raylib-src/examples/network/network_udp_server.c

/*******************************************************************************************
 *
 *   raylib [network] example - UDP Server
 *
 *   Welcome to raylib!
 *
 *   To test examples, just press F6 and execute raylib_compile_execute script
 *   Note that compiled executable is placed in the same folder as .c file
 *
 *   You can find all basic examples on C:\raylib\raylib\examples folder or
 *   raylib official webpage: www.raylib.com
 *
 *   Enjoy using raylib. :)
 *
 *   This example has been created using raylib 2.0 (www.raylib.com)
 *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h
 *for details)
 *
 *   Copyright (c) 2013-2016 Ramon Santamaria (@raysan5)
 *
 ********************************************************************************************/

#include "raylib.h"
#include "rnet.h"

#include <assert.h>
#include <stdio.h>
#include <string.h>

float         elapsed    = 0.0f;
float         delay      = 1.0f;
bool          ping       = false;
bool          pong       = false;
const char *  pingmsg    = "Ping!";
const char *  pongmsg    = "Pong!";
int           msglen     = 0;
SocketConfig  server_cfg = {.host = "127.0.0.1", .port = "4950", .server = true, .type = SOCKET_UDP, .nonblocking = true};
SocketResult *server_res = NULL;
SocketSet *   socket_set = NULL;
char          recvBuffer[512];

// Once connected to the network, check the sockets for pending information
// and when information is ready, send either a Ping or a Pong.
void NetworkUpdate()
{
	// CheckSockets
	//
	// If any of the sockets in the socket_set are pending (received data, or requests)
	// then mark the socket as being ready. You can check this with IsSocketReady(client_res->socket)
	int active = CheckSockets(socket_set, 0);
	if (active != 0) {
		TraceLog(LOG_DEBUG,
				 "There are currently %d socket(s) with data to be processed.", active);
	}

	// IsSocketReady
	//
	// If the socket is ready, attempt to receive data from the socket
	//  int bytesRecv = 0;
	//  if (IsSocketReady(server_res->socket)) {
	//      bytesRecv = SocketReceive(server_res->socket, recvBuffer, msglen);
	//  }
	int bytesRecv = SocketReceive(server_res->socket, recvBuffer, msglen);

	// If we received data, was that data a "Ping!" or a "Pong!"
	if (bytesRecv > 0) {
		if (strcmp(recvBuffer, pingmsg) == 0) { pong = true; }
		if (strcmp(recvBuffer, pongmsg) == 0) { ping = true; }
	}

	// After each delay has expired, send a response "Ping!" for a "Pong!" and vice versa
	elapsed += GetFrameTime();
	if (elapsed > delay) {
		if (ping) {
			ping = false;
			SocketSend(server_res->socket, pingmsg, msglen);
		} else if (pong) {
			pong = false;
			SocketSend(server_res->socket, pongmsg, msglen);
		}
		elapsed = 0.0f;
	}
}

int main()
{
	// Setup
	int screenWidth  = 800;
	int screenHeight = 450;
	InitWindow(
		screenWidth, screenHeight, "raylib [network] example - udp server");
	SetTargetFPS(60);
	SetTraceLogLevel(LOG_DEBUG);

	// Networking
	InitNetwork();

	//  Create the server
	//
	//  Performs
	//      getaddrinfo
	//      socket
	//      setsockopt
	//      bind
	//      listen
	server_res = AllocSocketResult();
	if (!SocketCreate(&server_cfg, server_res)) {
		TraceLog(LOG_WARNING, "Failed to open server: status %d, errno %d",
				 server_res->status, server_res->socket->status);
	} else {
		if (!SocketBind(&server_cfg, server_res)) {
			TraceLog(LOG_WARNING, "Failed to bind server: status %d, errno %d",
					 server_res->status, server_res->socket->status);
		}
	}

	//  Create & Add sockets to the socket set
	socket_set = AllocSocketSet(1);
	msglen     = strlen(pingmsg) + 1;
	memset(recvBuffer, '\0', sizeof(recvBuffer));
	AddSocket(socket_set, server_res->socket);

	// Main game loop
	while (!WindowShouldClose()) {
		BeginDrawing();
		ClearBackground(RAYWHITE);
		NetworkUpdate();
		EndDrawing();
	}

	// Cleanup
	CloseWindow();
	return 0;
}