Validate flags for tls mode

server/main.go

@@ -1,9 +1,8 @@
 package main
 
 import (
-	"errors"
 	"flag"
-	"log"
+	"fmt"
 )
 
 type Server struct {
@@ -12,12 +11,24 @@ type Server struct {
 	cert *string
 }
 
-func (server *Server) Start() error {
-	return errors.New("server start to be implemented")
+func (server *Server) Start() {
+
+	if *server.tls && (len(*server.key) <= 0 || len(*server.cert) <= 0) {
+		fmt.Println("Must provide key and certificate file paths for TLS mode.")
+		return
+	}
+
+	if *server.tls {
+		fmt.Println("TLS mode activated...")
+	} else {
+		fmt.Println("Normal TCP mode...")
+	}
+
+	// Listen to connection
 }
 
 func main() {
-	tls := flag.Bool("tls", false, "Start the server in TLS mode.")
+	tls := flag.Bool("tls", false, "Start the server in TLS mode. Default is false")
 	key := flag.String("key", "", "The private key file path.")
 	cert := flag.String("cert", "", "The signed certificate file path.")
 
@@ -29,9 +40,5 @@ func main() {
 		cert: cert,
 	}
 
-	err := server.Start()
-
-	if err != nil {
-		log.Fatal(err)
-	}
+	server.Start()
 }