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rename.go
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rename.go
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package badger
import (
"fmt"
"github.com/dgraph-io/badger/v4"
"github.com/oasisprotocol/oasis-core/go/common"
"github.com/oasisprotocol/oasis-core/go/common/cbor"
"github.com/oasisprotocol/oasis-core/go/common/logging"
"github.com/oasisprotocol/oasis-core/go/storage/mkvs/db/api"
)
// RenameNamespace changes the namespace specified in the database.
func RenameNamespace(cfg *api.Config, newNamespace common.Namespace) error {
db := &badgerNodeDB{
logger: logging.GetLogger("mkvs/db/badger/rename"),
namespace: cfg.Namespace,
discardWriteLogs: cfg.DiscardWriteLogs,
}
opts := commonConfigToBadgerOptions(cfg, db)
var err error
if db.db, err = badger.OpenManaged(opts); err != nil {
return fmt.Errorf("failed to open database: %w", err)
}
defer db.Close()
tx := db.db.NewTransactionAt(tsMetadata, true)
defer tx.Discard()
item, err := tx.Get(metadataKeyFmt.Encode())
switch err {
case nil:
case badger.ErrKeyNotFound:
// Nothing to rename.
return nil
default:
return err
}
var meta metadata
err = item.Value(func(data []byte) error {
return cbor.UnmarshalTrusted(data, &meta.value)
})
if err != nil {
return fmt.Errorf("failed to load database metadata: %w", err)
}
// Sanity checks.
if meta.value.Version != dbVersion {
return fmt.Errorf("incompatible database version (expected: %d got: %d)",
dbVersion,
meta.value.Version,
)
}
if !meta.value.Namespace.Equal(&cfg.Namespace) {
return fmt.Errorf("incompatible namespace (expected: %s got: %s)",
cfg.Namespace,
meta.value.Namespace,
)
}
// Rename the namespace in database metadata.
meta.value.Namespace = newNamespace
if err = meta.save(tx); err != nil {
return fmt.Errorf("failed to save database metadata: %w", err)
}
if err = tx.CommitAt(tsMetadata, nil); err != nil {
return fmt.Errorf("failed to commit database metadata: %w", err)
}
return nil
}