feat: add full_name callback to proto messages

Author: yordis

lib/protobuf.ex

@@ -82,6 +82,9 @@ defmodule Protobuf do
         Protobuf.Builder.new!(__MODULE__, attrs)
       end
 
+      @impl unquote(__MODULE__)
+      def full_name(), do: @options[:full_name]
+
       @impl unquote(__MODULE__)
       def transform_module() do
         nil
@@ -175,6 +178,11 @@ defmodule Protobuf do
   """
   @callback transform_module() :: module() | nil
 
+  @doc """
+  Returns the fully qualified name of the descriptor's target.
+  """
+  @callback full_name() :: String.t()
+
   @doc """
   Decodes the given binary data interpreting it as the Protobuf message `module`.
 

lib/protobuf/protoc/generator/enum.ex

@@ -19,9 +19,15 @@ defmodule Protobuf.Protoc.Generator.Enum do
   def generate(%Context{namespace: ns} = ctx, %Google.Protobuf.EnumDescriptorProto{} = desc) do
     msg_name = Util.mod_name(ctx, ns ++ [Macro.camelize(desc.name)])
 
+    full_name =
+      [ctx.package | ns ++ [Macro.camelize(desc.name)]]
+      |> Enum.reject(&is_nil/1)
+      |> Enum.join(".")
+
     use_options =
       Util.options_to_str(%{
         syntax: ctx.syntax,
+        full_name: "\"#{full_name}\"",
         enum: true,
         protoc_gen_elixir_version: "\"#{Util.version()}\""
       })

lib/protobuf/protoc/generator/message.ex

@@ -35,6 +35,7 @@ defmodule Protobuf.Protoc.Generator.Message do
     msg_name = Util.mod_name(ctx, new_ns)
     fields = get_fields(ctx, desc)
     extensions = get_extensions(desc)
+    full_name = [ctx.package | new_ns] |> Enum.reject(&is_nil/1) |> Enum.join(".")
 
     descriptor_fun_body =
       if ctx.gen_descriptors? do
@@ -52,7 +53,7 @@ defmodule Protobuf.Protoc.Generator.Message do
          message_template(
            comment: Comment.get(ctx),
            module: msg_name,
-           use_options: msg_opts_str(ctx, desc.options),
+           use_options: msg_opts_str(ctx, desc.options, full_name),
            oneofs: desc.oneof_decl,
            fields: gen_fields(ctx.syntax, fields),
            descriptor_fun_body: descriptor_fun_body,
@@ -98,14 +99,15 @@ defmodule Protobuf.Protoc.Generator.Message do
     ":#{f[:name]}, #{f[:number]}, #{label_str}type: #{f[:type]}#{opts_str}"
   end
 
-  defp msg_opts_str(%{syntax: syntax}, opts) do
+  defp msg_opts_str(%{syntax: syntax}, opts, full_name) do
     msg_options = opts
 
     opts = %{
       syntax: syntax,
       map: msg_options && msg_options.map_entry,
       deprecated: msg_options && msg_options.deprecated,
-      protoc_gen_elixir_version: "\"#{Util.version()}\""
+      protoc_gen_elixir_version: "\"#{Util.version()}\"",
+      full_name: "\"#{full_name}\""
     }
 
     str = Util.options_to_str(opts)

test/protobuf/protoc/generator/enum_test.exs

@@ -68,7 +68,7 @@ defmodule Protobuf.Protoc.Generator.EnumTest do
     assert inspect(compiled_mod) == module
 
     assert msg =~ "defmodule #{module} do\n"
-    assert msg =~ "use Protobuf, enum: true, protoc_gen_elixir_version: \"#{Util.version()}\"\n"
+    assert msg =~ "use Protobuf, enum: true, full_name: \"#{module}\", protoc_gen_elixir_version: \"#{Util.version()}\"\n"
 
     refute msg =~ "defstruct "