Python GAE上的gmailapi：正确使用discovery.build_from_document（）

我在GMail API上运行了许多任务，得到了与中描述的相同的错误。为了解决这个问题，我想实施建议的解决方案。但是，我不知道如何将其应用到我的代码中

我的代码目前如下所示：

class getLatest(webapp2.RequestHandler):
  def post(self):
    try:
      email = self.request.get('email')
      g = Credentials.get_by_id(email)
      REFRESH_TOKEN = g.refresh_token
      start_history_id = g.hid

      credentials = OAuth2Credentials(None, settings.CLIENT_ID,
                         settings.CLIENT_SECRET, REFRESH_TOKEN, None,
                         GOOGLE_TOKEN_URI, None,
                         revoke_uri=GOOGLE_REVOKE_URI,
                         id_token=None,
                         token_response=None)

      http = credentials.authorize(httplib2.Http())
      service = discovery.build("gmail", "v1", http=http)
      for n in range(0, 5): 
        try:
          history = service.users().history().list(userId=email, startHistoryId=start_history_id).execute(http=http)
          break
        except errors.HttpError, e:
          if n < 4:
            time.sleep((2 ** n) + random.randint(0, 1000) / 1000)
          else:
            raise
      changes = history['history'] if 'history' in history else []
      while 'nextPageToken' in history:
        page_token = history['nextPageToken']
        for n in range(0, 5): 
          try:
            history = service.users().history().list(userId=email, startHistoryId=start_history_id, pageToken=page_token).execute(http=http)
            break
          except errors.HttpError, e:
            if n < 4:
              time.sleep((2 ** n) + random.randint(0, 1000) / 1000)
            else:
              raise
        changes.extend(history['history'])

    except errors.HttpError, error:
        logging.exception('An error occurred: '+str(error))
        if error.resp.status == 401:
            # Credentials have been revoked.
            # TODO: Redirect the user to the authorization URL.
            raise NotImplementedError()
        else:
            stacktrace = traceback.format_exc()
            logging.exception('%s', stacktrace)

然后将内容的值保存到数据存储中。该问题解释了这不是用户绑定的，但是我不清楚是否应该运行一次并将值存储到永恒，或者在特定时间刷新它

此外，由于我处理授权的方式有点不同，我觉得如果我以完全相同的方式实现它，我也会遇到问题。因为当我构建服务时，我实际上会在调用中添加凭据：

http = credentials.authorize(httplib2.Http())
service = discovery.build("gmail", "v1", http=http)

---

事实证明，这是非常直截了当的。我添加了以下功能：

def get_discovery_content():
  content = memcache.get('gmail_discovery')
  if content is not None:
    return content
  else:
    h = httplib2.Http()
    for n in range(0, 5):
      resp, content = h.request('https://www.googleapis.com/discovery/v1/apis/gmail/v1/rest?quotaUser=replimeapp')
      if resp.status == 200:
        memcache.add('gmail_discovery', content, 86400)
        return content  

然后我替换了这一行：

service = discovery.build("gmail", "v1", http=http)

据此：

content = get_discovery_content()
service = discovery.build_from_document(content)

到目前为止，它很有魅力

content = get_discovery_content()
service = discovery.build_from_document(content)