Class: ActionController::Routing::RouteSet

Inherits:
Object
  • Object
show all
Defined in:
lib/action_controller/routing/route_set.rb,
lib/action_controller/routing/recognition_optimisation.rb

Overview

BEFORE: 0.191446860631307 ms/url AFTER: 0.029847304022858 ms/url Speed up: 6.4 times

Route recognition is slow due to one-by-one iterating over a whole routeset (each map.resources generates at least 14 routes) and matching weird regexps on each step.

We optimize this by skipping all URI segments that 100% sure can’t be matched, moving deeper in a tree of routes (where node == segment) until first possible match is accured. In such case, we start walking a flat list of routes, matching them with accurate matcher. So, first step: search a segment tree for the first relevant index. Second step: iterate routes starting with that index.

How tree is walked? We can do a recursive tests, but it’s smarter: We just create a tree of if-s and elsif-s matching segments.

We have segments of 3 flavors: 1) nil (no segment, route finished) 2) const-dot-dynamic (like “/posts.:xml”, “/preview.:size.jpg”) 3) const (like “/posts”, “/comments”) 4) dynamic (“/:id”, “file.:size.:extension”)

We split incoming string into segments and iterate over them. When segment is nil, we drop immediately, on a current node index. When segment is equal to some const, we step into branch. If none constants matched, we step into ‘dynamic’ branch (it’s a last). If we can’t match anything, we drop to last index on a level.

Note: we maintain the original routes order, so we finish building

steps on a first dynamic segment.

Example. Given the routes:

0 /posts/
1 /posts/:id
2 /posts/:id/comments
3 /posts/blah
4 /users/
5 /users/:id
6 /users/:id/profile

request_uri = /users/123

There will be only 4 iterations:

1) segm test for /posts prefix, skip all /posts/* routes
2) segm test for /users/
3) segm test for /users/:id
   (jump to list index = 5)
4) full test for /users/:id => here we are!

Defined Under Namespace

Classes: Mapper, NamedRouteCollection

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ RouteSet

Returns a new instance of RouteSet.



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# File 'lib/action_controller/routing/route_set.rb', line 194

def initialize
  self.routes = []
  self.named_routes = NamedRouteCollection.new
end

Instance Attribute Details

#configuration_file ⇒ Object

Returns the value of attribute configuration_file.



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# File 'lib/action_controller/routing/route_set.rb', line 192

def configuration_file
  @configuration_file
end

#named_routes ⇒ Object

Returns the value of attribute named_routes.



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# File 'lib/action_controller/routing/route_set.rb', line 192

def named_routes
  @named_routes
end

#routes ⇒ Object

Returns the value of attribute routes.



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# File 'lib/action_controller/routing/route_set.rb', line 192

def routes
  @routes
end

Instance Method Details

#add_named_route(name, path, options = {}) ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 266

def add_named_route(name, path, options = {})
  # TODO - is options EVER used?
  name = options[:name_prefix] + name.to_s if options[:name_prefix]
  named_routes[name.to_sym] = add_route(path, options)
end

#add_route(path, options = {}) ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 260

def add_route(path, options = {})
  route = builder.build(path, options)
  routes << route
  route
end

#build_expiry(options, recall) ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 290

def build_expiry(options, recall)
  recall.inject({}) do |expiry, (key, recalled_value)|
    expiry[key] = (options.key?(key) && options[key].to_param != recalled_value.to_param)
    expiry
  end
end

#builder ⇒ Object

Subclasses and plugins may override this method to specify a different RouteBuilder instance, so that other route DSL’s can be created.



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# File 'lib/action_controller/routing/route_set.rb', line 201

def builder
  @builder ||= RouteBuilder.new
end

#clear! ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 211

def clear!
  routes.clear
  named_routes.clear
  @combined_regexp = nil
  @routes_by_controller = nil
  # This will force routing/recognition_optimization.rb
  # to refresh optimisations.
  @compiled_recognize_optimized = nil
end

#draw {|Mapper.new(self)| ... } ⇒ Object

Yields:



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# File 'lib/action_controller/routing/route_set.rb', line 205

def draw
  clear!
  yield Mapper.new(self)
  install_helpers
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/action_controller/routing/route_set.rb', line 226

def empty?
  routes.empty?
end

#extra_keys(options, recall = {}) ⇒ Object

Generate the path indicated by the arguments, and return an array of the keys that were not used to generate it.



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# File 'lib/action_controller/routing/route_set.rb', line 299

def extra_keys(options, recall={})
  generate_extras(options, recall).last
end

#extract_request_environment(request) ⇒ Object

Subclasses and plugins may override this method to extract further attributes from the request, for use by route conditions and such.



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# File 'lib/action_controller/routing/route_set.rb', line 430

def extract_request_environment(request)
  { :method => request.method }
end

#generate(options, recall = {}, method = :generate) ⇒ Object

Raises:



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# File 'lib/action_controller/routing/route_set.rb', line 307

def generate(options, recall = {}, method=:generate)
  named_route_name = options.delete(:use_route)
  generate_all = options.delete(:generate_all)
  if named_route_name
    named_route = named_routes[named_route_name]
    options = named_route.parameter_shell.merge(options)
  end

  options = options_as_params(options)
  expire_on = build_expiry(options, recall)

  if options[:controller]
    options[:controller] = options[:controller].to_s
  end
  # if the controller has changed, make sure it changes relative to the
  # current controller module, if any. In other words, if we're currently
  # on admin/get, and the new controller is 'set', the new controller
  # should really be admin/set.
  if !named_route && expire_on[:controller] && options[:controller] && options[:controller][0] != ?/
    old_parts = recall[:controller].split('/')
    new_parts = options[:controller].split('/')
    parts = old_parts[0..-(new_parts.length + 1)] + new_parts
    options[:controller] = parts.join('/')
  end

  # drop the leading '/' on the controller name
  options[:controller] = options[:controller][1..-1] if options[:controller] && options[:controller][0] == ?/
  merged = recall.merge(options)

  if named_route
    path = named_route.generate(options, merged, expire_on)
    if path.nil?
      raise_named_route_error(options, named_route, named_route_name)
    else
      return path
    end
  else
    merged[:action] ||= 'index'
    options[:action] ||= 'index'

    controller = merged[:controller]
    action = merged[:action]

    raise RoutingError, "Need controller and action!" unless controller && action

    if generate_all
      # Used by caching to expire all paths for a resource
      return routes.collect do |route|
        route.send!(method, options, merged, expire_on)
      end.compact
    end

    # don't use the recalled keys when determining which routes to check
    routes = routes_by_controller[controller][action][options.keys.sort_by { |x| x.object_id }]

    routes.each do |route|
      results = route.send!(method, options, merged, expire_on)
      return results if results && (!results.is_a?(Array) || results.first)
    end
  end

  raise RoutingError, "No route matches #{options.inspect}"
end

#generate_code(list, padding = ' ', level = 0) ⇒ Object 



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# File 'lib/action_controller/routing/recognition_optimisation.rb', line 112

def generate_code(list, padding='  ', level = 0)
  # a digit
  return padding + "#{list[0]}\n" if list.size == 1 && !(Array === list[0])

  body = padding + "(seg = segments[#{level}]; \n"

  i = 0
  was_nil = false
  list.each do |item|
    if Array === item
      i += 1
      start = (i == 1)
      final = (i == list.size)
      tag, sub = item
      if tag == :dynamic
        body += padding + "#{start ? 'if' : 'elsif'} true\n"
        body += generate_code(sub, padding + "  ", level + 1)
        break
      elsif tag == nil && !was_nil
        was_nil = true
        body += padding + "#{start ? 'if' : 'elsif'} seg.nil?\n"
        body += generate_code(sub, padding + "  ", level + 1)
      else
        body += padding + "#{start ? 'if' : 'elsif'} seg == '#{tag}'\n"
        body += generate_code(sub, padding + "  ", level + 1)
      end
    end
  end
  body += padding + "else\n"
  body += padding + "  #{list[0]}\n"
  body += padding + "end)\n"
  body
end

#generate_extras(options, recall = {}) ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 303

def generate_extras(options, recall={})
  generate(options, recall, :generate_extras)
end

#install_helpers(destinations = [ActionController::Base, ActionView::Base], regenerate_code = false) ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 221

def install_helpers(destinations = [ActionController::Base, ActionView::Base], regenerate_code = false)
  Array(destinations).each { |d| d.module_eval { include Helpers } }
  named_routes.install(destinations, regenerate_code)
end

#load! ⇒ Object Also known as: reload! 



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# File 'lib/action_controller/routing/route_set.rb', line 230

def load!
  Routing.use_controllers! nil # Clear the controller cache so we may discover new ones
  clear!
  load_routes!
  install_helpers
end

#load_routes! ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 251

def load_routes!
  if configuration_file
    load configuration_file
    @routes_last_modified = File.stat(configuration_file).mtime
  else
    add_route ":controller/:action/:id"
  end
end

#options_as_params(options) ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 272

def options_as_params(options)
  # If an explicit :controller was given, always make :action explicit
  # too, so that action expiry works as expected for things like
  #
  #   generate({:controller => 'content'}, {:controller => 'content', :action => 'show'})
  #
  # (the above is from the unit tests). In the above case, because the
  # controller was explicitly given, but no action, the action is implied to
  # be "index", not the recalled action of "show".
  #
  # great fun, eh?

  options_as_params = options.clone
  options_as_params[:action] ||= 'index' if options[:controller]
  options_as_params[:action] = options_as_params[:action].to_s if options_as_params[:action]
  options_as_params
end

#raise_named_route_error(options, named_route, named_route_name) ⇒ Object

try to give a helpful error message when named route generation fails



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# File 'lib/action_controller/routing/route_set.rb', line 372

def raise_named_route_error(options, named_route, named_route_name)
  diff = named_route.requirements.diff(options)
  unless diff.empty?
    raise RoutingError, "#{named_route_name}_url failed to generate from #{options.inspect}, expected: #{named_route.requirements.inspect}, diff: #{named_route.requirements.diff(options).inspect}"
  else
    required_segments = named_route.segments.select {|seg| (!seg.optional?) && (!seg.is_a?(DividerSegment)) }
    required_keys_or_values = required_segments.map { |seg| seg.key rescue seg.value } # we want either the key or the value from the segment
    raise RoutingError, "#{named_route_name}_url failed to generate from #{options.inspect} - you may have ambiguous routes, or you may need to supply additional parameters for this route.  content_url has the following required parameters: #{required_keys_or_values.inspect} - are they all satisfied?"
  end
end

#recognize(request) ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 383

def recognize(request)
  params = recognize_path(request.path, extract_request_environment(request))
  request.path_parameters = params.with_indifferent_access
  "#{params[:controller].camelize}Controller".constantize
end

#recognize_optimized(path, env) ⇒ Object 



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# File 'lib/action_controller/routing/recognition_optimisation.rb', line 71

def recognize_optimized(path, env)
  write_recognize_optimized
  recognize_optimized(path, env)
end

#recognize_path(path, environment = {}) ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 389

def recognize_path(path, environment={})
  raise "Not optimized! Check that routing/recognition_optimisation overrides RouteSet#recognize_path."
end

#reload ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 240

def reload
  if @routes_last_modified && configuration_file
    mtime = File.stat(configuration_file).mtime
    # if it hasn't been changed, then just return
    return if mtime == @routes_last_modified
    # if it has changed then record the new time and fall to the load! below
    @routes_last_modified = mtime
  end
  load!
end

#routes_by_controller ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 393

def routes_by_controller
  @routes_by_controller ||= Hash.new do |controller_hash, controller|
    controller_hash[controller] = Hash.new do |action_hash, action|
      action_hash[action] = Hash.new do |key_hash, keys|
        key_hash[keys] = routes_for_controller_and_action_and_keys(controller, action, keys)
      end
    end
  end
end

#routes_for(options, merged, expire_on) ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 403

def routes_for(options, merged, expire_on)
  raise "Need controller and action!" unless controller && action
  controller = merged[:controller]
  merged = options if expire_on[:controller]
  action = merged[:action] || 'index'

  routes_by_controller[controller][action][merged.keys]
end

#routes_for_controller_and_action(controller, action) ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 412

def routes_for_controller_and_action(controller, action)
  selected = routes.select do |route|
    route.matches_controller_and_action? controller, action
  end
  (selected.length == routes.length) ? routes : selected
end

#routes_for_controller_and_action_and_keys(controller, action, keys) ⇒ Object 



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# File 'lib/action_controller/routing/route_set.rb', line 419

def routes_for_controller_and_action_and_keys(controller, action, keys)
  selected = routes.select do |route|
    route.matches_controller_and_action? controller, action
  end
  selected.sort_by do |route|
    (keys - route.significant_keys).length
  end
end

#segment_tree(routes) ⇒ Object 



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# File 'lib/action_controller/routing/recognition_optimisation.rb', line 93

def segment_tree(routes)
  tree = [0]

  i = -1
  routes.each do |route|
    i += 1
    # not fast, but runs only once
    segments = to_plain_segments(route.segments.inject("") { |str,s| str << s.to_s })

    node  = tree
    segments.each do |seg|
      seg = :dynamic if seg && seg[0] == ?:
      node << [seg, [i]] if node.empty? || node[node.size - 1][0] != seg
      node = node[node.size - 1][1]
    end
  end
  tree
end

#to_plain_segments(str) ⇒ Object

this must be really fast



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# File 'lib/action_controller/routing/recognition_optimisation.rb', line 147

def to_plain_segments(str)
  str = str.dup
  str.sub!(/^\/+/,'')
  str.sub!(/\/+$/,'')
  segments = str.split(/\.[^\/]+\/+|\/+|\.[^\/]+\Z/) # cut off ".format" also
  segments << nil
  segments
end

#write_recognize_optimized ⇒ Object 



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# File 'lib/action_controller/routing/recognition_optimisation.rb', line 76

def write_recognize_optimized
  tree = segment_tree(routes)
  body = generate_code(tree)
  instance_eval %{
    def recognize_optimized(path, env)
      segments = to_plain_segments(path)
      index = #{body}
      return nil unless index
      while index < routes.size
        result = routes[index].recognize(path, env) and return result
        index += 1
      end
      nil
    end
  }, __FILE__, __LINE__
end