How to use pry to access a Rack middleware instance?

I'm new to using Pry, and try as I might, I can't find the right commands to access a rack middleware instance that's being run with a Sinatra app. I've set binding.pry in the part of the app where I have an error, but the problem is with a helper that's returning no results, and it gets the results from info put in the env by the middleware. I tried cding into Rack::GeoIPCity, but it didn't give me access to any instance info.

So, I can check the locals, the helper, and the env - how do I get to the middleware from the Sinatra app's code?

e.g.

class App < Sinatra::Base
  # inside the Sinatra app
  use Rack::GeoIPCity, :db => File.expand_path( File.join(File.dirname(__FILE__), "assets/GeoLiteCity.dat"))

  def geo_city_info
    h = {}
    env.select{|x| x =~ /^GEOIP/ }.each {|k,v|
      h[k.split("GEOIP_").last.downcase] = v
    }
    OpenStruct.new( h )
  end

  get "/home" do
    geo = geo_city_info
    binding.pry
  end

end

so at the point where binding.pry is called I can easily access geo, env (which is a helper provided by Sinatra to Rack's env), and I could easily add a binding inside the geo_city_info if I wanted. But, I can't access the Rack::GeoIPCity from those bindings. I'm hoping there's a command that could help me navigate to that, because it must be part of the loaded application code.

Of course, I can open up the code files for the middleware and put in the pry binding (as I install all dependent libs into /vendor using Bundler), but it'd be much better if I knew how to do this without resorting to that.

Solution

Not sure what you are trying to do, but you can

Monkey patch the middleware class to use pry inside
connect directly from the source code (what I understood you dont want)
play around with the "use" method from Sinatra to access the middleware you want from the middleware stack

That are my ideas, hope it helps

AFTER YOUR EDITED:

Check out this, you can access the @middleware instance variable to get the used middlewares