getting list of aws lambda functions from within the code of a lambda function

Question

I have a lambda function within AWS based off the clear-lambda-storage application at . There is code that is as follows:

from argparse import Namespace
from clear_lambda_storage import remove_old_lambda_versions


def clear_lambda_storage(event, context):
    remove_old_lambda_versions(Namespace(token_key_id=None, token_secret=None, regions=None, profile=None, num_to_keep=3, function_names=["insertName"]))
    return "Successful clean! 🗑 ✅"

With the function_names argument I want to have a list of names of all the lambda functions in the account - is there any way I can do this besides manually hardcoding them (so that if a new lambda function is added, the list is updated).

lynkfox · Accepted Answer · 2021-10-14 21:18:32Z

1

use the SDK. IN ptyhon, this is boto3, and so one of these commands, probably https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/lambda.html#Lambda.Client.list_functions

answered Oct 14, 2021 at 21:18

lynkfox

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4 Comments

Sabo Boz Over a year ago

but this returns a maximum of 50 functions per call - to get all the lambda functions would I need to keep calling it multiple times?

lynkfox Over a year ago

Not quite - you need to use Pagination. The NextMarker (string) tag gives you the ability to page along the results. It technically is multiple calls, but can be done with the same client declaration in your code.

Sabo Boz Over a year ago

sorry what do you mean by same client declaration? do you have an example

lynkfox Over a year ago

With the SDKs (ie boto3) you declare a client for connecting to a given service. fn_client = boto3.client("lambda") as long as you are not re-declaring a client, you can make multiple fn_client.list_functions() calls with the NextMarker token as a starting point in order to page through all of them. Doing so in a Loop is one method.

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