use a separate class for the context

lib/roy/base.rb

@@ -7,6 +7,7 @@
 
 # local dependencies
 require 'roy/version'
+require 'roy/context'
 
 module Roy
   Defaults = {allow: [:get], prefix: :'', use: [:halt]}
@@ -16,26 +17,11 @@ def self.included(base)
   end
 
   def roy
-    @roy ||= OpenStruct.new.tap {|r|
-      r.app  = self
-      r.conf = self.class.conf
-      self.class.ancestors.reverse.each do |mod|
-        mod.setup(r) if mod.respond_to?(:setup)
-      end
-    }
+    @roy ||= Context.new(self)
   end
 
   def call(env)
-    roy.tap { |r|
-      r.env      = env
-      r.request  = Rack::Request.new(env)
-      r.response = Rack::Response.new
-      r.headers  = r.response.header
-      r.params   = r.request.GET.merge(r.request.POST)
-      r.params.default_proc = proc do |hash, key|
-        hash[key.to_s] if Symbol === key
-      end
-    }
+    roy.prepare!(env)
 
     method = roy.env['REQUEST_METHOD'].downcase.to_sym
     roy.env['PATH_INFO'].sub!(/^([^\/])/, '/\1')

lib/roy/context.rb

@@ -0,0 +1,25 @@
+module Roy
+  class Context
+    attr_reader :app, :conf, :env, :request, :response, :headers, :params
+
+    def initialize(app)
+      @app  = app
+      @conf = app.class.conf
+
+      app.class.ancestors.reverse.each do |mod|
+        mod.setup(self) if mod.respond_to?(:setup)
+      end
+    end
+
+    def prepare!(env)
+      @env      = env
+      @request  = Rack::Request.new(env)
+      @response = Rack::Response.new
+      @headers  = @response.header
+      @params   = @request.GET.merge(@request.POST)
+      @params.default_proc = proc do |hash, key|
+        hash[key.to_s] if Symbol === key
+      end
+    end
+  end
+end