115 lines
3.6 KiB
Go
115 lines
3.6 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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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 service
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import (
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"fmt"
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"net"
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"strconv"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/kubernetes/test/e2e/framework"
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)
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// CheckAffinity function tests whether the service affinity works as expected.
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// If affinity is expected, the test will return true once affinityConfirmCount
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// number of same response observed in a row. If affinity is not expected, the
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// test will keep observe until different responses observed. The function will
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// return false only in case of unexpected errors.
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func CheckAffinity(execPod *v1.Pod, serviceIP string, servicePort int, shouldHold bool) bool {
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serviceIPPort := net.JoinHostPort(serviceIP, strconv.Itoa(servicePort))
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cmd := fmt.Sprintf(`curl -q -s --connect-timeout 2 http://%s/`, serviceIPPort)
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timeout := AffinityTimeout
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if execPod == nil {
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timeout = LoadBalancerPollTimeout
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}
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var tracker affinityTracker
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if pollErr := wait.PollImmediate(framework.Poll, timeout, func() (bool, error) {
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if execPod != nil {
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stdout, err := framework.RunHostCmd(execPod.Namespace, execPod.Name, cmd)
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if err != nil {
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framework.Logf("Failed to get response from %s. Retry until timeout", serviceIPPort)
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return false, nil
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}
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tracker.recordHost(stdout)
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} else {
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rawResponse := GetHTTPContent(serviceIP, servicePort, timeout, "")
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tracker.recordHost(rawResponse.String())
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}
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trackerFulfilled, affinityHolds := tracker.checkHostTrace(AffinityConfirmCount)
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if !shouldHold && !affinityHolds {
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return true, nil
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}
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if shouldHold && trackerFulfilled && affinityHolds {
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return true, nil
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}
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return false, nil
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}); pollErr != nil {
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trackerFulfilled, _ := tracker.checkHostTrace(AffinityConfirmCount)
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if pollErr != wait.ErrWaitTimeout {
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checkAffinityFailed(tracker, pollErr.Error())
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return false
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}
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if !trackerFulfilled {
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checkAffinityFailed(tracker, fmt.Sprintf("Connection to %s timed out or not enough responses.", serviceIPPort))
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}
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if shouldHold {
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checkAffinityFailed(tracker, "Affinity should hold but didn't.")
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} else {
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checkAffinityFailed(tracker, "Affinity shouldn't hold but did.")
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}
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return true
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}
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return true
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}
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// affinityTracker tracks the destination of a request for the affinity tests.
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type affinityTracker struct {
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hostTrace []string
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}
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// Record the response going to a given host.
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func (at *affinityTracker) recordHost(host string) {
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at.hostTrace = append(at.hostTrace, host)
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framework.Logf("Received response from host: %s", host)
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}
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// Check that we got a constant count requests going to the same host.
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func (at *affinityTracker) checkHostTrace(count int) (fulfilled, affinityHolds bool) {
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fulfilled = (len(at.hostTrace) >= count)
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if len(at.hostTrace) == 0 {
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return fulfilled, true
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}
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last := at.hostTrace[0:]
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if len(at.hostTrace)-count >= 0 {
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last = at.hostTrace[len(at.hostTrace)-count:]
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}
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host := at.hostTrace[len(at.hostTrace)-1]
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for _, h := range last {
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if h != host {
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return fulfilled, false
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}
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}
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return fulfilled, true
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}
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func checkAffinityFailed(tracker affinityTracker, err string) {
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framework.Logf("%v", tracker.hostTrace)
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framework.Failf(err)
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}
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