class Async::HTTP::Middleware::Builder

def initialize(default_app = NotFound, &block)
	@use = []
	@app = default_app
	
	instance_eval(&block) if block_given?
end

def run(app)
	@app = app
end

def to_app
	@use.reverse.inject(@app) {|app, use| use.call(app).freeze}
end

def use(middleware, *args, &block)
	@use << proc {|app| middleware.new(app, *args, &block)}
end