lib/coach/middleware_validator.rb in coach-0.2.1 vs lib/coach/middleware_validator.rb in coach-0.2.2

- old
+ new

@@ -1,36 +1,42 @@ require "coach/errors" module Coach class MiddlewareValidator - def initialize(middleware, already_provided = []) + def initialize(middleware, previous_middlewares = [], already_provided = []) @middleware = middleware + @previous_middlewares = previous_middlewares.clone @already_provided = already_provided end # Aggregates provided keys from the given middleware, and all the middleware it uses. # Can raise at any level assuming a used middleware is missing a required dependency. def validated_provides! if missing_requirements.any? raise Coach::Errors::MiddlewareDependencyNotMet.new( - @middleware, missing_requirements + @middleware, @previous_middlewares, missing_requirements ) end @middleware.provided + provided_by_chain end private + attr_reader :previous_middlewares + def missing_requirements @middleware.requirements - provided_by_chain end def provided_by_chain - @provided_by_chain ||= - middleware_dependencies.reduce(@already_provided) do |provided, middleware| - provided + self.class.new(middleware, provided).validated_provides! - end.flatten.uniq + @provided_by_chain ||= begin + initial = [@already_provided, @previous_middlewares] + middleware_dependencies.reduce(initial) do |(provided, previous), middleware| + validator = self.class.new(middleware, previous, provided) + [provided + validator.validated_provides!, previous + [middleware]] + end.first.flatten.uniq + end end def middleware_dependencies @middleware_dependencies ||= @middleware.middleware_dependencies.map(&:middleware) end