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loader.go
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loader.go
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// Copyright (c) 2015-2018 The btcsuite developers
// Copyright (c) 2017-2019 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package loader
import (
"context"
"fmt"
"os"
"path/filepath"
"sync"
"time"
"decred.org/dcrwallet/v4/errors"
"decred.org/dcrwallet/v4/wallet"
_ "decred.org/dcrwallet/v4/wallet/drivers/bdb" // driver loaded during init
"decred.org/dcrwallet/v4/wallet/txrules"
"decred.org/dcrwallet/v4/wallet/udb"
"github.com/decred/dcrd/chaincfg/v3"
"github.com/decred/dcrd/dcrutil/v4"
"github.com/decred/dcrd/hdkeychain/v3"
"github.com/decred/dcrlnd/kvdb"
)
const (
walletDbName = "wallet.db"
driver = "bdb"
)
// LoaderOption is similar to the upstream btcwallet.LoaderOption type, but not
// yet used.
type LoaderOption func(l *Loader)
func LoaderWithExternalWalletDB(backend kvdb.Backend) LoaderOption {
panic("unimplemented")
}
func LoaderWithLocalWalletDB(dbDirPath string, noSyncFreeList bool, dbTimeout time.Duration) LoaderOption {
return func(l *Loader) {
if dbDirPath != l.dbDirPath {
panic(fmt.Sprintf("wrong usage: %s != %s", dbDirPath, l.dbDirPath))
}
}
}
// Loader implements the creating of new and opening of existing wallets, while
// providing a callback system for other subsystems to handle the loading of a
// wallet. This is primarely intended for use by the RPC servers, to enable
// methods and services which require the wallet when the wallet is loaded by
// another subsystem.
//
// Loader is safe for concurrent access.
type Loader struct {
callbacks []func(*wallet.Wallet)
chainParams *chaincfg.Params
dbDirPath string
wallet *wallet.Wallet
db wallet.DB
gapLimit uint32
accountGapLimit int
disableCoinTypeUpgrades bool
allowHighFees bool
relayFee dcrutil.Amount
mu sync.Mutex
}
// NewLoader constructs a Loader.
func NewLoader(chainParams *chaincfg.Params, dbDirPath string, gapLimit uint32) *Loader {
allowHighFees := false
relayFee := txrules.DefaultRelayFeePerKb
accountGapLimit := wallet.DefaultAccountGapLimit
disableCoinTypeUpgrades := defaultDisableCoinTypeUpgrades
return &Loader{
chainParams: chainParams,
dbDirPath: dbDirPath,
gapLimit: gapLimit,
accountGapLimit: accountGapLimit,
disableCoinTypeUpgrades: disableCoinTypeUpgrades,
allowHighFees: allowHighFees,
relayFee: relayFee,
}
}
// onLoaded executes each added callback and prevents loader from loading any
// additional wallets. Requires mutex to be locked.
func (l *Loader) onLoaded(w *wallet.Wallet, db wallet.DB) {
for _, fn := range l.callbacks {
fn(w)
}
l.wallet = w
l.db = db
l.callbacks = nil // not needed anymore
}
// RunAfterLoad adds a function to be executed when the loader creates or opens
// a wallet. Functions are executed in a single goroutine in the order they are
// added.
func (l *Loader) RunAfterLoad(fn func(*wallet.Wallet)) {
l.mu.Lock()
if l.wallet != nil {
w := l.wallet
l.mu.Unlock()
fn(w)
} else {
l.callbacks = append(l.callbacks, fn)
l.mu.Unlock()
}
}
// CreateWatchingOnlyWallet creates a new watch-only wallet using the provided
// extended public key and public passphrase.
func (l *Loader) CreateWatchingOnlyWallet(ctx context.Context, extendedPubKey string, pubPass []byte) (w *wallet.Wallet, err error) {
const op errors.Op = "loader.CreateWatchingOnlyWallet"
defer l.mu.Unlock()
l.mu.Lock()
if l.wallet != nil {
return nil, errors.E(op, errors.Exist, "wallet already loaded")
}
// Ensure that the network directory exists.
if fi, err := os.Stat(l.dbDirPath); err != nil {
if os.IsNotExist(err) {
// Attempt data directory creation
if err = os.MkdirAll(l.dbDirPath, 0700); err != nil {
return nil, errors.E(op, err)
}
} else {
return nil, errors.E(op, err)
}
} else {
if !fi.IsDir() {
return nil, errors.E(op, errors.Invalid, errors.Errorf("%q is not a directory", l.dbDirPath))
}
}
dbPath := filepath.Join(l.dbDirPath, walletDbName)
exists, err := fileExists(dbPath)
if err != nil {
return nil, errors.E(op, err)
}
if exists {
return nil, errors.E(op, errors.Exist, "wallet already exists")
}
// At this point it is asserted that there is no existing database file, and
// deleting anything won't destroy a wallet in use. Defer a function that
// attempts to remove any written database file if this function errors.
defer func() {
if err != nil {
_ = os.Remove(dbPath)
}
}()
// Create the wallet database backed by bbolt db.
err = os.MkdirAll(l.dbDirPath, 0700)
if err != nil {
return nil, errors.E(op, err)
}
db, err := wallet.CreateDB(driver, dbPath)
if err != nil {
return nil, errors.E(op, err)
}
// Initialize the watch-only database for the wallet before opening.
err = wallet.CreateWatchOnly(ctx, db, extendedPubKey, pubPass, l.chainParams)
if err != nil {
return nil, errors.E(op, err)
}
// Open the watch-only wallet.
cfg := &wallet.Config{
DB: db,
PubPassphrase: pubPass,
GapLimit: l.gapLimit,
AccountGapLimit: l.accountGapLimit,
DisableCoinTypeUpgrades: l.disableCoinTypeUpgrades,
AllowHighFees: l.allowHighFees,
RelayFee: l.relayFee,
Params: l.chainParams,
}
w, err = wallet.Open(ctx, cfg)
if err != nil {
return nil, errors.E(op, err)
}
l.onLoaded(w, db)
return w, nil
}
func (l *Loader) CreateNewWalletExtendedKey(ctx context.Context,
pubPassphrase, privPassphrase []byte,
xpriv *hdkeychain.ExtendedKey) (w *wallet.Wallet, err error) {
panic("boo")
}
// CreateNewWallet creates a new wallet using the provided public and private
// passphrases. The seed is optional. If non-nil, addresses are derived from
// this seed. If nil, a secure random seed is generated.
func (l *Loader) CreateNewWallet(ctx context.Context, pubPassphrase,
privPassphrase, seed []byte, birthday time.Time) (w *wallet.Wallet, err error) {
const op errors.Op = "loader.CreateNewWallet"
defer l.mu.Unlock()
l.mu.Lock()
if l.wallet != nil {
return nil, errors.E(op, errors.Exist, "wallet already opened")
}
// Ensure that the network directory exists.
if fi, err := os.Stat(l.dbDirPath); err != nil {
if os.IsNotExist(err) {
// Attempt data directory creation
if err = os.MkdirAll(l.dbDirPath, 0700); err != nil {
return nil, errors.E(op, err)
}
} else {
return nil, errors.E(op, err)
}
} else {
if !fi.IsDir() {
return nil, errors.E(op, errors.Errorf("%q is not a directory", l.dbDirPath))
}
}
dbPath := filepath.Join(l.dbDirPath, walletDbName)
exists, err := fileExists(dbPath)
if err != nil {
return nil, errors.E(op, err)
}
if exists {
return nil, errors.E(op, errors.Exist, "wallet DB exists")
}
// At this point it is asserted that there is no existing database file, and
// deleting anything won't destroy a wallet in use. Defer a function that
// attempts to remove any written database file if this function errors.
defer func() {
if err != nil {
_ = os.Remove(dbPath)
}
}()
// Create the wallet database backed by bbolt db.
err = os.MkdirAll(l.dbDirPath, 0700)
if err != nil {
return nil, errors.E(op, err)
}
db, err := wallet.CreateDB(driver, dbPath)
if err != nil {
return nil, errors.E(op, err)
}
// Initialize the newly created database for the wallet before opening.
err = wallet.Create(ctx, db, pubPassphrase, privPassphrase, seed, l.chainParams)
if err != nil {
return nil, errors.E(op, err)
}
// Open the newly-created wallet.
cfg := &wallet.Config{
DB: db,
PubPassphrase: pubPassphrase,
GapLimit: l.gapLimit,
AccountGapLimit: l.accountGapLimit,
DisableCoinTypeUpgrades: l.disableCoinTypeUpgrades,
AllowHighFees: l.allowHighFees,
RelayFee: l.relayFee,
Params: l.chainParams,
}
w, err = wallet.Open(ctx, cfg)
if err != nil {
return nil, errors.E(op, err)
}
bs := &udb.BirthdayState{
SetFromTime: true,
Time: birthday,
}
if err := w.SetBirthState(ctx, bs); err != nil {
return nil, errors.E(op, err)
}
l.onLoaded(w, db)
return w, nil
}
// OpenExistingWallet opens the wallet from the loader's wallet database path
// and the public passphrase. If the loader is being called by a context where
// standard input prompts may be used during wallet upgrades, setting
// canConsolePrompt will enable these prompts.
func (l *Loader) OpenExistingWallet(ctx context.Context, pubPassphrase []byte) (w *wallet.Wallet, rerr error) {
const op errors.Op = "loader.OpenExistingWallet"
defer l.mu.Unlock()
l.mu.Lock()
if l.wallet != nil {
return nil, errors.E(op, errors.Exist, "wallet already opened")
}
// Open the database using the bboltdb backend.
dbPath := filepath.Join(l.dbDirPath, walletDbName)
l.mu.Unlock()
db, err := wallet.OpenDB(driver, dbPath)
l.mu.Lock()
if err != nil {
log.Errorf("Failed to open database: %v", err)
return nil, errors.E(op, err)
}
// If this function does not return to completion the database must be
// closed. Otherwise, because the database is locked on opens, any
// other attempts to open the wallet will hang, and there is no way to
// recover since this db handle would be leaked.
defer func() {
if rerr != nil {
db.Close()
}
}()
cfg := &wallet.Config{
DB: db,
PubPassphrase: pubPassphrase,
GapLimit: l.gapLimit,
AccountGapLimit: l.accountGapLimit,
DisableCoinTypeUpgrades: l.disableCoinTypeUpgrades,
AllowHighFees: l.allowHighFees,
RelayFee: l.relayFee,
Params: l.chainParams,
}
w, err = wallet.Open(ctx, cfg)
if err != nil {
return nil, errors.E(op, err)
}
l.onLoaded(w, db)
return w, nil
}
// DbDirPath returns the Loader's database directory path
func (l *Loader) DbDirPath() string {
return l.dbDirPath
}
// WalletExists returns whether a file exists at the loader's database path.
// This may return an error for unexpected I/O failures.
func (l *Loader) WalletExists() (bool, error) {
const op errors.Op = "loader.WalletExists"
dbPath := filepath.Join(l.dbDirPath, walletDbName)
exists, err := fileExists(dbPath)
if err != nil {
return false, errors.E(op, err)
}
return exists, nil
}
// LoadedWallet returns the loaded wallet, if any, and a bool for whether the
// wallet has been loaded or not. If true, the wallet pointer should be safe to
// dereference.
func (l *Loader) LoadedWallet() (*wallet.Wallet, bool) {
l.mu.Lock()
w := l.wallet
l.mu.Unlock()
return w, w != nil
}
// UnloadWallet stops the loaded wallet, if any, and closes the wallet database.
// Returns with errors.Invalid if the wallet has not been loaded with
// CreateNewWallet or LoadExistingWallet. The Loader may be reused if this
// function returns without error.
func (l *Loader) UnloadWallet() error {
const op errors.Op = "loader.UnloadWallet"
defer l.mu.Unlock()
l.mu.Lock()
if l.wallet == nil {
return errors.E(op, errors.Invalid, "wallet is unopened")
}
err := l.db.Close()
if err != nil {
return errors.E(op, err)
}
l.wallet = nil
l.db = nil
return nil
}
// NetworkBackend returns the associated wallet network backend, if any, and a
// bool describing whether a non-nil network backend was set.
func (l *Loader) NetworkBackend() (n wallet.NetworkBackend, ok bool) {
l.mu.Lock()
if l.wallet != nil {
n, _ = l.wallet.NetworkBackend()
}
l.mu.Unlock()
return n, n != nil
}
func fileExists(filePath string) (bool, error) {
_, err := os.Stat(filePath)
if err != nil {
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
return true, nil
}