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[英]How to List which SNS topics a SQS queue is subscribed to using cli or boto3?
[英]AWS: empty SQS queue when subscribed to SNS via boto3
通過boto3訂閱SNS主題時,我在SQS隊列中沒有收到任何消息。
這是我使用的代碼或API憑據的問題嗎? 與此帳戶關聯的IAM策略具有AWS PowerUser權限,這意味着它具有對管理SNS主題和SQS隊列的無限制訪問權限。
當我通過AWS控制台(創建主題,創建隊列,訂閱隊列到主題)創建等效結構並使用boto3,AWS CLI或AWS控制台發送消息時,消息正確顯示。
我不認為這是代碼的問題,因為正確返回了SubscriptionArn
?
我在US-EAST-1和AP-SE-1地區嘗試了這個,結果相同。
示例代碼:
#!/usr/bin/env python3
import boto3
import json
def get_sqs_msgs_from_sns():
sqs_client = boto3.client('sqs', region_name='us-east-1')
sqs_obj = boto3.resource('sqs', region_name='us-east-1')
sns_client = boto3.client('sns', region_name='us-east-1')
sqs_queue_name = 'queue1'
topic_name = 'topic1'
# Create/Get Queue
sqs_client.create_queue(QueueName=sqs_queue_name)
sqs_queue = sqs_obj.get_queue_by_name(QueueName=sqs_queue_name)
queue_url = sqs_client.get_queue_url(QueueName=sqs_queue_name)['QueueUrl']
sqs_queue_attrs = sqs_client.get_queue_attributes(QueueUrl=queue_url,
AttributeNames=['All'])['Attributes']
sqs_queue_arn = sqs_queue_attrs['QueueArn']
if ':sqs.' in sqs_queue_arn:
sqs_queue_arn = sqs_queue_arn.replace(':sqs.', ':')
# Create SNS Topic
topic_res = sns_client.create_topic(Name=topic_name)
sns_topic_arn = topic_res['TopicArn']
# Subscribe SQS queue to SNS
sns_client.subscribe(
TopicArn=sns_topic_arn,
Protocol='sqs',
Endpoint=sqs_queue_arn
)
# Publish SNS Messages
test_msg = {'default': {"x":"foo","y":"bar"}}
test_msg_body = json.dumps(test_msg)
sns_client.publish(
TopicArn=sns_topic_arn,
Message=json.dumps({'default': test_msg_body}),
MessageStructure='json')
# Validate Message
sqs_msgs = sqs_queue.receive_messages(
AttributeNames=['All'],
MessageAttributeNames=['All'],
VisibilityTimeout=15,
WaitTimeSeconds=20,
MaxNumberOfMessages=5
)
assert len(sqs_msgs) == 1
assert sqs_msgs[0].body == test_msg_body
print(sqs_msgs[0].body) # This should output dict with keys Message, Type, Timestamp, etc., but only returns the test_msg
if __name__ == "__main__":
get_mock_sqs_msgs_from_sns()
我收到這個輸出:
$ python .\sns-test.py
Traceback (most recent call last):
File ".\sns-test.py", line 55, in <module>
get_sqs_msgs_from_sns()
File ".\sns-test.py", line 50, in get_sqs_msgs_from_sns
assert len(sqs_msgs) == 1
AssertionError
上面針對C#AWS SDK提出的類似問題的URL讓我正確地指出了這個問題:我需要將策略附加到SQS隊列以允許SNS主題寫入它。
def allow_sns_to_write_to_sqs(topicarn, queuearn):
policy_document = """{{
"Version":"2012-10-17",
"Statement":[
{{
"Sid":"MyPolicy",
"Effect":"Allow",
"Principal" : {{"AWS" : "*"}},
"Action":"SQS:SendMessage",
"Resource": "{}",
"Condition":{{
"ArnEquals":{{
"aws:SourceArn": "{}"
}}
}}
}}
]
}}""".format(queuearn, topicarn)
return policy_document
和
policy_json = allow_sns_to_write_to_sqs(topic_arn, queue_arn)
response = sqs_client.set_queue_attributes(
QueueUrl = queue_url,
Attributes = {
'Policy' : policy_json
}
)
print(response)
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