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Merge pull request #2 from WilliButz/add-features

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add basic landing page, configurable metrics path and more log output
This commit is contained in:
Michael Stapelberg 2018-05-06 17:33:50 +02:00 committed by GitHub
commit 14cdb8f33e
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1 changed files with 16 additions and 2 deletions
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18
dnsmasq.go
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@ -19,7 +19,6 @@ import (
"bufio" "bufio"
"flag" "flag"
"fmt" "fmt"
"log"
"net/http" "net/http"
"os" "os"
"strconv" "strconv"
@ -29,6 +28,7 @@ import (
"github.com/miekg/dns" "github.com/miekg/dns"
"github.com/prometheus/client_golang/prometheus" "github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp" "github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/log"
) )
var ( var (
@ -43,6 +43,9 @@ var (
dnsmasqAddr = flag.String("dnsmasq", dnsmasqAddr = flag.String("dnsmasq",
"localhost:53", "localhost:53",
"dnsmasq host:port address") "dnsmasq host:port address")
metricsPath = flag.String("metrics_path",
"/metrics",
"path under which metrics are served")
) )
var ( var (
@ -160,6 +163,7 @@ func (s *server) metrics(w http.ResponseWriter, r *http.Request) {
eg.Go(func() error { eg.Go(func() error {
f, err := os.Open(s.leasesPath) f, err := os.Open(s.leasesPath)
if err != nil { if err != nil {
log.Warnln("could not open leases file:", err)
return err return err
} }
defer f.Close() defer f.Close()
@ -193,6 +197,16 @@ func main() {
dnsmasqAddr: *dnsmasqAddr, dnsmasqAddr: *dnsmasqAddr,
leasesPath: *leasesPath, leasesPath: *leasesPath,
} }
http.HandleFunc("/metrics", s.metrics) http.HandleFunc(*metricsPath, s.metrics)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Dnsmasq Exporter</title></head>
<body>
<h1>Dnsmasq Exporter</h1>
<p><a href="` + *metricsPath + `">Metrics</a></p>
</body></html>`))
})
log.Infoln("Listening on", *listen)
log.Infoln("Serving metrics under", *metricsPath)
log.Fatal(http.ListenAndServe(*listen, nil)) log.Fatal(http.ListenAndServe(*listen, nil))
} }