server/socket/loop.C

/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2002-2003 Mark Wedel & The Crossfire Development Team
    Copyright (C) 1992 Frank Tore Johansen

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

    The author can be reached via e-mail to <crossfire@schmorp.de>
*/

/**
 * \file
 * Main client/server loops.
 *
 * \date 2003-12-02
 *
 * loop.c mainly deals with initialization and higher level socket
 * maintenance (checking for lost connections and if data has arrived.)
 * The reading of data is handled in ericserver.c
 */


#include <global.h>
#include <sproto.h>
#include <sockproto.h>

#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

#include <unistd.h>
#include <arpa/inet.h>

#include <loader.h>

#define MAX_QUEUE_DEPTH   500 //TODO
#define MAX_QUEUE_BACKLOG 2   //TODO

void
client::reset_state ()
{
  if (!pl)
    return;

  pl->run_on  = 0;
  pl->fire_on = 0;
}

void
client::queue_command (packet_type *handler, char *data, int datalen)
{
  tstamp stamp = now ();

  if (cmd_queue.size () >= MAX_QUEUE_DEPTH)
    {
      //TODO: just disconnect here?
      reset_state ();
      send_packet_printf ("drawinfo %d command queue overflow, ignoring.", NDI_RED);
    }
  else if (!cmd_queue.empty () && cmd_queue.front ().stamp + MAX_QUEUE_BACKLOG < stamp)
    {
      reset_state ();
      send_packet_printf ("drawinfo %d too many commands in queue, ignoring.", NDI_RED);
    }
  else
    cmd_queue.push_back (command (
       stamp, handler, (char *)salloc (datalen, data), datalen
    ));
}

bool
client::handle_command ()
{
  if (pl && pl->state == ST_PLAYING && pl->ob && pl->ob->speed_left < 0)
    return false;

  if (cmd_queue.empty ())
    return false;

  command &cmd = cmd_queue.front ();

  if (cmd.stamp + MAX_QUEUE_BACKLOG < now ())
    {
      reset_state ();
      send_packet_printf ("drawinfo %d ignoring delayed command.", NDI_RED);
    }
  else
    execute (cmd.handler, cmd.data, cmd.datalen);

  sfree (cmd.data, cmd.datalen);
  cmd_queue.pop_front ();

  return true;
}

void
flush_sockets (void)
{
  for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
    if ((*i)->status != Ns_Dead)
      (*i)->flush ();
}

/**
 * This checks the sockets for input, does the right thing.
 *
 * A bit of this code is grabbed out of socket.c
 * There are 2 lists we need to look through - init_sockets is a list
 * 
 */
void
doeric_server (void)
{
#ifdef CS_LOGSTATS
  if ((time (NULL) - cst_lst.time_start) >= CS_LOGTIME)
    write_cs_stats ();
#endif

  /* Go through the players.  Let the loop set the next pl value,
   * since we may remove some
   */
  //TODO: must be handled cleanly elsewhere
  for (player *pl = first_player; pl; )
    {
      player *npl = pl->next;

      //TODO: must be handled cleanly elsewhere
      if (!pl->socket || pl->socket->status == Ns_Dead)
        {
          save_player (pl->ob, 0);

          if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
            {
              terminate_all_pets (pl->ob);
              pl->ob->remove ();
            }

          leave (pl, 1);
          final_free_player (pl);
        }

      pl = npl;
    }

  for (sockvec::iterator i = clients.begin (); i != clients.end (); )
    {
      client *s = *i;

      if (s->status == Ns_Dead)
        {
          clients.erase (i);
          delete s;
        }
      else
        ++i;
    }

  /* We need to do some of the processing below regardless */

  /* Check for any input on the sockets */
  for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
    {
      client *s = *i;
      player *pl = s->pl;

      s->handle_packet ();
      s->handle_command ();

      //TODO: should not be done here, either
      if (s->status != Ns_Dead && pl)
        {
          /* Update the players stats once per tick.  More efficient than
           * sending them whenever they change, and probably just as useful
           */
          esrv_update_stats (pl);

          if (pl->last_weight != -1 && pl->last_weight != WEIGHT (pl->ob))
            {
              esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob);
              if (pl->last_weight != WEIGHT (pl->ob))
                LOG (llevError, "esrv_update_item(UPD_WEIGHT) did not set player weight: is %lu, should be %lu\n",
                     (unsigned long) pl->last_weight, WEIGHT (pl->ob));
            }

          draw_client_map (pl->ob);

          if (s->update_look)
            esrv_draw_look (pl->ob);
        }
    }
}

Revision:	1.21
Committed:	Sat Dec 16 03:21:08 2006 UTC (17 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.20:	+23 -8 lines
Log Message:	- limit command backlog to two seconds
#	User	Rev	Content
1	elmex	1.1	/*
2			CrossFire, A Multiplayer game for X-windows
3
4			Copyright (C) 2002-2003 Mark Wedel & The Crossfire Development Team
5			Copyright (C) 1992 Frank Tore Johansen
6
7			This program is free software; you can redistribute it and/or modify
8			it under the terms of the GNU General Public License as published by
9			the Free Software Foundation; either version 2 of the License, or
10			(at your option) any later version.
11
12			This program is distributed in the hope that it will be useful,
13			but WITHOUT ANY WARRANTY; without even the implied warranty of
14			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			GNU General Public License for more details.
16
17			You should have received a copy of the GNU General Public License
18			along with this program; if not, write to the Free Software
19			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20
21	root	1.7	The author can be reached via e-mail to <crossfire@schmorp.de>
22	elmex	1.1	*/
23
24			/**
25			* \file
26			* Main client/server loops.
27			*
28			* \date 2003-12-02
29			*
30			* loop.c mainly deals with initialization and higher level socket
31			* maintenance (checking for lost connections and if data has arrived.)
32			* The reading of data is handled in ericserver.c
33			*/
34
35
36			#include <global.h>
37	root	1.10	#include <sproto.h>
38			#include <sockproto.h>
39	elmex	1.1
40	pippijn	1.8	#include <sys/types.h>
41			#include <sys/time.h>
42			#include <sys/socket.h>
43			#include <netinet/in.h>
44			#include <netdb.h>
45	elmex	1.1
46	root	1.16	#include <unistd.h>
47			#include <arpa/inet.h>
48	elmex	1.1
49			#include <loader.h>
50
51	root	1.20	#define MAX_QUEUE_DEPTH 500 //TODO
52	root	1.21	#define MAX_QUEUE_BACKLOG 2 //TODO
53	elmex	1.1
54	root	1.21	void
55			client::reset_state ()
56			{
57			if (!pl)
58			return;
59
60			pl->run_on = 0;
61			pl->fire_on = 0;
62			}
63	elmex	1.1
64	root	1.20	void
65			client::queue_command (packet_type handler, char data, int datalen)
66	root	1.6	{
67	root	1.20	tstamp stamp = now ();
68	elmex	1.1
69	root	1.20	if (cmd_queue.size () >= MAX_QUEUE_DEPTH)
70	root	1.21	{
71			//TODO: just disconnect here?
72			reset_state ();
73			send_packet_printf ("drawinfo %d command queue overflow, ignoring.", NDI_RED);
74			}
75	root	1.20	else if (!cmd_queue.empty () && cmd_queue.front ().stamp + MAX_QUEUE_BACKLOG < stamp)
76	root	1.21	{
77			reset_state ();
78			send_packet_printf ("drawinfo %d too many commands in queue, ignoring.", NDI_RED);
79			}
80	root	1.20	else
81			cmd_queue.push_back (command (
82			stamp, handler, (char *)salloc (datalen, data), datalen
83			));
84			}
85	elmex	1.1
86	root	1.20	bool
87			client::handle_command ()
88	elmex	1.1	{
89	root	1.20	if (pl && pl->state == ST_PLAYING && pl->ob && pl->ob->speed_left < 0)
90			return false;
91	elmex	1.1
92	root	1.20	if (cmd_queue.empty ())
93			return false;
94	root	1.6
95	root	1.20	command &cmd = cmd_queue.front ();
96	root	1.11
97	root	1.20	if (cmd.stamp + MAX_QUEUE_BACKLOG < now ())
98	root	1.21	{
99			reset_state ();
100			send_packet_printf ("drawinfo %d ignoring delayed command.", NDI_RED);
101			}
102	root	1.20	else
103			execute (cmd.handler, cmd.data, cmd.datalen);
104	root	1.11
105	root	1.20	sfree (cmd.data, cmd.datalen);
106			cmd_queue.pop_front ();
107	root	1.6
108	root	1.20	return true;
109	elmex	1.1	}
110
111	root	1.6	void
112			flush_sockets (void)
113	elmex	1.1	{
114	root	1.19	for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
115	root	1.15	if ((*i)->status != Ns_Dead)
116			(*i)->flush ();
117	elmex	1.1	}
118
119			/**
120	root	1.10	* This checks the sockets for input, does the right thing.
121	elmex	1.1	*
122			* A bit of this code is grabbed out of socket.c
123			* There are 2 lists we need to look through - init_sockets is a list
124			*
125			*/
126	root	1.6	void
127			doeric_server (void)
128	elmex	1.1	{
129			#ifdef CS_LOGSTATS
130	root	1.6	if ((time (NULL) - cst_lst.time_start) >= CS_LOGTIME)
131			write_cs_stats ();
132	elmex	1.1	#endif
133
134	root	1.6	/* Go through the players. Let the loop set the next pl value,
135			* since we may remove some
136			*/
137	root	1.14	//TODO: must be handled cleanly elsewhere
138	root	1.20	for (player *pl = first_player; pl; )
139	root	1.6	{
140	root	1.14	player *npl = pl->next;
141
142			//TODO: must be handled cleanly elsewhere
143	root	1.20	if (!pl->socket \|\| pl->socket->status == Ns_Dead)
144	root	1.6	{
145			save_player (pl->ob, 0);
146	root	1.10
147	root	1.6	if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
148			{
149			terminate_all_pets (pl->ob);
150	root	1.9	pl->ob->remove ();
151	root	1.3	}
152	root	1.10
153	root	1.6	leave (pl, 1);
154			final_free_player (pl);
155	root	1.3	}
156	elmex	1.1
157	root	1.14	pl = npl;
158	elmex	1.1	}
159
160	root	1.19	for (sockvec::iterator i = clients.begin (); i != clients.end (); )
161	root	1.6	{
162	root	1.19	client s = i;
163	elmex	1.1
164	root	1.14	if (s->status == Ns_Dead)
165	root	1.6	{
166	root	1.19	clients.erase (i);
167	root	1.14	delete s;
168	root	1.6	}
169			else
170	root	1.20	++i;
171	elmex	1.1	}
172
173	root	1.14	/* We need to do some of the processing below regardless */
174
175	root	1.10	/* Check for any input on the sockets */
176	root	1.19	for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
177	root	1.6	{
178	root	1.19	client s = i;
179	root	1.14	player *pl = s->pl;
180	elmex	1.1
181	root	1.20	s->handle_packet ();
182			s->handle_command ();
183	root	1.10
184	root	1.14	//TODO: should not be done here, either
185			if (s->status != Ns_Dead && pl)
186	root	1.6	{
187	root	1.10	/* Update the players stats once per tick. More efficient than
188			* sending them whenever they change, and probably just as useful
189	root	1.6	*/
190	root	1.10	esrv_update_stats (pl);
191	root	1.20
192	root	1.10	if (pl->last_weight != -1 && pl->last_weight != WEIGHT (pl->ob))
193	root	1.6	{
194	root	1.10	esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob);
195			if (pl->last_weight != WEIGHT (pl->ob))
196			LOG (llevError, "esrv_update_item(UPD_WEIGHT) did not set player weight: is %lu, should be %lu\n",
197			(unsigned long) pl->last_weight, WEIGHT (pl->ob));
198	root	1.6	}
199
200	root	1.10	draw_client_map (pl->ob);
201	root	1.20
202	root	1.14	if (s->update_look)
203	root	1.10	esrv_draw_look (pl->ob);
204	root	1.3	}
205	elmex	1.1	}
206			}
207	root	1.10