65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
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package core
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import (
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"github.com/CityOfZion/neo-go/pkg/core/storage"
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"github.com/CityOfZion/neo-go/pkg/io"
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"github.com/CityOfZion/neo-go/pkg/util"
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)
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// StorageItem is the value to be stored with read-only flag.
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type StorageItem struct {
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Value []byte
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IsConst bool
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}
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// makeStorageItemKey returns a key used to store StorageItem in the DB.
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func makeStorageItemKey(scripthash util.Uint160, key []byte) []byte {
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return storage.AppendPrefix(storage.STStorage, append(scripthash.BytesReverse(), key...))
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}
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// getStorageItemFromStore returns StorageItem if it exists in the given Store.
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func getStorageItemFromStore(s storage.Store, scripthash util.Uint160, key []byte) *StorageItem {
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b, err := s.Get(makeStorageItemKey(scripthash, key))
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if err != nil {
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return nil
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}
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r := io.NewBinReaderFromBuf(b)
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si := &StorageItem{}
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si.DecodeBinary(r)
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if r.Err != nil {
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return nil
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}
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return si
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}
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// putStorageItemIntoStore puts given StorageItem for given script with given
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// key into the given Store.
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func putStorageItemIntoStore(s storage.Store, scripthash util.Uint160, key []byte, si *StorageItem) error {
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buf := io.NewBufBinWriter()
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si.EncodeBinary(buf.BinWriter)
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if buf.Err != nil {
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return buf.Err
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}
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return s.Put(makeStorageItemKey(scripthash, key), buf.Bytes())
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}
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// deleteStorageItemInStore drops storage item for the given script with the
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// given key from the Store.
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func deleteStorageItemInStore(s storage.Store, scripthash util.Uint160, key []byte) error {
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return s.Delete(makeStorageItemKey(scripthash, key))
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}
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// EncodeBinary implements Serializable interface.
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func (si *StorageItem) EncodeBinary(w *io.BinWriter) {
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w.WriteBytes(si.Value)
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w.WriteLE(si.IsConst)
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}
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// DecodeBinary implements Serializable interface.
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func (si *StorageItem) DecodeBinary(r *io.BinReader) {
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si.Value = r.ReadBytes()
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r.ReadLE(&si.IsConst)
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}
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