73 lines
2.5 KiB
Go
73 lines
2.5 KiB
Go
package main
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import (
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"context"
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"log"
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"net/http"
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"os"
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"github.com/alecthomas/kingpin"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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func main() {
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var (
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app = kingpin.New("postfix_exporter", "Prometheus metrics exporter for postfix")
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listenAddress = app.Flag("web.listen-address", "Address to listen on for web interface and telemetry.").Default(":9154").String()
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metricsPath = app.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
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postfixShowqPath = app.Flag("postfix.showq_path", "Path at which Postfix places its showq socket.").Default("/var/spool/postfix/public/showq").String()
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postfixLogfilePath = app.Flag("postfix.logfile_path", "Path where Postfix writes log entries. This file will be truncated by this exporter.").Default("/var/log/postfix_exporter_input.log").String()
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logUnsupportedLines = app.Flag("log.unsupported", "Log all unsupported lines.").Bool()
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systemdEnable bool
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systemdUnit, systemdSlice, systemdJournalPath string
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)
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systemdFlags(&systemdEnable, &systemdUnit, &systemdSlice, &systemdJournalPath, app)
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kingpin.MustParse(app.Parse(os.Args[1:]))
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var journal *Journal
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if systemdEnable {
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var err error
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journal, err = NewJournal(systemdUnit, systemdSlice, systemdJournalPath)
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if err != nil {
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log.Fatalf("Error opening systemd journal: %s", err)
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}
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defer journal.Close()
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log.Println("Reading log events from systemd")
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} else {
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log.Printf("Reading log events from %v", *postfixLogfilePath)
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}
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exporter, err := NewPostfixExporter(
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*postfixShowqPath,
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*postfixLogfilePath,
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journal,
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*logUnsupportedLines,
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)
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if err != nil {
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log.Fatalf("Failed to create PostfixExporter: %s", err)
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}
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prometheus.MustRegister(exporter)
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http.Handle(*metricsPath, promhttp.Handler())
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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_, err = w.Write([]byte(`
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<html>
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<head><title>Postfix Exporter</title></head>
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<body>
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<h1>Postfix Exporter</h1>
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<p><a href='` + *metricsPath + `'>Metrics</a></p>
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</body>
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</html>`))
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if err != nil {
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panic(err)
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}
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})
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ctx, cancelFunc := context.WithCancel(context.Background())
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defer cancelFunc()
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go exporter.StartMetricCollection(ctx)
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log.Print("Listening on ", *listenAddress)
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log.Fatal(http.ListenAndServe(*listenAddress, nil))
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}
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