func (p *RedisPacer) CanBid(campaign rtb.Campaign) bool {
id := campaign.Id()
key := p.paceAccountKey(campaign.Id())
// Update remaining budget every time to compensate for unspent bids last cycle
cpi := rtb.MicroCentsPerImpression(campaign.BidCpmInMicroCents())
budget := p.banker.RemainingDailyBudgetInMicroCents(id)
// Account not yet configured, or they actually have no budget. The pacer is not needed.
if budget == 0 || cpi == 0 {
return true // Allow it to pass and configure it
}
now := time.Now().UTC()
midnight := time.Date(now.Year(), now.Month(), now.Day()+1, 0, 0, 0, 0, time.UTC)
// TODO: This definitely only needs to be calculated at the end of each segment. Not every time we request a bid.
durationToMidnight := midnight.Sub(now)
segmentsToMidnight := int64(durationToMidnight / p.segment)
remaining := (budget / cpi) / segmentsToMidnight
remainingBudget, err := p.da.DebitIfNotZero(key, 1, remaining, time.Now().UTC().Add(p.segment))
// fmt.Printf("Campign: %v, Bids Per Segment: %v, Segment: %v, Remaining Budget: %v\n", id, remaining, p.segment, remainingBudget)
if err == nil {
return remainingBudget > 0
} else {
return false
}
}
// highestBidder Returns the highest bidder with available funds.
// campaigns must be in order from highest CPM to lowest
// Caller is committed to using the campaign returned by this
func (b *BidRequestBidder) highestBidder(campaigns []rtb.Campaign) (campaign rtb.Campaign, remainingDailyBudgetInMicroCents int64) {
for _, campaign := range campaigns {
id := campaign.Id()
if b.Pacer == nil || b.Pacer.CanBid(campaign) {
bid := campaign.BidCpmInMicroCents()
if remainingDailyBudgetInMicroCents, err := b.CampaignProvider.DebitCampaign(id, rtb.MicroCentsPerImpression(bid), b.dailyBudgetExpirationTime); err == nil {
return campaign, remainingDailyBudgetInMicroCents
}
}
}
return nil, 0
}