feat: introduce REST-over-gRPC transcoding by geeknoid · Pull Request #546 · microsoft/oxidizer

geeknoid · 2026-07-05T17:01:09Z

Expose an existing gRPC API as a traditional REST/JSON API in the same
process, driven by google.api.http annotations. The gRPC service is
implemented once; the REST layer is generated at build time and transcodes
requests and responses with minimal runtime overhead. The generated router is
built on a standalone, zero-allocation static router (routerama) that is also
useful on its own.

Crates added:

routerama: dependency-free runtime for a compile-time static HTTP router —
zero-allocation method + path matching returning the matched tag and captured
path variables (with a SIMD segment scanner).
routerama_macros: the routes! procedural macro that generates a static
router inline from a named route enum, with no build.rs required.
routerama_build: build-time code generator that lowers a route set into a
resolve function (a nested match over path segments — a compile-time trie),
reporting genuinely ambiguous routes as a compile_error!.
http_path_template: dependency-free parser for the google.api.http
path-template grammar (literals, *, **, {field=sub} variables, :verb),
with an optional extended grammar for intra-segment prefix/suffix parameters.
rest_over_grpc: framework-neutral transcoding crate spanning the runtime,
the serving adapters, and the build-time code generator:
- transcoding / handling: decode an HTTP request into a protobuf message,
  dispatch it to the gRPC handler, and encode the reply as JSON, mapping
  Code / Status to HTTP status codes.
- serving (default, feature-gated): one-shot serve_http* helpers plus
  RestService / StreamingRestService adapters for the tower and
  layered ecosystems (hyper, axum, …). Request bodies are buffered with an
  optional with_max_body_bytes cap (413 Payload Too Large on overflow),
  and read failures surface as 400 Bad Request rather than an empty body.
- streaming: server-streaming responses forwarded frame by frame as a JSON
  array, NDJSON, or SSE.
- build / build-openapi: a build.rs code generator that turns
  google.api.http-annotated gRPC services (read from compiled descriptors)
  into a static REST router, service traits, a dispatcher, an optional tonic
  bridge, and an optional OpenAPI 3.1 specification.
rest_over_grpc_examples: worked examples organized by architecture layer,
covering both the generated tonic bridge and a hand-written service that
implements the generated trait directly.
rest_over_grpc_tests: end-to-end tests and benchmarks for the generated
router and dispatcher.

Copilot

Pull request overview

This PR introduces a build-time generated REST/JSON façade for existing gRPC services driven by google.api.http annotations, adding a small path-template parser crate, a runtime transcoding layer, a build-time generator, and accompanying examples/benchmarks.

Changes:

Add http_path_template (path-template parser), rest_over_grpc (runtime transcoder/adapters), and rest_over_grpc_build (code generator).
Add worked examples (tonic bridge + custom/prost handler) and integration tests for value types, adapters, streaming, and OpenAPI output.
Add benchmark + correctness harness for the generated router/dispatcher and supporting workspace wiring (deps, spelling, clippy idents).

Reviewed changes

Copilot reviewed 107 out of 108 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
README.md	Adds new primary-crate entries for REST-over-gRPC components.
CHANGELOG.md	Links new crate changelogs from the workspace changelog index.
Cargo.toml	Adds workspace dependencies for new crates and supporting libs (prost/tonic/etc.).
clippy.toml	Allows additional doc-valid identifiers (e.g., “OpenAPI”).
.spelling	Adds domain-specific terms used by the new crates/docs.
crates/http_path_template/Cargo.toml	Defines the new `http_path_template` crate metadata.
crates/http_path_template/CHANGELOG.md	Introduces the crate changelog for initial release.
crates/http_path_template/README.md	Adds crate README content and examples.
crates/http_path_template/favicon.ico	Adds crate branding asset (Git LFS).
crates/http_path_template/logo.png	Adds crate branding asset (Git LFS).
crates/http_path_template/src/lib.rs	Exposes the parser API and crate-level docs.
crates/http_path_template/src/error.rs	Defines `ParseError` and predicates for parse failures.
crates/http_path_template/src/segment.rs	Defines the parsed `Segment` AST.
crates/http_path_template/src/variable.rs	Defines `{field.path=subtemplate}` variable representation.
crates/rest_over_grpc/Cargo.toml	Defines the new `rest_over_grpc` runtime crate and feature flags.
crates/rest_over_grpc/CHANGELOG.md	Introduces the crate changelog for initial release.
crates/rest_over_grpc/favicon.ico	Adds crate branding asset (Git LFS).
crates/rest_over_grpc/logo.png	Adds crate branding asset (Git LFS).
crates/rest_over_grpc/examples/layered_service.rs	Example: serve transcoded REST via `layered`.
crates/rest_over_grpc/examples/tower_service.rs	Example: serve transcoded REST via `tower`.
crates/rest_over_grpc/examples/transcode_http_handler.rs	Example: call `transcode_http` directly without a `Service`.
crates/rest_over_grpc/src/axum_support.rs	`axum` integration (`IntoResponse`) for neutral response types.
crates/rest_over_grpc/src/binding.rs	Adds `Binding` type for captured path-variable bindings.
crates/rest_over_grpc/src/route_match.rs	Adds `RouteMatch` type with inline binding storage optimization.
crates/rest_over_grpc/src/status.rs	Adds neutral `Status` type with JSON-details support.
crates/rest_over_grpc/src/transcode/error.rs	Adds `TranscodeError` and status mapping for transcoding failures.
crates/rest_over_grpc/src/transcode/field_deserializer.rs	Adds internal deserializer used for body-field decoding.
crates/rest_over_grpc/src/transcode/percent.rs	Adds minimal percent-decoding helpers for path/query bindings.
crates/rest_over_grpc/src/transcode/request_body_kind.rs	Adds `RequestBodyKind` describing request-body mapping at runtime.
crates/rest_over_grpc/src/transcode/response_body_kind.rs	Adds `ResponseBodyKind` describing response-body mapping at runtime.
crates/rest_over_grpc/tests/adapter.rs	Integration tests for `tower`/`layered` HTTP adapters.
crates/rest_over_grpc/tests/axum_support.rs	Integration tests for `axum` `IntoResponse` integration.
crates/rest_over_grpc/tests/streaming_adapter.rs	Integration tests for streaming HTTP adapter and service wrapper.
crates/rest_over_grpc/tests/value_types.rs	Integration tests for always-available value types (`Code`, `Status`, `HttpResponse`).
crates/rest_over_grpc_build/Cargo.toml	Defines the new `rest_over_grpc_build` codegen crate and features.
crates/rest_over_grpc_build/CHANGELOG.md	Introduces the crate changelog for initial release.
crates/rest_over_grpc_build/favicon.ico	Adds crate branding asset (Git LFS).
crates/rest_over_grpc_build/logo.png	Adds crate branding asset (Git LFS).
crates/rest_over_grpc_build/examples/generate_service.rs	Example: generate service code from hand-built `HttpRule`s.
crates/rest_over_grpc_build/src/binding.rs	Models additional HTTP bindings and lowers them into routes.
crates/rest_over_grpc_build/src/descriptor_error.rs	Adds descriptor decoding error type with predicates and Display.
crates/rest_over_grpc_build/src/descriptor_options.rs	Adds options for decoding services/types from descriptor sets.
crates/rest_over_grpc_build/src/generator_builder.rs	Adds builder for configuring generator options (Send bounds, tonic bridge, OpenAPI).
crates/rest_over_grpc_build/src/generator_output.rs	Defines per-service generated output container.
crates/rest_over_grpc_build/src/http_method.rs	Defines `HttpMethod` mapping and tokens for routing/codegen.
crates/rest_over_grpc_build/src/http_rule.rs	Defines `HttpRule` model and lowering into `Route`s.
crates/rest_over_grpc_build/src/proto/google/api/annotations.proto	Vendors google API annotations proto schema for consumers.
crates/rest_over_grpc_build/src/proto/google/api/http.proto	Vendors google API http proto schema for consumers.
crates/rest_over_grpc_build/src/request_body.rs	Models `HttpRule.body` as `RequestBody` with Display.
crates/rest_over_grpc_build/src/response_body.rs	Models `HttpRule.response_body` as `ResponseBody` with Display.
crates/rest_over_grpc_build/src/route.rs	Models lowered HTTP route components for router/dispatcher codegen.
crates/rest_over_grpc_build/src/service_method.rs	Models a service method and its lowered routes for codegen.
crates/rest_over_grpc_bench/Cargo.toml	Adds benchmarking/correctness crate for router/dispatcher behavior.
crates/rest_over_grpc_bench/bench_routes.rs	Provides shared large route table for generated router + matchit comparison.
crates/rest_over_grpc_bench/benches/rog_dispatch_cg.rs	Callgrind benchmark for end-to-end generated dispatcher.
crates/rest_over_grpc_bench/benches/rog_router_cg.rs	Callgrind benchmark for generated router vs `matchit`.
crates/rest_over_grpc_bench/build.rs	Generates routers from route tables at build time into `OUT_DIR`.
crates/rest_over_grpc_bench/src/lib.rs	Includes generated routers and exposes `resolve` functions for tests/benches.
crates/rest_over_grpc_bench/tests/bench_router.rs	Smoke tests verifying benchmark router resolves representative routes.
crates/rest_over_grpc_bench/tests/coverage.rs	Routing correctness tests for tricky matching/backtracking cases.
crates/rest_over_grpc_custom_example/Cargo.toml	Defines the custom/prost handler example crate (OpenAPI enabled).
crates/rest_over_grpc_custom_example/build.rs	Builds prost+pbjson types and generates REST trait/dispatcher + OpenAPI.
crates/rest_over_grpc_custom_example/examples/client_streaming_upload.rs	Example: compose non-transcoded streaming upload with transcoded JSON routes.
crates/rest_over_grpc_custom_example/examples/custom_body_handling.rs	Example: custom body policy (caps/415/413) around generated dispatch.
crates/rest_over_grpc_custom_example/proto/google/api/annotations.proto	Vendors google API annotations schema for the example.
crates/rest_over_grpc_custom_example/proto/google/api/http.proto	Vendors google API http schema for the example.
crates/rest_over_grpc_custom_example/proto/library.proto	Example proto annotated with `google.api.http` rules.
crates/rest_over_grpc_custom_example/src/lib.rs	Implements generated REST service trait directly (no tonic bridge).
crates/rest_over_grpc_custom_example/tests/adapter.rs	End-to-end tests driving generated dispatcher via HTTP adapter.
crates/rest_over_grpc_custom_example/tests/e2e.rs	End-to-end transcoding tests (path/query/body, headers, details).
crates/rest_over_grpc_custom_example/tests/openapi.rs	Validates generated OpenAPI 3.1 document content/structure.
crates/rest_over_grpc_example/Cargo.toml	Defines the tonic-bridge example crate and build deps.
crates/rest_over_grpc_example/build.rs	Generates tonic messages/server trait, pbjson serde, and REST bridge/dispatch.
crates/rest_over_grpc_example/examples/basic_dispatch.rs	Example: call generated `dispatch` directly.
crates/rest_over_grpc_example/examples/custom_fallback.rs	Example: `try_dispatch` for custom routing fallback behavior.
crates/rest_over_grpc_example/examples/streaming_response.rs	Example: end-to-end streaming to wire via `dispatch_streaming`.
crates/rest_over_grpc_example/examples/tower_service.rs	Example: serve tonic-bridged dispatcher through `RestService` (`tower`).
crates/rest_over_grpc_example/proto/google/api/annotations.proto	Vendors google API annotations schema for the example.
crates/rest_over_grpc_example/proto/google/api/http.proto	Vendors google API http schema for the example.
crates/rest_over_grpc_example/proto/greeter.proto	Example proto (unary + server-streaming) annotated for REST transcoding.
crates/rest_over_grpc_example/src/lib.rs	Implements tonic server trait and re-exports generated dispatcher.
crates/rest_over_grpc_example/tests/bridge.rs	End-to-end tests verifying the tonic bridge dispatches and maps statuses.

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github-actions · 2026-07-05T17:10:53Z

⚠️ Breaking Changes Detected

error: failed to retrieve local crate data from git revision

Caused by:
    0: failed to retrieve manifest file from git revision source
    1: possibly due to errors: [
         failed when reading /home/runner/work/oxidizer/oxidizer/target/semver-checks/git-origin_main/0f4bc2e85123fae041952c44976c56dbba3e69bc/scripts/crate-template/Cargo.toml: TOML parse error at line 9, column 26
         |
       9 | keywords = ["oxidizer", {{CRATE_KEYWORDS}}]
         |                          ^
       missing key for inline table element, expected key
       : TOML parse error at line 9, column 26
         |
       9 | keywords = ["oxidizer", {{CRATE_KEYWORDS}}]
         |                          ^
       missing key for inline table element, expected key
       ,
         failed to parse /home/runner/work/oxidizer/oxidizer/target/semver-checks/git-origin_main/0f4bc2e85123fae041952c44976c56dbba3e69bc/Cargo.toml: no `package` table,
       ]
    2: package `http_path_template` not found in /home/runner/work/oxidizer/oxidizer/target/semver-checks/git-origin_main/0f4bc2e85123fae041952c44976c56dbba3e69bc

Stack backtrace:
   0: anyhow::error::<impl anyhow::Error>::msg
   1: cargo_semver_checks::rustdoc_gen::RustdocFromProjectRoot::get_crate_source
   2: cargo_semver_checks::rustdoc_gen::StatefulRustdocGenerator<cargo_semver_checks::rustdoc_gen::CoupledState>::prepare_generator
   3: cargo_semver_checks::Check::check_release::{{closure}}
   4: cargo_semver_checks::Check::check_release
   5: cargo_semver_checks::exit_on_error
   6: cargo_semver_checks::main
   7: std::sys::backtrace::__rust_begin_short_backtrace
   8: main

If the breaking changes are intentional then everything is fine - this message is merely informative.

Remember to apply a version number bump with the correct severity when publishing a version with breaking changes (1.x.x -> 2.x.x or 0.1.x -> 0.2.x).

codecov · 2026-07-05T17:16:01Z

Codecov Report

❌ Patch coverage is 99.94333% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.7%. Comparing base (5fd5568) to head (f8e31b6).

Files with missing lines	Patch %	Lines
crates/http_path_template/src/grammar.rs	70.0%	3 Missing ⚠️

❌ Your project check has failed because the head coverage (99.7%) is below the target coverage (100.0%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #546     +/-   ##
========================================
- Coverage   100.0%   99.7%   -0.3%     
========================================
  Files         356     401     +45     
  Lines       27388   34141   +6753     
========================================
+ Hits        27388   34065   +6677     
- Misses          0      76     +76

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sandersaares · 2026-07-10T12:47:43Z

+/// );
+/// ```
+#[derive(Debug)]
+pub struct ParseError {


Why not ohno? This appears to be hand-rolling part of ohno functionality for no obvious reason. We have an error library, let's use it.

sandersaares · 2026-07-10T13:24:43Z

+
+//! Generating a REST service from `google.api.http` rules.
+//!
+//! Builds [`HttpRule`]s (normally read straight from proto annotations by


I am confused by this example. Why is it saying how things are done "normally"? Is this an "abnormal" example? To an uninformed reader the context of this example is hard to identity: "generating a REST service from 'google.api.http' rules" feels like a "normal" thing to do but this statement suggests to me I am doing it "abnormally" somehow. More clarity on what is special in this example would be desirable.

sandersaares · 2026-07-10T13:30:07Z

+    // Render the generated Rust for display; a build script would instead
+    // write the code to files under `OUT_DIR` with `Generator::write`.
+    for service in generated {
+        let mut code = service.r#trait().clone();


Having to write r#trait() suggests some rather suboptimal naming. Might be better to avoid reserved keywords in public APIs.

sandersaares · 2026-07-10T13:39:41Z

+
+//! Serving REST/JSON through the `layered` adapter.
+//!
+//! The repository's `layered::Service` is an `async fn`-with-`&self` alternative


"The repository's" is cumbersome wording. Let's speak of the layered package, not of "the repository" - packages can move between repositories and readers might not always have context to understand what "the repository" refers to.

sandersaares · 2026-07-10T13:45:51Z

+
+#[tokio::main(flavor = "current_thread")]
+async fn main() {
+    // `layered::Service` needs no `Clone` and takes `&self`, so the service is


Unclear what the impact of this comment is. Why are we document things that are not? Same for the comment a few lines below.

It almost sounds as if this was made as a "comparison" but no comparand is in sight.

ralfbiedert · 2026-07-10T13:58:09Z

+//!     // request and encoding the reply. Returns a `TranscodeResponse` (a buffered
+//!     // unary reply or a server-streaming frame stream); `None` when no route
+//!     // matches.
+//!     async fn try_transcode(&self, method: &str, target: &str,


I'm not sure about the stringiness here (over URI parts or similar), but maybe that comes from having to be compatible with a range of crates?

Correct, this is the only lingua franca there is at this level of the stack.

ralfbiedert · 2026-07-10T14:00:32Z

+//!   composed alongside the transcoded JSON routes. See
+//!   `rest_over_grpc_examples`'s `examples/handling/client_streaming_upload.rs`.
+//!
+//! - **The request body is buffered as one JSON `&[u8]`.** The generated


Nit, it's not the &[u8] that does buffering, but rather what it's exposed as?

ralfbiedert · 2026-07-10T14:02:40Z

+// Licensed under the MIT License.
+
+//! The serving layer: bridges the `http` / `http-body` ecosystem to the neutral
+//! transcoder signature. Gated on the `serving` feature (on by default, and


This is what the docrs attributes are for, this shouldn't be documented as text.

ralfbiedert · 2026-07-10T14:11:00Z

@@ -0,0 +1,84 @@
+// Copyright 2024 Google LLC


Is the idea that every user has to place exactly these files besides their project for the main annotations to work?

ralfbiedert · 2026-07-10T14:25:54Z

@@ -0,0 +1,124 @@
+// Copyright (c) Microsoft Corporation.


I'm not very fond of most examples. There is a lot going on in both the library and the examples, and it's hard to know where to even start looking, everything is sort of related to everything else somehow, concept wise. Basic transcode is small enough to start wrapping my head around things, but even then I have to dive into LibraryServce, the generated "/tonic_bridge/library.rs" ...

Like is there a way to have basic examples of fundamental concepts only, say, 1/3 as large?

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Expose an existing gRPC API as a traditional REST/JSON API in the same process, driven by `google.api.http` annotations. The gRPC service is implemented once; the REST layer is generated at build time and transcodes requests and responses with minimal runtime overhead. The generated router is built on a standalone, zero-allocation static router (`routerama`) that is also useful on its own. Crates added: - `routerama`: dependency-free runtime for a compile-time static HTTP router — zero-allocation method + path matching returning the matched tag and captured path variables (with a SIMD segment scanner). - `routerama_macros`: the `routes!` procedural macro that generates a static router inline from a named route enum, with no `build.rs` required. - `routerama_build`: build-time code generator that lowers a route set into a `resolve` function (a nested `match` over path segments — a compile-time trie), reporting genuinely ambiguous routes as a `compile_error!`. - `http_path_template`: dependency-free parser for the `google.api.http` path-template grammar (literals, `*`, `**`, `{field=sub}` variables, `:verb`), with an optional extended grammar for intra-segment prefix/suffix parameters. - `rest_over_grpc`: framework-neutral transcoding crate spanning the runtime, the serving adapters, and the build-time code generator: - `transcoding` / `handling`: decode an HTTP request into a protobuf message, dispatch it to the gRPC handler, and encode the reply as JSON, mapping `Code` / `Status` to HTTP status codes. - `serving` (default, feature-gated): one-shot `serve_http*` helpers plus a `RestService` adapter for the `tower` and `layered` ecosystems (hyper, axum, …), serving both unary and server-streaming RPCs through one response type. Request bodies are buffered with an optional `with_max_body_bytes` cap (`413 Payload Too Large` on overflow), and read failures surface as `400 Bad Request` rather than an empty body. - Server-streaming responses are forwarded frame by frame as a JSON array, NDJSON, or SSE (negotiated from `Accept`); a unary reply is buffered, both through the same serving path. - `build` / `build-openapi`: a `build.rs` code generator that turns `google.api.http`-annotated gRPC services (read from compiled descriptors) into a static REST router, service traits, a dispatcher, an optional `tonic` bridge, and an optional OpenAPI 3.1 specification. - `rest_over_grpc_examples`: worked examples organized by architecture layer, covering both the generated `tonic` bridge and a hand-written service that implements the generated trait directly. - `rest_over_grpc_tests`: end-to-end tests and benchmarks for the generated router and dispatcher. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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geeknoid force-pushed the rest_over_grpc branch from 35518a5 to 94ac180 Compare July 9, 2026 10:41

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geeknoid force-pushed the rest_over_grpc branch from 94ac180 to efaa2b5 Compare July 9, 2026 10:42

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Comment thread crates/rest_over_grpc/src/lib.rs

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geeknoid commented Jul 5, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Pull request overview

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github-actions Bot commented Jul 5, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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⚠️ Breaking Changes Detected

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ralfbiedert Jul 10, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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geeknoid commented Jul 5, 2026 •

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