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package main
import (
"time"
"github.com/gocolly/colly"
)
func (app *App) Scrape(shops []Shop) {
wait := make(chan bool)
count := 0
for _, shop := range shops {
go app.ScrapeShop(shop, wait)
count++
}
// Wait until all go routines finished
for i := 0; i < count; i++ {
<-wait
}
}
func (app *App) ScrapeShop(shop Shop, wait chan bool) {
var W []Angebot
var err error
// retry on error
for i := 1; i < 4; i++ {
W = app.ScrapeHTML(shop)
W = sanitize_offer(W, shop, i)
if len(W) >= 1 {
break
}
}
// if no results, return early
if len(W) == 0 {
wait <- true
return
}
err = app.save_offer(W)
if err != nil {
shop.error_msg = err.Error()
shop.Warn("Saving offers failed.")
}
err = app.remove_expired(W, shop)
if err != nil {
shop.error_msg = err.Error()
shop.Warn("Removing expired offers failed.")
}
wait <- true
}
func (app *App) ScrapeHTML(shop Shop) []Angebot {
switch shop.Name {
case "Bottleworld":
return app.ScrapeBottleWord(shop)
case "MC Whisky":
return app.ScrapeMCWhisky(shop)
case "Rum & Co":
return app.ScrapeRumundCo(shop)
case "Whic":
return app.ScrapeWhic(shop)
case "Whisky.de":
return app.ScrapeWhiskyde(shop)
case "Whiskysite":
return app.ScrapeWhiskysitenl(shop)
case "Whisky World":
return app.ScrapeWhiskyworld(shop)
case "Whiskyzone":
return app.ScrapeWhiskyzone(shop)
case "Drankdozijn":
return app.ScrapeDrankdozijn(shop)
default:
shop.Warn("No Crawler")
}
return []Angebot{}
}
/*
* 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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