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Contents
require 'json'
module Stackster
class StackUpdater
def initialize(args)
@config = args[:config]
@logger = @config.logger
@entry = args[:entry]
@name = args[:name]
@template_body = args[:template_body]
end
def update_stack_if_parameters_changed(attributes)
if parameter_updated?(attributes)
@logger.debug "Updated parameters found."
update
else
@logger.debug "No Cloud Formation parameters require updating."
false
end
end
private
def update
if status.wait_for_stable
@logger.info "Updating Cloud Formation stack #{@name}."
cloud_formation.update :name => @name,
:parameters => read_parameters_from_entry_attributes,
:template => @template_body
else
raise "#{@name} did not reach a stable state."
end
end
def parameter_updated?(attributes)
(template_parameters - updated_parameters(attributes)) != template_parameters
end
def template_parameters
json = JSON.parse @template_body
json['Parameters'].nil? ? [] : json['Parameters'].keys
end
def updated_parameters attributes
(attributes.map { |s| s.keys }).flatten
end
def read_parameters_from_entry_attributes
h = {}
entry_attributes = @entry.attributes
template_parameters.each do |p|
h[p] = entry_attributes[p] if entry_attributes[p]
end
h
end
def cloud_formation
@cloud_formation ||= AWS::CloudFormation.new :config => @config
end
def status
@status ||= Status.new :name => @name,
:config => @config
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems