func (s *rankStrategy) NextAd(client *models.Client) (*models.Ad, log.ServerError) {
isNew := s.isNewRand.Float32() < s.dbConfig.NewTrafficPercentage()
ad, _ := s.getNewAd(isNew, client.Info)
if ad != nil {
return ad, nil
}
adIDs, ad, err := s.getAdIDs(isNew, client.Info)
if ad != nil {
return ad, nil
} else if err != nil {
return nil, log.New(http.StatusNotFound, notFoundDesc, err)
}
if adIDs == nil {
return nil, log.NewError(http.StatusNotFound, notFoundDesc)
}
viewsPerAd, conversionsPerAd := s.getStatistics(adIDs)
rankPerAd, totalRank := calculateRanks(viewsPerAd, conversionsPerAd)
adID := s.chooseAd(adIDs, rankPerAd, totalRank)
ad, err = s.db.Ads().GetAdByID(&adID)
if err != nil {
return nil, log.New(http.StatusNotFound, notFoundDesc, err)
}
return ad, nil
}
func (c *appsCollection) GetApp(r *http.Request) (*App, log.ServerError) {
token := r.URL.Query().Get("appToken")
if token == "" {
return nil, log.NewError(http.StatusBadRequest, "App token is not specified")
}
var app App
err := c.Find(&bson.M{"appToken": token}).One(&app)
if err != nil {
return nil, log.New(http.StatusForbidden, fmt.Sprintf("app token %v is not found", token), err)
}
return &app, nil
}