Support new Ranch options syntax

Starting with Ranch 2.0, you get a warning when mixing Ranch and TCP socket
options in a single keyword list. We only support the old syntax, so you'll get
warnings at startup, and presumably that syntax will stop working at some
point.

This diff adds support for the new syntax. It does so in a backwards compatible
way, so you can upgrade Ranch and your option syntax either before or after
upgrading elixir-thrift.

Author: pguillory

lib/thrift/binary/framed/server.ex

@@ -54,7 +54,7 @@ defmodule Thrift.Binary.Framed.Server do
     transport_opts =
       opts
       |> Keyword.get(:transport_opts, [])
-      |> Keyword.put(:port, port)
+      |> add_port_to_transport_opts(port)
 
     validate_ssl_configuration!(ssl_opts)
 
@@ -75,6 +75,18 @@ defmodule Thrift.Binary.Framed.Server do
     )
   end
 
+  defp add_port_to_transport_opts(transport_opts, port) when is_list(transport_opts) do
+    # Before Ranch 2.0, transport_opts is a keyword list with a mixture of
+    # Ranch and socket opts.
+    Keyword.put(transport_opts, :port, port)
+  end
+
+  defp add_port_to_transport_opts(transport_opts, port) when is_map(transport_opts) do
+    # After Ranch 2.0, transport_opts is a map with socket opts under its own
+    # key.
+    Map.update(transport_opts, :socket_opts, [port: port], &Keyword.put(&1, :port, port))
+  end
+
   @doc """
   Stops the server.
   """