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AWS Environment -- Lamdba function pulling from RDS/PostgreSQL instance and pushing through API Gateway.

SecretsManager makes it easy enough to pass static data like usernames and passwords to the Lambda function. Terraform, however, prohibits the use of dynamic variables in its variable resource. As such, Terraform cannot define a host and pass the host to the Lambda function through SecretsManager.

I've considered exporting the variable to the environment at the end of the Terraform script. But this would not export to the same machine that the Lambda is running on, correct? SecretsManager is obviously a hacked-ass way to do it in anyway. And all the resources I'm finding just seem to have some manual in between during the creation of the RDS instance and the Lambda function.

Thank you in advanced.

Terraform :

I am trying to create IaC for an AWS API Gateway with two stages; development and production, with each stage invoking a different Lambda function.

I would like the end result to be:

• If a user hits the development stage, they will invoke the development Lambda function
• If a user hits the production stage, they will invoke the production Lambda function

My code currently looks like this, I've removed some resources that aren't relevant to the question:

I have terraform setting as below: