From c207edf2a3a6f48b4fc78cc55982d648eedab198 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jano=C5=A1=20Gulja=C5=A1?= <janos@users.noreply.github.com>
Date: Mon, 26 Nov 2018 18:49:01 +0100
Subject: swarm: add database abstractions (shed package) (#18183)

---
 swarm/shed/field_struct.go | 71 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 swarm/shed/field_struct.go

(limited to 'swarm/shed/field_struct.go')

diff --git a/swarm/shed/field_struct.go b/swarm/shed/field_struct.go
new file mode 100644
index 000000000..90daee7fc
--- /dev/null
+++ b/swarm/shed/field_struct.go
@@ -0,0 +1,71 @@
+// 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
+}
-- 
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