Question 95763 in Amazon Web Sevices Question posted in
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Filtering AWS SNS messages by attribute value but only if attribute is present – Amazon web services

I would like to know how I can create a filtering policy for AWS SNS subscription that would check a message attribute value but only if that attribute is present. By default if I check an attribute value but attribute is not present message is ignored e.g:

"customer_interests": ["paintball"]

I also found this for attribute presence checking:

"customer_interests": [{"exists": true}]

But I’m not sure how to combine this two checks into a single policy.

I’ve tried the obvious thing:

{
   "customer_interests": [{"exists": false}, "paintball"]
}

but it doesn’t work.

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2

Answers


  1. 0

    You apply OR logic in SNS subscription filter policies, by assigning multiple values to an attribute name.

    Your example:

    {
   "customer_interests": [{"exists": false}, "paintball"]
}

    should result in filtering messages that:

    • do not have the customer_interests message attribute
    • OR have the customer_interests message attribute set to paintball

    Please note that additions or changes to a subscription filter policy require up to 15 minutes to fully take effect, as Amazon SNS is eventually consistent.

    Changes will not always take effect immediately.

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  2. 0

    i have tried the following thing ( your obvious thing ) and it worked for me, i didn’t have to even wait for 15 minutes (clearly eventual consistency is not the issue )

    Used the following policy

    {
  "customer_interests": [
    {
      "exists": false
    },
    "paintball"
  ]
}
    • Created a sns topic with email-based subscription
    • added filter policy to subscriber

    tried with three use case

    Case 1

    • message hello
    • attribute type string
    • atrribute name customer_interests
    • atrribute value paintball
    • status recieved

    Case 3

    • message hello
    • attribute type string
    • atrribute name customer_interests
    • atrribute value xyz
    • status not recieved

    Case 3

    • message hello
    • attribute type string
    • atrribute name jatin
    • atrribute value test
    • status recieved
    Login or Signup to reply.
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