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# Protobuf Rust runtime packages.
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load("@rules_rust//rust:defs.bzl", "rust_library")
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load("@bazel_skylib//rules:common_settings.bzl", "string_flag")
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load("@rules_proto//proto:defs.bzl", "proto_lang_toolchain")
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package(
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default_visibility = ["//src/google/protobuf:__subpackages__"],
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)
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# Represents the current Rust protobuf runtime for the build. Depending on the value of
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# `:rust_proto_library_kernel` build setting it forwards to the cpp or upb kernels. This is the
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# target that users are expected to depend on.
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#
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# Rust gencode (via `rust_upb_proto_library` and `rust_cc_proto_library`) doesn't depend on this
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# target, instead, it depends on the kernel-specific libraries directly. The reason is that we need
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# to be able to use both kernels in the same build. That allows us to have one tap config for both
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# kernels, and to run tests using a single Blaze invocation.
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#
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# WARNING: It's critical that users do not end up using Rust Protobufs with multiple kernels in
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# their binaries. Currently this is achieved by using bzl visibility on kernel specific rules.
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# TODO(b/149440343): Hide the kernel-specific targets once we can restrict a target visibility to a
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# rule.
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rust_library(
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name = "protobuf",
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srcs = ["protobuf.rs"],
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rustc_flags = select({
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":use_upb_kernel": ["--cfg=upb_kernel"],
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"//conditions:default": ["--cfg=cpp_kernel"],
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}),
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deps = select({
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":use_upb_kernel": ["//rust/upb_kernel:upb"],
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"//conditions:default": ["//rust/cpp_kernel:cpp"],
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}),
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)
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rust_library(
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name = "common",
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srcs = ["common.rs"],
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visibility = ["//rust:__subpackages__"],
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)
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proto_lang_toolchain(
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name = "proto_rust_upb_toolchain",
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command_line = "--rust_out=experimental-codegen=enabled,kernel=upb:$(OUT)",
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progress_message = "Generating Rust proto_library %{label}",
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runtime = "//rust/upb_kernel:upb",
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visibility = ["//visibility:public"],
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)
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proto_lang_toolchain(
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name = "proto_rust_cpp_toolchain",
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command_line = "--rust_out=experimental-codegen=enabled,kernel=cpp:$(OUT)",
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progress_message = "Generating Rust proto_library %{label}",
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runtime = "//rust/cpp_kernel:cpp",
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visibility = ["//visibility:public"],
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)
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# This flag controls what kernel all Rust Protobufs are using in the current build.
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string_flag(
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name = "rust_proto_library_kernel",
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build_setting_default = "cpp",
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values = [
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"upb",
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"cpp",
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],
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)
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config_setting(
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name = "use_upb_kernel",
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flag_values = {
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":rust_proto_library_kernel": "upb",
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},
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)
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