Tableta Inmultirii AWS Lambda

Lambda AWS code and configuration for Tableta Inmultirii

The code for AWS Lambda and role definition were extracted using utilities in raducrs/aws-lambda-save-configuration

This AWS lambda function were published also to serve as examples in creating a serveless architecture in AWS

Features by technology

DynamoDB

getItem

• api\TI-AUser-ConfirmationGet

updateItem

• api\TI-AUser-ConfirmationGet - by key
• api\TI-AUser-DonationPost - with optimistic atomic increment (val = val + 1)
• api\TI-DUser-PostDonations - with optimistic atomic increment (val = val + 1)
• api\TI-PUser-StatusPut - chained from query result

putItem

• api\TI-AUser-DonationPost
• api\TI-DUser-PostDonations

query

• api\TI-DUser-GetDonations - secondary index with equality
• api\TI-PUser-AcceptedGet - between attribute for sort key and equality for key secondary index
• api\TI-PUser-AcceptedPost - sort key and equality for key
• api\TI-PUser-TargetedGet - composed key and read in batch

batchWriteItem

• api\TI-PUser-AcceptedPost - batch DeleteRequest delete by key and sort key
• async\TI-LocationPopulate - write batched data

deleteItem

• api\TI-PUser-DonationDelete - by key and sort key

batchGetItem

• api\TI-PUser-LocationGet - from async processing of query (partial) results in batch (simulates a join)
• api\TI-Stats-GadgetsGet

stream event

• async\TI-SlackAlert - INSERT
• async\TI-SlackAlert - MODIFY

Lambda

InvokeAsync

• api\TI-AUser-ConfirmationGet
• api\TI-DUser-PostDonations

OpenCV

• imageprocessing\TI-ImageChalk

AWS SES

Create Template

• api\TI-AUser-DonationPost

Send Email Template

• api\TI-AUser-DonationPost

S3

getSignedUrlPromise

• api\TI-UploadGetSignedUrl

put_object

• imageprocessing\TI-ImageChalk

notification of upload to bucket

• async\TI-SlackAlert

Cognito

Notification

• async\TI-SlackAlert - PostAuthentication_Authentication
• async\TI-SlackAlert - PreSignUp_SignUp
• async\TI-SlackAlert - PostConfirmation_ConfirmSignUp

Various

Image Processing

• imageprocessing\TI-ImageChalk - resize
• imageprocessing\TI-ImageChalk - apply filters
• imageprocessing\TI-ImageChalk - pad to fit a given image ratio - userful for Facebook preview which requires 1:1.91 ratio

UUID generator

• api\TI-AUser-DonationPost

Decode JWT

• api\TI-DUser-GetDonations

Roles

For the description of the policies you need to check the Cloud Formation Repo and the created resources. The S3 and DynamoDB policies are created and attached via templates.

TI-APIGatewayS3

Allows API Gateway to read S3 content

Attached policies:

AmazonAPIGatewayPushToCloudWatchLogs
TI-S3PublicAddJSON-Policy

Assume role:

apigateway.amazonaws.com

TI-LambdaGetUploadURL

Retrieves an upload url into the bucket

Attached policies

AWSOpsWorksCloudWatchLogs
TI-UploadToPrivateFolder-Policy

Assume role:

lambda.amazonaws.com

TI-LambdaImageChalk

Allows Lambda functions to call AWS services on your behalf.

Attached policies:

AWSOpsWorksCloudWatchLogs
TI-WriteToPublicS3
TI-GetLayerChalkBoard-Policy
TI-ReadUploadImages-Policy

Assume role:

lambda.amazonaws.com

TI-LambdaReadDB

Allows Lambda functions to read DynamoDB tables

Attached policies:

AWSOpsWorksCloudWatchLogs
TI-DynamoDBRead-Policy
TI-InvokeLambda-Policy

Assume role:

lambda.amazonaws.com

TI-LambdaReadWriteDB

Allows Lambda functions to write and read to/from DynamoDB

Attached policies:

AWSOpsWorksCloudWatchLogs
TI-SESCreateUpdateSend
TI-DynamoDBRead-Policy
TI-DynamoDBWrite-Policy

Assume role:

lambda.amazonaws.com

TI-LambdaWriteDB

Allows Lambda functions to write to DynamoDB

Attached policies:

AWSOpsWorksCloudWatchLogs
TI-DynamoDBWrite-Policy
TI-InvokeLambda-Policy

Assume role:

lambda.amazonaws.com

TI-SlackPostRole

Allow post to slack

Attached policies

TI-DynamoDB-TargetedDonationsStream-Policy

Assume role:

lambda.amazonaws.com