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package main
import (
"time"
log "github.com/sirupsen/logrus"
"github.com/gocolly/colly"
)
func (app *App) Scrape(platforms []Platform) {
wait := make(chan bool)
count := 0
for _, platform := range platforms {
go app.ScrapeHTML(platform, wait)
count++
}
// Wait until all go routines finished
for i := 0; i < count; i++ {
<-wait
}
}
func (app *App) ScrapeHTML(platform Platform, wait chan bool) {
var Entries []Entry
var err error
// retry on error
for i := 1; i < 4; i++ {
Entries = app.ScrapePlatform(platform)
if len(Entries) >= 1 {
break
}
}
// if no results, return early
if len(Entries) == 0 {
wait <- true
return
}
err = app.SaveEntries(Entries)
if err != nil {
Warn(err, "Saving entries failed. Platform: "+platform.Name)
}
wait <- true
}
func (app *App) ScrapePlatform(platform Platform) []Entry {
switch platform.Name {
case "Github":
return app.ScrapeGithub(platform)
default:
log.Println(platform.Name + ": No Crawler")
}
return []Entry{}
}
/*
* Sets the crawler config.
*/
func (app *App) customCollector(allowed_urls []string) *colly.Collector {
c := colly.NewCollector(
colly.UserAgent(app.Config.UserAgent),
colly.AllowedDomains(allowed_urls...),
)
c.IgnoreRobotsTxt = app.Config.IgnoreRobotsTXT
c.Limit(&colly.LimitRule{
DomainGlob: "*",
RandomDelay: time.Duration(app.Config.Delay) * time.Second,
})
return c
}
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