/
stable_store.go
52 lines (45 loc) · 1.13 KB
/
stable_store.go
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package meles
import (
"encoding/binary"
"github.com/dgraph-io/badger"
"time"
)
type raftStableStore struct {
db *badger.DB
}
func (r raftStableStore) getKey(key []byte) []byte {
return append([]byte{metaPrefix_StableStore}, key...)
}
func (r *raftStableStore) Set(key []byte, val []byte) error {
txn := r.db.NewTransactionAt(uint64(time.Now().UnixNano()), true)
defer txn.Discard()
if err := txn.Set(r.getKey(key), val); err != nil {
return err
}
return txn.CommitAt(uint64(time.Now().UnixNano()), nil)
}
func (r *raftStableStore) Get(key []byte) (dst []byte, err error) {
err = r.db.View(func(txn *badger.Txn) error {
v, e := txn.Get(r.getKey(key))
if e == badger.ErrKeyNotFound {
return ErrNotFound
} else if e != nil {
return e
}
_, e = v.ValueCopy(dst)
return e
})
return dst, err
}
func (r *raftStableStore) SetUint64(key []byte, val uint64) error {
v := make([]byte, 8)
binary.BigEndian.PutUint64(v, val)
return r.Set(key, v)
}
func (r *raftStableStore) GetUint64(key []byte) (uint64, error) {
v, err := r.Get(key)
if err != nil || v == nil {
return 0, err
}
return binary.BigEndian.Uint64(v), nil
}