[Findit] Make Findit more robust.

tools/findit/common/http_client_local.py

 # Copyright (c) 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.
 
 """
 A http client with support for https connections with certificate verification.
 
 The verification is based on http://tools.ietf.org/html/rfc6125#section-6.4.3
 and the code is from Lib/ssl.py in python3:
   http://hg.python.org/cpython/file/4dac45f88d45/Lib/ssl.py
 
 One use case is to download Chromium DEPS file in a secure way:
   https://src.chromium.org/chrome/trunk/src/DEPS
 
 Notice: python 2.7 or newer is required.
 """
 
 import cookielib
 import httplib
 import os
 import re
 import socket
 import ssl
+import time
 import urllib
 import urllib2
 
 import http_client
 
 
 _SCRIPT_DIR = os.path.dirname(__file__)
 _TRUSTED_ROOT_CERTS = os.path.join(_SCRIPT_DIR, 'cacert.pem')
 
 
@@ skipping 184 matching lines @@
     status_code = e.code
     content = None
 
   return status_code, content
 
 
 class HttpClientLocal(http_client.HttpClient):
   """This http client is used locally in a workstation, GCE VMs, etc."""
 
   @staticmethod
-  def Get(url, params={}, timeout=None):
+  def Get(url, params={}, timeout=60, retries=5, retry_interval=0.5,
+          retry_if_not=None):
     if params:
       url = '%s?%s' % (url, urllib.urlencode(params))
-    return _SendRequest(url, timeout=timeout)
+
+    count = 0
+    while True:
+      count += 1
+
+      status_code, content = _SendRequest(url, timeout=timeout)
+      if status_code == 200:
+        return status_code, content
+      if retry_if_not and status_code == retry_if_not:
+        return status_code, content
+
+      if count < retries:
+        time.sleep(retry_interval)
+      else:
+        return status_code, content
+
+    # Should never be reached.
+    return status_code, content