simple HTTP RustScript endpoint

Dockerfile

FROM hexpm/elixir:1.13.0-erlang-24.0.3-alpine-3.14.0

RUN mix local.hex --force
RUN mix local.rebar --force

COPY --from=mkhan45/rustscript /bin/rustscript /bin/rustscript
COPY server.exs .

# hacky way to get elixir deps
RUN sh -c "timeout 30s elixir server.exs"

CMD elixir server.exs

rsc_server.exs

Mix.install([
  {:plug_cowboy, "~> 2.0"},
  {:temp, "~> 0.4"}
])

defmodule Server do
  use Plug.Router
  plug(:match)
  plug(:dispatch)

  post "/" do
    case Plug.Conn.read_body(conn) do
      {:ok, rsc_str, _} ->
        try do
          {:ok, path} = Temp.path
          {:ok, file_handle} = File.open(path, [:write])
          IO.puts(file_handle, rsc_str)
          {result, _err_code} = System.cmd("rustscript", [path])
          send_resp(conn, 200, result)
        rescue
          _ -> send_resp(conn, 400, "Server Error")
        end
      res -> 
        IO.inspect(res)
        send_resp(conn, 400, "Send a RustScript string in the request body")
    end
  end

  match _ do
    send_resp(conn, 404, "404")
  end
end

Plug.Cowboy.http(Server, [], port: 4000)
System.no_halt(true)

Run with docker run --memory=128m --cpu-shares=256 -p 4000:4000 -t rsc_endpoints