--- loncom/lonsql 2002/05/11 21:26:53 1.42
+++ loncom/lonsql 2024/06/22 14:29:36 1.99
@@ -3,7 +3,7 @@
# The LearningOnline Network
# lonsql - LON TCP-MySQL-Server Daemon for handling database requests.
#
-# $Id: lonsql,v 1.42 2002/05/11 21:26:53 harris41 Exp $
+# $Id: lonsql,v 1.99 2024/06/22 14:29:36 raeburn Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -27,215 +27,316 @@
#
# http://www.lon-capa.org/
#
-# YEAR=2000
-# lonsql-based on the preforker:harsha jagasia:date:5/10/00
-# 7/25 Gerd Kortemeyer
-# many different dates Scott Harrison
-# YEAR=2001
-# many different dates Scott Harrison
-# 03/22/2001 Scott Harrison
-# 8/30 Gerd Kortemeyer
-# 10/17,11/28,11/29,12/20 Scott Harrison
-# YEAR=2001
-# 5/11 Scott Harrison
-#
-###
-
-###############################################################################
-## ##
-## ORGANIZATION OF THIS PERL SCRIPT ##
-## 1. Modules used ##
-## 2. Enable find subroutine ##
-## 3. Read httpd access.conf and get variables ##
-## 4. Make sure that database can be accessed ##
-## 5. Make sure this process is running from user=www ##
-## 6. Check if other instance is running ##
-## 7. POD (plain old documentation, CPAN style) ##
-## ##
-###############################################################################
+
+=pod
+
+=head1 NAME
+
+lonsql - LON TCP-MySQL-Server Daemon for handling database requests.
+
+=head1 SYNOPSIS
+
+This script should be run as user=www.
+Note that a lonsql.pid file contains the pid of the parent process.
+
+=head1 OVERVIEW
+
+=head2 Purpose within LON-CAPA
+
+LON-CAPA is meant to distribute A LOT of educational content to A LOT
+of people. It is ineffective to directly rely on contents within the
+ext2 filesystem to be speedily scanned for on-the-fly searches of
+content descriptions. (Simply put, it takes a cumbersome amount of
+time to open, read, analyze, and close thousands of files.)
+
+The solution is to index various data fields that are descriptive of
+the educational resources on a LON-CAPA server machine in a
+database. Descriptive data fields are referred to as "metadata". The
+question then arises as to how this metadata is handled in terms of
+the rest of the LON-CAPA network without burdening client and daemon
+processes.
+
+The obvious solution, using lonc to send a query to a lond process,
+doesn't work so well in general as you can see in the following
+example:
+
+ lonc= loncapa client process A-lonc= a lonc process on Server A
+ lond= loncapa daemon process
+
+ database command
+ A-lonc --------TCP/IP----------------> B-lond
+
+The problem emerges that A-lonc and B-lond are kept waiting for the
+MySQL server to "do its stuff", or in other words, perform the
+conceivably sophisticated, data-intensive, time-sucking database
+transaction. By tying up a lonc and lond process, this significantly
+cripples the capabilities of LON-CAPA servers.
+
+The solution is to offload the work onto another process, and use
+lonc and lond just for requests and notifications of completed
+processing:
+
+ database command
+
+ A-lonc ---------TCP/IP-----------------> B-lond =====> B-lonsql
+ <---------------------------------/ |
+ "ok, I'll get back to you..." |
+ |
+ /
+ A-lond <------------------------------- B-lonc <======
+ "Guess what? I have the result!"
+
+Of course, depending on success or failure, the messages may vary, but
+the principle remains the same where a separate pool of children
+processes (lonsql's) handle the MySQL database manipulations.
+
+Thus, lonc and lond spend effectively no time waiting on results from
+the database.
+
+=head1 Internals
+
+=cut
+
+use strict;
use lib '/home/httpd/lib/perl/';
+use LONCAPA;
use LONCAPA::Configuration;
+use LONCAPA::lonmetadata();
+use Apache::lonnet;
use IO::Socket;
use Symbol;
use POSIX;
use IO::Select;
-use IO::File;
-use Socket;
-use Fcntl;
-use Tie::RefHash;
use DBI;
+use File::Find;
+use localenroll;
+use GDBM_File;
-my @metalist;
-# ----------------- Code to enable 'find' subroutine listing of the .meta files
-require "find.pl";
-sub wanted {
- (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&
- -f _ &&
- /^.*\.meta$/ && !/^.+\.\d+\.[^\.]+\.meta$/ &&
- push(@metalist,"$dir/$_");
-}
-
-$childmaxattempts=10;
-$run =0;#running counter to generate the query-id
-
-# ------------------------------------------- Read access.conf and loncapa.conf
-my $perlvarref=LONCAPA::Configuration::read_conf('access.conf','loncapa.conf');
-my %perlvar=%{$perlvarref};
+########################################################
+########################################################
-# ------------------------------------- Make sure that database can be accessed
-{
- my $dbh;
- unless (
- $dbh = DBI->connect("DBI:mysql:loncapa","www",$perlvar{'lonSqlAccess'},{ RaiseError =>0,PrintError=>0})
- ) {
- print "Cannot connect to database!\n";
- $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
- $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!";
- system("echo 'Cannot connect to MySQL database!' |\
- mailto $emailto -s '$subj' > /dev/null");
- exit 1;
- }
- else {
- $dbh->disconnect;
- }
-}
+=pod
-# --------------------------------------------- Check if other instance running
+=over 4
-my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
+=item Global Variables
-if (-e $pidfile) {
- my $lfh=IO::File->new("$pidfile");
- my $pide=<$lfh>;
- chomp($pide);
- if (kill 0 => $pide) { die "already running"; }
-}
+=over 4
-# ------------------------------------------------------------- Read hosts file
-$PREFORK=4; # number of children to maintain, at least four spare
+=item dbh
-open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
+=back
-while ($configline=<CONFIG>) {
- my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
- chomp($ip);
+=cut
- $hostip{$ip}=$id;
- if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
+########################################################
+########################################################
+my $dbh;
- $PREFORK++;
-}
-close(CONFIG);
+########################################################
+########################################################
-$PREFORK=int($PREFORK/4);
+=pod
-$unixsock = "mysqlsock";
-my $localfile="$perlvar{'lonSockDir'}/$unixsock";
-my $server;
-unlink ($localfile);
-unless ($server=IO::Socket::UNIX->new(Local =>"$localfile",
- Type => SOCK_STREAM,
- Listen => 10))
-{
- print "in socket error:$@\n";
-}
+=item Variables required for forking
-# -------------------------------------------------------- Routines for forking
-# global variables
-$MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process
-%children = (); # keys are current child process IDs
-$children = 0; # current number of children
+=over 4
-sub REAPER { # takes care of dead children
- $SIG{CHLD} = \&REAPER;
- my $pid = wait;
- $children --;
- &logthis("Child $pid died");
- delete $children{$pid};
+=item $MAX_CLIENTS_PER_CHILD
+
+The number of clients each child should process.
+
+=item %children
+
+The keys to %children are the current child process IDs
+
+=item $children
+
+The current number of children
+
+=back
+
+=cut
+
+########################################################
+########################################################
+my $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should process
+my %children = (); # keys are current child process IDs
+my $children = 0; # current number of children
+
+###################################################################
+###################################################################
+
+=pod
+
+=item Main body of code.
+
+=over 4
+
+=item Read data from loncapa_apache.conf and loncapa.conf.
+
+=item Ensure we can access the database.
+
+=item Determine if there are other instances of lonsql running.
+
+=item Read the hosts file.
+
+=item Create a socket for lonsql.
+
+=item Fork once and dissociate from parent.
+
+=item Write PID to disk.
+
+=item Prefork children and maintain the population of children.
+
+=back
+
+=cut
+
+###################################################################
+###################################################################
+my $childmaxattempts=10;
+my $run =0; # running counter to generate the query-id
+#
+# Read loncapa_apache.conf and loncapa.conf
+#
+my %perlvar=%{&LONCAPA::Configuration::read_conf('loncapa.conf')};
+#
+# Write the /home/www/.my.cnf file
+my $conf_file = '/home/www/.my.cnf';
+if (! -e $conf_file) {
+ if (open MYCNF, ">$conf_file") {
+ print MYCNF <<"ENDMYCNF";
+[client]
+user=www
+password=$perlvar{'lonSqlAccess'}
+ENDMYCNF
+ close MYCNF;
+ } else {
+ warn "Unable to write $conf_file, continuing";
+ }
}
-sub HUNTSMAN { # signal handler for SIGINT
- local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
- kill 'INT' => keys %children;
- my $execdir=$perlvar{'lonDaemons'};
- unlink("$execdir/logs/lonsql.pid");
- &logthis("<font color=red>CRITICAL: Shutting down</font>");
- $unixsock = "mysqlsock";
- my $port="$perlvar{'lonSockDir'}/$unixsock";
- unlink(port);
- exit; # clean up with dignity
+
+#
+# Make sure that database can be accessed
+#
+my $dbh;
+unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
+ $perlvar{'lonSqlAccess'},
+ { RaiseError =>0,PrintError=>0})) {
+ print "Cannot connect to database!\n";
+ my $emailto="$perlvar{'lonAdmEMail'} $perlvar{'lonSysEMail'}";
+ my $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!";
+ system("echo 'Cannot connect to MySQL database!' |".
+ " mail -s '$subj' $emailto > /dev/null");
+
+ open(SMP,">$perlvar{'lonDocRoot'}/lon-status/mysql.txt");
+ print SMP 'time='.time.'&mysql=defunct'."\n";
+ close(SMP);
+
+ exit 1;
+} else {
+ unlink("$perlvar{'lonDocRoot'}/lon-status/mysql.txt");
+ $dbh->disconnect;
}
-sub HUPSMAN { # signal handler for SIGHUP
- local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
- kill 'INT' => keys %children;
- close($server); # free up socket
- &logthis("<font color=red>CRITICAL: Restarting</font>");
- my $execdir=$perlvar{'lonDaemons'};
- $unixsock = "mysqlsock";
- my $port="$perlvar{'lonSockDir'}/$unixsock";
- unlink(port);
- exec("$execdir/lonsql"); # here we go again
+#
+# Check if other instance running
+#
+my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";
+if (-e $pidfile) {
+ open(my $lfh,"$pidfile");
+ my $pide=<$lfh>;
+ chomp($pide);
+ if (kill 0 => $pide) { die "already running"; }
}
-sub logthis {
- my $message=shift;
- my $execdir=$perlvar{'lonDaemons'};
- my $fh=IO::File->new(">>$execdir/logs/lonsqlfinal.log");
- my $now=time;
- my $local=localtime($now);
- print $fh "$local ($$): $message\n";
+my $PREFORK=4; # number of children to maintain, at least four spare
+#
+#$PREFORK=int($PREFORK/4);
+
+#
+# Create a socket to talk to lond
+#
+my $unixsock = "mysqlsock";
+my $localfile="$perlvar{'lonSockDir'}/$unixsock";
+my $server;
+unlink ($localfile);
+unless ($server=IO::Socket::UNIX->new(Local =>"$localfile",
+ Type => SOCK_STREAM,
+ Listen => 10)) {
+ print "in socket error:$@\n";
}
-# ---------------------------------------------------- Fork once and dissociate
-$fpid=fork;
+
+#
+# Fork once and dissociate
+#
+my $fpid=fork;
exit if $fpid;
die "Couldn't fork: $!" unless defined ($fpid);
-
POSIX::setsid() or die "Can't start new session: $!";
-# ------------------------------------------------------- Write our PID on disk
-
-$execdir=$perlvar{'lonDaemons'};
+#
+# Write our PID on disk
+my $execdir=$perlvar{'lonDaemons'};
open (PIDSAVE,">$execdir/logs/lonsql.pid");
print PIDSAVE "$$\n";
close(PIDSAVE);
-&logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
+&logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
-# ----------------------------- Ignore signals generated during initial startup
+#
+# Ignore signals generated during initial startup
$SIG{HUP}=$SIG{USR1}='IGNORE';
-# ------------------------------------------------------- Now we are on our own
-# Fork off our children.
+# Now we are on our own
+# Fork off our children.
for (1 .. $PREFORK) {
make_new_child();
}
+#
# Install signal handlers.
$SIG{CHLD} = \&REAPER;
$SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
$SIG{HUP} = \&HUPSMAN;
+#
# And maintain the population.
while (1) {
sleep; # wait for a signal (i.e., child's death)
- for ($i = $children; $i < $PREFORK; $i++) {
+ for (my $i = $children; $i < $PREFORK; $i++) {
make_new_child(); # top up the child pool
}
}
+########################################################
+########################################################
+
+=pod
+
+=item &make_new_child
+
+Inputs: None
+
+Returns: None
+=cut
+
+########################################################
+########################################################
sub make_new_child {
my $pid;
my $sigset;
-
+ #
# block signal for fork
$sigset = POSIX::SigSet->new(SIGINT);
sigprocmask(SIG_BLOCK, $sigset)
or die "Can't block SIGINT for fork: $!\n";
-
+ #
die "fork: $!" unless defined ($pid = fork);
-
+ #
if ($pid) {
# Parent records the child's birth and returns.
sigprocmask(SIG_UNBLOCK, $sigset)
@@ -246,142 +347,164 @@ sub make_new_child {
} else {
# Child can *not* return from this subroutine.
$SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
-
# unblock signals
sigprocmask(SIG_UNBLOCK, $sigset)
or die "Can't unblock SIGINT for fork: $!\n";
-
-
#open database handle
# making dbh global to avoid garbage collector
- unless (
- $dbh = DBI->connect("DBI:mysql:loncapa","www",$perlvar{'lonSqlAccess'},{ RaiseError =>0,PrintError=>0})
- ) {
- sleep(10+int(rand(20)));
- &logthis("<font color=blue>WARNING: Couldn't connect to database ($st secs): $@</font>");
- print "database handle error\n";
- exit;
-
- };
- # make sure that a database disconnection occurs with ending kill signals
+ unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
+ $perlvar{'lonSqlAccess'},
+ { RaiseError =>0,PrintError=>0})) {
+ sleep(10+int(rand(20)));
+ &logthis("<font color='blue'>WARNING: Couldn't connect to database".
+ ": $@</font>");
+ # "($st secs): $@</font>");
+ print "database handle error\n";
+ exit;
+ }
+ # make sure that a database disconnection occurs with
+ # ending kill signals
$SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
-
# handle connections until we've reached $MAX_CLIENTS_PER_CHILD
- for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
- $client = $server->accept() or last;
-
+ for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
+ my $client = $server->accept() or last;
# do something with the connection
$run = $run+1;
my $userinput = <$client>;
chomp($userinput);
-
- my ($conserver,$querytmp,
- $customtmp,$customshowtmp)=split(/&/,$userinput);
- my $query=unescape($querytmp);
- my $custom=unescape($customtmp);
- my $customshow=unescape($customshowtmp);
-
+ $userinput=~s/\:($LONCAPA::domain_re)$//;
+ my $searchdomain=$1;
+ #
+ my ($conserver,$query,
+ $arg1,$arg2,$arg3)=split(/&/,$userinput);
+ my $query=unescape($query);
+ #
#send query id which is pid_unixdatetime_runningcounter
- $queryid = $thisserver;
+ my $queryid = &Apache::lonnet::hostname($perlvar{'lonHostID'});
$queryid .="_".($$)."_";
$queryid .= time."_";
$queryid .= $run;
print $client "$queryid\n";
-
- &logthis("QUERY: $query");
- &logthis("QUERY: $query");
- sleep 1;
- #prepare and execute the query
- my $sth = $dbh->prepare($query);
- my $result;
- my @files;
- my $subsetflag=0;
- if ($query) {
- unless ($sth->execute())
- {
- &logthis("<font color=blue>WARNING: Could not retrieve from database: $@</font>");
- $result="";
- }
- else {
- my $r1=$sth->fetchall_arrayref;
- my @r2;
- foreach (@$r1) {my $a=$_;
- my @b=map {escape($_)} @$a;
- push @files,@{$a}[3];
- push @r2,join(",", @b)
- }
- $result=join("&",@r2);
- }
- }
- # do custom metadata searching here and build into result
- if ($custom or $customshow) {
- &logthis("am going to do custom query for $custom");
- if ($query) {
- @metalist=map {$perlvar{'lonDocRoot'}.$_.'.meta'} @files;
- }
- else {
- @metalist=(); pop @metalist;
- opendir(RESOURCES,"$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}");
- my @homeusers=grep
- {&ishome("$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}/$_")}
- grep {!/^\.\.?$/} readdir(RESOURCES);
- closedir RESOURCES;
- foreach my $user (@homeusers) {
- &find("$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}/$user");
- }
- }
-# &logthis("FILELIST:" . join(":::",@metalist));
- # if file is indicated in sql database and
- # not part of sql-relevant query, do not pattern match.
- # if file is not in sql database, output error.
- # if file is indicated in sql database and is
- # part of query result list, then do the pattern match.
- my $customresult='';
- my @r2;
- foreach my $m (@metalist) {
- my $fh=IO::File->new($m);
- my @lines=<$fh>;
- my $stuff=join('',@lines);
- if ($stuff=~/$custom/s) {
- foreach my $f ('abstract','author','copyright',
- 'creationdate','keywords','language',
- 'lastrevisiondate','mime','notes',
- 'owner','subject','title') {
- $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s;
- }
- my $m2=$m; my $docroot=$perlvar{'lonDocRoot'};
- $m2=~s/^$docroot//;
- $m2=~s/\.meta$//;
- unless ($query) {
- my $q2="select * from metadata where url like binary '$m2'";
- my $sth = $dbh->prepare($q2);
- $sth->execute();
- my $r1=$sth->fetchall_arrayref;
- foreach (@$r1) {my $a=$_;
- my @b=map {escape($_)} @$a;
- push @files,@{$a}[3];
- push @r2,join(",", @b)
- }
- }
-# &logthis("found: $stuff");
- $customresult.='&custom='.escape($m2).','.escape($stuff);
+ #
+ # &logthis("QUERY: $query - $arg1 - $arg2 - $arg3 - $queryid");
+ # sleep 1;
+ #
+ my $result='';
+ #
+ # At this point, query is received, query-ID assigned and sent
+ # back, $query eq 'logquery' will mean that this is a query
+ # against log-files
+ if (($query eq 'userlog') || ($query eq 'courselog')) {
+ # beginning of log query
+ my $udom = &unescape($arg1);
+ my $uname = &unescape($arg2);
+ my $command = &unescape($arg3);
+ my $path = &propath($udom,$uname);
+ if (-e "$path/activity.log") {
+ if ($query eq 'userlog') {
+ $result=&userlog($path,$command);
+ } else {
+ $result=&courselog($path,$command);
+ }
+ $result = &escape($result);
+ } else {
+ &logthis('Unable to do log query: '.$uname.'@'.$udom);
+ $result='no_such_file';
+ }
+ # end of log query
+ } elsif (($query eq 'fetchenrollment') ||
+ ($query eq 'institutionalphotos')) {
+ # retrieve institutional class lists
+ my $dom = &unescape($arg1);
+ my %affiliates = ();
+ my %replies = ();
+ my $locresult = '';
+ my $querystr = &unescape($arg3);
+ foreach (split/%%/,$querystr) {
+ if (/^([^=]+)=([^=]+)$/) {
+ @{$affiliates{$1}} = split/,/,$2;
+ }
+ }
+ if ($query eq 'fetchenrollment') {
+ $locresult = &localenroll::fetch_enrollment($dom,\%affiliates,\%replies);
+ } elsif ($query eq 'institutionalphotos') {
+ my $crs = &unescape($arg2);
+ eval {
+ local($SIG{__DIE__})='DEFAULT';
+ $locresult = &localenroll::institutional_photos($dom,$crs,\%affiliates,\%replies,'update');
+ };
+ if ($@) {
+ $locresult = 'error';
}
- }
- $result=join("&",@r2) unless $query;
- $result.=$customresult;
- }
- # reply with result
- $result.="\n" if $result;
- &reply("queryreply:$queryid:$result",$conserver);
-
+ }
+ $result = &escape($locresult.':');
+ if ($locresult) {
+ $result .= &escape(join(':',map{$_.'='.$replies{$_}} keys %replies));
+ }
+ } elsif ($query eq 'usersearch') {
+ my ($srchby,$srchtype,$srchterm);
+ if ((&unescape($arg1) eq $searchdomain) &&
+ ($arg2 =~ /\%\%/)) {
+ ($srchby,$srchtype) =
+ map {&unescape($_);} (split(/\%\%/,$arg2));
+ $srchterm = &unescape($arg3);
+ } else {
+ ($srchby,$srchtype,$srchterm) =
+ map {&unescape($_);} ($arg1,$arg2,$arg3);
+ }
+ $result = &do_user_search($searchdomain,$srchby,
+ $srchtype,$srchterm);
+ } elsif ($query eq 'instdirsearch') {
+ $result = &do_inst_dir_search($searchdomain,$arg1,$arg2,$arg3);
+ } elsif ($query eq 'getinstuser') {
+ $result = &get_inst_user($searchdomain,$arg1,$arg2);
+ } elsif ($query eq 'getmultinstusers') {
+ $result = &get_multiple_instusers($searchdomain,$arg3);
+ } elsif ($query eq 'prepare activity log') {
+ my ($cid,$domain) = map {&unescape($_);} ($arg1,$arg2);
+ &logthis('preparing activity log tables for '.$cid);
+ my $command =
+ qq{$perlvar{'lonDaemons'}/parse_activity_log.pl -course=$cid -domain=$domain};
+ system($command);
+ &logthis($command);
+ my $returnvalue = $?>>8;
+ if ($returnvalue) {
+ $result = 'error: parse_activity_log.pl returned '.
+ $returnvalue;
+ } else {
+ $result = 'success';
+ }
+ } elsif (($query eq 'portfolio_metadata') ||
+ ($query eq 'portfolio_access')) {
+ $result = &portfolio_table_update($query,$arg1,$arg2,
+ $arg3);
+ } elsif ($query eq 'allusers') {
+ my ($uname,$udom) = map {&unescape($_);} ($arg1,$arg2);
+ my %userdata;
+ my (@data) = split(/\%\%/,$arg3);
+ foreach my $item (@data) {
+ my ($key,$value) = split(/=/,$item);
+ $userdata{$key} = &unescape($value);
+ }
+ $userdata{'username'} = $uname;
+ $userdata{'domain'} = $udom;
+ $result = &allusers_table_update($query,$uname,$udom,\%userdata);
+ } else {
+ # Sanity checking of $query needed.
+ # Do an sql query
+ $result = &do_sql_query($query,$arg1,$arg2,$arg3,$searchdomain);
+ }
+ # result does not need to be escaped because it has already been
+ # escaped.
+ #$result=&escape($result);
+ &Apache::lonnet::reply("queryreply:$queryid:$result",$conserver);
}
-
# tidy up gracefully and finish
-
- #close the database handle
+ #
+ # close the database handle
$dbh->disconnect
- or &logthis("<font color=blue>WARNING: Couldn't disconnect from database $DBI::errstr ($st secs): $@</font>");
-
+ or &logthis("<font color='blue'>WARNING: Couldn't disconnect".
+ " from database $DBI::errstr : $@</font>");
# this exit is VERY important, otherwise the child will become
# a producer of more and more children, forking yourself into
# process death.
@@ -389,62 +512,534 @@ sub make_new_child {
}
}
-sub DISCONNECT {
- $dbh->disconnect or
- &logthis("<font color=blue>WARNING: Couldn't disconnect from database $DBI::errstr ($st secs): $@</font>");
- exit;
+sub do_user_search {
+ my ($domain,$srchby,$srchtype,$srchterm) = @_;
+ my $result;
+ my $quoted_dom = $dbh->quote( $domain );
+ my ($query,$quoted_srchterm,@fields);
+ my ($table_columns,$table_indices) =
+ &LONCAPA::lonmetadata::describe_metadata_storage('allusers');
+ foreach my $coldata (@{$table_columns}) {
+ push(@fields,$coldata->{'name'});
+ }
+ my $fieldlist = join(',',@fields);
+ $query = "SELECT $fieldlist FROM allusers WHERE (domain = $quoted_dom AND ";
+ if ($srchby eq 'lastfirst') {
+ my ($fraglast,$fragfirst) = split(/,/,$srchterm);
+ $fragfirst =~ s/^\s+//;
+ $fraglast =~ s/\s+$//;
+ if ($srchtype eq 'exact') {
+ $query .= 'lastname = '.$dbh->quote($fraglast).
+ ' AND firstname = '.$dbh->quote($fragfirst);
+ } elsif ($srchtype eq 'begins') {
+ $query .= 'lastname LIKE '.$dbh->quote($fraglast.'%').
+ ' AND firstname LIKE '.$dbh->quote($fragfirst.'%');
+ } else {
+ $query .= 'lastname LIKE '.$dbh->quote('%'.$fraglast.'%').
+ ' AND firstname LIKE '.$dbh->quote('%'.$fragfirst.'%');
+ }
+ } else {
+ my %srchfield = (
+ uname_ci => 'username collate latin1_general_ci',
+ uname => 'username',
+ lastname => 'lastname',
+ email => 'permanentemail',
+ );
+ if (exists($srchfield{$srchby})) {
+ if ($srchtype eq 'exact') {
+ $query .= $srchfield{$srchby}.' = '.$dbh->quote($srchterm);
+ } elsif ($srchtype eq 'begins') {
+ $query .= $srchfield{$srchby}.' LIKE '.$dbh->quote($srchterm.'%');
+ } else {
+ $query .= $srchfield{$srchby}.' LIKE '.$dbh->quote('%'.$srchterm.'%');
+ }
+ } else {
+ &logthis('<font color="blue">'.
+ 'WARNING: Invalid srchby: '.$srchby.'</font>');
+ return $result;
+ }
+ }
+ $query .= ") ORDER BY username ";
+ my $sth = $dbh->prepare($query);
+ if ($sth->execute()) {
+ my @results;
+ while (my @row = $sth->fetchrow_array) {
+ my @items;
+ for (my $i=0; $i<@row; $i++) {
+ push(@items,&escape($fields[$i]).'='.&escape($row[$i]));
+ }
+ my $userstr = join(':', @items);
+ push(@results,&escape($userstr));
+ }
+ $sth->finish;
+ $result = join('&',@results);
+ } else {
+ &logthis('<font color="blue">'.
+ 'WARNING: Could not retrieve from database:'.
+ $sth->errstr().'</font>');
+ }
+ return $result;
}
-# -------------------------------------------------- Non-critical communication
+sub do_inst_dir_search {
+ my ($domain,$srchby,$srchterm,$srchtype) = @_;
+ $srchby = &unescape($srchby);
+ $srchterm = &unescape($srchterm);
+ $srchtype = &unescape($srchtype);
+ my (%instusers,%instids,$result,$response);
+ eval {
+ local($SIG{__DIE__})='DEFAULT';
+ $result=&localenroll::get_userinfo($domain,undef,undef,\%instusers,
+ \%instids,undef,$srchby,$srchterm,
+ $srchtype);
+ };
+ if ($result eq 'ok') {
+ if (%instusers) {
+ foreach my $key (keys(%instusers)) {
+ my $usrstr = &Apache::lonnet::freeze_escape($instusers{$key});
+ $response .=&escape(&escape($key).'='.$usrstr).'&';
+ }
+ }
+ $response=~s/\&$//;
+ } else {
+ $response = 'unavailable';
+ }
+ return $response;
+}
-sub subreply {
- my ($cmd,$server)=@_;
- my $peerfile="$perlvar{'lonSockDir'}/$server";
- my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
- Type => SOCK_STREAM,
- Timeout => 10)
- or return "con_lost";
- print $sclient "$cmd\n";
- my $answer=<$sclient>;
- chomp($answer);
- if (!$answer) { $answer="con_lost"; }
- return $answer;
+sub get_inst_user {
+ my ($domain,$uname,$id) = @_;
+ $uname = &unescape($uname);
+ $id = &unescape($id);
+ my (%instusers,%instids,$result,$response);
+ eval {
+ local($SIG{__DIE__})='DEFAULT';
+ $result=&localenroll::get_userinfo($domain,$uname,$id,\%instusers,
+ \%instids);
+ };
+ if ($result eq 'ok') {
+ if (keys(%instusers) > 0) {
+ foreach my $key (keys(%instusers)) {
+ my $usrstr = &Apache::lonnet::freeze_escape($instusers{$key});
+ $response .= &escape(&escape($key).'='.$usrstr).'&';
+ }
+ }
+ $response=~s/\&$//;
+ } else {
+ $response = 'unavailable';
+ }
+ return $response;
}
-sub reply {
- my ($cmd,$server)=@_;
- my $answer;
- if ($server ne $perlvar{'lonHostID'}) {
- $answer=subreply($cmd,$server);
- if ($answer eq 'con_lost') {
- $answer=subreply("ping",$server);
- $answer=subreply($cmd,$server);
+sub get_multiple_instusers {
+ my ($domain,$data) = @_;
+ my ($type,$users) = split(/=/,$data,2);
+ my $requested = &Apache::lonnet::thaw_unescape($users);
+ my $response;
+ if (ref($requested) eq 'HASH') {
+ my (%instusers,%instids,$result);
+ eval {
+ local($SIG{__DIE__})='DEFAULT';
+ $result=&localenroll::get_multusersinfo($domain,$type,$requested,\%instusers,
+ \%instids);
+ };
+ if ($@) {
+ $response = 'error';
+ } elsif ($result eq 'ok') {
+ $response = $result;
+ if (keys(%instusers)) {
+ $response .= '='.&Apache::lonnet::freeze_escape(\%instusers);
+ }
+ } elsif ($result eq 'unavailable') {
+ $response = $result;
+ }
+ } else {
+ $response = 'invalid';
}
- } else {
- $answer='self_reply';
- $answer=subreply($cmd,$server);
- }
- return $answer;
+ return $response;
}
-# -------------------------------------------------------- Escape Special Chars
+########################################################
+########################################################
+
+=pod
+
+=item &do_sql_query
+
+Runs an sql metadata table query.
-sub escape {
- my $str=shift;
- $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
- return $str;
+Inputs: $query, $custom, $customshow
+
+Returns: A string containing escaped results.
+
+=cut
+
+########################################################
+########################################################
+{
+ my @metalist;
+
+sub process_file {
+ if ( -e $_ && # file exists
+ -f $_ && # and is a normal file
+ /\.meta$/ && # ends in meta
+ ! /^.+\.\d+\.[^\.]+\.meta$/ # is not a previous version
+ ) {
+ push(@metalist,$File::Find::name);
+ }
}
-# ----------------------------------------------------- Un-Escape Special Chars
+sub do_sql_query {
+ my ($query,$custom,$customshow,$domainstr,$searchdomain) = @_;
+
+#
+# limit to searchdomain if given and table is metadata
+#
+ if ($domainstr && ($query=~/FROM metadata/)) {
+ my $havingstr;
+ $domainstr = &unescape($domainstr);
+ if ($domainstr =~ /,/) {
+ foreach my $dom (split(/,/,$domainstr)) {
+ if ($dom =~ /^$LONCAPA::domain_re$/) {
+ $havingstr .= 'domain="'.$dom.'" OR ';
+ }
+ }
+ $havingstr =~ s/ OR $//;
+ } else {
+ if ($domainstr =~ /^$LONCAPA::domain_re$/) {
+ $havingstr = 'domain="'.$domainstr.'"';
+ }
+ }
+ if ($havingstr) {
+ $query.=' HAVING ('.$havingstr.')';
+ }
+ } elsif (($searchdomain) && ($query=~/FROM metadata/)) {
+ $query.=' HAVING (domain="'.$searchdomain.'")';
+ }
+# &logthis('doing query ('.$searchdomain.')'.$query);
+
-sub unescape {
- my $str=shift;
- $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
- return $str;
+
+ $custom = &unescape($custom);
+ $customshow = &unescape($customshow);
+ #
+ @metalist = ();
+ #
+ my $result = '';
+ my @results = ();
+ my @files;
+ my $subsetflag=0;
+ #
+ if ($query) {
+ #prepare and execute the query
+ my $sth = $dbh->prepare($query);
+ unless ($sth->execute()) {
+ &logthis('<font color="blue">'.
+ 'WARNING: Could not retrieve from database:'.
+ $sth->errstr().'</font>');
+ } else {
+ my $aref=$sth->fetchall_arrayref;
+ foreach my $row (@$aref) {
+ push @files,@{$row}[3] if ($custom or $customshow);
+ my @b=map { &escape($_); } @$row;
+ push @results,join(",", @b);
+ # Build up the @files array with the LON-CAPA urls
+ # of the resources.
+ }
+ }
+ }
+ # do custom metadata searching here and build into result
+ return join("&",@results) if (! ($custom or $customshow));
+ # Only get here if there is a custom query or custom show request
+ &logthis("Doing custom query for $custom");
+ if ($query) {
+ @metalist=map {
+ $perlvar{'lonDocRoot'}.$_.'.meta';
+ } @files;
+ } else {
+ my $dir = "$perlvar{'lonDocRoot'}/res/$perlvar{'lonDefDomain'}";
+ @metalist=();
+ opendir(RESOURCES,$dir);
+ my @homeusers=grep {
+ &ishome($dir.'/'.$_);
+ } grep {!/^\.\.?$/} readdir(RESOURCES);
+ closedir RESOURCES;
+ # Define the
+ foreach my $user (@homeusers) {
+ find (\&process_file,$dir.'/'.$user);
+ }
+ }
+ # if file is indicated in sql database and
+ # not part of sql-relevant query, do not pattern match.
+ #
+ # if file is not in sql database, output error.
+ #
+ # if file is indicated in sql database and is
+ # part of query result list, then do the pattern match.
+ my $customresult='';
+ my @results;
+ foreach my $metafile (@metalist) {
+ open(my $fh,$metafile);
+ my @lines=<$fh>;
+ my $stuff=join('',@lines);
+ if ($stuff=~/$custom/s) {
+ foreach my $f ('abstract','author','copyright',
+ 'creationdate','keywords','language',
+ 'lastrevisiondate','mime','notes',
+ 'owner','subject','title') {
+ $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s;
+ }
+ my $mfile=$metafile;
+ my $docroot=$perlvar{'lonDocRoot'};
+ $mfile=~s/^$docroot//;
+ $mfile=~s/\.meta$//;
+ unless ($query) {
+ my $q2="SELECT * FROM metadata WHERE url ".
+ " LIKE BINARY '?'";
+ my $sth = $dbh->prepare($q2);
+ $sth->execute($mfile);
+ my $aref=$sth->fetchall_arrayref;
+ foreach my $a (@$aref) {
+ my @b=map { &escape($_)} @$a;
+ push @results,join(",", @b);
+ }
+ }
+ # &logthis("found: $stuff");
+ $customresult.='&custom='.&escape($mfile).','.
+ escape($stuff);
+ }
+ }
+ $result=join("&",@results) unless $query;
+ $result.=$customresult;
+ #
+ return $result;
+} # End of &do_sql_query
+
+} # End of scoping curly braces for &process_file and &do_sql_query
+
+sub portfolio_table_update {
+ my ($query,$arg1,$arg2,$arg3) = @_;
+ my %tablenames = (
+ 'portfolio' => 'portfolio_metadata',
+ 'access' => 'portfolio_access',
+ 'addedfields' => 'portfolio_addedfields',
+ );
+ my $result = 'ok';
+ my $tablechk = &check_table($query);
+ if ($tablechk == 0) {
+ my $request =
+ &LONCAPA::lonmetadata::create_metadata_storage($query,$query);
+ $dbh->do($request);
+ if ($dbh->err) {
+ &logthis("create $query".
+ " ERROR: ".$dbh->errstr);
+ $result = 'error';
+ }
+ }
+ if ($result eq 'ok') {
+ my ($uname,$udom,$group) = split(/:/,&unescape($arg1));
+ my $file_name = &unescape($arg2);
+ my $action = $arg3;
+ my $is_course = 0;
+ if ($group ne '') {
+ $is_course = 1;
+ }
+ my $urlstart = '/uploaded/'.$udom.'/'.$uname;
+ my $pathstart = &propath($udom,$uname).'/userfiles';
+ my ($fullpath,$url);
+ if ($is_course) {
+ $fullpath = $pathstart.'/groups/'.$group.'/portfolio'.
+ $file_name;
+ $url = $urlstart.'/groups/'.$group.'/portfolio'.$file_name;
+ } else {
+ $fullpath = $pathstart.'/portfolio'.$file_name;
+ $url = $urlstart.'/portfolio'.$file_name;
+ }
+ if ($query eq 'portfolio_metadata') {
+ if ($action eq 'delete') {
+ my %loghash = &LONCAPA::lonmetadata::process_portfolio_metadata($dbh,undef,\%tablenames,$url,$fullpath,$is_course,$udom,$uname,$group,'update');
+ } elsif (-e $fullpath.'.meta') {
+ my %loghash = &LONCAPA::lonmetadata::process_portfolio_metadata($dbh,undef,\%tablenames,$url,$fullpath,$is_course,$udom,$uname,$group,'update');
+ if (keys(%loghash) > 0) {
+ &portfolio_logging(%loghash);
+ }
+ }
+ } elsif ($query eq 'portfolio_access') {
+ my %access = &get_access_hash($uname,$udom,$group.$file_name);
+ my %loghash =
+ &LONCAPA::lonmetadata::process_portfolio_access_data($dbh,undef,
+ \%tablenames,$url,$fullpath,\%access,'update');
+ if (keys(%loghash) > 0) {
+ &portfolio_logging(%loghash);
+ } else {
+ my $available = 0;
+ foreach my $key (keys(%access)) {
+ my ($num,$scope,$end,$start) =
+ ($key =~ /^([^:]+):([a-z]+)_(\d*)_?(\d*)$/);
+ if ($scope eq 'public' || $scope eq 'guest') {
+ $available = 1;
+ last;
+ }
+ }
+ if ($available) {
+ # Retrieve current values
+ my $condition = 'url='.$dbh->quote("$url");
+ my ($error,$row) =
+ &LONCAPA::lonmetadata::lookup_metadata($dbh,$condition,undef,
+ 'portfolio_metadata');
+ if (!$error) {
+ if (!(ref($row->[0]) eq 'ARRAY')) {
+ my %loghash =
+ &LONCAPA::lonmetadata::process_portfolio_metadata($dbh,undef,
+ \%tablenames,$url,$fullpath,$is_course,$udom,$uname,$group);
+ if (keys(%loghash) > 0) {
+ &portfolio_logging(%loghash);
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ return $result;
}
-# --------------------------------------- Is this the home server of an author?
-# (copied from lond, modification of the return value)
+sub get_access_hash {
+ my ($uname,$udom,$file) = @_;
+ my $hashref = &tie_user_hash($udom,$uname,'file_permissions',
+ &GDBM_READER());
+ my %curr_perms;
+ my %access;
+ if ($hashref) {
+ while (my ($key,$value) = each(%$hashref)) {
+ $key = &unescape($key);
+ next if ($key =~ /^error: 2 /);
+ $curr_perms{$key}=&Apache::lonnet::thaw_unescape($value);
+ }
+ if (!&untie_user_hash($hashref)) {
+ &logthis("error: ".($!+0)." untie (GDBM) Failed");
+ }
+ } else {
+ &logthis("error: ".($!+0)." tie (GDBM) Failed");
+ }
+ if (keys(%curr_perms) > 0) {
+ if (ref($curr_perms{$file."\0".'accesscontrol'}) eq 'HASH') {
+ foreach my $acl (keys(%{$curr_perms{$file."\0".'accesscontrol'}})) {
+ $access{$acl} = $curr_perms{$file."\0".$acl};
+ }
+ }
+ }
+ return %access;
+}
+
+sub allusers_table_update {
+ my ($query,$uname,$udom,$userdata) = @_;
+ my %tablenames = (
+ 'allusers' => 'allusers',
+ );
+ my $result = 'ok';
+ my $tablechk = &check_table($query);
+ if ($tablechk == 0) {
+ my $request =
+ &LONCAPA::lonmetadata::create_metadata_storage($query,$query);
+ $dbh->do($request);
+ if ($dbh->err) {
+ &logthis("create $query".
+ " ERROR: ".$dbh->errstr);
+ $result = 'error';
+ }
+ }
+ if ($result eq 'ok') {
+ my %loghash =
+ &LONCAPA::lonmetadata::process_allusers_data($dbh,undef,
+ \%tablenames,$uname,$udom,$userdata,'update');
+ foreach my $key (keys(%loghash)) {
+ &logthis($loghash{$key});
+ }
+ }
+ return $result;
+}
+
+###########################################
+sub check_table {
+ my ($table_id) = @_;
+ my $sth=$dbh->prepare('SHOW TABLES');
+ $sth->execute();
+ my $aref = $sth->fetchall_arrayref;
+ $sth->finish();
+ if ($sth->err()) {
+ &logthis("fetchall_arrayref after SHOW TABLES".
+ " ERROR: ".$sth->errstr);
+ return undef;
+ }
+ my $result = 0;
+ foreach my $table (@{$aref}) {
+ if ($table->[0] eq $table_id) {
+ $result = 1;
+ last;
+ }
+ }
+ return $result;
+}
+
+###########################################
+
+sub portfolio_logging {
+ my (%portlog) = @_;
+ foreach my $key (keys(%portlog)) {
+ if (ref($portlog{$key}) eq 'HASH') {
+ foreach my $item (keys(%{$portlog{$key}})) {
+ &logthis($portlog{$key}{$item});
+ }
+ }
+ }
+}
+
+
+########################################################
+########################################################
+
+=pod
+
+=item &logthis
+
+Inputs: $message, the message to log
+
+Returns: nothing
+
+Writes $message to the logfile.
+
+=cut
+
+########################################################
+########################################################
+sub logthis {
+ my $message=shift;
+ my $execdir=$perlvar{'lonDaemons'};
+ open(my $fh,">>$execdir/logs/lonsql.log");
+ my $now=time;
+ my $local=localtime($now);
+ print $fh "$local ($$): $message\n";
+}
+
+########################################################
+########################################################
+
+=pod
+
+=item &ishome
+
+Determine if the current machine is the home server for a user.
+The determination is made by checking the filesystem for the users information.
+
+Inputs: $author
+
+Returns: 0 - this is not the authors home server, 1 - this is.
+
+=cut
+
+########################################################
+########################################################
sub ishome {
my $author=shift;
$author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
@@ -457,86 +1052,196 @@ sub ishome {
}
}
-# -------------------------------------------- Return path to profile directory
-# (copied from lond)
-sub propath {
- my ($udom,$uname)=@_;
- $udom=~s/\W//g;
- $uname=~s/\W//g;
- my $subdir=$uname.'__';
- $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
- my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
- return $proname;
-}
+########################################################
+########################################################
-# ----------------------------------- POD (plain old documentation, CPAN style)
+=pod
-=head1 NAME
+=item &courselog
-lonsql - LON TCP-MySQL-Server Daemon for handling database requests.
+Inputs: $path, $command
-=head1 SYNOPSIS
+Returns: unescaped string of values.
+
+=cut
+
+########################################################
+########################################################
+sub courselog {
+ my ($path,$command)=@_;
+ my %filters=();
+ foreach (split(/\:/,&unescape($command))) {
+ my ($name,$value)=split(/\=/,$_);
+ $filters{$name}=$value;
+ }
+ my @results=();
+ open(IN,$path.'/activity.log') or return ('file_error');
+ while (my $line=<IN>) {
+ chomp($line);
+ my ($timestamp,$host,$log)=split(/\:/,$line);
+#
+# $log has the actual log entries; currently still escaped, and
+# %26(timestamp)%3a(url)%3a(user)%3a(domain)
+# then additionally
+# %3aPOST%3a(name)%3d(value)%3a(name)%3d(value)
+# or
+# %3aCSTORE%3a(name)%3d(value)%26(name)%3d(value)
+#
+# get delimiter between timestamped entries to be &&&
+ $log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g;
+# now go over all log entries
+ foreach (split(/\&\&\&/,&unescape($log))) {
+ my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_);
+ my $values=&unescape(join(':',@values));
+ $values=~s/\&/\:/g;
+ $res=&unescape($res);
+ my $include=1;
+ if (($filters{'username'}) && ($uname ne $filters{'username'}))
+ { $include=0; }
+ if (($filters{'domain'}) && ($udom ne $filters{'domain'}))
+ { $include=0; }
+ if (($filters{'url'}) && ($res!~/$filters{'url'}/))
+ { $include=0; }
+ if (($filters{'start'}) && ($time<$filters{'start'}))
+ { $include=0; }
+ if (($filters{'end'}) && ($time>$filters{'end'}))
+ { $include=0; }
+ if (($filters{'action'} eq 'view') && ($action))
+ { $include=0; }
+ if (($filters{'action'} eq 'submit') && ($action ne 'POST'))
+ { $include=0; }
+ if (($filters{'action'} eq 'grade') && ($action ne 'CSTORE'))
+ { $include=0; }
+ if ($include) {
+ push(@results,($time<1000000000?'0':'').$time.':'.$res.':'.
+ $uname.':'.$udom.':'.
+ $action.':'.$values);
+ }
+ }
+ }
+ close IN;
+ return join('&',sort(@results));
+}
+
+########################################################
+########################################################
+
+=pod
+
+=item &userlog
+
+Inputs: $path, $command
+
+Returns: unescaped string of values.
+
+=cut
+
+########################################################
+########################################################
+sub userlog {
+ my ($path,$command)=@_;
+ my %filters=();
+ foreach (split(/\:/,&unescape($command))) {
+ my ($name,$value)=split(/\=/,$_);
+ $filters{$name}=$value;
+ }
+ my @results=();
+ open(IN,$path.'/activity.log') or return ('file_error');
+ while (my $line=<IN>) {
+ chomp($line);
+ my ($timestamp,$host,$log)=split(/\:/,$line);
+ $log=&unescape($log);
+ my $include=1;
+ if (($filters{'start'}) && ($timestamp<$filters{'start'}))
+ { $include=0; }
+ if (($filters{'end'}) && ($timestamp>$filters{'end'}))
+ { $include=0; }
+ if (($filters{'action'} eq 'Role') && ($log !~/^Role/))
+ { $include=0; }
+ if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; }
+ if (($filters{'action'} eq 'check') && ($log!~/^Check/))
+ { $include=0; }
+ if ($include) {
+ push(@results,$timestamp.':'.$host.':'.&escape($log));
+ }
+ }
+ close IN;
+ return join('&',sort(@results));
+}
+
+########################################################
+########################################################
+
+=pod
+
+=item Functions required for forking
+
+=over 4
+
+=item REAPER
+
+REAPER takes care of dead children.
+
+=item HUNTSMAN
+
+Signal handler for SIGINT.
-This script should be run as user=www. The following is an example invocation
-from the loncron script. Note that a lonsql.pid file contains the pid of
-the parent process.
-
- if (-e $lonsqlfile) {
- my $lfh=IO::File->new("$lonsqlfile");
- my $lonsqlpid=<$lfh>;
- chomp($lonsqlpid);
- if (kill 0 => $lonsqlpid) {
- print $fh "<h3>lonsql at pid $lonsqlpid responding</h3>";
- $restartflag=0;
- } else {
- $errors++; $errors++;
- print $fh "<h3>lonsql at pid $lonsqlpid not responding</h3>";
- $restartflag=1;
- print $fh
- "<h3>Decided to clean up stale .pid file and restart lonsql</h3>";
- }
- }
- if ($restartflag==1) {
- $errors++;
- print $fh '<br><font color="red">Killall lonsql: '.
- system('killall lonsql').' - ';
- sleep 60;
- print $fh unlink($lonsqlfile).' - '.
- system('killall -9 lonsql').
- '</font><br>';
- print $fh "<h3>lonsql not running, trying to start</h3>";
- system(
- "$perlvar{'lonDaemons'}/lonsql 2>>$perlvar{'lonDaemons'}/logs/lonsql_errors");
- sleep 10;
-
-=head1 DESCRIPTION
-
-Not yet written.
-
-=head1 README
-
-Not yet written.
-
-=head1 PREREQUISITES
-
-IO::Socket
-Symbol
-POSIX
-IO::Select
-IO::File
-Socket
-Fcntl
-Tie::RefHash
-DBI
-
-=head1 COREQUISITES
+=item HUPSMAN
-=head1 OSNAMES
+Signal handler for SIGHUP
+
+=item DISCONNECT
+
+Disconnects from database.
+
+=back
+
+=cut
+
+########################################################
+########################################################
+sub REAPER { # takes care of dead children
+ $SIG{CHLD} = \&REAPER;
+ my $pid = wait;
+ $children --;
+ &logthis("Child $pid died");
+ delete $children{$pid};
+}
+
+sub HUNTSMAN { # signal handler for SIGINT
+ local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
+ kill 'INT' => keys %children;
+ my $execdir=$perlvar{'lonDaemons'};
+ unlink("$execdir/logs/lonsql.pid");
+ &logthis("<font color='red'>CRITICAL: Shutting down</font>");
+ $unixsock = "mysqlsock";
+ my $port="$perlvar{'lonSockDir'}/$unixsock";
+ unlink($port);
+ exit; # clean up with dignity
+}
+
+sub HUPSMAN { # signal handler for SIGHUP
+ local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
+ kill 'INT' => keys %children;
+ close($server); # free up socket
+ &logthis("<font color='red'>CRITICAL: Restarting</font>");
+ my $execdir=$perlvar{'lonDaemons'};
+ $unixsock = "mysqlsock";
+ my $port="$perlvar{'lonSockDir'}/$unixsock";
+ unlink($port);
+ exec("$execdir/lonsql"); # here we go again
+}
+
+sub DISCONNECT {
+ $dbh->disconnect or
+ &logthis("<font color='blue'>WARNING: Couldn't disconnect from database ".
+ " $DBI::errstr : $@</font>");
+ exit;
+}
-linux
-=head1 SCRIPT CATEGORIES
+=pod
-Server/Process
+=back
=cut