============ Scrapy-Redis

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Redis-based components for Scrapy.

• Usage: https://github.com/rmax/scrapy-redis/wiki/Usage
• Documentation: https://github.com/rmax/scrapy-redis/wiki.
• Release: https://github.com/rmax/scrapy-redis/wiki/History
• Contribution: https://github.com/rmax/scrapy-redis/wiki/Getting-Started
• LICENSE: MIT license

Features

• Distributed crawling/scraping

  You can start multiple spider instances that share a single redis queue. Best suitable for broad multi-domain crawls.

• Distributed post-processing

  Scraped items gets pushed into a redis queued meaning that you can start as many as needed post-processing processes sharing the items queue.

• Scrapy plug-and-play components

  Scheduler + Duplication Filter, Item Pipeline, Base Spiders.

• In this forked version: added json supported data in Redis

  data contains url, meta and other optional parameters. meta is a nested json which contains sub-data. this function extract this data and send another FormRequest with url, meta and addition formdata.

  For example:

  .. code-block:: json

  { "url": "https://exaple.com", "meta": {"job-id":"123xsd", "start-date":"dd/mm/yy"}, "url_cookie_key":"fertxsas" }

  this data can be accessed in scrapy spider through response. like: request.url, request.meta, request.cookies

.. note:: This features cover the basic case of distributing the workload across multiple workers. If you need more features like URL expiration, advanced URL prioritization, etc., we suggest you to take a look at the Frontera_ project.

Requirements

• Python 3.7+
• Redis >= 5.0
• Scrapy >= 2.0
• redis-py >= 4.0

Installation

From pip

.. code-block:: bash

pip install scrapy-redis

From GitHub

.. code-block:: bash

git clone https://github.com/darkrho/scrapy-redis.git
cd scrapy-redis
python setup.py install

.. note:: For using this json supported data feature, please make sure you have not installed the scrapy-redis through pip. If you already did it, you first uninstall that one.

.. code-block:: bash

pip uninstall scrapy-redis

Alternative Choice

Frontera is a web crawling framework consisting of crawl frontier, and distribution/scaling primitives, allowing to build a large scale online web crawler.

.. _Frontera: https://github.com/scrapinghub/frontera .. _crawl frontier: http://nlp.stanford.edu/IR-book/html/htmledition/the-url-frontier-1.html