Deleting unused aws sns topics

delete_bad_topics.py

# you will need to set your keys and your region name in your ~/.aws/config for this to work
import boto3

session = boto3.session.Session(region_name='us-east-1') # make sure this is the region you are using
sns = session.resource('sns')
client = boto3.client('sns')


topics = {}
dead_subs = []
for topic in sns.topics.all():
    topics[topic.arn] = 0

for sub in client.get_paginator('list_subscriptions').paginate():
	for subscription in sub["Subscriptions"]:
		arn = subscription["TopicArn"]
		SubscriptionArn = subscription["SubscriptionArn"]
		try:
			topics[arn] = topics[arn] + 1 
		except Exception:
			dead_subs.append(SubscriptionArn)

dead_topics = { key:value for (key,value) in topics.items() if value == 0}

for dead_topic_arn in dead_topics:
  response = client.delete_topic(
      TopicArn=dead_topic_arn
  )
  print(dead_topic_arn)
	
for dead_sub_arn in dead_subs:
	response = client.unsubscribe(
	    SubscriptionArn=dead_sub_arn
	)

print("dead_topics:")
print(dead_topics)
print("dead_subscriptions:")
print(dead_subs)