/[meteor]/googlecode.com/svn/trunk/Meteor/Controller.pm
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Contents of /googlecode.com/svn/trunk/Meteor/Controller.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: 5990 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 # A Meteor Controller
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::Controller;
33 ###############################################################################
34 # Configuration
35 ###############################################################################
36
37 use strict;
38
39 use Meteor::Connection;
40 use Meteor::Channel;
41 use Meteor::Subscriber;
42
43 @Meteor::Controller::ISA=qw(Meteor::Connection);
44
45 ###############################################################################
46 # Factory methods
47 ###############################################################################
48 sub newFromServer {
49 my $class=shift;
50
51 my $self=$class->SUPER::newFromServer(shift);
52
53 $::Statistics->{'current_controllers'}++;
54 $::Statistics->{'controller_connections_accepted'}++;
55
56 $self;
57 }
58
59 ###############################################################################
60 # Instance methods
61 ###############################################################################
62 sub processLine {
63 my $self=shift;
64 my $line=shift;
65
66 # ADDMESSAGE channel1 Message text
67 # < OK
68 # ADDMESSAGE
69 # < ERR Invalid command syntax
70 # COUNTSUBSCRIBERS channel1
71 # < OK 344
72
73 unless($line=~s/^(ADDMESSAGE|COUNTSUBSCRIBERS|LISTCHANNELS|LISTSUBSCRIBERS|LISTCONNECTIONS|DESCRIBE|SHOWSTATS|QUIT)//)
74 {
75 $self->write("ERR Invalid command syntax$::CRLF");
76
77 return;
78 }
79
80 my $cmd=$1;
81
82 if($cmd eq 'ADDMESSAGE')
83 {
84 unless($line=~s/^\s+(\S+)\s//)
85 {
86 $self->write("ERR Invalid command syntax$::CRLF");
87
88 return;
89 }
90
91 my $channelName=$1;
92 my $channel=Meteor::Channel->channelWithName($channelName);
93 my $msg=$channel->addMessage($line);
94 my $msgID=$msg->id();
95 $self->write("OK\t$msgID$::CRLF");
96 }
97 elsif($cmd eq 'COUNTSUBSCRIBERS')
98 {
99 unless($line=~s/^\s+(\S+)$//)
100 {
101 $self->write("ERR Invalid command syntax$::CRLF");
102 return;
103 }
104
105 my $channelName=$1;
106 my $numSubscribers=0;
107 my $channel=Meteor::Channel->channelWithName($channelName,1);
108 $numSubscribers=$channel->subscriberCount() if($channel);
109
110 $self->write("OK $numSubscribers$::CRLF");
111 }
112 elsif($cmd eq 'LISTCHANNELS')
113 {
114 unless($line eq '')
115 {
116 $self->write("ERR Invalid command syntax$::CRLF");
117 return;
118 }
119
120 my $txt="OK$::CRLF".Meteor::Channel->listChannels()."--EOT--$::CRLF";
121
122 $self->write($txt);
123 }
124 elsif($cmd eq 'LISTSUBSCRIBERS')
125 {
126 unless($line eq '')
127 {
128 $self->write("ERR Invalid command syntax$::CRLF");
129 return;
130 }
131
132 my $txt="OK$::CRLF".Meteor::Subscriber->listSubscribers()."--EOT--$::CRLF";
133
134 $self->write($txt);
135 }
136 elsif($cmd eq 'LISTCONNECTIONS')
137 {
138 unless($line eq '')
139 {
140 $self->write("ERR Invalid command syntax$::CRLF");
141 return;
142 }
143
144 my $txt="OK$::CRLF".Meteor::Connection->listConnections()."--EOT--$::CRLF";
145
146 $self->write($txt);
147 }
148 elsif($cmd eq 'DESCRIBE')
149 {
150 unless($line=~s/^\s+(\S+)$//)
151 {
152 $self->write("ERR Invalid command syntax$::CRLF");
153 return;
154 }
155
156 my $filenum=$1;
157 my $condesc=Meteor::Connection->describeConnWithFileNum($filenum);
158 if ($condesc != -1) {
159 $self->write("OK$::CRLF");
160 $self->write($condesc);
161 $self->write("--EOT--$::CRLF");
162
163 } else {
164 $self->write("ERR Unknown client$::CRLF");
165 }
166 }
167 elsif($cmd eq 'SHOWSTATS')
168 {
169 # uptime
170 my $uptime=time-$::STARTUP_TIME;
171 my $txt="OK$::CRLF"."uptime: $uptime$::CRLF";
172
173 # channel_count
174 my $numChannels=Meteor::Channel->numChannels();
175 $txt.="channel_count: $numChannels$::CRLF";
176
177 # connection_count
178 my $numConnections=Meteor::Connection->connectionCount();
179 $txt.="connection_count: $numConnections$::CRLF";
180
181 # subscriber count = current_subscribers + number of pollers in last minute
182 my $now = time; my $numpoll = 0;
183 foreach my $key (keys %{$::Pollers}) {
184 if($::Pollers->{$key} < ($now-60) || Meteor::Subscriber->subscriberExists($key)) {
185 delete $::Pollers->{$key};
186 } else {
187 $numpoll++;
188 }
189 }
190 my $numsub = 0;
191 if (exists($::Statistics->{'current_subscribers'})) {
192 $numsub = $::Statistics->{'current_subscribers'};
193 }
194 $txt.="real_subscribers: ".($numpoll+$numsub)."$::CRLF";
195
196 foreach my $key (keys %{$::Statistics})
197 {
198 $txt.=$key.': '.$::Statistics->{$key}.$::CRLF;
199 }
200
201 $txt.="--EOT--$::CRLF";
202
203 $self->write($txt);
204 }
205 elsif($cmd eq 'QUIT')
206 {
207 unless($line eq '')
208 {
209 $self->write("ERR Invalid command syntax$::CRLF");
210
211 return;
212 }
213
214 $self->write("OK$::CRLF");
215 $self->close(1);
216 }
217 else
218 {
219 # Should never get here
220 die("Unknown command '$cmd'");
221 }
222 }
223
224 sub close {
225 my $self=shift;
226 my $noShutdownMsg=shift;
227
228 unless($noShutdownMsg || $self->{'remoteClosed'})
229 {
230 my $msg=$::CONF{'ControllerShutdownMsg'};
231 if(defined($msg) && $msg ne '')
232 {
233 $self->write($msg);
234 }
235 }
236
237 $self->SUPER::close();
238 }
239
240 sub didClose {
241
242 $::Statistics->{'current_controllers'}--;
243 }
244
245 1;
246 ############################################################################EOF

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