954996e231
- Move from the old github.com/golang/glog to k8s.io/klog - klog as explicit InitFlags() so we add them as necessary - we update the other repositories that we vendor that made a similar change from glog to klog * github.com/kubernetes/repo-infra * k8s.io/gengo/ * k8s.io/kube-openapi/ * github.com/google/cadvisor - Entirely remove all references to glog - Fix some tests by explicit InitFlags in their init() methods Change-Id: I92db545ff36fcec83afe98f550c9e630098b3135
83 lines
2.7 KiB
Go
83 lines
2.7 KiB
Go
/*
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Copyright 2016 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 services
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import (
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"fmt"
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"k8s.io/klog"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"time"
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)
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// terminationSignals are signals that cause the program to exit in the
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// supported platforms (linux, darwin, windows).
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var terminationSignals = []os.Signal{syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT}
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// waitForTerminationSignal waits for termination signal.
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func waitForTerminationSignal() {
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sig := make(chan os.Signal, 1)
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signal.Notify(sig, terminationSignals...)
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<-sig
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}
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// readinessCheck checks whether services are ready via the supplied health
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// check URLs. Once there is an error in errCh, the function will stop waiting
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// and return the error.
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func readinessCheck(name string, urls []string, errCh <-chan error) error {
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klog.Infof("Running readiness check for service %q", name)
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endTime := time.Now().Add(*serverStartTimeout)
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blockCh := make(chan error)
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defer close(blockCh)
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for endTime.After(time.Now()) {
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select {
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// We *always* want to run the health check if there is no error on the channel.
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// With systemd, reads from errCh report nil because cmd.Run() waits
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// on systemd-run, rather than the service process. systemd-run quickly
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// exits with status 0, causing the channel to be closed with no error. In
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// this case, you want to wait for the health check to complete, rather
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// than returning from readinessCheck as soon as the channel is closed.
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case err, ok := <-errCh:
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if ok { // The channel is not closed, this is a real error
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if err != nil { // If there is an error, return it
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return err
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}
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// If not, keep checking readiness.
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} else { // The channel is closed, this is only a zero value.
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// Replace the errCh with blockCh to avoid busy loop,
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// and keep checking readiness.
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errCh = blockCh
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}
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case <-time.After(time.Second):
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ready := true
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for _, url := range urls {
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resp, err := http.Head(url)
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if err != nil || resp.StatusCode != http.StatusOK {
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ready = false
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break
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}
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}
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if ready {
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return nil
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}
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}
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}
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return fmt.Errorf("e2e service %q readiness check timeout %v", name, *serverStartTimeout)
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}
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