generated from hashicorp/terraform-provider-scaffolding
/
reflect.go
381 lines (336 loc) · 9.89 KB
/
reflect.go
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package provider
import (
"fmt"
"reflect"
"strings"
"github.com/hashicorp/terraform-plugin-framework/attr"
"github.com/hashicorp/terraform-plugin-framework/diag"
"github.com/hashicorp/terraform-plugin-framework/types/basetypes"
)
func generateType(v any) (attr.Type, error) {
return generateTypeReflect(reflect.TypeOf(v))
}
func generateTypeReflect(t reflect.Type) (attr.Type, error) {
switch t.Kind() {
case reflect.String:
return basetypes.StringType{}, nil
case reflect.Bool:
return basetypes.BoolType{}, nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32:
return basetypes.Int64Type{}, nil
case reflect.Float32, reflect.Float64:
return basetypes.Float64Type{}, nil
case reflect.Array, reflect.Slice:
st, err := generateTypeReflect(t.Elem())
if err != nil {
return nil, fmt.Errorf("[]%v: %w", t.Elem(), err)
}
return basetypes.ListType{
ElemType: st,
}, nil
case reflect.Map:
if t.Key().Kind() != reflect.String {
return nil, fmt.Errorf("%v only string map keys are supported", t.Key())
}
et, err := generateTypeReflect(t.Elem())
if err != nil {
return nil, fmt.Errorf("map[string]%v: %w", t.Elem(), err)
}
return basetypes.MapType{
ElemType: et,
}, nil
case reflect.Struct:
ot := basetypes.ObjectType{
AttrTypes: make(map[string]attr.Type, t.NumField()),
}
for i := 0; i < t.NumField(); i++ {
sf := t.Field(i)
tag := yamlName(sf)
if tag == nil {
continue
}
ft, err := generateTypeReflect(sf.Type)
if err != nil {
return nil, fmt.Errorf("struct %w", err)
}
ot.AttrTypes[*tag] = ft
}
return ot, nil
default:
return nil, fmt.Errorf("unknown type encountered: %v", t.Kind())
}
}
func generateValue(v any) (attr.Value, diag.Diagnostics) {
return generateValueReflect(reflect.ValueOf(v))
}
func generateValueReflect(v reflect.Value) (attr.Value, diag.Diagnostics) {
t := v.Type()
switch t.Kind() {
case reflect.Pointer:
return generateValueReflect(v.Elem())
case reflect.String:
return basetypes.NewStringValue(v.String()), nil
case reflect.Bool:
return basetypes.NewBoolValue(v.Bool()), nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return basetypes.NewInt64Value(v.Int()), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32:
return basetypes.NewInt64Value(int64(v.Uint())), nil
case reflect.Float32, reflect.Float64:
return basetypes.NewFloat64Value(v.Float()), nil
case reflect.Array, reflect.Slice:
st, err := generateTypeReflect(t.Elem())
if err != nil {
return nil, []diag.Diagnostic{diag.NewErrorDiagnostic(err.Error(), "")}
}
ets := make([]attr.Value, 0, v.Len())
for i := 0; i < v.Len(); i++ {
et, diags := generateValueReflect(v.Index(i))
if diags.HasError() {
return nil, diags
}
ets = append(ets, et)
}
return basetypes.NewListValue(st, ets)
case reflect.Map:
et, err := generateTypeReflect(t.Elem())
if err != nil {
return nil, []diag.Diagnostic{diag.NewErrorDiagnostic(err.Error(), "")}
}
em := make(map[string]attr.Value, v.Len())
for _, key := range v.MapKeys() {
et, diags := generateValueReflect(v.MapIndex(key))
if diags.HasError() {
return nil, diags
}
em[key.String()] = et
}
return basetypes.NewMapValue(et, em)
case reflect.Struct:
ot, err := generateTypeReflect(t)
if err != nil {
return nil, []diag.Diagnostic{diag.NewErrorDiagnostic(err.Error(), "")}
}
fv := make(map[string]attr.Value, t.NumField())
for i := 0; i < t.NumField(); i++ {
sf := t.Field(i)
tag := yamlName(sf)
if tag == nil {
continue
}
ft, diags := generateValueReflect(v.Field(i))
if diags.HasError() {
return nil, diags
}
fv[*tag] = ft
}
return basetypes.NewObjectValue(ot.(basetypes.ObjectType).AttrTypes, fv)
default:
return nil, []diag.Diagnostic{diag.NewErrorDiagnostic("unknown type", t.Kind().String())}
}
}
func assignValue(in attr.Value, out any) diag.Diagnostics {
rv := reflect.ValueOf(out)
if rv.Kind() != reflect.Pointer || rv.IsNil() {
return []diag.Diagnostic{diag.NewErrorDiagnostic("not a pointer or nil", fmt.Sprintf("got: %T", out))}
}
// This is copied from encoding/json
if rv.Kind() != reflect.Pointer && rv.Type().Name() != "" && rv.CanAddr() {
rv = rv.Addr()
}
return assignValueReflect(in, rv)
}
func assignValueReflect(in attr.Value, out reflect.Value) diag.Diagnostics {
t := out.Type()
switch t.Kind() {
case reflect.Pointer:
return assignValueReflect(in, out.Elem())
case reflect.String:
sv, ok := in.(basetypes.StringValue)
if !ok {
return []diag.Diagnostic{diag.NewErrorDiagnostic("not a string", fmt.Sprintf("got: %T", in))}
}
out.SetString(sv.ValueString())
return nil
case reflect.Bool:
bv, ok := in.(basetypes.BoolValue)
if !ok {
return []diag.Diagnostic{diag.NewErrorDiagnostic("not a bool", fmt.Sprintf("got: %T", in))}
}
out.SetBool(bv.ValueBool())
return nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
iv, ok := in.(basetypes.Int64Value)
if !ok {
return []diag.Diagnostic{diag.NewErrorDiagnostic("not an int64", fmt.Sprintf("got: %T", in))}
}
out.SetInt(iv.ValueInt64())
return nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32:
iv, ok := in.(basetypes.Int64Value)
if !ok {
return []diag.Diagnostic{diag.NewErrorDiagnostic("not an int64", fmt.Sprintf("got: %T", in))}
}
out.SetUint(uint64(iv.ValueInt64()))
return nil
case reflect.Float32, reflect.Float64:
fv, ok := in.(basetypes.Float64Value)
if !ok {
return []diag.Diagnostic{diag.NewErrorDiagnostic("not a float", fmt.Sprintf("got: %T", in))}
}
out.SetFloat(fv.ValueFloat64())
return nil
case reflect.Slice:
lv, ok := in.(basetypes.ListValue)
if !ok {
return []diag.Diagnostic{diag.NewErrorDiagnostic("not a list", fmt.Sprintf("got: %T", in))}
}
elts := lv.Elements()
out = indirect(out)
t = out.Type()
// Set the slice capacity appropriately (based on encoding/json)
l := len(elts)
if l > out.Cap() {
newv := reflect.MakeSlice(t, out.Len(), l)
reflect.Copy(newv, out)
out.Set(newv)
}
if l >= out.Len() {
out.SetLen(l)
}
// Copy into each of the elements.
for i, elt := range elts {
if diags := assignValueReflect(elt, out.Index(i)); diags.HasError() {
return diags
}
}
return nil
case reflect.Map:
mv, ok := in.(basetypes.MapValue)
if !ok {
return []diag.Diagnostic{diag.NewErrorDiagnostic("not a map", fmt.Sprintf("got: %T", in))}
}
elts := mv.Elements()
out = indirect(out)
t = out.Type()
if out.IsNil() {
out.Set(reflect.MakeMap(t))
}
for key, val := range elts {
k := reflect.ValueOf(key)
v := reflect.New(t.Elem()).Elem()
if diags := assignValueReflect(val, v); diags.HasError() {
return diags
}
out.SetMapIndex(k, v)
}
return nil
case reflect.Struct:
ov, ok := in.(basetypes.ObjectValue)
if !ok {
return []diag.Diagnostic{diag.NewErrorDiagnostic("not a object", fmt.Sprintf("got: %T", in))}
}
fl := ov.Attributes()
out = indirect(out)
t = out.Type()
for i := 0; i < t.NumField(); i++ {
sf := t.Field(i)
tag := yamlName(sf)
if tag == nil {
continue
}
val, ok := fl[*tag]
if !ok {
continue
}
diags := assignValueReflect(val, out.Field(i))
if diags.HasError() {
return diags
}
delete(fl, *tag)
}
diags := make([]diag.Diagnostic, 0, len(fl))
for k := range fl {
diags = append(diags, diag.NewErrorDiagnostic("unmatched field", fmt.Sprintf("%s was not found in struct", k)))
}
return diags
default:
return []diag.Diagnostic{diag.NewErrorDiagnostic("unknown type", t.Kind().String())}
}
}
func yamlName(field reflect.StructField) *string {
tag := field.Tag.Get("yaml")
if tag == "" && !strings.Contains(string(field.Tag), ":") {
tag = string(field.Tag)
}
if tag == "-" {
return nil
}
fields := strings.Split(tag, ",")
if fields[0] != "" {
return &fields[0]
}
fn := strings.ToLower(field.Name)
return &fn
}
// indirect walks down v allocating pointers as needed,
// until it gets to a non-pointer.
// If it encounters an Unmarshaler, indirect stops and returns that.
// If decodingNull is true, indirect stops at the first settable pointer so it
// can be set to nil.
// This is copied/modified from encoding/json
func indirect(v reflect.Value) reflect.Value {
// Issue #24153 indicates that it is generally not a guaranteed property
// that you may round-trip a reflect.Value by calling Value.Addr().Elem()
// and expect the value to still be settable for values derived from
// unexported embedded struct fields.
//
// The logic below effectively does this when it first addresses the value
// (to satisfy possible pointer methods) and continues to dereference
// subsequent pointers as necessary.
//
// After the first round-trip, we set v back to the original value to
// preserve the original RW flags contained in reflect.Value.
v0 := v
haveAddr := false
// If v is a named type and is addressable,
// start with its address, so that if the type has pointer methods,
// we find them.
if v.Kind() != reflect.Pointer && v.Type().Name() != "" && v.CanAddr() {
haveAddr = true
v = v.Addr()
}
for {
// Load value from interface, but only if the result will be
// usefully addressable.
if v.Kind() == reflect.Interface && !v.IsNil() {
e := v.Elem()
if e.Kind() == reflect.Pointer && !e.IsNil() {
haveAddr = false
v = e
continue
}
}
if v.Kind() != reflect.Pointer {
break
}
// Prevent infinite loop if v is an interface pointing to its own address:
// var v interface{}
// v = &v
if v.Elem().Kind() == reflect.Interface && v.Elem().Elem() == v {
v = v.Elem()
break
}
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
if haveAddr {
v = v0 // restore original value after round-trip Value.Addr().Elem()
haveAddr = false
} else {
v = v.Elem()
}
}
return v
}