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config_builder.go
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config_builder.go
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package lnd
import (
"bytes"
"context"
"fmt"
"io/ioutil"
"net"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
"sync/atomic"
"time"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btclog"
"github.com/btcsuite/btcwallet/waddrmgr"
"github.com/btcsuite/btcwallet/wallet"
"github.com/btcsuite/btcwallet/walletdb"
proxy "github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"github.com/lightninglabs/neutrino"
"github.com/lightninglabs/neutrino/blockntfns"
"github.com/lightninglabs/neutrino/headerfs"
"github.com/lightninglabs/neutrino/pushtx"
"github.com/lightningnetwork/lnd/blockcache"
"github.com/lightningnetwork/lnd/chainntnfs"
"github.com/lightningnetwork/lnd/chainreg"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/invoices"
"github.com/lightningnetwork/lnd/keychain"
"github.com/lightningnetwork/lnd/kvdb"
"github.com/lightningnetwork/lnd/lncfg"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/lnwallet"
"github.com/lightningnetwork/lnd/lnwallet/btcwallet"
"github.com/lightningnetwork/lnd/lnwallet/rpcwallet"
"github.com/lightningnetwork/lnd/macaroons"
"github.com/lightningnetwork/lnd/rpcperms"
"github.com/lightningnetwork/lnd/signal"
"github.com/lightningnetwork/lnd/walletunlocker"
"github.com/lightningnetwork/lnd/watchtower"
"github.com/lightningnetwork/lnd/watchtower/wtclient"
"github.com/lightningnetwork/lnd/watchtower/wtdb"
"google.golang.org/grpc"
"gopkg.in/macaroon-bakery.v2/bakery"
)
// GrpcRegistrar is an interface that must be satisfied by an external subserver
// that wants to be able to register its own gRPC server onto lnd's main
// grpc.Server instance.
type GrpcRegistrar interface {
// RegisterGrpcSubserver is called for each net.Listener on which lnd
// creates a grpc.Server instance. External subservers implementing this
// method can then register their own gRPC server structs to the main
// server instance.
RegisterGrpcSubserver(*grpc.Server) error
}
// RestRegistrar is an interface that must be satisfied by an external subserver
// that wants to be able to register its own REST mux onto lnd's main
// proxy.ServeMux instance.
type RestRegistrar interface {
// RegisterRestSubserver is called after lnd creates the main
// proxy.ServeMux instance. External subservers implementing this method
// can then register their own REST proxy stubs to the main server
// instance.
RegisterRestSubserver(context.Context, *proxy.ServeMux, string,
[]grpc.DialOption) error
}
// ExternalValidator is an interface that must be satisfied by an external
// macaroon validator.
type ExternalValidator interface {
macaroons.MacaroonValidator
// Permissions returns the permissions that the external validator is
// validating. It is a map between the full HTTP URI of each RPC and its
// required macaroon permissions. If multiple action/entity tuples are
// specified per URI, they are all required. See rpcserver.go for a list
// of valid action and entity values.
Permissions() map[string][]bakery.Op
}
// DatabaseBuilder is an interface that must be satisfied by the implementation
// that provides lnd's main database backend instances.
type DatabaseBuilder interface {
// BuildDatabase extracts the current databases that we'll use for
// normal operation in the daemon. A function closure that closes all
// opened databases is also returned.
BuildDatabase(ctx context.Context) (*DatabaseInstances, func(), error)
}
// WalletConfigBuilder is an interface that must be satisfied by a custom wallet
// implementation.
type WalletConfigBuilder interface {
// BuildWalletConfig is responsible for creating or unlocking and then
// fully initializing a wallet.
BuildWalletConfig(context.Context, *DatabaseInstances,
*rpcperms.InterceptorChain,
[]*ListenerWithSignal) (*chainreg.PartialChainControl,
*btcwallet.Config, func(), error)
}
// ChainControlBuilder is an interface that must be satisfied by a custom wallet
// implementation.
type ChainControlBuilder interface {
// BuildChainControl is responsible for creating a fully populated chain
// control instance from a wallet.
BuildChainControl(*chainreg.PartialChainControl,
*btcwallet.Config) (*chainreg.ChainControl, func(), error)
}
// ImplementationCfg is a struct that holds all configuration items for
// components that can be implemented outside lnd itself.
type ImplementationCfg struct {
// GrpcRegistrar is a type that can register additional gRPC subservers
// before the main gRPC server is started.
GrpcRegistrar
// RestRegistrar is a type that can register additional REST subservers
// before the main REST proxy is started.
RestRegistrar
// ExternalValidator is a type that can provide external macaroon
// validation.
ExternalValidator
// DatabaseBuilder is a type that can provide lnd's main database
// backend instances.
DatabaseBuilder
// WalletConfigBuilder is a type that can provide a wallet configuration
// with a fully loaded and unlocked wallet.
WalletConfigBuilder
// ChainControlBuilder is a type that can provide a custom wallet
// implementation.
ChainControlBuilder
}
// DefaultWalletImpl is the default implementation of our normal, btcwallet
// backed configuration.
type DefaultWalletImpl struct {
cfg *Config
logger btclog.Logger
interceptor signal.Interceptor
watchOnly bool
migrateWatchOnly bool
pwService *walletunlocker.UnlockerService
}
// NewDefaultWalletImpl creates a new default wallet implementation.
func NewDefaultWalletImpl(cfg *Config, logger btclog.Logger,
interceptor signal.Interceptor, watchOnly bool) *DefaultWalletImpl {
return &DefaultWalletImpl{
cfg: cfg,
logger: logger,
interceptor: interceptor,
watchOnly: watchOnly,
pwService: createWalletUnlockerService(cfg),
}
}
// RegisterRestSubserver is called after lnd creates the main proxy.ServeMux
// instance. External subservers implementing this method can then register
// their own REST proxy stubs to the main server instance.
//
// NOTE: This is part of the GrpcRegistrar interface.
func (d *DefaultWalletImpl) RegisterRestSubserver(ctx context.Context,
mux *proxy.ServeMux, restProxyDest string,
restDialOpts []grpc.DialOption) error {
return lnrpc.RegisterWalletUnlockerHandlerFromEndpoint(
ctx, mux, restProxyDest, restDialOpts,
)
}
// RegisterGrpcSubserver is called for each net.Listener on which lnd creates a
// grpc.Server instance. External subservers implementing this method can then
// register their own gRPC server structs to the main server instance.
//
// NOTE: This is part of the GrpcRegistrar interface.
func (d *DefaultWalletImpl) RegisterGrpcSubserver(s *grpc.Server) error {
lnrpc.RegisterWalletUnlockerServer(s, d.pwService)
return nil
}
// ValidateMacaroon extracts the macaroon from the context's gRPC metadata,
// checks its signature, makes sure all specified permissions for the called
// method are contained within and finally ensures all caveat conditions are
// met. A non-nil error is returned if any of the checks fail.
//
// NOTE: This is part of the ExternalValidator interface.
func (d *DefaultWalletImpl) ValidateMacaroon(ctx context.Context,
requiredPermissions []bakery.Op, fullMethod string) error {
// Because the default implementation does not return any permissions,
// we shouldn't be registered as an external validator at all and this
// should never be invoked.
return fmt.Errorf("default implementation does not support external " +
"macaroon validation")
}
// Permissions returns the permissions that the external validator is
// validating. It is a map between the full HTTP URI of each RPC and its
// required macaroon permissions. If multiple action/entity tuples are specified
// per URI, they are all required. See rpcserver.go for a list of valid action
// and entity values.
//
// NOTE: This is part of the ExternalValidator interface.
func (d *DefaultWalletImpl) Permissions() map[string][]bakery.Op {
return nil
}
// BuildWalletConfig is responsible for creating or unlocking and then
// fully initializing a wallet.
//
// NOTE: This is part of the WalletConfigBuilder interface.
func (d *DefaultWalletImpl) BuildWalletConfig(ctx context.Context,
dbs *DatabaseInstances, interceptorChain *rpcperms.InterceptorChain,
grpcListeners []*ListenerWithSignal) (*chainreg.PartialChainControl,
*btcwallet.Config, func(), error) {
// Keep track of our various cleanup functions. We use a defer function
// as well to not repeat ourselves with every return statement.
var (
cleanUpTasks []func()
earlyExit = true
cleanUp = func() {
for _, fn := range cleanUpTasks {
if fn == nil {
continue
}
fn()
}
}
)
defer func() {
if earlyExit {
cleanUp()
}
}()
// Initialize a new block cache.
blockCache := blockcache.NewBlockCache(d.cfg.BlockCacheSize)
// Before starting the wallet, we'll create and start our Neutrino
// light client instance, if enabled, in order to allow it to sync
// while the rest of the daemon continues startup.
mainChain := d.cfg.Bitcoin
if d.cfg.registeredChains.PrimaryChain() == chainreg.LitecoinChain {
mainChain = d.cfg.Litecoin
}
var neutrinoCS *neutrino.ChainService
if mainChain.Node == "neutrino" {
neutrinoBackend, neutrinoCleanUp, err := initNeutrinoBackend(
ctx, d.cfg, mainChain.ChainDir, blockCache,
)
if err != nil {
err := fmt.Errorf("unable to initialize neutrino "+
"backend: %v", err)
d.logger.Error(err)
return nil, nil, nil, err
}
cleanUpTasks = append(cleanUpTasks, neutrinoCleanUp)
neutrinoCS = neutrinoBackend
}
var (
walletInitParams = walletunlocker.WalletUnlockParams{
// In case we do auto-unlock, we need to be able to send
// into the channel without blocking so we buffer it.
MacResponseChan: make(chan []byte, 1),
}
privateWalletPw = lnwallet.DefaultPrivatePassphrase
publicWalletPw = lnwallet.DefaultPublicPassphrase
)
// If the user didn't request a seed, then we'll manually assume a
// wallet birthday of now, as otherwise the seed would've specified
// this information.
walletInitParams.Birthday = time.Now()
d.pwService.SetLoaderOpts([]btcwallet.LoaderOption{dbs.WalletDB})
d.pwService.SetMacaroonDB(dbs.MacaroonDB)
walletExists, err := d.pwService.WalletExists()
if err != nil {
return nil, nil, nil, err
}
if !walletExists {
interceptorChain.SetWalletNotCreated()
} else {
interceptorChain.SetWalletLocked()
}
// If we've started in auto unlock mode, then a wallet should already
// exist because we don't want to enable the RPC unlocker in that case
// for security reasons (an attacker could inject their seed since the
// RPC is unauthenticated). Only if the user explicitly wants to allow
// wallet creation we don't error out here.
if d.cfg.WalletUnlockPasswordFile != "" && !walletExists &&
!d.cfg.WalletUnlockAllowCreate {
return nil, nil, nil, fmt.Errorf("wallet unlock password file " +
"was specified but wallet does not exist; initialize " +
"the wallet before using auto unlocking")
}
// What wallet mode are we running in? We've already made sure the no
// seed backup and auto unlock aren't both set during config parsing.
switch {
// No seed backup means we're also using the default password.
case d.cfg.NoSeedBackup:
// We continue normally, the default password has already been
// set above.
// A password for unlocking is provided in a file.
case d.cfg.WalletUnlockPasswordFile != "" && walletExists:
d.logger.Infof("Attempting automatic wallet unlock with " +
"password provided in file")
pwBytes, err := ioutil.ReadFile(d.cfg.WalletUnlockPasswordFile)
if err != nil {
return nil, nil, nil, fmt.Errorf("error reading "+
"password from file %s: %v",
d.cfg.WalletUnlockPasswordFile, err)
}
// Remove any newlines at the end of the file. The lndinit tool
// won't ever write a newline but maybe the file was provisioned
// by another process or user.
pwBytes = bytes.TrimRight(pwBytes, "\r\n")
// We have the password now, we can ask the unlocker service to
// do the unlock for us.
unlockedWallet, unloadWalletFn, err := d.pwService.LoadAndUnlock(
pwBytes, 0,
)
if err != nil {
return nil, nil, nil, fmt.Errorf("error unlocking "+
"wallet with password from file: %v", err)
}
cleanUpTasks = append(cleanUpTasks, func() {
if err := unloadWalletFn(); err != nil {
d.logger.Errorf("Could not unload wallet: %v",
err)
}
})
privateWalletPw = pwBytes
publicWalletPw = pwBytes
walletInitParams.Wallet = unlockedWallet
walletInitParams.UnloadWallet = unloadWalletFn
// If none of the automatic startup options are selected, we fall back
// to the default behavior of waiting for the wallet creation/unlocking
// over RPC.
default:
if err := d.interceptor.Notifier.NotifyReady(false); err != nil {
return nil, nil, nil, err
}
params, err := waitForWalletPassword(
d.cfg, d.pwService, []btcwallet.LoaderOption{dbs.WalletDB},
d.interceptor.ShutdownChannel(),
)
if err != nil {
err := fmt.Errorf("unable to set up wallet password "+
"listeners: %v", err)
d.logger.Error(err)
return nil, nil, nil, err
}
walletInitParams = *params
privateWalletPw = walletInitParams.Password
publicWalletPw = walletInitParams.Password
cleanUpTasks = append(cleanUpTasks, func() {
if err := walletInitParams.UnloadWallet(); err != nil {
d.logger.Errorf("Could not unload wallet: %v",
err)
}
})
if walletInitParams.RecoveryWindow > 0 {
d.logger.Infof("Wallet recovery mode enabled with "+
"address lookahead of %d addresses",
walletInitParams.RecoveryWindow)
}
}
var macaroonService *macaroons.Service
if !d.cfg.NoMacaroons {
// Create the macaroon authentication/authorization service.
rootKeyStore, err := macaroons.NewRootKeyStorage(dbs.MacaroonDB)
if err != nil {
return nil, nil, nil, err
}
macaroonService, err = macaroons.NewService(
rootKeyStore, "lnd", walletInitParams.StatelessInit,
macaroons.IPLockChecker,
macaroons.CustomChecker(interceptorChain),
)
if err != nil {
err := fmt.Errorf("unable to set up macaroon "+
"authentication: %v", err)
d.logger.Error(err)
return nil, nil, nil, err
}
cleanUpTasks = append(cleanUpTasks, func() {
if err := macaroonService.Close(); err != nil {
d.logger.Errorf("Could not close macaroon "+
"service: %v", err)
}
})
// Try to unlock the macaroon store with the private password.
// Ignore ErrAlreadyUnlocked since it could be unlocked by the
// wallet unlocker.
err = macaroonService.CreateUnlock(&privateWalletPw)
if err != nil && err != macaroons.ErrAlreadyUnlocked {
err := fmt.Errorf("unable to unlock macaroons: %v", err)
d.logger.Error(err)
return nil, nil, nil, err
}
// If we have a macaroon root key from the init wallet params,
// set the root key before baking any macaroons.
if len(walletInitParams.MacRootKey) > 0 {
err := macaroonService.SetRootKey(
walletInitParams.MacRootKey,
)
if err != nil {
return nil, nil, nil, err
}
}
// Send an admin macaroon to all our listeners that requested
// one by setting a non-nil macaroon channel.
adminMacBytes, err := bakeMacaroon(
ctx, macaroonService, adminPermissions(),
)
if err != nil {
return nil, nil, nil, err
}
for _, lis := range grpcListeners {
if lis.MacChan != nil {
lis.MacChan <- adminMacBytes
}
}
// In case we actually needed to unlock the wallet, we now need
// to create an instance of the admin macaroon and send it to
// the unlocker so it can forward it to the user. In no seed
// backup mode, there's nobody listening on the channel and we'd
// block here forever.
if !d.cfg.NoSeedBackup {
// The channel is buffered by one element so writing
// should not block here.
walletInitParams.MacResponseChan <- adminMacBytes
}
// If the user requested a stateless initialization, no macaroon
// files should be created.
if !walletInitParams.StatelessInit &&
!lnrpc.FileExists(d.cfg.AdminMacPath) &&
!lnrpc.FileExists(d.cfg.ReadMacPath) &&
!lnrpc.FileExists(d.cfg.InvoiceMacPath) {
// Create macaroon files for lncli to use if they don't
// exist.
err = genMacaroons(
ctx, macaroonService, d.cfg.AdminMacPath,
d.cfg.ReadMacPath, d.cfg.InvoiceMacPath,
)
if err != nil {
err := fmt.Errorf("unable to create macaroons "+
"%v", err)
d.logger.Error(err)
return nil, nil, nil, err
}
}
// As a security service to the user, if they requested
// stateless initialization and there are macaroon files on disk
// we log a warning.
if walletInitParams.StatelessInit {
msg := "Found %s macaroon on disk (%s) even though " +
"--stateless_init was requested. Unencrypted " +
"state is accessible by the host system. You " +
"should change the password and use " +
"--new_mac_root_key with --stateless_init to " +
"clean up and invalidate old macaroons."
if lnrpc.FileExists(d.cfg.AdminMacPath) {
d.logger.Warnf(msg, "admin", d.cfg.AdminMacPath)
}
if lnrpc.FileExists(d.cfg.ReadMacPath) {
d.logger.Warnf(msg, "readonly", d.cfg.ReadMacPath)
}
if lnrpc.FileExists(d.cfg.InvoiceMacPath) {
d.logger.Warnf(msg, "invoice", d.cfg.InvoiceMacPath)
}
}
// We add the macaroon service to our RPC interceptor. This
// will start checking macaroons against permissions on every
// RPC invocation.
interceptorChain.AddMacaroonService(macaroonService)
}
// Now that the wallet password has been provided, transition the RPC
// state into Unlocked.
interceptorChain.SetWalletUnlocked()
// Since calls to the WalletUnlocker service wait for a response on the
// macaroon channel, we close it here to make sure they return in case
// we did not return the admin macaroon above. This will be the case if
// --no-macaroons is used.
close(walletInitParams.MacResponseChan)
// We'll also close all the macaroon channels since lnd is done sending
// macaroon data over it.
for _, lis := range grpcListeners {
if lis.MacChan != nil {
close(lis.MacChan)
}
}
// With the information parsed from the configuration, create valid
// instances of the pertinent interfaces required to operate the
// Lightning Network Daemon.
//
// When we create the chain control, we need storage for the height
// hints and also the wallet itself, for these two we want them to be
// replicated, so we'll pass in the remote channel DB instance.
chainControlCfg := &chainreg.Config{
Bitcoin: d.cfg.Bitcoin,
Litecoin: d.cfg.Litecoin,
PrimaryChain: d.cfg.registeredChains.PrimaryChain,
HeightHintCacheQueryDisable: d.cfg.HeightHintCacheQueryDisable,
NeutrinoMode: d.cfg.NeutrinoMode,
BitcoindMode: d.cfg.BitcoindMode,
LitecoindMode: d.cfg.LitecoindMode,
BtcdMode: d.cfg.BtcdMode,
LtcdMode: d.cfg.LtcdMode,
HeightHintDB: dbs.HeightHintDB,
ChanStateDB: dbs.ChanStateDB.ChannelStateDB(),
NeutrinoCS: neutrinoCS,
ActiveNetParams: d.cfg.ActiveNetParams,
FeeURL: d.cfg.FeeURL,
Dialer: func(addr string) (net.Conn, error) {
return d.cfg.net.Dial(
"tcp", addr, d.cfg.ConnectionTimeout,
)
},
BlockCache: blockCache,
WalletUnlockParams: &walletInitParams,
}
// Let's go ahead and create the partial chain control now that is only
// dependent on our configuration and doesn't require any wallet
// specific information.
partialChainControl, pccCleanup, err := chainreg.NewPartialChainControl(
chainControlCfg,
)
cleanUpTasks = append(cleanUpTasks, pccCleanup)
if err != nil {
err := fmt.Errorf("unable to create partial chain control: %v",
err)
d.logger.Error(err)
return nil, nil, nil, err
}
walletConfig := &btcwallet.Config{
PrivatePass: privateWalletPw,
PublicPass: publicWalletPw,
Birthday: walletInitParams.Birthday,
RecoveryWindow: walletInitParams.RecoveryWindow,
NetParams: d.cfg.ActiveNetParams.Params,
CoinType: d.cfg.ActiveNetParams.CoinType,
Wallet: walletInitParams.Wallet,
LoaderOptions: []btcwallet.LoaderOption{dbs.WalletDB},
ChainSource: partialChainControl.ChainSource,
WatchOnly: d.watchOnly,
MigrateWatchOnly: d.migrateWatchOnly,
}
// Parse coin selection strategy.
switch d.cfg.CoinSelectionStrategy {
case "largest":
walletConfig.CoinSelectionStrategy = wallet.CoinSelectionLargest
case "random":
walletConfig.CoinSelectionStrategy = wallet.CoinSelectionRandom
default:
return nil, nil, nil, fmt.Errorf("unknown coin selection "+
"strategy %v", d.cfg.CoinSelectionStrategy)
}
earlyExit = false
return partialChainControl, walletConfig, cleanUp, nil
}
// proxyBlockEpoch proxies a block epoch subsections to the underlying neutrino
// rebroadcaster client.
func proxyBlockEpoch(notifier chainntnfs.ChainNotifier,
) func() (*blockntfns.Subscription, error) {
return func() (*blockntfns.Subscription, error) {
blockEpoch, err := notifier.RegisterBlockEpochNtfn(
nil,
)
if err != nil {
return nil, err
}
sub := blockntfns.Subscription{
Notifications: make(chan blockntfns.BlockNtfn, 6),
Cancel: blockEpoch.Cancel,
}
go func() {
for blk := range blockEpoch.Epochs {
ntfn := blockntfns.NewBlockConnected(
*blk.BlockHeader,
uint32(blk.Height),
)
sub.Notifications <- ntfn
}
}()
return &sub, nil
}
}
// walletReBroadcaster is a simple wrapper around the pushtx.Broadcaster
// interface to adhere to the expanded lnwallet.Rebroadcaster interface.
type walletReBroadcaster struct {
started atomic.Bool
*pushtx.Broadcaster
}
// newWalletReBroadcaster creates a new instance of the walletReBroadcaster.
func newWalletReBroadcaster(
broadcaster *pushtx.Broadcaster) *walletReBroadcaster {
return &walletReBroadcaster{
Broadcaster: broadcaster,
}
}
// Start launches all goroutines the rebroadcaster needs to operate.
func (w *walletReBroadcaster) Start() error {
defer w.started.Store(true)
return w.Broadcaster.Start()
}
// Started returns true if the broadcaster is already active.
func (w *walletReBroadcaster) Started() bool {
return w.started.Load()
}
// BuildChainControl is responsible for creating a fully populated chain
// control instance from a wallet.
//
// NOTE: This is part of the ChainControlBuilder interface.
func (d *DefaultWalletImpl) BuildChainControl(
partialChainControl *chainreg.PartialChainControl,
walletConfig *btcwallet.Config) (*chainreg.ChainControl, func(), error) {
walletController, err := btcwallet.New(
*walletConfig, partialChainControl.Cfg.BlockCache,
)
if err != nil {
err := fmt.Errorf("unable to create wallet controller: %v", err)
d.logger.Error(err)
return nil, nil, err
}
keyRing := keychain.NewBtcWalletKeyRing(
walletController.InternalWallet(), walletConfig.CoinType,
)
// Create, and start the lnwallet, which handles the core payment
// channel logic, and exposes control via proxy state machines.
lnWalletConfig := lnwallet.Config{
Database: partialChainControl.Cfg.ChanStateDB,
Notifier: partialChainControl.ChainNotifier,
WalletController: walletController,
Signer: walletController,
FeeEstimator: partialChainControl.FeeEstimator,
SecretKeyRing: keyRing,
ChainIO: walletController,
DefaultConstraints: partialChainControl.ChannelConstraints,
NetParams: *walletConfig.NetParams,
}
// The broadcast is already always active for neutrino nodes, so we
// don't want to create a rebroadcast loop.
if partialChainControl.Cfg.NeutrinoCS == nil {
broadcastCfg := pushtx.Config{
Broadcast: func(tx *wire.MsgTx) error {
cs := partialChainControl.ChainSource
_, err := cs.SendRawTransaction(
tx, true,
)
return err
},
SubscribeBlocks: proxyBlockEpoch(
partialChainControl.ChainNotifier,
),
RebroadcastInterval: pushtx.DefaultRebroadcastInterval,
}
lnWalletConfig.Rebroadcaster = newWalletReBroadcaster(
pushtx.NewBroadcaster(&broadcastCfg),
)
}
// We've created the wallet configuration now, so we can finish
// initializing the main chain control.
activeChainControl, cleanUp, err := chainreg.NewChainControl(
lnWalletConfig, walletController, partialChainControl,
)
if err != nil {
err := fmt.Errorf("unable to create chain control: %v", err)
d.logger.Error(err)
return nil, nil, err
}
return activeChainControl, cleanUp, nil
}
// RPCSignerWalletImpl is a wallet implementation that uses a remote signer over
// an RPC interface.
type RPCSignerWalletImpl struct {
// DefaultWalletImpl is the embedded instance of the default
// implementation that the remote signer uses as its watch-only wallet
// for keeping track of addresses and UTXOs.
*DefaultWalletImpl
}
// NewRPCSignerWalletImpl creates a new instance of the remote signing wallet
// implementation.
func NewRPCSignerWalletImpl(cfg *Config, logger btclog.Logger,
interceptor signal.Interceptor,
migrateWatchOnly bool) *RPCSignerWalletImpl {
return &RPCSignerWalletImpl{
DefaultWalletImpl: &DefaultWalletImpl{
cfg: cfg,
logger: logger,
interceptor: interceptor,
watchOnly: true,
migrateWatchOnly: migrateWatchOnly,
pwService: createWalletUnlockerService(cfg),
},
}
}
// BuildChainControl is responsible for creating or unlocking and then fully
// initializing a wallet and returning it as part of a fully populated chain
// control instance.
//
// NOTE: This is part of the ChainControlBuilder interface.
func (d *RPCSignerWalletImpl) BuildChainControl(
partialChainControl *chainreg.PartialChainControl,
walletConfig *btcwallet.Config) (*chainreg.ChainControl, func(), error) {
walletController, err := btcwallet.New(
*walletConfig, partialChainControl.Cfg.BlockCache,
)
if err != nil {
err := fmt.Errorf("unable to create wallet controller: %v", err)
d.logger.Error(err)
return nil, nil, err
}
baseKeyRing := keychain.NewBtcWalletKeyRing(
walletController.InternalWallet(), walletConfig.CoinType,
)
rpcKeyRing, err := rpcwallet.NewRPCKeyRing(
baseKeyRing, walletController,
d.DefaultWalletImpl.cfg.RemoteSigner, walletConfig.NetParams,
)
if err != nil {
err := fmt.Errorf("unable to create RPC remote signing wallet "+
"%v", err)
d.logger.Error(err)
return nil, nil, err
}
// Create, and start the lnwallet, which handles the core payment
// channel logic, and exposes control via proxy state machines.
lnWalletConfig := lnwallet.Config{
Database: partialChainControl.Cfg.ChanStateDB,
Notifier: partialChainControl.ChainNotifier,
WalletController: rpcKeyRing,
Signer: rpcKeyRing,
FeeEstimator: partialChainControl.FeeEstimator,
SecretKeyRing: rpcKeyRing,
ChainIO: walletController,
DefaultConstraints: partialChainControl.ChannelConstraints,
NetParams: *walletConfig.NetParams,
}
// We've created the wallet configuration now, so we can finish
// initializing the main chain control.
activeChainControl, cleanUp, err := chainreg.NewChainControl(
lnWalletConfig, rpcKeyRing, partialChainControl,
)
if err != nil {
err := fmt.Errorf("unable to create chain control: %v", err)
d.logger.Error(err)
return nil, nil, err
}
return activeChainControl, cleanUp, nil
}
// DatabaseInstances is a struct that holds all instances to the actual
// databases that are used in lnd.
type DatabaseInstances struct {
// GraphDB is the database that stores the channel graph used for path
// finding.
//
// NOTE/TODO: This currently _needs_ to be the same instance as the
// ChanStateDB below until the separation of the two databases is fully
// complete!
GraphDB *channeldb.DB
// ChanStateDB is the database that stores all of our node's channel
// state.
//
// NOTE/TODO: This currently _needs_ to be the same instance as the
// GraphDB above until the separation of the two databases is fully
// complete!
ChanStateDB *channeldb.DB
// HeightHintDB is the database that stores height hints for spends.
HeightHintDB kvdb.Backend
// InvoiceDB is the database that stores information about invoices.
InvoiceDB invoices.InvoiceDB
// MacaroonDB is the database that stores macaroon root keys.
MacaroonDB kvdb.Backend
// DecayedLogDB is the database that stores p2p related encryption
// information.
DecayedLogDB kvdb.Backend
// TowerClientDB is the database that stores the watchtower client's
// configuration.
TowerClientDB wtclient.DB
// TowerServerDB is the database that stores the watchtower server's
// configuration.
TowerServerDB watchtower.DB
// WalletDB is the configuration for loading the wallet database using
// the btcwallet's loader.
WalletDB btcwallet.LoaderOption
}
// DefaultDatabaseBuilder is a type that builds the default database backends
// for lnd, using the given configuration to decide what actual implementation
// to use.
type DefaultDatabaseBuilder struct {
cfg *Config
logger btclog.Logger
}
// NewDefaultDatabaseBuilder returns a new instance of the default database
// builder.
func NewDefaultDatabaseBuilder(cfg *Config,
logger btclog.Logger) *DefaultDatabaseBuilder {
return &DefaultDatabaseBuilder{
cfg: cfg,
logger: logger,
}
}
// BuildDatabase extracts the current databases that we'll use for normal
// operation in the daemon. A function closure that closes all opened databases
// is also returned.
func (d *DefaultDatabaseBuilder) BuildDatabase(
ctx context.Context) (*DatabaseInstances, func(), error) {
d.logger.Infof("Opening the main database, this might take a few " +
"minutes...")
cfg := d.cfg
if cfg.DB.Backend == lncfg.BoltBackend {
d.logger.Infof("Opening bbolt database, sync_freelist=%v, "+
"auto_compact=%v", !cfg.DB.Bolt.NoFreelistSync,
cfg.DB.Bolt.AutoCompact)
}
startOpenTime := time.Now()
databaseBackends, err := cfg.DB.GetBackends(
ctx, cfg.graphDatabaseDir(), cfg.networkDir, filepath.Join(
cfg.Watchtower.TowerDir,
cfg.registeredChains.PrimaryChain().String(),
lncfg.NormalizeNetwork(cfg.ActiveNetParams.Name),
), cfg.WtClient.Active, cfg.Watchtower.Active, d.logger,
)
if err != nil {
return nil, nil, fmt.Errorf("unable to obtain database "+
"backends: %v", err)
}
// With the full remote mode we made sure both the graph and channel
// state DB point to the same local or remote DB and the same namespace
// within that DB.
dbs := &DatabaseInstances{
HeightHintDB: databaseBackends.HeightHintDB,
MacaroonDB: databaseBackends.MacaroonDB,
DecayedLogDB: databaseBackends.DecayedLogDB,
WalletDB: databaseBackends.WalletDB,
}
cleanUp := func() {
// We can just close the returned close functions directly. Even
// if we decorate the channel DB with an additional struct, its
// close function still just points to the kvdb backend.
for name, closeFunc := range databaseBackends.CloseFuncs {
if err := closeFunc(); err != nil {
d.logger.Errorf("Error closing %s "+
"database: %v", name, err)
}
}
}
if databaseBackends.Remote {
d.logger.Infof("Using remote %v database! Creating "+
"graph and channel state DB instances", cfg.DB.Backend)
} else {
d.logger.Infof("Creating local graph and channel state DB " +
"instances")
}
dbOptions := []channeldb.OptionModifier{
channeldb.OptionSetRejectCacheSize(cfg.Caches.RejectCacheSize),
channeldb.OptionSetChannelCacheSize(
cfg.Caches.ChannelCacheSize,
),
channeldb.OptionSetBatchCommitInterval(
cfg.DB.BatchCommitInterval,
),
channeldb.OptionDryRunMigration(cfg.DryRunMigration),
channeldb.OptionSetUseGraphCache(!cfg.DB.NoGraphCache),
channeldb.OptionKeepFailedPaymentAttempts(
cfg.KeepFailedPaymentAttempts,
),
channeldb.OptionStoreFinalHtlcResolutions(
cfg.StoreFinalHtlcResolutions,
),
channeldb.OptionPruneRevocationLog(cfg.DB.PruneRevocation),
channeldb.OptionNoRevLogAmtData(cfg.DB.NoRevLogAmtData),
}
// We want to pre-allocate the channel graph cache according to what we
// expect for mainnet to speed up memory allocation.
if cfg.ActiveNetParams.Name == chaincfg.MainNetParams.Name {
dbOptions = append(
dbOptions, channeldb.OptionSetPreAllocCacheNumNodes(
channeldb.DefaultPreAllocCacheNumNodes,
),
)
}
// Otherwise, we'll open two instances, one for the state we only need
// locally, and the other for things we want to ensure are replicated.
dbs.GraphDB, err = channeldb.CreateWithBackend(
databaseBackends.GraphDB, dbOptions...,
)
switch {
// Give the DB a chance to dry run the migration. Since we know that
// both the channel state and graph DBs are still always behind the same
// backend, we know this would be applied to both of those DBs.
case err == channeldb.ErrDryRunMigrationOK:
d.logger.Infof("Graph DB dry run migration successful")
return nil, nil, err
case err != nil: