }
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func (s byAmount) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
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func makeInputSource(eligible []wtxmgr.Credit) txauthor.InputSource {
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// Pick largest outputs first. This is only done for compatibility with
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// previous tx creation code, not because it's a good idea.
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sort.Sort(sort.Reverse(byAmount(eligible)))
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// Current inputs and their total value. These are closed over by the
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// returned input source and reused across multiple calls.
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currentTotal := btcutil.Amount(0)
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currentInputs := make([]*wire.TxIn, 0, len(eligible))
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currentScripts := make([][]byte, 0, len(eligible))
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currentInputValues := make([]btcutil.Amount, 0, len(eligible))
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return func(target btcutil.Amount) (btcutil.Amount, []*wire.TxIn,
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[]btcutil.Amount, [][]byte, error) {
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for currentTotal < target && len(eligible) != 0 {
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nextCredit := &eligible[0]
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eligible = eligible[1:]
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nextInput := wire.NewTxIn(&nextCredit.OutPoint, nil, nil)
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currentTotal += nextCredit.Amount
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currentInputs = append(currentInputs, nextInput)
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currentScripts = append(currentScripts, nextCredit.PkScript)
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currentInputValues = append(currentInputValues, nextCredit.Amount)
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}
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return currentTotal, currentInputs, currentInputValues, currentScripts, nil
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}
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}
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// secretSource is an implementation of txauthor.SecretSource for the wallet's
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// address manager.
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type secretSource struct {
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*waddrmgr.Manager
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addrmgrNs walletdb.ReadBucket
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}
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func (s secretSource) GetKey(addr btcutil.Address) (*btcec.PrivateKey, bool, error) {
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ma, err := s.Address(s.addrmgrNs, addr)
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if err != nil {
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return nil, false, err
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}
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mpka, ok := ma.(waddrmgr.ManagedPubKeyAddress)
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if !ok {
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e := fmt.Errorf("managed address type for %v is `%T` but "+
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"want waddrmgr.ManagedPubKeyAddress", addr, ma)
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return nil, false, e
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}
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privKey, err := mpka.PrivKey()
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if err != nil {
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return nil, false, err
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}
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return privKey, ma.Compressed(), nil
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}
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func (s secretSource) GetScript(addr btcutil.Address) ([]byte, error) {
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ma, err := s.Address(s.addrmgrNs, addr)
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if err != nil {
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return nil, err
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}
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msa, ok := ma.(waddrmgr.ManagedScriptAddress)
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if !ok {
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e := fmt.Errorf("managed address type for %v is `%T` but "+
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"want waddrmgr.ManagedScriptAddress", addr, ma)
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return nil, e
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}
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return msa.Script()
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}
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// txToOutputs creates a signed transaction which includes each output from
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// outputs. Previous outputs to reedeem are chosen from the passed account's
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// UTXO set and minconf policy. An additional output may be added to return
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// change to the wallet. An appropriate fee is included based on the wallet's
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// current relay fee. The wallet must be unlocked to create the transaction.
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//
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// NOTE: The dryRun argument can be set true to create a tx that doesn't alter
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// the database. A tx created with this set to true will intentionally have no
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// input scripts added and SHOULD NOT be broadcasted.
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func (w *Wallet) txToOutputs(outputs []*wire.TxOut, account uint32,
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minconf int32, feeSatPerKb btcutil.Amount, dryRun bool) (
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tx *txauthor.AuthoredTx, err error) {
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chainClient, err := w.requireChainClient()
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if err != nil {
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return nil, err
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}
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dbtx, err := w.db.BeginReadWriteTx()
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if err != nil {
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return nil, err
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}
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defer dbtx.Rollback()
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addrmgrNs := dbtx.ReadWriteBucket(waddrmgrNamespaceKey)
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// Get current block's height and hash.
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bs, err := chainClient.BlockStamp()
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if err != nil {
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return nil, err
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}
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eligible, err := w.findEligibleOutputs(dbtx, account, minconf, bs)
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if err != nil {
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return nil, err
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}
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inputSource := makeInputSource(eligible)
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changeSource := func() ([]byte, error) {
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// Derive the change output script. We'll use the default key
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// scope responsible for P2WPKH addresses to do so. As a hack to
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// allow spending from the imported account, change addresses
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// are created from account 0.
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var changeAddr btcutil.Address
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var err error
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changeKeyScope := waddrmgr.KeyScopeBIP0084
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if account == waddrmgr.ImportedAddrAccount {
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changeAddr, err = w.newChangeAddress(
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addrmgrNs, 0, changeKeyScope,
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)
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} else {
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changeAddr, err = w.newChangeAddress(
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addrmgrNs, account, changeKeyScope,
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)
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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 txscript.PayToAddrScript(changeAddr)
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}
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tx, err = txauthor.NewUnsignedTransaction(outputs, feeSatPerKb,
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inputSource, changeSource)
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if err != nil {
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return nil, err
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}
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// Randomize change position, if change exists, before signing. This
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// doesn't affect the serialize size, so the change amount will still
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// be valid.
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if tx.ChangeIndex >= 0 {
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tx.RandomizeChangePosition()
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}
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// If a dry run was requested, we return now before adding the input
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// scripts, and don't commit the database transaction. The DB will be
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// rolled back when this method returns to ensure the dry run didn't
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// alter the DB in any way.
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if dryRun {
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return tx, nil
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}
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err = tx.AddAllInputScripts(secretSource{w.Manager, addrmgrNs})
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if err != nil {
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return nil, err
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}
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err = validateMsgTx(tx.Tx, tx.PrevScripts, tx.PrevInputValues)
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if err != nil {
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return nil, err
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}
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if err := dbtx.Commit(); err != nil {
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return nil, err
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}
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if tx.ChangeIndex >= 0 && account == waddrmgr.ImportedAddrAccount {
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changeAmount := btcutil.Amount(tx.Tx.TxOut[tx.ChangeIndex].Value)
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log.Warnf("Spend from imported account produced change: moving"+
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" %v from imported account into default account.", changeAmount)
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}
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// Finally, we'll request the backend to notify us of the transaction
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// that pays to the change address, if there is one, when it confirms.
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if tx.ChangeIndex >= 0 {
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changePkScript := tx.Tx.TxOut[tx.ChangeIndex].PkScript
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_, addrs, _, err := txscript.ExtractPkScriptAddrs(
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changePkScript, w.chainParams,
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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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if err := chainClient.NotifyReceived(addrs); err != nil {
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return nil, err
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}
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}
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return tx, nil
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}
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func (w *Wallet) findEligibleOutputs(dbtx walletdb.ReadTx, account uint32, minconf int32, bs *waddrmgr.BlockStamp) ([]wtxmgr.Credit, error) {
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addrmgrNs := dbtx.ReadBucket(waddrmgrNamespaceKey)
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txmgrNs := dbtx.ReadBucket(wtxmgrNamespaceKey)
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unspent, err := w.TxStore.UnspentOutputs(txmgrNs)
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if err != nil {
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return nil, err
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}
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// TODO: Eventually all of these filters (except perhaps output locking)
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// should be handled by the call to UnspentOutputs (or similar).
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// Because one of these filters requires matching the output script to
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// the desired account, this change depends on making wtxmgr a waddrmgr
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// dependancy and requesting unspent outputs for a single account.
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eligible := make([]wtxmgr.Credit, 0, len(unspent))
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for i := range unspent {
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output := &unspent[i]
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// Only include this output if it meets the required number of
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// confirmations. Coinbase transactions must have have reached
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// maturity before their outputs may be spent.
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if !confirmed(minconf, output.Height, bs.Height) {
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continue
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}
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if output.FromCoinBase {
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target := int32(w.chainParams.CoinbaseMaturity)
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if !confirmed(target, output.Height, bs.Height) {
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continue
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}
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}
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// Locked unspent outputs are skipped.
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if w.LockedOutpoint(output.OutPoint) {
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continue
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}
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// Only include the output if it is associated with the passed
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// account.
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//
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// TODO: Handle multisig outputs by determining if enough of the
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// addresses are controlled.
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_, addrs, _, err := txscript.ExtractPkScriptAddrs(
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output.PkScript, w.chainParams)
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if err != nil || len(addrs) != 1 {
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continue
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}
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_, addrAcct, err := w.Manager.AddrAccount(addrmgrNs, addrs[0])
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if err != nil || addrAcct != account {
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continue
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}
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eligible = append(eligible, *output)
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}
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return eligible, nil
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}
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// validateMsgTx verifies transaction input scripts for tx. All previous output
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// scripts from outputs redeemed by the transaction, in the same order they are
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// spent, must be passed in the prevScripts slice.
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func validateMsgTx(tx *wire.MsgTx, prevScripts [][]byte, inputValues []btcutil.Amount) error {
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hashCache := txscript.NewTxSigHashes(tx)
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for i, prevScript := range prevScripts {
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vm, err := txscript.NewEngine(prevScript, tx, i,
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txscript.StandardVerifyFlags, nil, hashCache, int64(inputValues[i]))
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if err != nil {
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return fmt.Errorf("cannot create script engine: %s", err)
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}
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err = vm.Execute()
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if err != nil {
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return fmt.Errorf("cannot validate transaction: %s", err)
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}
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}
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return nil
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}
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