Amazon SNS¶

• What if you want to send one message to many receivers?

• The "event producer" only sends message to SNS topic
• As many "event receivers" (subscriptions) as we want to listen to the SNS topic notifications
• Each subscriber to the topic will get all the messages (note: new feature to filter messages)
• Up to 12,500,000 subscriptions per topic
• 100,000 topics limit

• Many AWS services can send data directly to SNS for notifications

How to publish¶

• Topic Publish (using the SDK)
  • Create a topic
  • Create a subscription (or many)
  • Publish to the topic
• Direct publish (for mobile apps SDK)
  • Create a platform application
  • Create a platform endpoint
  • Publish to the platform endpoint
  • Works with Google GCM, Apple APNS, Amazon ADM

Security¶

• Encryption:
  • In-flight encryption using HTTPS API
  • At-rest encryption using KMS
  • Client-side encryption if the client wants to perform encryption/decryption itself
• Access Controls: IAM policies to regulate access to the SNS API
• SNS Access Policies (similar to S3 bucket policies)
  • useful for cross-account access to SNS topics
  • Useful for allowing other services (s3...) to write to an SNS topic