Question

我使用Django 1.7 python 2.7。在Django我有几个功能。一个函数准备必要的信息并将其存储在Redis中。之后，另一个函数异步启动多次，从Redis获取信息，计算一些数据并返回给客户端。该功能从浏览器运行，我有下一个错误：

    user_names = json.loads(cache.get(user_id))
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/django_redis/cache.py", line 25, in _decorator
    return method(self, *args, **kwargs)
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/django_redis/cache.py", line 73, in get
    client=client)
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/django_redis/client/default.py", line 215, in get
    value = client.get(key)
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/redis/client.py", line 863, in get
    return self.execute_command('GET', name)
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/redis/client.py", line 565, in execute_command
    return self.parse_response(connection, command_name, **options)
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/redis/client.py", line 577, in parse_response
    response = connection.read_response()
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/redis/connection.py", line 569, in read_response
    response = self._parser.read_response()
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/redis/connection.py", line 224, in read_response
    response = self._buffer.readline()
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/redis/connection.py", line 162, in readline
    self._read_from_socket()
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/redis/connection.py", line 120, in _read_from_socket
    data = self._sock.recv(socket_read_size)
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/gevent/_socket2.py", line 253, in recv
    self._wait(self._read_event)
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/gevent/_socket2.py", line 152, in _wait
    self.hub.wait(watcher)
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/gevent/hub.py", line 559, in wait
    result = waiter.get()
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/gevent/hub.py", line 800, in get
    return self.hub.switch()
  File "/home/user/.virtualenvs/Django/local/lib/python2.7/site-packages/gevent/hub.py", line 538, in switch
    return greenlet.switch(self)
LoopExit: ('This operation would block forever', <Hub at 0x7f3b65bb0370 epoll pending=0 ref=0 fileno=27>)

五次执行该功能3-4次，或者可以执行5次。

UPD（添加代码）。我的代码是这样的：

import json
from django.core.serializers.json import DjangoJSONEncoder
from .models import users, reports
from .helpers import FILTERS

KEYS = ['query_1', 'query_2', 'query_3', 'query_4', 'query_5']

def initial_data(request):
    context = {}

    user_names = users.objects.filter(**FILTERS).values_list('user_name', 'user_last_name', 'user_email')
    user_names = {email: {' '.join((name, last_name)) for name, last_name, email in user_names}}

    user_id = str(request.user.id)
    try:
        cache = get_cache('default')
        cache.set(user_id, json.dumps(user_names, cls=DjangoJSONEncoder))
    except:
        context['errors'] = ["Can't get access to the Redis"]
    else:
        context['errors'] = []

    return HttpResponse(json.dumps(context, cls=DjangoJSONEncoder), content_type="application/json")

def data(request):
    context = {}
    key = request.GET['key']
    user_id = str(request.user.id)
    cache = get_cache('default')
    user_names = json.loads(cache.get(user_id))

    if key == 'query_1':
        emails = list(user_names.keys())[0:9]

    if key == 'query_2':
        emails = list(user_names.keys())[10:19]

    if key == 'query_3':
        emails = list(user_names.keys())[20:29]

    if key == 'query_4':
        emails = list(user_names.keys())[30:39]

    if key == 'query_5':
        emails = list(user_names.keys())[40:49]

    result = reports.objects.filter(user_email__in=emails).values_list('date', 'text', 'user_email')
    for date, text, email in result:
        context[email] = [user_names[email], date, text]

    return HttpResponse(json.dumps(context, cls=DjangoJSONEncoder), content_type="application/json")

在函数initial_data中，我从数据库收集用户信息，这是过滤报告并将其存储在Redis中所必需的。富裕知道所有KEYS（＆＃39; query_1＆＃39;，＆＃39; query_2＆＃39;，＆＃39; query_3＆＃39;，＆＃39; query_4＆＃39;，＆＃39; query_5＆＃39;）并且一次一个键地向函数data异步发送请求。

LoopExit：＆＃39;此操作将永久阻止＆＃39;使用Redis作为Django上的缓存

0 个答案: