Get current consumer_group offset

lib/consumer_offsets_consumer_group.ex

@@ -0,0 +1,26 @@
+defmodule ConsumerOffsetsGenConsumer do
+  use KafkaEx.GenConsumer
+
+  alias KafkaEx.Protocol.Fetch.Message
+
+  require Logger
+
+  def handle_message_set(message_set, state) do
+    for %Message{key: key, offset: offset} <- message_set do
+      Logger.info(fn -> "offset: " <> inspect(offset) end)
+
+      consumer_group = get_consumer_group(key)
+    end
+
+    {:async_commit, state}
+  end
+
+  defp get_consumer_group(<<prefix, version, postfix::binary-size(2), consumer_group::binary>>) do
+    Logger.debug(fn -> "prefix: " <> inspect(prefix) end)
+    Logger.debug(fn -> "version: " <> inspect(version) end)
+    Logger.debug(fn -> "postfix: " <> inspect(postfix) end)
+
+    consumer_group
+  end
+
+end