GAE 上的 Gmail API：正确使用 discovery.build_from_document()

Question

我在 GMail API 上 运行 执行多项任务，但遇到了与 this issue 中所述相同的错误。要解决它，我想实施建议的解决方案。但是我不确定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            # Credentials have been revoked.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)

现在我应该 运行 在某个时刻遵循代码：

resp, content = h.request('https://www.googleapis.com/discovery/v1/apis/analytics/v3/rest?quotaUser=the_name_of_your_app_goes_here')

然后将内容的值保存在数据存储中。这个问题解释说这不是用户绑定的，但是我不清楚我是否应该 运行 这一次并将值存储到永恒，或者在某些时刻及时刷新它。

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施授权，我也会 运行 解决那里的问题。因为当我构建服务时，我实际上在调用中添加了凭据：

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

Answer 1

事实证明这很简单。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)

由此:

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

到目前为止效果很好。