SNS
Overview
fully managed topic-based pub/sub model.
Auto scale
Built-in encryption
Allowing asynchronous communication between apps.
Features
A2A messaging
Application-to-person notification (mobile phone, mobile app, email)
Filter policy
Is a JSON object containing properties that define which messages the subscriber receives.
To receive only a subset of the messages, a subscriber must assign a filter policy to the topic subscription. If a subscription doesn't have a filter policy, the subscriber receives every message published to its topic.
Message security
Encryption at rest (AWS KMS)
In-flight encryption by establishing a private connection between SNS & VPC.
Access control: IAM policies
SNS Access Policies (similar to S3 bucket policies)
Publish method
Topic publish | Direct publish |
- create topic, subscription - Publish to the topic | - Create a platform app - Create a platform endpoint - Publish to that endpoint |
Best practices
Use topics to organize messages.
Ensure that topic is NOT publicly accessible.
Use subscriptions to control message delivery
Using domain name instead of raw http endpoints.
FAQ
FIFO topic names must end with
.fifoMax 12.5 milions subscribers
Max 100,000 topics.
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