/
store.go
97 lines (77 loc) · 1.79 KB
/
store.go
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package torrent
import (
"bytes"
"encoding/gob"
"time"
"github.com/anacrolix/dht/v2/bep44"
"github.com/dgraph-io/badger/v3"
dlog "github.com/distribyted/distribyted/log"
"github.com/rs/zerolog/log"
)
var _ bep44.Store = &FileItemStore{}
type FileItemStore struct {
ttl time.Duration
db *badger.DB
}
func NewFileItemStore(path string, itemsTTL time.Duration) (*FileItemStore, error) {
l := log.Logger.With().Str("component", "item-store").Logger()
opts := badger.DefaultOptions(path).
WithLogger(&dlog.Badger{L: l}).
WithValueLogFileSize(1<<26 - 1)
db, err := badger.Open(opts)
if err != nil {
return nil, err
}
err = db.RunValueLogGC(0.5)
if err != nil && err != badger.ErrNoRewrite {
return nil, err
}
return &FileItemStore{
db: db,
ttl: itemsTTL,
}, nil
}
func (fis *FileItemStore) Put(i *bep44.Item) error {
tx := fis.db.NewTransaction(true)
defer tx.Discard()
key := i.Target()
var value bytes.Buffer
enc := gob.NewEncoder(&value)
if err := enc.Encode(i); err != nil {
return err
}
e := badger.NewEntry(key[:], value.Bytes()).WithTTL(fis.ttl)
if err := tx.SetEntry(e); err != nil {
return err
}
return tx.Commit()
}
func (fis *FileItemStore) Get(t bep44.Target) (*bep44.Item, error) {
tx := fis.db.NewTransaction(false)
defer tx.Discard()
dbi, err := tx.Get(t[:])
if err == badger.ErrKeyNotFound {
return nil, bep44.ErrItemNotFound
}
if err != nil {
return nil, err
}
valb, err := dbi.ValueCopy(nil)
if err != nil {
return nil, err
}
buf := bytes.NewBuffer(valb)
dec := gob.NewDecoder(buf)
var i *bep44.Item
if err := dec.Decode(&i); err != nil {
return nil, err
}
return i, nil
}
func (fis *FileItemStore) Del(t bep44.Target) error {
// ignore this
return nil
}
func (fis *FileItemStore) Close() error {
return fis.db.Close()
}