boto3 publish message in SNS - amazon-web-services

Question

I want to run a script to publish message to my sns topic. I followed the documentation and my code is this :
import boto3
client = boto3.client('sns')
response = client.publish(
TopicArn='my topic arn',
Message='ptt message '
)
print("Response: {}".format(response))
It prints the response json, but I don't see any message in my AWS SNS console. I have a lambda function which is pretty basic as a subscriber to this sns.
The lambda code :
import json
def lambda_handler(event, context):
# TODO implement
return {
'statusCode': 200,
'body': json.dumps('Hello from Lambda!')
}
How can I be sure that my message "ptt message" has been published successfully? How can I check it?

Answer 1

For testing of integration you can configure Delivery status logging for your SNS topic. There is a simple setting for this in GUI of SNS. This will export to CloudWatch the logs of your subscription triggers.
Secondly, your Lambda is not doing anything with the event, so your "ptt message stays in the "event" dictionary. You can for example log your event and see the structure where the actual message body comes.
import logging
def lambda_handler(event, context):
logging.info(event)
...
And simply to see that the Lambda was triggered by the subscription, you can open the CloudWatch Logs, find the LogGroup automatically created by AWS for your Lambda (has the name of the function in it) and search the Log Group. There are comfortable filters by "last X minutes".
In order to test this integration you can also publish test messages to SNS Topic from the web interface if this feels more convenient than running a script.