You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: stat.rs
    path of file: ./repos/CYFS/src/component/cyfs-backup/src/uni_backup
    
    the code of the file until where you have to start completion: use crate::meta::*;
use cyfs_base::*;
use cyfs_lib::*;

pub struct UniBackupStat {
    noc: NamedObjectCacheRef,
    ndc: NamedDataCacheRef,
}

impl UniBackupStat {
    pub fn new(noc: NamedObjectCacheRef, ndc: NamedDataCacheRef) -> Self {
        Self { noc, ndc }
    }

    pub async fn stat(&self) -> BuckyResult<ObjectArchiveDataMetas> {
        let stat = sel
    
    pub async fn stat(&self) -> BuckyResult<ObjectArchiveDataMetas> {
        let stat = self.noc.stat().await?;
        let objects = ObjectArchiveDataMeta {
            count: stat.count,
            bytes: 0,
        };

        let stat = self.ndc.stat().await?;
        let chunks = ObjectArchiveDataMeta {
            count: stat.count,
            bytes: 0,
        };

        let stat = ObjectArchiveDataMetas { objects, chunks };
        Ok(stat)
    }