Add an example for expvpp

Author: mohanson

lib/expvpp/cmd/http/main.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"expvar"
+	"log"
+	"math/rand/v2"
+	"net/http"
+	"time"
+
+	"github.com/libraries/daze/lib/expvpp"
+)
+
+var Expv = struct {
+	Average *expvpp.Average
+	Call    *expvar.Int
+	Hits    *expvar.Int
+	Percent *expvar.Func
+}{
+	Average: expvpp.NewAverage("Average", 64),
+	Hits:    expvar.NewInt("Hits"),
+	Call:    expvar.NewInt("Call"),
+	Percent: expvpp.NewPercent("Percent", "Hits", "Call"),
+}
+
+func main() {
+	go func() {
+		for range time.NewTicker(time.Millisecond * 125).C {
+			n := rand.Uint32N(256)
+			Expv.Average.Append(float64(n))
+			Expv.Call.Add(1)
+			if n < 8 {
+				Expv.Hits.Add(1)
+			}
+		}
+	}()
+	go func() {
+		log.Println("main: listen and serve on 127.0.0.1:8080")
+		http.ListenAndServe("127.0.0.1:8080", expvpp.ServeMux())
+	}()
+	select {}
+}