Serverless integration zero code

Nov 21, 20210 likes134 views

A Talk that de-mystifies direct AWS Service Integrations with the AWS API Gateway and explores the Serverless Mindset at the same time.

Who am I?
Michael Walmsley
§ Serverless Architect
§ Accenture: MyWizard AiOps
§ AWS Community Builder
§ Twitter: @walmsles

What are we
Learning today?
•How the API gateway works
•Using Serverless
framework without Lambda
•Key Learnings

Give your developers a problem.
They will code you a solution
Inspired by Farrah Campbell and Ben Kehoe
talks on the “Serverless Mindset”

Serverless
Framework:
Its all in the
Resources!

API Method is the Secret
Type: AWS::ApiGateway::Method
Properties:
Integration:
IntegrationHttpMethod: POST
Type: AWS
Credentials: !GetAtt apigSqsSendmessageRole.Arn
Uri:
!Join
- "/"
- - 'arn:aws:apigateway:${aws:region}:sqs:path’
- ${aws:accountId}
- !GetAtt sqsQueue.QueueName
PassthroughBehavior: NEVER

Request mapping with
Velocity Templates (VTL)
Type: AWS::ApiGateway::Method
Properties:
Integration:
PassthroughBehavior: NEVER
RequestParameters:
integration.request.header.Content-Type: "'application/x-www-form-urlencoded'"
RequestTemplates:
application/json: "Action=SendMessage&MessageBody=$input.json('$')"

$Response mapping with VTL Type: AWS::ApiGateway::Method Properties: Integration: IntegrationResponses: - StatusCode: "200" ResponseTemplates: application/json: |- #set ($root=$input.path('$')){ "resuest_id": "$root.SendMessageResponse.ResponseMetadata.RequestId", "message_id": "$root.SendMessageResponse.SendMessageResult.MessageId", "accepted": "ok" }$

Key Learnings
• Direct API Gateway Integrations are not hard
• Its all just Cloud Formation J
• All the hard work is done by the API Method
• Using AWS::Apigateway::Deployment is tricky
• Deploys first time but never again since it never changes
• Needed to use aws-cli to create new deployments L

Zero Code does work!
We can create solutions
with ZERO CODE !

References
• The blog - https://blog.walmsles.io/serverless-integration-zero-code
• The Github Repo – https://github.com/walmsles/zero-code-api-sqs
• Farrah Campbell – https://www.youtube.com/watch?v=mItY0tI-C_o&t=8s
• Ben Kehoe – https://www.youtube.com/watch?v=8Rzv68K8ZOY
• Alex Debrie – https://www.alexdebrie.com/posts/api-gateway-elements/

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Serverless integration zero code

2. Serverless Integration Zero Code

3. Who am I? Michael Walmsley § Serverless Architect § Accenture: MyWizard AiOps § AWS Community Builder § Twitter: @walmsles

4. What are we Learning today? •How the API gateway works •Using Serverless framework without Lambda •Key Learnings

5. Give your developers a problem. They will code you a solution Inspired by Farrah Campbell and Ben Kehoe talks on the “Serverless Mindset”

6. What are we talking about?

7. How do we get here?

8. How do AWS APIs Work?

9. Clients make a Request

10. Integration Request

11. Service Integration called

12. Service Response Returns

13. Response mapped to Method

14. API Magic has happened !!!

15. Where is the magic?

16. Serverless Framework: Its all in the Resources!

17. See Zero Code!

18. What do we need ?

19. SQS Queue

20. API Gateway Role

21. API Method

22. API Deployment

23. API Method is the Secret Type: AWS::ApiGateway::Method Properties: Integration: IntegrationHttpMethod: POST Type: AWS Credentials: !GetAtt apigSqsSendmessageRole.Arn Uri: !Join - "/" - - 'arn:aws:apigateway:${aws:region}:sqs:path’ - ${aws:accountId} - !GetAtt sqsQueue.QueueName PassthroughBehavior: NEVER

24. Request mapping with Velocity Templates (VTL) Type: AWS::ApiGateway::Method Properties: Integration: PassthroughBehavior: NEVER RequestParameters: integration.request.header.Content-Type: "'application/x-www-form-urlencoded'" RequestTemplates: application/json: "Action=SendMessage&MessageBody=$input.json('$')"

25. Integration Response

26. Response mapping with VTL Type: AWS::ApiGateway::Method Properties: Integration: IntegrationResponses: - StatusCode: "200" ResponseTemplates: application/json: |- #set ($root=$input.path('$')){ "resuest_id": "$root.SendMessageResponse.ResponseMetadata.RequestId", "message_id": "$root.SendMessageResponse.SendMessageResult.MessageId", "accepted": "ok" }

27. The Full API Method Template

28. Key Learnings • Direct API Gateway Integrations are not hard • Its all just Cloud Formation J • All the hard work is done by the API Method • Using AWS::Apigateway::Deployment is tricky • Deploys first time but never again since it never changes • Needed to use aws-cli to create new deployments L

29. Zero Code does work! We can create solutions with ZERO CODE !

30. References • The blog - https://blog.walmsles.io/serverless-integration-zero-code • The Github Repo – https://github.com/walmsles/zero-code-api-sqs • Farrah Campbell – https://www.youtube.com/watch?v=mItY0tI-C_o&t=8s • Ben Kehoe – https://www.youtube.com/watch?v=8Rzv68K8ZOY • Alex Debrie – https://www.alexdebrie.com/posts/api-gateway-elements/

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Serverless integration zero code

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