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

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Revision 64 - (hide annotations)
Mon Jan 19 11:19:41 2009 UTC (11 years, 2 months ago) by andrew.betts
File size: 7994 byte(s)
Release 1.06.04 as documented in Google Group

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 andrew.betts 62 # Channel.pm
8 knops.gerd 11 #
9     # Description:
10     # A Meteor Channel
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::Channel;
33     ###############################################################################
34     # Configuration
35     ###############################################################################
36    
37     use strict;
38    
39     use Meteor::Message;
40    
41     our %Channels=();
42     our $MessageID=0;
43    
44     ###############################################################################
45     # Class methods
46     ###############################################################################
47     sub channelWithName {
48     my $class=shift;
49     my $channelName=shift;
50     my $avoidCreation=shift;
51    
52     unless(exists($Channels{$channelName}))
53     {
54     return undef if($avoidCreation);
55     #
56     # Create new channel
57     #
58     $Channels{$channelName}=$class->newChannel($channelName);
59    
60     &::syslog('debug',"New channel $channelName");
61     }
62    
63     return $Channels{$channelName};
64     }
65    
66     sub listChannels {
67     my $class=shift;
68    
69     my $list='';
70     foreach my $channelName (sort keys %Channels)
71     {
72     my $channel=$Channels{$channelName};
73    
74     $list.=$channelName.'('.$channel->messageCount().'/'.$channel->subscriberCount().")$::CRLF";
75     }
76    
77     $list;
78     }
79    
80     sub deleteChannel {
81     my $class=shift;
82     my $channelName=shift;
83    
84     delete($Channels{$channelName});
85     }
86    
87     sub trimMessageStoresByTimestamp {
88     my $class=shift;
89     my $minTimeStamp=shift;
90    
91     return unless($minTimeStamp);
92    
93     map { $_->trimMessageStoreByTimestamp($minTimeStamp) } (values %Channels);
94     }
95    
96     sub clearAllBuffers {
97     my $class=shift;
98    
99     map { $_->clearBuffer() } (values %Channels);
100     }
101    
102 knops.gerd 25 sub numChannels {
103    
104     return scalar(keys %Channels);
105     }
106    
107 knops.gerd 11 ###############################################################################
108     # Factory methods
109     ###############################################################################
110     sub new {
111     #
112     # Create a new empty instance
113     #
114     my $class=shift;
115    
116     my $obj={};
117    
118     bless($obj,$class);
119     }
120    
121     sub newChannel {
122     #
123     # new instance from new server connection
124     #
125     my $self=shift->new();
126    
127     my $name=shift;
128     $self->{'name'}=$name;
129    
130     $self->{'subscribers'}=[];
131     $self->{'messages'}=[];
132    
133     $self;
134     }
135    
136     sub DESTROY {
137     my $self=shift;
138    
139     my @subscribers=@{$self->{'subscribers'}};
140 knops.gerd 13 map { $_->closeChannel($self->{'name'}) } @subscribers;
141 knops.gerd 11 }
142    
143     ###############################################################################
144     # Instance methods
145     ###############################################################################
146     sub name {
147     shift->{'name'};
148     }
149    
150     sub addSubscriber {
151     my $self=shift;
152     my $subscriber=shift;
153     my $startId=shift;
154     my $persist=shift;
155 knops.gerd 47 my $mode=shift || '';
156     my $userAgent=shift || '';
157 knops.gerd 11
158     # Note: negative $startId means go back that many messages
159 andrew.betts 50 my $startIndex=$self->indexForMessageID($startId);
160     my $logStartIndex = $startIndex || $self->lastMsgID() || 0;
161 knops.gerd 11
162     push(@{$self->{'subscribers'}},$subscriber) if($persist);
163    
164 knops.gerd 47 &::syslog('info','',
165     'joinchannel',
166 andrew.betts 62 $subscriber->{'socketFN'},
167 knops.gerd 47 $self->{'name'},
168 andrew.betts 62 $logStartIndex
169 knops.gerd 47 );
170    
171 knops.gerd 11 return unless(defined($startIndex));
172    
173     my $msgCount=scalar(@{$self->{'messages'}});
174     my $txt='';
175    
176     $startIndex=0 if($startIndex<0);
177    
178 andrew.betts 50 if($startIndex<$msgCount) {
179     $subscriber->sendMessages(@{$self->{'messages'}}[$startIndex..$msgCount-1]);
180 knops.gerd 11 }
181     }
182    
183     sub removeSubscriber {
184     my $self=shift;
185     my $subscriber=shift;
186 knops.gerd 47 my $reason=shift ||'unknown';
187 knops.gerd 11
188     my $idx=undef;
189 andrew.betts 50 my $numsubs = scalar(@{$self->{'subscribers'}});
190 andrew.betts 53
191     for (my $i=0; $i<$numsubs; $i++) {
192     if($self->{'subscribers'}->[$i]==$subscriber) {
193 knops.gerd 11 $idx=$i;
194     last;
195     }
196     }
197    
198     if(defined($idx))
199     {
200     splice(@{$self->{'subscribers'}},$idx,1);
201 knops.gerd 47
202 andrew.betts 62 my $timeConnected = time - $subscriber->{'connectionStart'};
203 knops.gerd 47 &::syslog('info','',
204     'leavechannel',
205 andrew.betts 64 $subscriber->{'socketFN'},
206     $self->{'name'},
207 andrew.betts 53 $subscriber->{'ip'},
208 knops.gerd 47 $subscriber->{'subscriberID'},
209 andrew.betts 50 $timeConnected,
210 andrew.betts 62 $subscriber->{'messageCount'},
211 knops.gerd 47 $subscriber->{'bytesWritten'},
212     $reason
213     );
214 knops.gerd 11 }
215    
216     $self->checkExpiration();
217     }
218    
219     sub subscriberCount {
220     my $self=shift;
221    
222     scalar(@{$self->{'subscribers'}});
223     }
224    
225     sub addMessage {
226     my $self=shift;
227     my $messageText=shift;
228    
229     my $message=Meteor::Message->newWithID($MessageID++);
230 knops.gerd 16 $message->setText($messageText);
231     $message->setChannelName($self->{'name'});
232 knops.gerd 11 push(@{$self->{'messages'}},$message);
233 andrew.betts 50 &::syslog('debug',"New message ".$message->{"id"}." on channel ".$self->{'name'});
234 knops.gerd 11
235     $self->trimMessageStoreBySize();
236    
237 knops.gerd 45 map { $_->sendMessages($message) } @{$self->{'subscribers'}};
238 knops.gerd 46
239     $message;
240 knops.gerd 11 }
241    
242     sub messageCount {
243     my $self=shift;
244    
245     scalar(@{$self->{'messages'}});
246     }
247    
248     sub trimMessageStoreBySize {
249     my $self=shift;
250    
251     my $numMessages=scalar(@{$self->{'messages'}});
252    
253     if($numMessages>$::CONF{'MaxMessagesPerChannel'})
254     {
255     splice(@{$self->{'messages'}},0,-$::CONF{'MaxMessagesPerChannel'});
256     }
257     }
258    
259     sub trimMessageStoreByTimestamp {
260     my $self=shift;
261     my $ts=shift;
262    
263     while(scalar(@{$self->{'messages'}})>0 && $self->{'messages'}->[0]->timestamp()<$ts)
264     {
265     my $msg=shift(@{$self->{'messages'}});
266     }
267    
268     $self->checkExpiration();
269     }
270    
271     sub clearBuffer {
272     my $self=shift;
273    
274     $self->{'messages'}=[];
275    
276     $self->checkExpiration();
277     }
278    
279     sub checkExpiration {
280     my $self=shift;
281    
282     if($self->messageCount()==0 && $self->subscriberCount()==0)
283     {
284     my $name=$self->name();
285     &::syslog('debug',"Channel expired: $name");
286     $self->deleteChannel($name);
287     }
288     }
289    
290     sub indexForMessageID {
291     my $self=shift;
292     my $id=shift;
293    
294     # the messages is always sorted by ID, so we can
295     # use a binary search to find the message.
296     # return undef if there are no messages or the
297     # ID is that of the last message.
298     # Otherwise return the ID of the found message
299     # of if no message with that ID exists the one
300     # with the next higher ID
301     #
302     return undef unless(defined($id));
303    
304 knops.gerd 46 my $numMessages=scalar(@{$self->{'messages'}});
305 knops.gerd 11
306     return undef unless($numMessages);
307     return -1 unless($id ne '');
308    
309     # Note: negative $id means go back that many messages
310     return $numMessages+$id if($id<0);
311    
312     my $low=0;
313     my $high=$numMessages-1;
314     my $mid;
315     my $cond;
316     while($low<=$high)
317     {
318     $mid=($low+$high)>>1;
319     $cond=$id <=> $self->{'messages'}->[$mid]->id();
320     if($cond<0)
321     {
322     $high=$mid-1;
323     }
324     elsif($cond>0)
325     {
326     $low=$mid+1;
327     }
328     else
329     {
330     return $mid;
331     }
332     }
333    
334     return undef if($low>=$numMessages);
335    
336     return $low;
337     }
338    
339 knops.gerd 46 sub lastMsgID {
340     my $self=shift;
341     my $numMessages=scalar(@{$self->{'messages'}});
342 andrew.betts 50 return undef unless($numMessages>0);
343 knops.gerd 46 @{$self->{'messages'}}[-1]->id();
344     }
345    
346 knops.gerd 45 sub descriptionWithTemplate {
347     my $self=shift;
348     my $template=shift;
349    
350 andrew.betts 53 return '' unless(defined($template) && $template ne '');
351    
352 knops.gerd 45 $template=~s/~([a-zA-Z0-9_]*)~/
353 andrew.betts 50 if(!defined($1) || $1 eq '') {
354 knops.gerd 45 '~';
355 andrew.betts 50 } elsif($1 eq 'messageCount') {
356 knops.gerd 45 $self->messageCount();
357 andrew.betts 50 } elsif($1 eq 'subscriberCount') {
358 knops.gerd 45 $self->subscriberCount();
359 andrew.betts 50 } elsif($1 eq 'lastMsgID') {
360 andrew.betts 58 $self->lastMsgID() || 1;
361 andrew.betts 50 } elsif($1 eq 'name') {
362     $self->{'name'};
363     } else {
364 knops.gerd 45 '';
365     }
366     /gex;
367    
368     $template;
369     }
370    
371 knops.gerd 11 1;
372 andrew.betts 3 ############################################################################EOF

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