bring in khatru and eventstore.

eventstore/bluge/replace.go

@@ -0,0 +1,44 @@
+package bluge
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/fiatjaf/eventstore"
+	"github.com/fiatjaf/eventstore/internal"
+	"github.com/nbd-wtf/go-nostr"
+)
+
+func (b *BlugeBackend) ReplaceEvent(ctx context.Context, evt *nostr.Event) error {
+	b.Lock()
+	defer b.Unlock()
+
+	filter := nostr.Filter{Limit: 1, Kinds: []int{evt.Kind}, Authors: []string{evt.PubKey}}
+	if nostr.IsAddressableKind(evt.Kind) {
+		filter.Tags = nostr.TagMap{"d": []string{evt.Tags.GetD()}}
+	}
+
+	ch, err := b.QueryEvents(ctx, filter)
+	if err != nil {
+		return fmt.Errorf("failed to query before replacing: %w", err)
+	}
+
+	shouldStore := true
+	for previous := range ch {
+		if internal.IsOlder(previous, evt) {
+			if err := b.DeleteEvent(ctx, previous); err != nil {
+				return fmt.Errorf("failed to delete event for replacing: %w", err)
+			}
+		} else {
+			shouldStore = false
+		}
+	}
+
+	if shouldStore {
+		if err := b.SaveEvent(ctx, evt); err != nil && err != eventstore.ErrDupEvent {
+			return fmt.Errorf("failed to save: %w", err)
+		}
+	}
+
+	return nil
+}