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BETTERZON-58: Basic Functionality with scrapy (#33)
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Crawler/crawler/__init__.py
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Crawler/crawler/__init__.py
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Crawler/crawler/items.py
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Crawler/crawler/items.py
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# Define here the models for your scraped items
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#
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# See documentation in:
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# https://docs.scrapy.org/en/latest/topics/items.html
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import scrapy
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class CrawlerItem(scrapy.Item):
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# define the fields for your item here like:
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# name = scrapy.Field()
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pass
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103
Crawler/crawler/middlewares.py
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Crawler/crawler/middlewares.py
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# Define here the models for your spider middleware
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#
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# See documentation in:
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# https://docs.scrapy.org/en/latest/topics/spider-middleware.html
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from scrapy import signals
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# useful for handling different item types with a single interface
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from itemadapter import is_item, ItemAdapter
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class CrawlerSpiderMiddleware:
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# Not all methods need to be defined. If a method is not defined,
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# scrapy acts as if the spider middleware does not modify the
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# passed objects.
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@classmethod
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def from_crawler(cls, crawler):
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# This method is used by Scrapy to create your spiders.
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s = cls()
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crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
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return s
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def process_spider_input(self, response, spider):
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# Called for each response that goes through the spider
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# middleware and into the spider.
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# Should return None or raise an exception.
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return None
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def process_spider_output(self, response, result, spider):
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# Called with the results returned from the Spider, after
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# it has processed the response.
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# Must return an iterable of Request, or item objects.
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for i in result:
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yield i
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def process_spider_exception(self, response, exception, spider):
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# Called when a spider or process_spider_input() method
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# (from other spider middleware) raises an exception.
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# Should return either None or an iterable of Request or item objects.
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pass
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def process_start_requests(self, start_requests, spider):
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# Called with the start requests of the spider, and works
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# similarly to the process_spider_output() method, except
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# that it doesn’t have a response associated.
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# Must return only requests (not items).
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for r in start_requests:
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yield r
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def spider_opened(self, spider):
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spider.logger.info('Spider opened: %s' % spider.name)
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class CrawlerDownloaderMiddleware:
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# Not all methods need to be defined. If a method is not defined,
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# scrapy acts as if the downloader middleware does not modify the
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# passed objects.
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@classmethod
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def from_crawler(cls, crawler):
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# This method is used by Scrapy to create your spiders.
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s = cls()
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crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
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return s
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def process_request(self, request, spider):
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# Called for each request that goes through the downloader
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# middleware.
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# Must either:
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# - return None: continue processing this request
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# - or return a Response object
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# - or return a Request object
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# - or raise IgnoreRequest: process_exception() methods of
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# installed downloader middleware will be called
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return None
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def process_response(self, request, response, spider):
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# Called with the response returned from the downloader.
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# Must either;
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# - return a Response object
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# - return a Request object
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# - or raise IgnoreRequest
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return response
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def process_exception(self, request, exception, spider):
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# Called when a download handler or a process_request()
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# (from other downloader middleware) raises an exception.
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# Must either:
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# - return None: continue processing this exception
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# - return a Response object: stops process_exception() chain
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# - return a Request object: stops process_exception() chain
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pass
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def spider_opened(self, spider):
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spider.logger.info('Spider opened: %s' % spider.name)
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13
Crawler/crawler/pipelines.py
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Crawler/crawler/pipelines.py
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# Define your item pipelines here
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#
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# Don't forget to add your pipeline to the ITEM_PIPELINES setting
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# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html
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# useful for handling different item types with a single interface
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from itemadapter import ItemAdapter
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class CrawlerPipeline:
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def process_item(self, item, spider):
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return item
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88
Crawler/crawler/settings.py
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Crawler/crawler/settings.py
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# Scrapy settings for crawler project
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#
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# For simplicity, this file contains only settings considered important or
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# commonly used. You can find more settings consulting the documentation:
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#
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# https://docs.scrapy.org/en/latest/topics/settings.html
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# https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
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# https://docs.scrapy.org/en/latest/topics/spider-middleware.html
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BOT_NAME = 'crawler'
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SPIDER_MODULES = ['crawler.spiders']
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NEWSPIDER_MODULE = 'crawler.spiders'
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# Crawl responsibly by identifying yourself (and your website) on the user-agent
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USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36'
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# Obey robots.txt rules
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ROBOTSTXT_OBEY = False
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# Configure maximum concurrent requests performed by Scrapy (default: 16)
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#CONCURRENT_REQUESTS = 32
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# Configure a delay for requests for the same website (default: 0)
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# See https://docs.scrapy.org/en/latest/topics/settings.html#download-delay
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# See also autothrottle settings and docs
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DOWNLOAD_DELAY = 3
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# The download delay setting will honor only one of:
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#CONCURRENT_REQUESTS_PER_DOMAIN = 16
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CONCURRENT_REQUESTS_PER_IP = 1
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# Disable cookies (enabled by default)
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COOKIES_ENABLED = False
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# Disable Telnet Console (enabled by default)
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#TELNETCONSOLE_ENABLED = False
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# Override the default request headers:
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#DEFAULT_REQUEST_HEADERS = {
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# 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
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# 'Accept-Language': 'en',
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#}
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# Enable or disable spider middlewares
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# See https://docs.scrapy.org/en/latest/topics/spider-middleware.html
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#SPIDER_MIDDLEWARES = {
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# 'crawler.middlewares.CrawlerSpiderMiddleware': 543,
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#}
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# Enable or disable downloader middlewares
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# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
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#DOWNLOADER_MIDDLEWARES = {
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# 'crawler.middlewares.CrawlerDownloaderMiddleware': 543,
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#}
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# Enable or disable extensions
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# See https://docs.scrapy.org/en/latest/topics/extensions.html
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#EXTENSIONS = {
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# 'scrapy.extensions.telnet.TelnetConsole': None,
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#}
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# Configure item pipelines
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# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
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#ITEM_PIPELINES = {
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# 'crawler.pipelines.CrawlerPipeline': 300,
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#}
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# Enable and configure the AutoThrottle extension (disabled by default)
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# See https://docs.scrapy.org/en/latest/topics/autothrottle.html
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AUTOTHROTTLE_ENABLED = True
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# The initial download delay
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AUTOTHROTTLE_START_DELAY = 5
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# The maximum download delay to be set in case of high latencies
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#AUTOTHROTTLE_MAX_DELAY = 60
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# The average number of requests Scrapy should be sending in parallel to
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# each remote server
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#AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
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# Enable showing throttling stats for every response received:
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#AUTOTHROTTLE_DEBUG = False
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# Enable and configure HTTP caching (disabled by default)
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# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
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#HTTPCACHE_ENABLED = True
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#HTTPCACHE_EXPIRATION_SECS = 0
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#HTTPCACHE_DIR = 'httpcache'
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#HTTPCACHE_IGNORE_HTTP_CODES = []
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#HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'
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4
Crawler/crawler/spiders/__init__.py
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Crawler/crawler/spiders/__init__.py
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# This package will contain the spiders of your Scrapy project
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#
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# Please refer to the documentation for information on how to create and manage
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# your spiders.
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Crawler/crawler/spiders/amazon.py
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Crawler/crawler/spiders/amazon.py
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# -*- coding: utf-8 -*-
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import scrapy
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from urllib.parse import urlencode
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from urllib.parse import urljoin
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import re
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import json
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queries = ['iphone']
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API = ''
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def get_url(url):
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payload = {'api_key': API, 'url': url, 'country_code': 'us'}
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proxy_url = 'http://api.scraperapi.com/?' + urlencode(payload)
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return proxy_url
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class AmazonSpider(scrapy.Spider):
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name = 'amazon'
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def start_requests(self):
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for query in queries:
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url = 'https://www.amazon.de/s?' + urlencode({'k': query})
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yield scrapy.Request(url=url, callback=self.parse_keyword_response)
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def parse_keyword_response(self, response):
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products = response.xpath('//*[@data-asin]')
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for product in products:
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asin = product.xpath('@data-asin').extract_first()
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product_url = f"https://www.amazon.de/dp/{asin}"
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yield scrapy.Request(url=product_url, callback=self.parse_product_page, meta={'asin': asin})
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next_page = response.xpath('//li[@class="a-last"]/a/@href').extract_first()
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if next_page:
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url = urljoin("https://www.amazon.de", next_page)
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yield scrapy.Request(url=url, callback=self.parse_keyword_response)
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def parse_product_page(self, response):
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asin = response.meta['asin']
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title = response.xpath('//*[@id="productTitle"]/text()').extract_first()
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image = re.search('"large":"(.*?)"', response.text).groups()[0]
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rating = response.xpath('//*[@id="acrPopover"]/@title').extract_first()
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number_of_reviews = response.xpath('//*[@id="acrCustomerReviewText"]/text()').extract_first()
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price = response.xpath('//*[@id="priceblock_ourprice"]/text()').extract_first()
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if not price:
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price = response.xpath('//*[@data-asin-price]/@data-asin-price').extract_first() or \
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response.xpath('//*[@id="price_inside_buybox"]/text()').extract_first()
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temp = response.xpath('//*[@id="twister"]')
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sizes = []
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colors = []
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if temp:
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s = re.search('"variationValues" : ({.*})', response.text).groups()[0]
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json_acceptable = s.replace("'", "\"")
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di = json.loads(json_acceptable)
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sizes = di.get('size_name', [])
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colors = di.get('color_name', [])
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bullet_points = response.xpath('//*[@id="feature-bullets"]//li/span/text()').extract()
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seller_rank = response.xpath(
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'//*[text()="Amazon Best Sellers Rank:"]/parent::*//text()[not(parent::style)]').extract()
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yield {'asin': asin, 'Title': title, 'MainImage': image, 'Rating': rating, 'NumberOfReviews': number_of_reviews,
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'Price': price, 'AvailableSizes': sizes, 'AvailableColors': colors, 'BulletPoints': bullet_points,
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'SellerRank': seller_rank}
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@ -2,3 +2,4 @@ pymysql
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flask
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flask-sqlalchemy
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flask_restful
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scrapy
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11
Crawler/scrapy.cfg
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Crawler/scrapy.cfg
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# Automatically created by: scrapy startproject
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#
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# For more information about the [deploy] section see:
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# https://scrapyd.readthedocs.io/en/latest/deploy.html
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[settings]
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default = crawler.settings
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[deploy]
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#url = http://localhost:6800/
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project = crawler
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