What am I?

sinatra.rb

# What am I? A controller? A router?

class Foo < Sinatra::Base
  
  set :bar, Baz
  
  def self.both
    # aren't a composite object in denial?
    get '/glee' do
      'happy!'
    end
    put '/gloom' do
      'gloom :('
    end
  end
  
  before do
    # why am I here? (see below)
    @riz = params[:rep]
  end
  
  def qux
    # why am I here? I only apply to one of several paths
    # did I just mutate "global" state
    xyzzy(env)
  end
  
  def fud
    # aren't I part of the GET path's internal concerns?
    params[:fef] * 200
  end
  
  get '/' do
    # (see above) because there's no room for you here
    settings.bar.call(qux.merge(fud))
  end
  
  patch '/suf' do
    # here I am the last in line, maybe...
    309
  end
  
  ...
end

# Sinatra/Rack adopts a fractal, compositional style, passing around a hash of state
# There is no room for state in the captured procs
# Why not move it down to an enclosed object?

But those things aren't solvable without significantly changing the API or even approach. I also guess you use Sinatra differently than I do.