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[#122] Add BigIntFromStackItem

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Neo-go can return big.Int values on stack after contract execution.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>
This commit is contained in:
Alex Vanin 2020-10-28 15:59:40 +03:00 committed by Alex Vanin
parent 330c4b42d9
commit e3c060b739
2 changed files with 33 additions and 0 deletions
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6
pkg/morph/client/util.go
View file

@ -2,6 +2,7 @@ package client
import (
"encoding/binary"
"math/big"
sc "github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
@ -157,6 +158,11 @@ func IntFromStackItem(param stackitem.Item) (int64, error) {
}
}
// 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() {

27
pkg/morph/client/util_test.go
View file

@ -1,9 +1,11 @@
package client
import (
"math"
"math/big"
"testing"
"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
sc "github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
"github.com/stretchr/testify/require"
@ -50,9 +52,13 @@ var (
Value: []sc.Parameter{intParam, byteArrayParam},
}
bigIntValue = new(big.Int).Mul(big.NewInt(math.MaxInt64), big.NewInt(10))
stringByteItem = stackitem.NewByteArray([]byte("Hello World"))
intItem = stackitem.NewBigInteger(new(big.Int).SetInt64(1))
bigIntItem = stackitem.NewBigInteger(bigIntValue)
byteWithIntItem = stackitem.NewByteArray([]byte{0x0a})
byteWithBigIntItem = stackitem.NewByteArray(bigint.ToBytes(bigIntValue))
emptyByteArrayItem = stackitem.NewByteArray([]byte{})
trueBoolItem = stackitem.NewBool(true)
falseBoolItem = stackitem.NewBool(false)
@ -233,6 +239,27 @@ func TestIntFromStackItem(t *testing.T) {
})
}
func TestBigIntFromStackItem(t *testing.T) {
t.Run("correct assert", func(t *testing.T) {
val, err := BigIntFromStackItem(bigIntItem)
require.NoError(t, err)
require.Equal(t, bigIntValue, val)
val, err = BigIntFromStackItem(byteWithBigIntItem)
require.NoError(t, err)
require.Equal(t, bigIntValue, val)
val, err = BigIntFromStackItem(emptyByteArrayItem)
require.NoError(t, err)
require.Equal(t, big.NewInt(0), val)
})
t.Run("incorrect assert", func(t *testing.T) {
_, err := BigIntFromStackItem(arrayItem)
require.Error(t, err)
})
}
func TestStringFromStackItem(t *testing.T) {
t.Run("correct assert", func(t *testing.T) {
val, err := StringFromStackItem(stringByteItem)