--- loncom/lonsql 2000/05/08 15:14:27 1.1 +++ loncom/lonsql 2006/02/10 09:50:50 1.71.2.1 @@ -1,113 +1,639 @@ #!/usr/bin/perl # The LearningOnline Network -# lonsql -# provides unix domain sockets to receive queries from lond and send replies to lonc +# lonsql - LON TCP-MySQL-Server Daemon for handling database requests. +# +# $Id: lonsql,v 1.71.2.1 2006/02/10 09:50:50 albertel Exp $ +# +# Copyright Michigan State University Board of Trustees +# +# This file is part of the LearningOnline Network with CAPA (LON-CAPA). +# +# LON-CAPA is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# LON-CAPA is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with LON-CAPA; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# +# /home/httpd/html/adm/gpl.txt +# +# http://www.lon-capa.org/ # -# PID in subdir logs/lonc.pid -# kill kills -# HUP restarts -# USR1 tries to open connections again - -# 6/4/99,6/5,6/7,6/8,6/9,6/10,6/11,6/12,7/14,7/19, -# 10/8,10/9,10/15,11/18,12/22, -# 2/8 Gerd Kortemeyer -# based on nonforker from Perl Cookbook -# - server who multiplexes without forking -use POSIX; +=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 + +=over 4 + +=cut + +use strict; + +use lib '/home/httpd/lib/perl/'; +use LONCAPA::Configuration; +use LONCAPA::lonmetadata(); + use IO::Socket; +use Symbol; +use POSIX; use IO::Select; use IO::File; use Socket; use Fcntl; use Tie::RefHash; -use Crypt::IDEA; use DBI; +use File::Find; +use localenroll; + +######################################################## +######################################################## + +=pod + +=item Global Variables + +=over 4 + +=item dbh + +=back + +=cut +######################################################## +######################################################## +my $dbh; -$childmaxattempts=10; -$run =0; -# ------------------------------------ Read httpd access.conf and get variables - -open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf"; - -while ($configline=) { - if ($configline =~ /PerlSetVar/) { - my ($dummy,$varname,$varvalue)=split(/\s+/,$configline); - chomp($varvalue); - $perlvar{$varname}=$varvalue; +######################################################## +######################################################## + +=pod + +=item Variables required for forking + +=over 4 + +=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 $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf'); +my %perlvar=%{$perlvarref}; +# +# 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 $conf_file, continuing"; } } -close(CONFIG); -# ------------------------------------------------------------- Read hosts file -#$PREFORK=4; # number of children to maintain, at least four spare +# +# 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!' |". + " mailto $emailto -s '$subj' > /dev/null"); + + open(SMP,'>/home/httpd/html/lon-status/mysql.txt'); + print SMP 'time='.time.'&mysql=defunct'."\n"; + close(SMP); + + exit 1; +} else { + unlink('/home/httpd/html/lon-status/mysql.txt'); + $dbh->disconnect; +} + +# +# Check if other instance running +# +my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid"; +if (-e $pidfile) { + my $lfh=IO::File->new("$pidfile"); + my $pide=<$lfh>; + chomp($pide); + if (kill 0 => $pide) { die "already running"; } +} + +# +# Read hosts file +# +my $thisserver; +my $PREFORK=4; # number of children to maintain, at least four spare open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file"; +while (my $configline=) { + my ($id,$domain,$role,$name)=split(/:/,$configline); + $name=~s/\s//g; + $thisserver=$name if ($id eq $perlvar{'lonHostID'}); + #$PREFORK++; +} +close(CONFIG); +# +#$PREFORK=int($PREFORK/4); -while ($configline=) { - my ($id,$domain,$role,$name,$ip)=split(/:/,$configline); - chomp($ip); +# +# 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:$@\n"; +} - #$hostip{$ip}=$id; - $hostip{$id}=$ip; +# +# 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: $!"; - if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; } +# +# Write our PID on disk +my $execdir=$perlvar{'lonDaemons'}; +open (PIDSAVE,">$execdir/logs/lonsql.pid"); +print PIDSAVE "$$\n"; +close(PIDSAVE); +&logthis("CRITICAL: ---------- Starting ----------"); - #$PREFORK++; +# +# Ignore signals generated during initial startup +$SIG{HUP}=$SIG{USR1}='IGNORE'; +# Now we are on our own +# Fork off our children. +for (1 .. $PREFORK) { + make_new_child(); } -close(CONFIG); +# +# Install signal handlers. +$SIG{CHLD} = \&REAPER; +$SIG{INT} = $SIG{TERM} = \&HUNTSMAN; +$SIG{HUP} = \&HUPSMAN; -# -------------------------------------------------------- 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 -%childpid = (); # the other way around +# +# And maintain the population. +while (1) { + sleep; # wait for a signal (i.e., child's death) + for (my $i = $children; $i < $PREFORK; $i++) { + make_new_child(); # top up the child pool + } +} -%childatt = (); # number of attempts to start server - # for ID +######################################################## +######################################################## +=pod -sub REAPER { # takes care of dead children - $SIG{CHLD} = \&REAPER; - my $pid = wait; +=item &make_new_child - #$children --; - #&logthis("Child $pid died"); - #delete $children{$pid}; - - my $wasserver=$children{$pid}; - &logthis("CRITICAL: " - ."Child $pid for server $wasserver died ($childatt{$wasserver})"); - delete $children{$pid}; - delete $childpid{$wasserver}; - my $port = "$perlvar{'lonSockDir'}/$wasserver"; - unlink($port); +Inputs: None +Returns: None -} +=cut -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("CRITICAL: Shutting down"); - exit; # clean up with dignity +######################################################## +######################################################## +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) + or die "Can't unblock SIGINT for fork: $!\n"; + $children{$pid} = 1; + $children++; + return; + } 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("WARNING: Couldn't connect to database". + ": $@"); + # "($st secs): $@"); + 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 (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,$query, + $arg1,$arg2,$arg3)=split(/&/,$userinput); + my $query=unescape($query); + # + #send query id which is pid_unixdatetime_runningcounter + my $queryid = $thisserver; + $queryid .="_".($$)."_"; + $queryid .= time."_"; + $queryid .= $run; + print $client "$queryid\n"; + # + # &logthis("QUERY: $query - $arg1 - $arg2 - $arg3"); + 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,$command); + } + } else { + &logthis('Unable to do log query: '.$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'; + } + } + $result = &escape($locresult.':'); + if ($locresult) { + $result .= &escape(join(':',map{$_.'='.$replies{$_}} keys %replies)); + } + } 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'; + } + } else { + # Do an sql query + $result = &do_sql_query($query,$arg1,$arg2); + } + # result does not need to be escaped because it has already been + # escaped. + #$result=&escape($result); + &reply("queryreply:$queryid:$result",$conserver); + } + # tidy up gracefully and finish + # + # close the database handle + $dbh->disconnect + or &logthis("WARNING: Couldn't disconnect". + " from database $DBI::errstr : $@"); + # this exit is VERY important, otherwise the child will become + # a producer of more and more children, forking yourself into + # process death. + exit; + } } -sub HUPSMAN { # signal handler for SIGHUP - local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children - kill 'INT' => keys %children; - close($server); # free up socket - &logthis("CRITICAL: Restarting"); - my $execdir=$perlvar{'lonDaemons'}; - exec("$execdir/lonsql"); # here we go again +######################################################## +######################################################## + +=pod + +=item &do_sql_query + +Runs an sql metadata table query. + +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); + } } +sub do_sql_query { + my ($query,$custom,$customshow) = @_; +# &logthis('doing query '.$query); + $custom = &unescape($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(''. + 'WARNING: Could not retrieve from database:'. + $sth->errstr().''); + } 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) { + my $fh=IO::File->new($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 +######################################################## +######################################################## + +=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'}; @@ -117,35 +643,25 @@ sub logthis { print $fh "$local ($$): $message\n"; } -# ----------------------------------------------------------- Send USR1 to lonc -sub reconlonc { - my $peerfile=shift; - &logthis("Trying to reconnect for $peerfile"); - my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid"; - if (my $fh=IO::File->new("$loncfile")) { - my $loncpid=<$fh>; - chomp($loncpid); - if (kill 0 => $loncpid) { - &logthis("lonc at pid $loncpid responding, sending USR1"); - kill USR1 => $loncpid; - sleep 1; - if (-e "$peerfile") { return; } - &logthis("$peerfile still not there, give it another try"); - sleep 5; - if (-e "$peerfile") { return; } - &logthis( - "WARNING: $peerfile still not there, giving up"); - } else { - &logthis( - "CRITICAL: " - ."lonc at pid $loncpid not responding, giving up"); - } - } else { - &logthis('CRITICAL: lonc not running, giving up'); - } -} - # -------------------------------------------------- Non-critical communication + +######################################################## +######################################################## + +=pod + +=item &subreply + +Sends a command to a server. Called only by &reply. + +Inputs: $cmd,$server + +Returns: The results of the message or 'con_lost' on error. + +=cut + +######################################################## +######################################################## sub subreply { my ($cmd,$server)=@_; my $peerfile="$perlvar{'lonSockDir'}/$server"; @@ -156,10 +672,27 @@ sub subreply { print $sclient "$cmd\n"; my $answer=<$sclient>; chomp($answer); - if (!$answer) { $answer="con_lost"; } + $answer="con_lost" if (!$answer); return $answer; } +######################################################## +######################################################## + +=pod + +=item &reply + +Sends a command to a server. + +Inputs: $cmd,$server + +Returns: The results of the message or 'con_lost' on error. + +=cut + +######################################################## +######################################################## sub reply { my ($cmd,$server)=@_; my $answer; @@ -167,176 +700,304 @@ sub reply { $answer=subreply($cmd,$server); if ($answer eq 'con_lost') { $answer=subreply("ping",$server); - if ($answer ne $server) { - &reconlonc("$perlvar{'lonSockDir'}/$server"); - } $answer=subreply($cmd,$server); } } else { $answer='self_reply'; + $answer=subreply($cmd,$server); } return $answer; } -$unixsock = "msua1_sql"; -my $localfile="$perlvar{'lonSockDir'}/$unixsock"; -my $server=IO::Socket::UNIX->new(LocalAddr =>"$localfile", - Type => SOCK_STREAM, - Timeout => 10); +######################################################## +######################################################## -# ---------------------------------------------------- Fork once and dissociate -$fpid=fork; -exit if $fpid; -die "Couldn't fork: $!" unless defined ($fpid); +=pod -POSIX::setsid() or die "Can't start new session: $!"; +=item &escape -# ------------------------------------------------------- Write our PID on disk +Escape special characters in a string. -$execdir=$perlvar{'lonDaemons'}; -open (PIDSAVE,">$execdir/logs/lonsql.pid"); -print PIDSAVE "$$\n"; -close(PIDSAVE); -&logthis("CRITICAL: ---------- Starting ----------"); +Inputs: string to escape -# ----------------------------- Ignore signals generated during initial startup -$SIG{HUP}=$SIG{USR1}='IGNORE'; +Returns: The input string with special characters escaped. + +=cut + +######################################################## +######################################################## +sub escape { + my $str=shift; + $str =~ s/(\W)/"%".unpack('H2',$1)/eg; + return $str; +} + +######################################################## +######################################################## -# ------------------------------------------------------- Now we are on our own -#Fork of children one for every server +=pod -#for (1 .. $PREFORK) { -# make_new_child($thisserver); -#} +=item &unescape -foreach $thisserver (keys %hostip) { - make_new_child($thisserver); +Unescape special characters in a string. + +Inputs: string to unescape + +Returns: The input string with special characters unescaped. + +=cut + +######################################################## +######################################################## +sub unescape { + my $str=shift; + $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; + return $str; } -&logthis("Done starting initial servers"); -# ----------------------------------------------------- Install signal handlers +######################################################## +######################################################## -$SIG{CHLD} = \&REAPER; -$SIG{INT} = $SIG{TERM} = \&HUNTSMAN; -$SIG{HUP} = \&HUPSMAN; +=pod -# And maintain the population. -while (1) { - sleep; # wait for a signal (i.e., child's death) +=item &ishome - #for ($i = $children; $i < $PREFORK; $i++) { - # make_new_child(); # top up the child pool - #} - - foreach $thisserver (keys %hostip) { - if (!$childpid{$thisserver}) { - if ($childatt{$thisserver}<=$childmaxattempts) { - $childatt{$thisserver}++; - &logthis( - "INFO: Trying to reconnect for $thisserver " - ."($childatt{$thisserver} of $childmaxattempts attempts)"); - make_new_child($thisserver); - } - } +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\/$2/; + my ($udom,$uname)=split(/\//,$author); + my $proname=propath($udom,$uname); + if (-e $proname) { + return 1; + } else { + return 0; } } -sub make_new_child { - my $conserver=shift; - my $pid; - my $sigset; - my $queryid; +######################################################## +######################################################## - &logthis("Attempting to start child"); - # 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);#do the forking of children - - if ($pid) { - # Parent records the child's birth and returns. - sigprocmask(SIG_UNBLOCK, $sigset) - or die "Can't unblock SIGINT for fork: $!\n"; - $children{$pid} = 1; - $children++; - return; - } 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"; +=pod - #connect to the database - unless ( - my $dbh = DBI->connect("DBI:mysql:loncapa","root","mysql",{ RaiseError =>1,}) - ) { - my $st=120+int(rand(240)); - &logthis("WARNING: Couldn't connect to database ($st secs): $@"); - sleep($st); - exit;#do I need to cleanup before exit if can't connect to database - }; - - # handle connections until we've reached $MAX_CLIENTS_PER_CHILD - for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) { - $client = $server->accept() or last; - $run = $run+1; -# ============================================================================= - # do something with the connection -# ----------------------------------------------------------------------------- - my $userinput = "1"; - #while (my $userinput=<$client>) { - while (my $userinput="1") { - print ("here we go\n"); - chomp($userinput); - - #send query id which is pid_unixdatetime_runningcounter - $queryid = $conserver; - $queryid .=($$)."_"; - $queryid .= time."_"; - $queryid .= run; - print $client "$queryid\n"; - - #prepare and execute the query - - my $sth = $dbh->prepare("select * into outfile \"$queryid\" from resource");#can't use $userinput directly since we the query to write to a file which depends on the query id generated - - $sth->execute(); - if (-e "$queryid") { print "Oops ,file is already there!\n";} - else - { - print "error reading into file\n"; - } - - #connect to lonc and send the query results - $reply = reply($queryid,$conserver); - - } -# ============================================================================= +=item &propath + +Inputs: user name, user domain + +Returns: The full path to the users directory. + +=cut + +######################################################## +######################################################## +sub propath { + my ($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 + +=item &courselog + +Inputs: $path, $command + +Returns: unescaped string of values. + +=cut + +######################################################## +######################################################## +sub courselog { + my ($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 $line=) { + chomp($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 $line=) { + chomp($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 'log') && ($log!~/^Log/)) { $include=0; } + if (($filters{'action'} eq 'check') && ($log!~/^Check/)) + { $include=0; } + if ($include) { + push(@results,$timestamp.':'.$log); } - - # tidy up gracefully and finish - - # this exit is VERY important, otherwise the child will become - # a producer of more and more children, forking yourself into - # process death. - exit; } -} - + 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. +=item HUPSMAN + +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("CRITICAL: Shutting down"); + $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("CRITICAL: Restarting"); + 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("WARNING: Couldn't disconnect from database ". + " $DBI::errstr : $@"); + exit; +} +=pod +=back +=cut