Files
gocqlx/gocqlx.go

62 lines
1.9 KiB
Go

// Copyright (C) 2017 ScyllaDB
// Use of this source code is governed by a ALv2-style
// license that can be found in the LICENSE file.
package gocqlx
import (
"errors"
"fmt"
"reflect"
gocql "github.com/apache/cassandra-gocql-driver/v2"
"github.com/scylladb/go-reflectx"
)
// structOnlyError returns an error appropriate for type when a non-scannable
// struct is expected but something else is given.
func structOnlyError(t reflect.Type) error {
if isStruct := t.Kind() == reflect.Struct; !isStruct {
return fmt.Errorf("expected a struct but got %s", t.Kind())
}
if isUnmarshaller := reflect.PointerTo(t).Implements(unmarshallerInterface); isUnmarshaller {
return fmt.Errorf("expected a struct but the provided struct type %s implements gocql.Unmarshaler", t.Name())
}
if isUDTUnmarshaller := reflect.PointerTo(t).Implements(udtUnmarshallerInterface); isUDTUnmarshaller {
return fmt.Errorf("expected a struct but the provided struct type %s implements gocql.UDTUnmarshaler", t.Name())
}
if isAutoUDT := reflect.PointerTo(t).Implements(autoUDTInterface); isAutoUDT {
return fmt.Errorf("expected a struct but the provided struct type %s implements gocqlx.UDT", t.Name())
}
return fmt.Errorf("expected a struct, but struct %s has no exported fields", t.Name())
}
// reflect helpers
var (
unmarshallerInterface = reflect.TypeOf((*gocql.Unmarshaler)(nil)).Elem()
udtUnmarshallerInterface = reflect.TypeOf((*gocql.UDTUnmarshaler)(nil)).Elem()
autoUDTInterface = reflect.TypeOf((*UDT)(nil)).Elem()
)
func baseType(t reflect.Type, expected reflect.Kind) (reflect.Type, error) {
t = reflectx.Deref(t)
if t.Kind() != expected {
return nil, fmt.Errorf("expected %s but got %s", expected, t.Kind())
}
return t, nil
}
func missingFields(transversals [][]int) (field int, err error) {
for i, t := range transversals {
if len(t) == 0 {
return i, errors.New("missing field")
}
}
return 0, nil
}