bacther

batch.go

@@ -0,0 +1,99 @@
+// VulcanizeDB
+// Copyright © 2020 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program 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 Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package ipfseth
+
+import (
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/jmoiron/sqlx"
+)
+
+type Batch struct {
+	db   *sqlx.DB
+	tx   *sqlx.Tx
+	size int
+}
+
+func NewBatch(db *sqlx.DB) ethdb.Batch {
+	return &Batch{
+		db: db,
+	}
+}
+
+// Put satisfies the ethdb.Batch interface
+// Put inserts the given value into the key-value data store
+func (b *Batch) Put(key []byte, value []byte) (err error) {
+	if b.tx == nil {
+		b.Reset()
+	}
+	mhKey, err := MultihashKeyFromKeccak256(key)
+	if err != nil {
+		return err
+	}
+	_, err = b.tx.Exec(putPgStr, mhKey, value)
+	if err != nil {
+		return err
+	}
+	b.size += len(value)
+	return nil
+}
+
+// Delete satisfies the ethdb.Batch interface
+// Delete removes the key from the key-value data store
+func (b *Batch) Delete(key []byte) (err error) {
+	if b.tx == nil {
+		b.Reset()
+	}
+	mhKey, err := MultihashKeyFromKeccak256(key)
+	if err != nil {
+		return err
+	}
+	_, err = b.tx.Exec(deletePgStr, mhKey)
+	return err
+}
+
+// ValueSize satisfies the ethdb.Batch interface
+// ValueSize retrieves the amount of data queued up for writing
+// The returned value is the total byte length of all data queued to write
+func (b *Batch) ValueSize() int {
+	return b.size
+}
+
+// Write satisfies the ethdb.Batch interface
+// Write flushes any accumulated data to disk
+func (b *Batch) Write() error {
+	if b.tx == nil {
+		return nil
+	}
+	return b.tx.Commit()
+}
+
+// Replay satisfies the ethdb.Batch interface
+// Replay replays the batch contents
+func (b *Batch) Replay(w ethdb.KeyValueWriter) error {
+	return errNotSupported
+}
+
+// Reset satisfies the ethdb.Batch interface
+// Reset resets the batch for reuse
+func (b *Batch) Reset() {
+	var err error
+	b.tx, err = b.db.Beginx()
+	if err != nil {
+		panic(err)
+	}
+	b.size = 0
+}