add gRPC callout support

Signed-off-by: Rei Shimizu <[email protected]>

Author: Shikugawa

.github/workflows/rust.yml

@@ -88,6 +88,7 @@ jobs:
 
     - name: Update Rust
       run: |
+        sudo apt install -y protobuf-compiler
         rustup toolchain install stable --component clippy --component rustfmt
         rustup target add wasm32-unknown-unknown
         rustup target add wasm32-wasi
@@ -142,6 +143,7 @@ jobs:
 
     - name: Update Rust
       run: |
+        sudo apt install -y protobuf-compiler
         rustup toolchain install nightly --component clippy --component rustfmt
         rustup +nightly target add wasm32-unknown-unknown
         rustup +nightly target add wasm32-wasi

Cargo.toml

@@ -19,6 +19,10 @@ wee_alloc = { version = "0.4", optional = true }
 [dev-dependencies]
 cfg-if = "1.0"
 chrono = "0.4"
+protobuf = "2"
+
+[build-dependencies]
+protoc-rust = "2.0"
 
 [target.'cfg(not(all(target_arch = "wasm32", target_os = "unknown")))'.dev-dependencies]
 getrandom = "0.2"
@@ -57,3 +61,8 @@ crate-type = ["cdylib"]
 name = "http_config"
 path = "examples/http_config.rs"
 crate-type = ["cdylib"]
+
+[[example]]
+name = "grpc_call"
+path = "examples/grpc_call/main.rs"
+crate-type = ["cdylib"]

bazel/cargo/BUILD.bazel

@@ -57,6 +57,15 @@ alias(
     ],
 )
 
+alias(
+    name = "protobuf",
+    actual = "@raze__protobuf__2_22_1//:protobuf",
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+)
+
 # Export file for Stardoc support
 exports_files(
     [

bazel/cargo/crates.bzl

@@ -121,6 +121,15 @@ def raze_fetch_remote_crates():
         build_file = Label("//bazel/cargo/remote:BUILD.once_cell-1.7.2.bazel"),
     )
 
+    maybe(
+        http_archive,
+        name = "raze__protobuf__2_22_1",
+        url = "https://crates.io/api/v1/crates/protobuf/2.22.1/download",
+        type = "tar.gz",
+        strip_prefix = "protobuf-2.22.1",
+        build_file = Label("//bazel/cargo/remote:BUILD.protobuf-2.22.1.bazel"),
+    )
+
     maybe(
         http_archive,
         name = "raze__time__0_1_43",

bazel/cargo/remote/BUILD.protobuf-2.22.1.bazel

@@ -0,0 +1,87 @@
+"""
+@generated
+cargo-raze crate build file.
+
+DO NOT EDIT! Replaced on runs of cargo-raze
+"""
+
+# buildifier: disable=load
+load("@bazel_skylib//lib:selects.bzl", "selects")
+
+# buildifier: disable=load
+load(
+    "@rules_rust//rust:rust.bzl",
+    "rust_binary",
+    "rust_library",
+    "rust_test",
+)
+
+package(default_visibility = [
+    # Public for visibility by "@raze__crate__version//" targets.
+    #
+    # Prefer access through "//bazel/cargo", which limits external
+    # visibility to explicit Cargo.toml dependencies.
+    "//visibility:public",
+])
+
+licenses([
+    "notice",  # MIT from expression "MIT"
+])
+
+# Generated Targets
+# buildifier: disable=out-of-order-load
+# buildifier: disable=load-on-top
+load(
+    "@rules_rust//cargo:cargo_build_script.bzl",
+    "cargo_build_script",
+)
+
+cargo_build_script(
+    name = "protobuf_build_script",
+    srcs = glob(["**/*.rs"]),
+    build_script_env = {
+    },
+    crate_features = [
+    ],
+    crate_root = "build.rs",
+    data = glob(["**"]),
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    version = "2.22.1",
+    visibility = ["//visibility:private"],
+    deps = [
+    ],
+)
+
+# Unsupported target "coded_input_stream" with type "bench" omitted
+
+# Unsupported target "coded_output_stream" with type "bench" omitted
+
+rust_library(
+    name = "protobuf",
+    srcs = glob(["**/*.rs"]),
+    crate_features = [
+    ],
+    crate_root = "src/lib.rs",
+    crate_type = "lib",
+    data = [],
+    edition = "2018",
+    rustc_flags = [
+        "--cap-lints=allow",
+    ],
+    tags = [
+        "cargo-raze",
+        "manual",
+    ],
+    version = "2.22.1",
+    # buildifier: leave-alone
+    deps = [
+        ":protobuf_build_script",
+    ],
+)

build.rs

@@ -0,0 +1,23 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+fn main() {
+    let proto_files = vec!["examples/grpc_call/helloworld.proto"];
+
+    protoc_rust::Codegen::new()
+        .out_dir("examples/grpc_call")
+        .inputs(proto_files)
+        .run()
+        .expect("running protoc failed");
+}

examples/grpc_call/helloworld.proto

@@ -0,0 +1,38 @@
+// Copyright 2015 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+option go_package = "google.golang.org/grpc/examples/helloworld/helloworld";
+option java_multiple_files = true;
+option java_package = "io.grpc.examples.helloworld";
+option java_outer_classname = "HelloWorldProto";
+
+package helloworld;
+
+// The greeting service definition.
+service Greeter {
+  // Sends a greeting
+  rpc SayHello (HelloRequest) returns (HelloReply) {}
+}
+
+// The request message containing the user's name.
+message HelloRequest {
+  string name = 1;
+}
+
+// The response message containing the greetings
+message HelloReply {
+  string message = 1;
+}