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bitcask.go
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bitcask.go
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// Copyright 2022 MaoLongLong. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package bitcask
import (
"time"
"github.com/dgraph-io/ristretto/z"
"github.com/tidwall/match"
"go.chensl.me/bitcask"
"go.chensl.me/redix/server/internal/storage"
"go.chensl.me/redix/server/pkg/bytesconv"
"go.uber.org/zap"
)
type bitcaskStorage struct {
db *bitcask.DB
closer *z.Closer
logger *zap.Logger
}
func NewStorage(path string, logger *zap.Logger) (storage.Interface, error) {
db, err := bitcask.Open(path)
if err != nil {
return nil, err
}
s := &bitcaskStorage{
db: db,
closer: z.NewCloser(1),
logger: logger,
}
go s.gc()
return s, nil
}
func (s *bitcaskStorage) Keys(pattern string) ([][]byte, error) {
var keys [][]byte
err := s.db.ForEach(func(key, _ []byte) error {
keys = append(keys, key)
return nil
})
var filtered [][]byte
for _, k := range keys {
_, err := s.getEntry(k)
if err == storage.ErrNotExist {
continue
}
if err != nil {
return nil, err
}
if match.Match(bytesconv.BytesToString(k), pattern) {
filtered = append(filtered, k)
}
}
return filtered, err
}
func (s *bitcaskStorage) Del(keys ...[]byte) (int, error) {
if len(keys) == 0 {
return 0, nil
}
var cnt int
for _, k := range keys {
err := s.db.Delete(k)
if err == bitcask.ErrNotExist {
continue
}
if err != nil {
return cnt, err
}
cnt++
}
return cnt, nil
}
func (s *bitcaskStorage) DropAll() error {
return s.db.DropAll()
}
func (s *bitcaskStorage) Expire(key []byte, dur time.Duration) error {
if dur <= 0 {
return storage.ErrInvalidOpts
}
entry, err := s.getEntry(key)
if err != nil {
return err
}
entry.ExpiresAt = time.Now().Add(dur).Unix()
return s.putEntry(key, entry)
}
func (s *bitcaskStorage) TTL(key []byte) (int64, error) {
entry, err := s.getEntry(key)
if err == storage.ErrNotExist {
return -2, nil
}
if err != nil {
return 0, err
}
if entry.ExpiresAt > 0 {
return int64(time.Until(time.Unix(entry.ExpiresAt, 0)).Seconds()), nil
}
return -1, nil
}
func (s *bitcaskStorage) Close() error {
s.logger.Info("graceful shutdown...")
s.closer.SignalAndWait()
return s.db.Close()
}
func (s *bitcaskStorage) gc() {
defer s.closer.Done()
ticker := time.NewTicker(5 * time.Minute)
for {
select {
case <-s.closer.HasBeenClosed():
ticker.Stop()
return
case <-ticker.C:
}
if err := s.db.Reclaim(); err != nil {
s.logger.Error("failed to reclaim", zap.Error(err))
}
}
}