def create_and_wait_for_changeset(self, stack_name, cfn_template,
parameter_values, capabilities, role_arn,
notification_arns, s3_uploader, tags):
try:
result, changeset_type = self.create_changeset(
stack_name, cfn_template, parameter_values, capabilities,
role_arn, notification_arns, s3_uploader, tags)
self.wait_for_changeset(result["Id"], stack_name)
self.describe_changeset(result["Id"], stack_name)
return result, changeset_type
except botocore.exceptions.ClientError as ex:
raise DeployFailedError(stack_name=stack_name, msg=str(ex)) from ex
def execute_changeset(self, changeset_id, stack_name):
"""
Calls CloudFormation to execute changeset
:param changeset_id: ID of the changeset
:param stack_name: Name or ID of the stack
:return: Response from execute-change-set call
"""
try:
return self._client.execute_change_set(ChangeSetName=changeset_id, StackName=stack_name)
except botocore.exceptions.ClientError as ex:
raise DeployFailedError(stack_name=stack_name, msg=str(ex))
def has_stack(self, stack_name):
"""
Checks if a CloudFormation stack with given name exists
:param stack_name: Name or ID of the stack
:return: True if stack exists. False otherwise
"""
try:
resp = self._client.describe_stacks(StackName=stack_name)
if not resp["Stacks"]:
return False
# When you run CreateChangeSet on a a stack that does not exist,
# CloudFormation will create a stack and set it's status
# REVIEW_IN_PROGRESS. However this stack is cannot be manipulated
# by "update" commands. Under this circumstances, we treat like
# this stack does not exist and call CreateChangeSet will
# ChangeSetType set to CREATE and not UPDATE.
stack = resp["Stacks"][0]
return stack["StackStatus"] != "REVIEW_IN_PROGRESS"
except botocore.exceptions.ClientError as e:
# If a stack does not exist, describe_stacks will throw an
# exception. Unfortunately we don't have a better way than parsing
# the exception msg to understand the nature of this exception.
if "Stack with id {0} does not exist".format(stack_name) in str(e):
LOG.debug("Stack with id %s does not exist", stack_name)
return False
except botocore.exceptions.BotoCoreError as e:
# If there are credentials, environment errors,
# catch that and throw a deploy failed error.
LOG.debug("Botocore Exception : %s", str(e))
raise DeployFailedError(stack_name=stack_name, msg=str(e)) from e
except Exception as e:
# We don't know anything about this exception. Don't handle
LOG.debug("Unable to get stack details.", exc_info=e)
raise e