How to get tokio-io async_read for a File descriptor

I want to pass lines from a file descriptor and I have no idea how to satisfy the heck attachment that File

has 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));

    }
}

      

        
        
        
      

    

Mistake:

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`

      

        
        
        
      

    

Looking back at AsyncRead

, it seems that File

doesn't mean it has non-blocking reads. Do I need to downgrade File

to raw_fd

and then do something?