make buildbot_globals.py read global_variables.json file from googlesource

tools/buildbot_globals.py

 #!/usr/bin/python

[epoger, 2014/05/16 18:37:42]

tested:

$ tools/buildbot_globals.py android_master_host
108.170.220.21

 
 # Copyright (c) 2013 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.
 
 """
 Provides read access to buildbot's global_variables.json .
 """
 
 
 from contextlib import closing
 
 import HTMLParser
+import base64
 import json
 import re
 import svn
 import sys
 import urllib2
 
 
 _global_vars = None
 
 
-GLOBAL_VARS_JSON_URL = ('http://skia-tree-status.appspot.com/repo-serving/'
-                        'buildbot/site_config/global_variables.json')
+_GLOBAL_VARS_JSON_BASE64_URL = (
+    'https://skia.googlesource.com/buildbot/+/master/'
+    'site_config/global_variables.json?format=TEXT')
 
 
 class GlobalVarsRetrievalError(Exception):
   """Exception which is raised when the global_variables.json file cannot be
   retrieved from the Skia buildbot repository."""
   pass
 
 
 class JsonDecodeError(Exception):
   """Exception which is raised when the global_variables.json file cannot be
   interpreted as JSON. This may be due to the file itself being incorrectly
   formatted or due to an incomplete or corrupted downloaded version of the file.
   """
   pass
 
 
 class NoSuchGlobalVariable(KeyError):
   """Exception which is raised when a given variable is not found in the
   global_variables.json file."""
   pass
 
 
-def retrieve_from_mirror(url):
-  """Retrieve the given file from the Skia Buildbot repo mirror.
-
-  Args:
-      url: string; the URL of the file to retrieve.
-  Returns:
-      The contents of the file in the repository.
-  """
-  with closing(urllib2.urlopen(url)) as f:
-    return f.read()
-
-
 def Get(var_name):
   """Return the value associated with this name in global_variables.json.
-  
+
   Args:
       var_name: string; the variable to look up.
   Returns:
       The value of the variable.
   Raises:
       NoSuchGlobalVariable if there is no variable with that name.
   """
   global _global_vars
   if not _global_vars:
     try:
-      global_vars_text = retrieve_from_mirror(GLOBAL_VARS_JSON_URL)
+      with closing(urllib2.urlopen(_GLOBAL_VARS_JSON_BASE64_URL)) as f:
+        global_vars_text = base64.b64decode(f.read())
     except Exception as e:
       raise GlobalVarsRetrievalError('Failed to retrieve %s:\n%s' %
-                                     (GLOBAL_VARS_JSON_URL, str(e)))
+                                     (_GLOBAL_VARS_JSON_BASE64_URL, str(e)))
     try:
       _global_vars = json.loads(global_vars_text)
     except ValueError as e:
       raise JsonDecodeError(e.message + '\n' + global_vars_text)
   try:
     return _global_vars[var_name]['value']
   except KeyError:
     raise NoSuchGlobalVariable(var_name)
 
 
 if __name__ == '__main__':
   print Get(sys.argv[1])