support no expire in getcache

test/test_cache.py

@@ -42,6 +42,18 @@ def test_get_cache():
     assert c.u1 == [100]
 
 
+def test_get_cache_no_expire():
+    # force a value in cache, try if reget corrupted value
+    od1 = make_description()
+    c = Config(od1)
+    values = c.cfgimpl_get_values()
+    settings = c.cfgimpl_get_settings()
+    settings._p_.setcache('u1', set(['inject2']), None)
+    assert 'inject2' in settings[od1.u1]
+    values._p_.setcache('u1', 200, None)
+    assert c.u1 == [200]
+
+
 def test_cache_reset():
     od1 = make_description()
     c = Config(od1)

tiramisu/storage/cache.py

@@ -32,7 +32,7 @@ class Cache(object):
 
     def getcache(self, path, exp):
         value, created = self._cache[path]
-        if exp <= created:
+        if created is None or exp <= created:
             return True, value
         return False, None