add login limit

+LOGIN_TIMES_LIMIT = 100
+LOGIN_TIMES_LIMIT_EXPIRES = 3600 * 24
+

 from common.mixins import GenericView
+from rest_framework import status
 from rest_framework_jwt.views import ObtainJSONWebToken
 from common import response
+from common.redis_cache import redis_handler as rh
+from .consts import LOGIN_TIMES_LIMIT_EXPIRES, LOGIN_TIMES_LIMIT
 
 # Create your views here.
 
@@ -8,17 +11,22 @@ from common import response
 class LoginView(ObtainJSONWebToken, GenericView):
 
     def post(self, request, *args, **kwargs):
+        user_name = request.data.get('username', '')
+        times = rh.get_login_times(user_name)
+        if isinstance(times, int) and times >= LOGIN_TIMES_LIMIT:
+            raise self.invalid_params(msg="重试次数限制")
+
         res = super(LoginView, self).post(request, *args, **kwargs)
-        self.running_log.info('[users.login] username: %s' % request.data.get('username'))
+        self.running_log.info('[users.login] username: {0}'.format(user_name))
 
-        if res.status_code == 400:
+        if res.status_code == status.HTTP_400_BAD_REQUEST:
+            rh.set_login_times(user_name, LOGIN_TIMES_LIMIT_EXPIRES)
             raise self.invalid_params(msg="用户名或密码错误")
         serializer = self.get_serializer(data=request.data)
-        serializer.is_valid()
+        # serializer.is_valid()
         user = serializer.object.get('user')
-        user_id = user.id
         data = {
-            'user_id': user_id,
+            'user_id': user.id,
             'user_name': user.username,
             'token': res.data.get('token'),
         }

@@ -38,6 +38,7 @@ class RedisHandler:
         self.session_id_key = '{0}:session_id'.format(self.prefix)
         self.cms_token_key = '{0}:cms_token'.format(self.prefix)
         self.ecm_token_key = '{0}:ecm_token'.format(self.prefix)
+        self.login_limit_key = '{0}:login_limit'.format(self.prefix)
 
     def enqueue(self, tasks, is_priority=False):
         # 1
@@ -71,3 +72,14 @@ class RedisHandler:
     def set_ecm_token(self, token, expires=None):
         return self.redis.set(self.ecm_token_key, token, expires)
 
+    def get_login_times(self, user_name):
+        if user_name == '':
+            return None
+        return self.redis.get('{0}:{1}'.format(self.login_limit_key, user_name))
+
+    def set_login_times(self, user_name, expires=None):
+        key = '{0}:{1}'.format(self.login_limit_key, user_name)
+        self.redis.incr(key)
+        if isinstance(expires, int):
+            self.redis.expire(key, expires)
+