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0.1.0
Spawn is the core lib for Spawn Actors System
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lib/sidecar/grpc/generators/handler_generator.ex
defmodule Sidecar.GRPC.Generators.HandlerGenerator do
@moduledoc """
Module for generating an actor dispatcher with transcoding capabilities for gRPC methods.
This module implements the `ProtobufGenerate.Plugin` behaviour to generate an actor dispatcher
with transcoding capabilities for each gRPC method defined in the Protobuf service.
"""
@behaviour ProtobufGenerate.Plugin
alias Actors.Config.PersistentTermConfig, as: Config
alias Protobuf.Protoc.Generator.Util
@impl true
def template do
"""
defmodule <%= @module %>.ActorDispatcher do
@moduledoc since: "1.2.1"
use GRPC.Server, service: <%= @service_name %>
alias Sidecar.GRPC.Dispatcher
<%= for {method_name, input, output} <- @methods do %>
@spec <%= Macro.underscore(method_name) %>(<%= input %>.t(), GRPC.Server.Stream.t()) :: <%= output %>.t()
def <%= method_name %>(message, stream) do
request = %{
system: <%= inspect(@actor_system) %>,
actor_name: <%= inspect(@actor_name) %>,
action_name: <%= inspect(method_name) %>,
input: message,
stream: stream
}
Dispatcher.dispatch(request)
end
<% end %>
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)])
actor_name = Macro.camelize(svc.name)
actor_system = Config.get(:actor_system_name)
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,
actor_system: actor_system,
actor_name: actor_name,
service_name: mod_name,
methods: methods,
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