Give Lambda a static IP

[mzepol07]

I need to give my lambda static IP so that it can be whitelisted by another service.
I found a blog that lays out these steps, but I want to be able to do them in CDK (Python)
Create a new VPC to run your code in (or use an existing VPC)
Create a new Internet Gateway to communicate with the Internet from inside your VPC
Create a Public Subnet and add a new route to the route table which routes to your Internet Gateway from 0.0.0.0/0
Create a new Elastic IP address.
Create a new NAT Gateway and assign it to the Public Subnet and Elastic IP address that you just created.
Create a Private Subnet and add a new route to the route table which routes to your NAT Gateway from 0.0.0.0/0

I have an existing VPC and have created the Lambda function. Then I created a private subnet using the ec2 class and added a nat gateway to it..

 # create a public subnet
public_subnet = ec2.PublicSubnet(
    self,
    id=f"external-lambda-subnet-{env_label}",
    vpc_id=vpc_id
)
nate_gateway = public_subnet.add_nat_gateway()

Here are my issues...
How do I create an internet gateway within the VPC?
How do I get back from nat gateway ID from the add_nat_gateway call? I don't know the structure of that response body
How do I add routes to the public subnet within CDK? I imagine this will be a cfn fix.

Anyway, just kinda lost ovrall. Let me know if you have any tips or examples.
Thanks.

[peterwoodworth]

Please view our API ref on EC2, it should answer your questions. For example, the return type of addNatGateway will reveal the id from this prop https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_ec2.CfnNatGateway.html#attrnatgatewayid.

You can add routes to the subnet with the addRoute method

Docs on internet gateway here https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_ec2-readme.html#accessing-the-internet-gateway