Fix passing port on command line

docker-compose.yml

@@ -3,4 +3,5 @@ services:
   rove-server:
     build: .
     ports:
-      - "80:8080"
+      - "80:80"
+    command: ./rove-server --port 80

main.go

@@ -13,6 +13,8 @@ import (
 var port = flag.Int("port", 8080, "The port to host on")
 
 func main() {
+	flag.Parse()
+
 	s := server.NewServer(
 		server.OptionPort(*port),
 		server.OptionPersistentData())

pkg/server/server.go

@@ -65,7 +65,6 @@ func NewServer(opts ...ServerOption) *Server {
 		world:       game.NewWorld(),
 		persistence: EphemeralData,
 		router:      router,
-		server:      &http.Server{Addr: ":8080", Handler: router},
 	}
 
 	// Apply all options
@@ -73,6 +72,9 @@ func NewServer(opts ...ServerOption) *Server {
 		o(s)
 	}
 
+	// Set up the server object
+	s.server = &http.Server{Addr: fmt.Sprintf(":%d", s.port), Handler: router}
+
 	return s
 }
 
@@ -104,7 +106,7 @@ func (s *Server) Run() {
 	defer s.sync.Done()
 
 	// Listen and serve the http requests
-	fmt.Println("Serving HTTP")
+	fmt.Printf("Serving HTTP on port %d\n", s.port)
 	if err := s.server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
 		log.Fatal(err)
 	}