/
healthzadaptor.go
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/
healthzadaptor.go
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/*
* Tencent is pleased to support the open source community by making TKEStack
* available.
*
* Copyright (C) 2012-2019 Tencent. 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
*
* https://opensource.org/licenses/Apache-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 OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
// Portions Copyright 2014 The Kubernetes Authors. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package leaderelection
import (
"net/http"
"sync"
"time"
)
// HealthzAdaptor associates the /healthz endpoint with the LeaderElection object.
// It helps deal with the /healthz endpoint being set up prior to the LeaderElection.
// This contains the code needed to act as an adaptor between the leader
// election code the health check code. It allows us to provide health
// status about the leader election. Most specifically about if the leader
// has failed to renew without exiting the process. In that case we should
// report not healthy and rely on the kubelet to take down the process.
type HealthzAdaptor struct {
pointerLock sync.Mutex
le *LeaderElector
timeout time.Duration
}
// Name returns the name of the health check we are implementing.
func (l *HealthzAdaptor) Name() string {
return "leaderElection"
}
// Check is called by the healthz endpoint handler.
// It fails (returns an error) if we own the lease but had not been able to renew it.
func (l *HealthzAdaptor) Check(req *http.Request) error {
l.pointerLock.Lock()
defer l.pointerLock.Unlock()
if l.le == nil {
return nil
}
return l.le.Check(l.timeout)
}
// SetLeaderElection ties a leader election object to a HealthzAdaptor
func (l *HealthzAdaptor) SetLeaderElection(le *LeaderElector) {
l.pointerLock.Lock()
defer l.pointerLock.Unlock()
l.le = le
}
// NewLeaderHealthzAdaptor creates a basic healthz adaptor to monitor a leader election.
// timeout determines the time beyond the lease expiry to be allowed for timeout.
// checks within the timeout period after the lease expires will still return healthy.
func NewLeaderHealthzAdaptor(timeout time.Duration) *HealthzAdaptor {
result := &HealthzAdaptor{
timeout: timeout,
}
return result
}