Why is subscriber optional on ansible sns

Question

I subscribe to a lambda function to an SNS topic. When I do this using the aws console or even the aws command-line interface, there is a column named "subscriber" in the subscription information, which contains my account id.

I am unable to control this field using neither AWS console nor the command-line. However, I can do the same thing using ansible.

---

- name: set up topic and subscribe lambda

sns_topic:

   name: "topic_name"

   state: present

   display_name: "Display Name"

   Subscriptions:

        - endpoint: "arn:aws:lambda:ap-southeast-2:123456789:function:functionName"

  protocol: "lambda"

  subscriber: 123456789

Here a couple of questions I had. Isn't the subscriber field optional? But the SNS messages do not seem to reach lambda without it.

• What is this field for?

• Can I subscribe to Lambdas in other accounts for my SNS topic?

• How can I affect change in this field with AWS CLI?

• Why is it optional in Ansible 2.4

Answer 1

Hey @bug_seeker, I could not find any reference to the field "subscriber".

I guess this could have been supported by the older sdk/api  which has now been dropped.

Although here are some findings from my research on this topic:

1. I couldn't find the subscriber field in the AWS console when subscribing to lambda. You can see the image below:

 2. Even in the AWS command line there is no such field. 

Link for SNS Subscribe command through CLI documentation.