Class: Low::Adapter::SinatraAdapter

Inherits:
Low::AdapterInterface show all
Defined in:
lib/adapters/sinatra_adapter.rb

Overview

We don’t use sinatrarb.com/extensions.html because we need to type check all Ruby methods (not just Sinatra) at a lower level.

Instance Method Summary collapse

Instance Method Details

#module(file_path:) ⇒ Object

rubocop:disable Metrics/AbcSize



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# File 'lib/adapters/sinatra_adapter.rb', line 14

def module(file_path:) # rubocop:disable Metrics/AbcSize
  Module.new do
    @@file_path = file_path # rubocop:disable Style/ClassVars

    # Unfortunately overriding invoke() is the best way to validate types for now. Though direct it's also very compute efficient.
    # I originally tried an after filter and it mostly worked but it only had access to Response which isn't the raw return value.
    # I suggest that Sinatra provide a hook that allows us to access the raw return value of a route before it becomes a Response.
    def invoke(&block)
      res = catch(:halt, &block)

      lowtype_validate!(value: res) if res

      res = [res] if res.is_a?(Integer) || res.is_a?(String)
      if res.is_a?(::Array) && res.first.is_a?(Integer)
        res = res.dup
        status(res.shift)
        body(res.pop)
        headers(*res)
      elsif res.respond_to? :each
        body res
      end

      nil # avoid double setting the same response tuple twice
    end

    def lowtype_validate!(value:)
      route = "#{request.request_method} #{request.path}"
      if (method_proxy = Lowkey[@@file_path][self.class.name][route]) && (proxy = method_proxy.return_proxy)
        proxy.expression.validate!(value:, proxy:)
      end
    end
  end
end