feat(grpc): Add protobuf codegen

.github/workflows/CI.yml

@@ -33,6 +33,25 @@ jobs:
       with:
         components: clippy
     - uses: taiki-e/install-action@protoc
+    - name: Install Bazel
+      uses: bazel-contrib/[email protected]
+      with:
+        # Avoid downloading Bazel every time.
+        bazelisk-cache: true
+        # Store build cache per workflow.
+        disk-cache: ${{ github.workflow }}
+        # Share repository cache between workflows.
+        repository-cache: true
+        module-root: ./compiler
+    - name: Build and protoc plugin and add to PATH
+      id: build_step
+      # This runs all commands within the compiler/ directory
+      working-directory: ./compiler
+      run: |
+        bazel build //src:protoc-gen-rust-grpc
+
+        # Add the output directory to the GitHub PATH for subsequent steps
+        echo "$(pwd)/bazel-bin/src" >> $GITHUB_PATH
     - uses: Swatinem/rust-cache@v2
     - run: cargo clippy --workspace --all-features --all-targets
 
@@ -55,6 +74,25 @@ jobs:
     - uses: taiki-e/install-action@cargo-hack
     - uses: taiki-e/install-action@cargo-udeps
     - uses: taiki-e/install-action@protoc
+    - name: Install Bazel
+      uses: bazel-contrib/[email protected]
+      with:
+        # Avoid downloading Bazel every time.
+        bazelisk-cache: true
+        # Store build cache per workflow.
+        disk-cache: ${{ github.workflow }}
+        # Share repository cache between workflows.
+        repository-cache: true
+        module-root: ./compiler
+    - name: Build and protoc plugin and add to PATH
+      id: build_step
+      # This runs all commands within the compiler/ directory
+      working-directory: ./compiler
+      run: |
+        bazel build //src:protoc-gen-rust-grpc
+
+        # Add the output directory to the GitHub PATH for subsequent steps
+        echo "$(pwd)/bazel-bin/src" >> $GITHUB_PATH
     - uses: Swatinem/rust-cache@v2
     - run: cargo hack udeps --workspace --exclude-features=_tls-any,tls,tls-aws-lc,tls-ring --each-feature
     - run: cargo udeps --package tonic --features tls-ring,transport
@@ -76,6 +114,25 @@ jobs:
     - uses: hecrj/setup-rust-action@v2
     - uses: taiki-e/install-action@cargo-hack
     - uses: taiki-e/install-action@protoc
+    - name: Install Bazel
+      uses: bazel-contrib/[email protected]
+      with:
+        # Avoid downloading Bazel every time.
+        bazelisk-cache: true
+        # Store build cache per workflow.
+        disk-cache: ${{ github.workflow }}
+        # Share repository cache between workflows.
+        repository-cache: true
+        module-root: ./compiler
+    - name: Build and protoc plugin and add to PATH
+      id: build_step
+      # This runs all commands within the compiler/ directory
+      working-directory: ./compiler
+      run: |
+        bazel build //src:protoc-gen-rust-grpc
+
+        # Add the output directory to the GitHub PATH for subsequent steps
+        echo "$(pwd)/bazel-bin/src" >> $GITHUB_PATH
     - uses: Swatinem/rust-cache@v2
     - name: Check features
       run: cargo hack check --workspace --no-private --each-feature --no-dev-deps
@@ -115,6 +172,25 @@ jobs:
     - uses: actions/checkout@v4
     - uses: hecrj/setup-rust-action@v2
     - uses: taiki-e/install-action@protoc
+    - name: Install Bazel
+      uses: bazel-contrib/[email protected]
+      with:
+        # Avoid downloading Bazel every time.
+        bazelisk-cache: true
+        # Store build cache per workflow.
+        disk-cache: ${{ github.workflow }}
+        # Share repository cache between workflows.
+        repository-cache: true
+        module-root: ./compiler
+    - name: Build and protoc plugin and add to PATH
+      id: build_step
+      # This runs all commands within the compiler/ directory
+      working-directory: ./compiler
+      run: |
+        bazel build //src:protoc-gen-rust-grpc
+
+        # Add the output directory to the GitHub PATH for subsequent steps
+        echo "$(pwd)/bazel-bin/src" >> $GITHUB_PATH
     - uses: taiki-e/install-action@cargo-hack
     - uses: taiki-e/install-action@cargo-nextest
     - uses: Swatinem/rust-cache@v2
@@ -141,6 +217,25 @@ jobs:
     - uses: actions/checkout@v4
     - uses: hecrj/setup-rust-action@v2
     - uses: taiki-e/install-action@protoc
+    - name: Install Bazel
+      uses: bazel-contrib/[email protected]
+      with:
+        # Avoid downloading Bazel every time.
+        bazelisk-cache: true
+        # Store build cache per workflow.
+        disk-cache: ${{ github.workflow }}
+        # Share repository cache between workflows.
+        repository-cache: true
+        module-root: ./compiler
+    - name: Build and protoc plugin and add to PATH
+      id: build_step
+      # This runs all commands within the compiler/ directory
+      working-directory: ./compiler
+      run: |
+        bazel build //src:protoc-gen-rust-grpc
+
+        # Add the output directory to the GitHub PATH for subsequent steps
+        echo "$(pwd)/bazel-bin/src" >> $GITHUB_PATH
     - uses: Swatinem/rust-cache@v2
     - name: Run interop tests
       run: ./interop/test.sh

Cargo.toml

@@ -9,6 +9,7 @@ members = [
   "examples",
   "codegen",
   "grpc",
+  "grpc-build",
   "interop", # Tests
   "tests/disable_comments",
   "tests/included_service",

compiler/.gitignore

@@ -0,0 +1,9 @@
+# Bazel
+bazel-bin
+bazel-examples
+bazel-genfiles
+bazel-grpc-java
+bazel-out
+bazel-testlogs
+MODULE.bazel.lock
+

compiler/MODULE.bazel

@@ -0,0 +1,15 @@
+bazel_dep(name = "protobuf", repo_name = "com_google_protobuf", version = "31.1")
+
+# Hedron's Compile Commands Extractor for bazel
+# This is used to generate a compile_commands.json file which can be used by
+# LSP servers like clangd.
+# https://github.com/hedronvision/bazel-compile-commands-extractor
+bazel_dep(name = "hedron_compile_commands", dev_dependency = True)
+git_override(
+    module_name = "hedron_compile_commands",
+    # Using a commit from a fork to workaround failures while using absl.
+    # TODO: replace with a commit on the official repo once the following PR is
+    # merged: https://github.com/hedronvision/bazel-compile-commands-extractor/pull/219
+    remote = "https://github.com/mikael-s-persson/bazel-compile-commands-extractor",
+    commit = "f5fbd4cee671d8d908f37c83abaf70fba5928fc7"
+)

compiler/README.md

@@ -0,0 +1,29 @@
+## Usage example
+```sh
+# Build the plugin with Bazel
+bazel build //src:protoc-gen-rust-grpc
+
+# Set the plugin path
+PLUGIN_PATH="$(pwd)/bazel-bin/src/protoc-gen-rust-grpc"
+
+# Run protoc with the Rust and gRPC plugins
+protoc \
+  --plugin=protoc-gen-grpc-rust="$PLUGIN_PATH" \
+  --rust_opt="experimental-codegen=enabled,kernel=upb" \
+  --rust_out=./tmp \
+  --rust-grpc_opt="experimental-codegen=enabled" \
+  --rust-grpc_out=./tmp \
+  routeguide.proto
+```
+
+## Build
+```sh
+bazel build //src:protoc-gen-rust-grpc
+```
+
+## Language Server Support for development
+Generate compile_commands.json using bazel plugin. Configure the language
+server to use the generate json file.
+```sh
+bazel run @hedron_compile_commands//:refresh_all
+```

compiler/src/BUILD

@@ -0,0 +1,13 @@
+cc_binary(
+    name = "protoc-gen-rust-grpc",
+    srcs = [
+    "grpc_rust_plugin.cc",
+    "grpc_rust_generator.h",
+    "grpc_rust_generator.cc",
+    ],
+    visibility = ["//visibility:public"],
+    deps = [
+        "@com_google_protobuf//:protoc_lib",
+    ],
+)
+