ci: build Rust bindings inside devcontainer

Add Rust toolchain (rustup, clippy, rustfmt, gcc, musl-dev) to the
devcontainer Dockerfile. Rust builds alongside Go and Python as part
of proto-local. Pass PROTO_DEPS_DIR to cargo so build.rs finds
validate.proto from the container's proto deps.

local build still fetches validate.proto from net

Signed-off-by: Mikhail Malyshev <mike.malyshev@gmail.com>

Author: rucoder

.devcontainer/Dockerfile

@@ -12,7 +12,7 @@ ARG PROTO_GEN_VALIDATE_VERSION=7b06248484ceeaa947e93ca2747eccf336a88ecc # v1.2.1
 ARG GOOGLEAPIS_VERSION=376467058c288ad34dd7aafa892a95883e4acd0c # master
 ARG PROTO_DEPS_DIR=/proto/.proto_deps
 
-RUN apk add --no-cache bash curl git make graphviz ttf-freefont
+RUN apk add --no-cache bash curl git make graphviz ttf-freefont gcc musl-dev
 
 
 RUN arch="$(uname -m)" && \
@@ -70,3 +70,7 @@ RUN mkdir -p $(go env GOPATH)
 RUN go install google.golang.org/protobuf/cmd/protoc-gen-go@v${PROTOC_GEN_GO_VERSION} && mv /root/go/bin/protoc-gen-go /usr/local/bin/protoc-gen-go
 RUN go install github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2@${OPENAPI_VERSION} && mv /root/go/bin/protoc-gen-openapiv2 /usr/local/bin/protoc-gen-openapiv2
 RUN go install github.com/envoyproxy/protoc-gen-validate@${PROTO_GEN_VALIDATE_VERSION} && mv /root/go/bin/protoc-gen-validate /usr/local/bin/protoc-gen-validate
+
+# Install Rust toolchain (for prost-build based protobuf bindings)
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable --profile minimal --component clippy,rustfmt
+ENV PATH="/root/.cargo/bin:${PATH}"

.gitignore

@@ -1,3 +1,4 @@
 .cache/
 swagger/
 rust/target/
+rust/proto-deps/

Makefile

@@ -46,19 +46,17 @@ go-vet:
 python: proto-api-python
 
 rust:
-	cd rust && cargo build --release
+	cd rust && PROTO_DEPS_DIR=$(PROTO_DEPS_DIR) cargo build --release
 	@echo Rust bindings built successfully
 
 rust-test:
-	cd rust && cargo test
-	cd rust && cargo test --examples
+	cd rust && PROTO_DEPS_DIR=$(PROTO_DEPS_DIR) cargo test
 
 rust-clean:
 	cd rust && cargo clean
 
 rust-check:
-	cd rust && cargo check
-	cd rust && cargo clippy -- -D warnings
+	cd rust && PROTO_DEPS_DIR=$(PROTO_DEPS_DIR) cargo clippy -- -D warnings
 	cd rust && cargo fmt --check
 
 proto-api-%:

rust/build.rs

@@ -1,5 +1,6 @@
 use prost_build::Config;
 use std::path::Path;
+use std::process::Command;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let proto_dir = Path::new(env!("CARGO_MANIFEST_DIR")).join("../proto");
@@ -14,6 +15,37 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     let proto_dir_str = proto_dir.to_str().unwrap();
 
+    // Extra include path for third-party proto deps (e.g., validate/validate.proto
+    // from protoc-gen-validate, imported by register.proto).
+    //
+    // Resolution order:
+    // 1. PROTO_DEPS_DIR env var (set inside devcontainer → /proto/.proto_deps)
+    // 2. Local proto-deps/ directory (auto-fetched for local dev)
+    let proto_deps_dir = if let Ok(d) = std::env::var("PROTO_DEPS_DIR") {
+        Path::new(&d).join("protoc-gen-validate").to_path_buf()
+    } else {
+        let local = Path::new(env!("CARGO_MANIFEST_DIR")).join("proto-deps");
+        let validate = local.join("validate").join("validate.proto");
+        if !validate.exists() {
+            eprintln!("Fetching validate.proto for local build...");
+            std::fs::create_dir_all(local.join("validate")).expect("create proto-deps/validate/");
+            let status = Command::new("curl")
+                .args([
+                    "-sSfL",
+                    "-o",
+                    validate.to_str().unwrap(),
+                    "https://raw.githubusercontent.com/bufbuild/protoc-gen-validate/v1.2.1/validate/validate.proto",
+                ])
+                .status()
+                .expect("failed to run curl — install curl or use the devcontainer");
+            if !status.success() {
+                panic!("failed to download validate.proto (exit {})", status);
+            }
+        }
+        local
+    };
+    let proto_deps_str = proto_deps_dir.to_str().unwrap().to_owned();
+
     let mut config = Config::new();
 
     // Use Bytes for all bytes fields for zero-copy efficiency
@@ -91,10 +123,12 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     .map(|f| format!("{}/{}", proto_dir_str, f))
     .collect();
 
-    config.compile_protos(&proto_files, &[proto_dir_str])?;
+    config.compile_protos(&proto_files, &[proto_dir_str, &proto_deps_str])?;
 
     // Rerun if any proto file changes
     println!("cargo:rerun-if-changed={}", proto_dir_str);
+    println!("cargo:rerun-if-changed={}", proto_deps_str);
+    println!("cargo:rerun-if-env-changed=PROTO_DEPS_DIR");
     println!("cargo:rerun-if-changed=build.rs");
 
     Ok(())