ipfs-ethdb/postgres/batch.go

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// 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 pgipfsethdb
import (
"github.com/ethereum/go-ethereum/ethdb"
"github.com/jmoiron/sqlx"
)
// Batch is the type that satisfies the ethdb.Batch interface for PG-IPFS Ethereum data using a direct Postgres connection
type Batch struct {
db *sqlx.DB
tx *sqlx.Tx
valueSize int
}
// NewBatch returns a ethdb.Batch interface for PG-IPFS
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func NewBatch(db *sqlx.DB, tx *sqlx.Tx) ethdb.Batch {
b := &Batch{
db: db,
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tx: tx,
}
if tx == nil {
b.Reset()
}
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return b
}
// Put satisfies the ethdb.Batch interface
// Put inserts the given value into the key-value data store
// Key is expected to be the keccak256 hash of value
func (b *Batch) Put(key []byte, value []byte) (err error) {
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mhKey, err := MultihashKeyFromKeccak256(key)
if err != nil {
return err
}
if _, err = b.tx.Exec(putPgStr, mhKey, value); err != nil {
return err
}
b.valueSize += 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) {
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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.valueSize
}
// 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
// This should be called after every write
func (b *Batch) Reset() {
var err error
b.tx, err = b.db.Beginx()
if err != nil {
panic(err)
}
b.valueSize = 0
}