python - Scrapy crawler ignores `DOWNLOADER_MIDDLEWARES` when run as a script -


i'd acquire data, using scrapy, few different sites , perform analysis on data. since both crawlers , code analyze data relate same project, i'd store in same git repository. created minimal reproducible example on github.

the structure of project looks this:

./crawlers ./crawlers/__init__.py ./crawlers/myproject ./crawlers/myproject/__init__.py ./crawlers/myproject/myproject ./crawlers/myproject/myproject/__init__.py ./crawlers/myproject/myproject/items.py ./crawlers/myproject/myproject/pipelines.py ./crawlers/myproject/myproject/settings.py ./crawlers/myproject/myproject/spiders ./crawlers/myproject/myproject/spiders/__init__.py ./crawlers/myproject/myproject/spiders/example.py ./crawlers/myproject/scrapy.cfg ./scrapyscript.py

from ./crawlers/myproject folder, can execute crawler typing:

scrapy crawl example

the crawler uses downloader middleware, specifically, alecxe's excellent scrapy-fake-useragent. settings.py:

downloader_middlewares = {     'scrapy.contrib.downloadermiddleware.useragent.useragentmiddleware': none,     'scrapy_fake_useragent.middleware.randomuseragentmiddleware': 400, }

when executed using scrapy crawl ... useragent looks real browser. here's sample record webserver:

24.8.42.44 - - [16/jun/2015:05:07:59 +0000] "get / http/1.1" 200 27161 "-" "mozilla/5.0 (windows nt 6.3; win64; x64) applewebkit/537.36 (khtml, gecko) chrome/37.0.2049.0 safari/537.36"

looking @ documentation, it's possible equivalent of scrapy crawl ... script. scrapyscript.py file, based on documentation, looks this:

from twisted.internet import reactor scrapy.crawler import crawler scrapy import log, signals  scrapy.utils.project import get_project_settings crawlers.myproject.myproject.spiders.example import examplespider  spider = examplespider() settings = get_project_settings()  crawler = crawler(settings) crawler.signals.connect(reactor.stop, signal=signals.spider_closed) crawler.configure() crawler.crawl(spider)  crawler.start() log.start() reactor.run()

when execute script, can see crawler makes page requests. unfortunately, ignoring downloader_middlewares. useragent, example, no longer spoofed:

24.8.42.44 - - [16/jun/2015:05:32:04 +0000] "get / http/1.1" 200 27161 "-" "scrapy/0.24.6 (+http://scrapy.org)"

somehow, when crawler executed script, seems ignoring settings in settings.py.

can see i'm doing wrong?

in order get_project_settings() find desired settings.py, set scrapy_settings_moduleenvironment variable:

import os import sys  # ...  sys.path.append(os.path.join(os.path.curdir, "crawlers/myproject")) os.environ['scrapy_settings_module'] = 'myproject.settings'  settings = get_project_settings()

note that, due location of runner script, need add myproject sys.path. or, move scrapyscript.py under myproject directory.


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