7355c8ba3a
In this commit, we modify the existing `GetBackend` method to now be called `GetBackends`. This new method will populate a new `RemoteDB` attribute based on if the replicated backend is active or not. As is, the local backend is used everywhere. An upcoming commit will once again re-enable the remote backend, in a hybrid manner.
99 lines
2.4 KiB
Go
99 lines
2.4 KiB
Go
package lncfg
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import (
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"context"
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"fmt"
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"github.com/lightningnetwork/lnd/channeldb/kvdb"
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)
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const (
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dbName = "channel.db"
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BoltBackend = "bolt"
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EtcdBackend = "etcd"
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)
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// DB holds database configuration for LND.
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type DB struct {
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Backend string `long:"backend" description:"The selected database backend."`
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Etcd *kvdb.EtcdConfig `group:"etcd" namespace:"etcd" description:"Etcd settings."`
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Bolt *kvdb.BoltConfig `group:"bolt" namespace:"bolt" description:"Bolt settings."`
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}
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// NewDB creates and returns a new default DB config.
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func DefaultDB() *DB {
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return &DB{
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Backend: BoltBackend,
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Bolt: &kvdb.BoltConfig{},
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}
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}
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// Validate validates the DB config.
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func (db *DB) Validate() error {
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switch db.Backend {
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case BoltBackend:
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case EtcdBackend:
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if db.Etcd.Host == "" {
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return fmt.Errorf("etcd host must be set")
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}
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default:
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return fmt.Errorf("unknown backend, must be either \"%v\" or \"%v\"",
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BoltBackend, EtcdBackend)
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}
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return nil
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}
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// DatabaseBackends is a two-tuple that holds the set of active database
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// backends for the daemon. The two backends we expose are the local database
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// backend, and the remote backend. The LocalDB attribute will always be
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// populated. However, the remote DB will only be set if a replicated database
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// is active.
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type DatabaseBackends struct {
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// LocalDB points to the local non-replicated backend.
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LocalDB kvdb.Backend
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// RemoteDB points to a possibly networked replicated backend. If no
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// replicated backend is active, then this pointer will be nil.
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RemoteDB kvdb.Backend
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}
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// GetBackends returns a set of kvdb.Backends as set in the DB config. The
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// local database will ALWAYS be non-nil, while the remote database will only
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// be populated if etcd is specified.
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func (db *DB) GetBackends(ctx context.Context, dbPath string,
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networkName string) (*DatabaseBackends, error) {
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var (
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localDB, remoteDB kvdb.Backend
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err error
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)
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if db.Backend == EtcdBackend {
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// Prefix will separate key/values in the db.
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remoteDB, err = kvdb.GetEtcdBackend(ctx, networkName, db.Etcd)
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if err != nil {
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return nil, err
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}
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}
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localDB, err = kvdb.GetBoltBackend(
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dbPath, dbName, !db.Bolt.SyncFreelist,
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)
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if err != nil {
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return nil, err
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}
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return &DatabaseBackends{
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LocalDB: localDB,
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RemoteDB: remoteDB,
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}, nil
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}
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// Compile-time constraint to ensure Workers implements the Validator interface.
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var _ Validator = (*DB)(nil)
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