mirror of https://github.com/knative/caching.git
78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
/*
|
|
Copyright 2019 The Knative 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"
|
|
"net/http"
|
|
"sync"
|
|
|
|
"contrib.go.opencensus.io/exporter/prometheus"
|
|
"go.opencensus.io/stats/view"
|
|
"go.uber.org/zap"
|
|
)
|
|
|
|
var (
|
|
curPromSrv *http.Server
|
|
curPromSrvMux sync.Mutex
|
|
)
|
|
|
|
func newPrometheusExporter(config *metricsConfig, logger *zap.SugaredLogger) (view.Exporter, error) {
|
|
e, err := prometheus.NewExporter(prometheus.Options{Namespace: config.component})
|
|
if err != nil {
|
|
logger.Errorw("Failed to create the Prometheus exporter.", zap.Error(err))
|
|
return nil, err
|
|
}
|
|
logger.Infof("Created Opencensus Prometheus exporter with config: %v. Start the server for Prometheus exporter.", config)
|
|
// Start the server for Prometheus scraping
|
|
go func() {
|
|
srv := startNewPromSrv(e, config.prometheusPort)
|
|
srv.ListenAndServe()
|
|
}()
|
|
return e, nil
|
|
}
|
|
|
|
func getCurPromSrv() *http.Server {
|
|
curPromSrvMux.Lock()
|
|
defer curPromSrvMux.Unlock()
|
|
return curPromSrv
|
|
}
|
|
|
|
func resetCurPromSrv() {
|
|
curPromSrvMux.Lock()
|
|
defer curPromSrvMux.Unlock()
|
|
if curPromSrv != nil {
|
|
curPromSrv.Close()
|
|
curPromSrv = nil
|
|
}
|
|
}
|
|
|
|
func startNewPromSrv(e *prometheus.Exporter, port int) *http.Server {
|
|
sm := http.NewServeMux()
|
|
sm.Handle("/metrics", e)
|
|
curPromSrvMux.Lock()
|
|
defer curPromSrvMux.Unlock()
|
|
if curPromSrv != nil {
|
|
curPromSrv.Close()
|
|
}
|
|
curPromSrv = &http.Server{
|
|
Addr: fmt.Sprintf(":%v", port),
|
|
Handler: sm,
|
|
}
|
|
return curPromSrv
|
|
}
|