accounts/abi: Deduplicate code in unpacker

accounts/abi/argument.go

@@ -84,21 +84,27 @@ func (arguments Arguments) isTuple() bool {
 
 // Unpack performs the operation hexdata -> Go format
 func (arguments Arguments) Unpack(v interface{}, data []byte) error {
-	if arguments.isTuple() {
-		return arguments.unpackTuple(v, data)
-	}
-	return arguments.unpackAtomic(v, data)
-}
 
-func (arguments Arguments) unpackTuple(v interface{}, output []byte) error {
 	// make sure the passed value is arguments pointer
-	valueOf := reflect.ValueOf(v)
+	if reflect.Ptr != reflect.ValueOf(v).Kind() {
-	if reflect.Ptr != valueOf.Kind() {
 		return fmt.Errorf("abi: Unpack(non-pointer %T)", v)
 	}
 
+	marshalledValues, err := arguments.UnpackValues(data)
+	if err != nil {
+		return err
+	}
+
+	if arguments.isTuple() {
+		return arguments.unpackTuple(v, marshalledValues)
+	}
+	return arguments.unpackAtomic(v, marshalledValues)
+}
+
+func (arguments Arguments) unpackTuple(v interface{}, marshalledValues []interface{}) error {
+
 	var (
-		value = valueOf.Elem()
+		value = reflect.ValueOf(v).Elem()
 		typ   = value.Type()
 		kind  = value.Kind()
 	)
@@ -120,25 +126,9 @@ func (arguments Arguments) unpackTuple(v interface{}, output []byte) error {
 			exists[field] = true
 		}
 	}
-	// `i` counts the nonindexed arguments.
-	// `j` counts the number of complex types.
-	// both `i` and `j` are used to to correctly compute `data` offset.
-
-	j := 0
 	for i, arg := range arguments.NonIndexed() {
 
-		marshalledValue, err := toGoType((i+j)*32, arg.Type, output)
+		reflectValue := reflect.ValueOf(marshalledValues[i])
-		if err != nil {
-			return err
-		}
-
-		if arg.Type.T == ArrayTy {
-			// combined index ('i' + 'j') need to be adjusted only by size of array, thus
-			// we need to decrement 'j' because 'i' was incremented
-			j += arg.Type.Size - 1
-		}
-
-		reflectValue := reflect.ValueOf(marshalledValue)
 
 		switch kind {
 		case reflect.Struct:
@@ -171,23 +161,15 @@ func (arguments Arguments) unpackTuple(v interface{}, output []byte) error {
 }
 
 // unpackAtomic unpacks ( hexdata -> go ) a single value
-func (arguments Arguments) unpackAtomic(v interface{}, output []byte) error {
+func (arguments Arguments) unpackAtomic(v interface{}, marshalledValues []interface{}) error {
-	// make sure the passed value is arguments pointer
-	valueOf := reflect.ValueOf(v)
-	if reflect.Ptr != valueOf.Kind() {
-		return fmt.Errorf("abi: Unpack(non-pointer %T)", v)
-	}
-	arg := arguments[0]
-	if arg.Indexed {
-		return fmt.Errorf("abi: attempting to unpack indexed variable into element.")
-	}
 
-	value := valueOf.Elem()
+	if len(marshalledValues) != 1 {
-	marshalledValue, err := toGoType(0, arg.Type, output)
+		return fmt.Errorf("abi: wrong length, expected single value, got %d", len(marshalledValues))
-	if err != nil {
-		return err
 	}
-	return set(value, reflect.ValueOf(marshalledValue), arg)
+
+	elem := reflect.ValueOf(v).Elem()
+	reflectValue := reflect.ValueOf(marshalledValues[0])
+	return set(elem, reflectValue, arguments.NonIndexed()[0])
 }
 
 // UnpackValues can be used to unpack ABI-encoded hexdata according to the ABI-specification,
@@ -226,7 +208,6 @@ func (arguments Arguments) PackValues(args []interface{}) ([]byte, error) {
 	return arguments.Pack(args...)
 }
 
-
 // Pack performs the operation Go format -> Hexdata
 func (arguments Arguments) Pack(args ...interface{}) ([]byte, error) {
 	// Make sure arguments match up and pack them

accounts/abi/unpackv2_test.go

@@ -57,7 +57,6 @@ func TestUnpackV2(t *testing.T) {
 	}
 }
 
-
 func TestMultiReturnWithArrayV2(t *testing.T) {
 	const definition = `[{"name" : "multi", "outputs": [{"type": "uint64[3]"}, {"type": "uint64"}]}]`
 	abi, err := JSON(strings.NewReader(definition))