Isolate gen token task (#530)

* Warn if cache is down

Instead of crashing because the cache is down, only emit a warning. This
is going to lead to problem when we go multi node, but by that time, I
hope the cache usage will also be re-evaluated instead of used for
*everything*.

* gen_token task doesn't require the entire app to be started

This allow to generate a token without having to stop the app because of
a port conflict.

lib/teiserver/helpers/cache_helper.ex

@@ -32,6 +32,9 @@ defmodule Teiserver.Helpers.CacheHelper do
       "cluster_hooks",
       {:cluster_hooks, :delete, Node.self(), table, keys}
     )
+  catch
+    :exit, :noproc ->
+      Logger.warning("Cache #{table} is down")
   end
 
   def cache_delete(table, key), do: cache_delete(table, [key])
@@ -48,6 +51,9 @@ defmodule Teiserver.Helpers.CacheHelper do
       "cluster_hooks",
       {:cluster_hooks, :put, Node.self(), table, key, value}
     )
+  catch
+    :exit, :noproc ->
+      Logger.warning("Cache #{table} is down")
   end
 
   @doc """

lib/teiserver/mix_tasks/gen_token.ex

@@ -20,7 +20,8 @@ defmodule Mix.Tasks.Teiserver.GenToken do
     {parsed, _, _errors} = OptionParser.parse(args, strict: [user: :string, app: :string])
     shell.info("parsed args: #{inspect(parsed)}")
 
-    Mix.Task.run("ecto.setup")
+    Application.ensure_all_started([:ecto, :ecto_sql, :tzdata])
+    Teiserver.Repo.start_link()
 
     case parsed[:user] do
       nil ->