The API Gateway exposes a POST endpoint to receive notification requests from lambda function that invokes a SNS.
The SNS sends the message to 2 topics. (sms and email)
see lambda-send-sms-and-email.md
• Backend can only be ssh accessed via bastion host.
• Backend allows frontend http requests on port 80.
• Frontend and bastion host inside a public subnet and backend inside a private subnet.
• Nginx redirects frontend requests to Api in a isolated URL.
• Nginx allow https access to frontend on port 443.
• IG allows public subnet to access internet.
• NAT Gateway allows private subnet to access internet.
• Api access DynamoDB via VPC endpoint.
A microservice high scalable to convert HTML into PDF.
• The SQS receives a HTML as input.
• SQS triggers EventBridge Pipe which then creates ECS Controller.
• ECS controller manages the ECS Generate PDF and ECS Merge PDF.
• ECS controller pulls SQS and creates ECS Generate PDF instances and wait them to finish the tasks.
• The number of ECS Generate instances depends on the number of PDF pages.
• ECS Generate PDF polls SQS messages and uses the HTML to generate PDF using puppetter browser chromium and then stores on S3.
• Once all PDF pages are created ECS Controller creates the ECS Merge PDF.
• ECS Merge PDF merges all pages into one final PDF.