From 90e1877591ef5bcff1daade91b2c0ca22ed68725 Mon Sep 17 00:00:00 2001
From: Aurélien Bompard <aurelien@bompard.org>
Date: Nov 06 2017 09:25:36 +0000
Subject: Use a hash of the config in the key cache


Because some configurations can be very long.

---

diff --git a/hubs/tests/test_widget_caching.py b/hubs/tests/test_widget_caching.py
index 2b9ec36..0a92421 100644
--- a/hubs/tests/test_widget_caching.py
+++ b/hubs/tests/test_widget_caching.py
@@ -38,7 +38,8 @@ class CachedFunctionTest(APPTest):
         super(CachedFunctionTest, self).tearDown()
 
     def test_get_cache_key(self):
-        value = '%d|DummyFunction|{"text": "Testing."}' % self.w_instance.idx
+        value = ('%d|DummyFunction|c7540fbb81683902959eb96e23be42ba'
+                 % self.w_instance.idx)
         self.assertEqual(
             self.fn.get_cache_key(),
             value.encode("ascii"),
diff --git a/hubs/widgets/caching.py b/hubs/widgets/caching.py
index 6a499a5..69da12c 100644
--- a/hubs/widgets/caching.py
+++ b/hubs/widgets/caching.py
@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 import datetime
+import hashlib
 import json
 import logging
 
@@ -61,7 +62,11 @@ class CachedFunction(object):
     def get_cache_key(self):
         key_elements = [str(self.instance.idx), self.__class__.__name__]
         if self.invalidate_on_config_change:
-            key_elements.append(json.dumps(self.instance.config))
+            key_elements.append(
+                hashlib.md5(
+                    json.dumps(self.instance.config).encode("utf-8")
+                ).hexdigest()
+            )
         return "|".join(key_elements).encode('utf-8')
 
     def get_data(self):