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Contents
require "aws-sdk-cloudformation"
module Cfn
module AwsService
def cfn
@cfn ||= Aws::CloudFormation::Client.new
end
def stack_exists?(stack_name)
return true if ENV['TEST']
return false if @options[:noop]
exist = nil
begin
# When the stack does not exist an exception is raised. Example:
# Aws::CloudFormation::Errors::ValidationError: Stack with id blah does not exist
cfn.describe_stacks(stack_name: stack_name)
exist = true
rescue Aws::CloudFormation::Errors::ValidationError => e
if e.message =~ /does not exist/
exist = false
elsif e.message.include?("'stackName' failed to satisfy constraint")
# Example of e.message when describe_stack with invalid stack name
# "1 validation error detected: Value 'instance_and_route53' at 'stackName' failed to satisfy constraint: Member must satisfy regular expression pattern: [a-zA-Z][-a-zA-Z0-9]*|arn:[-a-zA-Z0-9:/._+]*"
puts "Invalid stack name: #{stack_name}"
puts "Full error message: #{e.message}"
exit 1
else
raise # re-raise exception because unsure what other errors can happen
end
end
exist
end
def find_stack(stack_name)
resp = cfn.describe_stacks(stack_name: stack_name)
resp.stacks.first
rescue Aws::CloudFormation::Errors::ValidationError => e
# example: Stack with id demo-web does not exist
if e.message =~ /Stack with/ && e.message =~ /does not exist/
nil
else
raise
end
end
def rollback_complete?(stack)
stack.stack_status == 'ROLLBACK_COMPLETE'
end
end
end
Version data entries
5 entries across 5 versions & 2 rubygems