neo-go/pkg/core/interop_neo.go

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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.
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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)
}
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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 {
key := append(prefix, []byte(k)...)
keycopy := make([]byte, len(key))
copy(keycopy, key)
filteredMap.Add(stackitem.NewByteArray(keycopy), stackitem.NewByteArray(v))
}
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, len(prefix), opts)
ic.VM.Estack().PushVal(stackitem.NewInterop(item))
return nil
}