add e2e test on the hostport predicates

plugin/pkg/scheduler/algorithm/predicates/utils.go

@@ -22,6 +22,7 @@ import (
 	"k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
+	schedutil "k8s.io/kubernetes/plugin/pkg/scheduler/util"
 )
 
 // FindLabelsInSet gets as many key/value pairs as possible out of a label set.
@@ -98,7 +99,7 @@ type hostPortInfo struct {
 	hostPort string
 }
 
-// decode a string ("protocol/hostIP/hostPort") to *hostPortInfo object
+// decode decodes string ("protocol/hostIP/hostPort") to *hostPortInfo object.
 func decode(info string) *hostPortInfo {
 	hostPortInfoSlice := strings.Split(info, "/")
 
@@ -112,3 +113,48 @@ func decode(info string) *hostPortInfo {
 		hostPort: hostPort,
 	}
 }
+
+// specialPortConflictCheck detects whether specailHostPort(whose hostIP is 0.0.0.0) is conflict with otherHostPorts.
+// return true if we have a conflict.
+func specialPortConflictCheck(specialHostPort string, otherHostPorts map[string]bool) bool {
+	specialHostPortInfo := decode(specialHostPort)
+
+	if specialHostPortInfo.hostIP == schedutil.DefaultBindAllHostIP {
+		// loop through all the otherHostPorts to see if there exists a conflict
+		for hostPortItem := range otherHostPorts {
+			hostPortInfo := decode(hostPortItem)
+
+			// if there exists one hostPortItem which has the same hostPort and protocol with the specialHostPort, that will cause a conflict
+			if specialHostPortInfo.hostPort == hostPortInfo.hostPort && specialHostPortInfo.protocol == hostPortInfo.protocol {
+				return true
+			}
+		}
+
+	}
+
+	return false
+}
+
+// portsConflict check whether existingPorts and wantPorts conflict with each other
+// return true if we have a conflict
+func portsConflict(existingPorts, wantPorts map[string]bool) bool {
+
+	for existingPort := range existingPorts {
+		if specialPortConflictCheck(existingPort, wantPorts) {
+			return true
+		}
+	}
+
+	for wantPort := range wantPorts {
+		if specialPortConflictCheck(wantPort, existingPorts) {
+			return true
+		}
+
+		// general check hostPort conflict procedure for hostIP is not 0.0.0.0
+		if existingPorts[wantPort] {
+			return true
+		}
+	}
+
+	return false
+}