added webserver to serve json file. also running indefinitely now

main.go

@@ -23,18 +23,27 @@ const (
 // flags
 var token = flag.String("token", "", "Defines the x-auth-token")
 var version = "development"
+var delay time.Duration = 60 * time.Second
 
 func main() {
-
-	log.Println("starting version", version, "...")
+	log.Printf("starting version %s...\n", version)
 	// parse all flags
 	flag.Parse()
-
 	// check if token is set
 	if *token == "" {
 		log.Fatalln("Please specify an API token via the flag '-token'")
 	}
 
+	// start API processing (runs in a loop)
+	go processAPIs()
+
+	// start webserver
+	serveJSON()
+}
+
+func processAPIs() {
+	tick := time.Tick(delay)
+	for range tick {
 		// Variables for runtime
 		var links []link
 		var nodes []node
@@ -131,11 +140,15 @@ func main() {
 
 		// create file output
 		log.Println("writing json file")
-	writeJSONtoFile(o)
+
+		if err := o.writeToFile(); err != nil {
+			log.Fatalln(err)
+		}
 
 		// we're done here
 		log.Println("...done")
 	}
+}
 
 func getDevices() (devices, error) {
 	// get devices from JSON file
@@ -213,22 +226,19 @@ func addLink(dev unifiAPIResponse, airmaxes unifiAPIAirmax, links []link) []link
 	return links
 }
 
-func writeJSONtoFile(o output) error {
-	file, err := json.MarshalIndent(o, "", "  ")
-	if err != nil {
-		return fmt.Errorf("can't marshal to json: %+v", o)
-	}
-
-	// write to file
-	err = ioutil.WriteFile("example.json", file, 0644)
-	if err != nil {
-		return fmt.Errorf("can't write to json file example.json")
-	}
-	return nil
-}
-
 func getAddresses(ip string) []string {
 	var adresses []string
 	adresses = append(adresses, strings.Split(ip, "/")[0])
 	return adresses
 }
+
+func serveJSON() {
+	fs := http.FileServer(http.Dir("./output"))
+	http.Handle("/", fs)
+
+	log.Println("Listening on :3000...")
+	err := http.ListenAndServe(":3000", nil)
+	if err != nil {
+		log.Fatalln(err)
+	}
+}