memcache가 예상대로 작동하지 않습니다.

Question

우리는 Python으로 Google App Engine을위한 작은 애플리케이션을 보유하고 있으며 memcache를 사용하고 있습니다. 그러나 memcache 열쇠는 memcache.delete 후에도 남아 있고 memcache는 문자열 ("정의되지 않음")을 반환 할 때 숫자 (0)을 반환합니다.

check_feature.py :이

import sys 
sys.path.insert(0, 'libs') 

import webapp2 
import json 
from google.appengine.api import memcache 
from models.shard_counter import GeneralCounterShard 
from models.check_feature_limit import CheckFeatureLimit 


class CheckFeatureHandler(webapp2.RequestHandler): 
    def get_number_of_users_enabled(self, feature_name): 
     """ 
     Get the number of users enabled for the given feature name. 
     """ 
     number_of_users_enabled_undefined = "undefined" 
     number_of_users_enabled = memcache.get(key=feature_name) 
     if (number_of_users_enabled is None): 
      check_feature_limit = None 
      check_feature_limits = CheckFeatureLimit.gql("WHERE feature_name=:1 ORDER BY last_modified DESC LIMIT 1", feature_name) 
      if (check_feature_limits.count() > 0): 
       check_feature_limit = check_feature_limits.get() 
      if (check_feature_limit): 
       number_of_users_enabled = check_feature_limit.number_of_users_enabled 
      if (number_of_users_enabled is None): 
       number_of_users_enabled = number_of_users_enabled_undefined 
      memcache.add(key=feature_name, value=number_of_users_enabled, time=3600) 
     if (number_of_users_enabled == number_of_users_enabled_undefined): 
      number_of_users_enabled = None 
     return number_of_users_enabled 

admin.py :

import sys 
sys.path.insert(0, 'libs') 

import webapp2 
import json 
import requests 
from google.appengine.ext.webapp import template 
from google.appengine.api import memcache 
from models.shard_counter import GeneralCounterShard 
from models.check_feature_limit import CheckFeatureLimit 

template.register_template_library("tags.tags") 


class AdminHandler(webapp2.RequestHandler): 
    def get(self): 
     self.post() 

    def post(self): 
     params = {} 
     number_of_users_enabled_dict = {} 
     number_of_users_dict = {} 
     r = requests.get(url="http://jsons.[part_of_link_suppressed].com.s3.amazonaws.com/flags.json") 
     flags = json.loads(r.text) 
     if ((flags) and ("depending_on_counter" in flags) and (len(flags["depending_on_counter"]) > 0)): 
      for feature_name in flags["depending_on_counter"]: 
       check_feature_limit = None 
       check_feature_limits = CheckFeatureLimit.gql("WHERE feature_name=:1 ORDER BY last_modified DESC LIMIT 1", feature_name) 
       if (check_feature_limits.count() > 0): 
        check_feature_limit = check_feature_limits.get() 
       number_of_users_enabled = self.request.get(feature_name + "_number_of_users_enabled") 
       if (number_of_users_enabled): 
        number_of_users_enabled = int(number_of_users_enabled) 
        if (not(check_feature_limit)): 
         check_feature_limit = CheckFeatureLimit(feature_name=feature_name) 
        check_feature_limit.number_of_users_enabled = number_of_users_enabled 
        check_feature_limit.put() 
        memcache.delete(key=feature_name) # I don't think it works. 
       number_of_users_enabled = None 
       if (check_feature_limit): 
        number_of_users_enabled = check_feature_limit.number_of_users_enabled 
       if (not(number_of_users_enabled is None)): 
        number_of_users_enabled_dict[feature_name] = number_of_users_enabled 
       number_of_users = GeneralCounterShard.get_count(feature_name) 
       number_of_users_dict[feature_name] = number_of_users 
      params["depending_on_counter"] = flags["depending_on_counter"] 
      params["number_of_users_enabled_dict"] = number_of_users_enabled_dict 
      params["number_of_users_dict"] = number_of_users_dict 
     html = template.render("admin/admin.html", params) 
     self.response.out.write(html) 

app = webapp2.WSGIApplication([ 
    ("/admin", AdminHandler) 
], debug=True) 

test_counter_feature_1의 값을 (수 있도록 사용자의 수) 2, test_counter_feature_2 여기 내 코드입니다 test_counter_feature_3은 정의되지 않았지만 (객체가 없음), 양식을 저장 한 후에도 memcache의 값은 각각 2, 3 및 0입니다 (따라서 memcache shoul d 삭제됨). 문제가 무엇입니까? test_counter_feature_3의 값은 0이 아니라 "undefined"가 될 것으로 기대합니다. 그리고 두 개의 다른 값은 양식을 저장 한 후에 삭제해야합니다.

Answer 1

확인을 클릭하면 문제가 발견되었습니다. GeneralCounterShard도 memcache에 동일한 키를 저장 했으므로 키의 이름을 변경하면 모든 것이 작동합니다. 새 키는 전에 있던 feature_name 대신 feature_name + "_number_of_users_enabled"입니다. 그래서 memcache에 대한 모든 호출을 새로운 키로 바꿨고 이제는 작동합니다. 고맙습니다!