#（1）取出访问者ip
# （2）判断当前ip不在访问字典里，添加进去，并且直接返回True,表示第一次访问，在字典里，继续往下走
# （3）循环判断当前ip的列表，有值，并且当前时间减去列表的最后一个时间大于60s，把这种数据pop掉，这样列表中只有60s以内的访问时间，
# （4）判断，当列表小于3，说明一分钟以内访问不足三次，把当前时间插入到列表第一个位置，返回True，顺利通过
# （5）当大于等于3，说明一分钟内访问超过三次，返回False验证失败

from rest_framework.views import  APIView
from rest_framework.response import  Response
from rest_framework.throttling import SimpleRateThrottle,BaseThrottle
#第一步，写一个频率类，继承SimpleRateThrottle#重写get_cache_key，返回self.get_ident(request)#一定要记住配置一个scop=字符串
# 第二步：在setting中配置# REST_FRAMEWORK = {#
    #     'DEFAULT_THROTTLE_RATES':{#         'lxx':'3/m'#     }# }class Throttle(SimpleRateThrottle):scope = 'lxx'def get_cache_key(self, request, view):# return request.META.get('REMOTE_ADDR')#返回什么值，就以什么做过滤，返回用户id，就以用户id做过滤return self.get_ident(request)#自定义频率类
class MyThrottle(BaseThrottle):VISIT_RECORD = {}def __init__(self):self.history=Nonedef allow_request(self,request,view):#自定义控制每分钟访问多少次，运行访问返回true，不允许访问返回false# （1）取出访问者ip{ip1:[第二次访问时间，第一次访问时间],ip2:[]}# （2）判断当前ip不在访问字典里，如果不在添加进去，并且直接返回True,表示第一次访问，在字典里，继续往下走# （3）循环判断当前ip的列表，有值，并且当前时间减去列表的最后一个时间大于60s，把这种数据pop掉，这样列表中只有60s以内的访问时间，# （4）判断，当列表小于3，说明一分钟以内访问不足三次，把当前时间插入到列表第一个位置，返回True，顺利通过# （5）当大于等于3，说明一分钟内访问超过三次，返回False验证失败# （1）取出访问者ip# print(request.META)#取出访问者ipip = request.META.get('REMOTE_ADDR')import time#拿到当前时间ctime = time.time()# （2）判断当前ip不在访问字典里，添加进去，并且直接返回True,表示第一次访问if ip not in self.VISIT_RECORD:self.VISIT_RECORD[ip] = [ctime, ]return True#是个当前访问者ip对应的时间列表 [第一次访问的时间，]self.history = self.VISIT_RECORD.get(ip)# （3）循环判断当前ip的列表，有值，并且当前时间减去列表的最后一个时间大于60s，把这种数据pop掉，这样列表中只有60s以内的访问时间，while self.history and ctime - self.history[-1] > 60:self.history.pop()# （4）判断，当列表小于3，说明一分钟以内访问不足三次，把当前时间插入到列表第一个位置，返回True，顺利通过# （5）当大于等于3，说明一分钟内访问超过三次，返回False验证失败if len(self.history) < 3:self.history.insert(0, ctime)return Trueelse:return False

def wait(self):import timectime = time.time()return 60 - (ctime - self.history[-1])class Books(APIView):# throttle_classes=[Throttle,]

　　#局部使用throttle_classes=[MyThrottle,]

def get(self,request):return Response('')

REST_FRAMEWORK = {'DEFAULT_THROTTLE_RATES':{'lxx':'3/minute'}
}

REST_FRAMEWORK = {'DEFAULT_THROTTLE_CLASSES':['自定义频率的方法的路径',],'DEFAULT_THROTTLE_RATES':{'luffy':'3/m'}
}

 def check_throttles(self, request):"""Check if request should be throttled.Raises an appropriate exception if the request is throttled."""for throttle in self.get_throttles():if not throttle.allow_request(request, self):self.throttled(request, throttle.wait())#以及错误信息的源码
class Throttled(APIException):status_code = status.HTTP_429_TOO_MANY_REQUESTSdefault_detail = _('Request was throttled.')extra_detail_singular = 'Expected available in {wait} second.'extra_detail_plural = 'Expected available in {wait} seconds.'default_code = 'throttled'

class Course(APIView):authentication_classes = [TokenAuth, ]permission_classes = [UserPermission, ]throttle_classes = [MyThrottles,]def get(self, request):return HttpResponse('get')def post(self, request):return HttpResponse('post')def throttled(self, request, wait):#自定义中文的错误信息from rest_framework.exceptions import Throttledclass MyThrottled(Throttled):default_detail = '傻逼啊'extra_detail_singular = '还有 {wait} second.'extra_detail_plural = '出了 {wait} seconds.'raise MyThrottled(wait)

class SimpleRateThrottle(BaseThrottle):# 咱自己写的放在了全局变量，他的在django的缓存中cache = default_cache# 获取当前时间，跟咱写的一样timer = time.time# 做了一个字符串格式化，cache_format = 'throttle_%(scope)s_%(ident)s'scope = None# 从配置文件中取DEFAULT_THROTTLE_RATES，所以咱配置文件中应该配置，否则报错THROTTLE_RATES = api_settings.DEFAULT_THROTTLE_RATESdef __init__(self):if not getattr(self, 'rate', None):# 从配置文件中找出scope配置的名字对应的值，比如咱写的‘3/m’,他取出来self.rate = self.get_rate()#     解析'3/m',解析成 3      mself.num_requests, self.duration = self.parse_rate(self.rate)# 这个方法需要重写def get_cache_key(self, request, view):"""Should return a unique cache-key which can be used for throttling.Must be overridden.May return `None` if the request should not be throttled."""raise NotImplementedError('.get_cache_key() must be overridden')def get_rate(self):if not getattr(self, 'scope', None):msg = ("You must set either `.scope` or `.rate` for '%s' throttle" %self.__class__.__name__)raise ImproperlyConfigured(msg)try:# 获取在setting里配置的字典中的之，self.scope是 咱写的luffyreturn self.THROTTLE_RATES[self.scope]except KeyError:msg = "No default throttle rate set for '%s' scope" % self.scoperaise ImproperlyConfigured(msg)# 解析 3/m这种传参def parse_rate(self, rate):"""Given the request rate string, return a two tuple of:<allowed number of requests>, <period of time in seconds>"""if rate is None:return (None, None)num, period = rate.split('/')num_requests = int(num)# 只取了第一位，也就是 3/mimmmmmmm也是代表一分钟duration = {'s': 1, 'm': 60, 'h': 3600, 'd': 86400}[period[0]]return (num_requests, duration)# 逻辑跟咱自定义的相同def allow_request(self, request, view):"""Implement the check to see if the request should be throttled.On success calls `throttle_success`.On failure calls `throttle_failure`."""if self.rate is None:return Trueself.key = self.get_cache_key(request, view)if self.key is None:return Trueself.history = self.cache.get(self.key, [])self.now = self.timer()# Drop any requests from the history which have now passed the# throttle durationwhile self.history and self.history[-1] <= self.now - self.duration:self.history.pop()if len(self.history) >= self.num_requests:return self.throttle_failure()return self.throttle_success()# 成功返回true，并且插入到缓存中def throttle_success(self):"""Inserts the current request's timestamp along with the keyinto the cache."""self.history.insert(0, self.now)self.cache.set(self.key, self.history, self.duration)return True# 失败返回falsedef throttle_failure(self):"""Called when a request to the API has failed due to throttling."""return Falsedef wait(self):"""Returns the recommended next request time in seconds."""if self.history:remaining_duration = self.duration - (self.now - self.history[-1])else:remaining_duration = self.durationavailable_requests = self.num_requests - len(self.history) + 1if available_requests <= 0:return Nonereturn remaining_duration / float(available_requests)