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cleveldb.go
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cleveldb.go
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// +build cleveldb
package db
import (
"fmt"
"path/filepath"
"github.com/jmhodges/levigo"
)
func init() {
dbCreator := func(name string, dir string) (DB, error) {
return NewCLevelDB(name, dir)
}
registerDBCreator(CLevelDBBackend, dbCreator, false)
}
// CLevelDB uses the C LevelDB database via a Go wrapper.
type CLevelDB struct {
db *levigo.DB
ro *levigo.ReadOptions
wo *levigo.WriteOptions
woSync *levigo.WriteOptions
}
var _ DB = (*CLevelDB)(nil)
// NewCLevelDB creates a new CLevelDB.
func NewCLevelDB(name string, dir string) (*CLevelDB, error) {
dbPath := filepath.Join(dir, name+".db")
opts := levigo.NewOptions()
opts.SetCache(levigo.NewLRUCache(1 << 30))
opts.SetCreateIfMissing(true)
db, err := levigo.Open(dbPath, opts)
if err != nil {
return nil, err
}
ro := levigo.NewReadOptions()
wo := levigo.NewWriteOptions()
woSync := levigo.NewWriteOptions()
woSync.SetSync(true)
database := &CLevelDB{
db: db,
ro: ro,
wo: wo,
woSync: woSync,
}
return database, nil
}
// Get implements DB.
func (db *CLevelDB) Get(key []byte) ([]byte, error) {
if len(key) == 0 {
return nil, errKeyEmpty
}
res, err := db.db.Get(db.ro, key)
if err != nil {
return nil, err
}
return res, nil
}
// Has implements DB.
func (db *CLevelDB) Has(key []byte) (bool, error) {
bytes, err := db.Get(key)
if err != nil {
return false, err
}
return bytes != nil, nil
}
// Set implements DB.
func (db *CLevelDB) Set(key []byte, value []byte) error {
if len(key) == 0 {
return errKeyEmpty
}
if value == nil {
return errValueNil
}
if err := db.db.Put(db.wo, key, value); err != nil {
return err
}
return nil
}
// SetSync implements DB.
func (db *CLevelDB) SetSync(key []byte, value []byte) error {
if len(key) == 0 {
return errKeyEmpty
}
if value == nil {
return errValueNil
}
if err := db.db.Put(db.woSync, key, value); err != nil {
return err
}
return nil
}
// Delete implements DB.
func (db *CLevelDB) Delete(key []byte) error {
if len(key) == 0 {
return errKeyEmpty
}
if err := db.db.Delete(db.wo, key); err != nil {
return err
}
return nil
}
// DeleteSync implements DB.
func (db *CLevelDB) DeleteSync(key []byte) error {
if len(key) == 0 {
return errKeyEmpty
}
if err := db.db.Delete(db.woSync, key); err != nil {
return err
}
return nil
}
// FIXME This should not be exposed
func (db *CLevelDB) DB() *levigo.DB {
return db.db
}
// Close implements DB.
func (db *CLevelDB) Close() error {
db.db.Close()
db.ro.Close()
db.wo.Close()
db.woSync.Close()
return nil
}
// Print implements DB.
func (db *CLevelDB) Print() error {
itr, err := db.Iterator(nil, nil)
if err != nil {
return err
}
defer itr.Close()
for ; itr.Valid(); itr.Next() {
key := itr.Key()
value := itr.Value()
fmt.Printf("[%X]:\t[%X]\n", key, value)
}
return nil
}
// Stats implements DB.
func (db *CLevelDB) Stats() map[string]string {
keys := []string{
"leveldb.aliveiters",
"leveldb.alivesnaps",
"leveldb.blockpool",
"leveldb.cachedblock",
"leveldb.num-files-at-level{n}",
"leveldb.openedtables",
"leveldb.sstables",
"leveldb.stats",
}
stats := make(map[string]string, len(keys))
for _, key := range keys {
str := db.db.PropertyValue(key)
stats[key] = str
}
return stats
}
// NewBatch implements DB.
func (db *CLevelDB) NewBatch() Batch {
return newCLevelDBBatch(db)
}
// Iterator implements DB.
func (db *CLevelDB) Iterator(start, end []byte) (Iterator, error) {
if (start != nil && len(start) == 0) || (end != nil && len(end) == 0) {
return nil, errKeyEmpty
}
itr := db.db.NewIterator(db.ro)
return newCLevelDBIterator(itr, start, end, false), nil
}
// ReverseIterator implements DB.
func (db *CLevelDB) ReverseIterator(start, end []byte) (Iterator, error) {
if (start != nil && len(start) == 0) || (end != nil && len(end) == 0) {
return nil, errKeyEmpty
}
itr := db.db.NewIterator(db.ro)
return newCLevelDBIterator(itr, start, end, true), nil
}