Restoring offerUtils. Had deleted this by mistake.

utilities/offerUtils/offerUtils.go

@@ -0,0 +1,62 @@
+package offerUtils
+
+import (
+	mesos "github.com/mesos/mesos-go/mesosproto"
+	"strings"
+)
+
+func OfferAgg(offer *mesos.Offer) (float64, float64, float64) {
+	var cpus, mem, watts float64
+
+	for _, resource := range offer.Resources {
+		switch resource.GetName() {
+		case "cpus":
+			cpus += *resource.GetScalar().Value
+		case "mem":
+			mem += *resource.GetScalar().Value
+		case "watts":
+			watts += *resource.GetScalar().Value
+		}
+	}
+
+	return cpus, mem, watts
+}
+
+// Determine the power class of the host in the offer
+func PowerClass(offer *mesos.Offer) string {
+	var powerClass string
+	for _, attr := range offer.GetAttributes() {
+		if attr.GetName() == "class" {
+			powerClass = attr.GetText().GetValue()
+		}
+	}
+	return powerClass
+}
+
+// Implements the sort.Sort interface to sort Offers based on CPU.
+// TODO: Have a generic sorter that sorts based on a defined requirement (CPU, RAM, DISK or Watts)
+type OffersSorter []*mesos.Offer
+
+func (offersSorter OffersSorter) Len() int {
+	return len(offersSorter)
+}
+
+func (offersSorter OffersSorter) Swap(i, j int) {
+	offersSorter[i], offersSorter[j] = offersSorter[j], offersSorter[i]
+}
+
+func (offersSorter OffersSorter) Less(i, j int) bool {
+	// getting CPU resource availability of offersSorter[i]
+	cpu1, _, _ := OfferAgg(offersSorter[i])
+	// getting CPU resource availability of offersSorter[j]
+	cpu2, _, _ := OfferAgg(offersSorter[j])
+	return cpu1 <= cpu2
+}
+
+// Is there a mismatch between the task's host requirement and the host corresponding to the offer.
+func HostMismatch(offerHost string, taskHost string) bool {
+	if taskHost != "" && !strings.HasPrefix(offerHost, taskHost) {
+		return true
+	}
+	return false
+}