eventstore: boltdb (copied from lmdb)

eventstore/boltdb/delete.go

@@ -0,0 +1,46 @@
+package bolt
+
+import (
+	"fmt"
+
+	"fiatjaf.com/nostr"
+	"fiatjaf.com/nostr/eventstore/codec/betterbinary"
+	"go.etcd.io/bbolt"
+)
+
+func (b *BoltBackend) DeleteEvent(id nostr.ID) error {
+	return b.DB.Update(func(txn *bbolt.Tx) error {
+		return b.delete(txn, id)
+	})
+}
+
+func (b *BoltBackend) delete(txn *bbolt.Tx, id nostr.ID) error {
+	rawBucket := txn.Bucket(rawEventStore)
+
+	// check if we have this actually
+	bin := rawBucket.Get(id[16:24])
+	if bin == nil {
+		// we already do not have this
+		return nil
+	}
+
+	var evt nostr.Event
+	if err := betterbinary.Unmarshal(bin, &evt); err != nil {
+		return fmt.Errorf("failed to unmarshal raw event %x to delete: %w", id, err)
+	}
+
+	// calculate all index keys we have for this event and delete them
+	for k := range b.getIndexKeysForEvent(evt) {
+		err := txn.Bucket(k.bucket).Delete(k.key)
+		if err != nil {
+			return fmt.Errorf("failed to delete index entry %s for %x: %w", b.keyName(k), evt.ID[0:8], err)
+		}
+	}
+
+	// delete the raw event
+	if err := rawBucket.Delete(id[16:24]); err != nil {
+		return fmt.Errorf("failed to delete raw event %x: %w", evt.ID[16:24], err)
+	}
+
+	return nil
+}