Reflect Marshaler

abi/dynamic/reflect_marshal.go

@@ -0,0 +1,170 @@
+// Copyright (C) 2024, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package dynamic
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"reflect"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/ava-labs/avalanchego/utils/wrappers"
+	"golang.org/x/text/cases"
+	"golang.org/x/text/language"
+
+	"github.com/ava-labs/hypersdk/abi"
+	"github.com/ava-labs/hypersdk/codec"
+	"github.com/ava-labs/hypersdk/consts"
+)
+
+var ErrTypeNotFound = errors.New("type not found in ABI")
+
+func Marshal(inputABI abi.ABI, typeName string, jsonData string) ([]byte, error) {
+	if _, ok := findABIType(inputABI, typeName); !ok {
+		return nil, fmt.Errorf("marshalling %s: %w", typeName, ErrTypeNotFound)
+	}
+
+	typeCache := make(map[string]reflect.Type)
+
+	typ, err := getReflectType(typeName, inputABI, typeCache)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get reflect type: %w", err)
+	}
+
+	value := reflect.New(typ).Interface()
+
+	if err := json.Unmarshal([]byte(jsonData), value); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal JSON data: %w", err)
+	}
+
+	writer := codec.NewWriter(0, consts.NetworkSizeLimit)
+	if err := codec.LinearCodec.MarshalInto(value, writer.Packer); err != nil {
+		return nil, fmt.Errorf("failed to marshal struct: %w", err)
+	}
+
+	return writer.Bytes(), nil
+}
+
+func Unmarshal(inputABI abi.ABI, typeName string, data []byte) (string, error) {
+	if _, ok := findABIType(inputABI, typeName); !ok {
+		return "", fmt.Errorf("unmarshalling %s: %w", typeName, ErrTypeNotFound)
+	}
+
+	typeCache := make(map[string]reflect.Type)
+
+	typ, err := getReflectType(typeName, inputABI, typeCache)
+	if err != nil {
+		return "", fmt.Errorf("failed to get reflect type: %w", err)
+	}
+
+	value := reflect.New(typ).Interface()
+
+	packer := wrappers.Packer{
+		Bytes:   data,
+		MaxSize: consts.NetworkSizeLimit,
+	}
+	if err := codec.LinearCodec.UnmarshalFrom(&packer, value); err != nil {
+		return "", fmt.Errorf("failed to unmarshal data: %w", err)
+	}
+
+	jsonData, err := json.Marshal(value)
+	if err != nil {
+		return "", fmt.Errorf("failed to marshal struct to JSON: %w", err)
+	}
+
+	return string(jsonData), nil
+}
+
+// Matches fixed-size arrays like [32]uint8
+var fixedSizeArrayRegex = regexp.MustCompile(`^\[(\d+)\](.+)$`)
+
+func getReflectType(abiTypeName string, inputABI abi.ABI, typeCache map[string]reflect.Type) (reflect.Type, error) {
+	switch abiTypeName {
+	case "string":
+		return reflect.TypeOf(""), nil
+	case "uint8":
+		return reflect.TypeOf(uint8(0)), nil
+	case "uint16":
+		return reflect.TypeOf(uint16(0)), nil
+	case "uint32":
+		return reflect.TypeOf(uint32(0)), nil
+	case "uint64":
+		return reflect.TypeOf(uint64(0)), nil
+	case "int8":
+		return reflect.TypeOf(int8(0)), nil
+	case "int16":
+		return reflect.TypeOf(int16(0)), nil
+	case "int32":
+		return reflect.TypeOf(int32(0)), nil
+	case "int64":
+		return reflect.TypeOf(int64(0)), nil
+	case "Address":
+		return reflect.TypeOf(codec.Address{}), nil
+	default:
+		// golang slices
+		if strings.HasPrefix(abiTypeName, "[]") {
+			elemType, err := getReflectType(strings.TrimPrefix(abiTypeName, "[]"), inputABI, typeCache)
+			if err != nil {
+				return nil, err
+			}
+			return reflect.SliceOf(elemType), nil
+		}
+
+		// golang arrays
+
+		if match := fixedSizeArrayRegex.FindStringSubmatch(abiTypeName); match != nil {
+			sizeStr := match[1]
+			size, err := strconv.Atoi(sizeStr)
+			if err != nil {
+				return nil, fmt.Errorf("failed to convert size to int: %w", err)
+			}
+			elemType, err := getReflectType(match[2], inputABI, typeCache)
+			if err != nil {
+				return nil, err
+			}
+			return reflect.ArrayOf(size, elemType), nil
+		}
+
+		// For custom types, recursively construct the struct type
+		if cachedType, ok := typeCache[abiTypeName]; ok {
+			return cachedType, nil
+		}
+
+		abiType, ok := findABIType(inputABI, abiTypeName)
+		if !ok {
+			return nil, fmt.Errorf("type %s not found in ABI", abiTypeName)
+		}
+
+		// It is a struct, as we don't support anything else as custom types
+		fields := make([]reflect.StructField, len(abiType.Fields))
+		for i, field := range abiType.Fields {
+			fieldType, err := getReflectType(field.Type, inputABI, typeCache)
+			if err != nil {
+				return nil, err
+			}
+			fields[i] = reflect.StructField{
+				Name: cases.Title(language.English).String(field.Name),
+				Type: fieldType,
+				Tag:  reflect.StructTag(fmt.Sprintf(`serialize:"true" json:"%s"`, field.Name)),
+			}
+		}
+
+		structType := reflect.StructOf(fields)
+		typeCache[abiTypeName] = structType
+
+		return structType, nil
+	}
+}
+
+func findABIType(inputABI abi.ABI, typeName string) (abi.Type, bool) {
+	for _, typ := range inputABI.Types {
+		if typ.Name == typeName {
+			return typ, true
+		}
+	}
+	return abi.Type{}, false
+}

abi/dynamic/reflect_marshal_test.go

@@ -0,0 +1,94 @@
+// Copyright (C) 2024, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package dynamic
+
+import (
+	"encoding/hex"
+	"encoding/json"
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/ava-labs/hypersdk/abi"
+)
+
+func TestDynamicMarshal(t *testing.T) {
+	require := require.New(t)
+
+	abiJSON := mustReadFile(t, "../testdata/abi.json")
+	var abi abi.ABI
+
+	err := json.Unmarshal(abiJSON, &abi)
+	require.NoError(err)
+
+	testCases := []struct {
+		name     string
+		typeName string
+	}{
+		{"empty", "MockObjectSingleNumber"},
+		{"uint16", "MockObjectSingleNumber"},
+		{"numbers", "MockObjectAllNumbers"},
+		{"arrays", "MockObjectArrays"},
+		{"transfer", "MockActionTransfer"},
+		{"transferField", "MockActionWithTransfer"},
+		{"transfersArray", "MockActionWithTransferArray"},
+		{"strBytes", "MockObjectStringAndBytes"},
+		{"strByteZero", "MockObjectStringAndBytes"},
+		{"strBytesEmpty", "MockObjectStringAndBytes"},
+		{"strOnly", "MockObjectStringAndBytes"},
+		{"outer", "Outer"},
+		{"fixedBytes", "FixedBytes"},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			// Read the JSON data
+			jsonData := mustReadFile(t, "../testdata/"+tc.name+".json")
+
+			objectBytes, err := Marshal(abi, tc.typeName, string(jsonData))
+			require.NoError(err)
+
+			// Compare with expected hex
+			expectedHex := string(mustReadFile(t, "../testdata/"+tc.name+".hex"))
+			expectedHex = strings.TrimSpace(expectedHex)
+			require.Equal(expectedHex, hex.EncodeToString(objectBytes))
+
+			unmarshaledJSON, err := Unmarshal(abi, tc.typeName, objectBytes)
+			require.NoError(err)
+
+			// Compare with expected JSON
+			require.JSONEq(string(jsonData), unmarshaledJSON)
+		})
+	}
+}
+
+func TestDynamicMarshalErrors(t *testing.T) {
+	require := require.New(t)
+
+	abiJSON := mustReadFile(t, "../testdata/abi.json")
+	var abi abi.ABI
+
+	err := json.Unmarshal(abiJSON, &abi)
+	require.NoError(err)
+
+	// Test malformed JSON
+	malformedJSON := `{"uint8": 42, "uint16": 1000, "uint32": 100000, "uint64": 10000000000, "int8": -42, "int16": -1000, "int32": -100000, "int64": -10000000000,`
+	_, err = Marshal(abi, "MockObjectAllNumbers", malformedJSON)
+	require.Contains(err.Error(), "unexpected end of JSON input")
+
+	// Test wrong struct name
+	jsonData := mustReadFile(t, "../testdata/numbers.json")
+	_, err = Marshal(abi, "NonExistentObject", string(jsonData))
+	require.ErrorIs(err, ErrTypeNotFound)
+}
+
+func mustReadFile(t *testing.T, path string) []byte {
+	t.Helper()
+
+	content, err := os.ReadFile(path)
+	require.NoError(t, err)
+	return content
+}

abi/testdata/transfer.json

@@ -1,5 +1,5 @@
 {
-    "to": "0102030405060708090a0b0c0d0e0f101112131400000000000000000000000000",
+    "to": "0x0102030405060708090a0b0c0d0e0f101112131400000000000000000000000000",
     "value": 1000,
     "memo": "aGk="
 }

abi/testdata/transferField.json

@@ -1,6 +1,6 @@
 {
     "transfer": {
-        "to": "0102030405060708090a0b0c0d0e0f101112131400000000000000000000000000",
+        "to": "0x0102030405060708090a0b0c0d0e0f101112131400000000000000000000000000",
         "value": 1000,
         "memo": "aGk="
     }

abi/testdata/transfersArray.json

@@ -1,12 +1,12 @@
 {
     "transfers": [
         {
-            "to": "0102030405060708090a0b0c0d0e0f101112131400000000000000000000000000",
+            "to": "0x0102030405060708090a0b0c0d0e0f101112131400000000000000000000000000",
             "value": 1000,
             "memo": "aGk="
         },
         {
-            "to": "0102030405060708090a0b0c0d0e0f101112131400000000000000000000000000",
+            "to": "0x0102030405060708090a0b0c0d0e0f101112131400000000000000000000000000",
             "value": 1000,
             "memo": "aGk="
         }

go.mod

@@ -27,6 +27,7 @@ require (
 	golang.org/x/crypto v0.22.0
 	golang.org/x/exp v0.0.0-20231127185646-65229373498e
 	golang.org/x/sync v0.7.0
+	golang.org/x/text v0.14.0
 	google.golang.org/grpc v1.62.0
 	google.golang.org/protobuf v1.34.2
 	gopkg.in/yaml.v2 v2.4.0
@@ -143,7 +144,6 @@ require (
 	golang.org/x/net v0.24.0 // indirect
 	golang.org/x/sys v0.19.0 // indirect
 	golang.org/x/term v0.19.0 // indirect
-	golang.org/x/text v0.14.0 // indirect
 	golang.org/x/time v0.3.0 // indirect
 	golang.org/x/tools v0.17.0 // indirect
 	gonum.org/v1/gonum v0.11.0 // indirect