gnvoerk

Corefile

@@ -0,0 +1,10 @@
+.:9999 {
+    reload 2s
+    log
+	errors
+	dnsstat
+
+    prometheus 0.0.0.0:51273
+
+    forward . 1.1.1.1
+}

dnsstat.go

@@ -8,6 +8,8 @@ import (
 	"github.com/coredns/coredns/plugin"
 	"github.com/coredns/coredns/plugin/metrics"
 	"github.com/coredns/coredns/request"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
 
 	"github.com/miekg/dns"
 )
@@ -19,6 +21,7 @@ type DNSStat struct {
 
 func init() { plugin.Register("dnsstat", setup) }
 
+// Register
 func setup(c *caddy.Controller) error {
 	for c.Next() {
 		if c.NextArg() {
@@ -33,6 +36,21 @@ func setup(c *caddy.Controller) error {
 	return nil
 }
 
+// Metrics counter
+var requestCount = promauto.NewCounterVec(prometheus.CounterOpts{
+	Namespace: plugin.Namespace,
+	Subsystem: "dnsstat",
+	Name:      "dnsstat_request_count_total",
+	Help:      "Counter of requests made.",
+}, []string{
+	"server",
+	"zone",
+	"class",
+	"type",
+	"name",
+	"client_ip",
+})
+
 // ServeDNS implements the plugin.Handler interface.
 func (d DNSStat) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
 	state := request.Request{W: w, Req: r}

metrics.go

@@ -1,27 +0,0 @@
-package dnsstat
-
-import (
-	"sync"
-
-	"github.com/coredns/coredns/plugin"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
-)
-
-// Track total requests made to given domain name + misc
-var requestCount = promauto.NewCounterVec(prometheus.CounterOpts{
-	Namespace: plugin.Namespace,
-	Subsystem: "dnsstat",
-	Name:      "dnsstat_request_count_total",
-	Help:      "Counter of requests made.",
-}, []string{
-	"server",
-	"zone",
-	"class",
-	"type",
-	"name",
-	"client_ip",
-})
-
-var once sync.Once