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262 lines
4.8 KiB
262 lines
4.8 KiB
package db
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import (
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"fmt"
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"path/filepath"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/errors"
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"github.com/syndtr/goleveldb/leveldb/iterator"
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"github.com/syndtr/goleveldb/leveldb/opt"
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. "github.com/tendermint/tmlibs/common"
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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 NewGoLevelDB(name, dir)
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}
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registerDBCreator(LevelDBBackendStr, dbCreator, false)
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registerDBCreator(GoLevelDBBackendStr, dbCreator, false)
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}
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var _ DB = (*GoLevelDB)(nil)
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type GoLevelDB struct {
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db *leveldb.DB
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}
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func NewGoLevelDB(name string, dir string) (*GoLevelDB, error) {
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dbPath := filepath.Join(dir, name+".db")
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db, err := leveldb.OpenFile(dbPath, nil)
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if err != nil {
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return nil, err
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}
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database := &GoLevelDB{
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db: db,
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}
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return database, nil
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}
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func (db *GoLevelDB) Get(key []byte) []byte {
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panicNilKey(key)
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res, err := db.db.Get(key, nil)
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if err != nil {
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if err == errors.ErrNotFound {
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return nil
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} else {
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PanicCrisis(err)
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}
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}
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return res
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}
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func (db *GoLevelDB) Has(key []byte) bool {
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panicNilKey(key)
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_, err := db.db.Get(key, nil)
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if err != nil {
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if err == errors.ErrNotFound {
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return false
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} else {
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PanicCrisis(err)
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}
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}
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return true
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}
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func (db *GoLevelDB) Set(key []byte, value []byte) {
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panicNilKey(key)
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err := db.db.Put(key, value, nil)
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if err != nil {
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PanicCrisis(err)
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}
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}
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func (db *GoLevelDB) SetSync(key []byte, value []byte) {
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panicNilKey(key)
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err := db.db.Put(key, value, &opt.WriteOptions{Sync: true})
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if err != nil {
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PanicCrisis(err)
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}
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}
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func (db *GoLevelDB) Delete(key []byte) {
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panicNilKey(key)
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err := db.db.Delete(key, nil)
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if err != nil {
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PanicCrisis(err)
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}
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}
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func (db *GoLevelDB) DeleteSync(key []byte) {
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panicNilKey(key)
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err := db.db.Delete(key, &opt.WriteOptions{Sync: true})
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if err != nil {
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PanicCrisis(err)
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}
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}
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func (db *GoLevelDB) DB() *leveldb.DB {
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return db.db
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}
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func (db *GoLevelDB) Close() {
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db.db.Close()
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}
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func (db *GoLevelDB) Print() {
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str, _ := db.db.GetProperty("leveldb.stats")
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fmt.Printf("%v\n", str)
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iter := db.db.NewIterator(nil, nil)
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for iter.Next() {
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key := iter.Key()
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value := iter.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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func (db *GoLevelDB) Stats() map[string]string {
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keys := []string{
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"leveldb.num-files-at-level{n}",
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"leveldb.stats",
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"leveldb.sstables",
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"leveldb.blockpool",
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"leveldb.cachedblock",
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"leveldb.openedtables",
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"leveldb.alivesnaps",
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"leveldb.aliveiters",
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}
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stats := make(map[string]string)
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for _, key := range keys {
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str, err := db.db.GetProperty(key)
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if err == nil {
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stats[key] = str
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}
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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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func (db *GoLevelDB) NewBatch() Batch {
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batch := new(leveldb.Batch)
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return &goLevelDBBatch{db, batch}
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}
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type goLevelDBBatch struct {
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db *GoLevelDB
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batch *leveldb.Batch
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}
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func (mBatch *goLevelDBBatch) Set(key, value []byte) {
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mBatch.batch.Put(key, value)
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}
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func (mBatch *goLevelDBBatch) Delete(key []byte) {
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mBatch.batch.Delete(key)
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}
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func (mBatch *goLevelDBBatch) Write() {
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err := mBatch.db.db.Write(mBatch.batch, nil)
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if err != nil {
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PanicCrisis(err)
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}
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}
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//----------------------------------------
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// Iterator
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func (db *GoLevelDB) Iterator(start, end []byte) Iterator {
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itr := db.db.NewIterator(nil, nil)
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if len(start) > 0 {
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itr.Seek(start)
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} else {
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itr.First()
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}
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return &goLevelDBIterator{
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source: itr,
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start: start,
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end: end,
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}
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}
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func (db *GoLevelDB) ReverseIterator(start, end []byte) Iterator {
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// XXX
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return nil
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}
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var _ Iterator = (*goLevelDBIterator)(nil)
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type goLevelDBIterator struct {
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source iterator.Iterator
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invalid bool
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start, end []byte
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}
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func (it *goLevelDBIterator) Domain() ([]byte, []byte) {
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return it.start, it.end
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}
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// Key returns a copy of the current key.
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func (it *goLevelDBIterator) Key() []byte {
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if !it.Valid() {
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panic("goLevelDBIterator Key() called when invalid")
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}
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key := it.source.Key()
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k := make([]byte, len(key))
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copy(k, key)
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return k
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}
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// Value returns a copy of the current value.
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func (it *goLevelDBIterator) Value() []byte {
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if !it.Valid() {
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panic("goLevelDBIterator Value() called when invalid")
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}
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val := it.source.Value()
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v := make([]byte, len(val))
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copy(v, val)
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return v
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}
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func (it *goLevelDBIterator) Valid() bool {
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it.assertNoError()
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if it.invalid {
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return false
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}
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it.invalid = !it.source.Valid()
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return !it.invalid
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}
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func (it *goLevelDBIterator) Next() {
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if !it.Valid() {
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panic("goLevelDBIterator Next() called when invalid")
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}
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it.source.Next()
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}
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func (it *goLevelDBIterator) Prev() {
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if !it.Valid() {
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panic("goLevelDBIterator Prev() called when invalid")
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}
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it.source.Prev()
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}
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func (it *goLevelDBIterator) Close() {
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it.source.Release()
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}
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func (it *goLevelDBIterator) Release() {
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it.source.Release()
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}
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func (it *goLevelDBIterator) assertNoError() {
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if err := it.source.Error(); err != nil {
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panic(err)
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}
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}
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