Move api_key resolution to OpenAI module

lib/open_ai.ex

@@ -4,7 +4,7 @@ defmodule OpenAI do
   def gpt(completion) do
     {:ok, collector} = Agent.start_link(fn -> "" end)
 
-    API.gpt_stream(completion, fn data ->
+    API.gpt_stream(completion, api_key(), fn data ->
       case get_in(data, ["choices", Access.at(0), "delta", "content"]) do
         nil -> :ok
         data -> Agent.update(collector, fn current -> current <> data end)
@@ -15,4 +15,9 @@ defmodule OpenAI do
     Agent.stop(collector)
     {:ok, result}
   end
+
+  defp api_key do
+    Application.get_env(:music_library, __MODULE__)
+    |> Keyword.fetch!(:api_key)
+  end
 end

lib/open_ai/api.ex

@@ -1,6 +1,6 @@
 defmodule OpenAI.API do
   # Lifted from https://fly.io/phoenix-files/streaming-openai-responses/
-  def gpt_stream(completion, cb) do
+  def gpt_stream(completion, api_key, cb) do
     fun = fn request, finch_request, finch_name, finch_options ->
       fun = fn
         {:status, status}, response ->
@@ -39,19 +39,19 @@ defmodule OpenAI.API do
         stream: true,
         temperature: completion.temperature
       },
-      auth: {:bearer, api_key()},
+      auth: {:bearer, api_key},
       finch_request: fun
     )
   end
 
-  def get_embeddings(text) do
+  def get_embeddings(text, api_key) do
     resp =
       Req.post!("https://api.openai.com/v1/embeddings",
         json: %{
           input: text,
           model: "text-embedding-3-small"
         },
-        auth: {:bearer, api_key()}
+        auth: {:bearer, api_key}
       )
 
     if resp.status == 200 do
@@ -65,9 +65,4 @@ defmodule OpenAI.API do
   defp decode_body("", _), do: :ok
   defp decode_body("[DONE]", _), do: :ok
   defp decode_body(json, cb), do: cb.(JSON.decode!(json))
-
-  defp api_key do
-    Application.get_env(:music_library, OpenAI)
-    |> Keyword.fetch!(:api_key)
-  end
 end