67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
package badger
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import (
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"encoding/binary"
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"fmt"
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"github.com/dgraph-io/badger/v4"
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)
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func (b *BadgerBackend) runMigrations() error {
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return b.Update(func(txn *badger.Txn) error {
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var version uint16
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item, err := txn.Get([]byte{dbVersionKey})
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if err == badger.ErrKeyNotFound {
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version = 0
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} else if err != nil {
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return err
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} else {
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item.Value(func(val []byte) error {
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version = binary.BigEndian.Uint16(val)
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return nil
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})
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}
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// do the migrations in increasing steps (there is no rollback)
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//
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// the 3 first migrations go to trash because on version 3 we need to export and import all the data anyway
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if version < 3 {
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// if there is any data in the relay we will stop and notify the user,
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// otherwise we just set version to 3 and proceed
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prefix := []byte{indexIdPrefix}
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it := txn.NewIterator(badger.IteratorOptions{
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PrefetchValues: true,
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PrefetchSize: 100,
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Prefix: prefix,
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})
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defer it.Close()
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hasAnyEntries := false
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for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
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hasAnyEntries = true
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break
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}
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if hasAnyEntries {
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return fmt.Errorf("your database is at version %d, but in order to migrate up to version 3 you must manually export all the events and then import again: run an old version of this software, export the data, then delete the database files, run the new version, import the data back in.", version)
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}
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b.bumpVersion(txn, 3)
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}
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if version < 4 {
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// ...
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}
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return nil
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})
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}
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func (b *BadgerBackend) bumpVersion(txn *badger.Txn, version uint16) error {
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buf := make([]byte, 2)
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binary.BigEndian.PutUint16(buf, version)
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return txn.Set([]byte{dbVersionKey}, buf)
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}
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