Generic Crawler
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The document describes a generic crawler that can crawl websites without APIs by using rules to extract data. It discusses the crawler's infrastructure, introduction to crawler rules using XPATH and CSS expressions, the crawl procedure of generating links, crawling based on links and saving data to a local DB, and limitations such as not working on AJAX sites. The goal is to build a multipurpose crawler powered by cloud computing that can extract information from various websites.
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Generic Crawler
- 1. Generic Crawler CRAWL THE WORLD!
- 2. Content • Introduction to Generic Crawler • The Infrastructure • Introduction to Crawler Rule • Crawl Procedure • Data Fact Sheet • Limitation • Future Work
- 3. Introduction to Generic Crawler • Information are not only in Social Media • Some websites do not provide API Proposed Solution • Multi purpose Crawler • Rule based crawler • The power of cloud
- 5. Introduction to Crawler Rule • XPATH or CSS Expression • Tree Data Structure • Deep First Search Algorithm XPATH • Search HTML Tag • String and Array basic function • Text extraction (Remove HTML tag)
- 6. Introduction to Crawler Rule XPATH: //div[@class=‘detail_content]
- 7. Crawler Procedure Link Generation • Schedule Auto Runner task • Schedule Auto Pusher task Crawl • Crawl based of the links • Save the crawled data to local DB On-Demand Central DB Pusher • Keyword Matching • Push to Central DB
- 8. Data Fact Sheet Average Crawling Time 15s * Based on 1,000 links New Links Generation Time 3/min * From 5 sources
- 9. Limitation • AJAX Website • Depends on Rule • High CPU and Bandwidth demand • Robot.txt Links Viva.co.id 724 Detik.com 418 Beritajatim.com 120 Hukumonline.com 13 * Last update: 27 January 2016 – 16:00
- 10. Future Work • Input URL to scrap • Scheduler for Auto Crawl • Crawler Health Monitoring System