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