data source/service: Add a service data source

[YakDriver]

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Description

It would be helpful to have a data source to help with service names such as com.amazonaws.us-east-1.s3. While these components can be composed from existing data sources, a new data source would be convenient for practitioners and provide a way to work backwards from a service name to regions, service prefixes, and service IDs.

This allows practitioners and maintainers to create configurations that can move more easily between partitions. This is a next step following on with data sources such as aws_region and aws_partition.

New or Affected Resource(s)

• aws_service

Potential Terraform Configuration

resource "aws_vpc" "test" {
  cidr_block = "10.0.0.0/16"

  tags = {
    Name = %[1]q
  }
}

data "aws_service" "s3" {
  service_id = "s3"
}

resource "aws_vpc_endpoint" "test" {
  vpc_id       = aws_vpc.test.id
  service_name = data.aws_service_name.s3.reverse_dns_name
}

References

• ds/partition: Add service_prefix to aws_partition #16639

[DrFaust92]

Question, how does this differ from the aws_vpc_endpoint_service data source?

[bflad]

@DrFaust92 the missing context here is that this data source would initially operate without an API call. 👍

I think the naming could be improved though, since an aws_service_name sounds like "EC2" to me and we try to leave off any particular attributes when naming data sources (aws_subnet_ids having ARNs 😢 ). Since the expectation here would be that is supports forward and reverse DNS entries, and potentially other attributes in the future, maybe aws_service is more apt?

[YakDriver]

I always like shorter; aws_service sounds good to me.

As for attributes, what about:

• dns_name - e.g., s3.ap-northeast-1.amazonaws.com.cn
• partition -
• region - e.g., ap-northeast-1
• reverse_dns_name - e.g., cn.com.amazonaws.ap-northeast-1.s3
• reverse_dns_prefix - e.g., com.amazonaws
• service_id - e.g., s3

Would there be any value in an attribute like this?

• supported - boolean of whether service is listed in partition services (would document that not 100% accurate)

[github-actions]

This functionality has been released in v4.1.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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