Simple Notification Service

Question 1

Amazon SNS

Answer 1

managed notification service. works on a push mechanism.

Question 2

SNS topic

Answer 2

acts as an access point in between the publisher and subscriber applications. Topic policy controls who can publish message and subscribe to a topic.

Question 3

Amazon SNS Fanout

Answer 3

SQS queues act as a subscriber. a publisher sends a message to a SNS topic, and SNS topic distributes it to many SQS queues in parallel.

Question 4

Key Concept of access policy

Answer 4

Permission; Statement; Policy; Issuer; principal; Action; Resource; Conditions and keys; Requester; Evaluation; Effect; Default deny; allow; explicit deny;

Question 5

SNS Best Practices

Answer 5

recommended to configure alerts on various SNS standard metrics to observe performance parameters such as success rates, failure rates, deliveries to SQS, and so on.
access policy to control who can publish to and receive from a SNS topic.
ensure all of subscription deleted first before delete a topic.
Use SNS and SQS to build loosely coupled application or a server less architecture.

Question 6

Publishers

Answer 6

creates a topic and controls access to it. Policies determine which topics publishers can write to.

Question 7

Message Data

Answer 7

Json key-value pair;
posts to https/s endpoints with specific headers;
allow developers to parse;
message; 
messageId; 
signature; 
signatureVersion; 
SigningCertURL; 
Subject; 
Timestamp; 
TopicArn; 
Type; 
UnsubscribeURL;

Question 8

Message Attributes

Answer 8

Name; Type; Value and Messagebody can not be empty or null.
§ Can send structured metadata along with messages
§ Allows override default denies
§ Explicit denies override allows
§ Order of policies does not matter

Question 9

Mobile Push Notifications

Answer 9

provides the ability to send notifications directly to apps on mobile devices like message alerts, Badge updates, Sound alerts.
Services includes: ADM(Amazon Device Messagging);
APNS(Apple); Baidu Cloud Push; Google CLoud Messaging for Android; Microsoft Push Norification Service for Windows Phone; Windows Push Notification Services;
GCM use registrationID.

Question 10

SNS Push Notifications Setup Process

Answer 10

SNS needs a device token in order to send notifications to mobile endpoints;
There are device tokens and registration IDs, depending on the mobile platform;
1.request credentials from mobile platforms(ADM, APNS, etc..)
2. request a token from mobile platforms;
3. create a platform application object;
4. create a platform endpoint object;
5. publish a message to the mobile endpoint;

Question 11

Platform Specific Payloads

Answer 11

can send Push notifications at the same time to all apps/devices. send different messages depending on the platform.

Question 12

A core benefit of using a SQS subscription endpoint with Amazon SNS

Answer 12

SNS Messages can be delivered to applications that require immediate notification of an event and messages are also persistent in an Amazon SQS queue for other applications to process later in time.

Question 13

endpoints list

Answer 13

The US East (Northern Virginia) end-point is: http://sns.us-east-1.amazonaws.com

The US West (Oregon) end-point is: http://sns.us-west-2.amazonaws.com

The US West (Northern California) end-point is: http://sns.us-west-1.amazonaws.com

The EU(Ireland) end-point is: http://sns.eu-west-1.amazonaws.com

The EU(Frankfurt) end-point is: http://sns.eu-central-1.amazonaws.com

The Asia Pacific (Singapore) end-point is: http://sns.ap-southeast-1.amazonaws.com

The Asia Pacific (Tokyo) end-point is: http://sns.ap-northeast-1.amazonaws.com

The Asia Pacific (Sydney) end-point is: http://sns.ap-southeast-2.amazonaws.com

The South America (Sao Paulo) end-point is: http://sns.sa-east-1.amazonaws.com

Question 14

time period available for confirmation when subscribing

Answer 14

3 days