eventstore: more consistent ErrDupEvent firing.

eventstore/lmdb/save.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"fiatjaf.com/nostr"
+	"fiatjaf.com/nostr/eventstore"
 	"fiatjaf.com/nostr/eventstore/codec/betterbinary"
 	"github.com/PowerDNS/lmdb-go/lmdb"
 )
@@ -32,6 +33,10 @@ func (b *LMDBBackend) SaveEvent(evt nostr.Event) error {
 			return b.save(txn, evt)
 		}
 
+		if err == nil {
+			return eventstore.ErrDupEvent
+		}
+
 		return err
 	})
 }

eventstore/mmm/save.go

@@ -10,6 +10,7 @@ import (
 	"unsafe"
 
 	"fiatjaf.com/nostr"
+	"fiatjaf.com/nostr/eventstore"
 	"fiatjaf.com/nostr/eventstore/codec/betterbinary"
 	"github.com/PowerDNS/lmdb-go/lmdb"
 )
@@ -80,7 +81,7 @@ func (b *MultiMmapManager) storeOn(
 			ilid := binary.BigEndian.Uint16(val[s : s+2])
 			if il.id == ilid {
 				// already on the specified layer, we can end here
-				return false, nil
+				return false, eventstore.ErrDupEvent
 			}
 		}
 	} else if !lmdb.IsNotFound(err) {

eventstore/wrappers/publisher.go

@@ -33,12 +33,11 @@ func (w StorePublisher) Publish(ctx context.Context, evt nostr.Event) error {
 		// regular events are just saved directly
 		if err := w.SaveEvent(evt); err != nil && err != eventstore.ErrDupEvent {
 			return fmt.Errorf("failed to save: %w", err)
+		} else {
+			return err
 		}
-		return nil
 	}
 
 	// others are replaced
-	w.Store.ReplaceEvent(evt)
-
-	return nil
+	return w.Store.ReplaceEvent(evt)
 }

eventstore/wrappers/reaction_overwrite.go

@@ -0,0 +1,33 @@
+package wrappers
+
+import (
+	"fiatjaf.com/nostr"
+	"fiatjaf.com/nostr/eventstore"
+)
+
+// UniqueReactionsWrapper ensures that only the latest reaction or poll response from an author to an event is kept.
+// When a new reaction (kind 7) or poll response (kind 1018) is received, it deletes any previous ones from the same author to the same event.
+type UniqueReactionsWrapper struct {
+	eventstore.Store
+}
+
+func (w *UniqueReactionsWrapper) SaveEvent(event nostr.Event) error {
+	// check if it's a reaction or poll response
+	if event.Kind == 7 || event.Kind == 1018 {
+		// find the referenced event ID
+		ref := event.Tags.Find("e")
+		if ref != nil {
+			// query for existing events of same kind from same author referencing the same event and delete them
+			for old := range w.Store.QueryEvents(nostr.Filter{
+				Authors: []nostr.PubKey{event.PubKey},
+				Kinds:   []nostr.Kind{event.Kind},
+				Tags:    nostr.TagMap{"e": []string{ref[1]}},
+			}, 1_000) {
+				w.Store.DeleteEvent(old.ID)
+			}
+		}
+	}
+
+	// Save the new event
+	return w.Store.SaveEvent(event)
+}