aws.region API

[Chriscbr]

Use Case

As a user, when I'm compiling a Wing app to one of the AWS platforms, I'd like to have a way to easily access the AWS region my app's resources are being deployed to so that I can use it for constructing ARNs and other things like that.

We already use region information in the TypeScript implementations of some of the built-in cloud classes:

wing/libs/wingsdk/src/target-tf-aws/api.ts

Lines 319 to 322 in 734a760

	const app = App.of(this) as App;
	this.id = id;
	this.region = app.region;
	this.accountId = app.accountId;

Proposed Solution

bring aws;

let region = aws.region; // str

Implementation Notes

By default the AWS Terraform Provider operates in a single region and also CloudFormation runs deployments in a single region.

The implementation of aws.region needs to somehow depend on which target you're compiling to (tf-aws or awscdk).

Component

SDK

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[eladb]

The "correct" way to obtain the current region and account is using a terraform data element.

See https://github.com/winglang/winglibs/blob/main/containers/aws.w as an example.

I suspect a global aws.region won't work without tree scope, so it will need to be something like: aws.Region.of(this) or aws.Environment.of(this).region

[Chriscbr]

Mmm - I see, yeah that makes sense.