forked from cerc-io/plugeth
72 lines
2.0 KiB
Go
72 lines
2.0 KiB
Go
// Copyright 2018 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package shed
|
|
|
|
import (
|
|
"github.com/ethereum/go-ethereum/rlp"
|
|
"github.com/syndtr/goleveldb/leveldb"
|
|
)
|
|
|
|
// StructField is a helper to store complex structure by
|
|
// encoding it in RLP format.
|
|
type StructField struct {
|
|
db *DB
|
|
key []byte
|
|
}
|
|
|
|
// NewStructField returns a new StructField.
|
|
// It validates its name and type against the database schema.
|
|
func (db *DB) NewStructField(name string) (f StructField, err error) {
|
|
key, err := db.schemaFieldKey(name, "struct-rlp")
|
|
if err != nil {
|
|
return f, err
|
|
}
|
|
return StructField{
|
|
db: db,
|
|
key: key,
|
|
}, nil
|
|
}
|
|
|
|
// Get unmarshals data from the database to a provided val.
|
|
// If the data is not found leveldb.ErrNotFound is returned.
|
|
func (f StructField) Get(val interface{}) (err error) {
|
|
b, err := f.db.Get(f.key)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return rlp.DecodeBytes(b, val)
|
|
}
|
|
|
|
// Put marshals provided val and saves it to the database.
|
|
func (f StructField) Put(val interface{}) (err error) {
|
|
b, err := rlp.EncodeToBytes(val)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return f.db.Put(f.key, b)
|
|
}
|
|
|
|
// PutInBatch marshals provided val and puts it into the batch.
|
|
func (f StructField) PutInBatch(batch *leveldb.Batch, val interface{}) (err error) {
|
|
b, err := rlp.EncodeToBytes(val)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
batch.Put(f.key, b)
|
|
return nil
|
|
}
|