/
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
import "strings"
// Code using batches should try to add this much data to the batch.
// The value was determined empirically.
type DBType string
const (
LevelDB DBType = "LevelDB"
BadgerDB = "BadgerDB"
MemoryDB = "MemoryDB"
DynamoDB = "DynamoDBS3"
ShardedDB = "ShardedDB"
)
// ToValid converts DBType to a valid one.
// If it is unable to convert, "" is returned.
func (db DBType) ToValid() DBType {
validDBType := []DBType{LevelDB, BadgerDB, MemoryDB, DynamoDB}
for _, vdb := range validDBType {
if strings.ToLower(string(vdb)) == strings.ToLower(string(db)) {
return vdb
}
}
return ""
}
// selfShardable returns if the db is able to shard by itself or not
func (db DBType) selfShardable() bool {
switch db {
case DynamoDB:
return true
}
return false
}
// KeyValueWriter wraps the Put method of a backing data store.
type KeyValueWriter interface {
// Put inserts the given value into the key-value data store.
Put(key []byte, value []byte) error
// Delete removes the key from the key-value data store.
Delete(key []byte) error
}
// Database wraps all database operations. All methods are safe for concurrent use.
type Database interface {
KeyValueWriter
Get(key []byte) ([]byte, error)
Has(key []byte) (bool, error)
Close()
NewBatch() Batch
Type() DBType
Meter(prefix string)
Iteratee
}
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
}
batch.Reset()
}
}
return bytes, nil
}
func WriteBatchesParallel(batches ...Batch) (int, error) {
type result struct {
bytes int
err error
}
resultCh := make(chan result, len(batches))
for _, batch := range batches {
go func(batch Batch) {
bytes := batch.ValueSize()
err := batch.Write()
if err != nil {
batch.Reset()
}
resultCh <- result{bytes, err}
}(batch)
}
var bytes int
for range batches {
rst := <-resultCh
if rst.err != nil {
return bytes, rst.err
}
bytes += rst.bytes
}
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
}