import time

from django.utils.deprecation import MiddlewareMixin

MAX_REQUEST_PER_SECOND=2 #每秒访问次数

class RequestBlockingMiddleware(MiddlewareMixin):

  def process_request(self,request):
    now=time.time()
    request_queue = request.session.get('request_queue',[])
    if len(request_queue) < MAX_REQUEST_PER_SECOND:
      request_queue.append(now)
      request.session['request_queue']=request_queue
    else:
      time0=request_queue[0]
      if (now-time0)<1:
        time.sleep(5)

      request_queue.append(time.time())
      request.session['request_queue']=request_queue[1:]

MIDDLEWARE = [
  'django.middleware.security.SecurityMiddleware',
  'django.contrib.sessions.middleware.SessionMiddleware',
  'django.middleware.common.CommonMiddleware',
  'django.middleware.csrf.CsrfViewMiddleware',
  'common.middleware.RequestBlockingMiddleware', #在sessions之后，auth之前
  'django.contrib.auth.middleware.AuthenticationMiddleware',
  'django.contrib.messages.middleware.MessageMiddleware',
  'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

REST_FRAMEWORK = {
'DEFAULT_PARSER_CLASSES': (
'rest_framework.parsers.JSONParser',
'rest_framework.parsers.FormParser',
'rest_framework.parsers.MultiPartParser',
),

'DEFAULT_AUTHENTICATION_CLASSES': (
# 'lecare.core.rest_auth.CrossSiteSessionAuthentication',
),

'DEFAULT_PERMISSION_CLASSES': [
# 'rest_framework.permissions.IsAuthenticated',
'rest_framework.permissions.AllowAny',
],

'PAGE_SIZE': 20,
'UNICODE_JSON': False,
# 'COERCE_DECIMAL_TO_STRING': False,
# 'EXCEPTION_HANDLER': 'lecare.core.custom_exception_handler.custom_exception_handler',
'JWT_EXPIRATION_DELTA': datetime.timedelta(hours = 2),
'JWT_REFRESH_EXPIRATION_DELTA': datetime.timedelta(days = 360),
'JWT_ALLOW_REFRESH': False,
'JWT_AUTH_HEADER_PREFIX': 'JWT',
'JWT_PAYLOAD_HANDLER': 'consumer.jwt_conf.jwt_payload_handler',
'JWT_RESPONSE_PAYLOAD_HANDLER': 'consumer.jwt_conf.jwt_response_payload_handler',
'JWT_GET_USER_SECRET_KEY': 'consumer.jwt_conf.jwt_get_secret_key',
# 'DEFAULT_THROTTLE_CLASSES': (
# # 开启匿名用户接口请求频率限制
# 'rest_framework.throttling.AnonRateThrottle',
# # 开启授权用户接口请求频率限制
# 'rest_framework.throttling.UserRateThrottle'
# ),
# 'DEFAULT_THROTTLE_RATES': {
# # 频率限制有second, minute, hour, day
# # 匿名用户请求频率
# 'anon': '30/second',
# # 授权用户请求频率
# 'user': '30/second'
# }
}