source/code/NetworkThing.hpp
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/*
NetworkThing.hpp
Copyright (C) 2007 Poul Sander
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Poul Sander
R�veh�jvej 36, V. 1111
2800 Kgs. Lyngby
DENMARK
blockattack@poulsander.com
*/
#if NETWORK
//The network interface
class NetworkThing
{
private:
ENetAddress address;
ENetHost * server;
ENetHost * client;
ENetPeer *peer;
BlockGame *bgHome, *bgAway; //Pointers to the two games, so we can call the procedures
bool weAreAServer, weAreAClient;
bool weAreConnected;
bool enemyIsReady;
bool enemyHasStarted; //If we should have a ready button
bool gameHasStarted; //If the player is GameOver it might just be because the game hasn't started yet... not if this is true!
public:
Uint32 theSeed;
NetworkThing()
{
weAreAServer = false;
weAreAClient = false;
weAreConnected = false;
enemyIsReady = false;
enemyHasStarted = false;
gameHasStarted = false;
if (enet_initialize () != 0)
{
fprintf (stderr, "An error occurred while initializing ENet.\n");
}
else
{
cout << "Network is working!" << endl;
}
//atexit (enet_deinitialize); in deconstructor
}
//This function couses us to remove the connection to the other peer, plus destroying servers
void ntDisconnect()
{
strcpy(bgAway->name,player2name);
if (weAreConnected || weAreAClient || weAreAServer)
{
if (weAreAClient)
{
enet_peer_disconnect (peer,0);
SDL_Delay(20);
enet_host_destroy(client);
weAreAClient = false;
weAreConnected = false;
enemyHasStarted = false;
}
if (weAreAServer)
{
enet_host_destroy(server);
weAreAServer = false;
weAreConnected = false;
enemyHasStarted = false;
}
//If the game is running then we disconnect, we are considered the looser!
if ((!bgHome->bGameOver)&&(!bgAway->bGameOver))
{
bgAway->setPlayerWon();
bgHome->SetGameOver();
}
gameHasStarted = false;
}
};
//Lets disconnect before we close...
~NetworkThing()
{
cout << "Network system is going down" << endl;
ntDisconnect();
enet_deinitialize();
cout << "Network system went down" << endl;
}
void theGameHasStarted()
{
gameHasStarted = true;
}
//The NetworkThing needs to be able to call the models... here the pointers are set
void setBGpointers(BlockGame *bg1, BlockGame *bg2)
{
bgHome = bg1;
bgAway = bg2;
}
//Starts a server instance
void startServer()
{
if (!weAreAServer)
{
ntDisconnect();
/* Bind the server to the default localhost. */
/* A specific host address can be specified by */
/* enet_address_set_host (& address, "x.x.x.x"); */
address.host = ENET_HOST_ANY;
/* Bind the server to port SERVERPORT. */
address.port = SERVERPORT;
server = enet_host_create (& address /* the address to bind the server host to */,
1 /* allow up to 1 clients and/or outgoing connections */,
0 /* assume any amount of incoming bandwidth */,
0 /* assume any amount of outgoing bandwidth */);
if (server == NULL)
{
fprintf (stderr,
"An error occurred while trying to create an ENet server host.\n");
}
else
{
weAreAServer = true;
enemyIsReady = false;
gameHasStarted = false;
cout << "Server is listening on port " << SERVERPORT << endl;
}
}
}
void connectToServer(string server)
{
ENetAddress address;
ENetEvent event;
enet_address_set_host (& address, server.c_str());
address.port = SERVERPORT;
ntDisconnect();
client = enet_host_create (NULL /* create a client host */,
1 /* only allow 1 outgoing connection */,
0 /* Unlimited downstream bandwidth */,
0 /* Unlimted upstream bandwidth */);
if (client == NULL)
{
cout << "An error occurred while trying to create an ENet client host." << endl;
}
else
{
/* Initiate the connection, allocating the four channels 0 and 1 and 2 and 3. */
peer = enet_host_connect (client, & address, 4);
if (peer == NULL)
{
cout << "No available peers for initiating an ENet connection." << endl;
}
else
if (enet_host_service (client, & event, 2000) > 0 &&
event.type == ENET_EVENT_TYPE_CONNECT)
{
cout << "We are connected!" << endl;
enemyIsReady = false;
weAreAClient = true;
weAreConnected = true;
gameHasStarted = false;
}
else
{
cout << "Server didn't answer in time" << endl;
}
}
}
bool isConnected()
{
return (weAreConnected||weAreAServer);
}
bool isConnectedToPeer()
{
return weAreConnected;
}
//This function must be called in the game loop:
void updateNetwork()
{
//Now we must send our own board:
if (weAreConnected)
{
//cout << "Creating package" << endl;
boardPackage boardpack = bgHome->getPackage();
ENetPacket * packet = enet_packet_create (&boardpack,
sizeof(boardPackage),
0);
//Now lets send the package
if (weAreAServer)
enet_host_broadcast (server, 0, packet);
else
if (weAreAClient)
enet_peer_send (peer, 0, packet);
//cout << "Package sent" << endl;
//See if we are game over and in that case notify the other player
if ((gameHasStarted)&&(bgHome->bGameOver))
{
ENetPacket * packet = enet_packet_create("G",2,ENET_PACKET_FLAG_RELIABLE);
if (weAreAServer)
enet_host_broadcast (server, 1, packet);
else
if (weAreAClient)
enet_peer_send (peer, 1, packet);
gameHasStarted=false;
}
//Now lets see if we have something to throw at the opponent.
Uint8 x,y,type;
if (gameHasStarted)
while (bgAway->popGarbage(&x,&y,&type))
{ //if there are garbage to drop
if (type==1)
{
x=255;
y=255;
}
Uint16 g = ((Uint16)x)*256+(Uint16)y; //A 16-bit int containing everything
ENetPacket * packet = enet_packet_create(&g,2,ENET_PACKET_FLAG_RELIABLE);
if (weAreAServer)
enet_host_broadcast (server, 2, packet);
else
if (weAreAClient)
enet_peer_send (peer, 2, packet);
cout << "We send a garbage block: " << (int)x << "," << (int)y << "==" << g << endl;
}
}
ENetEvent event;
/* Wait up to 0 milliseconds for an event. */
while (((weAreAClient)&&(enet_host_service (client, & event, 0) > 0))||((weAreAServer)&&(enet_host_service (server, & event, 0) > 0)))
{
switch (event.type)
{
case ENET_EVENT_TYPE_CONNECT:
printf ("A new client connected from %x:%u.\n",
event.peer -> address.host,
event.peer -> address.port);
weAreConnected = true;
/* Store any relevant client information here. */
//event.peer -> data = "Client";
{
ENetPacket * namePacket = enet_packet_create(bgHome->name,sizeof(char[30]),ENET_PACKET_FLAG_RELIABLE);
//if(weAreAServer)
enet_host_broadcast (server, 3, namePacket);
ENetPacket * answerPacket = enet_packet_create("version2",sizeof("version2"),ENET_PACKET_FLAG_RELIABLE);
enet_host_broadcast (server, 3, answerPacket);
theSeed = time(0)/4;
bgHome->putStartBlocks(theSeed);
ENetPacket * timePacket = enet_packet_create(&theSeed,sizeof(theSeed),ENET_PACKET_FLAG_RELIABLE);
enet_host_broadcast (server, 3, timePacket);
cout << "We send the seed: " << theSeed << endl;
}
break;
case ENET_EVENT_TYPE_RECEIVE:
/*printf ("A packet of length %u containing %s was received from %s on channel %u.\n",
event.packet -> dataLength,
event.packet -> data,
event.peer -> data,
event.channelID);*/
//cout << "Package recieved" << endl;
if (event.channelID==0) //Unreliable (only boardPacks)
{
boardPackage bpack;
//cout << "Package size: "<< event.packet->dataLength << " should be: " << sizeof(boardPackage) << endl;
memcpy(&bpack,(const char*)event.packet->data,sizeof(boardPackage));
bgAway->setBoard(bpack);
}
if (event.channelID==1) //reliable (used for GameOver notifications only!)
{
if ((bgHome->bGameOver)&&(!bgHome->hasWonTheGame)&&(gameHasStarted))
{
bgHome->setDraw();
bgAway->setDraw();
}
else
{
bgHome->setPlayerWon();
bgAway->SetGameOver();
}
gameHasStarted=false;
}
if (event.channelID==2) //reliable (used for Garbage only!)
{
Uint16 g;
memcpy(&g,event.packet->data,sizeof(Uint16));
Uint8 x = (g/256);
Uint8 y = (g%256);
cout << "Recieved Garbage: " << (int)x << "," << (int)y << endl;
if ((x==255)&&(y==255))
bgHome->CreateGreyGarbage();
else
bgHome->CreateGarbage(x,y);
}
if (event.channelID==3) //We have reacieved a name or a version number
{
if (event.packet->dataLength==sizeof(char[30])) //We have reveived a name
{
strcpy(bgAway->name,(const char*)event.packet->data);
cout << "The enemy name is: " << bgAway->name << " Length: " << sizeof(char[30])<< endl;
if (weAreAClient) //We have just recieved the servers name and must send our own
{
ENetPacket * answerPacket = enet_packet_create(bgHome->name,sizeof(char[30]),ENET_PACKET_FLAG_RELIABLE);
enet_peer_send (peer, 3, answerPacket);
}
}
else
if (event.packet->dataLength==sizeof("2")) //We have recieved aversion number
{
if (0!=strcmp((const char*)event.packet->data,"version2"))
{
cout << "Incompatible version: " << event.packet->data << "!=" << "version2" << endl;
ntDisconnect();
}
if (weAreAClient) //We will send our version number
{
ENetPacket * answerPacket = enet_packet_create("version2",sizeof("version2"),ENET_PACKET_FLAG_RELIABLE);
enet_peer_send (peer, 3, answerPacket);
}
}
else
if (event.packet->dataLength==sizeof(Uint32)) //We have recieved a seed
{
memcpy(&theSeed,event.packet->data,sizeof(Uint32));
bgHome->putStartBlocks(theSeed);
cout << "We recieved a seed: " << theSeed << endl;
}
}
/* Clean up the packet now that we're done using it. */
enet_packet_destroy (event.packet);
break;
case ENET_EVENT_TYPE_DISCONNECT:
//printf ("%s disconected.\n", event.peer -> data);
cout << event.peer -> data << " disconnected." << endl;
/* Reset the peer's client information. */
event.peer -> data = NULL;
//weAreConnected = false;
if ((!bgHome->bGameOver)&&(!bgAway->bGameOver))
{
bgHome->setPlayerWon();
bgAway->SetGameOver();
}
ntDisconnect(); //When we will disconnect!
}
}
}
}; //NetworkThing
#endif