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
 * maintanance (checking for lost connections and if data has arrived.)
 */


#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 5.  //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
    {
      cmd_queue.push_back (command ());
      command &cmd = cmd_queue.back ();
      cmd.stamp   = stamp;
      cmd.handler = handler;
      cmd.data    = salloc<char> (datalen + 1, data);
      cmd.datalen = datalen;
    }
}

bool
client::handle_command ()
{
  bool skipping = false;

  while (!cmd_queue.empty ()
         && !(pl && pl->state == ST_PLAYING && pl->ob && pl->ob->speed_left < 0))
    {
      command &cmd = cmd_queue.front ();

      if (cmd.stamp + MAX_QUEUE_BACKLOG < now ())
        {
          if (!skipping)
            {
              skipping = true;
              reset_state ();
              send_packet_printf ("drawinfo %d ignoring delayed commands.", NDI_RED);
            }

          cmd_queue.pop_front ();
        }
      else
        {
          execute (cmd.handler, cmd.data, cmd.datalen);
          cmd_queue.pop_front ();
          return true;
        }
    }

  return false;
}

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;

      //TODO: this could probably be nuked completely
      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:	1.28
Committed:	Sun Dec 17 19:14:00 2006 UTC (19 years, 9 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.27:	+2 -5 lines
Log Message:	re-enable async command execution
#	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	root	1.26	* maintanance (checking for lost connections and if data has arrived.)
32	elmex	1.1	*/
33
34
35			#include <global.h>
36	root	1.10	#include <sproto.h>
37			#include <sockproto.h>
38	elmex	1.1
39	pippijn	1.8	#include <sys/types.h>
40			#include <sys/time.h>
41			#include <sys/socket.h>
42			#include <netinet/in.h>
43			#include <netdb.h>
44	elmex	1.1
45	root	1.16	#include <unistd.h>
46			#include <arpa/inet.h>
47	elmex	1.1
48			#include <loader.h>
49
50	root	1.20	#define MAX_QUEUE_DEPTH 500 //TODO
51	root	1.23	#define MAX_QUEUE_BACKLOG 5. //TODO
52	elmex	1.1
53	root	1.21	void
54			client::reset_state ()
55			{
56			if (!pl)
57			return;
58
59			pl->run_on = 0;
60			pl->fire_on = 0;
61			}
62	elmex	1.1
63	root	1.20	void
64			client::queue_command (packet_type handler, char data, int datalen)
65	root	1.6	{
66	root	1.20	tstamp stamp = now ();
67	elmex	1.1
68	root	1.20	if (cmd_queue.size () >= MAX_QUEUE_DEPTH)
69	root	1.21	{
70			//TODO: just disconnect here?
71			reset_state ();
72			send_packet_printf ("drawinfo %d command queue overflow, ignoring.", NDI_RED);
73			}
74	root	1.20	else
75	root	1.24	{
76			cmd_queue.push_back (command ());
77			command &cmd = cmd_queue.back ();
78			cmd.stamp = stamp;
79			cmd.handler = handler;
80	root	1.25	cmd.data = salloc<char> (datalen + 1, data);
81	root	1.24	cmd.datalen = datalen;
82			}
83	root	1.20	}
84	elmex	1.1
85	root	1.20	bool
86			client::handle_command ()
87	elmex	1.1	{
88	root	1.26	bool skipping = false;
89	elmex	1.1
90	root	1.26	while (!cmd_queue.empty ()
91			&& !(pl && pl->state == ST_PLAYING && pl->ob && pl->ob->speed_left < 0))
92			{
93			command &cmd = cmd_queue.front ();
94	root	1.6
95	root	1.26	if (cmd.stamp + MAX_QUEUE_BACKLOG < now ())
96			{
97			if (!skipping)
98			{
99			skipping = true;
100			reset_state ();
101			send_packet_printf ("drawinfo %d ignoring delayed commands.", NDI_RED);
102			}
103	root	1.11
104	root	1.26	cmd_queue.pop_front ();
105			}
106			else
107			{
108			execute (cmd.handler, cmd.data, cmd.datalen);
109			cmd_queue.pop_front ();
110			return true;
111			}
112	root	1.21	}
113	root	1.6
114	root	1.26	return false;
115	elmex	1.1	}
116
117	root	1.6	void
118			flush_sockets (void)
119	elmex	1.1	{
120	root	1.19	for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
121	root	1.15	if ((*i)->status != Ns_Dead)
122			(*i)->flush ();
123	elmex	1.1	}
124
125			/**
126	root	1.10	* This checks the sockets for input, does the right thing.
127	elmex	1.1	*
128			* A bit of this code is grabbed out of socket.c
129			* There are 2 lists we need to look through - init_sockets is a list
130			*
131			*/
132	root	1.6	void
133			doeric_server (void)
134	elmex	1.1	{
135			#ifdef CS_LOGSTATS
136	root	1.6	if ((time (NULL) - cst_lst.time_start) >= CS_LOGTIME)
137			write_cs_stats ();
138	elmex	1.1	#endif
139
140	root	1.6	/* Go through the players. Let the loop set the next pl value,
141			* since we may remove some
142			*/
143	root	1.14	//TODO: must be handled cleanly elsewhere
144	root	1.20	for (player *pl = first_player; pl; )
145	root	1.6	{
146	root	1.14	player *npl = pl->next;
147
148			//TODO: must be handled cleanly elsewhere
149	root	1.20	if (!pl->socket \|\| pl->socket->status == Ns_Dead)
150	root	1.6	{
151			save_player (pl->ob, 0);
152	root	1.10
153	root	1.6	if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
154			{
155			terminate_all_pets (pl->ob);
156	root	1.9	pl->ob->remove ();
157	root	1.3	}
158	root	1.10
159	root	1.6	leave (pl, 1);
160			final_free_player (pl);
161	root	1.3	}
162	elmex	1.1
163	root	1.14	pl = npl;
164	elmex	1.1	}
165
166	root	1.19	for (sockvec::iterator i = clients.begin (); i != clients.end (); )
167	root	1.6	{
168	root	1.19	client s = i;
169	elmex	1.1
170	root	1.14	if (s->status == Ns_Dead)
171	root	1.6	{
172	root	1.19	clients.erase (i);
173	root	1.14	delete s;
174	root	1.6	}
175			else
176	root	1.20	++i;
177	elmex	1.1	}
178
179	root	1.14	/* We need to do some of the processing below regardless */
180
181	root	1.10	/* Check for any input on the sockets */
182	root	1.19	for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
183	root	1.6	{
184	root	1.19	client s = i;
185	root	1.14	player *pl = s->pl;
186	elmex	1.1
187	root	1.28	//TODO: this could probably be nuked completely
188	root	1.20	s->handle_packet ();
189	root	1.28	s->handle_command ();
190	root	1.10
191	root	1.14	//TODO: should not be done here, either
192			if (s->status != Ns_Dead && pl)
193	root	1.6	{
194	root	1.10	/* Update the players stats once per tick. More efficient than
195			* sending them whenever they change, and probably just as useful
196	root	1.6	*/
197	root	1.10	esrv_update_stats (pl);
198	root	1.20
199	root	1.10	if (pl->last_weight != -1 && pl->last_weight != WEIGHT (pl->ob))
200	root	1.6	{
201	root	1.10	esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob);
202			if (pl->last_weight != WEIGHT (pl->ob))
203			LOG (llevError, "esrv_update_item(UPD_WEIGHT) did not set player weight: is %lu, should be %lu\n",
204			(unsigned long) pl->last_weight, WEIGHT (pl->ob));
205	root	1.6	}
206
207	root	1.10	draw_client_map (pl->ob);
208	root	1.20
209	root	1.14	if (s->update_look)
210	root	1.10	esrv_draw_look (pl->ob);
211	root	1.3	}
212	elmex	1.1	}
213			}
214	root	1.10