CODEWITHSUNDEEP
amazon-web-servicesamazon-sns
Pavlo
Pavlo

Reputation: 1654

Filtering AWS SNS messages by attribute value but only if attribute is present

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.

Upvotes: 1

Views: 3543

Answers (2)

Jatin Mehrotra
Jatin Mehrotra

Reputation: 11574

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

Upvotes: 1

Ermiya Eskandary
Ermiya Eskandary

Reputation: 23672

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.

Upvotes: 1

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