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value.go
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/
value.go
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package spankeys
import (
"fmt"
"reflect"
"time"
"cloud.google.com/go/civil"
"cloud.google.com/go/spanner"
proto3 "github.com/golang/protobuf/ptypes/struct"
sppb "google.golang.org/genproto/googleapis/spanner/v1"
)
func DecodeToInterface(gcv *spanner.GenericColumnValue, ptr interface{}) error {
_, isNull := gcv.Value.Kind.(*proto3.Value_NullValue)
switch gcv.Type.Code {
case sppb.TypeCode_BOOL:
if isNull {
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(spanner.NullBool{}))
return nil
}
var v bool
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_INT64:
if isNull {
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(spanner.NullInt64{}))
return nil
}
var v int64
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_FLOAT64:
if isNull {
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(spanner.NullFloat64{}))
return nil
}
var v float64
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_STRING:
if isNull {
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(spanner.NullString{}))
return nil
}
var v string
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_DATE:
if isNull {
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(spanner.NullDate{}))
return nil
}
var v civil.Date
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_TIMESTAMP:
if isNull {
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(spanner.NullTime{}))
return nil
}
var v time.Time
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_BYTES:
var v []byte
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_ARRAY:
if isNull {
return handleNullArray(gcv.Type.ArrayElementType.Code, ptr)
}
lv, err := getListValue(gcv.Value)
if err != nil {
return err
}
cnull := containsNull(lv)
switch gcv.Type.ArrayElementType.Code {
case sppb.TypeCode_BOOL:
if cnull {
v := make([]spanner.NullBool, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
}
v := make([]bool, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_INT64:
if cnull {
v := make([]spanner.NullInt64, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
}
v := make([]int64, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_FLOAT64:
if cnull {
v := make([]spanner.NullFloat64, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
}
v := make([]float64, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_STRING:
if cnull {
v := make([]spanner.NullString, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
}
v := make([]string, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_DATE:
if cnull {
v := make([]spanner.NullDate, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
}
v := make([]civil.Date, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_TIMESTAMP:
if cnull {
v := make([]spanner.NullTime, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
}
v := make([]time.Time, len(lv.Values))
if err := gcv.Decode(&v); err != nil {
return err
}
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_ARRAY:
return fmt.Errorf("nested ARRAY type is not supported")
case sppb.TypeCode_STRUCT:
return fmt.Errorf("STRUCT type in ARRAY is not supported")
default:
return fmt.Errorf("failed to decode GenericColumnValue(typeCode: %s, elementType: %s)", gcv.Type.Code, gcv.Type.ArrayElementType.Code)
}
case sppb.TypeCode_STRUCT:
return fmt.Errorf("STRUCT type is not supported")
}
return fmt.Errorf("failed to decode GenericColumnValue(typeCode: %s)", gcv.Type.Code)
}
func handleNullArray(elemCode sppb.TypeCode, ptr interface{}) error {
switch elemCode {
case sppb.TypeCode_BOOL:
var v []bool
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_INT64:
var v []int64
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_FLOAT64:
var v []float64
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_TIMESTAMP:
var v []time.Time
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_DATE:
var v []civil.Date
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_STRING:
var v []string
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_BYTES:
var v [][]byte
reflect.ValueOf(ptr).Elem().Set(reflect.ValueOf(v))
return nil
case sppb.TypeCode_ARRAY:
return fmt.Errorf("nested ARRAY type is not supported")
case sppb.TypeCode_STRUCT:
return fmt.Errorf("STRUCT type in ARRAY is not supported")
}
return fmt.Errorf("failed to decode NULL array element (unknown typecode: %d)", elemCode)
}
func getListValue(v *proto3.Value) (*proto3.ListValue, error) {
if x, ok := v.GetKind().(*proto3.Value_ListValue); ok && x != nil {
return x.ListValue, nil
}
return nil, fmt.Errorf("cannot convert to ListValue")
}
func containsNull(list *proto3.ListValue) bool {
for _, v := range list.Values {
_, isNull := v.Kind.(*proto3.Value_NullValue)
if isNull {
return true
}
}
return false
}