From 55f7e71b1e324a01a770b5d9ab7bb63ade3dd7c7 Mon Sep 17 00:00:00 2001
From: WilliButz <wbutz@cyberfnord.de>
Date: Sun, 6 May 2018 15:13:33 +0200
Subject: [PATCH] add log output and use the prometheus log library

---
 dnsmasq.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dnsmasq.go b/dnsmasq.go
index c784ff9..2f74278 100644
--- a/dnsmasq.go
+++ b/dnsmasq.go
@@ -19,7 +19,6 @@ import (
 	"bufio"
 	"flag"
 	"fmt"
-	"log"
 	"net/http"
 	"os"
 	"strconv"
@@ -29,6 +28,7 @@ import (
 	"github.com/miekg/dns"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"github.com/prometheus/common/log"
 )
 
 var (
@@ -163,6 +163,7 @@ func (s *server) metrics(w http.ResponseWriter, r *http.Request) {
 	eg.Go(func() error {
 		f, err := os.Open(s.leasesPath)
 		if err != nil {
+			log.Warnln("could not open leases file:", err)
 			return err
 		}
 		defer f.Close()
@@ -205,5 +206,7 @@ func main() {
 			<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))
 }