tools/omahaproxy.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 """Chrome Version Tool
   7
   8 Scrapes Chrome channel information and prints out the requested nugget of
   9 information.
  10 """
  11
  12 import json
  13 import optparse
  14 import os
  15 import string
  16 import sys
  17 import urllib
  18
  19 URL = 'https://omahaproxy.appspot.com/json'
  20
  21
  22 def main():
  23   try:
  24     data = json.load(urllib.urlopen(URL))
  25   except Exception as e:
  26     print 'Error: could not load %s\n\n%s' % (URL, str(e))
  27     return 1
  28
  29   # Iterate to find out valid values for OS, channel, and field options.
  30   oses = set()
  31   channels = set()
  32   fields = set()
  33
  34   for os_versions in data:
  35     oses.add(os_versions['os'])
  36
  37     for version in os_versions['versions']:
  38       for field in version:
  39         if field == 'channel':
  40           channels.add(version['channel'])
  41         else:
  42           fields.add(field)
  43
  44   oses = sorted(oses)
  45   channels = sorted(channels)
  46   fields = sorted(fields)
  47
  48   # Command line parsing fun begins!
  49   usage = ('%prog [options]\n'
  50            'Print out information about a particular Chrome channel.')
  51   parser = optparse.OptionParser(usage=usage)
  52
  53   parser.add_option('-o', '--os',
  54                     choices=oses,
  55                     default='win',
  56                     help='The operating system of interest: %s '
  57                          '[default: %%default]' % ', '.join(oses))
  58   parser.add_option('-c', '--channel',
  59                     choices=channels,
  60                     default='stable',
  61                     help='The channel of interest: %s '
  62                          '[default: %%default]' % ', '.join(channels))
  63   parser.add_option('-f', '--field',
  64                     choices=fields,
  65                     default='version',
  66                     help='The field of interest: %s '
  67                          '[default: %%default] ' % ', '.join(fields))
  68   (opts, args) = parser.parse_args()
  69
  70   # Print out requested data if available.
  71   for os_versions in data:
  72     if os_versions['os'] != opts.os:
  73       continue
  74
  75     for version in os_versions['versions']:
  76       if version['channel'] != opts.channel:
  77         continue
  78
  79       if opts.field not in version:
  80         continue
  81
  82       print version[opts.field]
  83       return 0
  84
  85   print 'Error: unable to find %s for Chrome %s %s.' % (
  86       opts.field, opts.os, opts.channel)
  87   return 1
  88
  89 if __name__ == '__main__':
  90   sys.exit(main())