class StackActionHandler(object):
def __init__(self, config, dry_run=False):
self.logger = get_logger(root=True)
self.config = config
self.cfn = CloudFormation(region=self.config.region, dry_run=dry_run)
self.parameter_resolver = ParameterResolver(self.cfn,
region=self.config.region)
self.cli_parameters = config.cli_params
def execute_change_set(self):
print('executing change set')
print(self.config.change_set)
change_set = self.cfn.get_change_set(self.config.change_set)
if change_set is None:
raise CfnStackActionFailedException(
"Could not execute change set {0}: Does not exist or is in an invalid state."
.format(self.config.change_set))
stack_name = self.cfn.get_stack_name_by_arn(change_set['StackId'])
stack = self.cfn.get_stack(stack_name)
if not self.cfn.change_set_is_executable(change_set):
raise CfnStackActionFailedException(
"Could not execute change set {0}: Does not exist or is in an invalid state."
.format(self.config.change_set))
else:
self.cfn.execute_change_set(stack, self.config.change_set)
def create_change_set(self):
existing_stacks = self.cfn.get_stack_names()
desired_stacks = self.config.stacks
stack_processing_order = DependencyResolver().get_stack_order(
desired_stacks)
if len(stack_processing_order) > 1:
self.logger.info(
"Will process stacks in the following order: {0}".format(
", ".join(stack_processing_order)))
for stack_name in stack_processing_order:
stack_config = self.config.stacks.get(stack_name)
if stack_config.stack_policy_url:
self.logger.info("Using stack policy from {0}".format(
stack_config.stack_policy_url))
stack_policy = FileLoader.get_yaml_or_json_file(
stack_config.stack_policy_url, stack_config.working_dir)
else:
stack_policy = None
template = TemplateHandler.get_template(
stack_config.template_url, stack_config.working_dir,
self.config.region, stack_config.package_bucket)
parameters = self.parameter_resolver.resolve_parameter_values(
stack_name, stack_config, self.cli_parameters)
stack = CloudFormationStack(
template=template,
parameters=parameters,
tags=stack_config.tags,
name=stack_name,
region=self.config.region,
timeout=stack_config.timeout,
service_role=stack_config.service_role,
stack_policy=stack_policy,
failure_action=stack_config.failure_action)
if stack_name in existing_stacks:
self.cfn.create_change_set(stack, 'UPDATE')
else:
self.cfn.create_change_set(stack, 'CREATE')
def create_or_update_stacks(self):
existing_stacks = self.cfn.get_stack_names()
desired_stacks = self.config.stacks
stack_processing_order = DependencyResolver().get_stack_order(
desired_stacks)
if len(stack_processing_order) > 1:
self.logger.info(
"Will process stacks in the following order: {0}".format(
", ".join(stack_processing_order)))
for stack_name in stack_processing_order:
stack_config = self.config.stacks.get(stack_name)
if stack_config.stack_policy_url:
self.logger.info("Using stack policy from {0}".format(
stack_config.stack_policy_url))
stack_policy = FileLoader.get_yaml_or_json_file(
stack_config.stack_policy_url, stack_config.working_dir)
else:
stack_policy = None
template = TemplateHandler.get_template(
stack_config.template_url, stack_config.working_dir,
self.config.region, stack_config.package_bucket)
parameters = self.parameter_resolver.resolve_parameter_values(
stack_name, stack_config, self.cli_parameters)
stack = CloudFormationStack(
template=template,
parameters=parameters,
tags=stack_config.tags,
name=stack_name,
region=self.config.region,
timeout=stack_config.timeout,
service_role=stack_config.service_role,
stack_policy=stack_policy,
failure_action=stack_config.failure_action)
if stack_name in existing_stacks:
self.cfn.validate_stack_is_ready_for_action(stack)
self.cfn.update_stack(stack)
else:
self.cfn.create_stack(stack)
def delete_stacks(self):
existing_stacks = self.cfn.get_stack_names()
stacks = self.config.stacks
stack_processing_order = DependencyResolver().get_stack_order(stacks)
stack_processing_order.reverse()
self.logger.info(
"Will delete stacks in the following order: {0}".format(
", ".join(stack_processing_order)))
for stack_name in stack_processing_order:
stack_config = self.config.stacks.get(stack_name)
if stack_name in existing_stacks:
stack = CloudFormationStack(
None,
None,
stack_name,
None,
None,
service_role=stack_config.service_role)
self.cfn.validate_stack_is_ready_for_action(stack)
self.cfn.delete_stack(stack)
else:
self.logger.info(
"Stack {0} is already deleted".format(stack_name))
