/[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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Annotation of /googlecode.com/svn/trunk/Meteor/Subscriber.pm

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Revision 17 - (hide annotations)
Tue May 1 17:10:10 2007 UTC (13 years, 2 months ago) by knops.gerd
File size: 8913 byte(s)
• Make persist a global instead of channel-specific parameter

1 knops.gerd 11 #!/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 knops.gerd 13 my $channels={};
137 knops.gerd 11 foreach my $formElement (@formData)
138     {
139     if($formElement=~/^channel=(.+)$/)
140     {
141 knops.gerd 13 if(defined($channelName))
142     {
143     if(defined($startIndex) && defined($backtrack))
144     {
145     $self->emitHeader("404 Cannot use both 'restartfrom' and 'backtrack'");
146     $self->close();
147    
148     return;
149     }
150    
151     $startIndex=-$backtrack if(!defined($startIndex) && defined($backtrack));
152     $channels->{$channelName}->{'startIndex'}=$startIndex;
153    
154     $startIndex=undef;
155     $backtrack=undef;
156     }
157 knops.gerd 11 $channelName=$1;
158     }
159     elsif($formElement=~/^restartfrom=(\d*)$/)
160     {
161     $startIndex=$1;
162     $startIndex='' unless(defined($startIndex));
163     }
164     elsif($formElement=~/^backtrack=(\d+)$/)
165     {
166     $backtrack=$1;
167     $backtrack=0 unless(defined($backtrack));
168     }
169     elsif($formElement=~/^persist=(?i)(yes|true|1|no|false|0)$/)
170     {
171     $persist=0 if($1=~/(no|false|0)/i);
172     }
173     elsif($formElement=~/^id=(.+)$/)
174     {
175     $subscriberID=$1;
176     }
177     elsif($formElement=~/^maxmessages=(\d+)$/i)
178     {
179     $self->{'MaxMessageCount'}=$1;
180     }
181     elsif($formElement=~/^template=(\d+)$/i)
182     {
183     $self->{'HeaderTemplateNumber'}=$1;
184     }
185     elsif($formElement=~/^maxtime=(\d+)$/i)
186     {
187     my $clientRequest=$1;
188     my $serverDefault=$::CONF{'MaxTime'};
189    
190     if($serverDefault==0 || $serverDefault>$clientRequest)
191     {
192     $self->{'ConnectionTimeLimit'}=$self->{'ConnectionStart'}+$clientRequest;
193     }
194     }
195     }
196    
197 knops.gerd 13 if(defined($channelName))
198 knops.gerd 11 {
199 knops.gerd 13 if(defined($startIndex) && defined($backtrack))
200     {
201     $self->emitHeader("404 Cannot use both 'restartfrom' and 'backtrack'");
202     $self->close();
203    
204     return;
205     }
206 knops.gerd 11
207 knops.gerd 13 $startIndex=-$backtrack if(!defined($startIndex) && defined($backtrack));
208     $channels->{$channelName}->{'startIndex'}=$startIndex;
209 knops.gerd 11 }
210    
211 knops.gerd 13 delete($self->{'headerBuffer'});
212    
213 knops.gerd 17 if(defined($subscriberID) && $persist)
214 knops.gerd 11 {
215     $self->{'subscriberID'}=$subscriberID;
216     $self->deleteSubscriberWithID($subscriberID);
217     $PersistentConnections{$subscriberID}=$self;
218     }
219    
220 knops.gerd 13 if(scalar(keys %{$channels}))
221 knops.gerd 11 {
222     $self->emitOKHeader();
223    
224 knops.gerd 17 $self->setChannels($channels,$persist);
225 knops.gerd 11
226 knops.gerd 17 $self->close(1) unless($persist);
227 knops.gerd 11
228     return;
229     }
230     }
231     elsif($self->{'headerBuffer'}=~/GET\s+([^\s\?]+)/)
232     {
233     Meteor::Document->serveFileToClient($1,$self);
234    
235     $self->close(1);
236    
237     return;
238     }
239    
240     #
241     # If we fall through we did not understand the request
242     #
243     $self->emitErrorHeader();
244     }
245     }
246    
247 knops.gerd 13 sub setChannels {
248 knops.gerd 11 my $self=shift;
249 knops.gerd 13 my $channels=shift;
250 knops.gerd 17 my $persist=shift;
251 knops.gerd 11
252 knops.gerd 13 foreach my $channelName (keys %{$channels})
253     {
254     my $startIndex=$channels->{$channelName}->{'startIndex'};
255    
256     my $channel=Meteor::Channel->channelWithName($channelName);
257    
258     $self->{'channels'}->{$channelName}=$channel if($persist);
259    
260     $channel->addSubscriber($self,$startIndex,$persist);
261     }
262 knops.gerd 11 }
263    
264     sub emitOKHeader {
265     my $self=shift;
266    
267     $self->emitHeader('200 OK');
268     }
269    
270     sub emitErrorHeader {
271     my $self=shift;
272    
273     $self->emitHeader('404 Not Found');
274    
275     # close up shop here!
276     $self->close();
277     }
278    
279     sub emitHeader {
280     my $self=shift;
281     my $status=shift;
282    
283     my $header=undef;
284     if(exists($self->{'HeaderTemplateNumber'}))
285     {
286     my $hn='HeaderTemplate'.$self->{'HeaderTemplateNumber'};
287    
288     $header=$::CONF{$hn};
289     }
290     $header=$::CONF{'HeaderTemplate'} unless(defined($header));
291    
292     $header=~s/~([^~]+)~/
293     if(!defined($1) || $1 eq '')
294     {
295     '~';
296     }
297     elsif($1 eq 'server')
298     {
299     $::PGM;
300     }
301     elsif($1 eq 'status')
302     {
303     $status;
304     }
305     elsif($1 eq 'servertime')
306     {
307     time;
308     }
309     else
310     {
311     '';
312     }
313     /gex;
314    
315     $self->write($header);
316     }
317    
318     sub sendMessage {
319     my $self=shift;
320     my $msg=shift;
321    
322     $self->write($msg);
323    
324     my $msgCount=++$self->{'MessageCount'};
325    
326     my $maxMsg=$::CONF{'MaxMessages'};
327     if(defined($maxMsg) && $maxMsg>0 && $msgCount>=$maxMsg)
328     {
329     $self->close(1);
330     }
331    
332     if($self->{'MaxMessageCount'}>0 && $msgCount>=$self->{'MaxMessageCount'})
333     {
334     $self->close(1);
335     }
336     }
337    
338 knops.gerd 13 sub closeChannel {
339     my $self=shift;
340     my $channelName=shift;
341    
342     return unless(exists($self->{'channels'}->{$channelName}));
343    
344     my $channel=$self->{'channels'}->{$channelName};
345     $channel->removeSubscriber($self);
346    
347     delete($self->{'channels'}->{$channelName});
348    
349     $self->close() if(scalar(keys %{$self->{'channels'}})==0);
350     }
351    
352 knops.gerd 11 sub close {
353     my $self=shift;
354     my $noShutdownMsg=shift;
355    
356 knops.gerd 13 foreach my $channelName (keys %{$self->{'channels'}})
357     {
358     my $channel=$self->{'channels'}->{$channelName};
359     $channel->removeSubscriber($self);
360     }
361     delete($self->{'channels'});
362 knops.gerd 11
363     if(exists($self->{'subscriberID'}))
364     {
365     delete($PersistentConnections{$self->{'subscriberID'}});
366     }
367    
368     #
369     # Send shutdown message unless remote closed or
370     # connection not yet established
371     #
372     unless($noShutdownMsg || $self->{'remoteClosed'} || exists($self->{'headerBuffer'}))
373     {
374     my $msg=$::CONF{'SubscriberShutdownMsg'};
375     if(defined($msg) && $msg ne '')
376     {
377     $self->write($msg);
378     }
379     }
380    
381     $self->SUPER::close();
382     }
383    
384     sub checkForMaxTime {
385     my $self=shift;
386     my $time=shift;
387    
388     $self->close(1) if(exists($self->{'ConnectionTimeLimit'}) && $self->{'ConnectionTimeLimit'}<$time);
389     }
390    
391     1;
392 andrew.betts 3 ############################################################################EOF

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