Class: Stacker::Stack

Inherits:
Object
  • Object
show all
Extended by:
Memoist
Defined in:
lib/stacker/stack.rb,
lib/stacker/stack/errors.rb,
lib/stacker/stack/template.rb,
lib/stacker/stack/component.rb,
lib/stacker/stack/parameters.rb,
lib/stacker/stack/capabilities.rb

Defined Under Namespace

Classes: Capabilities, Component, DoesNotExistError, Error, MissingParameters, Parameters, StackPolicyError, Template, TemplateSyntaxError, UpToDateError

Constant Summary collapse

CLIENT_METHODS = 
%w[
  creation_time
  description
  exists?
  last_updated_time
  status
  status_reason
]
SAFE_UPDATE_POLICY = 
<<-JSON
{
  "Statement" : [
    {
      "Effect" : "Deny",
      "Action" : ["Update:Replace", "Update:Delete"],
      "Principal" : "*",
      "Resource" : "*"
    },
    {
      "Effect" : "Allow",
      "Action" : "Update:*",
      "Principal" : "*",
      "Resource" : "*"
    }
  ]
}
JSON

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(region, name, options = {}) ⇒ Stack

Returns a new instance of Stack.



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# File 'lib/stacker/stack.rb', line 46

def initialize region, name, options = {}
  @region, @name, @options = region, name, options
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/stacker/stack.rb', line 44

def name
  @name
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/stacker/stack.rb', line 44

def options
  @options
end

#region ⇒ Object (readonly)

Returns the value of attribute region.



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# File 'lib/stacker/stack.rb', line 44

def region
  @region
end

Instance Method Details

#capabilities ⇒ Object 



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# File 'lib/stacker/stack.rb', line 69

def capabilities
  @capabilities ||= Capabilities.new self
end

#client ⇒ Object 



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# File 'lib/stacker/stack.rb', line 50

def client
  @client ||= region.client.stacks[name]
end

#create(blocking = true) ⇒ Object 



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# File 'lib/stacker/stack.rb', line 80

def create blocking = true
  if exists?
    Stacker.logger.warn 'Stack already exists'
    return
  end

  if parameters.missing.any?
    raise MissingParameters.new(
      "Required parameters missing: #{parameters.missing.join ', '}"
    )
  end

  Stacker.logger.info 'Creating stack'

  region.client.stacks.create(
    name,
    template.local,
    parameters: parameters.resolved,
    capabilities: capabilities.local
  )

  wait_while_status 'CREATE_IN_PROGRESS' if blocking
rescue AWS::CloudFormation::Errors::ValidationError => err
  raise Error.new err.message
end

#outputs ⇒ Object 



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# File 'lib/stacker/stack.rb', line 73

def outputs
  @outputs ||= begin
    return {} unless complete?
    Hash[client.outputs.map { |output| [ output.key, output.value ] }]
  end
end

#parameters ⇒ Object 



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# File 'lib/stacker/stack.rb', line 65

def parameters
  @parameters ||= Parameters.new self
end

#template ⇒ Object 



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# File 'lib/stacker/stack.rb', line 61

def template
  @template ||= Template.new self
end

#update(options = {}) ⇒ Object 



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# File 'lib/stacker/stack.rb', line 106

def update options = {}
  options.assert_valid_keys(:blocking, :allow_destructive)

  blocking = options.fetch(:blocking, true)
  allow_destructive = options.fetch(:allow_destructive, false)

  if parameters.missing.any?
    raise MissingParameters.new(
      "Required parameters missing: #{parameters.missing.join ', '}"
    )
  end

  Stacker.logger.info 'Updating stack'

  update_params = {
    template: template.local,
    parameters: parameters.resolved,
    capabilities: capabilities.local
  }

  unless allow_destructive
    update_params[:stack_policy_during_update_body] = SAFE_UPDATE_POLICY
  end

  client.update(update_params)

  wait_while_status 'UPDATE_IN_PROGRESS' if blocking
rescue AWS::CloudFormation::Errors::ValidationError => err
  case err.message
  when /does not exist/
    raise DoesNotExistError.new err.message
  when /No updates/
    raise UpToDateError.new err.message
  else
    raise Error.new err.message
  end
end