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mq_exporter.go
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/
mq_exporter.go
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// Copyright 2021-2022 Andreas Gebhardt
//
// 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
//
// https://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 (
"context"
versionc "github.com/prometheus/client_golang/prometheus/collectors/version"
"io"
"net/http"
"os"
"os/signal"
"syscall"
"github.com/agebhar1/mq_exporter/collector"
"github.com/agebhar1/mq_exporter/mq"
"github.com/alecthomas/kingpin/v2"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"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"
webflag "github.com/prometheus/exporter-toolkit/web/kingpinflag"
)
var name = "mq_exporter"
type appCtx struct {
logger log.Logger
sigs chan os.Signal
configFile *string
toolkitFlags *web.FlagConfig
webTelemetryPath *string
}
func newAppCtx(args []string, usageWriter io.Writer, errorWriter io.Writer, logger log.Logger) *appCtx {
ctx := appCtx{}
var app = kingpin.New(name, "A Prometheus exporter for MQ metrics.")
ctx.configFile = app.Flag("config", "Path to config yaml file for MQ connections.").Required().String()
ctx.toolkitFlags = webflag.AddFlags(app, ":9873")
ctx.webTelemetryPath = app.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
app.UsageWriter(usageWriter)
app.ErrorWriter(errorWriter)
app.Version(version.Print(app.Name))
app.HelpFlag.Short('h')
app.VersionFlag.Short('v')
promlogConfig := &promlog.Config{}
flag.AddFlags(app, promlogConfig)
kingpin.MustParse(app.Parse(args))
if logger != nil {
ctx.logger = logger
} else {
ctx.logger = promlog.New(promlogConfig)
}
ctx.sigs = make(chan os.Signal)
signal.Notify(ctx.sigs, syscall.SIGINT, syscall.SIGTERM)
return &ctx
}
func (app *appCtx) run() int {
logInfo := level.Info(app.logger).Log
logError := level.Error(app.logger).Log
logInfo("msg", "Starting", "app_name", name, "version", version.Version, "branch", version.Branch, "revision", version.Revision)
logInfo("msg", "Build context", "go", version.GoVersion, "build_user", version.BuildUser, "build_date", version.BuildDate)
reg := prometheus.NewRegistry()
reg.MustRegister(versionc.NewCollector(name))
reg.MustRegister(collectors.NewGoCollector())
reg.MustRegister(collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}))
mqConnection, err := mq.NewMqConnection(app.logger, *app.configFile)
if err != nil {
logError("msg", err)
return 1
}
collector := collector.NewQueueCollector(app.logger, mqConnection.Timeout(), mqConnection.Queues())
reg.MustRegister(collector)
handler := http.NewServeMux()
handler.Handle(*app.webTelemetryPath, promhttp.InstrumentMetricHandler(
reg, promhttp.HandlerFor(reg, promhttp.HandlerOpts{}),
))
handler.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
w.Write([]byte(`<html>
<head><title>MQ Exporter</title></head>
<body>
<h1>MQ Exporter</h1>
<p><a href='` + *app.webTelemetryPath + `'>Metrics</a></p>
</body>
</html>`))
})
server := &http.Server{Handler: handler}
go func() {
<-app.sigs
mqConnection.Close()
logInfo("msg", "Shutdown server.")
server.Shutdown(context.Background())
}()
if err := web.ListenAndServe(server, app.toolkitFlags, app.logger); err != http.ErrServerClosed {
logError("msg", "Serve error", "err", err)
return 2
}
return 0
}
func main() {
os.Exit(newAppCtx(os.Args[1:], os.Stdout, os.Stderr, nil).run())
}