How to asynchronously read a file?

Question

I could create a separate thread to act as an I/O queue, but I'm not sure whether this is the best way. It looks like the best.

I do not know how to load a local file with mio.

Answer 1

Use tokio::fs::read:

use tokio::prelude::Future;

fn main() {
    let task = tokio::fs::read("/proc/cpuinfo").map(|data| {
        // do something with the contents of the file ...
        println!("contains {} bytes", data.len());
        println!("{:?}", String::from_utf8(data));
    }).map_err(|e| {
        // handle errors
        eprintln!("IO error: {:?}", e);
    });
    tokio::run(task);
}