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// A restartable crawler that extracts links from HTML pages and
// simply prints them.
//
package main
import (
"flag"
"log"
"net/http"
"strings"
"git.autistici.org/ale/crawl"
"git.autistici.org/ale/crawl/analysis"
)
var (
dbPath = flag.String("state", "crawldb", "crawl state database path")
concurrency = flag.Int("c", 10, "concurrent workers")
depth = flag.Int("depth", 10, "maximum link depth")
validSchemes = flag.String("schemes", "http,https", "comma-separated list of allowed protocols")
)
func extractLinks(c *crawl.Crawler, u string, depth int, resp *http.Response, err error) error {
links, err := analysis.GetLinks(resp)
if err != nil {
return err
}
for _, link := range links {
c.Enqueue(link, depth+1)
}
return nil
}
func main() {
flag.Parse()
seeds := crawl.MustParseURLs(flag.Args())
scope := []crawl.Scope{
crawl.NewSchemeScope(strings.Split(*validSchemes, ",")),
crawl.NewDepthScope(*depth),
crawl.NewSeedScope(seeds),
}
crawler, err := crawl.NewCrawler("crawldb", seeds, scope, crawl.FetcherFunc(http.Get), crawl.NewRedirectHandler(crawl.HandlerFunc(extractLinks)))
if err != nil {
log.Fatal(err)
}
crawler.Run(*concurrency)
}
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