# network_command.cpp

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    00001 /* $Id: network_command.cpp 18809 2010-01-15 16:41:15Z rubidium $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * OpenTTD 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, version 2.
    00006  * OpenTTD 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.
    00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
    00008  */
    00009
    00012 #ifdef ENABLE_NETWORK
    00013
    00014 #include "../stdafx.h"
    00015 #include "../debug.h"
    00016 #include "network_client.h"
    00017 #include "network.h"
    00018 #include "../command_func.h"
    00019 #include "../company_func.h"
    00020
    00022 static CommandCallback * const _callback_table[] = {
    00023   /* 0x00 */ NULL,
    00024   /* 0x01 */ CcBuildPrimaryVehicle,
    00025   /* 0x02 */ CcBuildAirport,
    00026   /* 0x03 */ CcBuildBridge,
    00027   /* 0x04 */ CcBuildCanal,
    00028   /* 0x05 */ CcBuildDocks,
    00029   /* 0x06 */ CcFoundTown,
    00030   /* 0x07 */ CcBuildRoadTunnel,
    00031   /* 0x08 */ CcBuildRailTunnel,
    00032   /* 0x09 */ CcBuildWagon,
    00033   /* 0x0A */ CcRoadDepot,
    00034   /* 0x0B */ CcRailDepot,
    00035   /* 0x0C */ CcPlaceSign,
    00036   /* 0x0D */ CcPlaySound10,
    00037   /* 0x0E */ CcPlaySound1D,
    00038   /* 0x0F */ CcPlaySound1E,
    00039   /* 0x10 */ CcStation,
    00040   /* 0x11 */ CcTerraform,
    00041   /* 0x12 */ CcAI,
    00042   /* 0x13 */ CcCloneVehicle,
    00043   /* 0x14 */ CcGiveMoney,
    00044   /* 0x15 */ CcCreateGroup,
    00045   /* 0x16 */ CcFoundRandomTown,
    00046 };
    00047
    00049 static CommandPacket *_local_command_queue = NULL;
    00050
    00057 void NetworkAddCommandQueue(CommandPacket cp, NetworkClientSocket *cs)
    00058 {
    00059   CommandPacket *new_cp = MallocT<CommandPacket>(1);
    00060   *new_cp = cp;
    00061
    00062   CommandPacket **begin = (cs == NULL ? &_local_command_queue : &cs->command_queue);
    00063
    00064   if (*begin == NULL) {
    00065     *begin = new_cp;
    00066   } else {
    00067     CommandPacket *c = *begin;
    00068     while (c->next != NULL) c = c->next;
    00069     c->next = new_cp;
    00070   }
    00071 }
    00072
    00083 void NetworkSend_Command(TileIndex tile, uint32 p1, uint32 p2, uint32 cmd, CommandCallback *callback, const char *text, CompanyID company)
    00084 {
    00085   assert((cmd & CMD_FLAGS_MASK) == 0);
    00086
    00087   CommandPacket c;
    00088   c.company  = company;
    00089   c.next     = NULL;
    00090   c.tile     = tile;
    00091   c.p1       = p1;
    00092   c.p2       = p2;
    00093   c.cmd      = cmd;
    00094   c.callback = callback;
    00095
    00096   strecpy(c.text, (text != NULL) ? text : "", lastof(c.text));
    00097
    00098   if (_network_server) {
    00099     /* If we are the server, we queue the command in our 'special' queue.
    00100      *   In theory, we could execute the command right away, but then the
    00101      *   client on the server can do everything 1 tick faster than others.
    00102      *   So to keep the game fair, we delay the command with 1 tick
    00103      *   which gives about the same speed as most clients.
    00104      */
    00105     c.frame = _frame_counter_max + 1;
    00106     c.my_cmd = true;
    00107
    00108     NetworkAddCommandQueue(c);
    00109
    00110     /* Only the local client (in this case, the server) gets the callback */
    00111     c.callback = 0;
    00112     /* And we queue it for delivery to the clients */
    00113     NetworkClientSocket *cs;
    00114     FOR_ALL_CLIENT_SOCKETS(cs) {
    00115       if (cs->status > STATUS_MAP_WAIT) NetworkAddCommandQueue(c, cs);
    00116     }
    00117     return;
    00118   }
    00119
    00120   c.frame = 0; // The client can't tell which frame, so just make it 0
    00121
    00122   /* Clients send their command to the server and forget all about the packet */
    00123   SEND_COMMAND(PACKET_CLIENT_COMMAND)(&c);
    00124 }
    00125
    00129 void NetworkExecuteLocalCommandQueue()
    00130 {
    00131   while (_local_command_queue != NULL) {
    00132
    00133     /* The queue is always in order, which means
    00134      * that the first element will be executed first. */
    00135     if (_frame_counter < _local_command_queue->frame) break;
    00136
    00137     if (_frame_counter > _local_command_queue->frame) {
    00138       /* If we reach here, it means for whatever reason, we've already executed
    00139        * past the command we need to execute. */
    00140       error("[net] Trying to execute a packet in the past!");
    00141     }
    00142
    00143     CommandPacket *cp = _local_command_queue;
    00144
    00145     /* We can execute this command */
    00146     _current_company = cp->company;
    00147     cp->cmd |= CMD_NETWORK_COMMAND;
    00148     DoCommandP(cp, cp->my_cmd);
    00149
    00150     _local_command_queue = _local_command_queue->next;
    00151     free(cp);
    00152   }
    00153 }
    00154
    00158 void NetworkFreeLocalCommandQueue()
    00159 {
    00160   /* Free all queued commands */
    00161   while (_local_command_queue != NULL) {
    00162     CommandPacket *p = _local_command_queue;
    00163     _local_command_queue = _local_command_queue->next;
    00164     free(p);
    00165   }
    00166 }
    00167
    00174 const char *NetworkClientSocket::Recv_Command(Packet *p, CommandPacket *cp)
    00175 {
    00176   cp->company = (CompanyID)p->Recv_uint8();
    00177   cp->cmd     = p->Recv_uint32();
    00178   cp->p1      = p->Recv_uint32();
    00179   cp->p2      = p->Recv_uint32();
    00180   cp->tile    = p->Recv_uint32();
    00181   p->Recv_string(cp->text, lengthof(cp->text));
    00182
    00183   byte callback = p->Recv_uint8();
    00184
    00185   if (!IsValidCommand(cp->cmd))               return "invalid command";
    00186   if (GetCommandFlags(cp->cmd) & CMD_OFFLINE) return "offline only command";
    00187   if ((cp->cmd & CMD_FLAGS_MASK) != 0)        return "invalid command flag";
    00188   if (callback > lengthof(_callback_table))   return "invalid callback";
    00189
    00190   cp->callback = _callback_table[callback];
    00191   return NULL;
    00192 }
    00193
    00199 void NetworkClientSocket::Send_Command(Packet *p, const CommandPacket *cp)
    00200 {
    00201   p->Send_uint8 (cp->company);
    00202   p->Send_uint32(cp->cmd);
    00203   p->Send_uint32(cp->p1);
    00204   p->Send_uint32(cp->p2);
    00205   p->Send_uint32(cp->tile);
    00206   p->Send_string(cp->text);
    00207
    00208   byte callback = 0;
    00209   while (callback < lengthof(_callback_table) && _callback_table[callback] != cp->callback) {
    00210     callback++;
    00211   }
    00212
    00213   if (callback == lengthof(_callback_table)) {
    00214     DEBUG(net, 0, "Unknown callback. (Pointer: %p) No callback sent", cp->callback);
    00215     callback = 0; // _callback_table[0] == NULL
    00216   }
    00217   p->Send_uint8 (callback);
    00218 }
    00219
    00220 #endif /* ENABLE_NETWORK */