Spidering Hacks

DrCarbonite writes "Spidering Hacks is a well-written guide to scripting and automating your data-seeking forays onto the Internet. It offers an attractive combination of the solving the problems you have and exposing you to solutions that you weren't aware you needed." Read on for Martin's review of the book. Spidering Hacks author Kevin Hemenway and Tara Calishain pages 402 publisher O'Reilly rating 8 reviewer Jeff Martin ISBN 0596005776 summary A wide-ranging collection of hacks detailing how to be more productive in Internet research and data retrieval

Introduction Spidering Hacks (SH), by Kevin Hemenway and Tara Calishain, is a practical guide to performing Internet research that goes beyond a simple Google search. SH demonstrates how scripting and other techniques can increase the power and efficiency of your Internet searching, allowing the computer to obtain data, leaving the user free to spend more time on analysis.

SH's language of choice is Perl, and while there are a few guest appearances by Java and Python, some basic Perl fluency will serve the reader well in reading the Hack's source code. However, regardless of your language preference, SH is still a useful resource. The authors discuss ethics and guidelines for writing polite and properly behaved spiders as well as the concepts and reasoning behind the scripts they present. For this reason, non-Perl coders can still stand to learn a lot of useful tips that will help them with their own projects.

Overview

Chapter 1, Walking Softly, covers the basics of spiders and scrapers, and includes tips on proper etiquette for Web robots as well as some resources for identifying and registering the many Web robots/spiders that exist on the Internet. Hemenway and Calishain should be credited for taking the time to be civically responsible and giving their readers appreciation for the power they are utilizing.

Chapter 2, "Assembling a Toolbox," covers how to obtain the Perl modules used by the book, respecting robots.txt, and various topics (Perls LWP and WWW::Mechanize modules for example) that will provide the reader with a solid foundation throughout the rest of the book. SH does a great job introducing some topics that not all members in its target audience may be familiar with (i.e., regular expressions, the use of pipes, XPath).

Chapter 3, "Collecting Media Files," deals with obtaining files from POP3 email attachments, the Library of Congress, and Web cams, among other sources. While individual sites described here may not appeal to everyone, the idea is to provide a specific example demonstrating each of certain general concepts, which can be applied to sites of the reader's choosing.

Chapter 4, "Gleaning Data from Databases," approaches various online databases. There are some interesting hacks here, such as those that leverage Google and Yahoo together. This chapter is the longest, and provides the greatest variety of hacks. It also discusses locating, manipulating, and generating RSS feeds, as well as other miscellaneous tasks such as downloading horoscopes to an iPod.

Hack #48, Super Word Lookup, is a good example of why SH is so intriguing. While utilizing a dictionary or thesaurus via a browser is simple, having the ability to do so with a command-line program allows the user an automated approach, reducing distractions.

Chapter 5, "Maintaining Your Collections," discusses ways to automate retrieval using cron and practical alternatives for Windows users.

Chapter 6, "Giving Back to the World," ends SH by covering practical ways the reader can give back to the Internet and avoid the ignominious leech designation. This chapter provides information on creating public RSS feeds, making an organization's resources available for easy retrieval by spiders, and using instant messaging with a spider.

Conclusion

There are extensive links provided throughout the book, and this indirectly contributes to SH's worth. The usual O'Reilly site for source code is available and Hemenway also provides some additional code on his site. A detailed listing of the hacks covered in SH is also available online from SH's table of contents.

The Hacks series is a relatively new genre for O'Reilly, but it is rapidly maturing and this growth is reflected in Spidering Hacks. Hemenway and Calishain have done good work in assembling a wide variety of tips that cover a broad spectrum of interests and applications. This is a solid effort, and I can easily recommend it to those looking to perform more effective Internet research as well as those looking for new scripting projects to undertake.

You can purchase Spidering Hacks from bn.com. Slashdot welcomes readers' book reviews -- to submit a review for consideration, read the book review guidelines, then visit the submission page.

Comments

o fer crissakes

[Bob Cat - NYMPHS]

somebody forget a by any chance?

Re:New book: Hacking your way into a Spider Hole

[tsmccaff]

The term "spider hole" has been part military parlance since WWII, but gained common usage outside the military during Vietnam. It may refer to the trapdoor spider, who doesn't use a web, but rather pops out of a hole in the ground, surprising its prey.