In this chapter, we discussed many topics surrounding concurrency in web scraping. We looked at what concurrency is and how we can benefit from it. We reviewed some of the common issues that must be avoided when building concurrent programs. We also learned about the Go concurrency model and how to use its primitive objects to build concurrent Go applications. Finally, we looked at a few of the niceties Go has included in its sync package. In our final chapter, we will look at taking our scraper to the highest level.
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Go Web Scraping Quick Start Guide
By :
Go Web Scraping Quick Start Guide
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Overview of this book
Web scraping is the process of extracting information from the web using various tools that perform scraping and crawling. Go is emerging as the language of choice for scraping using a variety of libraries. This book will quickly explain to you, how to scrape data data from various websites using Go libraries such as Colly and Goquery.
The book starts with an introduction to the use cases of building a web scraper and the main features of the Go programming language, along with setting up a Go environment. It then moves on to HTTP requests and responses and talks about how Go handles them. You will also learn about a number of basic web scraping etiquettes.
You will be taught how to navigate through a website, using a breadth-first and then a depth-first search, as well as find and follow links. You will get to know about the ways to track history in order to avoid loops and to protect your web scraper using proxies.
Finally the book will cover the Go concurrency model, and how to run scrapers in parallel, along with large-scale distributed web scraping.
Table of Contents (10 chapters)
Preface
Free Chapter
Introducing Web Scraping and Go
The Request/Response Cycle
Web Scraping Etiquette
Parsing HTML
Web Scraping Navigation
Protecting Your Web Scraper
Scraping with Concurrency
Scraping at 100x
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