/[meteor]/googlecode.com/svn/trunk/Meteor/Socket.pm
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Contents of /googlecode.com/svn/trunk/Meteor/Socket.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: 6544 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 # Meteor socket additions
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::Socket;
33 ###############################################################################
34 # Configuration
35 ###############################################################################
36
37 use strict;
38
39 use Socket;
40 use Fcntl qw(F_GETFL F_SETFL O_NONBLOCK);
41 use Errno qw(EINTR);
42
43 BEGIN {
44 $Meteor::Socket::handleNum=0;
45
46 # Cache getprotobyname result as on some systems it is slow.
47 $Meteor::Socket::TCP_PROTO_NAME=getprotobyname('tcp');
48 $Meteor::Socket::UDP_PROTO_NAME=getprotobyname('udp');
49 }
50
51 ###############################################################################
52 # Factory methods
53 ###############################################################################
54 sub new {
55 my $class=shift;
56
57 my $self=$class;
58
59 unless(ref($class))
60 {
61 $self={};
62 bless($self,$class);
63 }
64
65 $self->{'timeout'}=0;
66 $self->{'buffer'}='';
67
68 return $self;
69 }
70
71 sub newWithHandle {
72 my $class=shift;
73
74 my $self=$class->new;
75 $self->{'handle'}=shift;
76
77 my $vec='';
78 vec($vec,CORE::fileno($self->{'handle'}),1)=1;
79 $self->{'handleVec'}=$vec;
80
81 my $timeout=shift;
82 ($timeout) && ($self->{'timeout'}=$timeout);
83
84 return $self;
85 }
86
87 sub newServer {
88 my($class,$port,$queueSize,$srcIP)=@_;
89
90 ($port) || die("$class: port undefined!");
91
92 $queueSize||=5;
93
94 my $self=$class->new;
95
96 my $localAdr=INADDR_ANY;
97 $localAdr=inet_aton($srcIP) if(defined($srcIP) && $srcIP ne '');
98
99 my $local;
100 my $sockType=AF_INET;
101 my $proto=$Meteor::Socket::TCP_PROTO_NAME;
102
103 $self->{'port'}=$port;
104 ($local=sockaddr_in($port,$localAdr))
105 || die("$class: sockaddr_in for port '$port' failed");
106
107 $self->{'handle'}=$self->nextHandle();
108 $self->{'socketType'}=$sockType;
109
110 socket($self->{'handle'},$sockType,SOCK_STREAM,$proto)
111 || die("$class socket: $!");
112
113 setsockopt($self->{'handle'},SOL_SOCKET,SO_REUSEADDR,1);
114
115 bind($self->{'handle'},$local)
116 || die("$class bind: $!");
117 listen($self->{'handle'},$queueSize)
118 || die("$class listen: $!");
119
120 select((select($self->{'handle'}),$|=1)[0]);
121
122 my $vec='';
123 vec($vec,CORE::fileno($self->{'handle'}),1)=1;
124 $self->{'handleVec'}=$vec;
125
126 return $self;
127 }
128
129 sub newUDPServer {
130 my($class,$port,$srcIP)=@_;
131
132 ($port) || die("$class: port undefined!");
133
134 my $self=$class->new;
135
136 my $localAdr=INADDR_ANY;
137 $localAdr=inet_aton($srcIP) if(defined($srcIP) && $srcIP ne '');
138
139 my $local;
140 my $sockType=PF_INET;
141 my $proto=$Meteor::Socket::UDP_PROTO_NAME;
142
143 $self->{'port'}=$port;
144 ($local=sockaddr_in($port,$localAdr))
145 || die("$class: sockaddr_in for port '$port' failed");
146
147 $self->{'handle'}=$self->nextHandle();
148 $self->{'socketType'}=$sockType;
149
150 socket($self->{'handle'},$sockType,SOCK_DGRAM,$proto)
151 || die("$class socket: $!");
152
153 setsockopt($self->{'handle'},SOL_SOCKET,SO_REUSEADDR,pack("l", 1))
154 || die("setsockopt: $!");
155
156 bind($self->{'handle'},$local)
157 || die("$class bind: $!");
158
159 select((select($self->{'handle'}),$|=1)[0]);
160
161 my $vec='';
162 vec($vec,CORE::fileno($self->{'handle'}),1)=1;
163 $self->{'handleVec'}=$vec;
164
165 return $self;
166 }
167
168 ###############################################################################
169 # Instance methods
170 ###############################################################################
171 sub DESTROY {
172 my $self=shift;
173
174 if(exists($self->{'handle'}))
175 {
176 warn("$self->DESTROY caught unclosed socket")
177 unless($Meteor::Socket::NO_WARN_ON_CLOSE);
178 $self->close();
179 }
180 }
181
182 sub conSocket {
183 my $self=shift;
184
185 my $handle=$self->nextHandle();
186
187 my $paddr;
188 $paddr=&saccept($handle,$self->{'handle'}) || die($!);
189
190 select((select($handle),$|=1)[0]);
191
192 my $newSock=Meteor::Socket->newWithHandle($handle,20);
193 $newSock->{'socketType'}=$self->{'socketType'};
194 if($self->{'socketType'}==AF_INET)
195 {
196 my($port,$iaddr)=unpack_sockaddr_in($paddr);
197
198 $newSock->{'connection'}->{'port'}=$port;
199 $newSock->{'connection'}->{'remoteIP'}=inet_ntoa($iaddr);
200 }
201
202 return $newSock;
203 }
204
205 sub setNonBlocking {
206 my $self=shift;
207
208 my $flags=fcntl($self->{'handle'},F_GETFL,0)
209 or die("Can't get flags for the socket: $!");
210 fcntl($self->{'handle'},F_SETFL,$flags|O_NONBLOCK)
211 or die("Can't set flags for the socket: $!");
212 }
213
214 sub close {
215 my $self=shift;
216
217 if(exists($self->{'handle'}))
218 {
219 close($self->{'handle'});
220 delete($self->{'handle'});
221 }
222 }
223
224 ###############################################################################
225 # Utility functions
226 ###############################################################################
227 sub nextHandle {
228 no strict 'refs';
229
230 my $name='MSHandle'.$Meteor::Socket::handleNum++;
231 my $pack='Meteor::Socket::';
232 my $handle=\*{$pack.$name};
233 delete $$pack{$name};
234
235 $handle;
236 }
237
238 sub sselect {
239 my $result;
240 my $to=$_[3];
241 my $time=time;
242 while(1)
243 {
244 $result=CORE::select($_[0],$_[1],$_[2],$to);
245 if($result<0)
246 {
247 last unless(${!}==EINTR);
248 return 0 if($::HUP || $::TERM || $::USR1 || $::USR2);
249 my $tn=time;
250 $to-=($tn-$time);
251 $time=$tn;
252 $to=1 if($to<1);
253 }
254 else
255 {
256 last;
257 }
258 }
259
260 $result;
261 }
262
263 sub saccept {
264 my($dhandle,$shandle)=@_;
265
266 my $result;
267 while(1)
268 {
269 $result=CORE::accept($dhandle,$shandle);
270 unless($result)
271 {
272 last unless(${!}==EINTR);
273 return 0 if($::HUP || $::TERM || $::USR1 || $::USR2);
274 }
275 else
276 {
277 last;
278 }
279 }
280
281 $result;
282 }
283
284 sub fileno {
285 CORE::fileno(shift->{'handle'});
286 }
287
288 1;
289 ############################################################################EOF

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