Add Iris example in /examples

Signed-off-by: Xabier Larrakoetxea <me@slok.dev>

Author: slok

examples/iris/main.go

@@ -0,0 +1,73 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/kataras/iris/v12"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	metrics "github.com/slok/go-http-metrics/metrics/prometheus"
+	"github.com/slok/go-http-metrics/middleware"
+	irismiddleware "github.com/slok/go-http-metrics/middleware/iris"
+)
+
+const (
+	srvAddr     = ":8080"
+	metricsAddr = ":8081"
+)
+
+func main() {
+	// Create our middleware.
+	mdlw := middleware.New(middleware.Config{
+		Recorder: metrics.NewRecorder(metrics.Config{}),
+	})
+
+	// Create Iris engine and global middleware.
+	app := iris.New()
+	app.Use(irismiddleware.Handler("", mdlw))
+
+	// Add our handler.
+	app.Get("/", func(ctx iris.Context) {
+		ctx.StatusCode(iris.StatusAccepted)
+		_, _ = ctx.WriteString("Hello world!")
+	})
+
+	app.Get("/json", func(ctx iris.Context) {
+		ctx.JSON(map[string]string{"hello": "world"}) // nolint: errcheck
+	})
+
+	app.Get("/wrong", func(ctx iris.Context) {
+		ctx.StatusCode(iris.StatusTooManyRequests)
+		_, _ = ctx.WriteString("oops")
+
+	})
+
+	err := app.Build()
+	if err != nil {
+		panic(err)
+	}
+
+	// Serve our handler.
+	go func() {
+		log.Printf("server listening at %s", srvAddr)
+		if err := http.ListenAndServe(srvAddr, app); err != nil {
+			log.Panicf("error while serving: %s", err)
+		}
+	}()
+
+	// Serve our metrics.
+	go func() {
+		log.Printf("metrics listening at %s", metricsAddr)
+		if err := http.ListenAndServe(metricsAddr, promhttp.Handler()); err != nil {
+			log.Panicf("error while serving metrics: %s", err)
+		}
+	}()
+
+	// Wait until some signal is captured.
+	sigC := make(chan os.Signal, 1)
+	signal.Notify(sigC, syscall.SIGTERM, syscall.SIGINT)
+	<-sigC
+}