def test_proxies(cycle=VALID_CHECK_CYCLE):
"""
检查代理队列左半边(旧的)队列的代理有效性，无效的剔除，有效的重新放入队列右侧
:param cycle: 检测周期
"""
conn = RedisClient()
tester = ValidityTester()
while True:
print('testing & refreshing ips...')
count = int(0.5 * conn.list_len)
if count == 0:
print('0 ip, waiting for adding...')
time.sleep(cycle)
continue
raw_proxies = conn.get_for_test(count) #从数据库中获取ip进行测试
tester.set_raw_proxies(raw_proxies)
tester.test()
time.sleep(cycle)
