Merge branch 'feature/rich-media-cachex' into 'develop'

rich media: use cachex to avoid flooding remote servers

See merge request pleroma/pleroma!629

lib/pleroma/application.ex

@@ -63,6 +63,17 @@ def start(_type, _args) do
           ],
           id: :cachex_object
         ),
+        worker(
+          Cachex,
+          [
+            :rich_media_cache,
+            [
+              default_ttl: :timer.minutes(120),
+              limit: 5000
+            ]
+          ],
+          id: :cachex_rich_media
+        ),
         worker(
           Cachex,
           [

lib/pleroma/web/rich_media/parser.ex

@@ -1,7 +1,14 @@
 defmodule Pleroma.Web.RichMedia.Parser do
   @parsers [Pleroma.Web.RichMedia.Parsers.OGP]
 
-  def parse(url) do
+  if Mix.env() == :test do
+    def parse(url), do: parse_url(url)
+  else
+    def parse(url),
+      do: {:commit, Cachex.fetch!(:rich_media_cache, url, fn _ -> parse_url(url) end)}
+  end
+
+  defp parse_url(url) do
     {:ok, %Tesla.Env{body: html}} = Pleroma.HTTP.get(url)
 
     html |> maybe_parse() |> get_parsed_data()