Error out if ignoreUnsupportedConstraintTraits has no effect
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Now that constraint traits are supported in server SDKs (with some corner case caveats, see #1401), this flag will almost always be useless for those early adopters of constraint traits. It is thus convenient to inform the user that they should remove it. See #2516 (comment).
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RPC v2 CBOR is a new protocol that ~is being added~ has [recently been added](https://smithy.io/2.0/additional-specs/protocols/smithy-rpc-v2.html) to the Smithy specification. _(I'll add more details here as the patchset evolves)_ Credit goes to @jjant for initial implementation of the router, which I built on top of from his [`jjant/smithy-rpc-v2-exploration`](https://github.com/awslabs/smithy-rs/tree/jjant/smithy-rpc-v2-exploration) branch. Tracking issue: #3573. ## Caveats `TODO`s are currently exhaustively sprinkled throughout the patch documenting what remains to be done. Most of these need to be addressed before this can be merged in; some can be punted on to not make this PR bigger. However, I'd like to call out the major caveats and blockers here. I'll keep updating this list as the patchset evolves. - [x] RPC v2 has still not been added to the Smithy specification. It is currently being worked on over in the [`smithy-rpc-v2`](https://github.com/awslabs/smithy/tree/smithy-rpc-v2) branch. The following are prerrequisites for this PR to be merged; **until they are done CI on this PR will fail**: - [x] Smithy merges in RPC v2 support. - [x] Smithy releases a new version incorporating RPC v2 support. - Released in [Smithy v1.47](https://github.com/smithy-lang/smithy/releases/tag/1.47.0) - [x] smithy-rs updates to the new version. - Updated in #3552 - [x] ~Protocol tests for the protocol do not currently exist in Smithy. Until those get written~, this PR resorts to Rust unit tests and integration tests that use `serde` to round-trip messages and compare `serde`'s encoders and decoders with ours for correctness. - Protocol tests are under the [`smithy-protocol-tests`](https://github.com/smithy-lang/smithy/tree/main/smithy-protocol-tests/model/rpcv2Cbor) directory in Smithy. - We're keeping the `serde_cbor` round-trip tests for defense in depth. - [ ] #3709 - Currently only server-side support has been implemented, because that's what I'm most familiar. However, we're almost all the way there to add client-side support. - ~[ ] [Smithy `document` shapes](https://smithy.io/2.0/spec/simple-types.html#document) are not supported. RPC v2's specification currently doesn't indicate how to implement them.~ - [The spec](https://smithy.io/2.0/additional-specs/protocols/smithy-rpc-v2.html#shape-serialization) ended up leaving them as unsupported: "Document types are not currently supported in this protocol." ## Prerequisite PRs This section lists prerequisite PRs and issues that would make the diff for this one lighter or easier to understand. It's preferable that these PRs be merged prior to this one; some are hard prerequisites. They mostly relate to parts of the codebase I've had to touch or ~pilfer~ inspect in this PR where I've made necessary changes, refactors and "drive-by improvements" that are mostly unrelated, although some directly unlock things I've needed in this patchset. It makes sense to pull them out to ease reviewability and make this patch more semantically self-contained. - #2516 - #2517 - #2522 - #2524 - #2528 - #2536 - #2537 - #2531 - #2538 - #2539 - #2542 - #3684 - #3678 - #3690 - #3713 - #3726 - #3752 ## Testing <!--- Please describe in detail how you tested your changes --> <!--- Include details of your testing environment, and the tests you ran to --> <!--- see how your change affects other areas of the code, etc. --> ~RPC v2 has still not been added to the Smithy specification. It is currently being worked on over in the [`smithy-rpc-v2`](https://github.com/awslabs/smithy/tree/smithy-rpc-v2) branch.~ This can only be tested _locally_ following these steps: ~1. Clone [the Smithy repository](https://github.com/smithy-lang/smithy/tree/smithy-rpc-v2) and checkout the `smithy-rpc-v2` branch. 2. Inside your local checkout of smithy-rs pointing to this PR's branch, make sure you've added `mavenLocal()` as a repository in the `build.gradle.kts` files. [Example](8df82fd). 4. Inside your local checkout of Smithy's `smithy-rpc-v2` branch: 1. Set `VERSION` to the current Smithy version used in smithy-rs (1.28.1 as of writing, but [check here](https://github.com/awslabs/smithy-rs/blob/main/gradle.properties#L21)). 2. Run `./gradlew clean build pTML`.~ ~6.~ 1. In your local checkout of the smithy-rs's `smithy-rpc-v2` branch, run `./gradlew codegen-server-test:build -P modules='rpcv2Cbor'`. ~You can troubleshoot whether you have Smithy correctly set up locally by inspecting `~/.m2/repository/software/amazon/smithy/smithy-protocols-traits`.~ ## Checklist <!--- If a checkbox below is not applicable, then please DELETE it rather than leaving it unchecked --> - [ ] I have updated `CHANGELOG.next.toml` if I made changes to the smithy-rs codegen or runtime crates ---- _By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice._
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Now that constraint traits are supported in server SDKs (with some
corner case caveats, see #1401), this flag will almost always be useless
for those early adopters of constraint traits. It is thus convenient to
inform the user that they should remove it.
See #2516 (comment).
Checklist
CHANGELOG.next.tomlif I made changes to the smithy-rs codegen or runtime cratesBy submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.