基于redis实现scrapy分布式爬虫

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安装redis

下载

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wget http://download.redis.io/releases/redis-stable.tar.gz

安装

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tar -zxvf redis-stable.tar.gz
cd redis-stable

运行

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./src/redis-server
./src/redis-cli

安装scrapy-redis

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pip install scrapy-redis

新建分布式爬虫

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新建项目

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scrapy startproject distributedspider

新建redis crawler(mycrawler_redis.py)

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import redis
from scrapy.spiders import Rule
from scrapy.linkextractors import LinkExtractor
from scrapy_redis.spiders import RedisCrawlSpider

class MyCrawler(RedisCrawlSpider):
    """Spider that reads urls from redis queue (myspider:start_urls)."""
    name = 'mycrawler_redis'
    redis_key = 'mycrawler:start_urls'
    start_urls = []

    def __init__(self, *args, **kwargs):
        super(MyCrawler, self).__init__(*args, **kwargs)
        # Dynamically define the allowed domains list.
        domain = kwargs.pop('domain', '')
        self.allowed_domains = filter(None, domain.split(','))
        self.start_urls.append('http://joke.4399pk.com/funnyimg/find-cate-2.html')

        r = redis.Redis()
        for pageNum in range(1, 20, 1):
            pageUrl = 'http://joke.4399pk.com/funnyimg/find-cate-2-p-' + str(pageNum) + '.html'
            start_urls_len = r.lpush("myspider:start_urls", pageUrl)
            print 'start_urls_len:' + str(start_urls_len)

新建redis spider(myspider_redis.py)

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from scrapy_redis.spiders import RedisSpider

class MySpider(RedisSpider):
    """Spider that reads urls from redis queue (myspider:start_urls)."""
    name = 'myspider_redis'
    redis_key = 'myspider:start_urls'

    def __init__(self, *args, **kwargs):
        # Dynamically define the allowed domains list.
        domain = kwargs.pop('domain', '')
        self.allowed_domains = filter(None, domain.split(','))

        super(MySpider, self).__init__(*args, **kwargs)

    def parse(self, response):
        print 'spider_____________'
        print response.url

        return {
            'name': response.css('title::text').extract_first(),
            'url': response.url,
        }

修改配置（settings.pyc）

配置redis地址，多机部署时队列读取地址。

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DUPEFILTER_CLASS = "scrapy_redis.dupefilter.RFPDupeFilter"
SCHEDULER = "scrapy_redis.scheduler.Scheduler"

ITEM_PIPELINES = {
    'distributedspider.pipelines.DistributedspiderPipeline': 300,
    'scrapy_redis.pipelines.RedisPipeline': 400,
}

REDIS_HOST = '127.0.0.1'
REDIS_PORT = 6379

运行

启动redis

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运行spider1

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运行spider2

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添加start_urls

方式一（手动添加）：
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方式二（执行脚本添加）：

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scrapy crawl mycrawler_redis

结论

可以看到spider1、spider2在并行处理请求

20190907082524.png

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来源：http://leunggeorge.github.io/

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