Class: Rage::Router::Backend

Inherits:
Object
  • Object
show all
Defined in:
lib/rage/router/backend.rb

Constant Summary collapse

OPTIONAL_PARAM_REGEXP = 
/\/?\(\/?(:\w+)\/?\)/
STRING_HANDLER_REGEXP = 
/^([a-z0-9_\/]+)#([a-z_]+)$/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Backend

Returns a new instance of Backend.



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# File 'lib/rage/router/backend.rb', line 11

def initialize
  @routes = []
  @trees = {}
  @constrainer = Rage::Router::Constrainer.new({})
end

Instance Attribute Details

#routes ⇒ Object (readonly)

Returns the value of attribute routes.



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# File 'lib/rage/router/backend.rb', line 6

def routes
  @routes
end

Instance Method Details

#lookup(env) ⇒ Object 



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# File 'lib/rage/router/backend.rb', line 98

def lookup(env)
  constraints = @constrainer.derive_constraints(env)
  find(env, constraints)
end

#mount(path, handler, methods) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/rage/router/backend.rb', line 22

def mount(path, handler, methods)
  raise ArgumentError, "Mount handler should respond to `call`" unless handler.respond_to?(:call)

  raw_handler = handler
  is_sidekiq = handler.respond_to?(:name) && handler.name == "Sidekiq::Web"

  handler = ->(env, _params) do
    env["SCRIPT_NAME"] = path
    sub_path = env["PATH_INFO"].delete_prefix!(path)
    env["PATH_INFO"] = "/" if sub_path == ""

    if is_sidekiq
      Rage::SidekiqSession.with_session(env) do
        raw_handler.call(env)
      end
    else
      raw_handler.call(env)
    end

  ensure
    env["PATH_INFO"] = "#{env["SCRIPT_NAME"]}#{sub_path}"
  end

  methods.each do |method|
    __on(method, path, handler, {}, {}, { raw_handler:, mount: true })
    __on(method, "#{path}/*", handler, {}, {}, { raw_handler:, mount: true })
  end
end

#on(method, path, handler, constraints: {}, defaults: nil) ⇒ Object 



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# File 'lib/rage/router/backend.rb', line 51

def on(method, path, handler, constraints: {}, defaults: nil)
  raise "Path could not be empty" if path&.empty?

  if (match_index = (path =~ OPTIONAL_PARAM_REGEXP))
    raise ArgumentError, "Optional Parameter has to be the last parameter of the path" if path.length != match_index + $&.length

    path_full = path.sub(OPTIONAL_PARAM_REGEXP, "/#{$1}")
    path_optional = path.sub(OPTIONAL_PARAM_REGEXP, "")

    on(method, path_full, handler, constraints: constraints, defaults: defaults)
    on(method, path_optional, handler, constraints: constraints, defaults: defaults)
    return
  end

  meta = { raw_handler: handler }

  if handler.is_a?(String)
    raise ArgumentError, "Invalid route handler format, expected to match the 'controller#action' pattern" unless handler =~ STRING_HANDLER_REGEXP

    controller, action = Rage::Router::Util.path_to_class($1), $2

    if controller.ancestors.include?(RageController::API)
      run_action_method_name = controller.__register_action(action.to_sym)

      meta[:controller] = $1
      meta[:action] = $2

      handler = eval("->(env, params) { #{controller}.new(env, params).#{run_action_method_name} }")
    else
      # this is a Rails controller; notify `Rage::Router::Util::Cascade` to forward the request to Rails
      handler = ->(_, _) { [404, { "X-Cascade" => "pass" }, []] }
    end
  else
    raise ArgumentError, "Non-string route handler should respond to `call`" unless handler.respond_to?(:call)
    # while regular handlers are expected to be called with the `env` and `params` objects,
    # lambda handlers expect just `env` as an argument;
    # TODO: come up with something nicer?
    orig_handler = handler
    handler = ->(env, _params) { orig_handler.call(env) }
  end

  __on(method, path, handler, constraints, defaults, meta)

rescue Rage::Errors::RouterError => e
  raise e unless Rage.code_loader.reloading?
end

#reset_routes ⇒ Object 



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# File 'lib/rage/router/backend.rb', line 17

def reset_routes
  @routes = []
  @trees = {}
end