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store.go
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store.go
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package store
import (
"fmt"
"log"
badger "github.com/dgraph-io/badger/v4"
"github.com/mus-format/mus-go/varint"
)
var (
PrimaryKey = []byte("primary-key")
)
type Store struct {
db *badger.DB
pk *badger.Sequence
}
func New() *Store {
return new(Store)
}
func uint64ToBytes(v uint64) (bs []byte) {
size := varint.SizeUint64(v)
bs = make([]byte, size)
varint.MarshalUint64(v, bs)
return
}
func (s *Store) SetBytes(pk uint64, bytes []byte) error {
return s.db.Update(func(txn *badger.Txn) error {
e := badger.NewEntry(uint64ToBytes(pk), bytes)
err := txn.SetEntry(e)
return err
})
}
func (s *Store) GetBytes(pk uint64) (bytes []byte, err error) {
err = s.db.View(func(txn *badger.Txn) error {
item, err := txn.Get(uint64ToBytes(pk))
if err != nil {
return err
}
return item.Value(func(bs []byte) error {
bytes = append([]byte{}, bs...)
return nil
})
})
return
}
func (s *Store) PrimaryKey() (num uint64) {
var err error
if s.pk == nil {
s.pk, err = s.db.GetSequence(PrimaryKey, 1000)
if err != nil {
log.Panic(err)
}
}
retries := 10
for i := 0; i < retries; i++ {
num, err = s.pk.Next()
if err != nil {
fmt.Printf("WARN: s.pk.Next() error: %s\n", err)
s.pk, err = s.db.GetSequence(PrimaryKey, 1000)
if err != nil {
log.Panic(err)
}
} else {
break
}
}
return
}
func (s *Store) Connect(path string) (close func()) {
// Open the Badger database located in directory /path.
// It will be created if it doesn't exist.
opts := badger.DefaultOptions(path)
opts.IndexCacheSize = 100 << 20 // 100 mb
db, err := badger.Open(badger.DefaultOptions(path))
if err != nil {
log.Panic(err)
}
s.db = db
return func() {
if s.pk != nil {
s.pk.Release()
}
for {
err := s.db.RunValueLogGC(0.7)
if err != nil {
break
}
}
s.db.Close()
}
}