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 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 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 + 1, 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:	1.23
Committed:	Sat Dec 16 17:16:52 2006 UTC (17 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.22:	+1 -1 lines
Log Message:	- remove no_shout - serialise command execution somewhat again :( - avoid exceptions
#	Content
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	The author can be reached via e-mail to <crossfire@schmorp.de>
22	*/
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	#include <sproto.h>
38	#include <sockproto.h>
39
40	#include <sys/types.h>
41	#include <sys/time.h>
42	#include <sys/socket.h>
43	#include <netinet/in.h>
44	#include <netdb.h>
45
46	#include <unistd.h>
47	#include <arpa/inet.h>
48
49	#include <loader.h>
50
51	#define MAX_QUEUE_DEPTH 500 //TODO
52	#define MAX_QUEUE_BACKLOG 5. //TODO
53
54	void
55	client::reset_state ()
56	{
57	if (!pl)
58	return;
59
60	pl->run_on = 0;
61	pl->fire_on = 0;
62	}
63
64	void
65	client::queue_command (packet_type handler, char data, int datalen)
66	{
67	tstamp stamp = now ();
68
69	if (cmd_queue.size () >= MAX_QUEUE_DEPTH)
70	{
71	//TODO: just disconnect here?
72	reset_state ();
73	send_packet_printf ("drawinfo %d command queue overflow, ignoring.", NDI_RED);
74	}
75	else if (!cmd_queue.empty () && cmd_queue.front ().stamp + MAX_QUEUE_BACKLOG < stamp)
76	{
77	reset_state ();
78	send_packet_printf ("drawinfo %d too many commands in queue, ignoring.", NDI_RED);
79	}
80	else
81	cmd_queue.push_back (command (
82	stamp, handler, (char *)salloc (datalen + 1, data), datalen
83	));
84	}
85
86	bool
87	client::handle_command ()
88	{
89	if (pl && pl->state == ST_PLAYING && pl->ob && pl->ob->speed_left < 0)
90	return false;
91
92	if (cmd_queue.empty ())
93	return false;
94
95	command &cmd = cmd_queue.front ();
96
97	if (cmd.stamp + MAX_QUEUE_BACKLOG < now ())
98	{
99	reset_state ();
100	send_packet_printf ("drawinfo %d ignoring delayed command.", NDI_RED);
101	}
102	else
103	execute (cmd.handler, cmd.data, cmd.datalen);
104
105	sfree (cmd.data, cmd.datalen);
106	cmd_queue.pop_front ();
107
108	return true;
109	}
110
111	void
112	flush_sockets (void)
113	{
114	for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
115	if ((*i)->status != Ns_Dead)
116	(*i)->flush ();
117	}
118
119	/**
120	* This checks the sockets for input, does the right thing.
121	*
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	void
127	doeric_server (void)
128	{
129	#ifdef CS_LOGSTATS
130	if ((time (NULL) - cst_lst.time_start) >= CS_LOGTIME)
131	write_cs_stats ();
132	#endif
133
134	/* Go through the players. Let the loop set the next pl value,
135	* since we may remove some
136	*/
137	//TODO: must be handled cleanly elsewhere
138	for (player *pl = first_player; pl; )
139	{
140	player *npl = pl->next;
141
142	//TODO: must be handled cleanly elsewhere
143	if (!pl->socket \|\| pl->socket->status == Ns_Dead)
144	{
145	save_player (pl->ob, 0);
146
147	if (!QUERY_FLAG (pl->ob, FLAG_REMOVED))
148	{
149	terminate_all_pets (pl->ob);
150	pl->ob->remove ();
151	}
152
153	leave (pl, 1);
154	final_free_player (pl);
155	}
156
157	pl = npl;
158	}
159
160	for (sockvec::iterator i = clients.begin (); i != clients.end (); )
161	{
162	client s = i;
163
164	if (s->status == Ns_Dead)
165	{
166	clients.erase (i);
167	delete s;
168	}
169	else
170	++i;
171	}
172
173	/* We need to do some of the processing below regardless */
174
175	/* Check for any input on the sockets */
176	for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
177	{
178	client s = i;
179	player *pl = s->pl;
180
181	s->handle_packet ();
182	s->handle_command ();
183
184	//TODO: should not be done here, either
185	if (s->status != Ns_Dead && pl)
186	{
187	/* Update the players stats once per tick. More efficient than
188	* sending them whenever they change, and probably just as useful
189	*/
190	esrv_update_stats (pl);
191
192	if (pl->last_weight != -1 && pl->last_weight != WEIGHT (pl->ob))
193	{
194	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	}
199
200	draw_client_map (pl->ob);
201
202	if (s->update_look)
203	esrv_draw_look (pl->ob);
204	}
205	}
206	}
207