change ReplaceEvent() interface to return a list of the events deleted.

eventstore/bleve/lib.go

@@ -103,13 +103,13 @@ func (b *BleveBackend) Init() error {
 	if b.RawEventStore == nil {
 		return fmt.Errorf("missing RawEventStore")
 	}
+	if len(b.Languages) == 0 {
+		return fmt.Errorf("missing Languages")
+	}
 	if len(b.IndexableKinds) == 0 {
 		b.IndexableKinds = []nostr.Kind{0, 1, 6, 11, 16, 20, 21, 22, 24, 1111, 9802, 30023, 30818}
 	}
 
-	if len(b.Languages) == 0 {
-		b.Languages = SupportedLanguages
-	}
 	validLanguages := make([]lingua.Language, 0, len(b.Languages))
 	b.languageCodes = make([]string, 0, len(b.Languages))
 	for _, lang := range b.Languages {

eventstore/boltdb/replace.go

@@ -8,8 +8,8 @@ import (
 	"go.etcd.io/bbolt"
 )
 
-func (b *BoltBackend) ReplaceEvent(evt nostr.Event) error {
-	return b.DB.Update(func(txn *bbolt.Tx) error {
+func (b *BoltBackend) ReplaceEvent(evt nostr.Event) (deleted []nostr.Event, err error) {
+	err = b.DB.Update(func(txn *bbolt.Tx) error {
 		rawBucket := txn.Bucket(rawEventStore)
 
 		// check if we already have this id
@@ -25,12 +25,12 @@ func (b *BoltBackend) ReplaceEvent(evt nostr.Event) error {
 		}
 
 		// now we fetch the past events, whatever they are, delete them and then save the new
-		var err error
+		var qerr error
 		var results iter.Seq[nostr.Event] = func(yield func(nostr.Event) bool) {
-			err = b.query(txn, filter, 10 /* in theory limit could be just 1 and this should work */, yield)
+			qerr = b.query(txn, filter, 10 /* in theory limit could be just 1 and this should work */, yield)
 		}
-		if err != nil {
-			return fmt.Errorf("failed to query past events with %s: %w", filter, err)
+		if qerr != nil {
+			return fmt.Errorf("failed to query past events with %s: %w", filter, qerr)
 		}
 
 		shouldStore := true
@@ -39,6 +39,7 @@ func (b *BoltBackend) ReplaceEvent(evt nostr.Event) error {
 				if err := b.delete(txn, previous.ID); err != nil {
 					return fmt.Errorf("failed to delete event %s for replacing: %w", previous.ID, err)
 				}
+				deleted = append(deleted, previous)
 			} else {
 				// there is a newer event already stored, so we won't store this
 				shouldStore = false
@@ -50,4 +51,5 @@ func (b *BoltBackend) ReplaceEvent(evt nostr.Event) error {
 
 		return nil
 	})
+	return deleted, err
 }

eventstore/lmdb/replace.go

@@ -8,8 +8,8 @@ import (
 	"github.com/PowerDNS/lmdb-go/lmdb"
 )
 
-func (b *LMDBBackend) ReplaceEvent(evt nostr.Event) error {
-	return b.lmdbEnv.Update(func(txn *lmdb.Txn) error {
+func (b *LMDBBackend) ReplaceEvent(evt nostr.Event) (deleted []nostr.Event, err error) {
+	err = b.lmdbEnv.Update(func(txn *lmdb.Txn) error {
 		// check if we already have this id
 		_, existsErr := txn.Get(b.indexId, evt.ID[0:8])
 		if existsErr == nil {
@@ -26,20 +26,21 @@ func (b *LMDBBackend) ReplaceEvent(evt nostr.Event) error {
 		}
 
 		// now we fetch the past events, whatever they are, delete them and then save the new
-		var err error
+		var qerr error
 		var results iter.Seq[nostr.Event] = func(yield func(nostr.Event) bool) {
-			err = b.query(txn, filter, 10 /* in theory limit could be just 1 and this should work */, yield)
+			qerr = b.query(txn, filter, 10 /* in theory limit could be just 1 and this should work */, yield)
 		}
-		if err != nil {
-			return fmt.Errorf("failed to query past events with %s: %w", filter, err)
+		if qerr != nil {
+			return fmt.Errorf("failed to query past events with %s: %w", filter, qerr)
 		}
 
 		shouldStore := true
 		for previous := range results {
 			if nostr.IsOlder(previous, evt) {
-				if err := b.delete(txn, previous.ID); err != nil {
-					return fmt.Errorf("failed to delete event %s for replacing: %w", previous.ID, err)
+				if qerr := b.delete(txn, previous.ID); qerr != nil {
+					return fmt.Errorf("failed to delete event %s for replacing: %w", previous.ID, qerr)
 				}
+				deleted = append(deleted, previous)
 			} else {
 				// there is a newer event already stored, so we won't store this
 				shouldStore = false
@@ -51,4 +52,6 @@ func (b *LMDBBackend) ReplaceEvent(evt nostr.Event) error {
 
 		return nil
 	})
+
+	return deleted, err
 }

eventstore/mmm/replace.go

@@ -9,9 +9,9 @@ import (
 	"github.com/PowerDNS/lmdb-go/lmdb"
 )
 
-func (il *IndexingLayer) ReplaceEvent(evt nostr.Event) error {
+func (il *IndexingLayer) ReplaceEvent(evt nostr.Event) (deleted []nostr.Event, err error) {
 	if il.mmmm.ReadOnly {
-		return ReadOnly
+		return nil, ReadOnly
 	}
 
 	il.mmmm.writeMutex.Lock()
@@ -29,7 +29,7 @@ func (il *IndexingLayer) ReplaceEvent(evt nostr.Event) error {
 	// prepare transactions
 	mmmtxn, err := il.mmmm.lmdbEnv.BeginTxn(nil, 0)
 	if err != nil {
-		return err
+		return nil, err
 	}
 	defer func() {
 		// defer abort but only if we haven't committed (we'll set it to nil after committing)
@@ -41,7 +41,7 @@ func (il *IndexingLayer) ReplaceEvent(evt nostr.Event) error {
 
 	iltxn, err := il.lmdbEnv.BeginTxn(nil, 0)
 	if err != nil {
-		return err
+		return nil, err
 	}
 	defer func() {
 		// defer abort but only if we haven't committed (we'll set it to nil after committing)
@@ -54,33 +54,35 @@ func (il *IndexingLayer) ReplaceEvent(evt nostr.Event) error {
 	// check if we already have this id
 	_, existsErr := mmmtxn.Get(il.mmmm.indexId, evt.ID[0:8])
 	if existsErr == nil {
-		return nil
+		return nil, nil
 	}
 	if !lmdb.IsNotFound(existsErr) {
-		return fmt.Errorf("error checking existence: %w", existsErr)
+		return nil, fmt.Errorf("error checking existence: %w", existsErr)
 	}
 
 	// now we fetch the past events, whatever they are, delete them and then save the new
+	var qerr error
 	var results iter.Seq[nostr.Event] = func(yield func(nostr.Event) bool) {
-		err = il.query(iltxn, filter, 10 /* in theory limit could be just 1 and this should work */, yield)
+		qerr = il.query(iltxn, filter, 10 /* in theory limit could be just 1 and this should work */, yield)
 	}
-	if err != nil {
-		return fmt.Errorf("failed to query past events with %s: %w", filter, err)
+	if qerr != nil {
+		return nil, fmt.Errorf("failed to query past events with %s: %w", filter, qerr)
 	}
 
 	var acquiredFreeRangeFromDelete *position
 	shouldStore := true
 	for previous := range results {
 		if nostr.IsOlder(previous, evt) {
-			if pos, shouldPurge, err := il.delete(mmmtxn, iltxn, previous.ID); err != nil {
-				return fmt.Errorf("failed to delete event %s for replacing: %w", previous.ID, err)
+			if pos, shouldPurge, derr := il.delete(mmmtxn, iltxn, previous.ID); derr != nil {
+				return nil, fmt.Errorf("failed to delete event %s for replacing: %w", previous.ID, derr)
 			} else if shouldPurge {
 				// purge
 				if err := mmmtxn.Del(il.mmmm.indexId, previous.ID[0:8], nil); err != nil {
-					return err
+					return nil, err
 				}
 				acquiredFreeRangeFromDelete = &pos
 			}
+			deleted = append(deleted, previous)
 		} else {
 			// there is a newer event already stored, so we won't store this
 			shouldStore = false
@@ -90,17 +92,17 @@ func (il *IndexingLayer) ReplaceEvent(evt nostr.Event) error {
 	if shouldStore {
 		_, err := il.mmmm.storeOn(mmmtxn, iltxn, il, evt)
 		if err != nil {
-			return err
+			return nil, err
 		}
 	}
 
 	// commit in this order to minimize problematic inconsistencies
 	if err := mmmtxn.Commit(); err != nil {
-		return fmt.Errorf("can't commit mmmtxn: %w", err)
+		return nil, fmt.Errorf("can't commit mmmtxn: %w", err)
 	}
 	mmmtxn = nil
 	if err := iltxn.Commit(); err != nil {
-		return fmt.Errorf("can't commit iltxn: %w", err)
+		return nil, fmt.Errorf("can't commit iltxn: %w", err)
 	}
 	iltxn = nil
 
@@ -110,5 +112,5 @@ func (il *IndexingLayer) ReplaceEvent(evt nostr.Event) error {
 		il.mmmm.mergeNewFreeRange(*acquiredFreeRangeFromDelete)
 	}
 
-	return nil
+	return deleted, nil
 }

eventstore/nullstore/lib.go

@@ -29,8 +29,8 @@ func (b NullStore) SaveEvent(evt nostr.Event) error {
 	return nil
 }
 
-func (b NullStore) ReplaceEvent(evt nostr.Event) error {
-	return nil
+func (b NullStore) ReplaceEvent(evt nostr.Event) ([]nostr.Event, error) {
+	return nil, nil
 }
 
 func (b NullStore) CountEvents(filter nostr.Filter) (uint32, error) {

eventstore/slicestore/lib.go

@@ -122,7 +122,7 @@ func (b *SliceStore) delete(id nostr.ID) error {
 	return nil
 }
 
-func (b *SliceStore) ReplaceEvent(evt nostr.Event) error {
+func (b *SliceStore) ReplaceEvent(evt nostr.Event) (deleted []nostr.Event, err error) {
 	b.Lock()
 	defer b.Unlock()
 
@@ -135,8 +135,9 @@ func (b *SliceStore) ReplaceEvent(evt nostr.Event) error {
 	for previous := range b.QueryEvents(filter, 1) {
 		if nostr.IsOlder(previous, evt) {
 			if err := b.delete(previous.ID); err != nil {
-				return fmt.Errorf("failed to delete event for replacing: %w", err)
+				return nil, fmt.Errorf("failed to delete event for replacing: %w", err)
 			}
+			deleted = append(deleted, previous)
 		} else {
 			shouldStore = false
 		}
@@ -144,11 +145,11 @@ func (b *SliceStore) ReplaceEvent(evt nostr.Event) error {
 
 	if shouldStore {
 		if err := b.save(evt); err != nil && err != eventstore.ErrDupEvent {
-			return fmt.Errorf("failed to save: %w", err)
+			return nil, fmt.Errorf("failed to save: %w", err)
 		}
 	}
 
-	return nil
+	return deleted, nil
 }
 
 func eventTimestampComparator(e nostr.Event, t nostr.Timestamp) int {

eventstore/store.go

@@ -26,7 +26,7 @@ type Store interface {
 
 	// ReplaceEvent atomically replaces a replaceable or addressable event.
 	// Conceptually it is like a Query->Delete->Save, but streamlined.
-	ReplaceEvent(nostr.Event) error
+	ReplaceEvent(nostr.Event) (deleted []nostr.Event, err error)
 
 	// CountEvents counts all events that match a given filter
 	CountEvents(nostr.Filter) (uint32, error)

eventstore/wrappers/dynamic_publisher.go

@@ -36,5 +36,6 @@ func (w DynamicPublisher) Publish(ctx context.Context, evt nostr.Event) error {
 		}
 	}
 
-	return w.GetStore().ReplaceEvent(evt)
+	_, err := w.GetStore().ReplaceEvent(evt)
+	return err
 }

eventstore/wrappers/publisher.go

@@ -39,5 +39,6 @@ func (w StorePublisher) Publish(ctx context.Context, evt nostr.Event) error {
 	}
 
 	// others are replaced
-	return w.Store.ReplaceEvent(evt)
+	_, err := w.Store.ReplaceEvent(evt)
+	return err
 }

khatru/adding.go

@@ -46,7 +46,7 @@ func (rl *Relay) handleNormal(ctx context.Context, evt nostr.Event) (skipBroadca
 	} else {
 		// otherwise it's a replaceable
 		if nil != rl.ReplaceEvent {
-			if err := rl.ReplaceEvent(ctx, evt); err != nil {
+			if _, err := rl.ReplaceEvent(ctx, evt); err != nil {
 				switch err {
 				case eventstore.ErrDupEvent:
 					return true, nil

khatru/relay.go

@@ -68,7 +68,7 @@ type Relay struct {
 	// hooks that will be called at various times
 	OnEvent                   func(ctx context.Context, event nostr.Event) (reject bool, msg string)
 	StoreEvent                func(ctx context.Context, event nostr.Event) error
-	ReplaceEvent              func(ctx context.Context, event nostr.Event) error
+	ReplaceEvent              func(ctx context.Context, event nostr.Event) ([]nostr.Event, error)
 	DeleteEvent               func(ctx context.Context, id nostr.ID) error
 	OnEventSaved              func(ctx context.Context, event nostr.Event)
 	OnEventDeleted            func(ctx context.Context, deleted nostr.Event)
@@ -145,7 +145,7 @@ func (rl *Relay) UseEventstore(store eventstore.Store, maxQueryLimit int) {
 	rl.StoreEvent = func(ctx context.Context, event nostr.Event) error {
 		return store.SaveEvent(event)
 	}
-	rl.ReplaceEvent = func(ctx context.Context, event nostr.Event) error {
+	rl.ReplaceEvent = func(ctx context.Context, event nostr.Event) ([]nostr.Event, error) {
 		return store.ReplaceEvent(event)
 	}
 	rl.DeleteEvent = func(ctx context.Context, id nostr.ID) error {