Handle page_bundle_path channel messages

lib/hologram/socket/channel.ex

@@ -1,8 +1,10 @@
 defmodule Hologram.Socket.Channel do
   use Phoenix.Channel
 
+  alias Hologram.Assets.PageDigestRegistry
   alias Hologram.Compiler.Encoder
   alias Hologram.Component.Action
+  alias Hologram.Router.Helpers, as: RouterHelpers
   alias Hologram.Server
   alias Hologram.Socket.Decoder
   alias Hologram.Template.Renderer
@@ -49,4 +51,15 @@ defmodule Hologram.Socket.Channel do
 
     {:reply, {:ok, html}, socket}
   end
+
+  @impl Phoenix.Channel
+  def handle_in("page_bundle_path", payload, socket) do
+    page_bundle_path =
+      payload
+      |> Decoder.decode()
+      |> PageDigestRegistry.lookup()
+      |> RouterHelpers.page_bundle_path()
+
+    {:reply, {:ok, page_bundle_path}, socket}
+  end
 end

test/elixir/hologram/socket/channel_test.exs

@@ -184,6 +184,17 @@ defmodule Hologram.Socket.ChannelTest do
     end
   end
 
+  test "handle_in/3, page_bundle_path" do
+    stub_with(PageDigestRegistryMock, PageDigestRegistryStub)
+    setup_page_digest_registry(PageDigestRegistryStub)
+    ETS.put(PageDigestRegistryStub.ets_table_name(), Module2, "12345678901234567890123456789012")
+
+    payload = [1, "__atom__:Elixir.Hologram.Test.Fixtures.Socket.Channel.Module2"]
+
+    assert handle_in("page_bundle_path", payload, :dummy_socket) ==
+             {:reply, {:ok, "/hologram/page-12345678901234567890123456789012.js"}, :dummy_socket}
+  end
+
   describe "join/3" do
     test "valid topic name" do
       assert join("hologram", :dummy_payload, :dummy_socket) == {:ok, :dummy_socket}