Refactor schedulers, remove schedulers, use generic scheduler.

pkg/scheduler/predicates.go

@@ -0,0 +1,65 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package scheduler
+
+import (
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
+)
+
+func PodFitsPorts(pod api.Pod, existingPods []api.Pod, node string) (bool, error) {
+	for _, scheduledPod := range existingPods {
+		for _, container := range pod.DesiredState.Manifest.Containers {
+			for _, port := range container.Ports {
+				if port.HostPort == 0 {
+					continue
+				}
+				if containsPort(scheduledPod, port) {
+					return false, nil
+				}
+			}
+		}
+	}
+	return true, nil
+}
+
+func containsPort(pod api.Pod, port api.Port) bool {
+	for _, container := range pod.DesiredState.Manifest.Containers {
+		for _, podPort := range container.Ports {
+			if podPort.HostPort == port.HostPort {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+// MapPodsToMachines obtains a list of pods and pivots that list into a map where the keys are host names
+// and the values are the list of pods running on that host.
+func MapPodsToMachines(lister PodLister) (map[string][]api.Pod, error) {
+	machineToPods := map[string][]api.Pod{}
+	// TODO: perform more targeted query...
+	pods, err := lister.ListPods(labels.Everything())
+	if err != nil {
+		return map[string][]api.Pod{}, err
+	}
+	for _, scheduledPod := range pods {
+		host := scheduledPod.CurrentState.Host
+		machineToPods[host] = append(machineToPods[host], scheduledPod)
+	}
+	return machineToPods, nil
+}