Урок 6. Scrapy. Парсинг фото и файлов

.gitignore

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+# Created by .ignore support plugin (hsz.mobi)

scrapy.cfg

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+# Automatically created by: scrapy startproject
+#
+# For more information about the [deploy] section see:
+# https://scrapyd.readthedocs.io/en/latest/deploy.html
+
+[settings]
+default = youlaparser.settings
+
+[deploy]
+#url = http://localhost:6800/
+project = youlaparser

youlaparser/items.py

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+# -*- coding: utf-8 -*-
+
+# Define here the models for your scraped items
+#
+# See documentation in:
+# https://docs.scrapy.org/en/latest/topics/items.html
+
+import scrapy
+
+
+class YoulaparserItem(scrapy.Item):
+    # define the fields for your item here like:
+    _id = scrapy.Field()
+    title = scrapy.Field()
+    link = scrapy.Field()
+    images = scrapy.Field()

youlaparser/middlewares.py

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+# -*- coding: utf-8 -*-
+
+# Define here the models for your spider middleware
+#
+# See documentation in:
+# https://docs.scrapy.org/en/latest/topics/spider-middleware.html
+
+from scrapy import signals
+
+
+class YoulaparserSpiderMiddleware(object):
+    # Not all methods need to be defined. If a method is not defined,
+    # scrapy acts as if the spider middleware does not modify the
+    # passed objects.
+
+    @classmethod
+    def from_crawler(cls, crawler):
+        # This method is used by Scrapy to create your spiders.
+        s = cls()
+        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
+        return s
+
+    def process_spider_input(self, response, spider):
+        # Called for each response that goes through the spider
+        # middleware and into the spider.
+
+        # Should return None or raise an exception.
+        return None
+
+    def process_spider_output(self, response, result, spider):
+        # Called with the results returned from the Spider, after
+        # it has processed the response.
+
+        # Must return an iterable of Request, dict or Item objects.
+        for i in result:
+            yield i
+
+    def process_spider_exception(self, response, exception, spider):
+        # Called when a spider or process_spider_input() method
+        # (from other spider middleware) raises an exception.
+
+        # Should return either None or an iterable of Request, dict
+        # or Item objects.
+        pass
+
+    def process_start_requests(self, start_requests, spider):
+        # Called with the start requests of the spider, and works
+        # similarly to the process_spider_output() method, except
+        # that it doesn’t have a response associated.
+
+        # Must return only requests (not items).
+        for r in start_requests:
+            yield r
+
+    def spider_opened(self, spider):
+        spider.logger.info('Spider opened: %s' % spider.name)
+
+
+class YoulaparserDownloaderMiddleware(object):
+    # Not all methods need to be defined. If a method is not defined,
+    # scrapy acts as if the downloader middleware does not modify the
+    # passed objects.
+
+    @classmethod
+    def from_crawler(cls, crawler):
+        # This method is used by Scrapy to create your spiders.
+        s = cls()
+        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
+        return s
+
+    def process_request(self, request, spider):
+        # Called for each request that goes through the downloader
+        # middleware.
+
+        # Must either:
+        # - return None: continue processing this request
+        # - or return a Response object
+        # - or return a Request object
+        # - or raise IgnoreRequest: process_exception() methods of
+        #   installed downloader middleware will be called
+        return None
+
+    def process_response(self, request, response, spider):
+        # Called with the response returned from the downloader.
+
+        # Must either;
+        # - return a Response object
+        # - return a Request object
+        # - or raise IgnoreRequest
+        return response
+
+    def process_exception(self, request, exception, spider):
+        # Called when a download handler or a process_request()
+        # (from other downloader middleware) raises an exception.
+
+        # Must either:
+        # - return None: continue processing this exception
+        # - return a Response object: stops process_exception() chain
+        # - return a Request object: stops process_exception() chain
+        pass
+
+    def spider_opened(self, spider):
+        spider.logger.info('Spider opened: %s' % spider.name)

youlaparser/pipelines.py

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+# -*- coding: utf-8 -*-
+
+# Define your item pipelines here
+#
+# Don't forget to add your pipeline to the ITEM_PIPELINES setting
+# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html
+
+import scrapy
+from pymongo import MongoClient
+from scrapy.pipelines.images import ImagesPipeline
+
+
+class YoulaparserPipeline(object):
+    def __init__(self):
+        client = MongoClient('localhost', 27017)
+        self.db = client['scrapy_files_DB']
+
+    def process_item(self, item, spider):
+        collection = self.db[spider.name]
+        collection.insert_one(item)
+        return item
+
+
+class YoulaImagesPipeline(ImagesPipeline):
+    def get_media_requests(self, item, info):
+        if item['images']:
+            for img in item['images']:
+                try:
+                    yield scrapy.Request(img)
+                except Exception as e:
+                    print(e)
+
+    def item_completed(self, results, item, info):
+        if results:
+            item['images'] = [img[1] for img in results if img[0]]
+        return item

youlaparser/runner.py

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+from scrapy.crawler import CrawlerProcess
+from scrapy.settings import Settings
+from youlaparser import settings
+from youlaparser.spiders.youla import YoulaSpider
+
+
+if __name__ == '__main__':
+    crawler_settings = Settings()
+    crawler_settings.setmodule(settings)
+
+    process = CrawlerProcess(settings=crawler_settings)
+    process.crawl(YoulaSpider)
+    process.start()

youlaparser/settings.py

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+# -*- coding: utf-8 -*-
+
+# Scrapy settings for youlaparser project
+#
+# For simplicity, this file contains only settings considered important or
+# commonly used. You can find more settings consulting the documentation:
+#
+#     https://docs.scrapy.org/en/latest/topics/settings.html
+#     https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
+#     https://docs.scrapy.org/en/latest/topics/spider-middleware.html
+
+BOT_NAME = 'youlaparser'
+
+SPIDER_MODULES = ['youlaparser.spiders']
+NEWSPIDER_MODULE = 'youlaparser.spiders'
+
+LOG_ENABLED = True
+LOG_LEVEL = 'DEBUG'
+
+IMAGES_STORE = 'images'
+
+# Crawl responsibly by identifying yourself (and your website) on the user-agent
+USER_AGENT = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36'
+
+# Obey robots.txt rules
+ROBOTSTXT_OBEY = False
+
+# Configure maximum concurrent requests performed by Scrapy (default: 16)
+CONCURRENT_REQUESTS = 8
+
+# Configure a delay for requests for the same website (default: 0)
+# See https://docs.scrapy.org/en/latest/topics/settings.html#download-delay
+# See also autothrottle settings and docs
+DOWNLOAD_DELAY = 3
+# The download delay setting will honor only one of:
+CONCURRENT_REQUESTS_PER_DOMAIN = 8
+CONCURRENT_REQUESTS_PER_IP = 8
+
+# Disable cookies (enabled by default)
+COOKIES_ENABLED = False
+
+# Disable Telnet Console (enabled by default)
+#TELNETCONSOLE_ENABLED = False
+
+# Override the default request headers:
+#DEFAULT_REQUEST_HEADERS = {
+#   'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
+#   'Accept-Language': 'en',
+#}
+
+# Enable or disable spider middlewares
+# See https://docs.scrapy.org/en/latest/topics/spider-middleware.html
+#SPIDER_MIDDLEWARES = {
+#    'youlaparser.middlewares.YoulaparserSpiderMiddleware': 543,
+#}
+
+# Enable or disable downloader middlewares
+# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
+#DOWNLOADER_MIDDLEWARES = {
+#    'youlaparser.middlewares.YoulaparserDownloaderMiddleware': 543,
+#}
+
+# Enable or disable extensions
+# See https://docs.scrapy.org/en/latest/topics/extensions.html
+#EXTENSIONS = {
+#    'scrapy.extensions.telnet.TelnetConsole': None,
+#}
+
+# Configure item pipelines
+# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
+ITEM_PIPELINES = {
+   'youlaparser.pipelines.YoulaparserPipeline': 300,
+   'youlaparser.pipelines.YoulaImagesPipeline': 100,
+}
+
+# Enable and configure the AutoThrottle extension (disabled by default)
+# See https://docs.scrapy.org/en/latest/topics/autothrottle.html
+#AUTOTHROTTLE_ENABLED = True
+# The initial download delay
+#AUTOTHROTTLE_START_DELAY = 5
+# The maximum download delay to be set in case of high latencies
+#AUTOTHROTTLE_MAX_DELAY = 60
+# The average number of requests Scrapy should be sending in parallel to
+# each remote server
+#AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
+# Enable showing throttling stats for every response received:
+#AUTOTHROTTLE_DEBUG = False
+
+# Enable and configure HTTP caching (disabled by default)
+# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
+#HTTPCACHE_ENABLED = True
+#HTTPCACHE_EXPIRATION_SECS = 0
+#HTTPCACHE_DIR = 'httpcache'
+#HTTPCACHE_IGNORE_HTTP_CODES = []
+#HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'

youlaparser/spiders/__init__.py

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+# This package will contain the spiders of your Scrapy project
+#
+# Please refer to the documentation for information on how to create and manage
+# your spiders.

youlaparser/spiders/youla.py

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+# -*- coding: utf-8 -*-
+import scrapy
+from scrapy.http import HtmlResponse
+from youlaparser.items import YoulaparserItem
+
+
+class YoulaSpider(scrapy.Spider):
+    name = 'youla.auto'
+    allowed_domains = ['youla.ru']
+    start_urls = ['https://auto.youla.ru/rossiya/cars/used/?vinChecked=1']
+
+    def parse(self, response:HtmlResponse):
+        links = response.xpath('//a[@class="SerpSnippet_name__3F7Yu SerpSnippet_titleText__1Ex8A blackLink"]/@href').extract()
+        for link in links:
+            yield response.follow(link, callback=self.parse_links)
+
+    def parse_links(self, response:HtmlResponse):
+        title = response.xpath('//div[@data-target="advert-title"]/text()').extract_first()
+        images = response.xpath('//img[@class="PhotoGallery_photoImage__2mHGn"]/@src').extract()
+        yield YoulaparserItem(link=response.url, title=title, images=images)