sdk: fix default Publisher to work with any store.

eventstore/wrappers/dynamic_publisher.go

@@ -0,0 +1,40 @@
+package wrappers
+
+import (
+	"context"
+	"fmt"
+	"iter"
+
+	"fiatjaf.com/nostr"
+	"fiatjaf.com/nostr/eventstore"
+)
+
+var _ nostr.Publisher = DynamicPublisher{}
+
+type DynamicPublisher struct {
+	GetStore func() eventstore.Store
+	MaxLimit int
+}
+
+func (w DynamicPublisher) QueryEvents(filter nostr.Filter) iter.Seq[nostr.Event] {
+	return w.GetStore().QueryEvents(filter, w.MaxLimit)
+}
+
+func (w DynamicPublisher) Publish(ctx context.Context, evt nostr.Event) error {
+	if evt.Kind.IsEphemeral() {
+		return nil
+	}
+
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	if evt.Kind.IsRegular() {
+		if err := w.GetStore().SaveEvent(evt); err != nil && err != eventstore.ErrDupEvent {
+			return fmt.Errorf("failed to save: %w", err)
+		} else {
+			return err
+		}
+	}
+
+	return w.GetStore().ReplaceEvent(evt)
+}