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cache.go
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cache.go
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package cachefile
import (
"os"
"sync"
"time"
"github.com/chwjbn/xclash/component/profile"
C "github.com/chwjbn/xclash/constant"
"github.com/chwjbn/xclash/log"
"go.etcd.io/bbolt"
)
var (
initOnce sync.Once
fileMode os.FileMode = 0o666
defaultCache *CacheFile
bucketSelected = []byte("selected")
bucketFakeip = []byte("fakeip")
)
// CacheFile store and update the cache file
type CacheFile struct {
DB *bbolt.DB
}
func (c *CacheFile) SetSelected(group, selected string) {
if !profile.StoreSelected.Load() {
return
} else if c.DB == nil {
return
}
err := c.DB.Batch(func(t *bbolt.Tx) error {
bucket, err := t.CreateBucketIfNotExists(bucketSelected)
if err != nil {
return err
}
return bucket.Put([]byte(group), []byte(selected))
})
if err != nil {
log.Warnln("[CacheFile] write cache to %s failed: %s", c.DB.Path(), err.Error())
return
}
}
func (c *CacheFile) SelectedMap() map[string]string {
if !profile.StoreSelected.Load() {
return nil
} else if c.DB == nil {
return nil
}
mapping := map[string]string{}
c.DB.View(func(t *bbolt.Tx) error {
bucket := t.Bucket(bucketSelected)
if bucket == nil {
return nil
}
c := bucket.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
mapping[string(k)] = string(v)
}
return nil
})
return mapping
}
func (c *CacheFile) PutFakeip(key, value []byte) error {
if c.DB == nil {
return nil
}
err := c.DB.Batch(func(t *bbolt.Tx) error {
bucket, err := t.CreateBucketIfNotExists(bucketFakeip)
if err != nil {
return err
}
return bucket.Put(key, value)
})
if err != nil {
log.Warnln("[CacheFile] write cache to %s failed: %s", c.DB.Path(), err.Error())
}
return err
}
func (c *CacheFile) DelFakeipPair(ip, host []byte) error {
if c.DB == nil {
return nil
}
err := c.DB.Batch(func(t *bbolt.Tx) error {
bucket, err := t.CreateBucketIfNotExists(bucketFakeip)
if err != nil {
return err
}
err = bucket.Delete(ip)
if len(host) > 0 {
if err := bucket.Delete(host); err != nil {
return err
}
}
return err
})
if err != nil {
log.Warnln("[CacheFile] write cache to %s failed: %s", c.DB.Path(), err.Error())
}
return err
}
func (c *CacheFile) GetFakeip(key []byte) []byte {
if c.DB == nil {
return nil
}
tx, err := c.DB.Begin(false)
if err != nil {
return nil
}
defer tx.Rollback()
bucket := tx.Bucket(bucketFakeip)
if bucket == nil {
return nil
}
return bucket.Get(key)
}
func (c *CacheFile) Close() error {
return c.DB.Close()
}
func initCache() {
options := bbolt.Options{Timeout: time.Second}
db, err := bbolt.Open(C.Path.Cache(), fileMode, &options)
switch err {
case bbolt.ErrInvalid, bbolt.ErrChecksum, bbolt.ErrVersionMismatch:
if err = os.Remove(C.Path.Cache()); err != nil {
log.Warnln("[CacheFile] remove invalid cache file error: %s", err.Error())
break
}
log.Infoln("[CacheFile] remove invalid cache file and create new one")
db, err = bbolt.Open(C.Path.Cache(), fileMode, &options)
}
if err != nil {
log.Warnln("[CacheFile] can't open cache file: %s", err.Error())
}
defaultCache = &CacheFile{
DB: db,
}
}
// Cache return singleton of CacheFile
func Cache() *CacheFile {
initOnce.Do(initCache)
return defaultCache
}