cfn.py 文件源码

def _are_there_existing_servers(context):
    if not 'ec2' in context:
        # very old stack, canned response
        return True

    if isinstance(context['ec2'], bool):
        # no ec2 instances or an instance whose buildvars haven't been updated.
        # either way, the value here can be used as-is
        return context['ec2']

    num_suppressed = len(context['ec2'].get('suppressed', []))
    cluster_size = context['ec2'].get('cluster-size', 1)
    return context['ec2'] and num_suppressed < cluster_size