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Add support of polymorphic struct in reflect lib
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Signed-off-by: Shawn Wang <shawn.wang@broadcom.com>
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@wsquan171
wsquan171 committed Jun 10, 2024
1 parent d56363d commit f3035e5
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Showing 2 changed files with 740 additions and 1 deletion.
215 changes: 214 additions & 1 deletion nsxt/metadata/metadata.go
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,8 @@ import (
"github.com/vmware/terraform-provider-nsxt/nsxt/util"

"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
vapiBindings_ "github.com/vmware/vsphere-automation-sdk-go/runtime/bindings"
"github.com/vmware/vsphere-automation-sdk-go/runtime/data"
)

// package level logger to include log.Lshortfile context
Expand All @@ -21,7 +23,13 @@ type Metadata struct {
ReadOnly bool
SdkFieldName string
// This attribute is parent path for the object
IsParentPath bool
IsParentPath bool
// This attribute is polymorphic
IsPolymorphic bool
// SDK vapi binding type for converting polymorphic structs
BindingType vapiBindings_.BindingType
// Map from schema key of polymorphic attr to this SDK resource type
ResourceTypeMap map[string]string
IntroducedInVersion string
// skip handling of this attribute - it will be done manually
Skip bool
Expand Down Expand Up @@ -121,6 +129,22 @@ func StructToSchema(elem reflect.Value, d *schema.ResourceData, metadata map[str
logger.Printf("[TRACE] %s skip key %s with nil value", ctx, key)
continue
}
if item.Metadata.IsPolymorphic {
childElem := elem.FieldByName(item.Metadata.SdkFieldName)
var nestedVal interface{}
nestedVal, err = polyStructToSchema(ctx, childElem, item)
if err != nil {
return
}

if len(parent) > 0 {
parentMap[key] = nestedVal
} else {
d.Set(key, nestedVal)
}
logger.Printf("[TRACE] %s adding polymorphic slice %+v to key %s", ctx, nestedVal, key)
continue
}
if item.Metadata.SchemaType == "struct" {
nestedObj := elem.FieldByName(item.Metadata.SdkFieldName)
nestedSchema := make(map[string]interface{})
Expand Down Expand Up @@ -217,6 +241,26 @@ func SchemaToStruct(elem reflect.Value, d *schema.ResourceData, metadata map[str
if len(parent) > 0 {
logger.Printf("[TRACE] %s parent %s key %s", ctx, parent, key)
}
if item.Metadata.IsPolymorphic {
var itemList []interface{}
if item.Metadata.SchemaType == "list" || item.Metadata.SchemaType == "struct" {
if len(parent) > 0 {
itemList = parentMap[key].([]interface{})
} else {
itemList = d.Get(key).([]interface{})
}
} else {
if len(parent) > 0 {
itemList = parentMap[key].(*schema.Set).List()
} else {
itemList = d.Get(key).(*schema.Set).List()
}
}
if err = polySchemaToStruct(ctx, elem, itemList, item); err != nil {
return
}
continue
}
if item.Metadata.SchemaType == "string" {
var value string
if len(parent) > 0 {
Expand Down Expand Up @@ -328,3 +372,172 @@ func SchemaToStruct(elem reflect.Value, d *schema.ResourceData, metadata map[str

return
}

func polyStructToSchema(ctx string, elem reflect.Value, item *ExtendedSchema) (ret []map[string]interface{}, err error) {
if !item.Metadata.IsPolymorphic {
err = fmt.Errorf("%s polyStructToSchema called on non-polymorphic attr", ctx)
logger.Printf("[ERROR] %v", err)
return
}

elemSlice := elem
if item.Metadata.SchemaType == "struct" {
if elem.IsNil() {
return
}
// convert to slice to share logic with list and set
elemSlice = reflect.MakeSlice(reflect.SliceOf(elem.Type()), 1, 1)
elemSlice.Index(0).Set(elem)
} else if item.Metadata.SchemaType != "list" && item.Metadata.SchemaType != "set" {
err = fmt.Errorf("%s unsupported polymorphic schema type %s", ctx, item.Metadata.SchemaType)
logger.Printf("[ERROR] %v", err)
return
}
if elemSlice.Len() == 0 {
return
}

converter := vapiBindings_.NewTypeConverter()
sliceValue := make([]map[string]interface{}, elemSlice.Len())
for i := 0; i < elemSlice.Len(); i++ {
childElem := elemSlice.Index(i).Elem().Interface().(data.StructValue)
nestedSchema := make(map[string]interface{})
var key, rType string
var childExtSch *ExtendedSchema

// Get resource type from SDK object
if !childElem.HasField("resource_type") {
err = fmt.Errorf("%s polyStructToSchema failed to get resource type for %s",
ctx, item.Metadata.SdkFieldName)
logger.Printf("[ERROR] %v", err)
return
}
var rTypeData data.DataValue
rTypeData, err = childElem.Field("resource_type")
if err != nil {
return
}
if strVal, ok := rTypeData.(*data.StringValue); ok {
rType = strVal.Value()
} else if opVal, ok := rTypeData.(*data.OptionalValue); ok {
rType, err = opVal.String()
if err != nil {
return
}
} else {
err = fmt.Errorf("%s polyStructToSchema failed to get resource type for %s",
ctx, item.Metadata.SdkFieldName)
logger.Printf("[ERROR] %v", err)
return
}

// Get metadata for the corresponding type
for k, v := range item.Metadata.ResourceTypeMap {
if v == rType {
key = k
childExtSch = item.Schema.Elem.(*ExtendedResource).Schema[k]
break
}
}
if len(key) == 0 || childExtSch == nil {
err = fmt.Errorf("%s polyStructToSchema failed to get schema meta of type %s for %s",
ctx, rType, item.Metadata.SdkFieldName)
logger.Printf("[ERROR] %v", err)
return
}

// Convert to concrete struct
dv, errors := converter.ConvertToGolang(&childElem, childExtSch.Metadata.BindingType)
if errors != nil {
err = errors[0]
logger.Printf("[ERROR] %v", err)
return
}

if err = StructToSchema(reflect.ValueOf(dv), nil, childExtSch.Schema.Elem.(*ExtendedResource).Schema, key, nestedSchema); err != nil {
return
}
sliceValue[i] = make(map[string]interface{})
sliceValue[i][key] = []interface{}{nestedSchema}
logger.Printf("[TRACE] %s adding %+v of key %s", ctx, dv, key)
}

ret = sliceValue
return
}

func polySchemaToStruct(ctx string, elem reflect.Value, dataList []interface{}, item *ExtendedSchema) (err error) {
if !item.Metadata.IsPolymorphic {
err = fmt.Errorf("%s polySchemaToStruct called on non-polymorphic attr", ctx)
logger.Printf("[ERROR] %v", err)
return
}

childElem, ok := item.Schema.Elem.(*ExtendedResource)
if !ok {
err = fmt.Errorf("%s polymorphic attr has non-ExtendedResource element", ctx)
logger.Printf("[ERROR] %v", err)
return
}

converter := vapiBindings_.NewTypeConverter()
dv := make([]*data.StructValue, len(dataList))
for i, dataElem := range dataList {
dataMap := dataElem.(map[string]interface{})
for k, v := range dataMap {
if len(v.([]interface{})) == 0 {
continue
}
rType, ok := item.Metadata.ResourceTypeMap[k]
if !ok {
err = fmt.Errorf("%s polymorphic attr has key %s not found in resource type map", ctx, k)
logger.Printf("[ERROR] %v", err)
return
}
if _, ok := childElem.Schema[k]; !ok {
err = fmt.Errorf("%s polymorphic attr has key %s not found in metadata", ctx, k)
logger.Printf("[ERROR] %v", err)
return
}

childMeta := childElem.Schema[k]
nestedObj := reflect.New(childMeta.Metadata.ReflectType)
nestedSchema := v.([]interface{})[0].(map[string]interface{})
if err = SchemaToStruct(nestedObj.Elem(), nil, childMeta.Schema.Elem.(*ExtendedResource).Schema, k, nestedSchema); err != nil {
return
}
// set resource type based on mapping
nestedObj.Elem().FieldByName("ResourceType").Set(reflect.ValueOf(&rType))

dataValue, errors := converter.ConvertToVapi(nestedObj.Interface(), childMeta.Metadata.BindingType)
if errors != nil {
err = errors[0]
logger.Printf("[ERROR] %v", err)
return
}
dv[i] = dataValue.(*data.StructValue)
logger.Printf("[TRACE] %s adding polymorphic value %+v to %s",
ctx, nestedObj.Interface(), item.Metadata.SdkFieldName)

// there should be only one non-empty entry in the map
break
}
}

if item.Metadata.SchemaType == "struct" {
elem.FieldByName(item.Metadata.SdkFieldName).Set(reflect.ValueOf(dv[0]))
} else if item.Metadata.SchemaType == "list" || item.Metadata.SchemaType == "set" {
sliceElem := elem.FieldByName(item.Metadata.SdkFieldName)
sliceElem.Set(
reflect.MakeSlice(reflect.SliceOf(reflect.TypeOf(&data.StructValue{})), len(dv), len(dv)))
for i, v := range dv {
sliceElem.Index(i).Set(reflect.ValueOf(v))
}
} else {
err = fmt.Errorf("%s unsupported polymorphic schema type %s", ctx, item.Metadata.SchemaType)
logger.Printf("[ERROR] %v", err)
return
}

return
}
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