Resolve user info requests coming from the runtime (#2540)

lib/livebook/notebook/app_settings.ex

@@ -42,7 +42,7 @@ defmodule Livebook.Notebook.AppSettings do
       slug: nil,
       multi_session: false,
       zero_downtime: false,
-      show_existing_sessions: true,
+      show_existing_sessions: false,
       auto_shutdown_ms: nil,
       access_type: :protected,
       password: generate_password(),

lib/livebook/runtime.ex

@@ -1093,7 +1093,7 @@ defprotocol Livebook.Runtime do
   @doc """
   Notifies the runtime about connected clients.
   """
-  @spec register_clients(t(), list({client_id(), user_info()})) :: :ok
+  @spec register_clients(t(), list(client_id())) :: :ok
   def register_clients(runtime, clients)
 
   @doc """

lib/livebook/runtime/evaluator/client_tracker.ex

@@ -19,9 +19,9 @@ defmodule Livebook.Runtime.Evaluator.ClientTracker do
   @doc """
   Registeres new connected clients.
   """
-  @spec register_clients(pid(), list({Runtime.client_id(), Runtime.user_info()})) :: :ok
-  def register_clients(client_tracker, clients) do
-    GenServer.cast(client_tracker, {:register_clients, clients})
+  @spec register_clients(pid(), list(Runtime.client_id())) :: :ok
+  def register_clients(client_tracker, client_ids) do
+    GenServer.cast(client_tracker, {:register_clients, client_ids})
   end
 
   @doc """
@@ -34,24 +34,26 @@ defmodule Livebook.Runtime.Evaluator.ClientTracker do
 
   @doc """
   Subscribes the given process to client presence events.
+
+  Returns the list of currently connected clients.
   """
-  @spec monitor_clients(pid(), pid) :: :ok
+  @spec monitor_clients(pid(), pid) :: list(Runtime.client_id())
   def monitor_clients(client_tracker, pid) do
-    GenServer.cast(client_tracker, {:monitor_clients, pid})
+    GenServer.call(client_tracker, {:monitor_clients, pid})
   end
 
   @impl true
   def init({}) do
-    {:ok, %{clients: %{}, subscribers: MapSet.new()}}
+    {:ok, %{client_ids: MapSet.new(), subscribers: MapSet.new()}}
   end
 
   @impl true
-  def handle_cast({:register_clients, clients}, state) do
-    for {client_id, _user_info} <- clients, pid <- state.subscribers do
+  def handle_cast({:register_clients, client_ids}, state) do
+    for client_id <- client_ids, pid <- state.subscribers do
       send(pid, {:client_join, client_id})
     end
 
-    state = update_in(state.clients, &Enum.into(clients, &1))
+    state = update_in(state.client_ids, &Enum.into(client_ids, &1))
 
     {:noreply, state}
   end
@@ -61,20 +63,20 @@ defmodule Livebook.Runtime.Evaluator.ClientTracker do
       send(pid, {:client_leave, client_id})
     end
 
-    state = update_in(state.clients, &Map.drop(&1, client_ids))
+    state =
+      update_in(state.client_ids, fn ids ->
+        Enum.reduce(client_ids, ids, &MapSet.delete(&2, &1))
+      end)
 
     {:noreply, state}
   end
 
-  def handle_cast({:monitor_clients, pid}, state) do
+  @impl true
+  def handle_call({:monitor_clients, pid}, _from, state) do
     Process.monitor(pid)
     state = update_in(state.subscribers, &MapSet.put(&1, pid))
-
-    for {client_id, _user_info} <- state.clients do
-      send(pid, {:client_join, client_id})
-    end
-
-    {:noreply, state}
+    client_ids = MapSet.to_list(state.client_ids)
+    {:reply, client_ids, state}
   end
 
   @impl true

lib/livebook/runtime/evaluator/io_proxy.ex

@@ -373,8 +373,13 @@ defmodule Livebook.Runtime.Evaluator.IOProxy do
   end
 
   defp io_request({:livebook_monitor_clients, pid}, state) do
-    Evaluator.ClientTracker.monitor_clients(state.client_tracker, pid)
-    {:ok, state}
+    client_ids = Evaluator.ClientTracker.monitor_clients(state.client_tracker, pid)
+    {{:ok, client_ids}, state}
+  end
+
+  defp io_request({:livebook_get_user_info, client_id}, state) do
+    result = request_user_info(client_id, state)
+    {result, state}
   end
 
   defp io_request(_, state) do
@@ -444,6 +449,13 @@ defmodule Livebook.Runtime.Evaluator.IOProxy do
     with {:ok, reply} <- runtime_request(state, request, reply_tag), do: reply
   end
 
+  defp request_user_info(client_id, state) do
+    request = {:runtime_user_info_request, self(), client_id}
+    reply_tag = :runtime_user_info_reply
+
+    with {:ok, reply} <- runtime_request(state, request, reply_tag), do: reply
+  end
+
   defp runtime_request(state, request, reply_tag) do
     send(state.send_to, request)
 

lib/livebook/session.ex

@@ -1645,6 +1645,24 @@ defmodule Livebook.Session do
     {:noreply, state}
   end
 
+  def handle_info({:runtime_user_info_request, reply_to, client_id}, state) do
+    reply =
+      cond do
+        not state.data.notebook.teams_enabled ->
+          {:error, :not_available}
+
+        user_id = state.data.clients_map[client_id] ->
+          user = Map.fetch!(state.data.users_map, user_id)
+          {:ok, user_info(user)}
+
+        true ->
+          {:error, :not_found}
+      end
+
+    send(reply_to, {:runtime_user_info_reply, reply})
+    {:noreply, state}
+  end
+
   def handle_info({:runtime_container_down, container_ref, message}, state) do
     broadcast_error(state.session_id, "evaluation process terminated - #{message}")
 
@@ -2085,13 +2103,8 @@ defmodule Livebook.Session do
       Runtime.restore_transient_state(runtime, state.data.runtime_transient_state)
     end
 
-    clients =
-      for {client_id, user_id} <- state.data.clients_map do
-        user = Map.fetch!(state.data.users_map, user_id)
-        {client_id, user_info(user)}
-      end
-
-    Runtime.register_clients(runtime, clients)
+    client_ids = Map.keys(state.data.clients_map)
+    Runtime.register_clients(runtime, client_ids)
 
     %{state | runtime_monitor_ref: runtime_monitor_ref}
   end
@@ -2207,7 +2220,7 @@ defmodule Livebook.Session do
     state = put_in(state.client_id_with_assets[client_id], %{})
 
     if Runtime.connected?(state.data.runtime) do
-      Runtime.register_clients(state.data.runtime, [{client_id, user_info(user)}])
+      Runtime.register_clients(state.data.runtime, [client_id])
     end
 
     app_report_client_count_change(state)

test/livebook/live_markdown/export_test.exs

@@ -1274,7 +1274,7 @@ defmodule Livebook.LiveMarkdown.ExportTest do
             | slug: "app",
               multi_session: true,
               zero_downtime: false,
-              show_existing_sessions: false,
+              show_existing_sessions: true,
               auto_shutdown_ms: 5_000,
               access_type: :public,
               show_source: true,
@@ -1283,7 +1283,7 @@ defmodule Livebook.LiveMarkdown.ExportTest do
       }
 
       expected_document = """
-      <!-- livebook:{"app_settings":{"access_type":"public","auto_shutdown_ms":5000,"multi_session":true,"output_type":"rich","show_existing_sessions":false,"show_source":true,"slug":"app"}} -->
+      <!-- livebook:{"app_settings":{"access_type":"public","auto_shutdown_ms":5000,"multi_session":true,"output_type":"rich","show_existing_sessions":true,"show_source":true,"slug":"app"}} -->
 
       # My Notebook
       """

test/livebook/runtime/erl_dist/runtime_server_test.exs

@@ -353,16 +353,17 @@ defmodule Livebook.Runtime.ErlDist.RuntimeServerTest do
       send(Process.group_leader(), {:io_request, self(), ref, {:livebook_monitor_clients, pid}})
 
       receive do
-        {:io_reply, ^ref, :ok} -> :ok
+        {:io_reply, ^ref, {:ok, ["c1"]}} -> :ok
       end
       """
 
+    RuntimeServer.register_clients(pid, ["c1"])
+
     RuntimeServer.evaluate_code(pid, :elixir, code, {:c1, :e1}, [])
     assert_receive {:runtime_evaluation_response, :e1, _, %{evaluation_time_ms: _time_ms}}
 
-    clients = [{"c1", %{id: "u1", name: "Jake Peralta", email: nil, source: :session}}]
-    RuntimeServer.register_clients(pid, clients)
-    assert_receive {:client_join, "c1"}
+    RuntimeServer.register_clients(pid, ["c2"])
+    assert_receive {:client_join, "c2"}
 
     RuntimeServer.unregister_clients(pid, ["c1"])
     assert_receive {:client_leave, "c1"}

test/livebook/runtime/evaluator/client_tracker_test.exs

@@ -11,8 +11,7 @@ defmodule Livebook.Runtime.Evaluator.ClientTrackerTest do
   test "sends client joins to monitoring processes", %{client_tracker: client_tracker} do
     ClientTracker.monitor_clients(client_tracker, self())
 
-    clients = [{"c1", user_info()}, {"c2", user_info()}]
-    ClientTracker.register_clients(client_tracker, clients)
+    ClientTracker.register_clients(client_tracker, ["c1", "c2"])
 
     assert_receive {:client_join, "c1"}
     assert_receive {:client_join, "c2"}
@@ -21,8 +20,7 @@ defmodule Livebook.Runtime.Evaluator.ClientTrackerTest do
   test "sends client leaves to monitoring processes", %{client_tracker: client_tracker} do
     ClientTracker.monitor_clients(client_tracker, self())
 
-    clients = [{"c1", user_info()}, {"c2", user_info()}]
-    ClientTracker.register_clients(client_tracker, clients)
+    ClientTracker.register_clients(client_tracker, ["c1", "c2"])
 
     ClientTracker.unregister_clients(client_tracker, ["c1"])
     assert_receive {:client_leave, "c1"}
@@ -31,22 +29,10 @@ defmodule Livebook.Runtime.Evaluator.ClientTrackerTest do
     assert_receive {:client_leave, "c2"}
   end
 
-  test "sends existing client joins when monitoring starts", %{client_tracker: client_tracker} do
-    clients = [{"c1", user_info()}, {"c2", user_info()}]
-    ClientTracker.register_clients(client_tracker, clients)
+  test "returns existing client joins when monitoring starts", %{client_tracker: client_tracker} do
+    ClientTracker.register_clients(client_tracker, ["c1", "c2"])
+    ClientTracker.unregister_clients(client_tracker, ["c1"])
 
-    ClientTracker.monitor_clients(client_tracker, self())
-
-    assert_receive {:client_join, "c1"}
-    assert_receive {:client_join, "c2"}
-  end
-
-  defp user_info() do
-    %{
-      id: "u1",
-      name: "Jake Peralta",
-      email: nil,
-      source: :session
-    }
+    assert ClientTracker.monitor_clients(client_tracker, self()) == ["c2"]
   end
 end

test/livebook/session_test.exs

@@ -1901,6 +1901,57 @@ defmodule Livebook.SessionTest do
     end
   end
 
+  describe "accessing client's user info" do
+    test "replies with error when the session does not use teams hub" do
+      session = start_session()
+
+      runtime = connected_noop_runtime(self())
+      Session.set_runtime(session.pid, runtime)
+      send(session.pid, {:runtime_user_info_request, self(), "c1"})
+
+      assert_receive {:runtime_user_info_reply, {:error, :not_available}}
+    end
+
+    test "replies with error when the client does not exist" do
+      notebook = %{Notebook.new() | teams_enabled: true}
+      session = start_session(notebook: notebook)
+
+      runtime = connected_noop_runtime(self())
+      Session.set_runtime(session.pid, runtime)
+      send(session.pid, {:runtime_user_info_request, self(), "c1"})
+
+      assert_receive {:runtime_user_info_reply, {:error, :not_found}}
+    end
+
+    test "replies with user info when the client exists" do
+      notebook = %{Notebook.new() | teams_enabled: true}
+      session = start_session(notebook: notebook)
+
+      user = %{
+        Livebook.Users.User.new()
+        | id: "1234",
+          name: "Jake Peralta",
+          email: "jperalta@example.com"
+      }
+
+      {_, client_id} = Session.register_client(session.pid, self(), user)
+
+      runtime = connected_noop_runtime(self())
+      Session.set_runtime(session.pid, runtime)
+      send(session.pid, {:runtime_user_info_request, self(), client_id})
+
+      assert_receive {:runtime_user_info_reply, {:ok, user_info}}
+
+      assert user_info == %{
+               source: :session,
+               id: "1234",
+               name: "Jake Peralta",
+               email: "jperalta@example.com",
+               payload: nil
+             }
+    end
+  end
+
   test "supports legacy text outputs" do
     session = start_session()
 

test/livebook_web/live/app_live_test.exs

@@ -28,7 +28,14 @@ defmodule LivebookWeb.AppLiveTest do
   describe "multi-session app" do
     test "renders a list of active app sessions", %{conn: conn} do
       slug = Utils.random_short_id()
-      app_settings = %{Notebook.AppSettings.new() | slug: slug, multi_session: true}
+
+      app_settings = %{
+        Notebook.AppSettings.new()
+        | slug: slug,
+          multi_session: true,
+          show_existing_sessions: true
+      }
+
       notebook = %{Notebook.new() | app_settings: app_settings}
 
       Apps.subscribe()