Merge pull request #5 from brancz/master

Bring in latest upstream changes

VERSION

@@ -1 +1 @@
-v0.3.0
+v0.4.0

go.mod

@@ -2,6 +2,9 @@ module github.com/rhobs/prometheus-example-app
 
 go 1.13
 
-require github.com/prometheus/client_golang v1.3.0
+require (
+	github.com/prometheus/client_golang v1.3.0
+	golang.org/x/net v0.0.0-20190613194153-d28f0bde5980
+)
 
 replace github.com/prometheus/client_golang => github.com/prometheus/client_golang v1.3.0

go.sum

@@ -40,13 +40,15 @@ github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190613194153-d28f0bde5980 h1:dfGZHvZk057jK2MCeWus/TowKpJ8y4AmooUzdBSR9GU=
 golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191220142924-d4481acd189f h1:68K/z8GLUxV76xGSqwTWw2gyk/jwn79LUL43rES2g8o=
 golang.org/x/sys v0.0.0-20191220142924-d4481acd189f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

main.go

@@ -8,11 +8,13 @@ import (
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/h2c"
 )
 
 var (
 	appVersion string
-	version = prometheus.NewGauge(prometheus.GaugeOpts{
+	version    = prometheus.NewGauge(prometheus.GaugeOpts{
 		Name: "version",
 		Help: "Version information about this binary",
 		ConstLabels: map[string]string{
@@ -34,8 +36,10 @@ var (
 func main() {
 	version.Set(1)
 	bind := ""
+	enableH2c := false
 	flagset := flag.NewFlagSet(os.Args[0], flag.ExitOnError)
 	flagset.StringVar(&bind, "bind", ":8080", "The socket to bind to.")
+	flagset.BoolVar(&enableH2c, "h2c", false, "Enable h2c (http/2 over tcp) protocol.")
 	flagset.Parse(os.Args[1:])
 
 	r := prometheus.NewRegistry()
@@ -56,9 +60,17 @@ func main() {
 		promhttp.InstrumentHandlerCounter(httpRequestsTotal, foundHandler),
 	)
 
-	http.Handle("/", foundChain)
-	http.Handle("/err", promhttp.InstrumentHandlerCounter(httpRequestsTotal, notfoundHandler))
+	mux := http.NewServeMux()
+	mux.Handle("/", foundChain)
+	mux.Handle("/err", promhttp.InstrumentHandlerCounter(httpRequestsTotal, notfoundHandler))
+	mux.Handle("/metrics", promhttp.HandlerFor(r, promhttp.HandlerOpts{}))
 
-	http.Handle("/metrics", promhttp.HandlerFor(r, promhttp.HandlerOpts{}))
-	log.Fatal(http.ListenAndServe(bind, nil))
+	var srv *http.Server
+	if enableH2c {
+		srv = &http.Server{Addr: bind, Handler: h2c.NewHandler(mux, &http2.Server{})}
+	} else {
+		srv = &http.Server{Addr: bind, Handler: mux}
+	}
+
+	log.Fatal(srv.ListenAndServe())
 }