/[meteor]/googlecode.com/svn/trunk/Meteor/Subscriber.pm
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/Meteor/Subscriber.pm

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Revision 32 - (show annotations)
Thu Dec 20 21:24:24 2007 UTC (12 years, 5 months ago) by andrew.betts
File size: 8465 byte(s)
Complete rewrite of the JS web client
Opera and Safari compatibility
Saner request format

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 # Subscriber.pm
8 #
9 # Description:
10 # A Meteor Subscriber
11 #
12 ###############################################################################
13 #
14 # This program is free software; you can redistribute it and/or modify it
15 # under the terms of the GNU General Public License as published by the Free
16 # Software Foundation; either version 2 of the License, or (at your option)
17 # any later version.
18 #
19 # This program is distributed in the hope that it will be useful, but WITHOUT
20 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
21 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
22 # more details.
23 #
24 # You should have received a copy of the GNU General Public License along
25 # with this program; if not, write to the Free Software Foundation, Inc.,
26 # 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #
28 # For more information visit www.meteorserver.org
29 #
30 ###############################################################################
31
32 package Meteor::Subscriber;
33 ###############################################################################
34 # Configuration
35 ###############################################################################
36
37 use strict;
38
39 use Meteor::Connection;
40 use Meteor::Channel;
41 use Meteor::Document;
42
43 @Meteor::Subscriber::ISA=qw(Meteor::Connection);
44
45 our %PersistentConnections=();
46 our $NumAcceptedConnections=0;
47
48 ###############################################################################
49 # Factory methods
50 ###############################################################################
51 sub newFromServer {
52 my $class=shift;
53
54 my $self=$class->SUPER::newFromServer(shift);
55
56 $self->{'headerBuffer'}='';
57 $self->{'MessageCount'}=0;
58 $self->{'MaxMessageCount'}=0;
59
60 $self->{'ConnectionStart'}=time;
61 my $maxTime=$::CONF{'MaxTime'};
62 if($maxTime>0)
63 {
64 $self->{'ConnectionTimeLimit'}=$self->{'ConnectionStart'}+$maxTime;
65 }
66
67 $::Statistics->{'current_subscribers'}++;
68 $::Statistics->{'subscriber_connections_accepted'}++;
69
70 $self;
71 }
72
73 ###############################################################################
74 # Class methods
75 ###############################################################################
76 sub deleteSubscriberWithID {
77 my $class=shift;
78 my $id=shift;
79
80 if(exists($PersistentConnections{$id}))
81 {
82 $PersistentConnections{$id}->close(1);
83 }
84 }
85
86 sub pingPersistentConnections {
87 my $class=shift;
88
89 my $msg=$::CONF{'PingMessage'};
90 my @cons=values %PersistentConnections;
91
92 map { $_->write($msg) } @cons;
93 }
94
95 sub checkPersistentConnectionsForMaxTime {
96 my $class=shift;
97
98 my $time=time;
99 my @cons=values %PersistentConnections;
100
101 map { $_->checkForMaxTime($time) } @cons;
102 }
103
104 sub numSubscribers {
105
106 return scalar(keys %PersistentConnections);
107 }
108
109 ###############################################################################
110 # Instance methods
111 ###############################################################################
112 sub processLine {
113 my $self=shift;
114 my $line=shift;
115
116 # Once the header was processed we ignore any input
117 return unless(exists($self->{'headerBuffer'}));
118
119 if($line ne '')
120 {
121 #
122 # Accumulate header
123 #
124 $self->{'headerBuffer'}.="$line\n";
125 }
126 else
127 {
128 #
129 # Empty line signals end of header.
130 # Analyze header, register with appropiate channel
131 # and send pending messages.
132 #
133 # GET $::CONF{'SubscriberDynamicPageAddress'}/hostid/streamtype/channeldefs HTTP/1.1
134 #
135 # Find the 'GET' line
136 #
137 if($self->{'headerBuffer'}=~/GET\s+$::CONF{'SubscriberDynamicPageAddress'}\/([0-9a-z]+)\/([0-9a-z]+)\/(\S+)/i)
138 {
139 my $subscriberID=$1;
140 my $persist=0;
141 $self->{'mode'}=$2;
142 if ($self->{'mode'} eq "xhrinteractive" || $self->{'mode'} eq "iframe" || $self->{'mode'} eq "serversent" || $self->{'mode'} eq "longpoll") {
143 $persist=1;
144 $self->{'MaxMessageCount'}=1 unless(!($self->{'mode'} eq "longpoll"));
145 }
146 if ($self->{'mode'} eq "iframe") {
147 $self->{'HeaderTemplateNumber'}=1;
148 } else {
149 $self->{'HeaderTemplateNumber'}=2;
150 }
151 my @channelData=split('/',$3);
152 my $channels={};
153 my $channelName;
154 my $offset;
155 foreach my $chandef (@channelData)
156 {
157 if($chandef=~/^([a-z0-9]+)(.(r|b|h)([0-9]*))?$/)
158 {
159 $channelName = $1;
160 $channels->{$channelName}->{'startIndex'} = undef;
161 for ($3) {
162 $offset = $4;
163 /r/ && do { $channels->{$channelName}->{'startIndex'} = $offset; last; };
164 /b/ && do { $channels->{$channelName}->{'startIndex'} = -$offset; last; };
165 /h/ && do { $channels->{$channelName}->{'startIndex'} = 0; last; };
166 }
167 }
168 }
169
170 delete($self->{'headerBuffer'});
171
172 if($persist)
173 {
174 $self->{'subscriberID'}=$subscriberID;
175 $self->deleteSubscriberWithID($subscriberID);
176 $PersistentConnections{$subscriberID}=$self;
177 }
178
179 if(scalar(keys %{$channels}))
180 {
181 $self->emitOKHeader();
182 $self->setChannels($channels,$persist);
183 $self->close(1) unless($persist);
184 return;
185 }
186 }
187 elsif($self->{'headerBuffer'}=~/GET\s+\/disconnect\/(\S+)/)
188 {
189 $self->deleteSubscriberWithID($1);
190 $self->emitOKHeader();
191 $self->close(1);
192 return;
193 }
194 elsif($self->{'headerBuffer'}=~/GET\s+([^\s\?]+)/)
195 {
196 Meteor::Document->serveFileToClient($1,$self);
197 $self->close(1);
198 return;
199 }
200
201 #
202 # If we fall through we did not understand the request
203 #
204 $self->emitErrorHeader();
205 }
206 }
207
208 sub setChannels {
209 my $self=shift;
210 my $channels=shift;
211 my $persist=shift;
212
213 foreach my $channelName (keys %{$channels})
214 {
215 my $startIndex=$channels->{$channelName}->{'startIndex'};
216
217 my $channel=Meteor::Channel->channelWithName($channelName);
218
219 $self->{'channels'}->{$channelName}=$channel if($persist);
220
221 $channel->addSubscriber($self,$startIndex,$persist);
222 }
223 }
224
225 sub emitOKHeader {
226 my $self=shift;
227
228 $self->emitHeader('200 OK');
229 }
230
231 sub emitErrorHeader {
232 my $self=shift;
233
234 $self->emitHeader('404 Not Found');
235 $::Statistics->{'errors_served'}++;
236
237 # close up shop here!
238 $self->close();
239 }
240
241 sub emitHeader {
242 my $self=shift;
243 my $status=shift;
244
245 my $header=undef;
246 if(exists($self->{'HeaderTemplateNumber'}))
247 {
248 my $hn='HeaderTemplate'.$self->{'HeaderTemplateNumber'};
249
250 $header=$::CONF{$hn};
251 }
252 $header=$::CONF{'HeaderTemplate'} unless(defined($header));
253
254 $header=~s/~([^~]+)~/
255 if(!defined($1) || $1 eq '')
256 {
257 '~';
258 }
259 elsif($1 eq 'server')
260 {
261 $::PGM;
262 }
263 elsif($1 eq 'status')
264 {
265 $status;
266 }
267 elsif($1 eq 'servertime')
268 {
269 time;
270 }
271 else
272 {
273 '';
274 }
275 /gex;
276
277 $self->write($header);
278 }
279
280 sub sendMessage {
281 my $self=shift;
282 my $msg=shift;
283 my $numMsgInThisBatch=shift;
284
285 $numMsgInThisBatch=1 unless(defined($numMsgInThisBatch));
286
287 $self->write($msg);
288
289 $::Statistics->{'messages_served'}+=$numMsgInThisBatch;
290
291 my $msgCount=++$self->{'MessageCount'};
292
293 my $maxMsg=$::CONF{'MaxMessages'};
294 if(defined($maxMsg) && $maxMsg>0 && $msgCount>=$maxMsg)
295 {
296 $self->close(1);
297 }
298
299 if($self->{'MaxMessageCount'}>0 && $msgCount>=$self->{'MaxMessageCount'})
300 {
301 $self->close(1);
302 }
303 }
304
305 sub closeChannel {
306 my $self=shift;
307 my $channelName=shift;
308
309 return unless(exists($self->{'channels'}->{$channelName}));
310
311 my $channel=$self->{'channels'}->{$channelName};
312 $channel->removeSubscriber($self);
313
314 delete($self->{'channels'}->{$channelName});
315
316 $self->close() if(scalar(keys %{$self->{'channels'}})==0);
317 }
318
319 sub close {
320 my $self=shift;
321 my $noShutdownMsg=shift;
322
323 foreach my $channelName (keys %{$self->{'channels'}})
324 {
325 my $channel=$self->{'channels'}->{$channelName};
326 $channel->removeSubscriber($self);
327 }
328 delete($self->{'channels'});
329
330 if(exists($self->{'subscriberID'}))
331 {
332 delete($PersistentConnections{$self->{'subscriberID'}});
333 }
334
335 #
336 # Send shutdown message unless remote closed or
337 # connection not yet established
338 #
339 unless($noShutdownMsg || $self->{'remoteClosed'} || exists($self->{'headerBuffer'}))
340 {
341 my $msg=$::CONF{'SubscriberShutdownMsg'};
342 if(defined($msg) && $msg ne '')
343 {
344 $self->write($msg);
345 }
346 }
347
348 $::Statistics->{'current_subscribers'}--;
349
350 $self->SUPER::close();
351 }
352
353 sub checkForMaxTime {
354 my $self=shift;
355 my $time=shift;
356
357 $self->close(1) if(exists($self->{'ConnectionTimeLimit'}) && $self->{'ConnectionTimeLimit'}<$time);
358 }
359
360 1;
361 ############################################################################EOF

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