hyper operation Controller Operation experimental patch

controller_op.rb

# app/hyperloop/operations/controller_op.rb

# make sure to also require 'operations/controller_op' 
# at the *END* of config/initializers/hyperloop.rb

module Hyperloop
  
  # monkey patch HyperloopController to pass controller instance from controller method to ServerOp
        
  Engine.routes.append do

    class HyperloopController < ::ApplicationController
      def execute_remote
        parsed_params = JSON.parse(params[:json]).symbolize_keys
        render ServerOp.run_from_client(
          :acting_user, 
          self,  # this gets added
          parsed_params[:operation], 
          parsed_params[:params].merge(acting_user: acting_user)
        )
      end
    
      def execute_remote_api
        params.require(:params).permit!
        parsed_params = params[:params].to_h.symbolize_keys
        raise AccessViolation unless parsed_params[:authorization]
        # likewise add self here as second param
        render ServerOp.run_from_client(:authorization, self, params[:operation], parsed_params)
      end
    end
  end unless RUBY_ENGINE == 'opal'
  
  # monkey patch run_from_client so it accepts controller
  
  class ServerOp < Operation
    def self.run_from_client(security_param, controller, operation, params)
      operation.constantize.class_eval do
        # if the params expect a controller then merge it in
        # and if we are passing in a controller then we can ignore the security param
        if _Railway.params_wrapper.method_defined?(:controller)
          params[:controller] = controller
        # but if we are not passing a controller, then we must have th security param defined
        elsif !_Railway.params_wrapper.method_defined?(security_param)
          raise AccessViolation
        end
        run(params)
        .then { |r| return { json: { response: serialize_response(r) } } }
        .fail { |e| return { json: { error: e}, status: 500 } }
      end
    rescue Exception => e
      { json: {error: e}, status: 500 }
    end
  end unless RUBY_ENGINE == 'opal'
  
  # at this point you can add a controller param to a ServerOp and you will be able to use it
  # but to make things nice we will define a subclass that already takes the controller
  # and then make the Operation act like a Controller delegate
  
  class ControllerOp < ServerOp; end
  class ControllerOp < ServerOp
    param :controller
    alias pre_controller_op_method_missing method_missing
    def method_missing(name, *args, &block)
      if params.controller.respond_to? name
        params.controller.send(name, *args, &block)
      else
        pre_controller_op_method_missing(name, *args, &block)
      end
    end
  end unless RUBY_ENGINE == 'opal'
end

get_session_id.rb

# example Operation using ControllerOp subclass

require 'operations/controller_op'

class GetSessionId < Hyperloop::ControllerOp
  step { session.delete 'hyperloop-dummy-init' unless session.id }
  step { session.id }
end