server/socket/loop.C

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 *
 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 *
 * Deliantra is free software: you can redistribute it and/or modify it under
 * the terms of the Affero GNU General Public License as published by the
 * Free Software Foundation, either version 3 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 Affero GNU General Public License
 * and the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * The authors can be reached via e-mail to <support@deliantra.net>
 */

/**
 * \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>

#define BG_SCRUB_RATE 4 // how often to send a face in the background

#define MAX_QUEUE_DEPTH   50
#define MAX_QUEUE_BACKLOG 3.

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)
    {
      reset_state ();
      send_packet_printf ("msg %d 0 command queue overflow, ignoring.", NDI_RED);
    }
  else
    {
      cmd_queue.resize (cmd_queue.size () + 1);
      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 ()
{
  if (!cmd_queue.empty ()
      && state == ST_PLAYING
      && pl->ob->speed_left > 0.f)
    {
      command &cmd = cmd_queue.front ();

      if (cmd.stamp + MAX_QUEUE_BACKLOG < NOW)
        {
          reset_state (); // the command might actually reset some movement state etc.

          if (pl)
            pl->failmsg (
               "Cannot keep up with your commands, ignoring them! "
               "H<Your character cannot keep up with the instructions you give G<him|her>. "
               "Try issuing commands slower, or, if G<he|she> is incapacitated (paralyzed and so on), "
               "wait till your character can act again.\n\nIf G<he|she> is permanently stuck, then "
               "try the B<suicide> command (or use B<chat> to ask somebody to B<invite> you out).>"
            );
        }
      else
        execute (cmd.handler, cmd.data, cmd.datalen);

      sfree<char> (cmd.data, cmd.datalen + 1);
      cmd_queue.pop_front ();
      return true;
    }
  else
    return false;
}

void
client::tick ()
{
  if (destroyed ())
    return;

  if (pl)
    {
      pl->dirty = true;

      /* Update the players stats once per tick.  More efficient than
       * sending them whenever they change, and probably just as useful
       */
      pl->need_updated_stats ();
      esrv_update_stats (pl);

      if (pl->ns->update_spells)
        esrv_update_spells (pl);

      sint32 weight = pl->ob->client_weight ();

      if (last_weight != weight)
        {
          pl->ob->update_stats ();
          esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob);
        }

      draw_client_map (pl);

      if (update_look)
        esrv_draw_look (pl);

      mapinfo_queue_run ();
    }

#if HAVE_TCP_INFO
  // check time of last ack, and, if too old, kill connection
  socklen_t len = sizeof (tcpi);

  if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
    {
      if (tcpi.tcpi_snd_mss)
        mss = tcpi.tcpi_snd_mss;

#if 0
      fprintf (stderr, "uack %d ack %d lost %d ret %d fack %d sst %d cwnd %d mss %d pmtu %d advmss %d EXC %d\n",
               tcpi.tcpi_unacked,
               tcpi.tcpi_sacked,
               tcpi.tcpi_lost,
               tcpi.tcpi_retrans,
               tcpi.tcpi_fackets,
               tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu, tcpi.tcpi_advmss,
               
               tcpi.tcpi_snd_cwnd - (tcpi.tcpi_unacked - tcpi.tcpi_sacked));
#endif

      // fast-time-out a player by checking for missing acks
      // do this only when player is active
      if (pl && pl->active
          && tcpi.tcpi_last_ack_recv > int (socket_timeout * 1000))
        {
          send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
          write_outputbuffer ();

          LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
               (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
          destroy ();
        }
    }
#endif

  // limit budget surplus/deficit by one mss, add per-tick budget
  rate_avail = min (rate_avail, mss) + max_rate;

  int max_send = rate_avail;

#if HAVE_TCP_INFO
  // further restrict the available bandwidth by the excess bandwidth available
  min_it (max_send, (tcpi.tcpi_snd_cwnd - tcpi.tcpi_unacked + tcpi.tcpi_sacked) * mss);
#endif

  // round to next-lowest mss
  max_send -= max_send % mss;

  if (ixface.empty ())
    {
      // regularly send a new face when queue is empty
      if (bg_scrub && !--bg_scrub)
        while (scrub_idx < faces.size () - 1)
          {
            ++scrub_idx;

            if (!faces_sent [scrub_idx])
              if (faceinfo *f = face_info (scrub_idx))
                if (f->type == FT_IMAGE || f->type == FT_SOUND) // only scrub faces and sounds for now
                  {
                    send_face (scrub_idx, -120);
                    flush_fx ();

                    bg_scrub = 1; // send up to one fx per tick, unless an image was requested
                    break;
                  }
          }
    }
  else
    {
      bg_scrub = BG_SCRUB_RATE;

      for (;;)
        {
          int avail = max_send - outputbuffer_len ();

          if (avail <= 0)
            break;

          ixsend &ix = ixface.back ();

          // estimate the packet header overhead "ix " + idx + (new)ofs
          int pktlen = 3 + ber32::encoded_size (ix.idx) + ber32::encoded_size (ix.ofs);
          int chunk = min (avail - packet::hdrlen, MAXSOCKBUF) - pktlen;

          // only transfer something if the amount of data transferred
          // has a healthy relation to the header overhead
          if (chunk < 64)
            break;

          chunk = min (chunk, (int)ix.ofs);

          ix.ofs -= chunk;

          //fprintf (stderr, "i%dx %6d: %5d+%4d   (%4d)\n", fxix, ix.idx,ix.ofs,chunk, ixface.size());//D

          packet sl ("ix");

          sl << ber32 (ix.idx)
             << ber32 (ix.ofs)
             << data (ix.data + ix.ofs, chunk);

          send_packet (sl);

          if (!ix.ofs)
            {
              ix_pop ();

              if (ixface.empty ())
                break;
            }
        }
    }

  rate_avail -= outputbuffer_len ();
}

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

void
client::clock ()
{
  for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
    (*i)->tick ();

  // give them all the same chances
  flush_sockets ();

  //TODO: should not be done here, either
  for (unsigned i = 0; i < clients.size (); ++i)
    clients[i]->refcnt_chk ();
}

Revision:	1.98
Committed:	Sat Nov 17 06:05:33 2012 UTC (11 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.97:	+1 -1 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	*
4	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	*
6	* Deliantra is free software: you can redistribute it and/or modify it under
7	* the terms of the Affero GNU General Public License as published by the
8	* Free Software Foundation, either version 3 of the License, or (at your
9	* option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the Affero GNU General Public License
17	* and the GNU General Public License along with this program. If not, see
18	* <http://www.gnu.org/licenses/>.
19	*
20	* The authors can be reached via e-mail to <support@deliantra.net>
21	*/
22
23	/**
24	* \file
25	* Main client/server loops.
26	*
27	* \date 2003-12-02
28	*
29	* loop.c mainly deals with initialization and higher level socket
30	* maintanance (checking for lost connections and if data has arrived.)
31	*/
32
33	#include <global.h>
34	#include <sproto.h>
35	#include <sockproto.h>
36
37	#include <sys/types.h>
38	#include <sys/time.h>
39	#include <sys/socket.h>
40	#include <netinet/in.h>
41	#include <netdb.h>
42
43	#include <unistd.h>
44	#include <arpa/inet.h>
45
46	#define BG_SCRUB_RATE 4 // how often to send a face in the background
47
48	#define MAX_QUEUE_DEPTH 50
49	#define MAX_QUEUE_BACKLOG 3.
50
51	void
52	client::reset_state ()
53	{
54	if (!pl)
55	return;
56
57	pl->run_on = 0;
58	pl->fire_on = 0;
59	}
60
61	void
62	client::queue_command (packet_type handler, char data, int datalen)
63	{
64	tstamp stamp = NOW;
65
66	if (cmd_queue.size () >= MAX_QUEUE_DEPTH)
67	{
68	reset_state ();
69	send_packet_printf ("msg %d 0 command queue overflow, ignoring.", NDI_RED);
70	}
71	else
72	{
73	cmd_queue.resize (cmd_queue.size () + 1);
74	command &cmd = cmd_queue.back ();
75	cmd.stamp = stamp;
76	cmd.handler = handler;
77	cmd.data = salloc<char> (datalen + 1, data);
78	cmd.datalen = datalen;
79	}
80	}
81
82	bool
83	client::handle_command ()
84	{
85	if (!cmd_queue.empty ()
86	&& state == ST_PLAYING
87	&& pl->ob->speed_left > 0.f)
88	{
89	command &cmd = cmd_queue.front ();
90
91	if (cmd.stamp + MAX_QUEUE_BACKLOG < NOW)
92	{
93	reset_state (); // the command might actually reset some movement state etc.
94
95	if (pl)
96	pl->failmsg (
97	"Cannot keep up with your commands, ignoring them! "
98	"H<Your character cannot keep up with the instructions you give G<him\|her>. "
99	"Try issuing commands slower, or, if G<he\|she> is incapacitated (paralyzed and so on), "
100	"wait till your character can act again.\n\nIf G<he\|she> is permanently stuck, then "
101	"try the B<suicide> command (or use B<chat> to ask somebody to B<invite> you out).>"
102	);
103	}
104	else
105	execute (cmd.handler, cmd.data, cmd.datalen);
106
107	sfree<char> (cmd.data, cmd.datalen + 1);
108	cmd_queue.pop_front ();
109	return true;
110	}
111	else
112	return false;
113	}
114
115	void
116	client::tick ()
117	{
118	if (destroyed ())
119	return;
120
121	if (pl)
122	{
123	pl->dirty = true;
124
125	/* Update the players stats once per tick. More efficient than
126	* sending them whenever they change, and probably just as useful
127	*/
128	pl->need_updated_stats ();
129	esrv_update_stats (pl);
130
131	if (pl->ns->update_spells)
132	esrv_update_spells (pl);
133
134	sint32 weight = pl->ob->client_weight ();
135
136	if (last_weight != weight)
137	{
138	pl->ob->update_stats ();
139	esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob);
140	}
141
142	draw_client_map (pl);
143
144	if (update_look)
145	esrv_draw_look (pl);
146
147	mapinfo_queue_run ();
148	}
149
150	#if HAVE_TCP_INFO
151	// check time of last ack, and, if too old, kill connection
152	socklen_t len = sizeof (tcpi);
153
154	if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
155	{
156	if (tcpi.tcpi_snd_mss)
157	mss = tcpi.tcpi_snd_mss;
158
159	#if 0
160	fprintf (stderr, "uack %d ack %d lost %d ret %d fack %d sst %d cwnd %d mss %d pmtu %d advmss %d EXC %d\n",
161	tcpi.tcpi_unacked,
162	tcpi.tcpi_sacked,
163	tcpi.tcpi_lost,
164	tcpi.tcpi_retrans,
165	tcpi.tcpi_fackets,
166	tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu, tcpi.tcpi_advmss,
167
168	tcpi.tcpi_snd_cwnd - (tcpi.tcpi_unacked - tcpi.tcpi_sacked));
169	#endif
170
171	// fast-time-out a player by checking for missing acks
172	// do this only when player is active
173	if (pl && pl->active
174	&& tcpi.tcpi_last_ack_recv > int (socket_timeout * 1000))
175	{
176	send_msg (NDI_RED \| NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
177	write_outputbuffer ();
178
179	LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
180	(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
181	destroy ();
182	}
183	}
184	#endif
185
186	// limit budget surplus/deficit by one mss, add per-tick budget
187	rate_avail = min (rate_avail, mss) + max_rate;
188
189	int max_send = rate_avail;
190
191	#if HAVE_TCP_INFO
192	// further restrict the available bandwidth by the excess bandwidth available
193	min_it (max_send, (tcpi.tcpi_snd_cwnd - tcpi.tcpi_unacked + tcpi.tcpi_sacked) * mss);
194	#endif
195
196	// round to next-lowest mss
197	max_send -= max_send % mss;
198
199	if (ixface.empty ())
200	{
201	// regularly send a new face when queue is empty
202	if (bg_scrub && !--bg_scrub)
203	while (scrub_idx < faces.size () - 1)
204	{
205	++scrub_idx;
206
207	if (!faces_sent [scrub_idx])
208	if (faceinfo *f = face_info (scrub_idx))
209	if (f->type == FT_IMAGE \|\| f->type == FT_SOUND) // only scrub faces and sounds for now
210	{
211	send_face (scrub_idx, -120);
212	flush_fx ();
213
214	bg_scrub = 1; // send up to one fx per tick, unless an image was requested
215	break;
216	}
217	}
218	}
219	else
220	{
221	bg_scrub = BG_SCRUB_RATE;
222
223	for (;;)
224	{
225	int avail = max_send - outputbuffer_len ();
226
227	if (avail <= 0)
228	break;
229
230	ixsend &ix = ixface.back ();
231
232	// estimate the packet header overhead "ix " + idx + (new)ofs
233	int pktlen = 3 + ber32::encoded_size (ix.idx) + ber32::encoded_size (ix.ofs);
234	int chunk = min (avail - packet::hdrlen, MAXSOCKBUF) - pktlen;
235
236	// only transfer something if the amount of data transferred
237	// has a healthy relation to the header overhead
238	if (chunk < 64)
239	break;
240
241	chunk = min (chunk, (int)ix.ofs);
242
243	ix.ofs -= chunk;
244
245	//fprintf (stderr, "i%dx %6d: %5d+%4d (%4d)\n", fxix, ix.idx,ix.ofs,chunk, ixface.size());//D
246
247	packet sl ("ix");
248
249	sl << ber32 (ix.idx)
250	<< ber32 (ix.ofs)
251	<< data (ix.data + ix.ofs, chunk);
252
253	send_packet (sl);
254
255	if (!ix.ofs)
256	{
257	ix_pop ();
258
259	if (ixface.empty ())
260	break;
261	}
262	}
263	}
264
265	rate_avail -= outputbuffer_len ();
266	}
267
268	void
269	client::flush_sockets ()
270	{
271	for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
272	(*i)->flush ();
273	}
274
275	void
276	client::clock ()
277	{
278	for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
279	(*i)->tick ();
280
281	// give them all the same chances
282	flush_sockets ();
283
284	//TODO: should not be done here, either
285	for (unsigned i = 0; i < clients.size (); ++i)
286	clients[i]->refcnt_chk ();
287	}
288