From 61b03f32aead1e7a1070f69a63e7013c7fe0a534 Mon Sep 17 00:00:00 2001
From: Iain McGinniss <309153+iainmcgin@users.noreply.github.com>
Date: Tue, 17 Mar 2026 01:59:52 +0000
Subject: [PATCH] Add connectrpc/rust plugin v0.2.0

connect-rust is a Tower-based Rust implementation of the ConnectRPC
protocol. Generates service traits, typed clients, and monomorphic
dispatchers. Compatible with Connect, gRPC, and gRPC-Web; passes the
full ConnectRPC conformance suite (3600 server tests, 6872 client
tests across protocols).

The plugin emits service stubs only. Message types come from the buffa
plugin (declared as a dep here). Generated stubs reference message
types via absolute paths; the plugin accepts `extern_path=.=<path>` to
configure the root. Left `opts: []` with a comment asking how BSR
injects the dep crate path - same mechanism as tonic/prost presumably,
but want to confirm the exact value.

Note: the protoc-gen-connect-rust binary is a [[bin]] target in the
connectrpc-codegen crate, so the Dockerfile installs connectrpc-codegen
by name and copies the binary out.

Depends on buf.build/community/anthropics-buffa:v0.2.0 (separate PR).

Crates: https://crates.io/crates/connectrpc-codegen
Repo: https://github.com/anthropics/connect-rust
---
 plugins/connectrpc/rust/source.yaml           |  4 ++
 plugins/connectrpc/rust/v0.2.0/.dockerignore  |  2 +
 plugins/connectrpc/rust/v0.2.0/Dockerfile     | 17 ++++++++
 .../connectrpc/rust/v0.2.0/buf.plugin.yaml    | 40 +++++++++++++++++++
 4 files changed, 63 insertions(+)
 create mode 100644 plugins/connectrpc/rust/source.yaml
 create mode 100644 plugins/connectrpc/rust/v0.2.0/.dockerignore
 create mode 100644 plugins/connectrpc/rust/v0.2.0/Dockerfile
 create mode 100644 plugins/connectrpc/rust/v0.2.0/buf.plugin.yaml

diff --git a/plugins/connectrpc/rust/source.yaml b/plugins/connectrpc/rust/source.yaml
new file mode 100644
index 000000000..1c02a0aa6
--- /dev/null
+++ b/plugins/connectrpc/rust/source.yaml
@@ -0,0 +1,4 @@
+source:
+  github:
+    owner: anthropics
+    repository: connect-rust
diff --git a/plugins/connectrpc/rust/v0.2.0/.dockerignore b/plugins/connectrpc/rust/v0.2.0/.dockerignore
new file mode 100644
index 000000000..5d0f124ff
--- /dev/null
+++ b/plugins/connectrpc/rust/v0.2.0/.dockerignore
@@ -0,0 +1,2 @@
+*
+!Dockerfile
diff --git a/plugins/connectrpc/rust/v0.2.0/Dockerfile b/plugins/connectrpc/rust/v0.2.0/Dockerfile
new file mode 100644
index 000000000..e4f063232
--- /dev/null
+++ b/plugins/connectrpc/rust/v0.2.0/Dockerfile
@@ -0,0 +1,17 @@
+# syntax=docker/dockerfile:1.19
+FROM rust:1.91.1-alpine3.22 AS builder
+RUN apk add --no-cache musl-dev
+WORKDIR /app
+ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
+# The protoc-gen-connect-rust binary is a [[bin]] target in the
+# connectrpc-codegen crate. cargo install compiles it by crate name.
+RUN --mount=type=cache,target=/usr/local/cargo/registry,sharing=locked --mount=type=cache,target=/root/target \
+    cargo install connectrpc-codegen --version 0.2.0 --locked --root /app
+
+FROM gcr.io/distroless/static-debian12:latest@sha256:87bce11be0af225e4ca761c40babb06d6d559f5767fbf7dc3c47f0f1a466b92c AS base
+
+FROM scratch
+COPY --link --from=base / /
+COPY --link --from=builder /app/bin/protoc-gen-connect-rust /protoc-gen-connect-rust
+USER nobody
+ENTRYPOINT ["/protoc-gen-connect-rust"]
diff --git a/plugins/connectrpc/rust/v0.2.0/buf.plugin.yaml b/plugins/connectrpc/rust/v0.2.0/buf.plugin.yaml
new file mode 100644
index 000000000..bfe29fea2
--- /dev/null
+++ b/plugins/connectrpc/rust/v0.2.0/buf.plugin.yaml
@@ -0,0 +1,40 @@
+version: v1
+name: buf.build/connectrpc/rust
+plugin_version: v0.2.0
+source_url: https://github.com/anthropics/connect-rust
+description: Generates ConnectRPC service traits, typed clients, and monomorphic dispatchers for Rust. Compatible with the Connect, gRPC, and gRPC-Web protocols. Passes the full ConnectRPC conformance suite.
+deps:
+  - plugin: buf.build/community/anthropics-buffa:v0.2.0
+output_languages:
+  - rust
+spdx_license_id: Apache-2.0
+license_url: https://github.com/anthropics/connect-rust/blob/v0.2.0/LICENSE
+registry:
+  cargo:
+    rust_version: "1.85"
+    deps:
+      # ConnectRPC runtime: Router, Context, ConnectError, client transports.
+      # https://github.com/anthropics/connect-rust/blob/v0.2.0/connectrpc/Cargo.toml
+      - name: "connectrpc"
+        req: "0.2.0"
+        default_features: true
+      # Generated service stubs use buffa::Message, buffa::view::OwnedView,
+      # buffa::bytes::Bytes directly. Message types live in the buffa SDK
+      # crate (via the plugin dep above); this dep is for the runtime API.
+      - name: "buffa"
+        req: "0.2.0"
+        default_features: true
+      # Streaming method signatures use futures::Stream.
+      - name: "futures"
+        req: "0.3"
+        default_features: true
+      # Client transport bounds reference http_body::Body.
+      - name: "http-body"
+        req: "1"
+        default_features: true
+  # The plugin accepts `extern_path=.=<rust_path>` (or the shorthand
+  # `buffa_module=<rust_path>`) to tell it where the buffa-generated message
+  # types live. BSR should inject this based on the buffa dep's SDK crate
+  # name, same as tonic receives extern_path for its prost dep. Leaving
+  # opts empty here; please advise if an explicit entry is needed.
+  opts: []