// ExportWatchingWallet returns a watching-only version of the wallet serialized
// database as a base64-encoded string.
func (w *Wallet) ExportWatchingWallet(pubPass string) (string, error) {
tmpDir, err := ioutil.TempDir("", "btcwallet")
if err != nil {
return "", err
}
defer os.RemoveAll(tmpDir)
// Create a new file and write a copy of the current database into it.
woDbPath := filepath.Join(tmpDir, walletDbWatchingOnlyName)
fi, err := os.OpenFile(woDbPath, os.O_CREATE|os.O_RDWR, 0600)
if err != nil {
return "", err
}
if err := w.db.Copy(fi); err != nil {
fi.Close()
return "", err
}
fi.Close()
defer os.Remove(woDbPath)
// Open the new database, get the address manager namespace, and open
// it.
woDb, err := walletdb.Open("bdb", woDbPath)
if err != nil {
_ = os.Remove(woDbPath)
return "", err
}
defer woDb.Close()
namespace, err := woDb.Namespace(waddrmgrNamespaceKey)
if err != nil {
return "", err
}
woMgr, err := waddrmgr.Open(namespace, []byte(pubPass),
w.chainParams, nil)
if err != nil {
return "", err
}
defer woMgr.Close()
// Convert the namespace to watching only if needed.
if err := woMgr.ConvertToWatchingOnly(); err != nil {
// Only return the error is it's not because it's already
// watching-only. When it is already watching-only, the code
// just falls through to the export below.
if !waddrmgr.IsError(err, waddrmgr.ErrWatchingOnly) {
return "", err
}
}
// Export the watching only wallet's serialized data.
woWallet := *w
woWallet.db = woDb
woWallet.Manager = woMgr
return woWallet.exportBase64()
}
// TestIsError tests the IsError func.
func TestIsError(t *testing.T) {
tests := []struct {
err error
code waddrmgr.ErrorCode
exp bool
}{
{
err: waddrmgr.ManagerError{
ErrorCode: waddrmgr.ErrDatabase,
},
code: waddrmgr.ErrDatabase,
exp: true,
},
{
// package should never return *ManagerError
err: &waddrmgr.ManagerError{
ErrorCode: waddrmgr.ErrDatabase,
},
code: waddrmgr.ErrDatabase,
exp: false,
},
{
err: waddrmgr.ManagerError{
ErrorCode: waddrmgr.ErrCrypto,
},
code: waddrmgr.ErrDatabase,
exp: false,
},
{
err: errors.New("not a ManagerError"),
code: waddrmgr.ErrDatabase,
exp: false,
},
}
for i, test := range tests {
got := waddrmgr.IsError(test.err, test.code)
if got != test.exp {
t.Errorf("Test %d: got %v expected %v", i, got, test.exp)
}
}
}
// CurrentAddress gets the most recently requested Bitcoin payment address
// from a wallet. If the address has already been used (there is at least
// one transaction spending to it in the blockchain or btcd mempool), the next
// chained address is returned.
func (w *Wallet) CurrentAddress(account uint32) (coinutil.Address, error) {
addr, err := w.Manager.LastExternalAddress(account)
if err != nil {
// If no address exists yet, create the first external address
if waddrmgr.IsError(err, waddrmgr.ErrAddressNotFound) {
return w.NewAddress(account)
}
return nil, err
}
// Get next chained address if the last one has already been used.
used, err := addr.Used()
if err != nil {
return nil, err
}
if used {
return w.NewAddress(account)
}
return addr.Address(), nil
}
// ListUnspent returns a slice of objects representing the unspent wallet
// transactions fitting the given criteria. The confirmations will be more than
// minconf, less than maxconf and if addresses is populated only the addresses
// contained within it will be considered. If we know nothing about a
// transaction an empty array will be returned.
func (w *Wallet) ListUnspent(minconf, maxconf int32,
addresses map[string]struct{}) ([]*btcjson.ListUnspentResult, error) {
syncBlock := w.Manager.SyncedTo()
filter := len(addresses) != 0
unspent, err := w.TxStore.UnspentOutputs()
if err != nil {
return nil, err
}
sort.Sort(sort.Reverse(creditSlice(unspent)))
defaultAccountName, err := w.Manager.AccountName(waddrmgr.DefaultAccountNum)
if err != nil {
return nil, err
}
results := make([]*btcjson.ListUnspentResult, 0, len(unspent))
for i := range unspent {
output := &unspent[i]
// Outputs with fewer confirmations than the minimum or more
// confs than the maximum are excluded.
confs := confirms(output.Height, syncBlock.Height)
if confs < minconf || confs > maxconf {
continue
}
// Only mature coinbase outputs are included.
if output.FromCoinBase {
const target = blockchain.CoinbaseMaturity
if !confirmed(target, output.Height, syncBlock.Height) {
continue
}
}
// Exclude locked outputs from the result set.
if w.LockedOutpoint(output.OutPoint) {
continue
}
// Lookup the associated account for the output. Use the
// default account name in case there is no associated account
// for some reason, although this should never happen.
//
// This will be unnecessary once transactions and outputs are
// grouped under the associated account in the db.
acctName := defaultAccountName
sc, addrs, _, err := txscript.ExtractPkScriptAddrs(
output.PkScript, w.chainParams)
if err != nil {
continue
}
if len(addrs) > 0 {
acct, err := w.Manager.AddrAccount(addrs[0])
if err == nil {
s, err := w.Manager.AccountName(acct)
if err == nil {
acctName = s
}
}
}
if filter {
for _, addr := range addrs {
_, ok := addresses[addr.EncodeAddress()]
if ok {
goto include
}
}
continue
}
include:
// At the moment watch-only addresses are not supported, so all
// recorded outputs that are not multisig are "spendable".
// Multisig outputs are only "spendable" if all keys are
// controlled by this wallet.
//
// TODO: Each case will need updates when watch-only addrs
// is added. For P2PK, P2PKH, and P2SH, the address must be
// looked up and not be watching-only. For multisig, all
// pubkeys must belong to the manager with the associated
// private key (currently it only checks whether the pubkey
// exists, since the private key is required at the moment).
var spendable bool
scSwitch:
switch sc {
case txscript.PubKeyHashTy:
spendable = true
case txscript.PubKeyTy:
spendable = true
case txscript.ScriptHashTy:
spendable = true
case txscript.MultiSigTy:
for _, a := range addrs {
_, err := w.Manager.Address(a)
if err == nil {
continue
}
if waddrmgr.IsError(err, waddrmgr.ErrAddressNotFound) {
break scSwitch
}
return nil, err
}
spendable = true
}
result := &btcjson.ListUnspentResult{
TxID: output.OutPoint.Hash.String(),
Vout: output.OutPoint.Index,
Account: acctName,
ScriptPubKey: hex.EncodeToString(output.PkScript),
Amount: output.Amount.ToBTC(),
Confirmations: int64(confs),
Spendable: spendable,
}
// BUG: this should be a JSON array so that all
// addresses can be included, or removed (and the
// caller extracts addresses from the pkScript).
if len(addrs) > 0 {
result.Address = addrs[0].EncodeAddress()
}
results = append(results, result)
}
return results, nil
}
func (w *Wallet) addRelevantTx(rec *wtxmgr.TxRecord, block *wtxmgr.BlockMeta) error {
// TODO: The transaction store and address manager need to be updated
// together, but each operate under different namespaces and are changed
// under new transactions. This is not error safe as we lose
// transaction semantics.
//
// I'm unsure of the best way to solve this. Some possible solutions
// and drawbacks:
//
// 1. Open write transactions here and pass the handle to every
// waddrmr and wtxmgr method. This complicates the caller code
// everywhere, however.
//
// 2. Move the wtxmgr namespace into the waddrmgr namespace, likely
// under its own bucket. This entire function can then be moved
// into the waddrmgr package, which updates the nested wtxmgr.
// This removes some of separation between the components.
//
// 3. Use multiple wtxmgrs, one for each account, nested in the
// waddrmgr namespace. This still provides some sort of logical
// separation (transaction handling remains in another package, and
// is simply used by waddrmgr), but may result in duplicate
// transactions being saved if they are relevant to multiple
// accounts.
//
// 4. Store wtxmgr-related details under the waddrmgr namespace, but
// solve the drawback of #3 by splitting wtxmgr to save entire
// transaction records globally for all accounts, with
// credit/debit/balance tracking per account. Each account would
// also save the relevant transaction hashes and block incidence so
// the full transaction can be loaded from the waddrmgr
// transactions bucket. This currently seems like the best
// solution.
// At the moment all notified transactions are assumed to actually be
// relevant. This assumption will not hold true when SPV support is
// added, but until then, simply insert the transaction because there
// should either be one or more relevant inputs or outputs.
err := w.TxStore.InsertTx(rec, block)
if err != nil {
return err
}
// Check every output to determine whether it is controlled by a wallet
// key. If so, mark the output as a credit.
for i, output := range rec.MsgTx.TxOut {
_, addrs, _, err := txscript.ExtractPkScriptAddrs(output.PkScript,
w.chainParams)
if err != nil {
// Non-standard outputs are skipped.
continue
}
for _, addr := range addrs {
ma, err := w.Manager.Address(addr)
if err == nil {
// TODO: Credits should be added with the
// account they belong to, so wtxmgr is able to
// track per-account balances.
err = w.TxStore.AddCredit(rec, block, uint32(i),
ma.Internal())
if err != nil {
return err
}
err = w.Manager.MarkUsed(addr)
if err != nil {
return err
}
log.Debugf("Marked address %v used", addr)
continue
}
// Missing addresses are skipped. Other errors should
// be propagated.
if !waddrmgr.IsError(err, waddrmgr.ErrAddressNotFound) {
return err
}
}
}
// TODO: Notify connected clients of the added transaction.
bs, err := w.chainSvr.BlockStamp()
if err == nil {
w.notifyBalances(bs.Height)
}
return nil
}
