Class: Chef::Resource

Inherits:
Object show all
Extended by:
Mixin::ConvertToClassName
Includes:
Mixin::CheckHelper, Mixin::ConvertToClassName, Mixin::Language, Mixin::ParamsValidate
Defined in:
lib/chef/resource.rb,
lib/chef/resource/csh.rb,
lib/chef/resource/git.rb,
lib/chef/resource/scm.rb,
lib/chef/resource/bash.rb,
lib/chef/resource/cron.rb,
lib/chef/resource/file.rb,
lib/chef/resource/link.rb,
lib/chef/resource/perl.rb,
lib/chef/resource/ruby.rb,
lib/chef/resource/user.rb,
lib/chef/resource/group.rb,
lib/chef/resource/mdadm.rb,
lib/chef/resource/mount.rb,
lib/chef/resource/route.rb,
lib/chef/resource/deploy.rb,
lib/chef/resource/python.rb,
lib/chef/resource/script.rb,
lib/chef/resource/execute.rb,
lib/chef/resource/package.rb,
lib/chef/resource/service.rb,
lib/chef/resource/erl_call.rb,
lib/chef/resource/ifconfig.rb,
lib/chef/resource/template.rb,
lib/chef/resource/directory.rb,
lib/chef/resource/breakpoint.rb,
lib/chef/resource/ruby_block.rb,
lib/chef/resource/subversion.rb,
lib/chef/resource/apt_package.rb,
lib/chef/resource/gem_package.rb,
lib/chef/resource/remote_file.rb,
lib/chef/resource/dpkg_package.rb,
lib/chef/resource/http_request.rb,
lib/chef/resource/deploy_revision.rb,
lib/chef/resource/portage_package.rb,
lib/chef/resource/macports_package.rb,
lib/chef/resource/remote_directory.rb,
lib/chef/resource/timestamped_deploy.rb,
lib/chef/resource/easy_install_package.rb

Defined Under Namespace

Classes: AptPackage, Bash, Breakpoint, Cron, Csh, Deploy, DeployBranch, DeployRevision, Directory, DpkgPackage, EasyInstallPackage, ErlCall, Execute, File, GemPackage, Git, Group, HttpRequest, Ifconfig, Link, MacportsPackage, Mdadm, Mount, Package, Perl, PortagePackage, Python, RemoteDirectory, RemoteFile, Route, Ruby, RubyBlock, Scm, Script, Service, Subversion, Template, TimestampedDeploy, User

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Mixin::ConvertToClassName

convert_to_class_name, convert_to_snake_case, filename_to_qualified_string

Methods included from Mixin::Language

#data_bag, #data_bag_item, #platform?, #search, #value_for_platform

Methods included from Mixin::ParamsValidate

#set_or_return, #validate

Methods included from Mixin::CheckHelper

#set_if_args

Constructor Details

#initialize(name, collection = nil, node = nil) ⇒ Resource

Returns a new instance of Resource.



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# File 'lib/chef/resource.rb', line 38

def initialize(name, collection=nil, node=nil)
  @name = name
  if collection
    @collection = collection
  else
    @collection = Chef::ResourceCollection.new()
  end      
  @node = node ? node : Chef::Node.new
  @noop = nil
  @before = nil
  @actions = Hash.new
  @params = Hash.new
  @provider = nil
  @allowed_actions = [ :nothing ]
  @action = :nothing
  @updated = false
  @supports = {}
  @ignore_failure = false
  @not_if = nil
  @only_if = nil
  sline = caller(4).shift
  if sline
    @source_line = sline.gsub!(/^(.+):(.+):.+$/, '\1 line \2')
    @source_line = ::File.expand_path(@source_line) if @source_line
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_symbol, *args, &block) ⇒ Object

If an unknown method is invoked, determine whether the enclosing Provider’s lexical scope can fulfill the request. E.g. This happens when the Resource’s block invokes new_resource.



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# File 'lib/chef/resource.rb', line 68

def method_missing(method_symbol, *args, &block)
  if enclosing_provider && enclosing_provider.respond_to?(method_symbol)
    enclosing_provider.send(method_symbol, *args, &block)
  else
    raise NoMethodError, "undefined method `#{method_symbol.to_s}' for #{self.class.to_s}"
  end
end

Instance Attribute Details

#actions ⇒ Object

Returns the value of attribute actions.



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# File 'lib/chef/resource.rb', line 35

def actions
  @actions
end

#allowed_actions ⇒ Object

Returns the value of attribute allowed_actions.



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# File 'lib/chef/resource.rb', line 35

def allowed_actions
  @allowed_actions
end

#collection ⇒ Object

Returns the value of attribute collection.



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# File 'lib/chef/resource.rb', line 35

def collection
  @collection
end

#cookbook_name ⇒ Object

Returns the value of attribute cookbook_name.



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# File 'lib/chef/resource.rb', line 35

def cookbook_name
  @cookbook_name
end

#enclosing_provider ⇒ Object

Returns the value of attribute enclosing_provider.



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# File 'lib/chef/resource.rb', line 35

def enclosing_provider
  @enclosing_provider
end

#node ⇒ Object (readonly)

Returns the value of attribute node.



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# File 'lib/chef/resource.rb', line 36

def node
  @node
end

#params ⇒ Object

Returns the value of attribute params.



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# File 'lib/chef/resource.rb', line 35

def params
  @params
end

#provider(arg = nil) ⇒ Object

Returns the value of attribute provider.



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# File 'lib/chef/resource.rb', line 35

def provider
  @provider
end

#recipe_name ⇒ Object

Returns the value of attribute recipe_name.



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# File 'lib/chef/resource.rb', line 35

def recipe_name
  @recipe_name
end

#resource_name ⇒ Object (readonly)

Returns the value of attribute resource_name.



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# File 'lib/chef/resource.rb', line 36

def resource_name
  @resource_name
end

#source_line ⇒ Object (readonly)

Returns the value of attribute source_line.



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# File 'lib/chef/resource.rb', line 36

def source_line
  @source_line
end

#updated ⇒ Object

Returns the value of attribute updated.



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# File 'lib/chef/resource.rb', line 35

def updated
  @updated
end

Class Method Details

.attribute(attr_name, validation_opts = {}) ⇒ Object 



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# File 'lib/chef/resource.rb', line 258

def attribute(attr_name, validation_opts={})
  # This atrocity is the only way to support 1.8 and 1.9 at the same time
  # When you're ready to drop 1.8 support, do this:
  # define_method attr_name.to_sym do |arg=nil|
  # etc.
  shim_method=<<-SHIM
  def #{attr_name}(arg=nil)
    _set_or_return_#{attr_name}(arg)
  end
  SHIM
  class_eval(shim_method)
  
  define_method("_set_or_return_#{attr_name.to_s}".to_sym) do |arg|
    set_or_return(attr_name.to_sym, arg, validation_opts)
  end
end

.build_from_file(cookbook_name, filename) ⇒ Object 



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# File 'lib/chef/resource.rb', line 275

def build_from_file(cookbook_name, filename)
  rname = filename_to_qualified_string(cookbook_name, filename)
    
  new_resource_class = Class.new self do |cls|
    
    # default initialize method that ensures that when initialize is finally
    # wrapped (see below), super is called in the event that the resource
    # definer does not implement initialize
    def initialize(name, collection=nil, node=nil)
      super(name, collection, node)
    end
    
    @actions_to_create = []
    
    class << cls
      include Chef::Mixin::FromFile
      
      def actions_to_create
        @actions_to_create
      end
      
      define_method(:actions) do |*action_names|
        actions_to_create.push(*action_names)
      end
    end
    
    # load resource definition from file
    cls.class_from_file(filename)
    
    # create a new constructor that wraps the old one and adds the actions
    # specified in the DSL
    old_init = instance_method(:initialize)

    define_method(:initialize) do |name, *optional_args|
      collection = optional_args.shift
      node = optional_args.shift
      @resource_name = rname.to_sym
      old_init.bind(self).call(name, collection, node)
      allowed_actions.push(self.class.actions_to_create).flatten!
    end
  end
  
  # register new class as a Chef::Resource
  class_name = convert_to_class_name(rname)
  Chef::Resource.const_set(class_name, new_resource_class)
  Chef::Log.debug("Loaded contents of #{filename} into a resource named #{rname} defined in Chef::Resource::#{class_name}")
  
  new_resource_class
end

.json_create(o) ⇒ Object 



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# File 'lib/chef/resource.rb', line 248

def json_create(o)
  resource = self.new(o["instance_vars"]["@name"])
  o["instance_vars"].each do |k,v|
    resource.instance_variable_set(k.to_sym, v)
  end
  resource
end

.provider_base(arg = nil) ⇒ Object

Resources that want providers namespaced somewhere other than Chef::Provider can set the namespace with provider_base Ex:

class MyResource < Chef::Resource
  provider_base Chef::Provider::Deploy
  # ...other stuff
end



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# File 'lib/chef/resource.rb', line 332

def provider_base(arg=nil)
  @provider_base ||= arg
  @provider_base ||= Chef::Provider
end

Instance Method Details

#action(arg = nil) ⇒ Object 



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# File 'lib/chef/resource.rb', line 112

def action(arg=nil)
  if arg
    action_list = arg.kind_of?(Array) ? arg : [ arg ]
    action_list = action_list.collect { |a| a.to_sym }
    action_list.each do |action|
      validate(
        {
          :action => action,
        },
        {
          :action => { :kind_of => Symbol, :equal_to => @allowed_actions },
        }
      )
    end
    @action = action_list
  else
    @action
  end
end

#epic_fail(arg = nil) ⇒ Object 



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# File 'lib/chef/resource.rb', line 154

def epic_fail(arg=nil)
  ignore_failure(arg)
end

#ignore_failure(arg = nil) ⇒ Object 



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# File 'lib/chef/resource.rb', line 146

def ignore_failure(arg=nil)
  set_or_return(
    :ignore_failure,
    arg,
    :kind_of => [ TrueClass, FalseClass ]
  )
end

#is(*args) ⇒ Object 



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# File 'lib/chef/resource.rb', line 193

def is(*args)
  return *args
end

#load_prior_resource ⇒ Object 



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# File 'lib/chef/resource.rb', line 76

def load_prior_resource
  begin
    prior_resource = @collection.lookup(self.to_s)
    Chef::Log.debug("Setting #{self.to_s} to the state of the prior #{self.to_s}")
    prior_resource.instance_variables.each do |iv|
      unless iv == "@source_line" || iv == "@action"
        self.instance_variable_set(iv, prior_resource.instance_variable_get(iv))
      end
    end
    true
  rescue ArgumentError => e
    true
  end
end

#name(name = nil) ⇒ Object 



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# File 'lib/chef/resource.rb', line 132

def name(name=nil)
  set_if_args(@name, name) do
    raise ArgumentError, "name must be a string!" unless name.kind_of?(String)
    @name = name
  end
end

#noop(tf = nil) ⇒ Object 



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# File 'lib/chef/resource.rb', line 139

def noop(tf=nil)
  set_if_args(@noop, tf) do 
    raise ArgumentError, "noop must be true or false!" unless tf == true || tf == false
    @noop = tf
  end
end

#not_if(arg = nil, &blk) ⇒ Object 



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# File 'lib/chef/resource.rb', line 231

def not_if(arg=nil, &blk)
  if Kernel.block_given?
    @not_if = blk
  else
    @not_if = arg if arg
  end
  @not_if
end

#notifies(*args) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/chef/resource.rb', line 158

def notifies(*args)
  raise ArgumentError, "Wrong number of arguments (should be 1, 2, or 3)" unless ( args.size > 0 && args.size < 4)
  if args.size > 1
    notifies_helper(*args)
  else
    resources_array = *args
    resources_array.each do |resource|
      resource.each do |key, value|
        notifies_helper(value[0], key, value[1])    
      end
    end 
  end
end

#only_if(arg = nil, &blk) ⇒ Object 



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# File 'lib/chef/resource.rb', line 222

def only_if(arg=nil, &blk)
  if Kernel.block_given?
    @only_if = blk
  else
    @only_if = arg if arg
  end
  @only_if
end

#resources(*args) ⇒ Object 



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# File 'lib/chef/resource.rb', line 172

def resources(*args)
  @collection.resources(*args)
end

#run_action(action) ⇒ Object 



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# File 'lib/chef/resource.rb', line 240

def run_action(action)
  provider = Chef::Platform.provider_for_node(@node, self)
  provider.load_current_resource
  provider.send("action_#{action}")
end

#subscribes(action, resources, timing = :delayed) ⇒ Object 



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# File 'lib/chef/resource.rb', line 176

def subscribes(action, resources, timing=:delayed)
  timing = check_timing(timing)
  rarray = resources.kind_of?(Array) ? resources : [ resources ]
  rarray.each do |resource|
    action_sym = action.to_sym
    if resource.actions.has_key?(action_sym)
      resource.actions[action_sym][timing] << self
    else       
      resource.actions[action_sym] = Hash.new
      resource.actions[action_sym][:delayed] = Array.new
      resource.actions[action_sym][:immediate] = Array.new   
      resource.actions[action_sym][timing] << self
    end
  end
  true
end

#supports(args = {}) ⇒ Object 



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# File 'lib/chef/resource.rb', line 91

def supports(args={})
  if args.any?
    @supports = args
  else
    @supports
  end
end

#to_hash ⇒ Object 



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# File 'lib/chef/resource.rb', line 214

def to_hash
  instance_vars = Hash.new
  self.instance_variables.each do |iv|
    instance_vars[iv.sub(/^@/,'').to_sym] = self.instance_variable_get(iv) unless iv == "@collection"
  end
  instance_vars
end

#to_json(*a) ⇒ Object

Serialize this object as a hash



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# File 'lib/chef/resource.rb', line 202

def to_json(*a)
  instance_vars = Hash.new
  self.instance_variables.each do |iv|
    instance_vars[iv] = self.instance_variable_get(iv) unless iv == "@collection"
  end
  results = {
    'json_class' => self.class.name,
    'instance_vars' => instance_vars
  }
  results.to_json(*a)
end

#to_s ⇒ Object 



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# File 'lib/chef/resource.rb', line 197

def to_s
  "#{@resource_name}[#{@name}]"
end