Class: Chef::ResourceCollection::ResourceSet

Inherits:
Object
  • Object
show all
Includes:
ResourceCollectionSerialization
Defined in:
lib/chef/resource_collection/resource_set.rb

Constant Summary collapse

MULTIPLE_RESOURCE_MATCH =

Matches a multiple resource lookup specification, e.g., “service”

/^(.+)\[(.+?),(.+)\]$/
SINGLE_RESOURCE_MATCH =

Matches a single resource lookup specification, e.g., “service”

/^(.+)\[(.+)\]$/

Instance Method Summary collapse

Methods included from ResourceCollectionSerialization

included, #is_chef_resource!, #to_hash, #to_json

Constructor Details

#initialize ⇒ ResourceSet

Returns a new instance of ResourceSet.



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# File 'lib/chef/resource_collection/resource_set.rb', line 35

def initialize
  @resources_by_key = Hash.new
end

Instance Method Details

#find(*args) ⇒ Object Also known as: resources

Find existing resources by searching the list of existing resources. Possible forms are:

find(:file => “foobar”) find(:file => [ “foobar”, “baz” ]) find(“file”, “file”) find(“file”)

Returns the matching resource, or an Array of matching resources.

Raises an ArgumentError if you feed it bad lookup information Raises a Runtime Error if it can’t find the resources you are looking for.



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# File 'lib/chef/resource_collection/resource_set.rb', line 80

def find(*args)
  results = Array.new
  args.each do |arg|
    case arg
      when Hash
        results << find_resource_by_hash(arg)
      when String
        results << find_resource_by_string(arg)
      else
        msg = "arguments to #{self.class.name}#find should be of the form :resource => 'name' or 'resource[name]'"
        raise Chef::Exceptions::InvalidResourceSpecification, msg
    end
  end
  flat_results = results.flatten
  flat_results.length == 1 ? flat_results[0] : flat_results
end

#insert_as(resource, resource_type = nil, instance_name = nil) ⇒ Object 



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# File 'lib/chef/resource_collection/resource_set.rb', line 43

def insert_as(resource, resource_type = nil, instance_name = nil)
  is_chef_resource!(resource)
  resource_type ||= resource.resource_name
  instance_name ||= resource.name
  key = create_key(resource_type, instance_name)
  @resources_by_key[key] = resource
end

#keys ⇒ Object 



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# File 'lib/chef/resource_collection/resource_set.rb', line 39

def keys
  @resources_by_key.keys
end

#lookup(key) ⇒ Object 



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# File 'lib/chef/resource_collection/resource_set.rb', line 51

def lookup(key)
  case
    when key.kind_of?(String)
      lookup_by = key
    when key.kind_of?(Chef::Resource)
      lookup_by = create_key(key.resource_name, key.name)
    else
      raise ArgumentError, "Must pass a Chef::Resource or String to lookup"
  end

  res = @resources_by_key[lookup_by]
  unless res
    raise Chef::Exceptions::ResourceNotFound, "Cannot find a resource matching #{lookup_by} (did you define it first?)"
  end
  res
end

#validate_lookup_spec!(query_object) ⇒ Object

Returns true if query_object is a valid string for looking up a resource, or raises InvalidResourceSpecification if not.

Arguments

  • query_object should be a string of the form

“resource_type”, a single element Hash (e.g., :service => “apache2”), or a Chef::Resource (this is the happy path). Other arguments will raise an exception.

Returns

  • true returns true for all valid input.

Raises

  • Chef::Exceptions::InvalidResourceSpecification for all invalid input.



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# File 'lib/chef/resource_collection/resource_set.rb', line 113

def validate_lookup_spec!(query_object)
  case query_object
    when Chef::Resource
      true
    when SINGLE_RESOURCE_MATCH, MULTIPLE_RESOURCE_MATCH
      true
    when Hash
      true
    when String
      raise Chef::Exceptions::InvalidResourceSpecification,
            "The string `#{query_object}' is not valid for resource collection lookup. Correct syntax is `resource_type[resource_name]'"
    else
      raise Chef::Exceptions::InvalidResourceSpecification,
            "The object `#{query_object.inspect}' is not valid for resource collection lookup. " +
        "Use a String like `resource_type[resource_name]' or a Chef::Resource object"
  end
end