mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-24 07:10:20 +00:00
e727bd351e
updating kubernetes to 1.30 release Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
187 lines
6.3 KiB
Go
187 lines
6.3 KiB
Go
/*
|
|
Copyright 2016 The Kubernetes Authors.
|
|
|
|
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 server
|
|
|
|
import (
|
|
"fmt"
|
|
"net/http"
|
|
"sync"
|
|
"time"
|
|
|
|
"k8s.io/apiserver/pkg/server/healthz"
|
|
"k8s.io/utils/clock"
|
|
)
|
|
|
|
// healthMux is an interface describing the methods InstallHandler requires.
|
|
type healthMux interface {
|
|
Handle(pattern string, handler http.Handler)
|
|
}
|
|
|
|
type healthCheckRegistry struct {
|
|
path string
|
|
lock sync.Mutex
|
|
checks []healthz.HealthChecker
|
|
checksInstalled bool
|
|
clock clock.Clock
|
|
}
|
|
|
|
func (reg *healthCheckRegistry) addHealthChecks(checks ...healthz.HealthChecker) error {
|
|
return reg.addDelayedHealthChecks(0, checks...)
|
|
}
|
|
|
|
func (reg *healthCheckRegistry) addDelayedHealthChecks(delay time.Duration, checks ...healthz.HealthChecker) error {
|
|
if delay > 0 && reg.clock == nil {
|
|
return fmt.Errorf("nil clock in healthCheckRegistry for %s endpoint", reg.path)
|
|
}
|
|
reg.lock.Lock()
|
|
defer reg.lock.Unlock()
|
|
if reg.checksInstalled {
|
|
return fmt.Errorf("unable to add because the %s endpoint has already been created", reg.path)
|
|
}
|
|
if delay > 0 {
|
|
for _, check := range checks {
|
|
reg.checks = append(reg.checks, delayedHealthCheck(check, reg.clock, delay))
|
|
}
|
|
} else {
|
|
reg.checks = append(reg.checks, checks...)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (reg *healthCheckRegistry) installHandler(mux healthMux) {
|
|
reg.installHandlerWithHealthyFunc(mux, nil)
|
|
}
|
|
|
|
func (reg *healthCheckRegistry) installHandlerWithHealthyFunc(mux healthMux, firstTimeHealthy func()) {
|
|
reg.lock.Lock()
|
|
defer reg.lock.Unlock()
|
|
reg.checksInstalled = true
|
|
healthz.InstallPathHandlerWithHealthyFunc(mux, reg.path, firstTimeHealthy, reg.checks...)
|
|
}
|
|
|
|
// AddHealthChecks adds HealthCheck(s) to health endpoints (healthz, livez, readyz) but
|
|
// configures the liveness grace period to be zero, which means we expect this health check
|
|
// to immediately indicate that the apiserver is unhealthy.
|
|
func (s *GenericAPIServer) AddHealthChecks(checks ...healthz.HealthChecker) error {
|
|
// we opt for a delay of zero here, because this entrypoint adds generic health checks
|
|
// and not health checks which are specifically related to kube-apiserver boot-sequences.
|
|
return s.addHealthChecks(0, checks...)
|
|
}
|
|
|
|
// AddBootSequenceHealthChecks adds health checks to the old healthz endpoint (for backwards compatibility reasons)
|
|
// as well as livez and readyz. The livez grace period is defined by the value of the
|
|
// command-line flag --livez-grace-period; before the grace period elapses, the livez health checks
|
|
// will default to healthy. One may want to set a grace period in order to prevent the kubelet from restarting
|
|
// the kube-apiserver due to long-ish boot sequences. Readyz health checks, on the other hand, have no grace period,
|
|
// since readyz should fail until boot fully completes.
|
|
func (s *GenericAPIServer) AddBootSequenceHealthChecks(checks ...healthz.HealthChecker) error {
|
|
return s.addHealthChecks(s.livezGracePeriod, checks...)
|
|
}
|
|
|
|
// addHealthChecks adds health checks to healthz, livez, and readyz. The delay passed in will set
|
|
// a corresponding grace period on livez.
|
|
func (s *GenericAPIServer) addHealthChecks(livezGracePeriod time.Duration, checks ...healthz.HealthChecker) error {
|
|
if err := s.healthzRegistry.addHealthChecks(checks...); err != nil {
|
|
return err
|
|
}
|
|
if err := s.livezRegistry.addDelayedHealthChecks(livezGracePeriod, checks...); err != nil {
|
|
return err
|
|
}
|
|
return s.readyzRegistry.addHealthChecks(checks...)
|
|
}
|
|
|
|
// AddReadyzChecks allows you to add a HealthCheck to readyz.
|
|
func (s *GenericAPIServer) AddReadyzChecks(checks ...healthz.HealthChecker) error {
|
|
return s.readyzRegistry.addHealthChecks(checks...)
|
|
}
|
|
|
|
// AddLivezChecks allows you to add a HealthCheck to livez.
|
|
func (s *GenericAPIServer) AddLivezChecks(delay time.Duration, checks ...healthz.HealthChecker) error {
|
|
return s.livezRegistry.addDelayedHealthChecks(delay, checks...)
|
|
}
|
|
|
|
// addReadyzShutdownCheck is a convenience function for adding a readyz shutdown check, so
|
|
// that we can register that the api-server is no longer ready while we attempt to gracefully
|
|
// shutdown.
|
|
func (s *GenericAPIServer) addReadyzShutdownCheck(stopCh <-chan struct{}) error {
|
|
return s.AddReadyzChecks(shutdownCheck{stopCh})
|
|
}
|
|
|
|
// installHealthz creates the healthz endpoint for this server
|
|
func (s *GenericAPIServer) installHealthz() {
|
|
s.healthzRegistry.installHandler(s.Handler.NonGoRestfulMux)
|
|
}
|
|
|
|
// installReadyz creates the readyz endpoint for this server.
|
|
func (s *GenericAPIServer) installReadyz() {
|
|
s.readyzRegistry.installHandlerWithHealthyFunc(s.Handler.NonGoRestfulMux, func() {
|
|
// note: installHandlerWithHealthyFunc guarantees that this is called only once
|
|
s.lifecycleSignals.HasBeenReady.Signal()
|
|
})
|
|
}
|
|
|
|
// installLivez creates the livez endpoint for this server.
|
|
func (s *GenericAPIServer) installLivez() {
|
|
s.livezRegistry.installHandler(s.Handler.NonGoRestfulMux)
|
|
}
|
|
|
|
// shutdownCheck fails if the embedded channel is closed. This is intended to allow for graceful shutdown sequences
|
|
// for the apiserver.
|
|
type shutdownCheck struct {
|
|
StopCh <-chan struct{}
|
|
}
|
|
|
|
func (shutdownCheck) Name() string {
|
|
return "shutdown"
|
|
}
|
|
|
|
func (c shutdownCheck) Check(req *http.Request) error {
|
|
select {
|
|
case <-c.StopCh:
|
|
return fmt.Errorf("process is shutting down")
|
|
default:
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// delayedHealthCheck wraps a health check which will not fail until the explicitly defined delay has elapsed. This
|
|
// is intended for use primarily for livez health checks.
|
|
func delayedHealthCheck(check healthz.HealthChecker, clock clock.Clock, delay time.Duration) healthz.HealthChecker {
|
|
return delayedLivezCheck{
|
|
check,
|
|
clock.Now().Add(delay),
|
|
clock,
|
|
}
|
|
}
|
|
|
|
type delayedLivezCheck struct {
|
|
check healthz.HealthChecker
|
|
startCheck time.Time
|
|
clock clock.Clock
|
|
}
|
|
|
|
func (c delayedLivezCheck) Name() string {
|
|
return c.check.Name()
|
|
}
|
|
|
|
func (c delayedLivezCheck) Check(req *http.Request) error {
|
|
if c.clock.Now().After(c.startCheck) {
|
|
return c.check.Check(req)
|
|
}
|
|
return nil
|
|
}
|