/[meteor]/googlecode.com/svn/trunk/Meteor/Connection.pm
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Contents of /googlecode.com/svn/trunk/Meteor/Connection.pm

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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: 9213 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 # Subscriber.pm
8 #
9 # Description:
10 # Common super-class for controller and 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::Connection;
33 ###############################################################################
34 # Configuration
35 ###############################################################################
36
37 use strict;
38
39 use Errno qw(EAGAIN);
40
41 our $MAX_READ_SIZE=8192;
42 our $CONNECTION_WRITE_TIMEOUT=120;
43
44 our @Connections=();
45
46 ###############################################################################
47 # Class methods
48 ###############################################################################
49 sub addAllHandleBits {
50 my $class=shift;
51
52 my $rVecRef=shift;
53 my $wVecRef=shift;
54 my $eVecRef=shift;
55 my @cons=@Connections;
56 map {$_->addHandleBits($rVecRef,$wVecRef,$eVecRef) if(defined($_)) } @cons;
57 }
58
59 sub checkAllHandleBits {
60 my $class=shift;
61
62 my $rVec=shift;
63 my $wVec=shift;
64 my $eVec=shift;
65
66 my @cons=@Connections;
67 map {$_->checkHandleBits($rVec,$wVec,$eVec) if(defined($_)) } @cons;
68 }
69
70 sub connectionCount {
71 scalar(@Connections);
72 }
73
74 sub closeAllConnections {
75 my @cons=@Connections;
76
77 map { $_->close(); } @cons;
78 }
79
80 sub listConnections {
81 my $class=shift;
82 my $list='';
83 foreach my $conn (@Connections) {
84 $list .= $conn->{'socketFN'}.' '.$conn->{'ip'}.' '.$conn->{'type'};
85 if (exists($conn->{'subscriberID'})) {
86 $list .= ' '.$conn->{'subscriberID'};
87 }
88 $list .= "$::CRLF";
89 }
90 $list;
91 }
92
93 sub describeConnWithFileNum {
94 my $class=shift;
95 my $filenum=shift;
96 foreach my $conn (@Connections) {
97 if ($conn->{'socketFN'}==$filenum) {
98 my $ret = "";
99 if (exists($conn->{'socketFN'})) {
100 $ret .= "socketFN: ".$conn->{'socketFN'}."$::CRLF";
101 }
102 if (exists($conn->{'connectionStart'})) {
103 $ret .= "connectionStart: ".$conn->{'connectionStart'}."$::CRLF";
104 }
105 if (exists($conn->{'writeBuffer'})) {
106 $ret .= "writeBuffer: ".$conn->{'writeBuffer'}."$::CRLF";
107 }
108 if (exists($conn->{'readBuffer'})) {
109 $ret .= "readBuffer: ".$conn->{'readBuffer'}."$::CRLF";
110 }
111 if (exists($conn->{'bytesWritten'})) {
112 $ret .= "bytesWritten: ".$conn->{'bytesWritten'}."$::CRLF";
113 }
114 if (exists($conn->{'type'})) {
115 $ret .= "type: ".$conn->{'type'}."$::CRLF";
116 }
117 if (exists($conn->{'mode'})) {
118 $ret .= "mode: ".$conn->{'mode'}."$::CRLF";
119 }
120 if (exists($conn->{'ip'})) {
121 $ret .= "ip: ".$conn->{'ip'}."$::CRLF";
122 }
123 if (exists($conn->{'headerBuffer'})) {
124 $ret .= "headerBuffer: ".$conn->{'headerBuffer'}."$::CRLF";
125 }
126 if (exists($conn->{'messageCount'})) {
127 $ret .= "messageCount: ".$conn->{'messageCount'}."$::CRLF";
128 }
129 if (exists($conn->{'connectionStart'})) {
130 $ret .= "age: ".(time-$conn->{'connectionStart'})."$::CRLF";
131 }
132 if (exists($conn->{'connectionTimeLimit'})) {
133 $ret .= "connectionTimeLimit: ".$conn->{'connectionTimeLimit'}."$::CRLF";
134 }
135 if (exists($conn->{'useragent'})) {
136 $ret .= "useragent: ".$conn->{'useragent'}."$::CRLF";
137 }
138 if (exists($conn->{'subscriberID'})) {
139 $ret .= "subscriberID: ".$conn->{'subscriberID'}."$::CRLF";
140 }
141 return $ret;
142 }
143 }
144 return -1;
145 }
146
147 sub destroyBadRequests {
148 foreach my $conn (@Connections) {
149 if (time-$conn->{'connectionStart'} > 30 && !exists($conn->{'subscriberID'}) && $conn->{'type'} eq 'Meteor::Subscriber') {
150 &::syslog('debug',"Closing misbehaving subscriber %s",$conn->{'socketFN'});
151 $conn->close();
152 }
153 }
154 }
155
156 ###############################################################################
157 # Factory methods
158 ###############################################################################
159 sub new {
160 #
161 # Create a new empty instance
162 #
163 my $class=shift;
164
165 my $obj={};
166
167 bless($obj,$class);
168 }
169
170 sub newFromServer {
171 #
172 # new instance from new server connection
173 #
174 my $self=shift->new();
175
176 $::Statistics->{'total_requests'}++;
177
178 my $server=shift;
179 my $socket=$server->conSocket();
180
181 $self->{'socket'}=$socket;
182 $self->{'socketFN'}=$socket->fileno();
183 $self->{'connectionStart'}=time;
184
185 $socket->setNonBlocking();
186
187 $self->{'writeBuffer'}='';
188 $self->{'readBuffer'}='';
189 $self->{'bytesWritten'}=0;
190 $self->{'type'}=ref($self);
191 $self->{'ip'}=$socket->{'connection'}->{'remoteIP'};
192
193 push(@Connections,$self);
194
195 &::syslog('debug',"New %s for %s using file number %s",ref($self),$self->{'ip'},$self->{'socketFN'});
196
197 $self;
198 }
199
200 ###############################################################################
201 # Instance methods
202 ###############################################################################
203 sub write {
204 my $self=shift;
205
206 $self->{'writeBuffer'}.=shift;
207 $self->{'writeBufferTimestamp'}=time unless(exists($self->{'writeBufferTimestamp'}));
208 }
209
210 sub addHandleBits {
211 my $self=shift;
212
213 my $rVecRef=shift;
214 my $wVecRef=shift;
215 my $eVecRef=shift;
216
217 my $fno=$self->{'socketFN'};
218
219 if($self->{'writeBuffer'} ne '')
220 {
221 if(exists($self->{'writeBufferTimestamp'}) && $self->{'writeBufferTimestamp'}+$CONNECTION_WRITE_TIMEOUT<time)
222 {
223 &::syslog('debug',"%s for %s: write timed out",ref($self),$self->{'socket'}->{'connection'}->{'remoteIP'});
224
225 $self->{'writeBuffer'}='';
226 $self->close();
227 return;
228 }
229 vec($$wVecRef,$fno,1)=1;
230 }
231
232 vec($$rVecRef,$fno,1)=1;
233 vec($$eVecRef,$fno,1)=1;
234 }
235
236 sub checkHandleBits {
237 my $self=shift;
238
239 my $rVec=shift;
240 my $wVec=shift;
241 my $eVec=shift;
242
243 my $fno=$self->{'socketFN'};
244
245 if(vec($eVec,$fno,1))
246 {
247 #
248 # Something went wrong!
249 #
250 $self->exceptionReceived();
251
252 return;
253 }
254
255 if(vec($rVec,$fno,1))
256 {
257 #
258 # Data available for read
259 #
260 my $socket=$self->{'socket'};
261
262 my $buffer='';
263 my $bytesRead=sysread($socket->{'handle'},$buffer,$MAX_READ_SIZE);
264 if(defined($bytesRead) && $bytesRead>0)
265 {
266 $::Statistics->{'total_inbound_bytes'}+=$bytesRead;
267 $self->{'readBuffer'}.=$buffer;
268 while($self->{'readBuffer'}=~s/^([^\r\n]*)\r?\n//)
269 {
270 $self->processLine($1);
271 }
272 }
273 elsif(defined($bytesRead) && $bytesRead==0)
274 {
275 # Connection closed
276 $self->{'remoteClosed'}=1;
277 $self->close(1, 'remoteClosed');
278
279 return;
280 }
281 else
282 {
283 unless(${!}==EAGAIN)
284 {
285 &::syslog('notice',"Connection closed: $!");
286 $self->{'remoteClosed'}=1;
287 $self->close(1, 'remoteClosed');
288
289 return;
290 }
291 }
292 }
293
294 if(vec($wVec,$fno,1) && $self->{'writeBuffer'} ne '')
295 {
296 #
297 # Can write
298 #
299 my $socket=$self->{'socket'};
300
301 my $bytesWritten=syswrite($socket->{'handle'},$self->{'writeBuffer'});
302
303 if(defined($bytesWritten) && $bytesWritten>0)
304 {
305 $::Statistics->{'total_outbound_bytes'}+=$bytesWritten;
306 $self->{'bytesWritten'}+=$bytesWritten;
307 $self->{'writeBuffer'}=substr($self->{'writeBuffer'},$bytesWritten);
308 if(length($self->{'writeBuffer'})==0)
309 {
310 delete($self->{'writeBufferTimestamp'});
311 $self->close(1) if(exists($self->{'autoClose'}));
312 }
313 else
314 {
315 $self->{'writeBufferTimestamp'}=time;
316 }
317 }
318 else
319 {
320 unless(${!}==EAGAIN)
321 {
322 &::syslog('notice',"Connection closed: $!");
323 $self->{'remoteClosed'}=1;
324 $self->close(1, 'remoteClosed');
325
326 return;
327 }
328 }
329 }
330 }
331
332 sub exceptionReceived {
333 my $self=shift;
334
335 $self->{'writeBuffer'}='';
336
337 $self->close();
338 }
339
340 sub close {
341 my $self=shift;
342
343 #&::syslog('debug',"Close called for %s for %s when write buffer empty",ref($self),$self->{'socket'}->{'connection'}->{'remoteIP'});
344
345 unless($self->{'remoteClosed'})
346 {
347 if(!exists($self->{'autoClose'}) && length($self->{'writeBuffer'})>0)
348 {
349 $self->{'autoClose'}=1;
350
351 &::syslog('debug',"Will close %s for %s when write buffer empty",ref($self),$self->{'socket'}->{'connection'}->{'remoteIP'});
352
353 return;
354 }
355 }
356
357 eval {
358 $self->{'socket'}->close();
359 };
360
361 #
362 # Remove connection from list of connections
363 #
364 my $idx=undef;
365 my $numcon = scalar(@Connections);
366 for(my $i=0;$i<$numcon;$i++)
367 {
368 if($Connections[$i]==$self)
369 {
370 $idx=$i;
371 last;
372 }
373 }
374
375 if(defined($idx))
376 {
377 splice(@Connections,$idx,1);
378 }
379
380 &::syslog('debug',"Closed %s for %s",ref($self),$self->{'socket'}->{'connection'}->{'remoteIP'});
381
382 $self->didClose();
383 }
384
385 sub didClose {
386 }
387
388 1;
389 ############################################################################EOF

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