frostfs-node/pkg/morph/client/util.go
Alex Vanin 2ab855b2ec [#7] Allow to get bytes from buffer stackitem
Smart-contract can return slice of bytes as buffer type.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>
2020-10-02 11:25:35 +03:00

201 lines
5.8 KiB
Go

package client
import (
"encoding/binary"
sc "github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
"github.com/pkg/errors"
)
/*
Use these function to parse stack parameters obtained from `TestInvoke`
function to native go types. You should know upfront return types of invoked
method.
*/
// BoolFromStackParameter receives boolean value from the value of a smart contract parameter.
func BoolFromStackParameter(param sc.Parameter) (bool, error) {
switch param.Type {
case sc.BoolType:
val, ok := param.Value.(bool)
if !ok {
return false, errors.Errorf("chain/client: can't convert %T to boolean", param.Value)
}
return val, nil
case sc.IntegerType:
val, ok := param.Value.(int64)
if !ok {
return false, errors.Errorf("chain/client: can't convert %T to boolean", param.Value)
}
return val > 0, nil
case sc.ByteArrayType:
val, ok := param.Value.([]byte)
if !ok {
return false, errors.Errorf("chain/client: can't convert %T to boolean", param.Value)
}
return len(val) != 0, nil
default:
return false, errors.Errorf("chain/client: %s is not a bool type", param.Type)
}
}
// IntFromStackParameter receives numerical value from the value of a smart contract parameter.
func IntFromStackParameter(param sc.Parameter) (int64, error) {
switch param.Type {
case sc.IntegerType:
val, ok := param.Value.(int64)
if !ok {
return 0, errors.Errorf("chain/client: can't convert %T to integer", param.Value)
}
return val, nil
case sc.ByteArrayType:
val, ok := param.Value.([]byte)
if !ok || len(val) > 8 {
return 0, errors.Errorf("chain/client: can't convert %T to integer", param.Value)
}
res := make([]byte, 8)
copy(res[:len(val)], val)
return int64(binary.LittleEndian.Uint64(res)), nil
default:
return 0, errors.Errorf("chain/client: %s is not an integer type", param.Type)
}
}
// BytesFromStackParameter receives binary value from the value of a smart contract parameter.
func BytesFromStackParameter(param sc.Parameter) ([]byte, error) {
if param.Type != sc.ByteArrayType {
if param.Type == sc.AnyType && param.Value == nil {
return nil, nil
}
return nil, errors.Errorf("chain/client: %s is not a byte array type", param.Type)
}
val, ok := param.Value.([]byte)
if !ok {
return nil, errors.Errorf("chain/client: can't convert %T to byte slice", param.Value)
}
return val, nil
}
// ArrayFromStackParameter returns the slice contract parameters from passed parameter.
//
// If passed parameter carries boolean false value, (nil, nil) returns.
func ArrayFromStackParameter(param sc.Parameter) ([]sc.Parameter, error) {
if param.Type == sc.BoolType && !param.Value.(bool) {
return nil, nil
}
if param.Type != sc.ArrayType {
if param.Type == sc.AnyType && param.Value == nil {
return nil, nil
}
return nil, errors.Errorf("chain/client: %s is not an array type", param.Type)
}
val, ok := param.Value.([]sc.Parameter)
if !ok {
return nil, errors.Errorf("chain/client: can't convert %T to parameter slice", param.Value)
}
return val, nil
}
// StringFromStackParameter receives string value from the value of a smart contract parameter.
func StringFromStackParameter(param sc.Parameter) (string, error) {
switch param.Type {
case sc.StringType:
val, ok := param.Value.(string)
if !ok {
return "", errors.Errorf("chain/client: can't convert %T to string", param.Value)
}
return val, nil
case sc.ByteArrayType:
val, ok := param.Value.([]byte)
if !ok {
return "", errors.Errorf("chain/client: can't convert %T to string", param.Value)
}
return string(val), nil
default:
return "", errors.Errorf("chain/client: %s is not a string type", param.Type)
}
}
// BoolFromStackItem receives boolean value from the value of a smart contract parameter.
func BoolFromStackItem(param stackitem.Item) (bool, error) {
switch param.Type() {
case stackitem.BooleanT, stackitem.IntegerT, stackitem.ByteArrayT:
return param.TryBool()
default:
return false, errors.Errorf("chain/client: %s is not a bool type", param.Type())
}
}
// IntFromStackItem receives numerical value from the value of a smart contract parameter.
func IntFromStackItem(param stackitem.Item) (int64, error) {
switch param.Type() {
case stackitem.IntegerT, stackitem.ByteArrayT:
i, err := param.TryInteger()
if err != nil {
return 0, err
}
return i.Int64(), nil
default:
return 0, errors.Errorf("chain/client: %s is not an integer type", param.Type())
}
}
// BytesFromStackItem receives binary value from the value of a smart contract parameter.
func BytesFromStackItem(param stackitem.Item) ([]byte, error) {
switch param.Type() {
case stackitem.BufferT, stackitem.ByteArrayT:
return param.TryBytes()
case stackitem.AnyT:
if param.Value() == nil {
return nil, nil
}
fallthrough
default:
return nil, errors.Errorf("chain/client: %s is not a byte array type", param.Type())
}
}
// ArrayFromStackItem returns the slice contract parameters from passed parameter.
//
// If passed parameter carries boolean false value, (nil, nil) returns.
func ArrayFromStackItem(param stackitem.Item) ([]stackitem.Item, error) {
switch param.Type() {
case stackitem.AnyT:
return nil, nil
case stackitem.ArrayT:
items, ok := param.Value().([]stackitem.Item)
if !ok {
return nil, errors.Errorf("chain/client: can't convert %T to parameter slice", param.Value())
}
return items, nil
default:
return nil, errors.Errorf("chain/client: %s is not an array type", param.Type())
}
}
// StringFromStackItem receives string value from the value of a smart contract parameter.
func StringFromStackItem(param stackitem.Item) (string, error) {
if param.Type() != stackitem.ByteArrayT {
return "", errors.Errorf("chain/client: %s is not an integer type", param.Type())
}
return stackitem.ToString(param)
}