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Spawn is the core lib for Spawn Actors System
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lib/sidecar/grpc/generators/grpc_with_custom_options.ex
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