Optimize Phoenix Component caching

lib/heroicons/cache.ex

@@ -12,69 +12,42 @@ defmodule Heroicons.Cache do
   @doc false
   def start_link(_), do: GenServer.start_link(__MODULE__, [], name: @name)
 
-  @doc "Fetch a pre-compiled Phoenix Component from the cache or disk, given a `path`"
-  def fetch_component(path) do
-    case :ets.lookup(@name.Components, path) do
-      [{^path, component}] ->
-        component
-
-      [] ->
-        GenServer.call(@name, {:cache_component, path})
-    end
-  end
-
-  @doc "Fetch a icon's body from the cache or disk, given a `path`"
-  def fetch_body(path) do
+  @doc "Fetch a icon's body and fingerprint from the cache or disk, given a `path`"
+  def fetch_icon(path) do
     case :ets.lookup(@name, path) do
-      [{^path, body}] ->
-        body
+      [{^path, icon_body, fingerprint}] ->
+        {icon_body, fingerprint}
 
       [] ->
-        GenServer.call(@name, {:cache_body, path})
+        GenServer.call(@name, {:cache_icon, path})
     end
   end
 
   @impl true
   def init(_) do
     :ets.new(@name, [:set, :protected, :named_table])
-    :ets.new(@name.Components, [:set, :protected, :named_table])
 
     {:ok, []}
   end
 
   @impl true
-  def handle_call({:cache_body, path}, _ref, state) do
-    body = read_body(path)
+  def handle_call({:cache_icon, path}, _ref, state) do
+    {icon_body, fingerprint} = read_icon(path)
 
-    :ets.insert_new(@name, {path, body})
+    :ets.insert_new(@name, {path, icon_body, fingerprint})
 
-    {:reply, body, state}
+    {:reply, {icon_body, fingerprint}, state}
   end
 
-  def handle_call({:cache_component, path}, _ref, state) do
-    body = read_body(path)
-
-    component =
-      EEx.compile_string("<svg {@attrs}" <> body,
-        engine: Phoenix.LiveView.HTMLEngine,
-        file: __ENV__.file,
-        line: __ENV__.line + 1,
-        module: __ENV__.module,
-        indentation: 0
-      )
-
-    :ets.insert_new(@name.Components, {path, component})
-
-    {:reply, component, state}
-  end
-
-  defp read_body(path) do
+  defp read_icon(path) do
     icon =
       Path.join(:code.priv_dir(:heroicons), path)
       |> File.read!()
 
-    <<"<svg ", body::binary>> = icon
+    <<"<svg", icon_body::binary>> = icon
 
-    body
+    <<fingerprint::8*16>> = :erlang.md5(icon)
+
+    {icon_body, fingerprint}
   end
 end