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137 lines
3.9 KiB
137 lines
3.9 KiB
# -*- coding: utf-8 -*-
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#
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import time
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from hashlib import md5
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from threading import Thread
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from django.core.cache import cache
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from rest_framework.response import Response
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from common.utils import lazyproperty
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__all__ = ['InterceptMixin', 'AsyncApiMixin']
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class InterceptMixin:
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"""
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Hack默认的dispatch, 让用户可以实现 self.do
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"""
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def dispatch(self, request, *args, **kwargs):
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self.args = args
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self.kwargs = kwargs
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request = self.initialize_request(request, *args, **kwargs)
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self.request = request
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self.headers = self.default_response_headers # deprecate?
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try:
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self.initial(request, *args, **kwargs)
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# Get the appropriate handler method
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if request.method.lower() in self.http_method_names:
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handler = getattr(self, request.method.lower(),
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self.http_method_not_allowed)
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else:
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handler = self.http_method_not_allowed
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response = self.do(handler, request, *args, **kwargs)
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except Exception as exc:
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response = self.handle_exception(exc)
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self.response = self.finalize_response(request, response, *args, **kwargs)
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return self.response
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class AsyncApiMixin(InterceptMixin):
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def get_request_user_id(self):
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user = self.request.user
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if hasattr(user, 'id'):
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return str(user.id)
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return ''
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@lazyproperty
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def async_cache_key(self):
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method = self.request.method
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path = self.get_request_md5()
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user = self.get_request_user_id()
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key = '{}_{}_{}'.format(method, path, user)
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return key
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def get_request_md5(self):
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path = self.request.path
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query = {k: v for k, v in self.request.GET.items()}
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query.pop("_", None)
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query.pop('refresh', None)
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query = "&".join(["{}={}".format(k, v) for k, v in query.items()])
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full_path = "{}?{}".format(path, query)
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return md5(full_path.encode()).hexdigest()
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@lazyproperty
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def initial_data(self):
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data = {
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"status": "running",
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"start_time": time.time(),
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"key": self.async_cache_key,
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}
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return data
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def get_cache_data(self):
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key = self.async_cache_key
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if self.is_need_refresh():
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cache.delete(key)
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return None
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data = cache.get(key)
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return data
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def do(self, handler, *args, **kwargs):
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if not self.is_need_async():
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return handler(*args, **kwargs)
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resp = self.do_async(handler, *args, **kwargs)
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return resp
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def is_need_refresh(self):
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if self.request.GET.get("refresh"):
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return True
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return False
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def is_need_async(self):
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return False
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def do_async(self, handler, *args, **kwargs):
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data = self.get_cache_data()
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if not data:
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t = Thread(
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target=self.do_in_thread,
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args=(handler, *args),
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kwargs=kwargs
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)
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t.start()
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resp = Response(self.initial_data)
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return resp
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status = data.get("status")
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resp = data.get("resp")
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if status == "ok" and resp:
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resp = Response(**resp)
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else:
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resp = Response(data)
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return resp
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def do_in_thread(self, handler, *args, **kwargs):
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key = self.async_cache_key
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data = self.initial_data
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cache.set(key, data, 600)
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try:
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response = handler(*args, **kwargs)
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data["status"] = "ok"
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data["resp"] = {
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"data": response.data,
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"status": response.status_code
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}
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cache.set(key, data, 600)
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except Exception as e:
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data["error"] = str(e)
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data["status"] = "error"
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cache.set(key, data, 600)
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