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326 lines
6.1 KiB
326 lines
6.1 KiB
// +build gcc
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package db
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import (
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"bytes"
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"fmt"
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"path/filepath"
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"github.com/jmhodges/levigo"
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)
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func init() {
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dbCreator := func(name string, dir string) (DB, error) {
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return NewCLevelDB(name, dir)
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}
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registerDBCreator(LevelDBBackend, dbCreator, true)
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registerDBCreator(CLevelDBBackend, dbCreator, false)
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}
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var _ DB = (*CLevelDB)(nil)
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type CLevelDB struct {
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db *levigo.DB
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ro *levigo.ReadOptions
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wo *levigo.WriteOptions
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woSync *levigo.WriteOptions
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}
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func NewCLevelDB(name string, dir string) (*CLevelDB, error) {
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dbPath := filepath.Join(dir, name+".db")
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opts := levigo.NewOptions()
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opts.SetCache(levigo.NewLRUCache(1 << 30))
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opts.SetCreateIfMissing(true)
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db, err := levigo.Open(dbPath, opts)
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if err != nil {
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return nil, err
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}
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ro := levigo.NewReadOptions()
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wo := levigo.NewWriteOptions()
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woSync := levigo.NewWriteOptions()
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woSync.SetSync(true)
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database := &CLevelDB{
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db: db,
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ro: ro,
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wo: wo,
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woSync: woSync,
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}
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return database, nil
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}
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// Implements DB.
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func (db *CLevelDB) Get(key []byte) []byte {
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key = nonNilBytes(key)
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res, err := db.db.Get(db.ro, key)
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if err != nil {
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panic(err)
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}
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return res
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}
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// Implements DB.
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func (db *CLevelDB) Has(key []byte) bool {
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return db.Get(key) != nil
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}
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// Implements DB.
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func (db *CLevelDB) Set(key []byte, value []byte) {
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key = nonNilBytes(key)
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value = nonNilBytes(value)
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err := db.db.Put(db.wo, key, value)
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if err != nil {
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panic(err)
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}
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}
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// Implements DB.
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func (db *CLevelDB) SetSync(key []byte, value []byte) {
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key = nonNilBytes(key)
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value = nonNilBytes(value)
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err := db.db.Put(db.woSync, key, value)
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if err != nil {
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panic(err)
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}
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}
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// Implements DB.
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func (db *CLevelDB) Delete(key []byte) {
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key = nonNilBytes(key)
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err := db.db.Delete(db.wo, key)
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if err != nil {
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panic(err)
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}
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}
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// Implements DB.
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func (db *CLevelDB) DeleteSync(key []byte) {
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key = nonNilBytes(key)
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err := db.db.Delete(db.woSync, key)
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if err != nil {
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panic(err)
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}
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}
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func (db *CLevelDB) DB() *levigo.DB {
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return db.db
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}
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// Implements DB.
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func (db *CLevelDB) Close() {
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db.db.Close()
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db.ro.Close()
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db.wo.Close()
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db.woSync.Close()
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}
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// Implements DB.
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func (db *CLevelDB) Print() {
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itr := db.Iterator(nil, nil)
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defer itr.Close()
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for ; itr.Valid(); itr.Next() {
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key := itr.Key()
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value := itr.Value()
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fmt.Printf("[%X]:\t[%X]\n", key, value)
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}
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}
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// Implements DB.
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func (db *CLevelDB) Stats() map[string]string {
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keys := []string{
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"leveldb.aliveiters",
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"leveldb.alivesnaps",
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"leveldb.blockpool",
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"leveldb.cachedblock",
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"leveldb.num-files-at-level{n}",
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"leveldb.openedtables",
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"leveldb.sstables",
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"leveldb.stats",
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}
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stats := make(map[string]string, len(keys))
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for _, key := range keys {
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str := db.db.PropertyValue(key)
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stats[key] = str
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}
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return stats
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}
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//----------------------------------------
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// Batch
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// Implements DB.
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func (db *CLevelDB) NewBatch() Batch {
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batch := levigo.NewWriteBatch()
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return &cLevelDBBatch{db, batch}
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}
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type cLevelDBBatch struct {
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db *CLevelDB
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batch *levigo.WriteBatch
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}
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// Implements Batch.
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func (mBatch *cLevelDBBatch) Set(key, value []byte) {
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mBatch.batch.Put(key, value)
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}
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// Implements Batch.
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func (mBatch *cLevelDBBatch) Delete(key []byte) {
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mBatch.batch.Delete(key)
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}
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// Implements Batch.
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func (mBatch *cLevelDBBatch) Write() {
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err := mBatch.db.db.Write(mBatch.db.wo, mBatch.batch)
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if err != nil {
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panic(err)
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}
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}
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// Implements Batch.
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func (mBatch *cLevelDBBatch) WriteSync() {
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err := mBatch.db.db.Write(mBatch.db.woSync, mBatch.batch)
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if err != nil {
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panic(err)
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}
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}
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// Implements Batch.
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func (mBatch *cLevelDBBatch) Close() {
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mBatch.batch.Close()
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}
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//----------------------------------------
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// Iterator
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// NOTE This is almost identical to db/go_level_db.Iterator
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// Before creating a third version, refactor.
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func (db *CLevelDB) Iterator(start, end []byte) Iterator {
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itr := db.db.NewIterator(db.ro)
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return newCLevelDBIterator(itr, start, end, false)
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}
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func (db *CLevelDB) ReverseIterator(start, end []byte) Iterator {
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itr := db.db.NewIterator(db.ro)
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return newCLevelDBIterator(itr, start, end, true)
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}
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var _ Iterator = (*cLevelDBIterator)(nil)
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type cLevelDBIterator struct {
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source *levigo.Iterator
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start, end []byte
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isReverse bool
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isInvalid bool
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}
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func newCLevelDBIterator(source *levigo.Iterator, start, end []byte, isReverse bool) *cLevelDBIterator {
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if isReverse {
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if end == nil {
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source.SeekToLast()
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} else {
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source.Seek(end)
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if source.Valid() {
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eoakey := source.Key() // end or after key
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if bytes.Compare(end, eoakey) <= 0 {
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source.Prev()
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}
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} else {
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source.SeekToLast()
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}
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}
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} else {
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if start == nil {
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source.SeekToFirst()
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} else {
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source.Seek(start)
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}
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}
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return &cLevelDBIterator{
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source: source,
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start: start,
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end: end,
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isReverse: isReverse,
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isInvalid: false,
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}
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}
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func (itr cLevelDBIterator) Domain() ([]byte, []byte) {
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return itr.start, itr.end
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}
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func (itr cLevelDBIterator) Valid() bool {
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// Once invalid, forever invalid.
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if itr.isInvalid {
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return false
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}
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// Panic on DB error. No way to recover.
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itr.assertNoError()
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// If source is invalid, invalid.
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if !itr.source.Valid() {
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itr.isInvalid = true
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return false
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}
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// If key is end or past it, invalid.
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var start = itr.start
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var end = itr.end
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var key = itr.source.Key()
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if itr.isReverse {
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if start != nil && bytes.Compare(key, start) < 0 {
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itr.isInvalid = true
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return false
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}
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} else {
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if end != nil && bytes.Compare(end, key) <= 0 {
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itr.isInvalid = true
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return false
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}
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}
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// It's valid.
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return true
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}
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func (itr cLevelDBIterator) Key() []byte {
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itr.assertNoError()
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itr.assertIsValid()
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return itr.source.Key()
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}
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func (itr cLevelDBIterator) Value() []byte {
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itr.assertNoError()
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itr.assertIsValid()
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return itr.source.Value()
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}
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func (itr cLevelDBIterator) Next() {
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itr.assertNoError()
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itr.assertIsValid()
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if itr.isReverse {
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itr.source.Prev()
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} else {
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itr.source.Next()
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}
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}
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func (itr cLevelDBIterator) Close() {
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itr.source.Close()
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}
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func (itr cLevelDBIterator) assertNoError() {
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if err := itr.source.GetError(); err != nil {
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panic(err)
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}
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}
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func (itr cLevelDBIterator) assertIsValid() {
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if !itr.Valid() {
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panic("cLevelDBIterator is invalid")
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}
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}
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