github.com/prebid/prebid-server@v0.275.0/exchange/price_granularity.go (about)

     1  package exchange
     2  
     3  import (
     4  	"github.com/prebid/openrtb/v19/openrtb2"
     5  	"github.com/prebid/prebid-server/openrtb_ext"
     6  	"math"
     7  	"strconv"
     8  )
     9  
    10  // GetPriceBucket is the externally facing function for computing CPM buckets
    11  func GetPriceBucket(bid openrtb2.Bid, targetingData targetData) string {
    12  	cpmStr := ""
    13  	bucketMax := 0.0
    14  	bucketMin := 0.0
    15  	increment := 0.0
    16  
    17  	config := targetingData.priceGranularity //assign default price granularity
    18  
    19  	if bidType, err := getMediaTypeForBid(bid); err == nil {
    20  		if bidType == openrtb_ext.BidTypeBanner && targetingData.mediaTypePriceGranularity.Banner != nil {
    21  			config = *targetingData.mediaTypePriceGranularity.Banner
    22  		} else if bidType == openrtb_ext.BidTypeVideo && targetingData.mediaTypePriceGranularity.Video != nil {
    23  			config = *targetingData.mediaTypePriceGranularity.Video
    24  		} else if bidType == openrtb_ext.BidTypeNative && targetingData.mediaTypePriceGranularity.Native != nil {
    25  			config = *targetingData.mediaTypePriceGranularity.Native
    26  		}
    27  	}
    28  
    29  	precision := *config.Precision
    30  
    31  	cpm := bid.Price
    32  	for i := 0; i < len(config.Ranges); i++ {
    33  		if config.Ranges[i].Max > bucketMax {
    34  			bucketMax = config.Ranges[i].Max
    35  		}
    36  		// find what range cpm is in
    37  		if cpm >= config.Ranges[i].Min && cpm <= config.Ranges[i].Max {
    38  			increment = config.Ranges[i].Increment
    39  			bucketMin = config.Ranges[i].Min
    40  		}
    41  	}
    42  
    43  	if cpm > bucketMax {
    44  		// We are over max, just return that
    45  		cpmStr = strconv.FormatFloat(bucketMax, 'f', precision, 64)
    46  	} else if increment > 0 {
    47  		// If increment exists, get cpm string value
    48  		cpmStr = getCpmTarget(cpm, bucketMin, increment, precision)
    49  	}
    50  
    51  	return cpmStr
    52  }
    53  
    54  func getCpmTarget(cpm float64, bucketMin float64, increment float64, precision int) string {
    55  	roundedCPM := math.Floor((cpm-bucketMin)/increment)*increment + bucketMin
    56  	return strconv.FormatFloat(roundedCPM, 'f', precision, 64)
    57  }