dynamodb-table-update-lambda

Lambda function to handle event coming from dynamodb stream on update/insert/delete

Build

This is a maven project, just do mvn clean package

Deploy lambda to AWS

Remove lambda from AWS: mvn lambda:delete-lambda

Deploy lambda to AWS: mvn clean package lambda:deploy-lambda

mind that code uses profiles and properties:

Property	Description
accessKey (Optionally: uncomment to use it)	Your user's AWS access key.
secretKey (Optionally: uncomment to use it)	Your user's AWS secret key.
lambda.functionCode	jar file for a Java8 lambda function
lambda.version
lambda.publish	used to request AWS Lambda to update the Lambda function and publish a version as an atomic operation
lambda.forceUpdate	used to force update of existing configuration
lambda.functionNameSuffix
lambda.region	AWS region to deploy function to
lambda.s3.bucket	The AWS S3 bucket to which to upload your code from which it will be deployed to Lambda.
lambda.role.arn	The AWS role ARN - role which lambda user will use for execution. Should be able to execute lambda, perform the GetRecords, GetShardIterator, DescribeStream, and ListStreams Actions on your DynamoDB stream

Pls see more at lambda-maven-plugin

Prerequisites

AWS account
DynamoDB with at least one table
aws key/secret on your file system in .aws/credentials file (unless you specify it directly in pom (accessKey/secretKey))

Setup dynamoDB stream:

sign-in your AWS console
Go to DynamoDB Service page
Select table you want to setup stream for
Switch to 'Overview' tab
click "Manage stream" button
select desired "view type". "New and old images" is default and in most cases should perfectly fit your goals:

Log sample from cloudwatch

To access lambda log:

Go to AWS console
Open lambda service
select your function
Open 'Monitoring' tab
Go to "Viw logs"

Sample log for one stream event looks like below

START RequestId: 225c79c0-4fc3-4c4b-86f4-848c17a50b06 Version: $LATEST

12:50:17.484 [main] INFO com.github.joraclista.DynamoDbUpdatesHandler - handleRequest input.size = 1 
12:50:17.489 [main] INFO com.github.joraclista.DynamoDbUpdatesHandler - Event id = 5f587c64dcd1eb2739fbf16ec42b085b; name = MODIFY; source = aws:dynamodb; source.arn = arn:aws:dynamodb:us-east-1:324609709848:table/Products/stream/2017-02-15T10:26:02.608;

12:50:17.509 [main] INFO com.github.joraclista.DynamoDbUpdatesHandler - tableName = [Products]; region = us-east-1 

12:50:18.149 [main] INFO com.github.joraclista.handlers.ModifyRecordHandler - handle: newImage = {images=[jadore-you/img_7820__17314-1478694744-332-500.jpg, jadore-you/img_7820__17314-1478694744-244-365.jpg, jadore-you/img_7824__60490-1478694745-244-365.jpg], added=2016-11-10T15:07:25.062Z, finalStock=18, commentSummary={starsAverage=0, starsCount=0, starsCount1=0, starsCount5=0, starsCount4=0, starsCount3=0, starsCount2=0, starsValue=0}, title=Haley Mini Glitter Pattern Bardot Dress, version=1, tags=[partyseason, littleblackdress], productPopularity=11, merchantProductId=1963, material=[], merchantId=jadore-you, price=17.5, variations=[{image=jadore-you/img_7820__17314-1478694744-332-500.jpg, images=[jadore-you/img_7820__17314-1478694744-332-500.jpg, jadore-you/img_7820__17314-1478694744-244-365.jpg, jadore-you/img_7824__60490-1478694745-244-365.jpg], color=Black, size=S, sizeSelect=UK 8, sKU=1963blackuk-8, stock=2}, {image=jadore-you/img_7820__17314-1478694744-332-500.jpg, images=[jadore-you/img_7820__17314-1478694744-332-500.jpg, jadore-you/img_7820__17314-1478694744-244-365.jpg, jadore-you/img_7824__60490-1478694745-244-365.jpg], color=Black, size=S, sizeSelect=UK 10, sKU=1963blackuk-10, stock=2}, {image=jadore-you/img_7820__17314-1478694744-332-500.jpg, images=[jadore-you/img_7820__17314-1478694744-332-500.jpg, jadore-you/img_7820__17314-1478694744-244-365.jpg, jadore-you/img_7824__60490-1478694745-244-365.jpg], color=Black, size=M, sizeSelect=UK 12, sKU=1963blackuk-12, stock=2}, {image=jadore-you/img_7820__17314-1478694744-332-500.jpg, images=[jadore-you/img_7820__17314-1478694744-332-500.jpg, jadore-you/img_7820__17314-1478694744-244-365.jpg, jadore-you/img_7824__60490-1478694745-244-365.jpg], color=Black, size=M, sizeSelect=UK 14, sKU=1963blackuk-14, stock=2}], modified=2017-02-17T20:08:55.288Z, currency=GBP, id=9e5caccb-fb8e-43f1-9acc-32edd8d20a15, slug=haley-mini-glitter-pattern-bardot-dress_36ed123a-1a34-318d-9fc1-109f48bb2d26, status=PUBLIC}; oldImage = {images=[jadore-you/img_7820__17314-1478694744-332-500.jpg, jadore-you/img_7820__17314-1478694744-244-365.jpg, jadore-you/img_7824__60490-1478694745-244-365.jpg], added=2016-11-10T15:07:25.062Z, finalStock=18, commentSummary={starsAverage=0, starsCount=0, starsCount1=0, starsCount5=0, starsCount4=0, starsCount3=0, starsCount2=0, starsValue=0}, title=Haley Mini Glitter Pattern Bardot Dress, version=1, tags=[partyseason, littleblackdress], productPopularity=111, merchantProductId=1963, material=[], merchantId=jadore-you, price=17.5, variations=[{image=jadore-you/img_7820__17314-1478694744-332-500.jpg, images=[jadore-you/img_7820__17314-1478694744-332-500.jpg, jadore-you/img_7820__17314-1478694744-244-365.jpg, jadore-you/img_7824__60490-1478694745-244-365.jpg], color=Black, size=S, sizeSelect=UK 8, sKU=1963blackuk-8, stock=2}, {image=jadore-you/img_7820__17314-1478694744-332-500.jpg, images=[jadore-you/img_7820__17314-1478694744-332-500.jpg, jadore-you/img_7820__17314-1478694744-244-365.jpg, jadore-you/img_7824__60490-1478694745-244-365.jpg], color=Black, size=S, sizeSelect=UK 10, sKU=1963blackuk-10, stock=2}, {image=jadore-you/img_7820__17314-1478694744-332-500.jpg, images=[jadore-you/img_7820__17314-1478694744-332-500.jpg, jadore-you/img_7820__17314-1478694744-244-365.jpg, jadore-you/img_7824__60490-1478694745-244-365.jpg], color=Black, size=M, sizeSelect=UK 12, sKU=1963blackuk-12, stock=2}, {image=jadore-you/img_7820__17314-1478694744-332-500.jpg, images=[jadore-you/img_7820__17314-1478694744-332-500.jpg, jadore-you/img_7820__17314-1478694744-244-365.jpg, jadore-you/img_7824__60490-1478694745-244-365.jpg], color=Black, size=M, sizeSelect=UK 14, sKU=1963blackuk-14, stock=2}], modified=2017-02-17T20:08:55.288Z, currency=GBP, id=9e5caccb-fb8e-43f1-9acc-32edd8d20a15, slug=haley-mini-glitter-pattern-bardot-dress_36ed123a-1a34-318d-9fc1-109f48bb2d26, status=PUBLIC}; 

END RequestId: 225c79c0-4fc3-4c4b-86f4-848c17a50b06

REPORT RequestId: 225c79c0-4fc3-4c4b-86f4-848c17a50b06	
Duration: 238.21 ms	
Billed Duration: 300 ms 
Memory Size: 512 MB	
Max Memory Used: 58 MB

Test

for testing purporse valid jsons for incoming lambda data is used, please see in test/resorces folder