[Culprit-Finder] Seperate gae related part in cache_decorator and gitile repository to gae_libs/

appengine/findit/waterfall/send_notification_for_culprit_pipeline.py

 # Copyright 2016 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.
 
 from datetime import datetime
 import logging
 import textwrap
 
 from google.appengine.ext import ndb
 
 from common.http_client_appengine import HttpClientAppengine as HttpClient
 from common.pipeline_wrapper import BasePipeline
+from gae_libs.gitiles.cached_gitiles_repository import CachedGitilesRepository
 from infra_api_clients.codereview.rietveld import Rietveld
 from lib import time_util
-from lib.gitiles.gitiles_repository import GitilesRepository
 from model import analysis_status as status
 from model.wf_analysis import WfAnalysis
 from model.wf_culprit import WfCulprit
 from waterfall import build_util
 from waterfall import waterfall_config
 
 
 def _AdditionalCriteriaAllPassed(additional_criteria):
   """Check if the all the additional criteria have passed.
 
@@ skipping 59 matching lines @@
 
   _UpdateNotificationStatus(repo_name, revision,
                             status.COMPLETED if sent else status.ERROR)
   return sent
 
 
 def _GetCulpritInfo(repo_name, revision):
   """Returns commit position/time and code-review url of the given revision."""
   # TODO(stgao): get repo url at runtime based on the given repo name.
   # unused arg - pylint: disable=W0612,W0613
-  repo = GitilesRepository(
+  repo = CachedGitilesRepository(
       HttpClient(), 'https://chromium.googlesource.com/chromium/src.git')
   change_log = repo.GetChangeLog(revision)
   return change_log.commit_position, change_log.code_review_url
 
 
 def _WithinNotificationTimeLimit(build_end_time, latency_limit_minutes):
   """Returns True if it is still in time to send notification."""
   latency_seconds = (time_util.GetUTCNow() - build_end_time).total_seconds()
   return latency_seconds <= latency_limit_minutes * 60
 
@@ skipping 26 matching lines @@
         'within_time_limit': within_time_limit
     }
 
     if not _ShouldSendNotification(
       master_name, builder_name, build_number, repo_name,
       revision, commit_position, build_num_threshold, additional_criteria,
       send_notification_right_now):
       return False
     return _SendNotificationForCulprit(
         repo_name, revision, commit_position, code_review_url)