config_service: set memcache timeout

appengine/config_service/storage.py

 # Copyright 2015 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """Storage of config files."""
 
 import hashlib
 
 from google.appengine.api import app_identity
 from google.appengine.ext import ndb
@@ skipping 252 matching lines @@
   ctx = ndb.get_context()
   cached = yield ctx.memcache_get(cache_key)
   if cached:
     msg = message_factory()
     msg.ParseFromString(cached)
     raise ndb.Return(msg)
 
   cs = get_self_config_set()
   messages = yield get_latest_messages_async([cs], path, message_factory)
   msg = messages[cs]
-  yield ctx.memcache_set(cache_key, msg.SerializeToString())
+  yield ctx.memcache_set(cache_key, msg.SerializeToString(), time=60)
   raise ndb.Return(msg)
 
 
 def compute_hash(content):
   """Computes Blob id by its content.
 
   See Blob docstring for Blob id format.
   """
   sha = hashlib.sha1()
   sha.update('blob %d\0' % len(content))
@@ skipping 11 matching lines @@
   content_hash = content_hash or compute_hash(content)
 
   # pylint: disable=E1120
   if not Blob.get_by_id(content_hash):
     yield Blob(id=content_hash, content=content).put_async()
   raise ndb.Return(content_hash)
 
 
 def import_blob(content, content_hash=None):
   return import_blob_async(content, content_hash=content_hash).get_result()