Class: Utopia::Controller

Inherits:
Object
  • Object
show all
Defined in:
lib/utopia/controller.rb,
lib/utopia/controller/base.rb,
lib/utopia/controller/action.rb,
lib/utopia/controller/rewrite.rb,
lib/utopia/controller/variables.rb

Defined Under Namespace

Modules: Rewrite Classes: Action, Base, RewriteError, Variables

Constant Summary collapse

CONTROLLER_RB = 
'controller.rb'.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app, **options) ⇒ Controller

Returns a new instance of Controller.



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# File 'lib/utopia/controller.rb', line 49

def initialize(app, **options)
  @app = app
  @root = options[:root] || Utopia::default_root
  
  if options[:cache_controllers]
    @controller_cache = Concurrent::Map.new
  else
    @controller_cache = nil
  end
  
  self.freeze
end

Instance Attribute Details

#app ⇒ Object (readonly)

Returns the value of attribute app.



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# File 'lib/utopia/controller.rb', line 62

def app
  @app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/utopia/controller.rb', line 140

def call(env)
  env[VARIABLES_KEY] ||= Variables.new
  
  request = Rack::Request.new(env)
  
  if result = invoke_controllers(request)
    return result
  end
  
  return @app.call(env)
end

#freeze ⇒ Object 



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# File 'lib/utopia/controller.rb', line 64

def freeze
  @root.freeze
  
  super
end

#invoke_controllers(request) ⇒ Object 



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# File 'lib/utopia/controller.rb', line 112

def invoke_controllers(request)
  relative_path = Path[request.path_info]
  controller_path = Path.new
  variables = request.env[VARIABLES_KEY]
  
  while relative_path.components.any?
    controller_path.components << relative_path.components.shift
    
    if controller = lookup_controller(controller_path)
      # Don't modify the original controller:
      controller = controller.clone
      
      # Append the controller to the set of controller variables, updates the controller with all current instance variables.
      variables << controller
      
      if result = controller.process!(request, relative_path)
        return result
      end
    end
  end
  
  # The controllers may have rewriten the path so we update the path info:
  request.env[Rack::PATH_INFO] = controller_path.to_s
  
  # No controller gave a useful result:
  return nil
end

#load_controller_file(uri_path) ⇒ Object 



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# File 'lib/utopia/controller.rb', line 80

def load_controller_file(uri_path)
  base_path = File.join(@root, uri_path.components)
  
  controller_path = File.join(base_path, CONTROLLER_RB)
  # puts "load_controller_file(#{path.inspect}) => #{controller_path}"
  
  if File.exist?(controller_path)
    klass = Class.new(Base)
    
    # base_path is expected to be a string representing a filesystem path:
    klass.const_set(:BASE_PATH, base_path.freeze)
    
    # uri_path is expected to be an instance of Path:
    klass.const_set(:URI_PATH, uri_path.dup.freeze)
    
    klass.const_set(:CONTROLLER, self)
    
    klass.class_eval(File.read(controller_path), controller_path)
    
    # Give the controller a useful name:
    # Controllers.define(klass)
    
    # We lock down the controller class to prevent unsafe modifications:
    klass.freeze
    
    # Create an instance of the controller:
    return klass.new
  else
    return nil
  end
end

#lookup_controller(path) ⇒ Object 



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# File 'lib/utopia/controller.rb', line 70

def lookup_controller(path)
  if @controller_cache
    @controller_cache.fetch_or_store(path.to_s) do
      load_controller_file(path)
    end
  else
    load_controller_file(path)
  end
end