forked from decred/dcrwallet
/
loader.go
368 lines (323 loc) · 9.8 KB
/
loader.go
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// Copyright (c) 2015-2017 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package loader
import (
"fmt"
"os"
"path/filepath"
"sync"
"github.com/decred/dcrd/chaincfg"
"github.com/decred/dcrd/dcrutil"
dcrrpcclient "github.com/decred/dcrd/rpcclient"
"github.com/decred/dcrwallet/ticketbuyer"
"github.com/decred/dcrwallet/wallet"
"github.com/decred/dcrwallet/walletdb"
_ "github.com/decred/dcrwallet/walletdb/bdb" // driver loaded during init
)
const (
walletDbName = "wallet.db"
)
// 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)
chainClient *dcrrpcclient.Client
chainParams *chaincfg.Params
dbDirPath string
wallet *wallet.Wallet
db walletdb.DB
mu sync.Mutex
purchaseManager *ticketbuyer.PurchaseManager
ntfnClient wallet.MainTipChangedNotificationsClient
stakeOptions *StakeOptions
addrIdxScanLen int
allowHighFees bool
relayFee float64
}
// StakeOptions contains the various options necessary for stake mining.
type StakeOptions struct {
VotingEnabled bool
TicketFee float64
AddressReuse bool
VotingAddress dcrutil.Address
PoolAddress dcrutil.Address
PoolFees float64
StakePoolColdExtKey string
}
// NewLoader constructs a Loader.
func NewLoader(chainParams *chaincfg.Params, dbDirPath string, stakeOptions *StakeOptions, addrIdxScanLen int,
allowHighFees bool, relayFee float64) *Loader {
return &Loader{
chainParams: chainParams,
dbDirPath: dbDirPath,
stakeOptions: stakeOptions,
addrIdxScanLen: addrIdxScanLen,
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 walletdb.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()
}
}
// 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(pubPassphrase, privPassphrase, seed []byte) (w *wallet.Wallet, err error) {
defer l.mu.Unlock()
l.mu.Lock()
if l.wallet != nil {
return nil, ErrWalletLoaded
}
// 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, fmt.Errorf("cannot create directory: %s", err)
}
} else {
return nil, fmt.Errorf("error checking directory: %s", err)
}
} else {
if !fi.IsDir() {
return nil, fmt.Errorf("path '%s' is not a directory", l.dbDirPath)
}
}
dbPath := filepath.Join(l.dbDirPath, walletDbName)
exists, err := fileExists(dbPath)
if err != nil {
return nil, err
}
if exists {
return nil, ErrWalletExists
}
// 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 bolt db.
err = os.MkdirAll(l.dbDirPath, 0700)
if err != nil {
return nil, err
}
db, err := walletdb.Create("bdb", dbPath)
if err != nil {
return nil, err
}
// Initialize the newly created database for the wallet before opening.
err = wallet.Create(db, pubPassphrase, privPassphrase, seed, l.chainParams)
if err != nil {
return nil, err
}
// Open the newly-created wallet.
so := l.stakeOptions
cfg := &wallet.Config{
DB: db,
PubPassphrase: pubPassphrase,
VotingEnabled: so.VotingEnabled,
AddressReuse: so.AddressReuse,
VotingAddress: so.VotingAddress,
PoolAddress: so.PoolAddress,
PoolFees: so.PoolFees,
TicketFee: so.TicketFee,
GapLimit: l.addrIdxScanLen,
StakePoolColdExtKey: so.StakePoolColdExtKey,
AllowHighFees: l.allowHighFees,
RelayFee: l.relayFee,
Params: l.chainParams,
}
w, err = wallet.Open(cfg)
if err != nil {
return nil, err
}
w.Start()
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(pubPassphrase []byte) (w *wallet.Wallet, rerr error) {
defer l.mu.Unlock()
l.mu.Lock()
if l.wallet != nil {
return nil, ErrWalletLoaded
}
// Open the database using the boltdb backend.
dbPath := filepath.Join(l.dbDirPath, walletDbName)
db, err := walletdb.Open("bdb", dbPath)
if err != nil {
log.Errorf("Failed to open database: %v", err)
return nil, 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()
}
}()
so := l.stakeOptions
cfg := &wallet.Config{
DB: db,
PubPassphrase: pubPassphrase,
VotingEnabled: so.VotingEnabled,
AddressReuse: so.AddressReuse,
VotingAddress: so.VotingAddress,
PoolAddress: so.PoolAddress,
PoolFees: so.PoolFees,
TicketFee: so.TicketFee,
GapLimit: l.addrIdxScanLen,
StakePoolColdExtKey: so.StakePoolColdExtKey,
AllowHighFees: l.allowHighFees,
RelayFee: l.relayFee,
Params: l.chainParams,
}
w, err = wallet.Open(cfg)
if err != nil {
return nil, err
}
w.Start()
l.onLoaded(w, db)
return w, nil
}
// 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) {
dbPath := filepath.Join(l.dbDirPath, walletDbName)
return fileExists(dbPath)
}
// 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. This returns ErrWalletNotLoaded 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 {
defer l.mu.Unlock()
l.mu.Lock()
if l.wallet == nil {
return ErrWalletNotLoaded
}
// Ignore err already stopped.
l.stopTicketPurchase()
l.wallet.Stop()
l.wallet.WaitForShutdown()
err := l.db.Close()
if err != nil {
return err
}
l.wallet = nil
l.db = nil
return nil
}
// SetChainClient sets the chain server client.
func (l *Loader) SetChainClient(chainClient *dcrrpcclient.Client) {
l.mu.Lock()
l.chainClient = chainClient
l.mu.Unlock()
}
// StartTicketPurchase launches the ticketbuyer to start purchasing tickets.
func (l *Loader) StartTicketPurchase(passphrase []byte, ticketbuyerCfg *ticketbuyer.Config) error {
defer l.mu.Unlock()
l.mu.Lock()
// Already running?
if l.purchaseManager != nil {
return ErrTicketBuyerStarted
}
if l.wallet == nil {
return ErrWalletNotLoaded
}
if l.chainClient == nil {
return ErrNoChainClient
}
w := l.wallet
p, err := ticketbuyer.NewTicketPurchaser(ticketbuyerCfg, l.chainClient, w, l.chainParams)
if err != nil {
return err
}
n := w.NtfnServer.MainTipChangedNotifications()
pm := ticketbuyer.NewPurchaseManager(w, p, n.C, passphrase)
l.ntfnClient = n
l.purchaseManager = pm
pm.Start()
return nil
}
// stopTicketPurchase stops the ticket purchaser, waiting until it has finished.
// It must be called with the mutex lock held.
func (l *Loader) stopTicketPurchase() error {
if l.purchaseManager == nil {
return ErrTicketBuyerStopped
}
l.ntfnClient.Done()
l.purchaseManager.Stop()
l.purchaseManager.WaitForShutdown()
l.purchaseManager = nil
return nil
}
// StopTicketPurchase stops the ticket purchaser, waiting until it has finished.
// If no ticket purchaser is running, it returns ErrTicketBuyerStopped.
func (l *Loader) StopTicketPurchase() error {
defer l.mu.Unlock()
l.mu.Lock()
return l.stopTicketPurchase()
}
// PurchaseManager returns the ticket purchaser instance. If ticket purchasing
// has been disabled, it returns nil.
func (l *Loader) PurchaseManager() *ticketbuyer.PurchaseManager {
l.mu.Lock()
pm := l.purchaseManager
l.mu.Unlock()
return pm
}
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
}