Connection Pool: don't enforce pool limits if no new connection needs to be opened

lib/pleroma/gun/connection_pool.ex

@@ -2,8 +2,6 @@ defmodule Pleroma.Gun.ConnectionPool do
   @registry __MODULE__
 
   def get_conn(uri, opts) do
-    case enforce_pool_limits() do
-      :ok ->
     key = "#{uri.scheme}:#{uri.host}:#{uri.port}"
 
     case Registry.lookup(@registry, key) do
@@ -16,6 +14,8 @@ def get_conn(uri, opts) do
         {:ok, gun_pid}
 
       [] ->
+        case enforce_pool_limits() do
+          :ok ->
             # :gun.set_owner fails in :connected state for whatevever reason,
             # so we open the connection in the process directly and send it's pid back
             # We trust gun to handle timeouts by itself
@@ -33,12 +33,12 @@ def get_conn(uri, opts) do
               err ->
                 err
             end
-        end
 
           :error ->
             {:error, :pool_full}
         end
     end
+  end
 
   @enforcer_key "enforcer"
   defp enforce_pool_limits() do