/[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 11 - (show annotations)
Thu Dec 14 16:29:42 2006 UTC (12 years, 10 months ago) by knops.gerd
File size: 7847 byte(s)
• Change CRLF line endings back to LF only

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
47 ###############################################################################
48 # Factory methods
49 ###############################################################################
50 sub newFromServer {
51 my $class=shift;
52
53 my $self=$class->SUPER::newFromServer(shift);
54
55 $self->{'headerBuffer'}='';
56 $self->{'MessageCount'}=0;
57 $self->{'MaxMessageCount'}=0;
58
59 $self->{'ConnectionStart'}=time;
60 my $maxTime=$::CONF{'MaxTime'};
61 if($maxTime>0)
62 {
63 $self->{'ConnectionTimeLimit'}=$self->{'ConnectionStart'}+$maxTime;
64 }
65
66 $self;
67 }
68
69 ###############################################################################
70 # Class methods
71 ###############################################################################
72 sub deleteSubscriberWithID {
73 my $class=shift;
74 my $id=shift;
75
76 if(exists($PersistentConnections{$id}))
77 {
78 $PersistentConnections{$id}->close(1);
79 }
80 }
81
82 sub pingPersistentConnections {
83 my $class=shift;
84
85 my $msg=$::CONF{'PingMessage'};
86 my @cons=values %PersistentConnections;
87
88 map { $_->write($msg) } @cons;
89 }
90
91 sub checkPersistentConnectionsForMaxTime {
92 my $class=shift;
93
94 my $time=time;
95 my @cons=values %PersistentConnections;
96
97 map { $_->checkForMaxTime($time) } @cons;
98 }
99
100 ###############################################################################
101 # Instance methods
102 ###############################################################################
103 sub processLine {
104 my $self=shift;
105 my $line=shift;
106
107 # Once the header was processed we ignore any input
108 return unless(exists($self->{'headerBuffer'}));
109
110 if($line ne '')
111 {
112 #
113 # Accumulate header
114 #
115 $self->{'headerBuffer'}.="$line\n";
116 }
117 else
118 {
119 #
120 # Empty line signals end of header.
121 # Analyze header, register with appropiate channel
122 # and send pending messages.
123 #
124 # GET $::CONF{'SubscriberDynamicPageAddress'}?channel=ml123&restartfrom=1 HTTP/1.1
125 #
126 # Find the 'GET' line
127 #
128 if($self->{'headerBuffer'}=~/GET\s+$::CONF{'SubscriberDynamicPageAddress'}\?(\S+)/)
129 {
130 my @formData=split('&',$1);
131 my $channelName=undef;
132 my $startIndex=undef;
133 my $backtrack=undef;
134 my $persist=1;
135 my $subscriberID=undef;
136 foreach my $formElement (@formData)
137 {
138 if($formElement=~/^channel=(.+)$/)
139 {
140 $channelName=$1;
141 }
142 elsif($formElement=~/^restartfrom=(\d*)$/)
143 {
144 $startIndex=$1;
145 $startIndex='' unless(defined($startIndex));
146 }
147 elsif($formElement=~/^backtrack=(\d+)$/)
148 {
149 $backtrack=$1;
150 $backtrack=0 unless(defined($backtrack));
151 }
152 elsif($formElement=~/^persist=(?i)(yes|true|1|no|false|0)$/)
153 {
154 $persist=0 if($1=~/(no|false|0)/i);
155 }
156 elsif($formElement=~/^id=(.+)$/)
157 {
158 $subscriberID=$1;
159 }
160 elsif($formElement=~/^maxmessages=(\d+)$/i)
161 {
162 $self->{'MaxMessageCount'}=$1;
163 }
164 elsif($formElement=~/^template=(\d+)$/i)
165 {
166 $self->{'HeaderTemplateNumber'}=$1;
167 }
168 elsif($formElement=~/^maxtime=(\d+)$/i)
169 {
170 my $clientRequest=$1;
171 my $serverDefault=$::CONF{'MaxTime'};
172
173 if($serverDefault==0 || $serverDefault>$clientRequest)
174 {
175 $self->{'ConnectionTimeLimit'}=$self->{'ConnectionStart'}+$clientRequest;
176 }
177 }
178 }
179
180 delete($self->{'headerBuffer'});
181
182 if(defined($startIndex) && defined($backtrack))
183 {
184 $self->emitHeader("404 Cannot use both 'restartfrom' and 'backtrack'");
185 $self->close();
186
187 return;
188 }
189
190 if(defined($subscriberID) && $persist)
191 {
192 $self->{'subscriberID'}=$subscriberID;
193 $self->deleteSubscriberWithID($subscriberID);
194 $PersistentConnections{$subscriberID}=$self;
195 }
196
197 if(defined($channelName))
198 {
199 $self->emitOKHeader();
200
201 $startIndex=-$backtrack if(!defined($startIndex) && defined($backtrack));
202
203 $self->setChannelName($channelName,$startIndex,$persist);
204
205 $self->close(1) unless($persist);
206
207 return;
208 }
209 }
210 elsif($self->{'headerBuffer'}=~/GET\s+([^\s\?]+)/)
211 {
212 Meteor::Document->serveFileToClient($1,$self);
213
214 $self->close(1);
215
216 return;
217 }
218
219 #
220 # If we fall through we did not understand the request
221 #
222 $self->emitErrorHeader();
223 }
224 }
225
226 sub setChannelName {
227 my $self=shift;
228 my $channelName=shift;
229 my $startIndex=shift;
230 my $persist=shift;
231
232 my $channel=Meteor::Channel->channelWithName($channelName);
233 $self->{'channel'}=$channel if($persist);
234
235 $channel->addSubscriber($self,$startIndex,$persist);
236 }
237
238 sub emitOKHeader {
239 my $self=shift;
240
241 $self->emitHeader('200 OK');
242 }
243
244 sub emitErrorHeader {
245 my $self=shift;
246
247 $self->emitHeader('404 Not Found');
248
249 # close up shop here!
250 $self->close();
251 }
252
253 sub emitHeader {
254 my $self=shift;
255 my $status=shift;
256
257 my $header=undef;
258 if(exists($self->{'HeaderTemplateNumber'}))
259 {
260 my $hn='HeaderTemplate'.$self->{'HeaderTemplateNumber'};
261
262 $header=$::CONF{$hn};
263 }
264 $header=$::CONF{'HeaderTemplate'} unless(defined($header));
265
266 $header=~s/~([^~]+)~/
267 if(!defined($1) || $1 eq '')
268 {
269 '~';
270 }
271 elsif($1 eq 'server')
272 {
273 $::PGM;
274 }
275 elsif($1 eq 'status')
276 {
277 $status;
278 }
279 elsif($1 eq 'servertime')
280 {
281 time;
282 }
283 else
284 {
285 '';
286 }
287 /gex;
288
289 $self->write($header);
290 }
291
292 sub sendMessage {
293 my $self=shift;
294 my $msg=shift;
295
296 $self->write($msg);
297
298 my $msgCount=++$self->{'MessageCount'};
299
300 my $maxMsg=$::CONF{'MaxMessages'};
301 if(defined($maxMsg) && $maxMsg>0 && $msgCount>=$maxMsg)
302 {
303 $self->close(1);
304 }
305
306 if($self->{'MaxMessageCount'}>0 && $msgCount>=$self->{'MaxMessageCount'})
307 {
308 $self->close(1);
309 }
310 }
311
312 sub close {
313 my $self=shift;
314 my $noShutdownMsg=shift;
315
316 $self->{'channel'}->removeSubscriber($self) if($self->{'channel'});
317 delete($self->{'channel'});
318
319 if(exists($self->{'subscriberID'}))
320 {
321 delete($PersistentConnections{$self->{'subscriberID'}});
322 }
323
324 #
325 # Send shutdown message unless remote closed or
326 # connection not yet established
327 #
328 unless($noShutdownMsg || $self->{'remoteClosed'} || exists($self->{'headerBuffer'}))
329 {
330 my $msg=$::CONF{'SubscriberShutdownMsg'};
331 if(defined($msg) && $msg ne '')
332 {
333 $self->write($msg);
334 }
335 }
336
337 $self->SUPER::close();
338 }
339
340 sub checkForMaxTime {
341 my $self=shift;
342 my $time=shift;
343
344 $self->close(1) if(exists($self->{'ConnectionTimeLimit'}) && $self->{'ConnectionTimeLimit'}<$time);
345 }
346
347 1;
348 ############################################################################EOF

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