scrape
A simple, higher level interface for Go web scraping.
When scraping with Go, I find myself redefining tree traversal and other utility functions.
This package is a place to put some simple tools which build on top of the Go HTML parsing library.
For the full interface check out the godoc
Sample
Scrape defines traversal functions like Find and FindAll while attempting
to be generic. It also defines convenience functions such as Attr and Text.
// Parse the page
root, err := html.Parse(resp.Body)
if err != nil {
// handle error
}
// Search for the title
title, ok := scrape.Find(root, scrape.ByTag(atom.Title))
if ok {
// Print the title
fmt.Println(scrape.Text(title))
}A full example: Scraping Hacker News
package main
import (
"fmt"
"net/http"
"github.com/yhat/scrape"
"golang.org/x/net/html"
"golang.org/x/net/html/atom"
)
func main() {
// request and parse the front page
resp, err := http.Get("https://news.ycombinator.com/")
if err != nil {
panic(err)
}
root, err := html.Parse(resp.Body)
if err != nil {
panic(err)
}
// define a matcher
matcher := func(n *html.Node) bool {
// must check for nil values
if n.DataAtom == atom.A && n.Parent != nil && n.Parent.Parent != nil {
return scrape.Attr(n.Parent.Parent, "class") == "athing"
}
return false
}
// grab all articles and print them
articles := scrape.FindAll(root, matcher)
for i, article := range articles {
fmt.Printf("%2d %s (%s)\n", i, scrape.Text(article), scrape.Attr(article, "href"))
}
}