[Predator] Add local cache for get command output.

appengine/findit/lib/cache_decorator.py

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # TODO(http://crbug.com/660466): We should try to break dependencies.
 
 """This module provides a decorator to cache the results of a function.
 
   Examples:
   1. Decorate a function:
@@ skipping 29 matching lines @@
 import functools
 import hashlib
 import inspect
 import logging
 import pickle
 import zlib
 
 from google.appengine.api import memcache
 
 
+# TODO(katesonia): Change this to a better name, e.g. Cache.
 class Cacher(object):
   """An interface to cache and retrieve data.
 
   Subclasses should implement the Get/Set functions.
   TODO: Add a Delete function (default to no-op) if needed later.
   """
   def Get(self, key):
     """Returns the cached data for the given key if available.
 
     Args:
@@ skipping 161 matching lines @@
         except Exception:  # pragma: no cover.
           logging.exception(
               'Failed to cache data for function %s.%s, args=%s, kwargs=%s',
               func.__module__, func.__name__, repr(args), repr(kwargs))
 
       return result
 
     return Wrapped
 
   return Decorator