mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-10 08:20:23 +00:00
5af3fe5deb
this commits add the controller runtime and its dependency to the vendor. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
110 lines
2.6 KiB
Go
110 lines
2.6 KiB
Go
/*
|
|
Copyright 2018 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 leaderelection
|
|
|
|
import (
|
|
"sync"
|
|
)
|
|
|
|
// This file provides abstractions for setting the provider (e.g., prometheus)
|
|
// of metrics.
|
|
|
|
type leaderMetricsAdapter interface {
|
|
leaderOn(name string)
|
|
leaderOff(name string)
|
|
}
|
|
|
|
// GaugeMetric represents a single numerical value that can arbitrarily go up
|
|
// and down.
|
|
type SwitchMetric interface {
|
|
On(name string)
|
|
Off(name string)
|
|
}
|
|
|
|
type noopMetric struct{}
|
|
|
|
func (noopMetric) On(name string) {}
|
|
func (noopMetric) Off(name string) {}
|
|
|
|
// defaultLeaderMetrics expects the caller to lock before setting any metrics.
|
|
type defaultLeaderMetrics struct {
|
|
// leader's value indicates if the current process is the owner of name lease
|
|
leader SwitchMetric
|
|
}
|
|
|
|
func (m *defaultLeaderMetrics) leaderOn(name string) {
|
|
if m == nil {
|
|
return
|
|
}
|
|
m.leader.On(name)
|
|
}
|
|
|
|
func (m *defaultLeaderMetrics) leaderOff(name string) {
|
|
if m == nil {
|
|
return
|
|
}
|
|
m.leader.Off(name)
|
|
}
|
|
|
|
type noMetrics struct{}
|
|
|
|
func (noMetrics) leaderOn(name string) {}
|
|
func (noMetrics) leaderOff(name string) {}
|
|
|
|
// MetricsProvider generates various metrics used by the leader election.
|
|
type MetricsProvider interface {
|
|
NewLeaderMetric() SwitchMetric
|
|
}
|
|
|
|
type noopMetricsProvider struct{}
|
|
|
|
func (_ noopMetricsProvider) NewLeaderMetric() SwitchMetric {
|
|
return noopMetric{}
|
|
}
|
|
|
|
var globalMetricsFactory = leaderMetricsFactory{
|
|
metricsProvider: noopMetricsProvider{},
|
|
}
|
|
|
|
type leaderMetricsFactory struct {
|
|
metricsProvider MetricsProvider
|
|
|
|
onlyOnce sync.Once
|
|
}
|
|
|
|
func (f *leaderMetricsFactory) setProvider(mp MetricsProvider) {
|
|
f.onlyOnce.Do(func() {
|
|
f.metricsProvider = mp
|
|
})
|
|
}
|
|
|
|
func (f *leaderMetricsFactory) newLeaderMetrics() leaderMetricsAdapter {
|
|
mp := f.metricsProvider
|
|
if mp == (noopMetricsProvider{}) {
|
|
return noMetrics{}
|
|
}
|
|
return &defaultLeaderMetrics{
|
|
leader: mp.NewLeaderMetric(),
|
|
}
|
|
}
|
|
|
|
// SetProvider sets the metrics provider for all subsequently created work
|
|
// queues. Only the first call has an effect.
|
|
func SetProvider(metricsProvider MetricsProvider) {
|
|
globalMetricsFactory.setProvider(metricsProvider)
|
|
}
|