ab279e68ed
This patch adds the power of GocqlX to UDTs.
Now you can make a struct be UDT compatible by adding a single line.
```
type FullName struct {
gocqlx.UDT
FirstName string
LastName string
}
```
Signed-off-by: Michał Matczuk <michal@scylladb.com>
75 lines
1.7 KiB
Go
75 lines
1.7 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 (
|
|
"fmt"
|
|
"reflect"
|
|
|
|
"github.com/gocql/gocql"
|
|
"github.com/scylladb/go-reflectx"
|
|
)
|
|
|
|
// UDT is a marker interface that needs to be embedded in a struct if you want
|
|
// to marshal or unmarshal it as a User Defined Type.
|
|
type UDT interface {
|
|
udt()
|
|
}
|
|
|
|
var (
|
|
_ gocql.UDTMarshaler = udt{}
|
|
_ gocql.UDTUnmarshaler = udt{}
|
|
)
|
|
|
|
type udt struct {
|
|
value reflect.Value
|
|
field map[string]reflect.Value
|
|
unsafe bool
|
|
}
|
|
|
|
func makeUDT(value reflect.Value, mapper *reflectx.Mapper, unsafe bool) udt {
|
|
return udt{
|
|
value: value,
|
|
field: mapper.FieldMap(value),
|
|
unsafe: unsafe,
|
|
}
|
|
}
|
|
|
|
func (u udt) MarshalUDT(name string, info gocql.TypeInfo) ([]byte, error) {
|
|
value, ok := u.field[name]
|
|
if !ok {
|
|
return nil, fmt.Errorf("missing name %q in %s", name, u.value.Type())
|
|
}
|
|
|
|
return gocql.Marshal(info, value.Interface())
|
|
}
|
|
|
|
func (u udt) UnmarshalUDT(name string, info gocql.TypeInfo, data []byte) error {
|
|
value, ok := u.field[name]
|
|
if !ok && !u.unsafe {
|
|
return fmt.Errorf("missing name %q in %s", name, u.value.Type())
|
|
}
|
|
|
|
return gocql.Unmarshal(info, data, value.Addr().Interface())
|
|
}
|
|
|
|
// udtWrapValue adds UDT wrapper if needed.
|
|
func udtWrapValue(value reflect.Value, mapper *reflectx.Mapper, unsafe bool) interface{} {
|
|
if value.Type().Implements(autoUDTInterface) {
|
|
return makeUDT(value, mapper, unsafe)
|
|
}
|
|
return value.Interface()
|
|
}
|
|
|
|
// udtWrapSlice adds UDT wrapper if needed.
|
|
func udtWrapSlice(mapper *reflectx.Mapper, unsafe bool, v []interface{}) []interface{} {
|
|
for i := range v {
|
|
if _, ok := v[i].(UDT); ok {
|
|
v[i] = makeUDT(reflect.ValueOf(v[i]), mapper, unsafe)
|
|
}
|
|
}
|
|
return v
|
|
}
|