(aws-ec2): AddRouteOptions does not include RouterType for Transit Gateway and other types

[lukevo247]

General Issue

Users are unable to specify transit gateway as a routertype when specifying a route for vpc subnets. As well as a variety of other types available through the AWS console.

The Question

I want to be able to provision routes to my transit gateway. As it stands, not all of the router_type are available via CDK.

The console allows users to specify a variety of options not yet available in CDK: Transit Gateway, Virtual Private Gateway, Outposts Local Gateway, etc.

None of the existing options work, including aws_ec2.RouterType.GATEWAY which specifies an Internet Gateway.

Example:

for subnet in range(len(vpc.private_subnets)):
                (vpc.private_subnets[subnet]).add_route("StaticRoute",
                router_id=tgw_id,
                router_type=aws_ec2.RouterType.GATEWAY,
                destination_cidr_block="10.0.0.0/24"
                )

Is there a way around this to add a route to a transit gateway to my route table?
Link to documentation: https://docs.aws.amazon.com/cdk/api/v1/python/aws_cdk.aws_ec2/RouterType.html#aws_cdk.aws_ec2.RouterType

CDK CLI Version

1.140.0

Framework Version

1.140.0

Node.js Version

8.1.2

OS

macOS 12.2.1

Language

Python

Language Version

Python 3.9.10

Other information

This appears to be a missing feature/bug in all of the languages across CDK v1 and v2.

[peterwoodworth]

We currently don't support this, however this should be a pretty simple fix. We accept contributions 🙂

In the meantime, you can use escape hatches to set the transitGatewayId property on the underlying CfnRoute created by addRoute.

[bearrito]

I'm not familiar with using the escape hatches. What would this look like for TGW?

[github-actions]

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