12343072627

Committed 15 Dec 2024 11:09PM UTC coverage: 57.504% (-1.1%) from 58.636%

Build # 12343072627

Build Type

Pull #9315

github

Committed by

yyforyongyu

Commit Message

contractcourt: offer outgoing htlc one block earlier before its expiry

We need to offer the outgoing htlc one block earlier to make sure when
the expiry height hits, the sweeper will not miss sweeping it in the
same block. This also means the outgoing contest resolver now only does
one thing - watch for preimage spend till height expiry-1, which can
easily be moved into the timeout resolver instead in the future.

Pull Request Pull Request #9315: Implement `blockbeat`

Run Details

1445 of 2007 new or added lines in 26 files covered. (72.0%)

19246 existing lines in 249 files now uncovered.

102342 of 177975 relevant lines covered (57.5%)

24772.24 hits per line

Source File
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4.44

/lncfg/db.go

package lncfg

import (
        "context"
        "fmt"
        "path"
        "path/filepath"
        "time"

        "github.com/btcsuite/btclog/v2"
        "github.com/lightningnetwork/lnd/kvdb"
        "github.com/lightningnetwork/lnd/kvdb/etcd"
        "github.com/lightningnetwork/lnd/kvdb/postgres"
        "github.com/lightningnetwork/lnd/kvdb/sqlbase"
        "github.com/lightningnetwork/lnd/kvdb/sqlite"
        "github.com/lightningnetwork/lnd/lnrpc"
        "github.com/lightningnetwork/lnd/lnwallet/btcwallet"
        "github.com/lightningnetwork/lnd/sqldb"
)

const (
        ChannelDBName     = "channel.db"
        MacaroonDBName    = "macaroons.db"
        DecayedLogDbName  = "sphinxreplay.db"
        TowerClientDBName = "wtclient.db"
        TowerServerDBName = "watchtower.db"
        WalletDBName      = "wallet.db"

        SqliteChannelDBName  = "channel.sqlite"
        SqliteChainDBName    = "chain.sqlite"
        SqliteNeutrinoDBName = "neutrino.sqlite"
        SqliteTowerDBName    = "watchtower.sqlite"
        SqliteNativeDBName   = "lnd.sqlite"

        BoltBackend                = "bolt"
        EtcdBackend                = "etcd"
        PostgresBackend            = "postgres"
        SqliteBackend              = "sqlite"
        DefaultBatchCommitInterval = 500 * time.Millisecond

        defaultPostgresMaxConnections = 50
        defaultSqliteMaxConnections   = 2

        defaultSqliteBusyTimeout = 5 * time.Second

        // NSChannelDB is the namespace name that we use for the combined graph
        // and channel state DB.
        NSChannelDB = "channeldb"

        // NSMacaroonDB is the namespace name that we use for the macaroon DB.
        NSMacaroonDB = "macaroondb"

        // NSDecayedLogDB is the namespace name that we use for the sphinx
        // replay a.k.a. decayed log DB.
        NSDecayedLogDB = "decayedlogdb"

        // NSTowerClientDB is the namespace name that we use for the watchtower
        // client DB.
        NSTowerClientDB = "towerclientdb"

        // NSTowerServerDB is the namespace name that we use for the watchtower
        // server DB.
        NSTowerServerDB = "towerserverdb"

        // NSWalletDB is the namespace name that we use for the wallet DB.
        NSWalletDB = "walletdb"

        // NSNeutrinoDB is the namespace name that we use for the neutrino DB.
        NSNeutrinoDB = "neutrinodb"
)

// DB holds database configuration for LND.
//
//nolint:ll
type DB struct {
        Backend string `long:"backend" description:"The selected database backend."`

        BatchCommitInterval time.Duration `long:"batch-commit-interval" description:"The maximum duration the channel graph batch schedulers will wait before attempting to commit a batch of pending updates. This can be tradeoff database contenion for commit latency."`

        Etcd *etcd.Config `group:"etcd" namespace:"etcd" description:"Etcd settings."`

        Bolt *kvdb.BoltConfig `group:"bolt" namespace:"bolt" description:"Bolt settings."`

        Postgres *sqldb.PostgresConfig `group:"postgres" namespace:"postgres" description:"Postgres settings."`

        Sqlite *sqldb.SqliteConfig `group:"sqlite" namespace:"sqlite" description:"Sqlite settings."`

        UseNativeSQL bool `long:"use-native-sql" description:"Use native SQL for tables that already support it."`

        NoGraphCache bool `long:"no-graph-cache" description:"Don't use the in-memory graph cache for path finding. Much slower but uses less RAM. Can only be used with a bolt database backend."`

        PruneRevocation bool `long:"prune-revocation" description:"Run the optional migration that prunes the revocation logs to save disk space."`

        NoRevLogAmtData bool `long:"no-rev-log-amt-data" description:"If set, the to-local and to-remote output amounts of revoked commitment transactions will not be stored in the revocation log. Note that once this data is lost, a watchtower client will not be able to back up the revoked state."`
}

// DefaultDB creates and returns a new default DB config.
func DefaultDB() *DB {
        return &DB{
                Backend:             BoltBackend,
                BatchCommitInterval: DefaultBatchCommitInterval,
                Bolt: &kvdb.BoltConfig{
                        NoFreelistSync:    true,
                        AutoCompactMinAge: kvdb.DefaultBoltAutoCompactMinAge,
                        DBTimeout:         kvdb.DefaultDBTimeout,
                },
                Etcd: &etcd.Config{
                        // Allow at most 32 MiB messages by default.
                        MaxMsgSize: 32768 * 1024,
                },
                Postgres: &sqldb.PostgresConfig{
                        MaxConnections: defaultPostgresMaxConnections,
                },
                Sqlite: &sqldb.SqliteConfig{
                        MaxConnections: defaultSqliteMaxConnections,
                        BusyTimeout:    defaultSqliteBusyTimeout,
                },
                UseNativeSQL: false,
        }
}

// Validate validates the DB config.
func (db *DB) Validate() error {
        switch db.Backend {
        case BoltBackend:
                if db.UseNativeSQL {
                        return fmt.Errorf("cannot use native SQL with bolt " +
                                "backend")
                }

        case SqliteBackend:
        case PostgresBackend:
                if err := db.Postgres.Validate(); err != nil {
                        return err
                }

        case EtcdBackend:
                if db.UseNativeSQL {
                        return fmt.Errorf("cannot use native SQL with etcd " +
                                "backend")
                }

                if !db.Etcd.Embedded && db.Etcd.Host == "" {
                        return fmt.Errorf("etcd host must be set")
                }

        default:
                return fmt.Errorf("unknown backend, must be either '%v', "+
                        "'%v', '%v' or '%v'", BoltBackend, EtcdBackend,
                        PostgresBackend, SqliteBackend)
        }

        // The path finding uses a manual read transaction that's open for a
        // potentially long time. That works fine with the locking model of
        // bbolt but can lead to locks or rolled back transactions with etcd or
        // postgres. And since we already have a smaller memory footprint for
        // remote database setups (due to not needing to memory-map the bbolt DB
        // files), we can keep the graph in memory instead. But for mobile
        // devices the tradeoff between a smaller memory footprint and the
        // longer time needed for path finding might be a desirable one.
        if db.NoGraphCache && db.Backend != BoltBackend {
                return fmt.Errorf("cannot use no-graph-cache with database "+
                        "backend '%v'", db.Backend)
        }

        return nil
}

// Init should be called upon start to pre-initialize database access dependent
// on configuration.
func (db *DB) Init(ctx context.Context, dbPath string) error {
        // Start embedded etcd server if requested.
        switch {
        case db.Backend == EtcdBackend && db.Etcd.Embedded:
                cfg, _, err := kvdb.StartEtcdTestBackend(
                        dbPath, db.Etcd.EmbeddedClientPort,
                        db.Etcd.EmbeddedPeerPort, db.Etcd.EmbeddedLogFile,
                )
                if err != nil {
                        return err
                }

                // Override the original config with the config for
                // the embedded instance.
                db.Etcd = cfg

        case db.Backend == PostgresBackend:
                sqlbase.Init(db.Postgres.MaxConnections)

        case db.Backend == SqliteBackend:
                sqlbase.Init(db.Sqlite.MaxConnections)
        }

        return nil
}

// DatabaseBackends is a two-tuple that holds the set of active database
// backends for the daemon. The two backends we expose are the graph database
// backend, and the channel state backend.
type DatabaseBackends struct {
        // GraphDB points to the database backend that contains the less
        // critical data that is accessed often, such as the channel graph and
        // chain height hints.
        GraphDB kvdb.Backend

        // ChanStateDB points to a possibly networked replicated backend that
        // contains the critical channel state related data.
        ChanStateDB kvdb.Backend

        // HeightHintDB points to a possibly networked replicated backend that
        // contains the chain height hint related data.
        HeightHintDB kvdb.Backend

        // MacaroonDB points to a database backend that stores the macaroon root
        // keys.
        MacaroonDB kvdb.Backend

        // DecayedLogDB points to a database backend that stores the decayed log
        // data.
        DecayedLogDB kvdb.Backend

        // TowerClientDB points to a database backend that stores the watchtower
        // client data. This might be nil if the watchtower client is disabled.
        TowerClientDB kvdb.Backend

        // TowerServerDB points to a database backend that stores the watchtower
        // server data. This might be nil if the watchtower server is disabled.
        TowerServerDB kvdb.Backend

        // WalletDB is an option that instructs the wallet loader where to load
        // the underlying wallet database from.
        WalletDB btcwallet.LoaderOption

        // NativeSQLStore is a pointer to a native SQL store that can be used
        // for native SQL queries for tables that already support it. This may
        // be nil if the use-native-sql flag was not set.
        NativeSQLStore *sqldb.BaseDB

        // Remote indicates whether the database backends are remote, possibly
        // replicated instances or local bbolt or sqlite backed databases.
        Remote bool

        // CloseFuncs is a map of close functions for each of the initialized
        // DB backends keyed by their namespace name.
        CloseFuncs map[string]func() error
}

// GetPostgresConfigKVDB converts a sqldb.PostgresConfig to a kvdb
// postgres.Config.
func GetPostgresConfigKVDB(cfg *sqldb.PostgresConfig) *postgres.Config {
        return &postgres.Config{
                Dsn:            cfg.Dsn,
                Timeout:        cfg.Timeout,
                MaxConnections: cfg.MaxConnections,
        }
}

// GetSqliteConfigKVDB converts a sqldb.SqliteConfig to a kvdb sqlite.Config.
func GetSqliteConfigKVDB(cfg *sqldb.SqliteConfig) *sqlite.Config {
        return &sqlite.Config{
                Timeout:        cfg.Timeout,
                BusyTimeout:    cfg.BusyTimeout,
                MaxConnections: cfg.MaxConnections,
                PragmaOptions:  cfg.PragmaOptions,
        }
}

// GetBackends returns a set of kvdb.Backends as set in the DB config.
func (db *DB) GetBackends(ctx context.Context, chanDBPath,
        walletDBPath, towerServerDBPath string, towerClientEnabled,
        towerServerEnabled bool, logger btclog.Logger) (*DatabaseBackends,
        error) {

        // We keep track of all the kvdb backends we actually open and return a
        // reference to their close function so they can be cleaned up properly
        // on error or shutdown.
        closeFuncs := make(map[string]func() error)

        // If we need to return early because of an error, we invoke any close
        // function that has been initialized so far.
        returnEarly := true
        defer func() {
                if !returnEarly {
                        return
                }

                for _, closeFunc := range closeFuncs {
                        _ = closeFunc()
                }
        }()

        switch db.Backend {
        case EtcdBackend:
                // As long as the graph data, channel state and height hint
                // cache are all still in the channel.db file in bolt, we
                // replicate the same behavior here and use the same etcd
                // backend for those three sub DBs. But we namespace it properly
                // to make such a split even easier in the future. This will
                // break lnd for users that ran on etcd with 0.13.x since that
                // code used the root namespace. We assume that nobody used etcd
                // for mainnet just yet since that feature was clearly marked as
                // experimental in 0.13.x.
                etcdBackend, err := kvdb.Open(
                        kvdb.EtcdBackendName, ctx,
                        db.Etcd.CloneWithSubNamespace(NSChannelDB),
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening etcd DB: %w", err)
                }
                closeFuncs[NSChannelDB] = etcdBackend.Close

                etcdMacaroonBackend, err := kvdb.Open(
                        kvdb.EtcdBackendName, ctx,
                        db.Etcd.CloneWithSubNamespace(NSMacaroonDB),
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening etcd macaroon "+
                                "DB: %v", err)
                }
                closeFuncs[NSMacaroonDB] = etcdMacaroonBackend.Close

                etcdDecayedLogBackend, err := kvdb.Open(
                        kvdb.EtcdBackendName, ctx,
                        db.Etcd.CloneWithSubNamespace(NSDecayedLogDB),
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening etcd decayed "+
                                "log DB: %v", err)
                }
                closeFuncs[NSDecayedLogDB] = etcdDecayedLogBackend.Close

                etcdTowerClientBackend, err := kvdb.Open(
                        kvdb.EtcdBackendName, ctx,
                        db.Etcd.CloneWithSubNamespace(NSTowerClientDB),
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening etcd tower "+
                                "client DB: %v", err)
                }
                closeFuncs[NSTowerClientDB] = etcdTowerClientBackend.Close

                etcdTowerServerBackend, err := kvdb.Open(
                        kvdb.EtcdBackendName, ctx,
                        db.Etcd.CloneWithSubNamespace(NSTowerServerDB),
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening etcd tower "+
                                "server DB: %v", err)
                }
                closeFuncs[NSTowerServerDB] = etcdTowerServerBackend.Close

                etcdWalletBackend, err := kvdb.Open(
                        kvdb.EtcdBackendName, ctx,
                        db.Etcd.
                                CloneWithSubNamespace(NSWalletDB).
                                CloneWithSingleWriter(),
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening etcd macaroon "+
                                "DB: %v", err)
                }
                closeFuncs[NSWalletDB] = etcdWalletBackend.Close

                returnEarly = false

                return &DatabaseBackends{
                        GraphDB:       etcdBackend,
                        ChanStateDB:   etcdBackend,
                        HeightHintDB:  etcdBackend,
                        MacaroonDB:    etcdMacaroonBackend,
                        DecayedLogDB:  etcdDecayedLogBackend,
                        TowerClientDB: etcdTowerClientBackend,
                        TowerServerDB: etcdTowerServerBackend,
                        // The wallet loader will attempt to use/create the
                        // wallet in the replicated remote DB if we're running
                        // in a clustered environment. This will ensure that all
                        // members of the cluster have access to the same wallet
                        // state.
                        WalletDB: btcwallet.LoaderWithExternalWalletDB(
                                etcdWalletBackend,
                        ),
                        Remote:     true,
                        CloseFuncs: closeFuncs,
                }, nil

        case PostgresBackend:
                // Convert the sqldb PostgresConfig to a kvdb postgres.Config.
                // This is a temporary measure until we migrate all kvdb SQL
                // users to native SQL.
                postgresConfig := GetPostgresConfigKVDB(db.Postgres)

                postgresBackend, err := kvdb.Open(
                        kvdb.PostgresBackendName, ctx,
                        postgresConfig, NSChannelDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening postgres graph "+
                                "DB: %v", err)
                }
                closeFuncs[NSChannelDB] = postgresBackend.Close

                postgresMacaroonBackend, err := kvdb.Open(
                        kvdb.PostgresBackendName, ctx,
                        postgresConfig, NSMacaroonDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening postgres "+
                                "macaroon DB: %v", err)
                }
                closeFuncs[NSMacaroonDB] = postgresMacaroonBackend.Close

                postgresDecayedLogBackend, err := kvdb.Open(
                        kvdb.PostgresBackendName, ctx,
                        postgresConfig, NSDecayedLogDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening postgres "+
                                "decayed log DB: %v", err)
                }
                closeFuncs[NSDecayedLogDB] = postgresDecayedLogBackend.Close

                postgresTowerClientBackend, err := kvdb.Open(
                        kvdb.PostgresBackendName, ctx,
                        postgresConfig, NSTowerClientDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening postgres tower "+
                                "client DB: %v", err)
                }
                closeFuncs[NSTowerClientDB] = postgresTowerClientBackend.Close

                postgresTowerServerBackend, err := kvdb.Open(
                        kvdb.PostgresBackendName, ctx,
                        postgresConfig, NSTowerServerDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening postgres tower "+
                                "server DB: %v", err)
                }
                closeFuncs[NSTowerServerDB] = postgresTowerServerBackend.Close

                postgresWalletBackend, err := kvdb.Open(
                        kvdb.PostgresBackendName, ctx,
                        postgresConfig, NSWalletDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening postgres macaroon "+
                                "DB: %v", err)
                }
                closeFuncs[NSWalletDB] = postgresWalletBackend.Close

                var nativeSQLStore *sqldb.BaseDB
                if db.UseNativeSQL {
                        nativePostgresStore, err := sqldb.NewPostgresStore(
                                db.Postgres,
                        )
                        if err != nil {
                                return nil, fmt.Errorf("error opening "+
                                        "native postgres store: %v", err)
                        }

                        nativeSQLStore = nativePostgresStore.BaseDB
                        closeFuncs[PostgresBackend] = nativePostgresStore.Close
                }

                // Warn if the user is trying to switch over to a Postgres DB
                // while there is a wallet or channel bbolt DB still present.
                warnExistingBoltDBs(
                        logger, "postgres", walletDBPath, WalletDBName,
                )
                warnExistingBoltDBs(
                        logger, "postgres", chanDBPath, ChannelDBName,
                )

                returnEarly = false

                return &DatabaseBackends{
                        GraphDB:       postgresBackend,
                        ChanStateDB:   postgresBackend,
                        HeightHintDB:  postgresBackend,
                        MacaroonDB:    postgresMacaroonBackend,
                        DecayedLogDB:  postgresDecayedLogBackend,
                        TowerClientDB: postgresTowerClientBackend,
                        TowerServerDB: postgresTowerServerBackend,
                        // The wallet loader will attempt to use/create the
                        // wallet in the replicated remote DB if we're running
                        // in a clustered environment. This will ensure that all
                        // members of the cluster have access to the same wallet
                        // state.
                        WalletDB: btcwallet.LoaderWithExternalWalletDB(
                                postgresWalletBackend,
                        ),
                        NativeSQLStore: nativeSQLStore,
                        Remote:         true,
                        CloseFuncs:     closeFuncs,
                }, nil

        case SqliteBackend:
                // Convert the sqldb SqliteConfig to a kvdb sqlite.Config.
                // This is a temporary measure until we migrate all kvdb SQL
                // users to native SQL.
                sqliteConfig := GetSqliteConfigKVDB(db.Sqlite)

                // Note that for sqlite, we put kv tables for the channel.db,
                // wtclient.db and sphinxreplay.db all in the channel.sqlite db.
                // The tables for wallet.db and macaroon.db are in the
                // chain.sqlite db and watchtower.db tables are in the
                // watchtower.sqlite db. The reason for the multiple sqlite dbs
                // is twofold. The first reason is that it maintains the file
                // structure that users are used to. The second reason is the
                // fact that sqlite only supports one writer at a time which
                // would cause deadlocks in the code due to the wallet db often
                // being accessed during a write to another db.
                sqliteBackend, err := kvdb.Open(
                        kvdb.SqliteBackendName, ctx, sqliteConfig, chanDBPath,
                        SqliteChannelDBName, NSChannelDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening sqlite graph "+
                                "DB: %v", err)
                }
                closeFuncs[NSChannelDB] = sqliteBackend.Close

                sqliteMacaroonBackend, err := kvdb.Open(
                        kvdb.SqliteBackendName, ctx, sqliteConfig, walletDBPath,
                        SqliteChainDBName, NSMacaroonDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening sqlite "+
                                "macaroon DB: %v", err)
                }
                closeFuncs[NSMacaroonDB] = sqliteMacaroonBackend.Close

                sqliteDecayedLogBackend, err := kvdb.Open(
                        kvdb.SqliteBackendName, ctx, sqliteConfig, chanDBPath,
                        SqliteChannelDBName, NSDecayedLogDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening sqlite decayed "+
                                "log DB: %v", err)
                }
                closeFuncs[NSDecayedLogDB] = sqliteDecayedLogBackend.Close

                sqliteTowerClientBackend, err := kvdb.Open(
                        kvdb.SqliteBackendName, ctx, sqliteConfig, chanDBPath,
                        SqliteChannelDBName, NSTowerClientDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening sqlite tower "+
                                "client DB: %v", err)
                }
                closeFuncs[NSTowerClientDB] = sqliteTowerClientBackend.Close

                sqliteTowerServerBackend, err := kvdb.Open(
                        kvdb.SqliteBackendName, ctx, sqliteConfig,
                        towerServerDBPath, SqliteTowerDBName, NSTowerServerDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening sqlite tower "+
                                "server DB: %v", err)
                }
                closeFuncs[NSTowerServerDB] = sqliteTowerServerBackend.Close

                sqliteWalletBackend, err := kvdb.Open(
                        kvdb.SqliteBackendName, ctx, sqliteConfig, walletDBPath,
                        SqliteChainDBName, NSWalletDB,
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening sqlite macaroon "+
                                "DB: %v", err)
                }
                closeFuncs[NSWalletDB] = sqliteWalletBackend.Close

                var nativeSQLStore *sqldb.BaseDB
                if db.UseNativeSQL {
                        nativeSQLiteStore, err := sqldb.NewSqliteStore(
                                db.Sqlite,
                                path.Join(chanDBPath, SqliteNativeDBName),
                        )
                        if err != nil {
                                return nil, fmt.Errorf("error opening "+
                                        "native SQLite store: %v", err)
                        }

                        nativeSQLStore = nativeSQLiteStore.BaseDB
                        closeFuncs[SqliteBackend] = nativeSQLiteStore.Close
                }

                // Warn if the user is trying to switch over to a sqlite DB
                // while there is a wallet or channel bbolt DB still present.
                warnExistingBoltDBs(
                        logger, "sqlite", walletDBPath, WalletDBName,
                )
                warnExistingBoltDBs(
                        logger, "sqlite", chanDBPath, ChannelDBName,
                )

                returnEarly = false

                return &DatabaseBackends{
                        GraphDB:       sqliteBackend,
                        ChanStateDB:   sqliteBackend,
                        HeightHintDB:  sqliteBackend,
                        MacaroonDB:    sqliteMacaroonBackend,
                        DecayedLogDB:  sqliteDecayedLogBackend,
                        TowerClientDB: sqliteTowerClientBackend,
                        TowerServerDB: sqliteTowerServerBackend,
                        // The wallet loader will attempt to use/create the
                        // wallet in the replicated remote DB if we're running
                        // in a clustered environment. This will ensure that all
                        // members of the cluster have access to the same wallet
                        // state.
                        WalletDB: btcwallet.LoaderWithExternalWalletDB(
                                sqliteWalletBackend,
                        ),
                        NativeSQLStore: nativeSQLStore,
                        CloseFuncs:     closeFuncs,
                }, nil
        }

        // We're using all bbolt based databases by default.
        boltBackend, err := kvdb.GetBoltBackend(&kvdb.BoltBackendConfig{
                DBPath:            chanDBPath,
                DBFileName:        ChannelDBName,
                DBTimeout:         db.Bolt.DBTimeout,
                NoFreelistSync:    db.Bolt.NoFreelistSync,
                AutoCompact:       db.Bolt.AutoCompact,
                AutoCompactMinAge: db.Bolt.AutoCompactMinAge,
        })
        if err != nil {
                return nil, fmt.Errorf("error opening bolt DB: %w", err)
        }
        closeFuncs[NSChannelDB] = boltBackend.Close

        macaroonBackend, err := kvdb.GetBoltBackend(&kvdb.BoltBackendConfig{
                DBPath:            walletDBPath,
                DBFileName:        MacaroonDBName,
                DBTimeout:         db.Bolt.DBTimeout,
                NoFreelistSync:    db.Bolt.NoFreelistSync,
                AutoCompact:       db.Bolt.AutoCompact,
                AutoCompactMinAge: db.Bolt.AutoCompactMinAge,
        })
        if err != nil {
                return nil, fmt.Errorf("error opening macaroon DB: %w", err)
        }
        closeFuncs[NSMacaroonDB] = macaroonBackend.Close

        decayedLogBackend, err := kvdb.GetBoltBackend(&kvdb.BoltBackendConfig{
                DBPath:            chanDBPath,
                DBFileName:        DecayedLogDbName,
                DBTimeout:         db.Bolt.DBTimeout,
                NoFreelistSync:    db.Bolt.NoFreelistSync,
                AutoCompact:       db.Bolt.AutoCompact,
                AutoCompactMinAge: db.Bolt.AutoCompactMinAge,
        })
        if err != nil {
                return nil, fmt.Errorf("error opening decayed log DB: %w", err)
        }
        closeFuncs[NSDecayedLogDB] = decayedLogBackend.Close

        // The tower client is optional and might not be enabled by the user. We
        // handle it being nil properly in the main server.
        var towerClientBackend kvdb.Backend
        if towerClientEnabled {
                towerClientBackend, err = kvdb.GetBoltBackend(
                        &kvdb.BoltBackendConfig{
                                DBPath:            chanDBPath,
                                DBFileName:        TowerClientDBName,
                                DBTimeout:         db.Bolt.DBTimeout,
                                NoFreelistSync:    db.Bolt.NoFreelistSync,
                                AutoCompact:       db.Bolt.AutoCompact,
                                AutoCompactMinAge: db.Bolt.AutoCompactMinAge,
                        },
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening tower client "+
                                "DB: %v", err)
                }
                closeFuncs[NSTowerClientDB] = towerClientBackend.Close
        }

        // The tower server is optional and might not be enabled by the user. We
        // handle it being nil properly in the main server.
        var towerServerBackend kvdb.Backend
        if towerServerEnabled {
                towerServerBackend, err = kvdb.GetBoltBackend(
                        &kvdb.BoltBackendConfig{
                                DBPath:            towerServerDBPath,
                                DBFileName:        TowerServerDBName,
                                DBTimeout:         db.Bolt.DBTimeout,
                                NoFreelistSync:    db.Bolt.NoFreelistSync,
                                AutoCompact:       db.Bolt.AutoCompact,
                                AutoCompactMinAge: db.Bolt.AutoCompactMinAge,
                        },
                )
                if err != nil {
                        return nil, fmt.Errorf("error opening tower server "+
                                "DB: %v", err)
                }
                closeFuncs[NSTowerServerDB] = towerServerBackend.Close
        }

        returnEarly = false

        return &DatabaseBackends{
                GraphDB:       boltBackend,
                ChanStateDB:   boltBackend,
                HeightHintDB:  boltBackend,
                MacaroonDB:    macaroonBackend,
                DecayedLogDB:  decayedLogBackend,
                TowerClientDB: towerClientBackend,
                TowerServerDB: towerServerBackend,
                // When "running locally", LND will use the bbolt wallet.db to
                // store the wallet located in the chain data dir, parametrized
                // by the active network. The wallet loader has its own cleanup
                // method so we don't need to add anything to our map (in fact
                // nothing is opened just yet).
                WalletDB: btcwallet.LoaderWithLocalWalletDB(
                        walletDBPath, db.Bolt.NoFreelistSync, db.Bolt.DBTimeout,
                ),
                CloseFuncs: closeFuncs,
        }, nil
}

// warnExistingBoltDBs checks if there is an existing bbolt database in the
// given location and logs a warning if so.
func warnExistingBoltDBs(log btclog.Logger, dbType, dir, fileName string) {
        if lnrpc.FileExists(filepath.Join(dir, fileName)) {
                log.Warnf("Found existing bbolt database file in %s/%s while "+
                        "using database type %s. Existing data will NOT be "+
                        "migrated to %s automatically!", dir, fileName, dbType,
                        dbType)
        }
}

// Compile-time constraint to ensure Workers implements the Validator interface.
var _ Validator = (*DB)(nil)

lightningnetwork / lnd / 12343072627

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