make lmdb and badger backends use a binary encoding instead of nson.

lmdb/delete.go

@@ -0,0 +1,50 @@
+package lmdb
+
+import (
+	"context"
+	"encoding/hex"
+
+	"github.com/bmatsuo/lmdb-go/lmdb"
+	"github.com/nbd-wtf/go-nostr"
+	nostr_binary "github.com/nbd-wtf/go-nostr/binary"
+)
+
+func (b *LMDBBackend) DeleteEvent(ctx context.Context, evt *nostr.Event) error {
+	err := b.lmdbEnv.Update(func(txn *lmdb.Txn) error {
+		id, _ := hex.DecodeString(evt.ID)
+		idx, err := txn.Get(b.indexId, id)
+		if operr, ok := err.(*lmdb.OpError); ok && operr.Errno == lmdb.NotFound {
+			// we already do not have this
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+
+		// fetch the event
+		val, err := txn.Get(b.rawEventStore, idx)
+		if err != nil {
+			return err
+		}
+
+		evt := &nostr.Event{}
+		if err := nostr_binary.Unmarshal(val, evt); err != nil {
+			return err
+		}
+
+		// calculate all index keys we have for this event and delete them
+		for _, k := range b.getIndexKeysForEvent(evt) {
+			if err := txn.Del(k.dbi, k.key, nil); err != nil {
+				return err
+			}
+		}
+
+		// delete the raw event
+		return txn.Del(b.rawEventStore, idx, nil)
+	})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}