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main.go
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main.go
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/*
Copyright 2023 The Pipeline Service 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 main
import (
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/openshift-pipelines/pipeline-service-exporter/collector"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/promlog"
"github.com/prometheus/common/promlog/flag"
"github.com/prometheus/common/version"
"github.com/prometheus/exporter-toolkit/web"
"github.com/prometheus/exporter-toolkit/web/kingpinflag"
"gopkg.in/alecthomas/kingpin.v2"
"net/http"
_ "net/http/pprof"
"os"
"os/signal"
"sync"
"syscall"
"time"
)
var (
listenAddress = kingpin.Flag("telemetry.address", "Address at which pipeline-service metrics are exported.").Default(".9117").String()
metricsPath = kingpin.Flag("telemetry-path", "Path at which pipeline-service metrics are exported.").Default("/metrics").String()
toolkitFlags = kingpinflag.AddFlags(kingpin.CommandLine, ":9117")
logger log.Logger
promlogConfig *promlog.Config
)
const (
exporterName = "pipeline_service_exporter"
)
func init() {
promlogConfig = &promlog.Config{}
logger = promlog.New(promlogConfig)
}
func main() {
var wg sync.WaitGroup
wg.Add(1)
flag.AddFlags(kingpin.CommandLine, promlogConfig)
kingpin.Version(version.Print(exporterName))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
level.Info(logger).Log("msg", "Starting pipeline_service_exporter", "version", version.Info())
level.Info(logger).Log("msg", "Build context", "build", version.BuildContext())
level.Info(logger).Log("msg", "Starting Server: ", "listen_address", *listenAddress)
prometheus.MustRegister(version.NewCollector(exporterName))
psCollector, err := collector.NewCollector(logger)
if err != nil {
level.Error(logger).Log("msg", "Couldn't create collector", "error", err)
os.Exit(1)
}
prometheus.MustRegister(psCollector)
// Define a channel to watch out for any termination signals
gracefulStop := make(chan os.Signal, 1)
signal.Notify(gracefulStop, syscall.SIGINT, syscall.SIGTERM)
// Listen for the termination signals from the OS
go func() {
level.Info(logger).Log("msg", "Listening and waiting for graceful stop")
sig := <-gracefulStop
level.Info(logger).Log("msg", "Caught signal: %+v. Waiting 2 seconds...", "signal", sig)
time.Sleep(2 * time.Second)
level.Info(logger).Log("msg", "Terminating pipeline_service_exporter on port: ", "listen_address", *listenAddress)
os.Exit(0)
}()
// Start the server
StartServer()
}
func StartServer() {
// Define paths
http.Handle(*metricsPath, promhttp.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Pipeline Exporter</title></head>
<body>
<h1>Pipeline Exporter</h1>
<p><a href='` + *metricsPath + `'>Metrics</a></p>
</body>
</html>`))
})
// Start the server
srv := &http.Server{Addr: *listenAddress}
if err := web.ListenAndServe(srv, toolkitFlags, logger); err != nil {
level.Error(logger).Log("error", "Port Listen Address error", "reason", err)
os.Exit(1)
}
}