Lambda：如何遍历/循环 SNS 主题以获取所有主题属性？答案

【问题标题】：Lambda: How to iterate /loop through the SNS topics to get all Topic Attributes?Lambda：如何遍历/循环 SNS 主题以获取所有主题属性？
【发布时间】：2019-12-30 18:41:30
【问题描述】：

我正在为 AWS SNS 编写自定义配置规则，并希望遍历所有主题。我可以使用.list_topics() 获取所有主题，但无法遍历这些主题以获取每个主题的属性。目前，我能够获取唯一第一个的 SNS 主题属性 topic_arn = response["Topics"][0]['TopicArn']

我想从列出的所有主题中获取 SNS 主题属性，可以想到 for 循环吗？如何for循环主题？

def get_all_topics(sns_client):
  sns_client = boto3.client('sns')
  response = sns_client.list_topics()
  topics = [topic['TopicArn'] for topic in response['Topics']]
  print("Topic List: %s" % topics)
  return topics

'''
Fetch SNS Topic attributes
'''
def get_topic_attributes():
  sns_client = boto3.client('sns')
  response = sns_client.list_topics()
  topic_arn = response["Topics"][0]['TopicArn']
  response_topic_attribute_dict = sns_client.get_topic_attributes(TopicArn=topic_arn)
  print("SNS Topic attributes: %s" % response_topic_attribute_dict)
  return response_topic_attribute_dict

''' 测试 SNS For Loop 出现错误 '''

def evaluate_compliance():
  sns_client = boto3.client('sns')
  response = sns_client.list_topics()
  topics = [topic['TopicArn'] for topic in response['Topics']]
  for topic_dict in topics:
      response = sns_client.list_topics()
      response_topic_attributes_dict = sns_client.get_topic_attributes(TopicArn=topic_dict['TopicArn'])

【问题讨论】：

标签： python aws-lambda boto3 amazon-sns

【解决方案1】：

这是我的测试代码。 boto3 会话的定义可能不同，但您可以忽略。

import boto3

session = boto3.session.Session(region_name='ap-northeast-2')
client = session.client('sns')

response = client.list_topics()
for item in response['Topics']:
    print(item['TopicArn'])

或

import boto3

session = boto3.session.Session(region_name='ap-northeast-2')
sns = session.resource('sns')

for topic in sns.topics.all():
    print(topic.arn)

结果是：

arn:aws:sns:ap-northeast-2:1...3:2...
arn:aws:sns:ap-northeast-2:1...3:A...
arn:aws:sns:ap-northeast-2:1...3:A...
arn:aws:sns:ap-northeast-2:1...3:A...
arn:aws:sns:ap-northeast-2:1...3:A...
arn:aws:sns:ap-northeast-2:1...3:A...
arn:aws:sns:ap-northeast-2:1...3:A...
arn:aws:sns:ap-northeast-2:1...3:B...
arn:aws:sns:ap-northeast-2:1...3:B...
arn:aws:sns:ap-northeast-2:1...3:B...
arn:aws:sns:ap-northeast-2:1...3:B...

继续使用此代码，您可以获得所有主题的属性，例如：

import boto3

session = boto3.session.Session(region_name='ap-northeast-2')
client = session.client('sns')

response = client.list_topics()
for item in response['Topics']:
    print(item['TopicArn'])
    print(client.get_topic_attributes(TopicArn=item['TopicArn']))

【讨论】：

谢谢，但您上面的代码只打印所有 TopicArn 的。您如何从所有主题中获取主题属性？在我的代码中，我只能获取一个 topic 的属性。 topic_arn = response["Topics"][0]['TopicArn'] response_topic_attribute_dict = sns_client.get_topic_attributes(TopicArn=topic_arn)