scrapyrunner 0.0.2

A Python library to run Scrapy spiders directly from your code.

ScrapyRunner

A Python library to run Scrapy spiders directly from your code.

Overview

ScrapyRunner is a lightweight library that enables you to run Scrapy spiders in your Python code, process scraped items using custom processors, and manage Scrapy signals seamlessly. It simplifies the process of starting and managing Scrapy spiders and integrates well with your existing Python workflows.

Features

• Run Scrapy spiders directly from Python code.
• Process scraped items in batches with a custom processor.
• Manage Scrapy signals (e.g., on item scraped, on engine stopped).
• Easy integration with the Scrapy framework.
• Asynchronous processing of items using Twisted.

Installation

To install ScrapyRunner, you can use pip:

pip install scrapyrunner

Usage

Example

from time import sleep
import scrapy
from scrapyrunner import ScrapyRunner, ItemProcessor

# Define a Scrapy Spider
class MySpider(scrapy.Spider):
    name = 'example'
    
    def parse(self, response):
        data = response.xpath("//title/text()").extract_first()
        return {"title": data}

# Define a custom Item Processor
class MyProcessor(ItemProcessor):
    def process_item(self, item: scrapy.Item) -> None:
        sleep(2)  # Simulate a delay for processing
        print(">>>", item, "<<<")

if __name__ == '__main__':
    # Create an instance of ScrapyRunner with the spider and processor
    scrapy_runner = ScrapyRunner(spider=MySpider, processor=MyProcessor)
    scrapy_runner.run(start_urls=["https://example.org"])  # Start scraping

How it works:

1. Define a Spider: In this example, MySpider extracts the title of a webpage.
2. Define a Processor: MyProcessor processes scraped items (here it simply sleeps for 2 seconds to simulate real processing).
3. Run the ScrapyRunner: The ScrapyRunner class is used to run the spider and process the items. The run() method triggers the scraping, and each item scraped is passed to the custom processor.

Customization

Custom Processor

To create your own custom processor:

1. Subclass ItemProcessor.
2. Override the process_item() method to handle scraped items.
3. Process each item as needed (e.g., save to a database, perform additional transformations, etc.).

class MyCustomProcessor(ItemProcessor):
    def process_item(self, item: scrapy.Item) -> None:
        # Custom processing logic goes here
        print("Processing item:", item)

Custom Settings

You can pass custom Scrapy settings to ScrapyRunner:

settings = {
    "LOG_LEVEL": "DEBUG",
    "USER_AGENT": "MyCustomAgent",
    # Add more custom settings as needed
}

runner = ScrapyRunner(spider=MySpider, settings=settings)
runner.run(start_urls=["https://example.org"])

License

This project is licensed under the MIT License - see the LICENSE file for details.