centralizing pubsub topics

lib/elixir_ai/chat_runner.ex

@@ -3,10 +3,9 @@ defmodule ElixirAi.ChatRunner do
   use GenServer
   import ElixirAi.ChatUtils, only: [ai_tool: 1]
   alias ElixirAi.{Conversation, Message}
+  import ElixirAi.PubsubTopics
 
   defp via(name), do: {:via, Horde.Registry, {ElixirAi.ChatRegistry, name}}
-  defp topic(name), do: "ai_chat:#{name}"
-  def message_topic(name), do: "conversation_messages:#{name}"
 
   def new_user_message(name, text_content) do
     GenServer.cast(via(name), {:user_message, text_content})
@@ -28,7 +27,7 @@ defmodule ElixirAi.ChatRunner do
   def init(name) do
     messages =
       case Conversation.find_id(name) do
-        {:ok, conv_id} -> Message.load_for_conversation(conv_id, topic: message_topic(name))
+        {:ok, conv_id} -> Message.load_for_conversation(conv_id, topic: conversation_message_topic(name))
         _ -> []
       end
 
@@ -78,7 +77,7 @@ defmodule ElixirAi.ChatRunner do
         function: fn %{"color" => color} ->
           Phoenix.PubSub.broadcast(
             ElixirAi.PubSub,
-            "ai_chat:#{name}",
+            chat_topic(name),
             {:set_background_color, color}
           )
         end,
@@ -309,7 +308,7 @@ defmodule ElixirAi.ChatRunner do
     {:reply, state.streaming_response, state}
   end
 
-  defp broadcast_ui(name, msg), do: Phoenix.PubSub.broadcast(ElixirAi.PubSub, topic(name), msg)
+  defp broadcast_ui(name, msg), do: Phoenix.PubSub.broadcast(ElixirAi.PubSub, chat_topic(name), msg)
 
   defp store_message(name, messages) when is_list(messages) do
     Enum.each(messages, &store_message(name, &1))
@@ -319,7 +318,7 @@ defmodule ElixirAi.ChatRunner do
   defp store_message(name, message) do
     Phoenix.PubSub.broadcast(
       ElixirAi.PubSub,
-      message_topic(name),
+      conversation_message_topic(name),
       {:store_message, name, message}
     )
 

lib/elixir_ai/conversation_manager.ex

@@ -1,6 +1,7 @@
 defmodule ElixirAi.ConversationManager do
   use GenServer
   alias ElixirAi.{Conversation, Message}
+  import ElixirAi.PubsubTopics, only: [conversation_message_topic: 1]
   require Logger
 
   @name {:via, Horde.Registry, {ElixirAi.ChatRegistry, __MODULE__}}
@@ -117,7 +118,7 @@ defmodule ElixirAi.ConversationManager do
   def handle_info({:store_message, name, message}, %{conversations: conversations} = state) do
     case Conversation.find_id(name) do
       {:ok, conv_id} ->
-        Message.insert(conv_id, message, topic: ElixirAi.ChatRunner.message_topic(name))
+        Message.insert(conv_id, message, topic: conversation_message_topic(name))
 
       _ ->
         :ok
@@ -164,7 +165,7 @@ defmodule ElixirAi.ConversationManager do
           if MapSet.member?(subscriptions, name) do
             subscriptions
           else
-            Phoenix.PubSub.subscribe(ElixirAi.PubSub, ElixirAi.ChatRunner.message_topic(name))
+            Phoenix.PubSub.subscribe(ElixirAi.PubSub, conversation_message_topic(name))
             MapSet.put(subscriptions, name)
           end
 

lib/elixir_ai/data/ai_provider.ex

@@ -1,6 +1,7 @@
 defmodule ElixirAi.AiProvider do
   alias ElixirAi.Data.DbHelpers
   require Logger
+  import ElixirAi.PubsubTopics
 
   defmodule AiProviderSchema do
     defstruct [:id, :name, :model_name, :api_token, :completions_url]
@@ -77,14 +78,14 @@ defmodule ElixirAi.AiProvider do
       "updated_at" => now
     }
 
-    case DbHelpers.run_sql(sql, params, "ai_providers") do
+    case DbHelpers.run_sql(sql, params, providers_topic()) do
       {:error, :db_error} ->
         {:error, :db_error}
 
       _result ->
         Phoenix.PubSub.broadcast(
           ElixirAi.PubSub,
-          "ai_providers",
+          providers_topic(),
           {:provider_added, attrs}
         )
 
@@ -102,7 +103,7 @@ defmodule ElixirAi.AiProvider do
 
     params = %{"name" => name}
 
-    case DbHelpers.run_sql(sql, params, "ai_providers", AiProviderSchema.schema()) do
+    case DbHelpers.run_sql(sql, params, providers_topic(), AiProviderSchema.schema()) do
       {:error, _} -> {:error, :db_error}
       [] -> {:error, :not_found}
       [row | _] -> {:ok, row |> convert_uuid_to_string() |> then(&struct(AiProviderSchema, &1))}
@@ -113,7 +114,7 @@ defmodule ElixirAi.AiProvider do
     sql = "SELECT COUNT(*) FROM ai_providers"
     params = %{}
 
-    case DbHelpers.run_sql(sql, params, "ai_providers") do
+    case DbHelpers.run_sql(sql, params, providers_topic()) do
       {:error, :db_error} ->
         {:error, :db_error}
 

lib/elixir_ai/pubsub_topics.ex

@@ -0,0 +1,6 @@
+defmodule ElixirAi.PubsubTopics do
+
+  def conversation_message_topic(name), do: "conversation_messages:#{name}"
+  def chat_topic(name), do: "ai_chat:#{name}"
+  def providers_topic, do: "providers"
+end

lib/elixir_ai_web/live/ai_providers_live.ex

@@ -2,10 +2,11 @@ defmodule ElixirAiWeb.AiProvidersLive do
   use ElixirAiWeb, :live_component
   import ElixirAiWeb.FormComponents
   alias ElixirAi.AiProvider
+  import ElixirAi.PubsubTopics
 
   def update(assigns, socket) do
     if connected?(socket) do
-      Phoenix.PubSub.subscribe(ElixirAi.PubSub, "ai_providers")
+      Phoenix.PubSub.subscribe(ElixirAi.PubSub, providers_topic())
     end
 
     {:ok,

lib/elixir_ai_web/live/chat_live.ex

@@ -5,6 +5,7 @@ defmodule ElixirAiWeb.ChatLive do
   import ElixirAiWeb.ChatMessage
   alias ElixirAi.ChatRunner
   alias ElixirAi.ConversationManager
+  import ElixirAi.PubsubTopics
 
   def valid_background_colors do
     [
@@ -21,8 +22,10 @@ defmodule ElixirAiWeb.ChatLive do
   def mount(%{"name" => name}, _session, socket) do
     case ConversationManager.open_conversation(name) do
       {:ok, _pid} ->
-        if connected?(socket),
-          do: Phoenix.PubSub.subscribe(ElixirAi.PubSub, "ai_chat:#{name}")
+        if connected?(socket) do
+          Phoenix.PubSub.subscribe(ElixirAi.PubSub, chat_topic(name))
+          Phoenix.PubSub.subscribe(ElixirAi.PubSub, conversation_message_topic(name))
+        end
 
         conversation = ChatRunner.get_conversation(name)
 
@@ -32,7 +35,8 @@ defmodule ElixirAiWeb.ChatLive do
          |> assign(user_input: "")
          |> assign(messages: conversation.messages)
          |> assign(streaming_response: conversation.streaming_response)
-         |> assign(background_color: "bg-cyan-950/30")}
+         |> assign(background_color: "bg-cyan-950/30")
+         |> assign(db_error: nil)}
 
       {:error, :not_found} ->
         {:ok, push_navigate(socket, to: "/")}
@@ -48,6 +52,11 @@ defmodule ElixirAiWeb.ChatLive do
         </.link>
         {@conversation_name}
       </div>
+      <%= if @db_error do %>
+        <div class="mx-4 mt-2 px-3 py-2 rounded text-sm text-red-400 bg-red-950/40" role="alert">
+          Database error: {@db_error}
+        </div>
+      <% end %>
       <div
         id="chat-messages"
         phx-hook="ScrollBottom"
@@ -191,6 +200,10 @@ defmodule ElixirAiWeb.ChatLive do
      |> assign(streaming_response: nil)}
   end
 
+  def handle_info({:db_error, reason}, socket) do
+    {:noreply, assign(socket, db_error: reason)}
+  end
+
   def handle_info({:set_background_color, color}, socket) do
     Logger.info("setting background color to #{color}")
     {:noreply, assign(socket, background_color: color)}

lib/elixir_ai_web/live/home_live.ex

@@ -3,10 +3,11 @@ defmodule ElixirAiWeb.HomeLive do
   import ElixirAiWeb.FormComponents
   alias ElixirAi.{ConversationManager, AiProvider}
   require Logger
+  import ElixirAi.PubsubTopics
 
   def mount(_params, _session, socket) do
     if connected?(socket) do
-      Phoenix.PubSub.subscribe(ElixirAi.PubSub, "ai_providers")
+      Phoenix.PubSub.subscribe(ElixirAi.PubSub, providers_topic())
       send(self(), :load_data)
     end
 

test/elixir_ai_web/live/chat_live_test.exs

@@ -0,0 +1,26 @@
+defmodule ElixirAiWeb.ChatLiveTest do
+  use ElixirAiWeb.ConnCase, async: false
+  import ElixirAi.PubsubTopics, only: [conversation_message_topic: 1]
+
+  setup do
+    stub(ElixirAi.ConversationManager, :open_conversation, fn _name -> {:ok, self()} end)
+
+    stub(ElixirAi.ChatRunner, :get_conversation, fn _name ->
+      %{messages: [], streaming_response: nil}
+    end)
+
+    :ok
+  end
+
+  test "displays a db error when a db_error message is broadcast", %{conn: conn} do
+    {:ok, view, _html} = live(conn, ~p"/chat/test_conv")
+
+    Phoenix.PubSub.broadcast(
+      ElixirAi.PubSub,
+      conversation_message_topic("test_conv"),
+      {:db_error, "unique constraint violated"}
+    )
+
+    assert render(view) =~ "unique constraint violated"
+  end
+end

test/support/conn_case.ex

@@ -16,6 +16,7 @@ defmodule ElixirAiWeb.ConnCase do
   """
 
   use ExUnit.CaseTemplate
+  use Mimic
 
   using do
     quote do
@@ -27,11 +28,18 @@ defmodule ElixirAiWeb.ConnCase do
       # Import conveniences for testing with connections
       import Plug.Conn
       import Phoenix.ConnTest
+      import Phoenix.LiveViewTest
       import ElixirAiWeb.ConnCase
+      use Mimic
     end
   end
 
+  setup :set_mimic_global
+
   setup _tags do
+    stub(ElixirAi.Data.DbHelpers, :run_sql, fn _sql, _params, _topic -> [] end)
+    stub(ElixirAi.Data.DbHelpers, :run_sql, fn _sql, _params, _topic, _schema -> [] end)
+    stub(ElixirAi.ChatUtils, :request_ai_response, fn _server, _messages, _tools -> :ok end)
     {:ok, conn: Phoenix.ConnTest.build_conn()}
   end
 end

test/test_helper.exs

@@ -1,3 +1,5 @@
 ExUnit.start()
 Mimic.copy(ElixirAi.Data.DbHelpers)
 Mimic.copy(ElixirAi.ChatUtils)
+Mimic.copy(ElixirAi.ConversationManager)
+Mimic.copy(ElixirAi.ChatRunner)