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