Revert "caching invalidation logic: default 180s, if intend to be invariant, specify as -1 explicitly in config.yml"

This reverts commit eb4f0e5.

Author: phylsix

workflowwebtools/default/config.yml

@@ -78,10 +78,7 @@ cluster:
     midpoint: 50
 # Refresh cached jsons in WorkflowWebTools.workflowinfo jsons
 # This is maximum age in seconds
-# If you want a cache invariant, specify it with -1 explicitly,
-# otherwise the default invalidation period is 180s.
 cache_refresh:
   errors: 345600
-  workflow_params: -1
 workspace: '.'
 refresh_period: 15

workflowwebtools/workflowinfo.py

@@ -19,7 +19,7 @@
 
 from . import serverconfig
 
-def cached_json(attribute, timeout=180):
+def cached_json(attribute, timeout=None):
     """
     A decorator for caching dictionaries in local files.
 
@@ -47,8 +47,7 @@ def function_wrapper(self, *args, **kwargs):
             :returns: Output of the originally decorated function
             :rtype: dict
             """
-            tmout = serverconfig.config_dict()['cache_refresh'].get(attribute) or timeout
-            if tmout == -1: tmout = None
+            tmout = timeout or serverconfig.config_dict()['cache_refresh'].get(attribute)
 
             if not os.path.exists(self.cache_dir):
                 os.mkdir(self.cache_dir)