fix: overrides problematic protobuf_generate default plugin

Author: sleipnir

lib/sidecar/grpc/code_generator.ex

@@ -43,7 +43,7 @@ defmodule Sidecar.GRPC.CodeGenerator do
 
     {grpc_generator_plugin, handler_generator_plugin} =
       if transcoding_enabled? do
-        {ProtobufGenerate.Plugins.GRPCWithOptions,
+        {Sidecar.GRPC.Generators.GRPCWithCustomOptions,
          Sidecar.GRPC.Generators.HandlerTranscodingGenerator}
       else
         {ProtobufGenerate.Plugins.GRPC, Sidecar.GRPC.Generators.HandlerGenerator}

lib/sidecar/grpc/generators/grpc_with_custom_options.ex

@@ -0,0 +1,86 @@
+defmodule Sidecar.GRPC.Generators.GRPCWithCustomOptions do
+  # ref: https://github.com/elixir-protobuf/protobuf/blob/main/lib/protobuf/protoc/generator/grpc.ex
+  @moduledoc """
+  Plugin to Generate gRPC code from protbuf service definitions, this plugin outputs any extension options
+  on service methods as a param to [`GRPC.Service.rpc/4`](https://github.com/drowzy/grpc/blob/grpc_transcoding/lib/grpc/service.ex#L56)
+  """
+
+  @behaviour ProtobufGenerate.Plugin
+
+  alias Protobuf.Protoc.Generator.Util
+
+  @impl true
+  def template do
+    """
+    defmodule <%= @module %>.Service do
+      use GRPC.Service, name: <%= inspect(@service_name) %>, protoc_gen_elixir_version: "<%= @version %>"
+
+      <%= if @descriptor_fun_body do %>
+       def descriptor do
+         # credo:disable-for-next-line
+         <%= @descriptor_fun_body %>
+       end
+      <% end %>
+
+     <%= for {method_name, input, output, options} <- @methods do %>
+       rpc :<%= method_name %>, <%= input %>, <%= output %>, <%= options %>
+     <% end %>
+    end
+
+    defmodule <%= @module %>.Stub do
+      use GRPC.Stub, service: <%= @module %>.Service
+    end
+    """
+  end
+
+  @impl true
+  def generate(ctx, %Google.Protobuf.FileDescriptorProto{service: svcs} = desc) do
+    for svc <- svcs do
+      mod_name = Util.mod_name(ctx, [Macro.camelize(svc.name)])
+      name = Util.prepend_package_prefix(ctx.package, svc.name)
+
+      descriptor_fun_body =
+        if ctx.gen_descriptors? do
+          Util.descriptor_fun_body(desc)
+        else
+          nil
+        end
+
+      methods =
+        for m <- svc.method do
+          input = service_arg(Util.type_from_type_name(ctx, m.input_type), m.client_streaming)
+          output = service_arg(Util.type_from_type_name(ctx, m.output_type), m.server_streaming)
+
+          options =
+            m.options
+            |> opts()
+            |> inspect(limit: :infinity)
+
+          {m.name, input, output, options}
+        end
+
+      {mod_name,
+       [
+         module: mod_name,
+         service_name: name,
+         methods: methods,
+         descriptor_fun_body: descriptor_fun_body,
+         version: Util.version()
+       ]}
+    end
+  end
+
+  defp service_arg(type, _streaming? = true), do: "stream(#{type})"
+  defp service_arg(type, _streaming?), do: type
+
+  defp opts(%Google.Protobuf.MethodOptions{__pb_extensions__: extensions})
+       when extensions == %{} do
+    %{}
+  end
+
+  defp opts(%Google.Protobuf.MethodOptions{__pb_extensions__: extensions}) do
+    for {{type, field}, value} <- extensions, into: %{} do
+      {field, %{type: type, value: value}}
+    end
+  end
+end