mirror of https://github.com/k3s-io/k3s
140 lines
3.7 KiB
Go
140 lines
3.7 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package scheduler
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import (
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"fmt"
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"math/rand"
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"strconv"
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"testing"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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)
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func falsePredicate(pod api.Pod, existingPods []api.Pod, node string) (bool, error) {
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return false, nil
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}
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func truePredicate(pod api.Pod, existingPods []api.Pod, node string) (bool, error) {
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return true, nil
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}
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func matchesPredicate(pod api.Pod, existingPods []api.Pod, node string) (bool, error) {
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return pod.ID == node, nil
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}
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func numericPriority(pod api.Pod, podLister PodLister, minionLister MinionLister) (HostPriorityList, error) {
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nodes, err := minionLister.List()
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result := []HostPriority{}
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if err != nil {
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fmt.Errorf("failed to list nodes: %v", err)
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return nil, err
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}
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for _, minion := range nodes.Items {
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score, err := strconv.Atoi(minion.ID)
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if err != nil {
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return nil, err
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}
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result = append(result, HostPriority{
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host: minion.ID,
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score: score,
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})
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}
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return result, nil
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}
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func makeMinionList(nodeNames []string) api.MinionList {
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result := api.MinionList{
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Items: make([]api.Minion, len(nodeNames)),
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}
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for ix := range nodeNames {
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result.Items[ix].ID = nodeNames[ix]
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}
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return result
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}
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func TestGenericScheduler(t *testing.T) {
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tests := []struct {
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predicates []FitPredicate
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prioritizer PriorityFunction
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nodes []string
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pod api.Pod
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expectedHost string
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expectsErr bool
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}{
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{
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predicates: []FitPredicate{falsePredicate},
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prioritizer: EqualPriority,
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nodes: []string{"machine1", "machine2"},
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expectsErr: true,
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},
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{
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predicates: []FitPredicate{truePredicate},
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prioritizer: EqualPriority,
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nodes: []string{"machine1", "machine2"},
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// Random choice between both, the rand seeded above with zero, chooses "machine2"
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expectedHost: "machine2",
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},
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{
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// Fits on a machine where the pod ID matches the machine name
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predicates: []FitPredicate{matchesPredicate},
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prioritizer: EqualPriority,
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nodes: []string{"machine1", "machine2"},
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pod: api.Pod{TypeMeta: api.TypeMeta{ID: "machine2"}},
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expectedHost: "machine2",
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},
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{
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predicates: []FitPredicate{truePredicate},
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prioritizer: numericPriority,
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nodes: []string{"3", "2", "1"},
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expectedHost: "1",
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},
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{
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predicates: []FitPredicate{matchesPredicate},
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prioritizer: numericPriority,
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nodes: []string{"3", "2", "1"},
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pod: api.Pod{TypeMeta: api.TypeMeta{ID: "2"}},
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expectedHost: "2",
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},
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{
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predicates: []FitPredicate{truePredicate, falsePredicate},
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prioritizer: numericPriority,
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nodes: []string{"3", "2", "1"},
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expectsErr: true,
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},
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}
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for _, test := range tests {
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random := rand.New(rand.NewSource(0))
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scheduler := NewGenericScheduler(test.predicates, test.prioritizer, FakePodLister([]api.Pod{}), random)
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machine, err := scheduler.Schedule(test.pod, FakeMinionLister(makeMinionList(test.nodes)))
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if test.expectsErr {
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if err == nil {
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t.Error("Unexpected non-error")
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}
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} else {
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if err != nil {
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t.Errorf("Unexpected error: %v", err)
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}
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if test.expectedHost != machine {
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t.Errorf("Expected: %s, Saw: %s", test.expectedHost, machine)
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}
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}
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}
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}
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