network_gamelist.cpp

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00001 /* $Id: network_gamelist.cpp 11691 2007-12-25 09:48:53Z rubidium $ */
00002 
00008 #ifdef ENABLE_NETWORK
00009 
00010 #include "../stdafx.h"
00011 #include "../debug.h"
00012 #include "../newgrf_config.h"
00013 #include "../core/alloc_func.hpp"
00014 #include "core/game.h"
00015 #include "network_udp.h"
00016 #include "network_gamelist.h"
00017 #include "network_gui.h"
00018 
00019 NetworkGameList *_network_game_list = NULL;
00020 
00026 NetworkGameList *NetworkGameListAddItem(uint32 ip, uint16 port)
00027 {
00028   NetworkGameList *item, *prev_item;
00029 
00030   prev_item = NULL;
00031   for (item = _network_game_list; item != NULL; item = item->next) {
00032     if (item->ip == ip && item->port == port) return item;
00033     prev_item = item;
00034   }
00035 
00036   item = MallocT<NetworkGameList>(1);
00037   memset(item, 0, sizeof(*item));
00038   item->next = NULL;
00039   item->ip = ip;
00040   item->port = port;
00041 
00042   if (prev_item == NULL) {
00043     _network_game_list = item;
00044   } else {
00045     prev_item->next = item;
00046   }
00047   DEBUG(net, 4, "[gamelist] added server to list");
00048 
00049   UpdateNetworkGameWindow(false);
00050 
00051   return item;
00052 }
00053 
00056 void NetworkGameListRemoveItem(NetworkGameList *remove)
00057 {
00058   NetworkGameList *item, *prev_item;
00059 
00060   prev_item = NULL;
00061   for (item = _network_game_list; item != NULL; item = item->next) {
00062     if (remove == item) {
00063       if (prev_item == NULL) {
00064         _network_game_list = remove->next;
00065       } else {
00066         prev_item->next = remove->next;
00067       }
00068 
00069       /* Remove GRFConfig information */
00070       ClearGRFConfigList(&remove->info.grfconfig);
00071       free(remove);
00072       remove = NULL;
00073 
00074       DEBUG(net, 4, "[gamelist] removed server from list");
00075       UpdateNetworkGameWindow(false);
00076       return;
00077     }
00078     prev_item = item;
00079   }
00080 }
00081 
00082 enum {
00083   MAX_GAME_LIST_REQUERY_COUNT  =  5, 
00084   REQUERY_EVERY_X_GAMELOOPS    = 60, 
00085   REFRESH_GAMEINFO_X_REQUERIES = 50, 
00086 };
00087 
00089 void NetworkGameListRequery()
00090 {
00091   static uint8 requery_cnt = 0;
00092 
00093   if (++requery_cnt < REQUERY_EVERY_X_GAMELOOPS) return;
00094   requery_cnt = 0;
00095 
00096   struct in_addr ip;
00097   NetworkGameList *item;
00098 
00099   for (item = _network_game_list; item != NULL; item = item->next) {
00100     item->retries++;
00101     if (item->retries < REFRESH_GAMEINFO_X_REQUERIES && (item->online || item->retries >= MAX_GAME_LIST_REQUERY_COUNT)) continue;
00102 
00103     ip.s_addr = item->ip;
00104 
00105     /* item gets mostly zeroed by NetworkUDPQueryServer */
00106     uint8 retries = item->retries;
00107     NetworkUDPQueryServer(inet_ntoa(ip), item->port);
00108     item->retries = (retries >= REFRESH_GAMEINFO_X_REQUERIES) ? 0 : retries;
00109   }
00110 }
00111 
00112 #endif /* ENABLE_NETWORK */

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