zig -> llvm + oci (#198)

* zig -> llvm

 - add rules_oci
 - update language level to 21

* bazel mod tidy

Author: aaylward

.ijwb/.bazelproject

@@ -16,7 +16,7 @@ additional_languages:
   scala
   go
 
-java_language_level: 17
+java_language_level: 21
 
 build_flags:
   --enable_workspace

MODULE.bazel

@@ -3,6 +3,13 @@ module(
     version = "1.0",
 )
 
+bazel_dep(name = "toolchains_llvm", version = "1.0.0")
+git_override(
+    module_name = "toolchains_llvm",
+    commit = "1d685a99db5f1e6523c392e7dfaced583062cbc4",
+    remote = "https://github.com/bazel-contrib/toolchains_llvm",
+)
+
 bazel_dep(name = "rules_python", version = "0.33.2")
 bazel_dep(name = "protobuf", version = "27.2", repo_name = "com_google_protobuf")
 bazel_dep(name = "grpc", version = "1.63.1.bcr.1", repo_name = "com_github_grpc_grpc")
@@ -12,13 +19,6 @@ bazel_dep(name = "apple_support", version = "1.15.1", repo_name = "build_bazel_a
 bazel_dep(name = "rules_cc", version = "0.0.9")
 bazel_dep(name = "platforms", version = "0.0.10")
 bazel_dep(name = "abseil-cpp", version = "20240116.2", repo_name = "com_google_absl")
-bazel_dep(name = "hermetic_cc_toolchain", version = "3.1.0")
-
-toolchains = use_extension("@hermetic_cc_toolchain//toolchain:ext.bzl", "toolchains")
-use_repo(toolchains, "zig_sdk")
-
-register_toolchains()
-
 bazel_dep(name = "rules_jvm_external", version = "6.2")
 bazel_dep(name = "rules_go", version = "0.48.1", repo_name = "io_bazel_rules_go")
 bazel_dep(name = "bazel_features", version = "1.13.0")
@@ -58,6 +58,19 @@ crate.annotation(
 )
 use_repo(crate, "crates")
 
+llvm = use_extension("@toolchains_llvm//toolchain/extensions:llvm.bzl", "llvm")
+llvm.toolchain(
+    name = "llvm_toolchain",
+    llvm_versions = {
+        "": "15.0.6",
+        "darwin-aarch64": "15.0.7",
+        "darwin-x86_64": "15.0.7",
+    },
+)
+use_repo(llvm, "llvm_toolchain", "llvm_toolchain_llvm")
+
+register_toolchains("@llvm_toolchain//:all")
+
 bazel_dep(name = "rules_java", version = "7.6.5")
 bazel_dep(name = "contrib_rules_jvm", version = "0.27.0")
 bazel_dep(name = "bazel_skylib", version = "1.7.1")
@@ -116,3 +129,18 @@ maven.install(
 use_repo(maven, "maven")
 
 bazel_dep(name = "grpc-java", version = "1.64.0")
+bazel_dep(name = "rules_pkg", version = "0.10.1")
+bazel_dep(name = "rules_oci", version = "2.0.0-beta0")
+
+# For testing, check out https://registry.bazel.build/modules/container_structure_test
+oci = use_extension("@rules_oci//oci:extensions.bzl", "oci")
+oci.pull(
+    name = "docker_lib_ubuntu",
+    image = "docker.io/library/ubuntu",
+    platforms = [
+        "linux/arm64/v8",
+        "linux/amd64",
+    ],
+    tag = "rolling",
+)
+use_repo(oci, "docker_lib_ubuntu", "docker_lib_ubuntu_linux_amd64", "docker_lib_ubuntu_linux_arm64_v8")

MODULE.bazel.lock

@@ -12,6 +12,7 @@ cc_library(
 cc_binary(
     name = "example_service",
     srcs = ["main.cc"],
+    visibility = ["//visibility:public"],
     deps = [
         ":example_service_lib",
         "@com_github_grpc_grpc//:grpc++_reflection",

cpp/example_service/BUILD.bazel

@@ -0,0 +1,33 @@
+load("@rules_oci//oci:defs.bzl", "oci_image", "oci_load")
+load("@rules_pkg//pkg:tar.bzl", "pkg_tar")
+
+# Packaging the binary into tar, which is needed by oci_image rule
+pkg_tar(
+    name = "example_cc_grpc_tar",
+    srcs = ["//cpp/example_service"],
+)
+
+# Making image
+# C++ programs usually need some fundamental libraries such as glibc, libstdc++, etc.
+# Correspondigly, use language-specific distroless images.
+# Here we use docker.io/library/ubuntu image for this C++ program.
+oci_image(
+    name = "example_cc_grpc_image",
+    base = "@docker_lib_ubuntu",
+    entrypoint = ["/example_service"],
+    tars = [":example_cc_grpc_tar"],
+)
+
+# Create tarball from oci image that can be run by container runtime.
+# The image is designated using `repo_tags` attribute.
+oci_load(
+    name = "example_cc_grpc_image_tarball",
+    image = ":example_cc_grpc_image",
+    repo_tags = ["example_cc_grpc:latest"],
+)
+
+filegroup(
+    name = "example_cc_grpc_tarball.tar",
+    srcs = [":example_cc_grpc_image_tarball"],
+    output_group = "tarball",
+)

oci/BUILD.bazel

@@ -0,0 +1,8 @@
+# OCI
+
+```shell
+sudo apt install podman
+bazel run //oci:example_cc_grpc_image_tarball
+podman run -p 8080:8089 example_cc_grpc
+grpcurl -d '{"name": "Friend"}' -plaintext localhost:8080 example_service.Greeter/SayHello
+```

oci/README.md

@@ -1,30 +1,16 @@
 load("@crates//:defs.bzl", "all_crate_deps")
-
-# load("@rules_rust//cargo:defs.bzl", "cargo_build_script")
 load("@rules_rust//rust:defs.bzl", "rust_binary")
 
-#cargo_build_script(
-#    name = "build_script",
-#    srcs = ["build.rs"],
-#    build_script_env = {
-#        "PROTO_PATH": "$(execpath //protos/example_service:proto_files)",
-#    },
-#    data = ["//protos/example_service:proto_files"],
-#    deps = ["@crates//:tonic-build"],
-#)
-
 rust_binary(
     name = "helloworld_tonic_server",
     srcs = ["src/server.rs"],
     crate_name = "helloworld_tonic",
-    # deps = all_crate_deps() + [":build_script"],
     deps = all_crate_deps() + ["//protos/example_service:hello_proto_rust"],
 )
 
 rust_binary(
     name = "helloworld_tonic_client",
     srcs = ["src/client.rs"],
     crate_name = "helloworld_tonic",
-    # deps = all_crate_deps() + [":build_script"],
     deps = all_crate_deps() + ["//protos/example_service:hello_proto_rust"],
 )