My system run on an Amazon autoscaling group and one feature allows user to user messaging and I have the following use case to resolve.
- A new message is sent in my application between users.
- A message to notify the the user by e-mail is dropped into a queue with a 60 second delay. This delay allows time for a realtime chat client (faye/angularjs) to see the message and mark it as viewed.
- After the delay the message is picked up, the "read" status is checked and if it has not been read by the client an e-mail is dispatched.
Originally I was going to use a cronjob on each application server poll the message queue however it occurs to me it would be more efficient to use SNS to call some kind of e-mail sending endpoint (perhaps in Lambda).
I can't see any way to have SNS poll SQS however, can anybody suggest how this could be done? Essentially I want SNS with a delay so that I don't spam somebody in a "live" chat with e-mail alerts.
Thanks
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