feat: allow proto_library as rb_library#dep

Author: alexeagle

MODULE.bazel

@@ -16,6 +16,9 @@ bazel_dep(name = "platforms", version = "0.0.5")
 bazel_dep(name = "rules_cc", version = "0.0.9")
 bazel_dep(name = "rules_java", version = "7.2.0")
 
+# NB: LOWER BOUND on earliest BCR release of protobuf module, to avoid upgrading the root module by accident
+bazel_dep(name = "protobuf", version = "3.19.6")
+
 # Ruleset development dependencies.
 bazel_dep(name = "aspect_bazel_lib", version = "2.21.2", dev_dependency = True)
 bazel_dep(name = "bazel_skylib_gazelle_plugin", version = "1.8.2", dev_dependency = True)

ruby/BUILD

@@ -9,6 +9,11 @@ toolchain_type(
     visibility = ["//visibility:public"],
 )
 
+toolchain_type(
+    name = "ruby_grpc_protoc_plugin.toolchain_type",
+    visibility = ["//visibility:public"],
+)
+
 bzl_library(
     name = "defs",
     srcs = ["defs.bzl"],

ruby/private/library.bzl

@@ -1,5 +1,6 @@
 "Implementation details for rb_library"
 
+load("//ruby/private:proto.bzl", "ruby_proto_aspect")
 load(
     "//ruby/private:providers.bzl",
     "BundlerInfo",
@@ -18,6 +19,8 @@ ATTRS = {
     ),
     "deps": attr.label_list(
         doc = "List of other Ruby libraries the target depends on.",
+        # Convert proto_library deps to provide RubyFilesInfo
+        aspects = [ruby_proto_aspect],
     ),
     "data": attr.label_list(
         allow_files = True,

ruby/private/providers.bzl

@@ -29,6 +29,13 @@ GemInfo = provider(
     },
 )
 
+GrpcPluginInfo = provider(
+    doc = "Provider for the gRPC plugin to use for proto services generation.",
+    fields = {
+        "grpc_plugin": "The gRPC plugin executable.",
+    },
+)
+
 # https://bazel.build/rules/depsets
 
 def get_transitive_srcs(srcs, deps):