Class: Humidifier::Resource

Inherits:
Object
  • Object
show all
Defined in:
lib/humidifier/resource.rb

Overview

Superclass for all AWS resources

Constant Summary collapse

COMMON_ATTRIBUTES =

Attributes that are available to every stack

Utils.underscored(%w[Condition CreationPolicy DeletionPolicy DependsOn
Metadata UpdatePolicy])

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(properties = {}, raw = false) ⇒ Resource

Returns a new instance of Resource.



13
14
15
16
 
# File 'lib/humidifier/resource.rb', line 13

def initialize(properties = {}, raw = false)
  self.properties = {}
  update(properties, raw)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object

Patches method_missing to include property accessors After the first method call, builds the accessor methods to get a speed boost



21
22
23
24
25
26
27
28
29
30
31
 
# File 'lib/humidifier/resource.rb', line 21

def method_missing(name, *args)
  if !valid_accessor?(name)
    super
  elsif self.class.prop?(name.to_s)
    self.class.build_property_reader(name)
    send(name)
  else
    self.class.build_property_writer(name)
    send(name, args.first)
  end
end

Class Attribute Details

.aws_name ⇒ Object

Returns the value of attribute aws_name.



78
79
80
 
# File 'lib/humidifier/resource.rb', line 78

def aws_name
  @aws_name
end

.props ⇒ Object

Returns the value of attribute props.



78
79
80
 
# File 'lib/humidifier/resource.rb', line 78

def props
  @props
end

Class Method Details

.build_property_reader(name) ⇒ Object 



81
82
83
84
85
 
# File 'lib/humidifier/resource.rb', line 81

def build_property_reader(name)
  define_method(name) do
    properties[name.to_s]
  end
end

.build_property_writer(name) ⇒ Object 



88
89
90
91
92
 
# File 'lib/humidifier/resource.rb', line 88

def build_property_writer(name)
  define_method(name) do |value|
    update_property(name.to_s[0..-2], value)
  end
end

.prop?(prop) ⇒ Boolean

true if this resource has the given property

Returns:

  • (Boolean) 


95
96
97
 
# File 'lib/humidifier/resource.rb', line 95

def prop?(prop)
  props.key?(prop)
end

Instance Method Details

#respond_to_missing?(name) ⇒ Boolean

Patches respond_to_missing? to include property accessors

Returns:

  • (Boolean) 


34
35
36
 
# File 'lib/humidifier/resource.rb', line 34

def respond_to_missing?(name, *)
  valid_accessor?(name) || super
end

#to_cf ⇒ Object

CFN stack syntax



39
40
41
42
43
44
45
46
47
48
49
 
# File 'lib/humidifier/resource.rb', line 39

def to_cf
  props_cf =
    properties.map do |key, value|
      self.class.props[key].to_cf(value)
    end

  common_attributes.merge!(
    'Type' => self.class.aws_name,
    'Properties' => props_cf.to_h
  )
end

#update(properties, raw = false) ⇒ Object

Update a set of properties defined by the given properties hash



52
53
54
55
56
 
# File 'lib/humidifier/resource.rb', line 52

def update(properties, raw = false)
  properties.each do |property, value|
    update_property(property, value, raw)
  end
end

#update_attributes(attributes) ⇒ Object

Update the attributes of the resource defined by COMMON_ATTRIBUTES



59
60
61
62
63
64
65
66
67
 
# File 'lib/humidifier/resource.rb', line 59

def update_attributes(attributes)
  attributes.each do |attribute, value|
    unless COMMON_ATTRIBUTES.value?(attribute)
      raise ArgumentError, "Invalid attribute: #{attribute}"
    end

    public_send(:"#{attribute}=", value)
  end
end

#update_property(property, value, raw = false) ⇒ Object

Update an individual property on this resource



70
71
72
73
74
75
 
# File 'lib/humidifier/resource.rb', line 70

def update_property(property, value, raw = false)
  property = property.to_s
  property = validate_property(property, raw)
  value = validate_value(property, value, raw)
  properties[property] = value
end