Building applications with Serverless Framework and AWS Lambda - JavaZone 2019
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The document outlines a workshop by Fredrik Vraalsen on building applications with the serverless framework and AWS Lambda, covering setup, deployment, and use cases of serverless architecture. It emphasizes key features such as quick deployment, pay-per-use, and auto-scaling. Throughout the presentation, examples and exercises illustrate the creation of backend APIs, event processing, and orchestration using AWS Lambda and related services.
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![Hello World
def hello(event, context):
name = event["queryStringParameters"]["name"]
return {
"statusCode": 200,
"body": f"Hello, {name}!",
"headers": {
"Content-Type": "text/plain"
}
}
12](https://image.slidesharecdn.com/buildingapplicationswithserverlessframeworkandawslambda-javazone2019-190910045016/85/Building-applications-with-Serverless-Framework-and-AWS-Lambda-JavaZone-2019-12-320.jpg)
![Hello HTTP!
def hello(event, context):
name = event["pathParameters"]["name"]
35](https://image.slidesharecdn.com/buildingapplicationswithserverlessframeworkandawslambda-javazone2019-190910045016/85/Building-applications-with-Serverless-Framework-and-AWS-Lambda-JavaZone-2019-35-320.jpg)
![Hello HTTP!
def hello(event, context):
name = event["pathParameters"]["name"]
response = { "message": f"Hello, {name}!" }
36](https://image.slidesharecdn.com/buildingapplicationswithserverlessframeworkandawslambda-javazone2019-190910045016/85/Building-applications-with-Serverless-Framework-and-AWS-Lambda-JavaZone-2019-36-320.jpg)
![Hello HTTP!
import json
def hello(event, context):
name = event["pathParameters"]["name"]
response = { "message": f"Hello, {name}!" }
return {
"statusCode": 200,
"body": json.dumps(response)
}
37
https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-input-format](https://image.slidesharecdn.com/buildingapplicationswithserverlessframeworkandawslambda-javazone2019-190910045016/85/Building-applications-with-Serverless-Framework-and-AWS-Lambda-JavaZone-2019-37-320.jpg)
![handler.py
def handle_event(event, context):
for record in event["Records"]:
msg = record["Sns"]["Message"]
print(f"Got event: {msg}")
52
https://docs.aws.amazon.com/lambda/latest/dg/with-sns.html](https://image.slidesharecdn.com/buildingapplicationswithserverlessframeworkandawslambda-javazone2019-190910045016/85/Building-applications-with-Serverless-Framework-and-AWS-Lambda-JavaZone-2019-52-320.jpg)
![serverless.yml
definition:
StartAt: ValidateTemperature
States:
ValidateTemperature:
Type: Task
Resource:
Fn"::GetAtt: [ValidateTemperatureLambdaFunction, Arn]
Next: EnrichLocation
EnrichLocation:
Type: Task
Resource:
Fn"::GetAtt: [EnrichLocationLambdaFunction, Arn]
End: True
59](https://image.slidesharecdn.com/buildingapplicationswithserverlessframeworkandawslambda-javazone2019-190910045016/85/Building-applications-with-Serverless-Framework-and-AWS-Lambda-JavaZone-2019-59-320.jpg)
![handler.py
def validate_temperature(event, context):
temperature = int(event["temperature"])
if temperature < -20:
raise ValueError("Too cold!")
if temperature > 30:
raise ValueError("Too warm!")
return event
def enrich_location(event, context):
event["location"] = "Berlin"
return event
60](https://image.slidesharecdn.com/buildingapplicationswithserverlessframeworkandawslambda-javazone2019-190910045016/85/Building-applications-with-Serverless-Framework-and-AWS-Lambda-JavaZone-2019-60-320.jpg)
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- 1. Building applications with Serverless Framework and AWS Lambda Fredrik Vraalsen JavaZone 2019 © Thomas Ekströmhttp://github.com/fredriv/serverless-lambda-workshop
- 2. http://github.com/fredriv/serverless-lambda-workshop Clone Git repo and follow setup instructions in README: Install npm, pip, Serverless Framework, Docker, awscli-local Pre-fetch Docker images: docker pull localstack/localstack:0.10.2 docker pull lambci/lambda:python3.7 2
- 3. Workshop agenda Why serverless? AWS Lambda Serverless Framework Configuration and deployment Backend API 3 Event processing Orchestration Performance Packaging Testing http://github.com/fredriv/serverless-lambda-workshop
- 4. Who is Fredrik? Oslo, Norway Developer for 22+ years Data Platform Architect at Origo (City of Oslo) Dad, cyclist, gamer, sci-fi fan, photo geek 4
- 5. The Story of Tim 5 https://www.youtube.com/watch?v=xPciIWM3ztQ
- 6. 6 Analytics and insights External data sources, e.g. land registry, weather, census data, etc. Sensors Database extracts Open data Share with businesses New services, cross sector Data catalog Transform, clean Simplify, prepare, publish Professional systems Patient data, school systems, archives, etc Government registers DATA PLATFORM
- 7. Serverless / Lambda in our Data Platform Microservices - REST APIs Processing pipeline components • Transformations • Validation Scheduled jobs • Data integrations, backups, … 7http://github.com/fredriv/serverless-lambda-workshop
- 8. Why serverless? No servers to manage Quick deployment Auto scaling Pay-per-use 8http://github.com/fredriv/serverless-lambda-workshop
- 10. AWS Lambda Function-as-a-Service (FaaS) Serverless Pay for compute time (+ memory) 10http://github.com/fredriv/serverless-lambda-workshop
- 11. 11 Simple Notification Service (SNS) Simple Queue Service (SQS) Simple Storage Service (S3) Kinesis API Gateway Step Functions DynamoDB
- 12. Hello World def hello(event, context): name = event["queryStringParameters"]["name"] return { "statusCode": 200, "body": f"Hello, {name}!", "headers": { "Content-Type": "text/plain" } } 12
- 13. Lambda demo 13
- 14. Manual configuration and deployment 14© Fredrik Vraalsen
- 15. Infrastructure as Code 15http://github.com/fredriv/serverless-lambda-workshop
- 16. Infrastructure as Code Configuration 16http://github.com/fredriv/serverless-lambda-workshop
- 18. Serverless Framework Configure and deploy serverless applications Multi-cloud 18http://github.com/fredriv/serverless-lambda-workshop
- 19. Configuration and deployment In git repo: 1_hello 19http://github.com/fredriv/serverless-lambda-workshop
- 20. Templates sls create "--template aws-python3 "--name hello 20 https://serverless.com/framework/docs/providers/aws/cli-reference/create/
- 21. serverless.yml service: hello provider: name: aws region: eu-west-1 runtime: python3.7 functions: hello: handler: handler.hello 21
- 22. handler.py def hello(event, context): return "Hello, world!" 22
- 23. Deployment 23
- 24. Deployment 24
- 25. Deployment 25
- 26. Deployment 26
- 28. Undeploy 28
- 29. LocalStack Run mock AWS services locally Error injection Run in Docker or locally Integrations with test frameworks 29 https://localstack.cloud/
- 30. Exercise 1 - Hello! Open directory 1_hello Do exercises in README.md 30http://github.com/fredriv/serverless-lambda-workshop
- 31. Lambda use cases Backend APIs Web applications Event processing File processing ETL 31http://github.com/fredriv/serverless-lambda-workshop
- 32. Lambda use cases Backend APIs Web applications Event processing File processing ETL 32http://github.com/fredriv/serverless-lambda-workshop
- 33. Backend API In git repo: 2_hello_http https://serverless.com/framework/docs/providers/aws/events/apigateway/ 33http://github.com/fredriv/serverless-lambda-workshop
- 34. Hello HTTP! functions: hello: handler: handler.hello events: - http: path: hello/{name} method: get 34
- 35. Hello HTTP! def hello(event, context): name = event["pathParameters"]["name"] 35
- 36. Hello HTTP! def hello(event, context): name = event["pathParameters"]["name"] response = { "message": f"Hello, {name}!" } 36
- 37. Hello HTTP! import json def hello(event, context): name = event["pathParameters"]["name"] response = { "message": f"Hello, {name}!" } return { "statusCode": 200, "body": json.dumps(response) } 37 https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-input-format
- 38. Deploy 38
- 42. Exercise 2 - Hello HTTP! Open directory 2_hello_http Do exercises in README.md 42http://github.com/fredriv/serverless-lambda-workshop
- 43. Documentation 43
- 44. Documentation Plugin: serverless-aws-documentation Request content, parameters, responses, headers Swagger / OpenAPI In git repo: 3_hello_documentation 44http://github.com/fredriv/serverless-lambda-workshop
- 45. Documentation functions: hello: handler: handler.hello events: - http: path: hello/{name} method: get documentation: description: "Generate a personalized greeting" pathParams: - name: "name" description: "Name of person to be greeted" required: true methodResponses: - statusCode: "200" responseModels: application/json: "HelloResponse" 45
- 46. Documentation custom: documentation: models: - name: HelloResponse description: "Greeting response" contentType: "application/json" schema: ${file(models/hello-response.yml)} plugins: - serverless-aws-documentation 46
- 47. Documentation 47
- 48. Triggering Lambda functions API Gateway Application load balancer SNS topic SQS queue Kinesis DynamoDB S3 48 Step functions Websocket IoT Alexa CloudWatch Cognito Schedule https://serverless.com/framework/docs/providers/aws/events/
- 49. Triggering Lambda functions API Gateway Application load balancer SNS topic SQS queue Kinesis DynamoDB S3 49 Step functions Websocket IoT Alexa CloudWatch Cognito Schedule https://serverless.com/framework/docs/providers/aws/events/
- 50. Event processing In git repo: 4_event_processing https://serverless.com/framework/docs/providers/aws/events/sns/ https://serverless.com/framework/docs/providers/aws/events/sqs/ https://serverless.com/framework/docs/providers/aws/events/streams/ 50http://github.com/fredriv/serverless-lambda-workshop
- 51. serverless.yml functions: handle_event: handler: handler.handle_event events: - sns: my-events 51
- 52. handler.py def handle_event(event, context): for record in event["Records"]: msg = record["Sns"]["Message"] print(f"Got event: {msg}") 52 https://docs.aws.amazon.com/lambda/latest/dg/with-sns.html
- 53. Publish event 53
- 54. Publish event 54
- 55. Exercise 4 - Event processing Open directory 4_event_processing Do exercises in README.md 55http://github.com/fredriv/serverless-lambda-workshop
- 57. Orchestration In git repo: 5_orchestration https://serverless.com/plugins/serverless-step-functions/ 57http://github.com/fredriv/serverless-lambda-workshop
- 58. serverless.yml functions: validateTemperature: handler: handler.validate_temperature enrichLocation: handler: handler.enrich_location stepFunctions: stateMachines: ProcessTemperatures: name: ProcessTemperatures events: - http: path: temperatures method: post 58
- 59. serverless.yml definition: StartAt: ValidateTemperature States: ValidateTemperature: Type: Task Resource: Fn"::GetAtt: [ValidateTemperatureLambdaFunction, Arn] Next: EnrichLocation EnrichLocation: Type: Task Resource: Fn"::GetAtt: [EnrichLocationLambdaFunction, Arn] End: True 59
- 60. handler.py def validate_temperature(event, context): temperature = int(event["temperature"]) if temperature < -20: raise ValueError("Too cold!") if temperature > 30: raise ValueError("Too warm!") return event def enrich_location(event, context): event["location"] = "Berlin" return event 60
- 61. Running 61
- 62. 62
- 63. 63
- 64. 64
- 65. Exercise 5 - Orchestration Open directory 5_orchestration Do exercises in README.md 65http://github.com/fredriv/serverless-lambda-workshop
- 67. Cold start 67© Fredrik Vraalsen
- 69. Lambda lifecycle 1 container = 1 execution Spin up more on demand Reuse: Freeze & Thaw VPCs require ENIs ==> Slow cold start 69
- 70. Packaging Deploy zip file Bundle dependencies Layers Linux! 70 https://serverless.com/plugins/serverless-python-requirements/
- 71. Testing separate business logic ==> unit tests, mocking Python: moto library sls invoke local -f function-name kinesalite, dynalite, local dynamodb (docker) LocalStack 71 https://serverless.com/framework/docs/providers/aws/guide/testing/
- 72. Putting it all together 72http://github.com/fredriv/serverless-lambda-workshop
- 73. Exercise 6 - All Together Now Open directory 6_all_together Do exercises in README.md 73http://github.com/fredriv/serverless-lambda-workshop
- 74. Wrap up AWS Lambda • FaaS, simple, pay-as-you-go, scalable Serverless Framework • Configuration, deployment, testing, plugins • Easy = simpler, Hard = ? • Continuously developed 74
- 75. More things Infrastructure Access control (IAM) API Gateway integrations • Lambda Proxy vs Lambda integration Validation Versioning 75