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price_granularity.go
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/
price_granularity.go
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package exchange
import (
"math"
"strconv"
"github.com/prebid/openrtb/v20/openrtb2"
"github.com/prebid/prebid-server/v2/openrtb_ext"
)
// GetPriceBucket is the externally facing function for computing CPM buckets
func GetPriceBucket(bid openrtb2.Bid, targetingData targetData) string {
cpmStr := ""
bucketMax := 0.0
bucketMin := 0.0
increment := 0.0
config := targetingData.priceGranularity //assign default price granularity
if bidType, err := getMediaTypeForBid(bid); err == nil {
if bidType == openrtb_ext.BidTypeBanner && targetingData.mediaTypePriceGranularity.Banner != nil {
config = *targetingData.mediaTypePriceGranularity.Banner
} else if bidType == openrtb_ext.BidTypeVideo && targetingData.mediaTypePriceGranularity.Video != nil {
config = *targetingData.mediaTypePriceGranularity.Video
} else if bidType == openrtb_ext.BidTypeNative && targetingData.mediaTypePriceGranularity.Native != nil {
config = *targetingData.mediaTypePriceGranularity.Native
}
}
precision := *config.Precision
cpm := bid.Price
for i := 0; i < len(config.Ranges); i++ {
if config.Ranges[i].Max > bucketMax {
bucketMax = config.Ranges[i].Max
}
// find what range cpm is in
if cpm >= config.Ranges[i].Min && cpm <= config.Ranges[i].Max {
increment = config.Ranges[i].Increment
bucketMin = config.Ranges[i].Min
}
}
if cpm > bucketMax {
// We are over max, just return that
cpmStr = strconv.FormatFloat(bucketMax, 'f', precision, 64)
} else if increment > 0 {
// If increment exists, get cpm string value
cpmStr = getCpmTarget(cpm, bucketMin, increment, precision)
}
return cpmStr
}
func getCpmTarget(cpm float64, bucketMin float64, increment float64, precision int) string {
roundedCPM := math.Floor((cpm-bucketMin)/increment)*increment + bucketMin
return strconv.FormatFloat(roundedCPM, 'f', precision, 64)
}