kv

type Base interface {
	Txn
	// RunInTxn runs the user provided function in a Transaction.
	// If user provided function f returns a non-nil error, then
	// transaction will not be committed, the same error will be
	// returned by RunInTxn.
	// Otherwise, it returns the error occurred during the
	// transaction.
	// Note that transaction are not committed until RunInTxn returns nil.
	// Note:
	// 1. Load and LoadRange operations provides only stale read.
	// Values saved/ removed during transaction will not be immediately
	// observable in the same transaction.
	// 2. Only when storage is etcd, does RunInTxn checks that
	// values loaded during transaction has not been modified before commit.
	RunInTxn(ctx context.Context, f func(txn Txn) error) error
}

type LevelDBKV struct {
	*leveldb.DB
}

type SlowLogTxn struct {
	clientv3.Txn
	// contains filtered or unexported fields
}

type Txn interface {
	Save(key, value string) error
	Remove(key string) error
	Load(key string) (string, error)
	LoadRange(key, endKey string, limit int) (keys []string, values []string, err error)
}