data source/service: Add data source for service

[YakDriver]

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Closes #16641

Output from acceptance tests (us-west-2):

% make testacc TESTS=TestAccMetaService_ PKG=meta
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/meta/... -v -count 1 -parallel 20 -run='TestAccMetaService_'  -timeout 180m
--- PASS: TestAccMetaService_unsupported (12.21s)
--- PASS: TestAccMetaService_byParts (12.21s)
--- PASS: TestAccMetaService_byDNSName (12.21s)
--- PASS: TestAccMetaService_basic (12.21s)
--- PASS: TestAccMetaService_byReverseDNSName (12.22s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/meta	13.586s
% make testacc TESTS=TestInvert PKG=meta
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/meta/... -v -count 1 -parallel 20 -run='TestInvert'  -timeout 180m
--- PASS: TestInvertStringSlice (0.00s)
    --- PASS: TestInvertStringSlice/DNS_Suffix (0.00s)
    --- PASS: TestInvertStringSlice/Ordered_List (0.00s)
    --- PASS: TestInvertStringSlice/Unordered_List (0.00s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/meta	1.309s

Output from acceptance tests (GovCloud):

% make testacc TESTS='TestAccMetaService_|TestInvert' PKG=meta
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/meta/... -v -count 1 -parallel 20 -run='TestAccMetaService_|TestInvert'  -timeout 180m
--- PASS: TestInvertStringSlice (0.00s)
    --- PASS: TestInvertStringSlice/DNS_Suffix (0.00s)
    --- PASS: TestInvertStringSlice/Ordered_List (0.00s)
    --- PASS: TestInvertStringSlice/Unordered_List (0.00s)
--- PASS: TestAccMetaService_byDNSName (12.10s)
--- PASS: TestAccMetaService_byReverseDNSName (12.10s)
--- PASS: TestAccMetaService_unsupported (12.10s)
--- PASS: TestAccMetaService_basic (12.11s)
--- PASS: TestAccMetaService_byParts (12.11s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/meta	13.423s

[bflad]

Let's clear up #16641 (comment) before continuing here. We may also want to clarify the attributes better since this should not be EC2 specific and support forward and reverse DNS information.

[zhelding]

Pull request #21306 has significantly refactored the AWS Provider codebase. As a result, most PRs opened prior to the refactor now have merge conflicts that must be resolved before proceeding.

Specifically, PR #21306 relocated the code for all AWS resources and data sources from a single aws directory to a large number of separate directories in internal/service, each corresponding to a particular AWS service. This separation of code has also allowed for us to simplify the names of underlying functions -- while still avoiding namespace collisions.

We recognize that many pull requests have been open for some time without yet being addressed by our maintainers. Therefore, we want to make it clear that resolving these conflicts in no way affects the prioritization of a particular pull request. Once a pull request has been prioritized for review, the necessary changes will be made by a maintainer -- either directly or in collaboration with the pull request author.

For a more complete description of this refactor, including examples of how old filepaths and function names correspond to their new counterparts: please refer to issue #20000.

For a quick guide on how to amend your pull request to resolve the merge conflicts resulting from this refactor and bring it in line with our new code patterns: please refer to our Service Package Refactor Pull Request Guide.

[YakDriver]

Let's clear up #16641 (comment) before continuing here. We may also want to clarify the attributes better since this should not be EC2 specific and support forward and reverse DNS information.

All of these items have been addressed.

[gdavison]

Looks good! 🚀

One comment

[gdavison]

I'm not a fan of adding a default here: if the practitioner is looking up a specific service, they should specify it.

[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!

[antonbabenko]

Can we also have dns_prefix added (value - amazonaws.com)? It would be helpful to generate global AWS Service Names like this - https://github.com/kubernetes-sigs/aws-load-balancer-controller/blob/694a0b14184e388806f9f34be0dd9075aa8fb0a7/docs/install/iam_policy.json#L12

Here is where we need it - https://github.com/terraform-aws-modules/terraform-aws-iam/pull/189/files/aa480435226ed9f9b4fc4a247ee9f6cabe1938ad#diff-eaa3db68ce5b0e6250b8b884997ba06f95e89312aee5c8bac7d9b703c7732257R507

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.