def create_stack()

in util/vpc-tools/create_stack.py [0:0]

• 35 lines of code
• 6 McCabe index (conditional complexity)

def create_stack(stack_name, template, region='us-east-1', blocking=True,
                 temp_bucket='edx-sandbox-devops', parameters=[],
                 update=False):

    cfn = boto.connect_cloudformation()

    # Upload the template to s3
    key_pattern = 'devops/cloudformation/auto/{}_{}'
    key_name = key_pattern.format(stack_name, basename(template))
    template_url = upload_file(template, temp_bucket, key_name)

    # Reference the stack.
    try:
        if update:
            stack_id = cfn.update_stack(stack_name,
                template_url=template_url,
                capabilities=['CAPABILITY_IAM'],
                tags={'autostack':'true'},
                parameters=parameters)
        else:
            stack_id = cfn.create_stack(stack_name,
                template_url=template_url,
                capabilities=['CAPABILITY_IAM'],
                tags={'autostack':'true'},
                parameters=parameters)
    except Exception as e:
        print(e.message)
        raise e

    status = None
    while blocking:
        sleep(5)
        stack_instance = cfn.describe_stacks(stack_id)[0]
        status = stack_instance.stack_status
        print(status)
        if 'COMPLETE' in status:
            break

    if status in FAILURE_STATES:
        raise Exception('Creation Failed. Stack Status: {}, ID:{}'.format(
            status, stack_id))

    return stack_id