Creating a Twitter Robot using Google App Engine (Part 1)

gistfile1.py

class Update(webapp.RequestHandler):
  def get(self):
    botlist = db.GqlQuery('SELECT * FROM Weatherbot ORDER BY zipcode ASC')

    failed = False

    try:
      for bot in botlist:
        tweet = self.get_feed(bot.wundurl)
        payload = {'status' : tweet, 'source' : "tweatherbot"}
        payload = urllib.urlencode(payload)
        base64string = base64.encodestring('%s:%s' % (bot.username, bot.password))[:-1]
        headers = {'Authorization': "Basic %s" % base64string}
        url = 'http://twitter.com/statuses/update.xml'
        result = urlfetch.fetch(url, payload=payload, method=urlfetch.POST, headers=headers)
        bot.lastupdate = datetime.now()
        self.response.out.write(result.content)
    except Exception, detail:
      self.response.out.write('An error occurred while accessing Twitter.\n\nException: %s' % detail)
      failed = True

    if failed == False:
      db.put(botlist)
      self.redirect('/')

  def get_feed(self, url):
    result = urlfetch.fetch(url)
    for line in result.content.splitlines():
      if line.startswith('DESCRIPTION:'):
        return line.replace('DESCRIPTION:', '').replace('\\n', '').strip()

  def get_status(self, id):
    current = urlfetch.fetch('http://twitter.com/statuses/user_timeline/%s.xml' % id)
    for line in current.content.splitlines():
      if line.strip().startswith('<text>'):
        return line.replace('<text>', '').replace('\\n', '').replace('</text>', '').strip()

  def get_updatetime(self, id):
    current = urlfetch.fetch('http://twitter.com/statuses/user_timeline/%s.xml' % id)
    for line in current.content.splitlines():
      if line.strip().startswith('<created_at>'):
        return line.replace('<created_at>', '').replace('\\n', '').replace('</created_at>', '').strip()