sing-box/experimental/clashapi/cachefile/cache.go

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package cachefile
import (
"os"
"time"
"github.com/sagernet/sing-box/adapter"
"go.etcd.io/bbolt"
)
var bucketSelected = []byte("selected")
var _ adapter.ClashCacheFile = (*CacheFile)(nil)
type CacheFile struct {
DB *bbolt.DB
cacheID []byte
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}
func Open(path string, cacheID string) (*CacheFile, error) {
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const fileMode = 0o666
options := bbolt.Options{Timeout: time.Second}
db, err := bbolt.Open(path, fileMode, &options)
switch err {
case bbolt.ErrInvalid, bbolt.ErrChecksum, bbolt.ErrVersionMismatch:
if err = os.Remove(path); err != nil {
break
}
db, err = bbolt.Open(path, 0o666, &options)
}
if err != nil {
return nil, err
}
var cacheIDBytes []byte
if cacheID != "" {
cacheIDBytes = append([]byte{0}, []byte(cacheID)...)
}
return &CacheFile{db, cacheIDBytes}, nil
}
func (c *CacheFile) bucket(t *bbolt.Tx, key []byte) *bbolt.Bucket {
if c.cacheID == nil {
return t.Bucket(key)
}
bucket := t.Bucket(c.cacheID)
if bucket == nil {
return nil
}
return bucket.Bucket(key)
}
func (c *CacheFile) createBucket(t *bbolt.Tx, key []byte) (*bbolt.Bucket, error) {
if c.cacheID == nil {
return t.CreateBucketIfNotExists(key)
}
bucket, err := t.CreateBucketIfNotExists(c.cacheID)
if bucket == nil {
return nil, err
}
return bucket.CreateBucketIfNotExists(key)
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}
func (c *CacheFile) LoadSelected(group string) string {
var selected string
c.DB.View(func(t *bbolt.Tx) error {
bucket := c.bucket(t, bucketSelected)
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if bucket == nil {
return nil
}
selectedBytes := bucket.Get([]byte(group))
if len(selectedBytes) > 0 {
selected = string(selectedBytes)
}
return nil
})
return selected
}
func (c *CacheFile) StoreSelected(group, selected string) error {
return c.DB.Batch(func(t *bbolt.Tx) error {
bucket, err := c.createBucket(t, bucketSelected)
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if err != nil {
return err
}
return bucket.Put([]byte(group), []byte(selected))
})
}
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func (c *CacheFile) Close() error {
return c.DB.Close()
}