44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
package lmdb
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import (
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"context"
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"encoding/hex"
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"fmt"
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"github.com/PowerDNS/lmdb-go/lmdb"
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"github.com/nbd-wtf/go-nostr"
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)
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func (b *LMDBBackend) DeleteEvent(ctx context.Context, evt *nostr.Event) error {
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return b.lmdbEnv.Update(func(txn *lmdb.Txn) error {
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return b.delete(txn, evt)
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})
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}
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func (b *LMDBBackend) delete(txn *lmdb.Txn, evt *nostr.Event) error {
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idPrefix8, _ := hex.DecodeString(evt.ID[0 : 8*2])
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idx, err := txn.Get(b.indexId, idPrefix8)
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if lmdb.IsNotFound(err) {
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// we already do not have this
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return nil
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}
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if err != nil {
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return fmt.Errorf("failed to get current idx for deleting %x: %w", evt.ID[0:8*2], err)
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}
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// calculate all index keys we have for this event and delete them
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for k := range b.getIndexKeysForEvent(evt) {
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err := txn.Del(k.dbi, k.key, idx)
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if err != nil {
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return fmt.Errorf("failed to delete index entry %s for %x: %w", b.keyName(k), evt.ID[0:8*2], err)
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}
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}
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// delete the raw event
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if err := txn.Del(b.rawEventStore, idx, nil); err != nil {
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return fmt.Errorf("failed to delete raw event %x (idx %x): %w", evt.ID[0:8*2], idx, err)
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}
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return nil
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}
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