Class: Puppet::Util::Autoload

Inherits:
Object
  • Object
show all
Extended by:
Concurrent::Synchronized
Includes:
Concurrent::Synchronized
Defined in:
lib/puppet/util/autoload.rb

Overview

Autoload paths, either based on names or all at once.

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(obj, path) ⇒ Autoload

Returns a new instance of Autoload.

Raises:

  • (ArgumentError) 


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# File 'lib/puppet/util/autoload.rb', line 180

def initialize(obj, path)
  @path = path.to_s
  raise ArgumentError, _("Autoload paths cannot be fully qualified") if Puppet::Util.absolute_path?(@path)

  @object = obj
end

Class Attribute Details

.loaded ⇒ Object

Returns the value of attribute loaded.



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# File 'lib/puppet/util/autoload.rb', line 33

def loaded
  @loaded
end

Instance Attribute Details

#object ⇒ Object

Returns the value of attribute object.



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# File 'lib/puppet/util/autoload.rb', line 178

def object
  @object
end

#path ⇒ Object

Returns the value of attribute path.



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# File 'lib/puppet/util/autoload.rb', line 178

def path
  @path
end

Class Method Details

.changed?(name, env) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/puppet/util/autoload.rb', line 61

def changed?(name, env)
  name = cleanpath(name).chomp('.rb')
  return true unless loaded.include?(name)

  file, old_mtime = loaded[name]
  return true unless file == get_file(name, env)

  begin
    old_mtime.to_i != File.mtime(file).to_i
  rescue Errno::ENOENT
    true
  end
end

.cleanpath(path) ⇒ Object

Normalize a path. This converts ALT_SEPARATOR to SEPARATOR on Windows and eliminates unnecessary parts of a path.



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# File 'lib/puppet/util/autoload.rb', line 173

def cleanpath(path)
  Pathname.new(path).cleanpath.to_s
end

.files_in_dir(dir, path) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/puppet/util/autoload.rb', line 124

def files_in_dir(dir, path)
  dir = Pathname.new(Puppet::FileSystem.expand_path(dir))
  Dir.glob(File.join(dir, path, "*.rb")).collect do |file|
    Pathname.new(file).relative_path_from(dir).to_s
  end
end

.files_to_load(path, env) ⇒ Object 



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# File 'lib/puppet/util/autoload.rb', line 119

def files_to_load(path, env)
  search_directories(env).map { |dir| files_in_dir(dir, path) }.flatten.uniq
end

.gem_directories ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/puppet/util/autoload.rb', line 139

def gem_directories
  gem_source.directories
end

.gem_source ⇒ Object 



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# File 'lib/puppet/util/autoload.rb', line 35

def gem_source
  @gem_source ||= Puppet::Util::RubyGems::Source.new
end

.get_file(name, env) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Get the correct file to load for a given path returns nil if no file is found



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# File 'lib/puppet/util/autoload.rb', line 113

def get_file(name, env)
  name += '.rb' unless name =~ /\.rb$/
  path = search_directories(env).find { |dir| Puppet::FileSystem.exist?(File.join(dir, name)) }
  path and File.join(path, name)
end

.load_file(name, env) ⇒ Object

Load a single plugin by name. We use ‘load’ here so we can reload a given plugin.



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# File 'lib/puppet/util/autoload.rb', line 77

def load_file(name, env)
  file = get_file(name.to_s, env)
  return false unless file

  begin
    mark_loaded(name, file)
    Kernel.load file
    true
  rescue SystemExit, NoMemoryError
    raise
  rescue Exception => detail
    message = _("Could not autoload %{name}: %{detail}") % { name: name, detail: detail }
    Puppet.log_exception(detail, message)
    raise Puppet::Error, message, detail.backtrace
  end
end

.loadall(path, env) ⇒ Object 



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# File 'lib/puppet/util/autoload.rb', line 94

def loadall(path, env)
  # Load every instance of everything we can find.
  files_to_load(path, env).each do |file|
    name = file.chomp(".rb")
    load_file(name, env) unless loaded?(name)
  end
end

.loaded?(path) ⇒ Boolean

Has a given path been loaded? This is used for testing whether a changed file should be loaded or just ignored. This is only used in network/client/master, when downloading plugins, to see if a given plugin is currently loaded and thus should be reloaded.

Returns:

  • (Boolean) 


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# File 'lib/puppet/util/autoload.rb', line 44

def loaded?(path)
  path = cleanpath(path).chomp('.rb')
  loaded.include?(path)
end

.mark_loaded(name, file) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Save the fact that a given path has been loaded. This is so we can load downloaded plugins if they’ve already been loaded into memory.



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# File 'lib/puppet/util/autoload.rb', line 53

def mark_loaded(name, file)
  name = cleanpath(name).chomp('.rb')
  file = File.expand_path(file)
  $LOADED_FEATURES << file unless $LOADED_FEATURES.include?(file)
  loaded[name] = [file, File.mtime(file)]
end

.module_directories(env) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Raises:

  • (ArgumentError) 


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# File 'lib/puppet/util/autoload.rb', line 132

def module_directories(env)
  raise ArgumentError, "Autoloader requires an environment" unless env

  Puppet::Util::ModuleDirectoriesAdapter.adapt(env).directories
end

.reload_changed(env) ⇒ Object 



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# File 'lib/puppet/util/autoload.rb', line 102

def reload_changed(env)
  loaded.keys.each do |file|
    if changed?(file, env)
      load_file(file, env)
    end
  end
end

.search_directories(env) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/puppet/util/autoload.rb', line 144

def search_directories(env)
  # This is a little bit of a hack.  Basically, the autoloader is being
  # called indirectly during application bootstrapping when we do things
  # such as check "features".  However, during bootstrapping, we haven't
  # yet parsed all of the command line parameters nor the config files,
  # and thus we don't yet know with certainty what the module path is.
  # This should be irrelevant during bootstrapping, because anything that
  # we are attempting to load during bootstrapping should be something
  # that we ship with puppet, and thus the module path is irrelevant.
  #
  # In the long term, I think the way that we want to handle this is to
  # have the autoloader ignore the module path in all cases where it is
  # not specifically requested (e.g., by a constructor param or
  # something)... because there are very few cases where we should
  # actually be loading code from the module path.  However, until that
  # happens, we at least need a way to prevent the autoloader from
  # attempting to access the module path before it is initialized.  For
  # now we are accomplishing that by calling the
  # "app_defaults_initialized?" method on the main puppet Settings object.
  # --cprice 2012-03-16
  if Puppet.settings.app_defaults_initialized?
    gem_directories + module_directories(env) + $LOAD_PATH
  else
    gem_directories + $LOAD_PATH
  end
end

Instance Method Details

#changed?(name, env) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/puppet/util/autoload.rb', line 210

def changed?(name, env)
  self.class.changed?(expand(name), env)
end

#expand(name) ⇒ Object 



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# File 'lib/puppet/util/autoload.rb', line 218

def expand(name)
  ::File.join(@path, name.to_s)
end

#files_to_load(env) ⇒ Object 



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# File 'lib/puppet/util/autoload.rb', line 214

def files_to_load(env)
  self.class.files_to_load(@path, env)
end

#load(name, env) ⇒ Object 



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# File 'lib/puppet/util/autoload.rb', line 187

def load(name, env)
  self.class.load_file(expand(name), env)
end

#loadall(env) ⇒ Object

Load all instances from a path of Autoload.search_directories matching the relative path this Autoloader was initialized with. For example, if we have created a Puppet::Util::Autoload for Puppet::Type::User with a path of ‘puppet/provider/user’, the search_directories path will be searched for all ruby files matching puppet/provider/user/*.rb and they will then be loaded from the first directory in the search path providing them. So earlier entries in the search path may shadow later entries.

This uses require, rather than load, so that already-loaded files don’t get reloaded unnecessarily.



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# File 'lib/puppet/util/autoload.rb', line 201

def loadall(env)
  self.class.loadall(@path, env)
end

#loaded?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/util/autoload.rb', line 205

def loaded?(name)
  self.class.loaded?(expand(name))
end