file - 如何为文件句柄获取 tokio-io 的 async_read

Question

我想从文件句柄中流式传输行，但我不知道如何满足 aFile具有的特征界限async_read：

use std::fs::File;
use std::io::{ BufReader, BufRead };
use tokio_core::reactor::Handle;
use tokio_io::io::lines;
use tokio_io::AsyncRead;

struct DockerLog {
    path: String
}

impl DockerLog {
    pub fn new(path: String) -> DockerLog {
        DockerLog {
            path: path
        }
    }
    pub fn read_lines(&self, handle: &Handle) {
        let file : File = File::open(&self.path[..]).unwrap();
        let l = lines(BufReader::new(file));

    }
}

错误：

error[E0277]: the trait bound `std::fs::File: tokio_io::AsyncRead` is not satisfied
  --> src/container/docker_logs.rs:20:17
   |
20 |         let l = lines(BufReader::new(file));
   |                 ^^^^^ the trait `tokio_io::AsyncRead` is not implemented for `std::fs::File`
   |
   = note: required because of the requirements on the impl of `tokio_io::AsyncRead` for `std::io::BufReader<std::fs::File>`
   = note: required by `tokio_io::io::lines`

查看AsyncRead，似乎 aFile没有标记它具有非阻塞读取。我需要降级File到 araw_fd然后在那里做点什么吗？