RackInjection

This very simple gem just provides a middleware named RackInjection that allows you to inject arbitrary key-value pairs into the Rack env on every request.

You know how to install gems...

In your config.ru file:

use RackInjection, 'rack.logger' => my_special_logger

Now env['rack.logger'] will refer to my_special_logger in every request.

If send me a pull request, I promise I'll look at it.