pause if no clients are connected

cmd/server.go

@@ -81,29 +81,31 @@ func serveClients() {
 	level = data.LoadLevel(LevelFile)
 	frameCounter = 0
 	for { // while true
-		for _, k := range clientKeys {
-			id, client := k, clients[k]
-			if id > 0 {
-				oFrame := level.GetFrame(0+frameCounter, client.w, frameCounter)
-				enc := gob.NewEncoder(client.con)
-				err := enc.Encode(oFrame)
-				if err != nil {
-					// client disconnected
-					//log.Println("BEFORE remove: clients:", clients, " clientKeys:", clientKeys)
-					// delete client
-					delete(clients, client.id)
-					// delete client key
-					// ugly as fuck in go to remove from a slice
-					// it *should* work though
-					idInKeys := sort.SearchInts(clientKeys, client.id)
-					clientKeys = append(clientKeys[:idInKeys], clientKeys[idInKeys+1:]...)
-					//log.Println("AFTER remove: clients:", clients, " clientKeys:", clientKeys)
+		if len(clients) > 0 { // pause if no clients are connected
+			for _, k := range clientKeys {
+				id, client := k, clients[k]
+				if id > 0 {
+					oFrame := level.GetFrame(0+frameCounter, client.w, frameCounter)
+					enc := gob.NewEncoder(client.con)
+					err := enc.Encode(oFrame)
+					if err != nil {
+						// client disconnected
+						//log.Println("BEFORE remove: clients:", clients, " clientKeys:", clientKeys)
+						// delete client
+						delete(clients, client.id)
+						// delete client key
+						// ugly as fuck in go to remove from a slice
+						// it *should* work though
+						idInKeys := sort.SearchInts(clientKeys, client.id)
+						clientKeys = append(clientKeys[:idInKeys], clientKeys[idInKeys+1:]...)
+						//log.Println("AFTER remove: clients:", clients, " clientKeys:", clientKeys)
+					}
+					//log.Println("ID:", id, "Client:", client)
 				}
-				//log.Println("ID:", id, "Client:", client)
 			}
+			frameCounter++
+			time.Sleep(time.Second / time.Duration(level.FPS))
 		}
-		frameCounter++
-		time.Sleep(time.Second / time.Duration(level.FPS))
 	}
 }