implement 'update()' for caches

gallery_dl/cache.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2016-2017 Mike Fährmann
+# Copyright 2016-2018 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -187,12 +187,14 @@ class CacheDecorator():
         return functools.partial(self.__call__, obj)
 
     def invalidate(self, key=None):
-        if key is None:
-            key = self.key
-        else:
-            key = "%s-%s" % (self.key, key)
+        key = "%s-%s" % (self.key, key) if key else self.key
         del self.cache[key]
 
+    def update(self, key, result):
+        key = "%s-%s" % (self.key, key) if key else self.key
+        expires = int(time.time() + self.maxage)
+        self.cache[key] = result, expires
+
 
 def build_cache_decorator(*modules):
     if len(modules) > 1:

gallery_dl/extractor/deviantart.py

@@ -577,8 +577,7 @@ class DeviantartAPI():
             raise exception.AuthenticationError('"{} ({})"'.format(
                 data.get("error_description"), data.get("error")))
         if refresh_token:
-            _refresh_token_cache.invalidate(refresh_token)
-            _refresh_token_cache(refresh_token, data["refresh_token"])
+            _refresh_token_cache.update(refresh_token, data["refresh_token"])
         return "Bearer " + data["access_token"]
 
     def _call(self, endpoint, params=None, expect_error=False, public=True):