Add basic GCP pricing support

pkg/controller/dgraph/models/constants.go

@@ -12,6 +12,7 @@ const (
 
 	// Cloud provider constants
 	AWS = "aws"
+	GCP = "gcp"
 
 	// Time constants
 	HoursInMonth = 720

pkg/controller/dgraph/models/rateCard.go

@@ -187,10 +187,15 @@ func getPerUnitResourcePriceForNode(nodeName string) (float64, float64) {
 }
 
 func getPricePerUnitResourceFromNodePrice(node Node) (float64, float64) {
-	nodePriceXID := node.InstanceType + "-" + node.OS
-	nodePrice, err := retrieveNodePrice(nodePriceXID)
-	if err == nil {
-		return nodePrice.PricePerCPU, nodePrice.PricePerMemory
+	xidsToTry := []string{
+		node.InstanceType + "-" + node.OS,
+		node.InstanceType + "-ANY",
+	}
+	for _, xid := range xidsToTry {
+		nodePrice, err := retrieveNodePrice(xid)
+		if err == nil {
+			return nodePrice.PricePerCPU, nodePrice.PricePerMemory
+		}
 	}
 	return DefaultCPUCostInFloat64, DefaultMemCostInFloat64
 }

pkg/pricing/cloud.go

@@ -21,6 +21,7 @@ import (
 	"github.com/Sirupsen/logrus"
 	"github.com/vmware/purser/pkg/controller/dgraph/models"
 	"github.com/vmware/purser/pkg/pricing/aws"
+	"github.com/vmware/purser/pkg/pricing/gcp"
 	"k8s.io/client-go/kubernetes"
 )
 
@@ -42,9 +43,18 @@ func GetClusterProviderAndRegion() (string, string) {
 
 // PopulateRateCard given a cloud (cloudProvider and region) it populates corresponding rate card in dgraph
 func (c *Cloud) PopulateRateCard() {
+	var rateCard *models.RateCard
+
 	switch c.CloudProvider {
 	case models.AWS:
-		rateCard := aws.GetRateCardForAWS(c.Region)
+		rateCard = aws.GetRateCardForAWS(c.Region)
+	case models.GCP:
+		rateCard = gcp.GetRateCardForGCP(c.Region)
+	}
+
+	if rateCard != nil {
 		models.StoreRateCard(rateCard)
+	} else {
+		logrus.Printf("Could not get rate card")
 	}
 }