We built event-driven user interfaces for decades. What about bringing the same approach to mobile, web, and IoT backend applications? You have to understand how data flows and what is the propagation of changes, using reactive programming techniques. You can focus on the core functionalities to build and the relationships among the resources you use. Your application behaves similarly to a “spreadsheet”, where depending resources are updated automatically when something “happens”, and is decomposed into scalable microservices without having to manage the infrastructure. The resulting architecture is efficient and cost effective to run on AWS and managing availability, scalability and security becomes part of the implementation itself.

1. Event-driven (Serverless) Applications
Danilo Poccia
AWS Technical Evangelist
@danilop
danilop

2. 2001

3. Decentralized,
two-pizza teams
Agility, autonomy,
accountability,
and ownership
“DevOps”

4. You Want to Build
Your Brand New Application

5. Application
+
Data

6. Application
+
Data
Websites
Mobile
Apps
Wearable

7. Application Data
Websites
Mobile
Apps
Wearable

8. Application
Files
DB
Content +
Some API Calls
API Calls
Websites
Mobile
Apps
Wearable

9. Application
Files
DB
API Calls
Websites
(JavaScript
Apps)
Mobile
Apps
Wearable
JavaScript
API Calls

10. Application
Files
DB
API Calls
Websites
(JavaScript
Apps)
Mobile
Apps
Wearable
Services
API Calls
JavaScript
API Calls

11. Application
Files
DB
API Calls
Websites
(JavaScript
Apps)
Mobile
Apps
Wearable
Services
API Calls
JavaScript
Authentication
& Authorization
Caching &
Throttling
Business
Logic
API Calls

12. Application
DB
API Calls
Websites
(JavaScript
Apps)
Mobile
Apps
Wearable
Services
API Calls
JavaScript
Files
Amazon
S3
Amazon
DynamoDB
Authentication &
Authorization
Amazon
Cognito
Business Logic
AWS
Lambda
Caching & Throttling
Amazon API
GatewayAPI Calls

13. How Does It Works?

14. X
Authentication
Providers
End Users
User
Credentials
Authentication
Token
Amazon Cognito
Identity Broker
Identity Pool Id
(Token)
Identity Id
AWS Temp Credentials
(Depending on
Auth / Unauth Role)
Access to
AWS Services
(Including Amazon
API Gateway)
Identity Id
AWS Temp Credentials
Amazon S3
Amazon
DynamoDB
Amazon
Mobile Analytics
Amazon Cognito
Sync Store
K / V
Authentication &
Authorization
Amazon
CognitoCheck Token

15. X
End Users
User
Credentials
Authentication
Token
Amazon Cognito
Identity Broker
Identity Pool Id
(Token)
Identity Id
AWS Temp Credentials
(Depending on
Auth / Unauth Role)
Access to
AWS Services
(Including Amazon
API Gateway)
Identity Id
AWS Temp Credentials
Amazon S3
Amazon
DynamoDB
Amazon
Mobile Analytics
Amazon Cognito
Sync Store
K / V
Custom
Authentication
Service
Get Token
Token Authentication &
Authorization
Amazon
Cognito

16. Amazon
CloudFront
API Gateway
Cache
Amazon
CloudWatch
Monitoring & Logs
Endpoints on
Amazon EC2 or
AWS Elastic Beanstalk
Internet
Any other publicly
accessible endpoint
AWS Lambda
Functions
Caching & Throttling
Amazon API
Gateway
X
Access to
API Method

18. Managed Cache to Store API Responses
Reduced Latency and DDoS Protection through Amazon CloudFront
SDK Generation for iOS, Android and JavaScript
HTTP 429 Response for API Throttling (Managed by the SDK)
Swagger Support
Request / Response Data Transformation and API Mocking

19. Business Logic
AWS
Lambda
AWS
Lambda
Functions
Amazon
API Gateway Amazon S3
Amazon
DynamoDB
Amazon Cognito
Sync Store
K / VAmazon
SNS
Amazon
Kinesis
Alexa Skills Kit (ASK)
Alexa Voice Service (AVS)
HTTPS
Invoke
Custom
Events
HTTPS
REST
API Call
Amazon
SES
Amazon
SWF
AWS IoT
?
?
?
?
?
?
?

20. Build Back-end Services that Perform at Scale
Respond Quickly to New Information
Run Your Code without Managing Infrastructure
Cost-effective and Efficient

21. Amazon API Gateway
+
AWS Lambda

22. Resource + HTTP Verb ➔ Method

23. Resource + HTTP Verb ➔ Method
/books + GET ➔ GetAllBooks

24. Resource + HTTP Verb ➔ Method
/books + GET ➔ GetAllBooks
/books + POST ➔ CreateNewBook

25. Resource + HTTP Verb ➔ Method
/books + GET ➔ GetAllBooks
/books + POST ➔ CreateNewBook
/books/{id} + GET ➔ GetBookById
/books/{id} + PUT ➔ CreateOrUpdateBookById
/books/{id} + DELETE ➔ DeleteBookById

26. Let’s Put Everything Together

27. Media Sharing Application

28. λ
λ λ
Amazon
API Gateway
λ
λ
λ
λ
Bucket Usage
Table
Media Metadata
Table
User Stat
Table
User
Location
Table
K / V
λ
λ
λ
Amazon Cognito
Identity Broker
Amazon Cognito
Sync Store
Amazon
SNS
Amazon
Kinesis
Media
Bucket
Log
Table
Authentication
&
Authorization
Upload Picture / VideoUpdate Bucket UsageCheck Bucket Usage
Delete
“Over Quota”
Media
Send Notification
to
User / Application
Extract Metadata and
Write on DB
Update
User Statistics
Call REST API
to Get
Media Description
Upload
Location Info
Update
User Location
Look for
Users or Media
Near Current Location
Call REST API
to Get
User Info
Sync
Media and User
Rating
Write
History of Changes
Check and Update
Ratings
Invoke
Read
Write / Send

29. λ
λ λ
λ
λ
λ
λ
λ
λ
λ

30. Microservice Architecture
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λ

31. Choreography vs Orchestration
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λ

32. Reactive Programming
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λ

33. <demo>
…
</demo>

34. Focus on You Idea

35. aws.amazon.com/free

36. Event-driven (Serverless) Applications
Danilo Poccia
AWS Technical Evangelist
@danilop
danilop