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converter.go
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converter.go
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package profitbricks
import (
"errors"
"fmt"
"github.com/ionos-cloud/sdk-go/v5"
"reflect"
"time"
)
type ConversionTarget string
const (
ConversionTargetCore ConversionTarget = "core"
ConversionTargetCompat = "compat"
)
var primitiveTypes = []reflect.Kind{
reflect.String, reflect.Bool, reflect.Chan, reflect.Complex64, reflect.Complex128,
reflect.Float32, reflect.Float64, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
}
/* compat field -> core field */
var CompatCoreFieldMap = map[string]string{
"ID": "Id",
"PBType": "Type",
"RAM": "Ram",
"VMState": "VmState",
"CPUFamily": "CpuFamily",
"CPUHotPlug": "CpuHotPlug",
"CPUHotUnplug": "CpuHotUnplug",
"RAMHotPlug": "RamHotPlug",
"RAMHotUnplug": "RamHotUnplug",
"IPs": "Ips",
"IPConsumers": "IpConsumers",
"FirewallRules": "Firewallrules",
"ReserveIP": "ReserveIp",
"URL": "Url",
"NodePools": "Nodepools",
"CreatedByUserID": "CreatedByUserId",
"LastModifiedByUserID": "LastModifiedByUserId",
"RAMSize": "RamSize",
"DatacenterID": "DatacenterId",
"KubeConfig": "Kubeconfig",
"PublicIPs": "PublicIps",
"S3CanonicalUserID": "S3CanonicalUserId",
}
/* custom caster, such as from *Type to string or *time.Time to string */
type CustomCaster struct {
From string
To string
/* performs the actual cast */
Cast func(value reflect.Value) reflect.Value
}
const (
dateLayout = "2006-01-02T15:04:05.000Z"
)
var CustomCasters = []CustomCaster{
{
From: "*Type",
To: "string",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(*ionoscloud.Type)
if v == nil {
return reflect.ValueOf("")
}
return reflect.ValueOf(string(*(v)))
},
},
{
From: "string",
To: "*Type",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(string)
if v == "" {
/* we need to avoid sending the type otherwise the api returns 422 because
* type is read only */
return reflect.Zero(reflect.TypeOf((*ionoscloud.Type)(nil)))
}
ret := ionoscloud.Type(value.Interface().(string))
return reflect.ValueOf(&ret)
},
},
{
From: "string",
To: "*Time",
Cast: func(value reflect.Value) reflect.Value {
str := value.Interface().(string)
if str == "" {
return reflect.Zero(reflect.TypeOf((*time.Time)(nil)))
}
createdDate, err := time.Parse(dateLayout, str)
if err != nil {
panic("Error parsing date " + str + "; expecting format " + dateLayout)
}
return reflect.ValueOf(&createdDate)
},
},
{
From: "*Time",
To: "string",
Cast: func(value reflect.Value) reflect.Value {
t := value.Interface().(*time.Time)
return reflect.ValueOf(t.Format(dateLayout))
},
},
{
From: "string",
To: "*IonosTime",
Cast: func(value reflect.Value) reflect.Value {
str := value.Interface().(string)
if str == "" {
return reflect.Zero(reflect.TypeOf((*ionoscloud.IonosTime)(nil)))
}
createdDate, err := time.Parse(dateLayout, str)
if err != nil {
panic("Error parsing date " + str + "; expecting format " + dateLayout)
}
return reflect.ValueOf(&ionoscloud.IonosTime{Time: createdDate})
},
},
{
From: "*IonosTime",
To: "string",
Cast: func(value reflect.Value) reflect.Value {
t := value.Interface().(*ionoscloud.IonosTime)
return reflect.ValueOf(t.Format(dateLayout))
},
},
{
From: "*int32",
To: "int",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(*int32)
if v == nil {
return reflect.ValueOf(0)
}
return reflect.ValueOf(int(*v))
},
},
{
From: "int",
To: "*int32",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(int)
if v == 0 {
return reflect.Zero(reflect.TypeOf((*int32)(nil)))
}
vInt32 := int32(v)
return reflect.ValueOf(&vInt32)
},
},
{
From: "*float32",
To: "int",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(*float32)
if v == nil {
return reflect.ValueOf(0)
}
return reflect.ValueOf(int(*v))
},
},
{
From: "int",
To: "*float32",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(int)
if v == 0 {
return reflect.Zero(reflect.TypeOf((*float32)(nil)))
}
vFloat32 := float32(v)
return reflect.ValueOf(&vFloat32)
},
},
{
From: "string",
To: "*string",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(string)
if v == "" {
return reflect.Zero(reflect.TypeOf((*string)(nil)))
}
newV := v
return reflect.ValueOf(&newV)
},
},
{
From: "int32",
To: "*int32",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(int32)
if v == 0 {
return reflect.Zero(reflect.TypeOf((*int32)(nil)))
}
return reflect.ValueOf(&v)
},
},
{
From: "int64",
To: "*int64",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(int64)
if v == 0 {
return reflect.Zero(reflect.TypeOf((*int64)(nil)))
}
return reflect.ValueOf(&v)
},
},
{
From: "int",
To: "*int",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(int)
if v == 0 {
return reflect.Zero(reflect.TypeOf((*int)(nil)))
}
return reflect.ValueOf(&v)
},
},
{
From: "*int32",
To: "*int",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(*int32)
if v == nil {
return reflect.Zero(reflect.TypeOf((*int)(nil)))
}
vInt := int(*v)
return reflect.ValueOf(&vInt)
},
},
{
From: "*int",
To: "*int32",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(*int)
if v == nil {
return reflect.Zero(reflect.TypeOf((*int32)(nil)))
}
vInt32 := int32(*v)
return reflect.ValueOf(&vInt32)
},
},
{
From: "*float32",
To: "float64",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(*float32)
if v == nil {
return reflect.ValueOf(0)
}
vFloat64 := float64(*v)
return reflect.ValueOf(vFloat64)
},
},
{
From: "float64",
To: "*float32",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(float64)
if v == 0 {
return reflect.Zero(reflect.TypeOf((*float32)(nil)))
}
vFloat32 := float32(v)
return reflect.ValueOf(&vFloat32)
},
},
{
From: "*Time",
To: "Time",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(*time.Time)
return reflect.ValueOf(*v)
},
},
{
From: "Time",
To: "*Time",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(time.Time)
return reflect.ValueOf(&v)
},
},
{
From: "*IonosTime",
To: "Time",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(*ionoscloud.IonosTime)
return reflect.ValueOf(v.Time)
},
},
{
From: "Time",
To: "*IonosTime",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(time.Time)
return reflect.ValueOf(&ionoscloud.IonosTime{Time: v})
},
},
{
From: "Time",
To: "Time",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(time.Time)
return reflect.ValueOf(v)
},
},
{
From: "*map[string]string",
To: "interface {}",
Cast: func(value reflect.Value) reflect.Value {
ret := map[string]string{}
mapValue := value.Elem()
for _, k := range mapValue.MapKeys() {
v := mapValue.MapIndex(k)
key := k.Interface().(string)
switch t := v.Interface().(type) {
case string:
ret[key] = t
default:
/* todo: warn about non string values */
}
}
return reflect.ValueOf(ret)
},
},
{
From: "*int32",
To: "uint32",
Cast: func(value reflect.Value) reflect.Value {
v := value.Interface().(*int32)
if *v == 0 {
return reflect.ValueOf(0)
}
return reflect.ValueOf(uint32(*v))
},
},
}
/* fieldMap is always compat -> core */
func convert(from reflect.Value, to reflect.Value, fieldMap map[string]string) error {
fromType := from.Type()
toType := to.Type()
/* jumping through pointers */
fromDeepType := getTypeFromPtr(fromType)
toDeepType := getTypeFromPtr(toType)
if caster := findCustomCaster(from, to); caster != nil {
/* custom caster found, apply it */
/* intentionally avoiding to use setReflectValue here since Cast controls the returned pointer if any and
* might return nil */
to.Set(caster.Cast(from))
return nil
}
/* check nulls */
if fromType.Kind() == reflect.Ptr && from.IsNil() && toType.Kind() == reflect.Ptr {
to.Set(reflect.Zero(toType))
return nil
}
switch {
case isPrimitiveType(toDeepType.Kind()):
if !isPrimitiveType(fromDeepType.Kind()) {
return errors.New(fmt.Sprintf(
"[convert] to is primitive %s but from is not primitive (%s)",
getTypeName(toType), getTypeName(fromType)))
}
if err := setPrimitiveFields(from, to); err != nil {
return err
}
case toDeepType.Kind() == reflect.Struct:
if fromDeepType.Kind() != reflect.Struct {
return errors.New(fmt.Sprintf("[convert] from is %s and to is %s",
getTypeName(from.Type()), getTypeName(to.Type())))
}
for i := 0; i < toDeepType.NumField(); i++ {
toField := toDeepType.Field(i)
toFieldName := toField.Name
toFieldValue := getFieldByName(to, toFieldName)
fromFieldName := getFieldMapping(fieldMap, toFieldName)
if _, ok := fromDeepType.FieldByName(fromFieldName); !ok {
if fromFieldName != toFieldName {
fromFieldName = toFieldName
/* fall back to the original name */
if _, ok := fromDeepType.FieldByName(fromFieldName); !ok {
/* 'to' field not found in 'from'; might happen if core has new fields added that compat doesn't
* know about; todo: log it */
continue
}
} else {
continue
}
}
fromFieldValue := getFieldByName(from, fromFieldName)
if fromFieldValue.Type().Kind() == reflect.Ptr && fromFieldValue.IsNil() {
/* skip nil */
continue
}
if toField.Type.Kind() == reflect.Ptr {
toFieldValue.Set(reflect.New(toField.Type.Elem()))
}
if err := convert(fromFieldValue, toFieldValue, fieldMap); err != nil {
return err
}
}
case toDeepType.Kind() == reflect.Slice:
if fromDeepType.Kind() != reflect.Slice {
return errors.New(fmt.Sprintf("[convert] cannot convert %s to %s",
getTypeName(fromType), getTypeName(toType)))
}
/* make the slice */
fromLen := getSliceLen(from)
/* if from is empty and to is a pointer, leave to nil */
if fromLen == 0 && toType.Kind() == reflect.Ptr {
to.Set(reflect.Zero(toType))
return nil
}
setReflectValue(to, reflect.MakeSlice(toDeepType, fromLen, fromLen*2))
/* convert every element */
for i := 0; i < fromLen; i++ {
fromElement := getSliceElement(from, i)
toElement := getSliceElement(to, i)
if fromElement.Type().Kind() == reflect.Ptr && fromElement.IsNil() {
/* skip nils */
continue
}
if toElement.Type().Kind() == reflect.Ptr {
/* malloc here */
toElement.Set(reflect.New(toElement.Type().Elem()))
}
if err := convert(fromElement, toElement, fieldMap); err != nil {
return err
}
}
default:
fromTypeName := getTypeName(fromType)
fmt.Println(fromTypeName)
return errors.New(fmt.Sprintf("[convert] conversion to %s not implemented", getTypeName(toType)))
}
return nil
}
func convertToCore(from interface{}, to interface{}) error {
fromValue := reflect.ValueOf(from)
toValue := reflect.ValueOf(to)
if fromValue.Type().Kind() != reflect.Ptr {
return errors.New("[convertToCore] from is not a pointer")
}
if toValue.Type().Kind() != reflect.Ptr {
return errors.New("[convertToCore] to is not a pointer")
}
return convert(fromValue, toValue, revertMap(CompatCoreFieldMap))
}
func convertToCompat(from interface{}, to interface{}) error {
fromValue := reflect.ValueOf(from)
toValue := reflect.ValueOf(to)
if fromValue.Type().Kind() != reflect.Ptr {
return errors.New("[convertToCompat] from is not a pointer")
}
if toValue.Type().Kind() != reflect.Ptr {
return errors.New("[convertToCompat] to is not a pointer")
}
return convert(fromValue, toValue, CompatCoreFieldMap)
}
func setReflectValue(v reflect.Value, value reflect.Value) {
if v.Type().Kind() == reflect.Ptr {
v.Set(reflect.New(v.Elem().Type()))
v.Elem().Set(value)
} else {
v.Set(value)
}
}
func setPrimitiveFields(from reflect.Value, to reflect.Value) error {
if getTypeFromPtr(from.Type()) != getTypeFromPtr(to.Type()) {
return errors.New(
fmt.Sprintf(
"[convert] primitives from and to are not of the same type: %s and %s",
getTypeName(from.Type()), getTypeName(to.Type())))
}
if from.Type().Kind() == reflect.Ptr {
if to.Type().Kind() == reflect.Ptr {
/* pointer to pointer */
to.Set(from)
} else {
/* dereference from */
to.Set(from.Elem())
}
} else {
if to.Type().Kind() == reflect.Ptr {
/* allocate and set */
to.Set(reflect.New(to.Type().Elem()))
to.Elem().Set(from)
} else {
to.Set(from)
}
}
return nil
}
func isPrimitiveType(t reflect.Kind) bool {
for _, e := range primitiveTypes {
if t == e {
return true
}
}
return false
}
func getTypeFromPtr(t reflect.Type) reflect.Type {
if t.Kind() == reflect.Ptr {
return t.Elem()
}
return t
}
/* todo */
func getFieldMapping(fieldMap map[string]string, field string) string {
for k, v := range fieldMap {
if k == field {
return v
}
}
return field
}
func revertMap(fieldMap map[string]string) map[string]string {
ret := map[string]string{}
for k, v := range fieldMap {
ret[v] = k
}
return ret
}
func getTypeName(t reflect.Type) string {
switch t.Kind() {
case reflect.Ptr:
return "*" + getTypeName(t.Elem())
case reflect.Slice, reflect.Array:
return "[]" + getTypeName(t.Elem())
default:
if t.Name() == "" {
return t.String()
} else {
return t.Name()
}
}
}
/* note: assuming t is slice or ptr to slice */
func getSliceLen(t reflect.Value) int {
if t.Type().Kind() == reflect.Ptr {
return t.Elem().Len()
} else {
return t.Len()
}
}
func getSliceElement(slice reflect.Value, i int) reflect.Value {
if slice.Type().Kind() == reflect.Ptr {
return slice.Elem().Index(i)
} else {
return slice.Index(i)
}
}
func getFieldByName(s reflect.Value, f string) reflect.Value {
if s.Type().Kind() == reflect.Ptr {
return s.Elem().FieldByName(f)
} else {
return s.FieldByName(f)
}
}
func findCustomCaster(from reflect.Value, to reflect.Value) *CustomCaster {
for _, caster := range CustomCasters {
if caster.From == getTypeName(from.Type()) && caster.To == getTypeName(to.Type()) {
return &caster
}
}
return nil
}