def load(self):
self.stack = self.aws_cfn.Stack(self.stack_name)
try:
self.stack.load()
logger.debug('Loaded Stack: %r', self.stack)
except ClientError as error:
logger.error(MESSAGE_STACK_NOT_FOUND.format(
stack_name=self.stack_name, message=error.message))
self.notify(DeploymentResponse.STATUS_FAILURE, error.message)
def __init__(self, event, context):
self.event = event
logger.debug('Received event: %r', event)
self.context = context
logger.debug('Received context: %r', context)
self.aws_cfn = boto3.resource('cloudformation')
self.aws_sns = boto3.resource('sns')
self.aws_lambda = boto3.client('lambda')
self._output_topics = None
self._cfn_output_topics = None
self._stack_update_parameters = None
self._stack_name = None
self.stack = None
def update(self):
logger.debug('Parameters to be updated: %s', self.stack.parameters)
merged = self.stack_update_parameters.merge(self.stack.parameters)
logger.debug('Merged parameters: %s', merged)
try:
logger.debug('Will try to update Cloudformation')
self.stack.update(
UsePreviousTemplate=True,
Parameters=merged,
Capabilities=['CAPABILITY_IAM'],
NotificationARNs=self.cfn_output_topics)
message = 'Cloudformation was triggered successfully.'
logger.debug(message)
self.notify(DeploymentResponse.STATUS_SUCCESS, message)
except ClientError as error:
logger.error(MESSAGE_UPDATE_PROBLEM.format(
stack_name=self.stack_name, message=error.message))
self.notify(DeploymentResponse.STATUS_FAILURE, error.message)
def parse_event(self):
message = json.loads(self.event['Records'][0]['Sns']['Message'])
self._stack_update_parameters = StackUpdateParameter(message)
self._stack_name = self._stack_update_parameters.stack_name
logger.debug('Extracted Update Parameters: %r',
self._stack_update_parameters)
