multi: add sql stores to loopd

This commit adds the ability to choose between different sql stores
for loopd. The default is sqlite, but it can be changed to postgres.

client.go

@@ -121,11 +121,9 @@ type ClientConfig struct {
 }
 
 // NewClient returns a new instance to initiate swaps with.
-func NewClient(dbDir string, cfg *ClientConfig) (*Client, func(), error) {
-	store, err := loopdb.NewBoltSwapStore(dbDir, cfg.Lnd.ChainParams)
-	if err != nil {
-		return nil, nil, err
-	}
+func NewClient(dbDir string, loopDB loopdb.SwapStore,
+	cfg *ClientConfig) (*Client, func(), error) {
+
 	lsatStore, err := lsat.NewFileStore(dbDir)
 	if err != nil {
 		return nil, nil, err
@@ -139,7 +137,7 @@ func NewClient(dbDir string, cfg *ClientConfig) (*Client, func(), error) {
 	config := &clientConfig{
 		LndServices: cfg.Lnd,
 		Server:      swapServerClient,
-		Store:       store,
+		Store:       loopDB,
 		LsatStore:   lsatStore,
 		CreateExpiryTimer: func(d time.Duration) <-chan time.Time {
 			return time.NewTimer(d).C
@@ -153,7 +151,7 @@ func NewClient(dbDir string, cfg *ClientConfig) (*Client, func(), error) {
 
 	executor := newExecutor(&executorConfig{
 		lnd:                 cfg.Lnd,
-		store:               store,
+		store:               loopDB,
 		sweeper:             sweeper,
 		createExpiryTimer:   config.CreateExpiryTimer,
 		loopOutMaxParts:     cfg.LoopOutMaxParts,
@@ -185,7 +183,7 @@ func NewClient(dbDir string, cfg *ClientConfig) (*Client, func(), error) {
 
 	cleanup := func() {
 		swapServerClient.stop()
-		store.Close()
+		loopDB.Close()
 	}
 
 	return client, cleanup, nil

loopd/config.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/btcsuite/btcd/btcutil"
 	"github.com/lightninglabs/aperture/lsat"
+	"github.com/lightninglabs/loop/loopdb"
 	"github.com/lightningnetwork/lnd/cert"
 	"github.com/lightningnetwork/lnd/lncfg"
 	"github.com/lightningnetwork/lnd/lnrpc"
@@ -28,11 +29,19 @@ var (
 	defaultLogDirname  = "logs"
 	defaultLogFilename = "loopd.log"
 
+	defaultSqliteDatabaseFileName = "loop_sqlite.db"
+
 	defaultLogDir     = filepath.Join(LoopDirBase, defaultLogDirname)
 	defaultConfigFile = filepath.Join(
 		LoopDirBase, DefaultNetwork, defaultConfigFilename,
 	)
 
+	// defaultSqliteDatabasePath is the default path under which we store
+	// the SQLite database file.
+	defaultSqliteDatabasePath = filepath.Join(
+		LoopDirBase, DefaultNetwork, defaultSqliteDatabaseFileName,
+	)
+
 	defaultMaxLogFiles         = 3
 	defaultMaxLogFileSize      = 10
 	defaultLoopOutMaxParts     = uint32(5)
@@ -47,6 +56,12 @@ var (
 	// TLS key.
 	DefaultTLSKeyFilename = "tls.key"
 
+	// DatabaseBackendSqlite is the name of the SQLite database backend.
+	DatabaseBackendSqlite = "sqlite"
+
+	// DatabaseBackendPostgres is the name of the Postgres database backend.
+	DatabaseBackendPostgres = "postgres"
+
 	defaultSelfSignedOrganization = "loop autogenerated cert"
 
 	// defaultLndMacaroon is the default macaroon file we use if the old,
@@ -127,6 +142,10 @@ type Config struct {
 	ConfigFile string `long:"configfile" description:"Path to configuration file."`
 	DataDir    string `long:"datadir" description:"Directory for loopdb."`
 
+	DatabaseBackend string                 `long:"databasebackend" description:"The database backend to use for storing all asset related data." choice:"sqlite" choice:"postgres"`
+	Sqlite          *loopdb.SqliteConfig   `group:"sqlite" namespace:"sqlite"`
+	Postgres        *loopdb.PostgresConfig `group:"postgres" namespace:"postgres"`
+
 	TLSCertPath        string   `long:"tlscertpath" description:"Path to write the TLS certificate for loop's RPC and REST services."`
 	TLSKeyPath         string   `long:"tlskeypath" description:"Path to write the TLS private key for loop's RPC and REST services."`
 	TLSExtraIPs        []string `long:"tlsextraip" description:"Adds an extra IP to the generated certificate."`
@@ -172,9 +191,13 @@ func DefaultConfig() Config {
 		Server: &loopServerConfig{
 			NoTLS: false,
 		},
-		LoopDir:             LoopDirBase,
-		ConfigFile:          defaultConfigFile,
-		DataDir:             LoopDirBase,
+		LoopDir:         LoopDirBase,
+		ConfigFile:      defaultConfigFile,
+		DataDir:         LoopDirBase,
+		DatabaseBackend: DatabaseBackendSqlite,
+		Sqlite: &loopdb.SqliteConfig{
+			DatabaseFileName: defaultSqliteDatabasePath,
+		},
 		LogDir:              defaultLogDir,
 		MaxLogFiles:         defaultMaxLogFiles,
 		MaxLogFileSize:      defaultMaxLogFileSize,
@@ -276,6 +299,14 @@ func Validate(cfg *Config) error {
 		)
 	}
 
+	// We'll also update the database file location as well, if it wasn't
+	// set.
+	if cfg.Sqlite.DatabaseFileName == defaultSqliteDatabasePath {
+		cfg.Sqlite.DatabaseFileName = filepath.Join(
+			cfg.DataDir, defaultSqliteDatabaseFileName,
+		)
+	}
+
 	// If either of these directories do not exist, create them.
 	if err := os.MkdirAll(cfg.DataDir, os.ModePerm); err != nil {
 		return err

loopd/utils.go

@@ -2,34 +2,67 @@ package loopd
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/btcsuite/btcd/btcutil"
 	"github.com/lightninglabs/lndclient"
 	"github.com/lightninglabs/loop"
 	"github.com/lightninglabs/loop/liquidity"
+	"github.com/lightninglabs/loop/loopdb"
 	"github.com/lightninglabs/loop/swap"
 	"github.com/lightningnetwork/lnd/clock"
 	"github.com/lightningnetwork/lnd/ticker"
 )
 
 // getClient returns an instance of the swap client.
-func getClient(config *Config, lnd *lndclient.LndServices) (*loop.Client,
+func getClient(cfg *Config, lnd *lndclient.LndServices) (*loop.Client,
 	func(), error) {
 
 	clientConfig := &loop.ClientConfig{
-		ServerAddress:       config.Server.Host,
-		ProxyAddress:        config.Server.Proxy,
-		SwapServerNoTLS:     config.Server.NoTLS,
-		TLSPathServer:       config.Server.TLSPath,
+		ServerAddress:       cfg.Server.Host,
+		ProxyAddress:        cfg.Server.Proxy,
+		SwapServerNoTLS:     cfg.Server.NoTLS,
+		TLSPathServer:       cfg.Server.TLSPath,
 		Lnd:                 lnd,
-		MaxLsatCost:         btcutil.Amount(config.MaxLSATCost),
-		MaxLsatFee:          btcutil.Amount(config.MaxLSATFee),
-		LoopOutMaxParts:     config.LoopOutMaxParts,
-		TotalPaymentTimeout: config.TotalPaymentTimeout,
-		MaxPaymentRetries:   config.MaxPaymentRetries,
+		MaxLsatCost:         btcutil.Amount(cfg.MaxLSATCost),
+		MaxLsatFee:          btcutil.Amount(cfg.MaxLSATFee),
+		LoopOutMaxParts:     cfg.LoopOutMaxParts,
+		TotalPaymentTimeout: cfg.TotalPaymentTimeout,
+		MaxPaymentRetries:   cfg.MaxPaymentRetries,
 	}
 
-	swapClient, cleanUp, err := loop.NewClient(config.DataDir, clientConfig)
+	// Now that we know where the database will live, we'll go ahead and
+	// open up the default implementation of it.
+	var (
+		db  loopdb.SwapStore
+		err error
+	)
+	switch cfg.DatabaseBackend {
+	case DatabaseBackendSqlite:
+		log.Infof("Opening sqlite3 database at: %v",
+			cfg.Sqlite.DatabaseFileName)
+		db, err = loopdb.NewSqliteStore(
+			cfg.Sqlite, clientConfig.Lnd.ChainParams,
+		)
+
+	case DatabaseBackendPostgres:
+		log.Infof("Opening postgres database at: %v",
+			cfg.Postgres.DSN(true))
+		db, err = loopdb.NewPostgresStore(
+			cfg.Postgres, clientConfig.Lnd.ChainParams,
+		)
+
+	default:
+		return nil, nil, fmt.Errorf("unknown database backend: %s",
+			cfg.DatabaseBackend)
+	}
+	if err != nil {
+		return nil, nil, fmt.Errorf("unable to open database: %v", err)
+	}
+
+	swapClient, cleanUp, err := loop.NewClient(
+		cfg.DataDir, db, clientConfig,
+	)
 	if err != nil {
 		return nil, nil, err
 	}