Chalice AWS Lambda functions for OU Libraries Derivative and PDF Generation

Requirements

• Python 3.9+
• AWS Chalice

Installation

1. Ensure access to AWS and proper permissions.
2. Create 2 AWS SQS queues. The functions deployed by this repo will need the following Action roles to be able to access the queues:
   • sqs:DeleteMessage
   • sqs:GetQueueUrl
   • sqs:ReceiveMessage
   • sqs:SendMessage
3. Modify the values of the following in app.py to match the names of the added queues and the S3 bucket containing bagged files:
   • SQS_QUEUE_DERIV
   • SQS_QUEUE_PDF
   • S3_BUCKET
4. Adjust Default visibility timeout of SQS queues (default is 30 seconds) to match lambda_timeout (default is 60 seconds)
5. Adjust lambda_memory_size in Chalice's config.json to your needs before deploying.
6. To deploy run chalice deploy

TODO

• Create deployment script to setup AWS service dependencies and roles
• Store results in a database

Notes

The following are notes to help with working with AWS Lambda and Chalice

• Error handling and automatic retries in AWS Lambda
• Following serverless best practices with AWS Chalice and Lambda Powertools
• Understanding SQS retries