mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-10 08:20:23 +00:00
100 lines
2.8 KiB
Go
100 lines
2.8 KiB
Go
/*
|
|
Copyright 2015 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 metrics
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
"time"
|
|
|
|
"k8s.io/apimachinery/pkg/util/wait"
|
|
"k8s.io/client-go/util/flowcontrol"
|
|
|
|
"github.com/golang/glog"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
const (
|
|
updatePeriod = 5 * time.Second
|
|
)
|
|
|
|
var (
|
|
metricsLock sync.Mutex
|
|
rateLimiterMetrics = make(map[string]rateLimiterMetric)
|
|
)
|
|
|
|
type rateLimiterMetric struct {
|
|
metric prometheus.Gauge
|
|
stopCh chan struct{}
|
|
}
|
|
|
|
func registerRateLimiterMetric(ownerName string) error {
|
|
metricsLock.Lock()
|
|
defer metricsLock.Unlock()
|
|
|
|
if _, ok := rateLimiterMetrics[ownerName]; ok {
|
|
return fmt.Errorf("Rate Limiter Metric for %v already registered", ownerName)
|
|
}
|
|
metric := prometheus.NewGauge(prometheus.GaugeOpts{
|
|
Name: "rate_limiter_use",
|
|
Subsystem: ownerName,
|
|
Help: fmt.Sprintf("A metric measuring the saturation of the rate limiter for %v", ownerName),
|
|
})
|
|
if err := prometheus.Register(metric); err != nil {
|
|
return fmt.Errorf("error registering rate limiter usage metric: %v", err)
|
|
}
|
|
stopCh := make(chan struct{})
|
|
rateLimiterMetrics[ownerName] = rateLimiterMetric{
|
|
metric: metric,
|
|
stopCh: stopCh,
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// RegisterMetricAndTrackRateLimiterUsage registers a metric ownerName_rate_limiter_use in prometheus to track
|
|
// how much used rateLimiter is and starts a goroutine that updates this metric every updatePeriod
|
|
func RegisterMetricAndTrackRateLimiterUsage(ownerName string, rateLimiter flowcontrol.RateLimiter) error {
|
|
if err := registerRateLimiterMetric(ownerName); err != nil {
|
|
return err
|
|
}
|
|
go wait.Until(func() {
|
|
metricsLock.Lock()
|
|
defer metricsLock.Unlock()
|
|
rateLimiterMetrics[ownerName].metric.Set(rateLimiter.Saturation())
|
|
}, updatePeriod, rateLimiterMetrics[ownerName].stopCh)
|
|
return nil
|
|
}
|
|
|
|
// UnregisterMetricAndUntrackRateLimiterUsage unregisters a metric ownerName_rate_limiter_use from prometheus and
|
|
// stops the goroutine that updates this metric
|
|
func UnregisterMetricAndUntrackRateLimiterUsage(ownerName string) bool {
|
|
metricsLock.Lock()
|
|
defer metricsLock.Unlock()
|
|
|
|
rlm, ok := rateLimiterMetrics[ownerName]
|
|
if !ok {
|
|
glog.Warningf("Rate Limiter Metric for %v not registered", ownerName)
|
|
return false
|
|
}
|
|
|
|
close(rlm.stopCh)
|
|
prometheus.Unregister(rlm.metric)
|
|
delete(rateLimiterMetrics, ownerName)
|
|
|
|
return true
|
|
}
|