chore: remove unused dependencies and rename Prost generator

.github/workflows/bvt.yml

@@ -23,7 +23,7 @@ jobs:
         run: |
           cargo test --workspace --features async,sync,security_extension
           cargo test -p ttrpc --no-default-features --features sync,async,prost
-          cargo test --manifest-path codegen/Cargo.toml
+          cargo test --manifest-path ttrpc-codegen-prost/Cargo.toml
 
   check:
     name: Check
@@ -40,9 +40,9 @@ jobs:
       - name: Check
         run: |
           make check-all
-          # The codegen crate is a standalone workspace root, so its checks
+          # The ttrpc-codegen-prost crate is a standalone workspace root, so its checks
           # must be invoked explicitly (protoc is required for its tests).
-          make -C codegen check
+          make -C ttrpc-codegen-prost check
 
   make:
     name: Build
@@ -63,7 +63,7 @@ jobs:
           make -C ttrpc-codegen
           make -C example build-examples
           make -C example-prost build-examples
-          make -C codegen test
+          make -C ttrpc-codegen-prost test
         # Keep bash so a native-command failure on Windows isn't masked by a
         # later successful command (PowerShell swallows non-zero exits).
         shell: bash

Cargo.toml

@@ -9,7 +9,7 @@ members = [
 # they are standalone crates and intentionally kept decoupled from the
 # rustprotobuf-oriented workspace members above.
 exclude = [
-    "./codegen",
+    "./ttrpc-codegen-prost",
     "./example-prost",
 ]
 resolver = "2"
@@ -29,8 +29,8 @@ authors = ["The AntFin Kata Team <kata@list.alibaba-inc.com>"]
 # version. For example, for protobuf:
 #   protobuf = { workspace = true }
 ttrpc = { version = "0.9.0", path = "./" }
-ttrpc-codegen = { version = "0.6.0", path = "./ttrpc-codegen" }
-ttrpc-compiler = { version = "0.8.0", path = "./compiler" }
+ttrpc-codegen = { version = "0.6.1", path = "./ttrpc-codegen" }
+ttrpc-compiler = { version = "0.9.0", path = "./compiler" }
 protobuf = "3.7.2"
 protobuf-codegen = "3.7.2"
 protobuf-parse = "3.7.2"

README.md

@@ -189,18 +189,18 @@ prost = "0.13"
 ttrpc = { path = "../ttrpc-rust", default-features = false, features = ["sync", "prost"] }
 
 [build-dependencies]
-ttrpc-codegen = { path = "../ttrpc-rust/codegen" }
+ttrpc-codegen-prost = { version = "0.1", path = "../ttrpc-rust/ttrpc-codegen-prost" }
 ```
 
-Adjust the paths to your checkout. The Prost generator in `codegen/` is a separate
-crate from the rust-protobuf generator in `ttrpc-codegen/`; select the appropriate
-path. The two protobuf backend features are mutually exclusive. Because disabling
+Adjust the paths to your checkout. The `ttrpc-codegen-prost` package is separate
+from the rust-protobuf `ttrpc-codegen` package; its first release is planned as
+version 0.1. The two protobuf backend features are mutually exclusive. Because disabling
 default features also disables `sync`, list the runtime features explicitly.
 
 Use `.prost()` in `build.rs`. Set `Customize::async_all = true` for async bindings
 and enable the runtime's `async` feature; generated async bindings also require
 `async-trait` in your application. Streaming requires async bindings. The
-[Prost generator guide](./codegen/README.md) includes a complete dependency setup,
+[Prost generator guide](./ttrpc-codegen-prost/README.md) includes a complete dependency setup,
 service definition, build script, and generated-module import.
 
 Generated Rust files and modules follow the protobuf package rather than the
@@ -230,7 +230,7 @@ you inspect the Prost APIs and fails on documentation warnings. The generator's
 own documentation is built separately:
 
 ```bash
-RUSTDOCFLAGS="-D warnings" cargo doc --manifest-path codegen/Cargo.toml --no-deps --open
+RUSTDOCFLAGS="-D warnings" cargo doc --manifest-path ttrpc-codegen-prost/Cargo.toml --no-deps --open
 ```
 
 ## Transport addresses
@@ -253,7 +253,7 @@ ttrpc does not provide TLS. If you expose TCP beyond a trusted boundary, secure
 | [`ttrpc-codegen`](https://crates.io/crates/ttrpc-codegen) | Build-script API for parsing `.proto` files and generating Rust code |
 | [`ttrpc-compiler`](https://crates.io/crates/ttrpc-compiler) | Service code generator and `protoc` plugin |
 | [`example`](https://github.com/containerd/ttrpc-rust/tree/master/example) | End-to-end unary and streaming examples using rust-protobuf |
-| [Prost generator](./codegen) | Standalone build-script generator using Prost and `protoc` |
+| [`ttrpc-codegen-prost`](./ttrpc-codegen-prost) | Standalone build-script generator using Prost and `protoc` |
 | [`example-prost`](./example-prost) | Standalone unary and streaming examples using Prost |
 
 ## Compatibility
@@ -276,8 +276,8 @@ make test
 make check-all
 
 # The Prost generator is a separate workspace
-make -C codegen test
-make -C codegen check
+make -C ttrpc-codegen-prost test
+make -C ttrpc-codegen-prost check
 ```
 
 ## Project details

RELEASE.md

@@ -10,10 +10,12 @@ This document describes the steps to release a new version of the crate or wasi-
    * `./CHANGELOG.md` for `ttrpc`.
    * `./compiler/CHANGELOG.md` for `ttrpc-compiler`.
    * `./ttrpc-codegen/CHANGELOG.md` for `ttrpc-codegen`.
+   * `./ttrpc-codegen-prost/CHANGELOG.md` for `ttrpc-codegen-prost`.
 2. Bump package and dependency versions in:
    * `./compiler/Cargo.toml`: Bump the package version as needed.
    * `./ttrpc-codegen/Cargo.toml`: Bump the package version as needed.
    * `./Cargo.toml`: Bump package version as needed. Then bump the workspace dependencies version to match the respective crates versions.
+   * `./ttrpc-codegen-prost/Cargo.toml`: Bump `ttrpc-codegen-prost` as needed and update its dependency version in `./example-prost/Cargo.toml`.
 3. Commit the changes and get them merged in the repo.
 4. Dry run the `cargo publish` command as follows:
    ```bash
@@ -30,3 +32,20 @@ This document describes the steps to release a new version of the crate or wasi-
    1. `ttrpc-compiler`
    2. `ttrpc-codegen`
    3. `ttrpc`
+
+### Standalone Prost Generator
+
+`ttrpc-codegen-prost` lives in `ttrpc-codegen-prost/` and is a separate workspace. It is
+not included in the root workspace publish commands above. Validate and
+publish it separately when selected for release:
+
+```bash
+cargo test --manifest-path ttrpc-codegen-prost/Cargo.toml
+cargo build --manifest-path example-prost/Cargo.toml --examples
+cargo publish --manifest-path ttrpc-codegen-prost/Cargo.toml --dry-run --locked
+# After the dry run succeeds and the release changes are merged:
+cargo publish --manifest-path ttrpc-codegen-prost/Cargo.toml --locked
+```
+
+Keep its package version and release notes independent from the
+rust-protobuf `ttrpc-codegen` package.

compiler/CHANGELOG.md

@@ -9,6 +9,14 @@ published crates and Git history. Release dates are crates.io publication
 dates. Releases are ordered by publication date because multiple version
 lines were maintained in parallel.
 
+## [Unreleased]
+
+### Removed
+
+- **Breaking:** Removed the unused `prost_codegen` module, which generated
+  grpcio bindings, and its Prost 0.8 dependencies. Use the standalone Prost
+  generator in `ttrpc-codegen-prost/` for ttrpc bindings.
+
 ## [0.8.0] - 2025-07-15
 
 ### API changes

compiler/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ttrpc-compiler"
-version = "0.8.0"
+version = "0.9.0"
 edition = { workspace = true }
 rust-version = { workspace = true }
 license = { workspace = true }
@@ -15,10 +15,8 @@ homepage = "https://github.com/containerd/ttrpc-rust/tree/master/compiler"
 [dependencies]
 protobuf = { workspace = true }
 protobuf-codegen = { workspace = true }
-prost = "0.8"
-prost-build = "0.8"
-prost-types = "0.8"
-derive-new = "0.5"
+
+[dev-dependencies]
 tempfile = "3.0"
 
 [[bin]]

compiler/src/lib.rs

@@ -25,8 +25,6 @@
 
 /// Generates ttrpc service bindings from Protocol Buffers descriptors.
 pub mod codegen;
-/// Legacy Prost-based code generation helpers.
-pub mod prost_codegen;
 mod util;
 
 /// Customize generated code.