feat: added a simple hello world service for testing

bin/vproxy/flags.go

@@ -136,6 +136,23 @@ func parseFlags() {
 					},
 				},
 			},
+			{
+				Name:   "hello",
+				Usage:  "Start a simple Hello World http service",
+				Action: startHello,
+				Flags: []cli.Flag{
+					&cli.StringFlag{
+						Name:  "host",
+						Value: "127.0.0.1",
+						Usage: "Host or IP to bind on",
+					},
+					&cli.IntFlag{
+						Name:  "port",
+						Value: 8888,
+						Usage: "Port to listen on",
+					},
+				},
+			},
 			{
 				Name:   "version",
 				Usage:  "print the version",

bin/vproxy/main.go

@@ -192,6 +192,10 @@ func uninstallCAROOT() error {
 	return nil
 }
 
+func startHello(c *cli.Context) error {
+	return vproxy.StartHello(c.String("host"), c.Int("port"))
+}
+
 func main() {
 	parseFlags()
 }

hello.go

@@ -0,0 +1,20 @@
+package vproxy
+
+import (
+	"fmt"
+	"net/http"
+)
+
+// StartHello world service on the given host/port
+//
+// This is a simple service which always responds with 'Hello World'.
+// It's mainly here to serve as a simple demo of vproxy's abilities (see readme).
+func StartHello(host string, port int) error {
+	fmt.Printf("~> starting vproxy hello service at http://%s:%d\n", host, port)
+	return http.ListenAndServe(fmt.Sprintf("%s:%d", host, port), http.HandlerFunc(helloHandler))
+}
+
+func helloHandler(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(200)
+	fmt.Fprintf(w, "<h1>Hello World!</h1>")
+}