sing-box/experimental/cachefile/cache.go
2024-01-03 12:21:36 +08:00

260 lines
5.5 KiB
Go

package cachefile
import (
"context"
"errors"
"net/netip"
"os"
"strings"
"sync"
"time"
"github.com/sagernet/bbolt"
bboltErrors "github.com/sagernet/bbolt/errors"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing-box/option"
"github.com/sagernet/sing/common"
E "github.com/sagernet/sing/common/exceptions"
"github.com/sagernet/sing/service/filemanager"
)
var (
bucketSelected = []byte("selected")
bucketExpand = []byte("group_expand")
bucketMode = []byte("clash_mode")
bucketNameList = []string{
string(bucketSelected),
string(bucketExpand),
string(bucketMode),
}
cacheIDDefault = []byte("default")
)
var _ adapter.CacheFile = (*CacheFile)(nil)
type CacheFile struct {
ctx context.Context
path string
cacheID []byte
storeFakeIP bool
DB *bbolt.DB
saveAccess sync.RWMutex
saveDomain map[netip.Addr]string
saveAddress4 map[string]netip.Addr
saveAddress6 map[string]netip.Addr
saveMetadataTimer *time.Timer
}
func New(ctx context.Context, options option.CacheFileOptions) *CacheFile {
var path string
if options.Path != "" {
path = options.Path
} else {
path = "cache.db"
}
var cacheIDBytes []byte
if options.CacheID != "" {
cacheIDBytes = append([]byte{0}, []byte(options.CacheID)...)
}
return &CacheFile{
ctx: ctx,
path: filemanager.BasePath(ctx, path),
cacheID: cacheIDBytes,
storeFakeIP: options.StoreFakeIP,
saveDomain: make(map[netip.Addr]string),
saveAddress4: make(map[string]netip.Addr),
saveAddress6: make(map[string]netip.Addr),
}
}
func (c *CacheFile) start() error {
const fileMode = 0o666
options := bbolt.Options{Timeout: time.Second}
var (
db *bbolt.DB
err error
)
for i := 0; i < 10; i++ {
db, err = bbolt.Open(c.path, fileMode, &options)
if err == nil {
break
}
if errors.Is(err, bboltErrors.ErrTimeout) {
continue
}
if E.IsMulti(err, bboltErrors.ErrInvalid, bboltErrors.ErrChecksum, bboltErrors.ErrVersionMismatch) {
rmErr := os.Remove(c.path)
if rmErr != nil {
return err
}
}
time.Sleep(100 * time.Millisecond)
}
if err != nil {
return err
}
err = filemanager.Chown(c.ctx, c.path)
if err != nil {
db.Close()
return E.Cause(err, "platform chown")
}
err = db.Batch(func(tx *bbolt.Tx) error {
return tx.ForEach(func(name []byte, b *bbolt.Bucket) error {
if name[0] == 0 {
return b.ForEachBucket(func(k []byte) error {
bucketName := string(k)
if !(common.Contains(bucketNameList, bucketName)) {
_ = b.DeleteBucket(name)
}
return nil
})
} else {
bucketName := string(name)
if !(common.Contains(bucketNameList, bucketName) || strings.HasPrefix(bucketName, fakeipBucketPrefix)) {
_ = tx.DeleteBucket(name)
}
}
return nil
})
})
if err != nil {
db.Close()
return err
}
c.DB = db
return nil
}
func (c *CacheFile) PreStart() error {
return c.start()
}
func (c *CacheFile) Start() error {
return nil
}
func (c *CacheFile) Close() error {
if c.DB == nil {
return nil
}
return c.DB.Close()
}
func (c *CacheFile) StoreFakeIP() bool {
return c.storeFakeIP
}
func (c *CacheFile) LoadMode() string {
var mode string
c.DB.View(func(t *bbolt.Tx) error {
bucket := t.Bucket(bucketMode)
if bucket == nil {
return nil
}
var modeBytes []byte
if len(c.cacheID) > 0 {
modeBytes = bucket.Get(c.cacheID)
} else {
modeBytes = bucket.Get(cacheIDDefault)
}
mode = string(modeBytes)
return nil
})
return mode
}
func (c *CacheFile) StoreMode(mode string) error {
return c.DB.Batch(func(t *bbolt.Tx) error {
bucket, err := t.CreateBucketIfNotExists(bucketMode)
if err != nil {
return err
}
if len(c.cacheID) > 0 {
return bucket.Put(c.cacheID, []byte(mode))
} else {
return bucket.Put(cacheIDDefault, []byte(mode))
}
})
}
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)
}
func (c *CacheFile) LoadSelected(group string) string {
var selected string
c.DB.View(func(t *bbolt.Tx) error {
bucket := c.bucket(t, bucketSelected)
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)
if err != nil {
return err
}
return bucket.Put([]byte(group), []byte(selected))
})
}
func (c *CacheFile) LoadGroupExpand(group string) (isExpand bool, loaded bool) {
c.DB.View(func(t *bbolt.Tx) error {
bucket := c.bucket(t, bucketExpand)
if bucket == nil {
return nil
}
expandBytes := bucket.Get([]byte(group))
if len(expandBytes) == 1 {
isExpand = expandBytes[0] == 1
loaded = true
}
return nil
})
return
}
func (c *CacheFile) StoreGroupExpand(group string, isExpand bool) error {
return c.DB.Batch(func(t *bbolt.Tx) error {
bucket, err := c.createBucket(t, bucketExpand)
if err != nil {
return err
}
if isExpand {
return bucket.Put([]byte(group), []byte{1})
} else {
return bucket.Put([]byte(group), []byte{0})
}
})
}