forked from knative/pkg
/
prometheus_exporter.go
74 lines (66 loc) · 1.9 KB
/
prometheus_exporter.go
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/*
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
}