scrapy-toolbox 0.0.5

Saves Scrapy exceptions in your Database

scrapy-toolbox

A Python library that extends Scrapy with the following features:

• Support for Google App Engine (GAE): Bypass Google App Engines 24 hour execution time limit (https://cloud.google.com/appengine/docs/standard/go/how-instances-are-managed#scaling_types) by dividing the start_urls into x parts
• Error Saving to the Database Table "errors" for manual error analysis (incl. traceback and response) and automated request reconstruction containing the following columns:
  • failed_at
  • spider
  • traceback
  • request_method
  • request_url
  • request_meta (json dump that can be loaded with json.loads())
  • request_cookies (json dump that can be loaded with json.loads())
  • request_headers (json dump that can be loaded with json.loads())
  • request_body
  • response_status
  • response_url
  • response_headers (json dump that can be loaded with json.loads())
  • response_body

Requisites:

• settings.py with a dict for DATABASE_DEV and DATABASE

Installation

pip install scrapy-toolbox

Setup

Add scrapy_toolbox.error_handling.ErrorSavingMiddleware and scrapy_toolbox.google_app_engine_support.GaePartCalcMiddleware extensions to your Scrapy Project settings.py.

Example:

# settings.py
SPIDER_MIDDLEWARES = {
    'scrapy_toolbox.error_handling.ErrorSavingMiddleware': 1000,
    'scrapy_toolbox.google_app_engine_support.GaePartCalcMiddleware': 1000,
}

Usage

• The ErrorSavingMiddleware defines a errback Callback for your Requests. So if you want to make use of this Feature do not define any errback.
• To split the start_urls into x parts just start your spider by adding the two arguments part and number_of_parts where part is the part which should be executed during this run and number_of_parts defines the number of parts that exist in total. So if you want to split your start_urls into 3 Parts:

  scrapy crawl test -a part=1 -a number_of_parts=3
  scrapy crawl test -a part=2 -a number_of_parts=3
  scrapy crawl test -a part=3 -a number_of_parts=3

Supported versions

This package works with Python 3. It has been tested with Scrapy up to version 1.4.0.

Tasklist

• [] Process Errors from your Database Table "errors" at a later time and execute failed Request: for instance when the website was down or you got an Exception during parsing for specific requests and want to crawl them again
• [] Automatic Part calculation and saving in DB???

Build Realease

python setup.py sdist twine upload dist/*