Implemented retrieval of alerts history

Tools/GardeningServer/internal_alerts.py

 # Copyright 2014 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.
 
 import datetime
 import alerts
 import json
 import webapp2
 
 from google.appengine.api import users
 
 
 class InternalAlertsHandler(alerts.AlertsHandler):
-    MEMCACHE_INTERNAL_ALERTS_KEY = 'internal-alerts'
+    INTERNAL_ALERTS_TYPE = 'internal-alerts'
 
     # Has no 'request' member.
     # Has no 'response' member.
     # Use of super on an old style class.
     # pylint: disable=E1002,E1101
     def get(self):
         # Require users to be logged to see builder alerts from private/internal
         # trees.
         user = users.get_current_user()
         if not user:
             alerts = {}
             alerts.update({
                 'date': datetime.datetime.utcnow(),
                 'redirect-url': users.create_login_url(self.request.uri)})
             uncompressed = super(InternalAlertsHandler,
                                  self).generate_json_dump(alerts)
             super(InternalAlertsHandler, self).send_json_data(uncompressed)
             return
 
         email = user.email()
         if not email.endswith('@google.com'):
             self.response.set_status(403, 'invalid user')
             return
 
         super(InternalAlertsHandler, self).get_from_memcache(
-            InternalAlertsHandler.MEMCACHE_INTERNAL_ALERTS_KEY)
+            InternalAlertsHandler.INTERNAL_ALERTS_TYPE)
 
     def post(self):
-        self.update_alerts(InternalAlertsHandler.MEMCACHE_INTERNAL_ALERTS_KEY)
+        self.update_alerts(InternalAlertsHandler.INTERNAL_ALERTS_TYPE)
 
 
 app = webapp2.WSGIApplication([
     ('/internal-alerts', InternalAlertsHandler)])