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Comparing deliantra/server/socket/loop.C (file contents):
Revision 1.22 by root, Sat Dec 16 12:23:52 2006 UTC vs.
Revision 1.70 by root, Thu Nov 8 19:43:30 2007 UTC

1/* 1/*
2 CrossFire, A Multiplayer game for X-windows 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
4 Copyright (C) 2002-2003 Mark Wedel & The Crossfire Development Team 5 * Copyright (©) 2002-2003,2007 Mark Wedel & The Crossfire Development Team
5 Copyright (C) 1992 Frank Tore Johansen 6 * Copyright (©) 1992,2007 Frank Tore Johansen
6 7 *
7 This program is free software; you can redistribute it and/or modify 8 * Deliantra 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 * 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 * the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version. 11 * (at your option) any later version.
11 12 *
12 This program is distributed in the hope that it will be useful, 13 * This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details. 16 * GNU General Public License for more details.
16 17 *
17 You should have received a copy of the GNU General Public License 18 * 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 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 *
20 21 * The authors can be reached via e-mail to <support@deliantra.net>
21 The author can be reached via e-mail to <crossfire@schmorp.de>
22*/ 22 */
23 23
24/** 24/**
25 * \file 25 * \file
26 * Main client/server loops. 26 * Main client/server loops.
27 * 27 *
28 * \date 2003-12-02 28 * \date 2003-12-02
29 * 29 *
30 * loop.c mainly deals with initialization and higher level socket 30 * loop.c mainly deals with initialization and higher level socket
31 * maintenance (checking for lost connections and if data has arrived.) 31 * maintanance (checking for lost connections and if data has arrived.)
32 * The reading of data is handled in ericserver.c
33 */ 32 */
34
35 33
36#include <global.h> 34#include <global.h>
37#include <sproto.h> 35#include <sproto.h>
38#include <sockproto.h> 36#include <sockproto.h>
39 37
… …
46#include <unistd.h> 44#include <unistd.h>
47#include <arpa/inet.h> 45#include <arpa/inet.h>
48 46
49#include <loader.h> 47#include <loader.h>
50 48
49#define BG_SCRUB_RATE 4 // how often to send a face in the background
50
51#define MAX_QUEUE_DEPTH 500 //TODO 51#define MAX_QUEUE_DEPTH 50
52#define MAX_QUEUE_BACKLOG 2 //TODO 52#define MAX_QUEUE_BACKLOG 3.
53
54// disconnect a socket after this many seconds without an ack
55#define SOCKET_TIMEOUT 8.
53 56
54void 57void
55client::reset_state () 58client::reset_state ()
56{ 59{
57 if (!pl) 60 if (!pl)
… …
62} 65}
63 66
64void 67void
65client::queue_command (packet_type *handler, char *data, int datalen) 68client::queue_command (packet_type *handler, char *data, int datalen)
66{ 69{
67 tstamp stamp = now (); 70 tstamp stamp = NOW;
68 71
69 if (cmd_queue.size () >= MAX_QUEUE_DEPTH) 72 if (cmd_queue.size () >= MAX_QUEUE_DEPTH)
70 { 73 {
71 //TODO: just disconnect here? 74 //TODO: just disconnect here?
72 reset_state (); 75 reset_state ();
73 send_packet_printf ("drawinfo %d command queue overflow, ignoring.", NDI_RED); 76 send_packet_printf ("drawinfo %d command queue overflow, ignoring.", NDI_RED);
74 } 77 }
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 78 else
79 {
81 cmd_queue.push_back (command ( 80 cmd_queue.push_back (command ());
82 stamp, handler, (char *)salloc (datalen + 1, data), datalen 81 command &cmd = cmd_queue.back ();
83 )); 82 cmd.stamp = stamp;
83 cmd.handler = handler;
84 cmd.data = salloc<char> (datalen + 1, data);
85 cmd.datalen = datalen;
86 }
84} 87}
85 88
86bool 89bool
87client::handle_command () 90client::handle_command ()
88{ 91{
89 if (pl && pl->state == ST_PLAYING && pl->ob && pl->ob->speed_left < 0)
90 return false;
91
92 if (cmd_queue.empty ()) 92 if (!cmd_queue.empty ()
93 return false; 93 && state == ST_PLAYING
94 94 && pl->ob->speed_left > 0.f)
95 {
95 command &cmd = cmd_queue.front (); 96 command &cmd = cmd_queue.front ();
96 97
97 if (cmd.stamp + MAX_QUEUE_BACKLOG < now ()) 98 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
111void
112flush_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 */
126void
127doeric_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 { 99 {
145 save_player (pl->ob, 0); 100 reset_state ();
146 101 send_packet_printf ("drawinfo %d ignoring delayed commands.", NDI_RED);
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 } 102 }
169 else 103 else
170 ++i; 104 execute (cmd.handler, cmd.data, cmd.datalen);
105
106 cmd_queue.pop_front ();
107 return true;
108 }
109 else
110 return false;
111}
112
113void
114client::tick ()
115{
116 if (!pl || destroyed ())
117 return;
118
119 /* Update the players stats once per tick. More efficient than
120 * sending them whenever they change, and probably just as useful
121 */
122 esrv_update_stats (pl);
123
124 if (last_weight != -1 && last_weight != WEIGHT (pl->ob))
171 } 125 {
126 esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob);
127 if (last_weight != WEIGHT (pl->ob))
128 LOG (llevError, "esrv_update_item(UPD_WEIGHT) did not set player weight: is %lu, should be %lu\n",
129 (unsigned long) last_weight, WEIGHT (pl->ob));
130 }
172 131
173 /* We need to do some of the processing below regardless */ 132 draw_client_map (pl);
174 133
175 /* Check for any input on the sockets */ 134 if (update_look)
135 esrv_draw_look (pl);
136
137 mapinfo_queue_run ();
138
139#if HAVE_TCP_INFO
140 // check time of last ack, and, if too old, kill connection
141 socklen_t len = sizeof (tcpi);
142
143 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
144 {
145 if (tcpi.tcpi_snd_mss)
146 mss = tcpi.tcpi_snd_mss;
147
148#if 0
149 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",
150 tcpi.tcpi_unacked,
151 tcpi.tcpi_sacked,
152 tcpi.tcpi_lost,
153 tcpi.tcpi_retrans,
154 tcpi.tcpi_fackets,
155 tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu, tcpi.tcpi_advmss,
156
157 tcpi.tcpi_snd_cwnd - (tcpi.tcpi_unacked - tcpi.tcpi_sacked));
158#endif
159
160 // fast-time-out a player by checking for missign acks
161 // do this only when player is active
162 if (pl && pl->active
163 && tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
164 {
165 send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
166 write_outputbuffer ();
167
168 LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
169 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
170 destroy ();
171 }
172 }
173#endif
174
175 rate_avail = min (max_rate + mss, rate_avail + max_rate);
176
177 int max_send = rate_avail;
178
179#if HAVE_TCP_INFO
180 // further restrict the available bandwidth by the excess bandwidth available
181 max_send = min (max_send, (tcpi.tcpi_snd_cwnd - tcpi.tcpi_unacked + tcpi.tcpi_sacked) * mss);
182#endif
183
184 // if we can split images, round to next-lowest mss
185 if (fxix) max_send -= max_send % mss;
186
187 if (ixface.empty ())
188 {
189 // regularly send a new face when queue is empty
190 if (bg_scrub && !--bg_scrub && enable_bg_scrub)
191 while (scrub_idx < faces.size () - 1)
192 {
193 ++scrub_idx;
194
195 if (!faces_sent [scrub_idx])
196 if (faceinfo *f = face_info (scrub_idx))
197 if (f->type == FT_FACE || f->type == FT_SOUND) // only scrub faces and sounds for now
198 {
199 send_face (scrub_idx, -120);
200 flush_fx ();
201
202 bg_scrub = 1; // send up to one fx per tick, unless an image was requested
203 break;
204 }
205 }
206 }
207 else
208 {
209 bg_scrub = BG_SCRUB_RATE;
210
211 for (;;)
212 {
213 int avail = max_send - outputbuffer_len ();
214
215 if (avail <= 0)
216 break;
217
218 ixsend &ix = ixface.back ();
219
220 if (facedata *d = face_data (ix.idx, faceset))
221 {
222 if (fxix)
223 {
224 // estimate the packet header overhead "ix " + idx + (new)ofs
225 int pktlen = 3 + ber32::encoded_size (ix.idx) + ber32::encoded_size (ix.ofs);
226 int chunk = min (avail - packet::hdrlen, MAXSOCKBUF) - pktlen;
227
228 // only transfer something if the amount of data transferred
229 // has a healthy relation to the header overhead
230 if (chunk < 64)
231 break;
232
233 chunk = min (chunk, (int)ix.ofs);
234
235 ix.ofs -= chunk;
236
237 //fprintf (stderr, "i%dx %6d: %5d+%4d (%4d)\n", fxix, ix.idx,ix.ofs,chunk, ixface.size());//D
238
239 packet sl ("ix");
240
241 sl << ber32 (ix.idx)
242 << ber32 (ix.ofs)
243 << data (d->data.data () + ix.ofs, chunk);
244
245 send_packet (sl);
246 }
247 else
248 {
249 send_image (ix.idx);
250 ix.ofs = 0;
251 }
252 }
253 else
254 ix.ofs = 0;
255
256 if (!ix.ofs)
257 {
258 ixface.pop_back ();
259
260 if (ixface.empty ())
261 break;
262 }
263 }
264 }
265
266 rate_avail -= outputbuffer_len ();
267}
268
269void
270client::flush_sockets (void)
271{
176 for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i) 272 for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
177 { 273 (*i)->flush ();
178 client *s = *i; 274}
179 player *pl = s->pl;
180 275
181 s->handle_packet (); 276void
182 s->handle_command (); 277client::clock (void)
278{
279 for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i)
280 (*i)->tick ();
183 281
282 // give them all the same chances
283 flush_sockets ();
284
184 //TODO: should not be done here, either 285 //TODO: should not be done here, either
185 if (s->status != Ns_Dead && pl) 286 for (unsigned i = 0; i < clients.size (); ++i)
186 { 287 clients[i]->refcnt_chk ();
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} 288}
207 289

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