#!/usr/bin/perl
$|=1;
# The LearningOnline Network with CAPA
# Cluster Status
# (Versions
# (Running loncron
# 09/06/01 Gerd Kortemeyer)
# 02/18/02,02/19/02 Gerd Kortemeyer)
use lib '/home/httpd/lib/perl/';
use LONCAPA::Configuration;
use LWP::UserAgent();
use HTTP::Headers;
use IO::File;
my %host=();
my $oneday=60*60*24;
my %connectionstatus=();
sub key {
my ($local,$url)=@_;
my $key=$local.'_'.$url;
$key=~s/\W/\_/gs;
return $key;
}
sub hidden {
my ($name,$value)=@_;
print "\n<input type='hidden' name='$name' value='$value' />";
}
sub request {
my ($local,$url,$cachetime)=@_;
my $key=&key($local,$url);
my $reply='';
if ($FORM{$key.'_time'}) {
if ((time-$FORM{$key.'_time'})<$cachetime) {
$reply=$FORM{$key};
&hidden($key.'_time',$FORM{$key.'_time'});
&hidden($key.'_fromcache',1);
}
}
unless ($reply) {
unless ($hostname{$local}) {
$reply='local_unknown';
} else {
my $ua=new LWP::UserAgent(timeout => 20);
my $request=new HTTP::Request('GET',
"http://".$hostname{$local}.$url);
$request->authorization_basic('lonadm','litelite');
my $response=$ua->request($request);
unless ($response->is_success) {
$reply='local_error';
} else {
$reply=$response->content;
chomp($reply);
}
}
&hidden($key.'_time',time);
}
&hidden($key,$reply);
return $reply;
}
# ============================================= Are local and remote connected?
sub connected {
my ($local,$remote)=@_;
$local=~s/\W//g;
$remote=~s/\W//g;
unless ($hostname{$remote}) { return 'remote_unknown'; }
my $url='/cgi-bin/ping.pl?'.$remote;
#
# Slowly phase this in: if not cached, only do 10 percent of the cases
#
unless ($FORM{&key($local,$url)}) {
unless (rand>0.9) { return 'not_yet'; }
}
#
# Actually do the query
#
&statuslist($local,'connecting '.$remote);
my $reply=&request($local,$url,1800);
$reply=(split("\n",$reply))[0];
$reply=~s/\W//g;
if ($reply ne $remote) { return $reply; }
return 'ok';
}
# ============================================================ Get a reply hash
sub replyhash {
my %returnhash=();
foreach (split(/\&/,&request(@_))) {
my ($name,$value)=split(/\=/,$_);
if ($name) {
unless ($value) { $value=''; }
$returnhash{$name}=$value;
}
}
return %returnhash;
}
# ========================================================== Show server status
sub otherwindow {
my ($local,$url,$label)=@_;
return
"<a href='http://$hostname{$local}$url' target='newwin$local'>$label</a>";
}
sub serverstatus {
my $local=shift;
print "\n<hr /><h3>$local $hostdom{$local} ($hostname{$local}; $hostrole{$local})</h3>\n";
# checkrpms
if ($host{$local.'_checkrpms'}) {
print "<br />RPMs: ".$host{$local.'_checkrpms'}
}
# mysql
if ($host{$local.'_mysql'}) {
print "<br />MySQL Database: ".$host{$local.'_mysql'}
}
}
# ====================================================================== Status
sub statuslist {
my ($local,$what)=@_;
print
"<script>document.prgstat.progress.value='Testing $local ($hostname{$local}): $what';</script>\n";
}
#
# Main program
#
# ========================================================= Get form parameters
my $buffer;
read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
my @pairs=split(/&/,$buffer);
my $pair; my $name; my $value;
undef %FORM;
%FORM=();
foreach $pair (@pairs) {
($name,$value) = split(/=/,$pair);
$value =~ tr/+/ /;
$value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
$FORM{$name}=$value;
}
$buffer=$ENV{'QUERY_STRING'};
@pairs=split(/&/,$buffer);
foreach $pair (@pairs) {
($name,$value) = split(/=/,$pair);
$value =~ tr/+/ /;
$value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
$FORM{$name}=$value;
}
# ====================================================== Determine refresh rate
my $refresh=(($FORM{'refresh'}=~/^\d+$/)?$FORM{'refresh'}:60);
if ($refresh<30) { $refresh=30; }
my $starttime=time;
# ================================================================ Send Headers
print "Content-type: text/html\n\n".
"<html><body bgcolor=#FFFFFF>\n";
# -------------------- Read loncapa.conf (and by default, loncapa_apache.conf).
my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
my %perlvar=%{$perlvarref};
undef $perlvarref; # remove since sensitive and not needed
delete $perlvar{'lonReceipt'}; # remove since sensitive and not needed
delete $perlvar{'lonSqlAccess'}; # remove since sensitive and not needed
# ------------------------------------------------------------- Read hosts file
{
my $config=IO::File->new("$perlvar{'lonTabDir'}/hosts.tab");
$total=0;
while (my $configline=<$config>) {
$configline=~s/#.*$//;
unless ($configline=~/\w/) { next; }
my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
$hostname{$id}=$name;
$hostdom{$id}=$domain;
$hostrole{$id}=$role;
$hostip{$id}=$ip;
$total++;
if (($role eq 'library') && ($id ne $perlvar{'lonHostID'})) {
$libserv{$id}=$name;
}
}
}
print "<h1>Cluster Status ".localtime()."</h1>";
print "<form name='prgstat'>\n".
"<input type='text' name='progress' value='Starting ...' size='100' /><br />".
"</form>\n";;
print "<form name='status' method='post'>\n";
&hidden('refresh',$refresh);
# ==================================================== Main Loop over all Hosts
foreach $local (sort keys %hostname) {
# -- Check general status
&statuslist($local,'General');
my %loncron=&replyhash($local,'/lon-status/loncron_simple.txt',1200);
if (defined($loncron{'local_error'})) {
$host{$local.'_loncron'}='Could not determine.';
} else {
if ((time-$loncron{'time'})>$oneday) {
$host{$local.'_loncron'}='Stale.';
} else {
}
}
# -- Check user status
&statuslist($local,'Users');
my %userstatus=&replyhash($local,'/cgi-bin/userstatus.pl?simple',600);
if (defined($userstatus{'local_error'})) {
$host{$local.'_userstatus'}='Could not determine.';
} else {
}
# -- Check mysql status
&statuslist($local,'Database');
my %mysql=&replyhash($local,'/lon-status/mysql.txt',1200);
if (defined($mysql{'local_error'})) {
$host{$local.'_mysql'}='Could not determine.';
} else {
if ((time-$mysql{'time'})>(7*$oneday)) {
if ($hostrole{$local} eq 'library') {
$host{$local.'_mysql'}='Stale.';
$host{$local.'_mysql_doomed'}=1;
}
if ($mysql{'mysql'} eq 'defunct') {
$host{$local.'_mysql'}='Defunct (maybe stale).';
$host{$local.'_mysql_doomed'}=2;
}
} elsif ($mysql{'mysql'} eq 'defunct') {
$host{$local.'_mysql'}='Defunct.';
$host{$local.'_mysql_doomed'}=3;
}
}
# -- Check rpm status
&statuslist($local,'RPMs');
my %checkrpms=&replyhash($local,'/lon-status/checkrpms.txt',2400);
if (defined($checkrpms{'local_error'})) {
$host{$local.'_checkrpms'}='Could not determine.';
} else {
if ((time-$checkrpms{'time'})>(4*$oneday)) {
$host{$local.'_checkrpms'}='Stale.';
$host{$local.'_checkrpms_doomed'}=50;
} elsif ($checkrpms{'status'} eq 'fail') {
$host{$local.'_checkrpms'}='Could not checked RPMs.';
$host{$local.'_checkrpms_doomed'}=100;
} elsif ($checkrpms{'rpmcount'}) {
$host{$local.'_checkrpms'}='Outdated RPMs: '.
$checkrpms{'rpmcount'};
$host{$local.'_checkrpms_doomed'}=$checkrpms{'rpmcount'};
}
}
# -- Check connections
&statuslist($local,'Connections');
$host{$local.'_notconnected'}='';
$host{$local.'_notconnected_doomed'}=0;
foreach $remote (sort keys %hostname) {
my $status=&connected($local,$remote);
$connectionstatus{$local.'_TO_'.$remote}=$status;
unless (($status eq 'ok') || ($status eq 'not_yet')) {
$host{$local.'_notconnected'}.=' '.$remote;
$host{$local.'_notconnected_doomed'}++;
}
}
# Eventually, use doomed count
&serverstatus($local);
}
# =============================================================== End Mail Loop
print "</form><script>";
$runtime=time-$starttime;
if ($runtime>=$refresh) {
print 'document.status.submit();';
} else {
$refreshtime=int(1000*($refresh-$runtime));
print "setTimeout('document.status.submit()',$refreshtime);";
}
print "</script></body></html>";
exit 0;
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