/[meteor]/googlecode.com/svn/trunk/meteord
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /googlecode.com/svn/trunk/meteord

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Revision 62 - (show annotations)
Thu Nov 27 00:33:21 2008 UTC (10 years, 7 months ago) by andrew.betts
File size: 9135 byte(s)
1 Fixed: Added SIGPIPE handler.  We noticed that under heavy load
Meteor receives SIGPIPEs from the OS, suspected to relate to clients
that have just disconnected the moment Meteor attempts to write to the
socket.  This caused Meteor to crash.
2 Fixed: Long polling multiple channels no longer causes the loop to
die and restart when some channels have messages queued for delivery.
3 Fixed: Over time, Meteor 'collected' connections from clients that
never got disconnected even if MaxTime was set.  This happened if the
client concerned sent a header with no terminating blank line.  Meteor
kept waiting for the rest of the header, which never arrived, and
therefore the client remained in limbo, never subjected to the MaxTime
time limit because it had not yet become a subscriber.  Clients are
now allowed 30 seconds to send a valid request header.
4 Fixed: If only one message existed on the server, the JS client
would continue to request it again and again, because it has message
ID 0, and the JS client considered this an invalid message ID.
5 Fixed: Corrected some comments in file headers

6 Changed: MaxMessages has been renamed to CloseOnEvent and functions
in a similar, but not quite identical way.  Thanks to Matthew Haak,
who pointed out the extreme confusingness of MaxMessages and a bug
that has resulted in Fix 2 above.  Setting CloseOnEvent to any value
that evaluates to true will cause Meteor to close subscriber
connections after at least one message has been sent and there are no
further messages pending.  This is identical to MaxMessages for values
of 0 and 1, but where MaxMessages is set to a value higher than one,
replacing it with CloseOnEvent with the same value will act as though
it were set to one.  The intent of MaxMessages was to enable long-
polling (and it is used by the JS client in that way), and
CloseonEvent is a drop in replacement for that behaviour.
7 Changed: Meteor JS client now uses dynamic <SCRIPT> tags for all
polling behaviours, rather than XHR.  This enables it to make poll
requests cross-domain (see 13)
8 Changed: Meteor JS client now abstracts timestamp lookups to a
dedicated method.
9 Changed: Default HeaderTemplates no longer include cache busting
headers, since all meteor requests contain a millisecond timestamp and
so no client makes the same request twice.  These were therefore
simply chewing up bandwidth.
10 Changed: Date strings used for logging debug messages are cached to
avoid numerous expensive lookups to localtime().
11 Changed: Channel info is only sent in a response if the client does
not request a restart from a specified ID.  The logic being that if
the client knows the ID they want to start from, they have already
made previous requests and have the channel information they need.
Bandwidth saving measure.

12 Added: JS client now has a Meteor.isSupportedBrowser() method,
which you can call to detemine whether Meteor will run in the user's
browser version.
13 Added: JS client can now use different hosts for polling and
streaming.  This is only really useful if your website is on a domain
that has a lot of cookies, and you don't want to send them in every
poll request.  Removing cookies from request headers can reduce the
size of the request significantly.  We find that with cookies included
Meteor poll requests are usually larger than the responses.  To use,
set Meteor.pollhost.  Meteor.pollhost can be any domain, while
Meteor.host must be a subdomain of your website hostname.
14 Added: Config file now supports new 'FooterTemplate' parameter, for
a string to send just before the connection to the subscriber is
closed.  This is in support of change 7.
15 Added: Better inline documentation for ChannelInfoTemplate config
parameter
16 Added: Log output includes connection IDs corresponding to the file
inode for each connection
17 Added: New controller command LISTCONNECTIONS, produces a newline
delimited list of all currently connected clients, and for each one
displaying "ConnectionID IPAddress ClientType [SubscriberID]"
18 Added: New controller command DESCRIBE, takes a ConnectionID as a
parameter, and outputs numerous statistics about that particular
client, including number of messages sent/received, user agent, IP
address, time connected, time remaining until MaxTime etc.
19 Added: New controller comment LISTSUBSCRIBERS, produces a newline
delimited list of all currently connected streaming subscribers, and
for each one displaying "SubscriberID IPAddress Starttime TimeLimit
TimeRemaining MessageCount UserAgent"
20 Added: SHOWSTATS command produces the following additional stats:
connection_count: total current connections, real_subscribers: total
of number of currently connected streaming subscribers plus the number
of unique polling connections seen in the last 60 seconds.
21 Added: STDERR outputs prior to every exit() for debugging purposes
22 Added: The UDP server is now considered stable, and is the best way
of broadcasting messages to lots of Meteor nodes simultaneously and
efficiently. 


1 #!/usr/bin/perl -w
2 ###############################################################################
3 # Meteor
4 # An HTTP server for the 2.0 web
5 # Copyright (c) 2006 contributing authors
6 #
7 # The Meteor daemon
8 #
9 # Main program should call Meteor::Config::setCommandLineParameters(@ARGV),.
10 # Afterwards anybody can access $::CONF{<parameterName>}, where
11 # <parameterName> is any valid parameter (except 'Help') listed in the
12 # @DEFAULTS array below.
13 #
14 ###############################################################################
15 #
16 # This program is free software; you can redistribute it and/or modify it
17 # under the terms of the GNU General Public License as published by the Free
18 # Software Foundation; either version 2 of the License, or (at your option)
19 # any later version.
20 #
21 # This program is distributed in the hope that it will be useful, but WITHOUT
22 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
23 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
24 # more details.
25 #
26 # You should have received a copy of the GNU General Public License along
27 # with this program; if not, write to the Free Software Foundation, Inc.,
28 # 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 #
30 # For more information visit www.meteorserver.org
31 #
32 ###############################################################################
33
34 ###############################################################################
35 # meterod version
36 ################################################################################
37
38 $::VERSION='1.06.02';
39 $::RELEASE_DATE='not yet released';
40
41 ###############################################################################
42 # Configuration
43 ###############################################################################
44
45 use strict;
46
47 use Socket;
48
49 use Meteor::Syslog;
50
51 use Meteor::Socket;
52 use Meteor::Connection;
53 use Meteor::Controller;
54 use Meteor::Subscriber;
55 use Meteor::Channel;
56 use Meteor::Document;
57 use Meteor::Config;
58
59 $::CRLF="\r\n"; # Line separator to be used throughout all modules
60
61 our $CONTROL_QUEUE_SIZE=5;
62 our $SUBSCRIBER_QUEUE_SIZE=20;
63
64 our $MAIN_LOOP_TIMEOUT=60;
65 our $AGE_CHECK_INTERVALL=60;
66
67 our $MAX_EXIT_DELAY=120;
68
69 our $UDP_MAX_MESSAGE_SIZE=8192;
70
71 ###############################################################################
72 # Main
73 ###############################################################################
74
75 #
76 # Record startup time
77 #
78 $::STARTUP_TIME=time;
79 $::STARTUP_TIME+=0; # avoid warning
80
81 #
82 # Program name
83 #
84 $::PGM=$0;
85 $::PGM=~s/^.*\///;
86
87 #
88 # Handle command line options and config file
89 #
90 Meteor::Config->setCommandLineParameters(@ARGV);
91
92 #
93 # Do something about warn and die
94 #
95 unless($::CONF{'Debug'})
96 {
97 $SIG{'__WARN__'}=\&Meteor::Syslog::myWarn;
98 $SIG{'__DIE__'}=\&Meteor::Syslog::myDie;
99 }
100
101 &::syslog('info',"$::PGM launched!");
102
103 #
104 # Daemonize
105 #
106 {
107 $0="$::PGM daemon";
108
109 my $facility=$::CONF{'SyslogFacility'} || $Meteor::Syslog::DEFAULT_FACILITY;
110
111 unless($::CONF{'Debug'} || $facility eq 'none')
112 {
113 # close standard file descriptors
114 close(STDIN);
115 close(STDOUT);
116 close(STDERR);
117 chdir("/");
118 umask(0);
119
120 # fork and exit parent
121 print STDERR "Exit: Fork\n";
122 exit if fork;
123 setpgrp(0, $$) if defined $SIG{TTOU};
124 $SIG{TTOU}='ignore' if defined $SIG{TTOU};
125
126 # Avoid 'stdin reopened for output' warning with newer perls
127 open(NULL,'/dev/null');
128 <NULL> if(0);
129 open(OUT,">/var/run/$::PGM.pid");
130 print OUT "$$\n";
131 close(OUT);
132
133 }
134 else
135 {
136 &::syslog('info',"PID\t%s",$$);
137 }
138 }
139
140 #
141 # Signal handlers
142 #
143 $::HUP=$::TERM=$::USR1=$::USR2=0;
144 $SIG{'HUP'}=sub{$::HUP=1};
145 $SIG{'TERM'}=sub{$::TERM=1};
146 $SIG{'USR1'}=sub{$::USR1=1};
147 $SIG{'USR2'}=sub{$::USR2=1};
148 $SIG{'PIPE'}=sub{&::syslog('info',"Signal PIPE received and ignored\n");};
149
150 #
151 # Run server
152 #
153 my $con_counter=0;
154 my $con;
155
156 my $controlServer=Meteor::Socket->newServer(
157 $::CONF{'ControllerPort'},
158 $CONTROL_QUEUE_SIZE,
159 $::CONF{'ControllerIP'}
160 );
161 my $controlServerFN=$controlServer->fileno();
162
163 my $subscriberServer=Meteor::Socket->newServer(
164 $::CONF{'SubscriberPort'},
165 $SUBSCRIBER_QUEUE_SIZE,
166 $::CONF{'SubscriberIP'}
167 );
168 my $subscriberServerFN=$subscriberServer->fileno();
169
170 my $udpServer=undef;
171 my $udpPort=$::CONF{'UDPPort'};
172 my $udpServerFN=undef;
173 if($udpPort && $udpPort>0)
174 {
175 $udpServer=Meteor::Socket->newUDPServer(
176 $udpPort,
177 $::CONF{'UDPIP'}
178 );
179 $udpServerFN=$udpServer->fileno();
180 }
181
182 my $serverVector='';
183 vec($serverVector,$controlServerFN,1)=1;
184 vec($serverVector,$subscriberServerFN,1)=1;
185 vec($serverVector,$udpServerFN,1)=1 if(defined($udpServerFN));
186
187 my $lastAgeCheck=time;
188
189 my $nextPing=undef;
190 if(exists($::CONF{'PingInterval'}) && $::CONF{'PingInterval'}>2)
191 {
192 $nextPing=$::CONF{'PingInterval'}+$lastAgeCheck;
193 }
194
195 while(!$::TERM)
196 {
197 eval
198 {
199 while(!$::TERM)
200 {
201
202
203 my $rVec=$serverVector;
204 my $wVec='';
205 my $eVec='';
206
207 my $rout;
208 my $wout;
209 my $eout;
210
211 Meteor::Connection->addAllHandleBits(\$rVec,\$wVec,\$eVec);
212
213 my $timeout=$MAIN_LOOP_TIMEOUT;
214 if(defined($nextPing))
215 {
216 $timeout=$nextPing-time;
217 }
218
219 my $result=0;
220 if($timeout>0)
221 {
222 $result=&Meteor::Socket::sselect($rout=$rVec,$wout=$wVec,$eout=$eVec,$timeout);
223 }
224
225 if($result>0)
226 {
227 if(vec($rout,$controlServerFN,1))
228 {
229 Meteor::Controller->newFromServer($controlServer);
230 }
231 if(vec($rout,$subscriberServerFN,1))
232 {
233 Meteor::Subscriber->newFromServer($subscriberServer);
234 }
235 if(defined($udpServerFN) && vec($rout,$udpServerFN,1))
236 {
237 &handleUPD($udpServer);
238 }
239
240 Meteor::Connection->checkAllHandleBits($rout,$wout,$eout);
241 }
242 elsif($result<0)
243 {
244 &::syslog('crit',"Select failed: $!");
245 sleep(30);
246 }
247
248 if($::HUP)
249 {
250 $::HUP=0;
251
252 &::syslog('info',"Received SIGHUP, re-reading config and clearing document cache!");
253
254 Meteor::Config->readConfig();
255 Meteor::Config->updateConfig();
256
257 Meteor::Document->clearDocuments()
258 }
259
260 if($::USR1)
261 {
262 $::USR1=0;
263
264 &::syslog('info',"Received SIGUSR1, clearing channel buffers!");
265
266 Meteor::Channel->clearAllBuffers();
267 }
268
269 if($::USR2)
270 {
271 $::USR2=0;
272
273 &::syslog('info',"Received SIGUSR2, clearing document cache!");
274
275 Meteor::Document->clearDocuments()
276 }
277
278 my $t=time;
279 if($t>$lastAgeCheck+$AGE_CHECK_INTERVALL)
280 {
281 my $minTimeStap=time-$::CONF{'MaxMessageAge'};
282 Meteor::Channel->trimMessageStoresByTimestamp($minTimeStap);
283 $lastAgeCheck=time;
284 $t=$lastAgeCheck;
285
286 Meteor::Subscriber->checkPersistentConnectionsForMaxTime();
287 Meteor::Connection->destroyBadRequests();
288 }
289
290 if(defined($nextPing) && $nextPing<=$t)
291 {
292 $nextPing=undef;
293
294 Meteor::Subscriber->pingPersistentConnections();
295
296 if(exists($::CONF{'MaxMessageAge'}) && $::CONF{'MaxMessageAge'}>2)
297 {
298 $nextPing=$::CONF{'PingInterval'}+time;
299 }
300 }
301 }
302 };
303 unless($::TERM)
304 {
305 &::syslog('alert',"$::PGM loop died (will restart in 2 seconds): $@");
306 sleep(2);
307 }
308 }
309
310 #
311 # Proper shutdown
312 #
313 if($::TERM)
314 {
315 &::syslog('info',"Received SIGTERM, begin shutdown!");
316
317 $subscriberServer->close();
318 $controlServer->close();
319
320 unlink("/var/run/$::PGM.pid") unless($::CONF{'Debug'});
321
322 Meteor::Connection->closeAllConnections();
323
324 my $timoutAt=time+$MAX_EXIT_DELAY;
325
326 while(Meteor::Connection->connectionCount() && time<$timoutAt)
327 {
328 my $rVec='';
329 my $wVec='';
330 my $eVec='';
331
332 my $rout;
333 my $wout;
334 my $eout;
335
336 Meteor::Connection->addAllHandleBits(\$rVec,\$wVec,\$eVec);
337
338 my $result=&Meteor::Socket::sselect($rout=$rVec,$wout=$wVec,$eout=$eVec,$timoutAt-time);
339
340 if($result>0)
341 {
342 Meteor::Connection->checkAllHandleBits($rout,$wout,$eout);
343 }
344 }
345
346 if(my $cnt=Meteor::Connection->connectionCount())
347 {
348 &::syslog('info',"$cnt client(s) unresponsive, will shutdown anyway");
349
350 print STDERR "Exit: TERM Shutdown (unresponsive clients)\n";
351 exit(1);
352 }
353
354 &::syslog('info',"shutdown succeeded");
355
356 print STDERR "Exit: TERM Shutdown (clean)\n";
357 exit(0);
358 }
359
360 &::syslog('emerg',"$::PGM loop exited");
361
362 ###############################################################################
363 # Subroutines
364 ###############################################################################
365 sub handleUPD {
366 $udpServer=shift;
367
368 my $line;
369 my $hispaddr=recv($udpServer->{'handle'},$line,$::UDP_MAX_MESSAGE_SIZE,0);
370
371 &::syslog('debug',"udp message received: %s",$line);
372
373 return unless($line=~s/^(\S+)\s//);
374
375 my $cmd=$1;
376
377 if($cmd eq 'ADDMESSAGE')
378 {
379 return unless($line=~s/^(\S+)\s//);
380
381 my $channelName=$1;
382 my $channel=Meteor::Channel->channelWithName($channelName);
383 my $msg=$channel->addMessage($line);
384 my $msgID=$msg->id();
385 &::syslog('debug',"udp: new message added, ID %s",$msgID);
386 }
387 }
388
389 1;
390 ############################################################################EOF

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