Fanout Amazon SNS notifications to Amazon SQS queues for asynchronous processing

Amazon SNS works closely with Amazon Simple Queue Service (Amazon SQS). These services provide different benefits for developers.

Amazon SNS lets applications send time-critical messages to multiple subscribers through a “push” mechanism. This removes the need to check or “poll” for updates. Amazon SQS is a message queue service that distributed applications use to exchange messages through a polling model. It decouples sending and receiving components—without requiring each component to be available at the same time.

When you use Amazon SNS and Amazon SQS together, messages reach applications that need instant notification of an event. The messages also persist in an Amazon SQS queue for other applications to process later.

When you subscribe an Amazon SQS queue to an Amazon SNS topic, you can publish a message to the topic and Amazon SNS sends an Amazon SQS message to the subscribed queue. The Amazon SQS message contains the subject and message that were published to the topic along with metadata about the message in a JSON document. The Amazon SQS message will look similar to the following JSON document.

{
   "Type" : "Notification",
   "MessageId" : "63a3f6b6-d533-4a47-aef9-fcf5cf758c76",
   "TopicArn" : "arn:aws:sns:us-west-2:123456789012:MyTopic",
   "Subject" : "Testing publish to subscribed queues",
   "Message" : "Hello world!",
   "Timestamp" : "2012-03-29T05:12:16.901Z",
   "SignatureVersion" : "1",
   "Signature" : "EXAMPLEnTrFPa3...",
   "SigningCertURL" : "https://sns.us-west-2.amazonaws.com/SimpleNotificationService-f3ecfb7224c7233fe7bb5f59f96de52f.pem",
   "UnsubscribeURL" : "https://sns.us-west-2.amazonaws.com/?Action=Unsubscribe&SubscriptionArn=arn:aws:sns:us-west-2:123456789012:MyTopic:c7fe3a54-ab0e-4ec2-88e0-db410a0f2bee"
}