use the more idiomatic FoundationDB KeySelectors

weed/filer/foundationdb/foundationdb_store.go

@@ -307,47 +307,52 @@ func (store *FoundationDBStore) ListDirectoryPrefixedEntries(ctx context.Context
 		return "", fmt.Errorf("creating prefix range for %s: %v", dirPath, err)
 	}
 
-	// Determine start key based on startFileName and prefix
+	// Determine start key and selector based on startFileName and prefix
 	var startKey fdb.Key
+	var beginSelector fdb.KeySelector
+
 	if startFileName != "" {
 		// Start from the specified file
-		if !includeStartFile {
-			// Use next possible tuple to exclude start key (append \x00 to fileName in tuple, not to packed bytes)
-			startKey = store.seaweedfsDir.Pack(tuple.Tuple{string(dirPath), startFileName + "\x00"})
+		startKey = store.seaweedfsDir.Pack(tuple.Tuple{string(dirPath), startFileName})
+		// Use KeySelector for idiomatic FDB range scanning
+		if includeStartFile {
+			beginSelector = fdb.FirstGreaterOrEqual(startKey)
 		} else {
-			startKey = store.seaweedfsDir.Pack(tuple.Tuple{string(dirPath), startFileName})
+			beginSelector = fdb.FirstGreaterThan(startKey)
 		}
 		// If prefix is specified and startFileName doesn't match, adjust
 		if prefix != "" && !strings.HasPrefix(startFileName, prefix) {
 			if startFileName < prefix {
 				// Start from prefix if startFileName is before it
 				startKey = store.seaweedfsDir.Pack(tuple.Tuple{string(dirPath), prefix})
+				beginSelector = fdb.FirstGreaterOrEqual(startKey)
 			}
 		}
 	} else if prefix != "" {
 		// Start from prefix
 		startKey = store.seaweedfsDir.Pack(tuple.Tuple{string(dirPath), prefix})
+		beginSelector = fdb.FirstGreaterOrEqual(startKey)
 	} else {
 		// Start from beginning of directory
-		startKey = dirRange.Begin
+		beginSelector = fdb.FirstGreaterOrEqual(dirRange.Begin)
 	}
 
-	// End key is from the directory range
-	endKey := dirRange.End
+	// End selector is from the directory range
+	endSelector := fdb.FirstGreaterOrEqual(dirRange.End)
 
 	var kvs []fdb.KeyValue
 	var rangeErr error
 	// Check if there's a transaction in context
 	if tx, exists := store.getTransactionFromContext(ctx); exists {
-		kr := fdb.KeyRange{Begin: startKey, End: endKey}
-		kvs, rangeErr = tx.GetRange(kr, fdb.RangeOptions{Limit: int(limit)}).GetSliceWithError()
+		sr := fdb.SelectorRange{Begin: beginSelector, End: endSelector}
+		kvs, rangeErr = tx.GetRange(sr, fdb.RangeOptions{Limit: int(limit)}).GetSliceWithError()
 		if rangeErr != nil {
 			return "", fmt.Errorf("scanning %s: %v", dirPath, rangeErr)
 		}
 	} else {
 		result, err := store.database.ReadTransact(func(rtr fdb.ReadTransaction) (interface{}, error) {
-			kr := fdb.KeyRange{Begin: startKey, End: endKey}
-			kvSlice, err := rtr.GetRange(kr, fdb.RangeOptions{Limit: int(limit)}).GetSliceWithError()
+			sr := fdb.SelectorRange{Begin: beginSelector, End: endSelector}
+			kvSlice, err := rtr.GetRange(sr, fdb.RangeOptions{Limit: int(limit)}).GetSliceWithError()
 			if err != nil {
 				return nil, err
 			}