frostfs-node/lib/blockchain/goclient/util.go

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package goclient
import (
"encoding/binary"
sc "github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
"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 {
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 {
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)
}
}
// ReadStorage of the contract directly. Use it for debug, try to obtain
// smart-contract data from contract method with TestInvoke function.
func ReadStorage(c *Client, contract util.Uint160, key []byte) ([]byte, error) {
return c.cli.GetStorageByHash(contract, key)
}