GAE上的Gmail API：正確使用discovery.build_from_document（）

Question

我在GMail API上運行了許多任務，並且遇到了與this issue中描述的相同的錯誤。要解決它，我想實施建議的解決方案。不過，我不知道如何將其應用於我的代碼。

我的代碼目前看起來如下：

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      # Credentials have been revoked.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) 

現在我應該在時間運行在某一時刻下面的代碼：

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

然後保存該值在數據存儲的內容。這個問題解釋了這不是用戶綁定的，但是我不清楚我是否應該運行一次並將值存儲到永久，或者在某些時候刷新它。

此外，由於我處理授權有點不同，我感覺我會遇到問題，如果我以完全相同的方式實施它。因爲當我建立服務時，我實際上在呼叫中添加憑證：

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

Answer 1

原來，這是非常簡單的。我加了以下功能：

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 

然後我換成這一行：

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

通過這樣的：

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

就像一個魅力至今。