status-go/vendor/github.com/anacrolix/torrent/storage/bolt-piece-completion.go

98 lines
1.9 KiB
Go
Raw Normal View History

2022-03-10 09:44:48 +00:00
//go:build !noboltdb && !wasm
// +build !noboltdb,!wasm
package storage
import (
"encoding/binary"
"os"
"path/filepath"
"time"
"go.etcd.io/bbolt"
"github.com/anacrolix/torrent/metainfo"
)
const (
boltDbCompleteValue = "c"
boltDbIncompleteValue = "i"
)
var completionBucketKey = []byte("completion")
type boltPieceCompletion struct {
db *bbolt.DB
}
var _ PieceCompletion = (*boltPieceCompletion)(nil)
func NewBoltPieceCompletion(dir string) (ret PieceCompletion, err error) {
os.MkdirAll(dir, 0o750)
p := filepath.Join(dir, ".torrent.bolt.db")
db, err := bbolt.Open(p, 0o660, &bbolt.Options{
Timeout: time.Second,
})
if err != nil {
return
}
db.NoSync = true
ret = &boltPieceCompletion{db}
return
}
func (me boltPieceCompletion) Get(pk metainfo.PieceKey) (cn Completion, err error) {
err = me.db.View(func(tx *bbolt.Tx) error {
cb := tx.Bucket(completionBucketKey)
if cb == nil {
return nil
}
ih := cb.Bucket(pk.InfoHash[:])
if ih == nil {
return nil
}
var key [4]byte
binary.BigEndian.PutUint32(key[:], uint32(pk.Index))
cn.Ok = true
switch string(ih.Get(key[:])) {
case boltDbCompleteValue:
cn.Complete = true
case boltDbIncompleteValue:
cn.Complete = false
default:
cn.Ok = false
}
return nil
})
return
}
func (me boltPieceCompletion) Set(pk metainfo.PieceKey, b bool) error {
if c, err := me.Get(pk); err == nil && c.Ok && c.Complete == b {
return nil
}
return me.db.Update(func(tx *bbolt.Tx) error {
c, err := tx.CreateBucketIfNotExists(completionBucketKey)
if err != nil {
return err
}
ih, err := c.CreateBucketIfNotExists(pk.InfoHash[:])
if err != nil {
return err
}
var key [4]byte
binary.BigEndian.PutUint32(key[:], uint32(pk.Index))
return ih.Put(key[:], []byte(func() string {
if b {
return boltDbCompleteValue
} else {
return boltDbIncompleteValue
}
}()))
})
}
func (me *boltPieceCompletion) Close() error {
return me.db.Close()
}