forked from github/kensanata.oddmuse
74 lines
2.4 KiB
Perl
74 lines
2.4 KiB
Perl
# Copyright (C) 2004 Alex Schroeder <alex@emacswiki.org>
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# 2004 Sebastian Blatt <sblatt@havens.de>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the
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# Free Software Foundation, Inc.
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# 59 Temple Place, Suite 330
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# Boston, MA 02111-1307 USA
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# Limits the number of parallel Oddmuse instances to
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# $InstanceThrottleLimit by keeping track of the process ids in
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# $InstanceThrottleDir
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$ModulesDescription .= '<p>$Id: throttle.pl,v 1.1 2004/07/16 00:40:42 sblatt Exp $</p>';
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use vars qw($InstanceThrottleDir $InstanceThrottleLimit);
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$InstanceThrottleDir = $DataDir."/pids"; # directory for pid files
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$InstanceThrottleLimit = 2; # maximum number of parallel processes
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*OldDoSurgeProtection = *DoSurgeProtection;
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*DoSurgeProtection = *NewDoSurgeProtection;
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*OldDoBrowseRequest = *DoBrowseRequest;
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*DoBrowseRequest = *NewDoBrowseRequest;
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sub NewDoSurgeProtection {
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DoInstanceThrottle();
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CreatePidFile();
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OldDoSurgeProtection();
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}
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sub NewDoBrowseRequest {
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OldDoBrowseRequest();
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RemovePidFile();
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}
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# limit the script to a maximum of $InstanceThrottleLimit instances
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sub DoInstanceThrottle {
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my @pids = glob($InstanceThrottleDir."/*");
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# Go over all pids: validate each pid by sending signal 0, unlink
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# pidfile if pid does not exist and return 0. Count the number of
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# zeros (= removed files = zombies) with grep.
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my $zombies = grep /^0$/,
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(map {/(\d+)$/ and kill 0,$1 or unlink and 0} @pids);
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if (scalar(@pids)-$zombies >= $InstanceThrottleLimit) {
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ReportError(T(sprintf('Too many instances. Only %d allowed.',
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$InstanceThrottleLimit)),
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'503 Service Unavailable');
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}
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}
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sub CreatePidFile {
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CreateDir($InstanceThrottleDir);
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WriteStringToFile("$InstanceThrottleDir/$$", 'lock');
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}
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sub RemovePidFile {
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my $file = "$InstanceThrottleDir/$$";
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unlink $file or
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ReportError(Ts('Failed to remove %s', $file),'500 INTERNAL SERVER ERROR');
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}
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