scrapy_代理使用

pip install scrapy_proxies

# Retry many times since proxies often fail
RETRY_TIMES = 10
# Retry on most error codes since proxies fail for different reasons
RETRY_HTTP_CODES = [500, 503, 504, 400, 403, 404, 408]

DOWNLOADER_MIDDLEWARES = {
    ‘scrapy.downloadermiddlewares.retry.RetryMiddleware‘: 90,
    ‘scrapy_proxies.RandomProxy‘: 100,
    ‘scrapy.downloadermiddlewares.httpproxy.HttpProxyMiddleware‘: 110,
}

# ip文件示例如下
# http://host1:port
# http://username:password@host2:port
# http://host3:port
# 这是存放代理IP列表的位置
PROXY_LIST = ‘/path/to/proxy/list.txt‘

#代理模式
# 0 = 每个请求都有不同的代理
# 1 = 仅从列表中获取一个代理，并将其分配给每个请求
# 2 = 在设置中使用自定义代理
PROXY_MODE = 0

#如果使用模式2，将下面解除注释：
#CUSTOM_PROXY = "http://host1:port"

# -*- coding: utf-8-*-
from scrapy import signals
from Application import redis_conn


class ProxyMiddleware(object):  # 代理
    def __init__(self):
        pass

    @classmethod
    def from_crawler(cls, crawler):
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        ‘‘‘
        更换ip
        :param request:
        :param spider:
        :return:
        ‘‘‘
        proxy_ip = redis_conn.brpoplpush(src=‘proxies‘, dst=‘proxies‘, timeout=3)
        request.meta[‘proxy‘] = proxy_ip
        return None

    def spider_opened(self, spider):
        spider.logger.info(‘Spider opened: %s‘ % spider.name)

    r = redis.Redis(connection_pool=redis.ConnectionPool(
        host="localhost",
        port=6379,
        # password="",
        decode_responses=True,  # 设置为str，不然可能会是bytes
        db=1
    ))

    proxy_list = ["ip1", "ip2"]
    count = 0
    for proxy in proxy_list:
        if not r.sismember(‘proxies_set‘, proxy):
            r.sadd(‘proxies_set‘, proxy)
            r.lpush(‘proxies‘, proxy)
            count += 1
    print(‘代理加入队列成功, 共加入代理:‘ + str(count))