forked from TrueCloudLab/neoneo-go
104 lines
2.3 KiB
Go
104 lines
2.3 KiB
Go
package state
|
|
|
|
import (
|
|
"errors"
|
|
"math/big"
|
|
"unicode/utf8"
|
|
|
|
"github.com/nspcc-dev/neo-go/pkg/util"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
|
|
)
|
|
|
|
// OracleRequest represents an oracle request.
|
|
type OracleRequest struct {
|
|
OriginalTxID util.Uint256
|
|
GasForResponse uint64
|
|
URL string
|
|
Filter *string
|
|
CallbackContract util.Uint160
|
|
CallbackMethod string
|
|
UserData []byte
|
|
}
|
|
|
|
// ToStackItem implements stackitem.Convertible interface. It never returns an
|
|
// error.
|
|
func (o *OracleRequest) ToStackItem() (stackitem.Item, error) {
|
|
filter := stackitem.Item(stackitem.Null{})
|
|
if o.Filter != nil {
|
|
filter = stackitem.Make(*o.Filter)
|
|
}
|
|
return stackitem.NewArray([]stackitem.Item{
|
|
stackitem.NewByteArray(o.OriginalTxID.BytesBE()),
|
|
stackitem.NewBigInteger(new(big.Int).SetUint64(o.GasForResponse)),
|
|
stackitem.Make(o.URL),
|
|
filter,
|
|
stackitem.NewByteArray(o.CallbackContract.BytesBE()),
|
|
stackitem.Make(o.CallbackMethod),
|
|
stackitem.NewByteArray(o.UserData),
|
|
}), nil
|
|
}
|
|
|
|
// FromStackItem implements stackitem.Convertible interface.
|
|
func (o *OracleRequest) FromStackItem(it stackitem.Item) error {
|
|
arr, ok := it.Value().([]stackitem.Item)
|
|
if !ok || len(arr) < 7 {
|
|
return errors.New("not an array of needed length")
|
|
}
|
|
bs, err := arr[0].TryBytes()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
o.OriginalTxID, err = util.Uint256DecodeBytesBE(bs)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
gas, err := arr[1].TryInteger()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
o.GasForResponse = gas.Uint64()
|
|
|
|
s, isNull, ok := itemToString(arr[2])
|
|
if !ok || isNull {
|
|
return errors.New("invalid URL")
|
|
}
|
|
o.URL = s
|
|
|
|
s, isNull, ok = itemToString(arr[3])
|
|
if !ok {
|
|
return errors.New("invalid filter")
|
|
} else if !isNull {
|
|
filter := s
|
|
o.Filter = &filter
|
|
}
|
|
|
|
bs, err = arr[4].TryBytes()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
o.CallbackContract, err = util.Uint160DecodeBytesBE(bs)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
o.CallbackMethod, isNull, ok = itemToString(arr[5])
|
|
if !ok || isNull {
|
|
return errors.New("invalid callback method")
|
|
}
|
|
|
|
o.UserData, err = arr[6].TryBytes()
|
|
return err
|
|
}
|
|
|
|
func itemToString(it stackitem.Item) (string, bool, bool) {
|
|
_, ok := it.(stackitem.Null)
|
|
if ok {
|
|
return "", true, true
|
|
}
|
|
bs, err := it.TryBytes()
|
|
if err != nil || !utf8.Valid(bs) {
|
|
return "", false, false
|
|
}
|
|
return string(bs), false, true
|
|
}
|