WaterCrawl through a standardized plugin interface (watercrawl-plugin) to achieve flexible expansion of the crawler logic , the architecture uses a decorator pattern allows developers to crawl the life cycle of the six key nodes to inject custom code . Typical extension scenarios include: implementing a sliding CAPTCHA cracking module, customizing NLP-based body text extraction algorithms, or adding proxy IP pool management functionality.
Technical specifications require plug-ins must inherit BaseSpiderMiddleware class and implement method hooks such as process_response. A financial enterprise through the development of stock exchange announcement parsing plug-ins , successfully PDF financial reports of the table extraction accuracy from 72% to 91%. open source community to provide anti-anti-crawler plug-in set has been to support Cloudflare, Akamai and other 15 kinds of common protection systems to bypass the strategy .
The plug-in hot loading mechanism supports updating the processing logic without restarting the service, and with the version control API can realize the gray scale release. Test data show that the existence of the plug-in system shortens the customized development cycle by 40%, which is especially suitable for target website structures that need to cope with frequent changes.
This answer comes from the articleWaterCrawl: transforming web content into data usable for large modelsThe
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