added JSON API on /api

app.go

@@ -1,28 +1,70 @@
 package main
 
 import (
+	"encoding/json"
 	"fmt"
-	"github.com/gorilla/mux"
+	"github.com/gorilla/websocket"
 	"log"
 	"net"
 	"net/http"
+	"net/url"
 	"os"
+	"time"
 )
 
-func main() {
+var upgrader = websocket.Upgrader{
+	ReadBufferSize:  1024,
+	WriteBufferSize: 1024,
+}
 
-	r := mux.NewRouter()
+func main() {
-	r.HandleFunc("/", whoamI)
+	http.HandleFunc("/echo", echoHandler)
-	http.Handle("/", r)
+	http.HandleFunc("/", whoamI)
+	http.HandleFunc("/api", api)
 	fmt.Println("Starting up on 80")
 	log.Fatal(http.ListenAndServe(":80", nil))
 }
 
+func print_binary(s []byte) {
+	fmt.Printf("Received b:")
+	for n := 0; n < len(s); n++ {
+		fmt.Printf("%d,", s[n])
+	}
+	fmt.Printf("\n")
+}
+
+func echoHandler(w http.ResponseWriter, r *http.Request) {
+	conn, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	for {
+		messageType, p, err := conn.ReadMessage()
+		if err != nil {
+			return
+		}
+		print_binary(p)
+		err = conn.WriteMessage(messageType, p)
+		if err != nil {
+			return
+		}
+	}
+}
+
 func whoamI(w http.ResponseWriter, req *http.Request) {
+	u, _ := url.Parse(req.URL.String())
+	queryParams := u.Query()
+	wait := queryParams.Get("wait")
+	if len(wait) > 0 {
+		duration, err := time.ParseDuration(wait)
+		if err == nil {
+			time.Sleep(duration)
+		}
+	}
 	hostname, _ := os.Hostname()
 	fmt.Fprintln(w, "Hostname:", hostname)
 	ifaces, _ := net.Interfaces()
-	// handle err
 	for _, i := range ifaces {
 		addrs, _ := i.Addrs()
 		// handle err
@@ -39,3 +81,31 @@ func whoamI(w http.ResponseWriter, req *http.Request) {
 	}
 	req.Write(w)
 }
+
+func api(w http.ResponseWriter, req *http.Request) {
+	hostname, _ := os.Hostname()
+	data := struct {
+		Hostname string   `json:"hostname,omitempty"`
+		IP       []string `json:"ip,omitempty"`
+	}{
+		hostname,
+		[]string{},
+	}
+
+	ifaces, _ := net.Interfaces()
+	for _, i := range ifaces {
+		addrs, _ := i.Addrs()
+		// handle err
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			}
+			data.IP = append(data.IP, ip.String())
+		}
+	}
+	json.NewEncoder(w).Encode(data)
+}