fix(amino/json): use AminoMarshaler reprType info

When a type is registered, if it implements AminoMarshaler, then use the type
returned by `MarshalAmino` method to feed type `ConcreteInfo`.

This prevents a panics that happens during the sanity check phase of
`encodeReflectJSONInterface` when the type `ConcreteInfo` doesn't match
the JSON structure. For instance, that used to happen with `BigintValue`
which is a struct (so expected JSON is `{...}`), but is marshaled into a
simple string (so expected JSON is only `"..."`).

gnovm/pkg/gnolang/package_test.go

@@ -0,0 +1,27 @@
+package gnolang
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/jaekwon/testify/require"
+
+	"github.com/gnolang/gno/tm2/pkg/amino"
+)
+
+// Tries to reproduce the bug #1036 on all registered types
+func TestMarshalAminoRegisteredTypes(t *testing.T) {
+	for _, typ := range Package.Types {
+		// Instanciate registered type
+		x := reflect.New(typ.Type).Interface()
+		// Call MarshalAmino directly on 'x'
+		_, err := amino.MarshalJSON(x)
+		require.NoError(t, err, "marshal type %s", typ.Type.Name())
+		// Call MarshalAmino on a struct that embeds 'x' in a field of type any
+		xx := struct {
+			X any
+		}{X: x}
+		_, err = amino.MarshalJSON(xx)
+		require.NoError(t, err, "marshal type %s from struct", typ.Type.Name())
+	}
+}

tm2/pkg/amino/codec.go

@@ -634,13 +634,16 @@ func (cdc *Codec) newTypeInfoUnregisteredWLocked(rt reflect.Type) *TypeInfo {
 			panic(err)
 		}
 		info.ConcreteInfo.ReprType = rinfo
+		info.ConcreteInfo.IsJSONWellKnownType = rinfo.IsJSONWellKnownType
+		info.ConcreteInfo.IsJSONAnyValueType = rinfo.IsJSONAnyValueType
+		info.ConcreteInfo.IsBinaryWellKnownType = rinfo.IsBinaryWellKnownType
 	} else {
 		info.ConcreteInfo.IsAminoMarshaler = false
 		info.ConcreteInfo.ReprType = info
+		info.ConcreteInfo.IsJSONWellKnownType = isJSONWellKnownType(rt)
+		info.ConcreteInfo.IsJSONAnyValueType = isJSONAnyValueType(rt)
+		info.ConcreteInfo.IsBinaryWellKnownType = isBinaryWellKnownType(rt)
 	}
-	info.ConcreteInfo.IsBinaryWellKnownType = isBinaryWellKnownType(rt)
-	info.ConcreteInfo.IsJSONWellKnownType = isJSONWellKnownType(rt)
-	info.ConcreteInfo.IsJSONAnyValueType = isJSONAnyValueType(rt)
 	if rt.Kind() == reflect.Array || rt.Kind() == reflect.Slice {
 		einfo, err := cdc.getTypeInfoWLocked(rt.Elem())
 		if err != nil {

tm2/pkg/amino/json_encode.go

@@ -397,24 +397,6 @@ func isJSONAnyValueType(rt reflect.Type) bool {
 		// {@type,value}, the latter specifically
 		// {@type:"/google.protobuf.Any",value:{@type,value}).
 		return true
-	} else {
-		// Otherwise, it depends on the kind.
-		switch rt.Kind() {
-		case
-			reflect.Bool, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32,
-			reflect.Int64, reflect.Uint, reflect.Uint8, reflect.Uint16,
-			reflect.Uint32, reflect.Uint64, reflect.Float32, reflect.Float64,
-			// Primitive types get special {@type,value} treatment.  In
-			// binary form, most of these types would be encoded
-			// wrapped in an implicit struct, except for lists (both of
-			// bytes and of anything else), and for strings...
-			reflect.Array, reflect.Slice, reflect.String:
-			// ...which are all non-objects that must be encoded as
-			// {@type,value}.
-			return true
-		default:
-			return false
-		}
-		return false
 	}
+	return false
 }