[Mojolicious] Approach for pushing a series of file operations into non-blocking callback

[Charlie Brady]

I'm starting on the task of converting a preforking server into a 
non-blocking server for a small webservice. One of my handlers generates a 
data structure by reading the content of a subtree of files.

In essense, it does something like this:

...
    my $data = {
         map { $_ => Mojo::Util::slurp("/path/to/files/$_" }
            (qw(one two three four));
    };
    $c->render(json => $data);
};

Can someone give me some hints as to how to do that as a series of 
non-blocking callbacks, or do we just shrug and say "it's not going to 
block for too long".

Thanks