neoneo-go/pkg/core/interop_neo.go
Evgeniy Stratonikov 9b1a7021ba core: add PickN flags to Storage.Find
Allow to pick items by index from serialized struct or array.
2021-01-15 21:12:10 +03:00

63 lines
2.1 KiB
Go

package core
import (
"bytes"
"errors"
"fmt"
"sort"
"github.com/nspcc-dev/neo-go/pkg/core/interop"
"github.com/nspcc-dev/neo-go/pkg/core/interop/storage"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
var (
errGasLimitExceeded = errors.New("gas limit exceeded")
errFindInvalidOptions = errors.New("invalid Find options")
)
// storageFind finds stored key-value pair.
func storageFind(ic *interop.Context) error {
stcInterface := ic.VM.Estack().Pop().Value()
stc, ok := stcInterface.(*StorageContext)
if !ok {
return fmt.Errorf("%T is not a StorageContext", stcInterface)
}
prefix := ic.VM.Estack().Pop().Bytes()
opts := ic.VM.Estack().Pop().BigInt().Int64()
if opts&^storage.FindAll != 0 {
return fmt.Errorf("%w: unknown flag", errFindInvalidOptions)
}
if opts&storage.FindKeysOnly != 0 &&
opts&(storage.FindDeserialize|storage.FindPick0|storage.FindPick1) != 0 {
return fmt.Errorf("%w KeysOnly conflicts with other options", errFindInvalidOptions)
}
if opts&storage.FindValuesOnly != 0 &&
opts&(storage.FindKeysOnly|storage.FindRemovePrefix) != 0 {
return fmt.Errorf("%w: KeysOnly conflicts with ValuesOnly", errFindInvalidOptions)
}
if opts&storage.FindPick0 != 0 && opts&storage.FindPick1 != 0 {
return fmt.Errorf("%w: Pick0 conflicts with Pick1", errFindInvalidOptions)
}
if opts&storage.FindDeserialize == 0 && (opts&storage.FindPick0 != 0 || opts&storage.FindPick1 != 0) {
return fmt.Errorf("%w: PickN is specified without Deserialize", errFindInvalidOptions)
}
siMap, err := ic.DAO.GetStorageItemsWithPrefix(stc.ID, prefix)
if err != nil {
return err
}
filteredMap := stackitem.NewMap()
for k, v := range siMap {
filteredMap.Add(stackitem.NewByteArray(append(prefix, []byte(k)...)), stackitem.NewByteArray(v.Value))
}
sort.Slice(filteredMap.Value().([]stackitem.MapElement), func(i, j int) bool {
return bytes.Compare(filteredMap.Value().([]stackitem.MapElement)[i].Key.Value().([]byte),
filteredMap.Value().([]stackitem.MapElement)[j].Key.Value().([]byte)) == -1
})
item := storage.NewIterator(filteredMap, opts)
ic.VM.Estack().PushVal(stackitem.NewInterop(item))
return nil
}