[chore/performance] Further reduce nil uncached queries (#3267)

* [chore/performance] Further reduce nil uncached queries

* more checks

internal/db/bundb/conversation.go

@@ -313,7 +313,14 @@ func (c *conversationDB) DeleteConversationsByOwnerAccountID(ctx context.Context
 			return gtserror.Newf("error deleting conversations for account %s: %w", accountID, err)
 		}
 
-		// Delete any conversation-to-status links matching the deleted conversation IDs.
+		if len(deletedConversationIDs) == 0 {
+			// Nothing
+			// to delete.
+			return nil
+		}
+
+		// Delete any conversation-to-status links
+		// matching the deleted conversation IDs.
 		if _, err := tx.NewDelete().
 			Model((*gtsmodel.ConversationToStatus)(nil)).
 			Where("? IN (?)", bun.Ident("conversation_id"), bun.In(deletedConversationIDs)).

internal/db/bundb/filterkeyword.go

@@ -112,20 +112,25 @@ func (f *filterDB) getFilterKeywords(ctx context.Context, idColumn string, id st
 	// Get each filter keyword by ID from the cache or DB.
 	filterKeywords, err := f.state.Caches.DB.FilterKeyword.LoadIDs("ID",
 		filterKeywordIDs,
-		func(uncachedFilterKeywordIDs []string) ([]*gtsmodel.FilterKeyword, error) {
+		func(uncached []string) ([]*gtsmodel.FilterKeyword, error) {
-			uncachedFilterKeywords := make([]*gtsmodel.FilterKeyword, 0, len(uncachedFilterKeywordIDs))
+			// Avoid querying
+			// if none uncached.
+			count := len(uncached)
+			if count == 0 {
+				return nil, nil
+			}
 
-			// Scan from DB.
+			filterKeywords := make([]*gtsmodel.FilterKeyword, 0, count)
 			if err := f.db.
 				NewSelect().
-				Model(&uncachedFilterKeywords).
+				Model(&filterKeywords).
-				Where("? IN (?)", bun.Ident("id"), bun.In(uncachedFilterKeywordIDs)).
+				Where("? IN (?)", bun.Ident("id"), bun.In(uncached)).
 				Scan(ctx); err != nil {
 				return nil, err
 			}
 
 			// Compile all the keyword regular expressions.
-			uncachedFilterKeywords = slices.DeleteFunc(uncachedFilterKeywords, func(filterKeyword *gtsmodel.FilterKeyword) bool {
+			filterKeywords = slices.DeleteFunc(filterKeywords, func(filterKeyword *gtsmodel.FilterKeyword) bool {
 				if err := filterKeyword.Compile(); err != nil {
 					log.Errorf(ctx, "error compiling filter keyword regex: %v", err)
 					return true
@@ -133,7 +138,7 @@ func (f *filterDB) getFilterKeywords(ctx context.Context, idColumn string, id st
 				return false
 			})
 
-			return uncachedFilterKeywords, nil
+			return filterKeywords, nil
 		},
 	)
 	if err != nil {

internal/db/bundb/filterstatus.go

@@ -99,16 +99,23 @@ func (f *filterDB) getFilterStatuses(ctx context.Context, idColumn string, id st
 	// Get each filter status by ID from the cache or DB.
 	filterStatuses, err := f.state.Caches.DB.FilterStatus.LoadIDs("ID",
 		filterStatusIDs,
-		func(uncachedFilterStatusIDs []string) ([]*gtsmodel.FilterStatus, error) {
+		func(uncached []string) ([]*gtsmodel.FilterStatus, error) {
-			uncachedFilterStatuses := make([]*gtsmodel.FilterStatus, 0, len(uncachedFilterStatusIDs))
+			// Avoid querying
+			// if none uncached.
+			count := len(uncached)
+			if count == 0 {
+				return nil, nil
+			}
+
+			filterStatuses := make([]*gtsmodel.FilterStatus, 0, count)
 			if err := f.db.
 				NewSelect().
-				Model(&uncachedFilterStatuses).
+				Model(&filterStatuses).
-				Where("? IN (?)", bun.Ident("id"), bun.In(uncachedFilterStatusIDs)).
+				Where("? IN (?)", bun.Ident("id"), bun.In(uncached)).
 				Scan(ctx); err != nil {
 				return nil, err
 			}
-			return uncachedFilterStatuses, nil
+			return filterStatuses, nil
 		},
 	)
 	if err != nil {

internal/db/bundb/relationship_block.go

@@ -286,6 +286,12 @@ func (r *relationshipDB) DeleteAccountBlocks(ctx context.Context, accountID stri
 		return err
 	}
 
+	if len(blockIDs) == 0 {
+		// Nothing
+		// to delete.
+		return nil
+	}
+
 	defer func() {
 		// Invalidate all account's incoming / outoing blocks on return.
 		r.state.Caches.DB.Block.Invalidate("AccountID", accountID)

internal/db/bundb/relationship_follow.go

@@ -351,6 +351,12 @@ func (r *relationshipDB) DeleteAccountFollows(ctx context.Context, accountID str
 		return err
 	}
 
+	if len(followIDs) == 0 {
+		// Nothing
+		// to delete.
+		return nil
+	}
+
 	defer func() {
 		// Invalidate all account's incoming / outoing follows on return.
 		r.state.Caches.DB.Follow.Invalidate("AccountID", accountID)

internal/db/bundb/relationship_follow_req.go

@@ -387,6 +387,12 @@ func (r *relationshipDB) DeleteAccountFollowRequests(ctx context.Context, accoun
 		return err
 	}
 
+	if len(followReqIDs) == 0 {
+		// Nothing
+		// to delete.
+		return nil
+	}
+
 	defer func() {
 		// Invalidate all account's incoming / outoing follow requests on return.
 		r.state.Caches.DB.FollowRequest.Invalidate("AccountID", accountID)

internal/db/bundb/relationship_mute.go

@@ -249,6 +249,12 @@ func (r *relationshipDB) DeleteAccountMutes(ctx context.Context, accountID strin
 		return err
 	}
 
+	if len(muteIDs) == 0 {
+		// Nothing
+		// to delete.
+		return nil
+	}
+
 	defer func() {
 		// Invalidate all account's incoming / outoing mutes on return.
 		r.state.Caches.DB.UserMute.Invalidate("AccountID", accountID)

internal/db/bundb/timeline.go

@@ -351,6 +351,12 @@ func (t *timelineDB) GetListTimeline(
 		return nil, fmt.Errorf("error getting entries for list %s: %w", listID, err)
 	}
 
+	// If there's no list entries we can't
+	// possibly return anything for this list.
+	if len(listEntries) == 0 {
+		return make([]*gtsmodel.Status, 0), nil
+	}
+
 	// Extract just the IDs of each follow.
 	followIDs := make([]string, 0, len(listEntries))
 	for _, listEntry := range listEntries {