AWS Lambda運算服務可運作程式碼，不需預備或管理伺服器，Amazon API Gateway為充分管理之服務，方便開發者發表、維護、監控及確保大小規模的API。 本 場次將說明AWS Lambda與Amazon API Gateway基本內容，並示範如何使用這些服務製作網路、行動與物聯網後端，講解如何設定API終端後，可啟動AWS Lambda功能，處理行動、網路、物聯網及第三方API需求。各位也將認識如何使用Lambda讀取及寫入Amazon DynamoDB，並設定簡易的無伺服器部落格網路應用程式，提供用戶驗證、新增文章、留言等功能。

1. AWS Cloud Kata for Start-Ups and Developers
Taiwan
Olivier Klein , Senior Solutions Architect, AWS
Building Serverless Backends
Using AWS Lambda and Amazon API Gateway

2. AWS Cloud Kata for Start-Ups and Developers
How to build application backends?
Back-end logic DatabaseMobile

3. AWS Cloud Kata for Start-Ups and Developers
The familiar 3-Tier Architecture

4. AWS Cloud Kata for Start-Ups and Developers
Dr. Werner Vogels
CTO - Amazon

5. AWS Cloud Kata for Start-Ups and Developers
No server is easier to manage…

6. AWS Cloud Kata for Start-Ups and Developers
No server is easier to manage…
…than no server.

7. AWS Cloud Kata for Start-Ups and Developers
No server is easier to manage…
…than no server.
AWS Lambda

8. AWS Cloud Kata for Start-Ups and Developers
Utilization Window
Weeks Minutes Seconds Milliseconds
On-Premise Amazon EC2 Containers AWS Lambda

9. AWS Cloud Kata for Start-Ups and Developers
AWS Lambda: Run code in response to events
Lambda functions: Stateless, trigger-based code execution
Triggered by events:
• Direct and Asynchronous API calls
• AWS Service integrations
• 3rd party triggers
Makes it easy to:
• Perform event-driven actions
• Build back-end services that perform at scale

10. AWS Cloud Kata for Start-Ups and Developers
Amazon S3
Amazon
DynamoDB
Amazon
Kinesis
AWS
CloudFormation
AWS CloudTrail
Amazon
CloudWatch
Amazon SNS
Amazon
SES
Amazon
API Gateway
Amazon
Cognito
AWS
IoT
Amazon
Alexa
Cron events
DATA STORES ENDPOINTS
REPOSITORIES EVENT/MESSAGE SERVICES
Event Sources that integrate with AWS Lambda
… and the list continues to grow.

11. AWS Cloud Kata for Start-Ups and Developers
Multiple Application Types using AWS Lambda
Analytics
• Operational management
• Live Dashboards
Data workflows
• Content management
• ETL workflows
Interactive Backends
• Bots
• Webhooks
Autonomous IT
• Policy engines
• Infrastructure management

12. AWS Cloud Kata for Start-Ups and Developers
The Other Challenge..

13. AWS Cloud Kata for Start-Ups and Developers
Managing APIs is Hard!
Managing multiple versions and stages of an API is difficult
Monitoring 3rd party developers’ access is time consuming
Access authorization is a challenge
Traffic spikes create operational burden

14. AWS Cloud Kata for Start-Ups and Developers
API Gateway to manage your REST endpoints
Build, Deploy and Manage APIs
Throttling rules per HTTP method
Cache with customizable keys
Multiple API version and stages
Generates client SDKs
Dashboard for visual monitoring
Flexible authorization model
Usage plans for consumption

15. AWS Cloud Kata for Start-Ups and Developers
API Gateway + Lambda = Frontend + Backend
Endpoints on
Amazon EC2
Any other publicly
accessible endpoint
AWS Lambda
functions
API Gateway
Cache
Internet
Mobile Apps
Websites
Services
Amazon
CloudFront
Amazon
API Gateway
Amazon CloudWatch
Monitoring

16. AWS Cloud Kata for Start-Ups and Developers
DDoS and Network Protection
Internet
Mobile Apps
Websites
Services
AWS Lambda
functions
Endpoints on
Amazon EC2
Amazon
CloudFront
Amazon
API Gateway
Layer 7 and layer 3 DDoS protection
Request throttling for backend services

17. AWS Cloud Kata for Start-Ups and Developers
Attaching Lambda functions to RESTful HTTP Endpoints
1:1 Mapping - Every API call triggers a stateless Lambda function
• Add caching to API calls to return a cached response instead for duplicate requests
API Gateway Concepts - API defined as a set of resources and methods
• Resource: A logical entity that can be accessed within an API
• Method: Resource path and an HTTP command such as GET/POST
Automatic Scaling – API Gateway and Lambda scale automatically
• Safety throttle of 100 concurrent Lambda functions, can be increased by AWS Support
• User defined standard-rate limit and a burst-rate limit per second for each API method

18. AWS Cloud Kata for Start-Ups and Developers
AWS Lambda
Hello World API
Amazon API
Gateway
Python (Chalice)
Postman
DEMO
Test
Build / Deploy

19. AWS Cloud Kata for Start-Ups and Developers
Web App

20. AWS Cloud Kata for Start-Ups and Developers
Real World Architecture

21. AWS Cloud Kata for Start-Ups and Developers
Real World “Serverless” Architecture

22. AWS Cloud Kata for Start-Ups and Developers
Storage and Delivery of the App
Amazon S3
Amazon
CloudFront
Amazon S3
• Highly available object storage
• Designed for 99.999999999% durability
• Offers HTTP / HTTPS endpoint to objects
Amazon CloudFront
• Content Delivery Network with 59 edge
locations across the world
• Caches content on edge locations for low
latency

23. AWS Cloud Kata for Start-Ups and Developers
Swagger

24. AWS Cloud Kata for Start-Ups and Developers
Swagger!
Swagger
• Goal is to define a language-agnostic
interface to REST APIs
• Ecosystem of tools to explore, visualize,
document and test APIs
SwaggerHub
• Collaborative platform to define and manage
APIs
• Integration with Amazon API Gateway
www.swagger.io

25. AWS Cloud Kata for Start-Ups and Developers
Swagger – Build an API in minutes!
Amazon API
Gateway
Swagger
DEMO
AWS Lambda
Function
AWS Lambda
Function

26. AWS Cloud Kata for Start-Ups and Developers
NLTK & Lambda
NLTK is a toolkit written in Python to
facilitate Natural Language Processing
(NLP)
Provides easy-to-use interfaces for
classification, tokenization, stemming,
tagging, parsing, and semantic reasoning
VADER - Rule-based Model for Sentiment
Analysis of Social Media Text www.nltk.org

27. AWS Cloud Kata for Start-Ups and Developers
Amazon S3
Sentiment Analysis Web App
Amazon API
Gateway
Amazon
Route 53
HTML / JS / CSS
Swagger
www.aws.klein.asia
api.aws.klein.asia
DEMO

28. AWS Cloud Kata for Start-Ups and Developers
Best Practices

29. AWS Cloud Kata for Start-Ups and Developers
Best Practices for Lambda functions
Memory
• CPU proportional to memory
• Increasing =memory makes your code
execute faster (if CPU bound)
Timeout
• Increasing timeout allows for longer
functions, but more wait in case of
errors
Retries
• For API Gateway, Lambda doesn’t
retry the function execution if failed
• Gateway generated SDKs retry
throttled requests
Permission Model
• API Gateway synchronously triggers
Lambda, so assign API Gateway a
resource policy to invoke Lambda

30. AWS Cloud Kata for Start-Ups and Developers
Using API Gateway Input/Output Transforms
Filter Output Results
• Remove private/unnecessary data
• Filter dataset size to improve API
performance
Translate between client and
backend
• Convert GET query strong parameters
to body for POST
• Talk XML to API user-interface but
JSON to Lambda

31. AWS Cloud Kata for Start-Ups and Developers
Managing different versions of your API stack
Operate multiple API versions and
multiple stages for each version
simultaneously
Clone an existing API to start working on
the next major version
Set up custom domain names to point
directly to a stage
Version Lambda functions, and associate
API stage with Lambda function version
alias

32. AWS Cloud Kata for Start-Ups and Developers
Final Thoughts
Plug-in API Gateway early. It allows to split your API
between legacy EC2 and new Lambda functions
Create many version and stages – no additional charges for
APIs, allows for backwards compatibility
Document your API from Day 1
Test your API calls consistently and automatically
Always use serverless interfaces when possible – HTML5
and JS frameworks like React or Angular are useful

33. AWS Cloud Kata for Start-Ups and Developers
Thank you!
Olivier Klein
Senior Solutions Architect
AWS