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interface.go
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interface.go
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// Modifications Copyright 2018 The klaytn Authors
// Copyright 2015 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/>.
//
// This file is derived from ethdb/interface.go (2018/06/04).
// Modified and improved for the klaytn development.
package database
// Code using batches should try to add this much data to the batch.
// The value was determined empirically.
type DBType uint8
const (
_ DBType = iota
LevelDB
BadgerDB
MemoryDB
PartitionedDB
)
func (dbType DBType) String() string {
switch dbType {
case LevelDB:
return "LevelDB"
case BadgerDB:
return "BadgerDB"
case MemoryDB:
return "MemoryDB"
case PartitionedDB:
return "PartitionedDB"
default:
logger.Error("Undefined DBType entered.", "entered DBType", dbType)
return "undefined"
}
}
const IdealBatchSize = 100 * 1024
// Putter wraps the database write operation supported by both batches and regular databases.
type Putter interface {
Put(key []byte, value []byte) error
}
// Database wraps all database operations. All methods are safe for concurrent use.
type Database interface {
Putter
Get(key []byte) ([]byte, error)
Has(key []byte) (bool, error)
Delete(key []byte) error
Close()
NewBatch() Batch
Type() DBType
Meter(prefix string)
}
// Batch is a write-only database that commits changes to its host database
// when Write is called. Batch cannot be used concurrently.
type Batch interface {
Putter
ValueSize() int // amount of data in the batch
Write() error
// Reset resets the batch for reuse
Reset()
}
func WriteBatches(batches ...Batch) (int, error) {
bytes := 0
for _, batch := range batches {
if batch.ValueSize() > 0 {
bytes += batch.ValueSize()
if err := batch.Write(); err != nil {
return 0, err
}
}
}
return bytes, nil
}
func WriteBatchesOverThreshold(batches ...Batch) (int, error) {
bytes := 0
for _, batch := range batches {
if batch.ValueSize() >= IdealBatchSize {
if err := batch.Write(); err != nil {
return 0, err
}
bytes += batch.ValueSize()
batch.Reset()
}
}
return bytes, nil
}
func PutAndWriteBatchesOverThreshold(batch Batch, key, val []byte) error {
if err := batch.Put(key, val); err != nil {
return err
}
if batch.ValueSize() >= IdealBatchSize {
if err := batch.Write(); err != nil {
return err
}
batch.Reset()
}
return nil
}