frostfs-node/pkg/morph/client/util.go

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2020-07-24 13:54:03 +00:00
package client
import (
"math/big"
"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.
*/
// 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())
}
}
// BigIntFromStackItem receives numerical value from the value of a smart contract parameter.
func BigIntFromStackItem(param stackitem.Item) (*big.Int, error) {
return param.TryInteger()
}
// 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.IntegerT:
n, err := param.TryInteger()
if err != nil {
return nil, errors.Wrap(err, "can't parse integer bytes")
}
return n.Bytes(), nil
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, stackitem.StructT:
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)
}