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Diff for /loncom/lonsql between versions 1.50 and 1.75

version 1.50, 2002/07/05 15:07:59 version 1.75, 2006/02/10 09:47:36
Line 27 Line 27
 #  #
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
 # YEAR=2000  
 # lonsql-based on the preforker:harsha jagasia:date:5/10/00  =pod
 # 7/25 Gerd Kortemeyer  
 # many different dates Scott Harrison  =head1 NAME
 # YEAR=2001  
 # many different dates Scott Harrison  lonsql - LON TCP-MySQL-Server Daemon for handling database requests.
 # 03/22/2001 Scott Harrison  
 # 8/30 Gerd Kortemeyer  =head1 SYNOPSIS
 # 10/17,11/28,11/29,12/20 Scott Harrison  
 # YEAR=2001  This script should be run as user=www.  
 # 5/11 Scott Harrison  Note that a lonsql.pid file contains the pid of the parent process.
 #  
 ###  =head1 OVERVIEW
   
 ###############################################################################  =head2 Purpose within LON-CAPA
 ##                                                                           ##  
 ## ORGANIZATION OF THIS PERL SCRIPT                                          ##  LON-CAPA is meant to distribute A LOT of educational content to A LOT
 ## 1. Modules used                                                           ##  of people. It is ineffective to directly rely on contents within the
 ## 2. Enable find subroutine                                                 ##  ext2 filesystem to be speedily scanned for on-the-fly searches of
 ## 3. Read httpd config files and get variables                              ##  content descriptions. (Simply put, it takes a cumbersome amount of
 ## 4. Make sure that database can be accessed                                ##  time to open, read, analyze, and close thousands of files.)
 ## 5. Make sure this process is running from user=www                        ##  
 ## 6. Check if other instance is running                                     ##  The solution is to index various data fields that are descriptive of
 ## 7. POD (plain old documentation, CPAN style)                              ##  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 lib '/home/httpd/lib/perl/';
 use LONCAPA::Configuration;  use LONCAPA::Configuration;
   use LONCAPA::lonmetadata();
   
 use IO::Socket;  use IO::Socket;
 use Symbol;  use Symbol;
Line 66  use Socket; Line 114  use Socket;
 use Fcntl;  use Fcntl;
 use Tie::RefHash;  use Tie::RefHash;
 use DBI;  use DBI;
   use File::Find;
   use localenroll;
   
 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 loncapa_apache.conf and loncapa.conf  
 my $perlvarref=LONCAPA::Configuration::read_conf('loncapa_apache.conf',  
                                                  'loncapa.conf');  
 my %perlvar=%{$perlvarref};  
   
 # ------------------------------------- Make sure that database can be accessed  =pod
 {  
     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;  
     }  
 }  
   
 # --------------------------------------------- Check if other instance running  =item Global Variables
   
 my $pidfile="$perlvar{'lonDaemons'}/logs/lonsql.pid";  =over 4
   
 if (-e $pidfile) {  =item dbh
    my $lfh=IO::File->new("$pidfile");  
    my $pide=<$lfh>;  
    chomp($pide);  
    if (kill 0 => $pide) { die "already running"; }  
 }  
   
 # ------------------------------------------------------------- Read hosts file  =back
 $PREFORK=4; # number of children to maintain, at least four spare  
   
 open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";  =cut
   
 while ($configline=<CONFIG>) {  ########################################################
     my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);  ########################################################
     chomp($ip);  my $dbh;
   
     $hostip{$ip}=$id;  ########################################################
     if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }  ########################################################
   
     $PREFORK++;  =pod 
 }  
 close(CONFIG);  
   
 $PREFORK=int($PREFORK/4);  =item Variables required for forking
   
 $unixsock = "mysqlsock";  =over 4
 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";  
 }  
   
 # -------------------------------------------------------- Routines for forking  =item $MAX_CLIENTS_PER_CHILD
 # 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  
   
 sub REAPER {                        # takes care of dead children  The number of clients each child should process.
     $SIG{CHLD} = \&REAPER;  
     my $pid = wait;  
     $children --;  
     &logthis("Child $pid died");  
     delete $children{$pid};  
 }  
   
 sub HUNTSMAN {                      # signal handler for SIGINT  =item %children 
     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  The keys to %children  are the current child process IDs
     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 logthis {  =item $children
     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";  
 }  
   
 # ------------------------------------------------------------------ Course log  The current number of children
   
 sub courselog {  =back
     my ($path,$command)=@_;  
     my %filters=();  =cut 
     foreach (split(/\:/,&unescape($command))) {  
  my ($name,$value)=split(/\=/,$_);  ########################################################
         $filters{$name}=$value;  ########################################################
     }  my $MAX_CLIENTS_PER_CHILD  = 5;   # number of clients each child should process
     my @results=();  my %children               = ();  # keys are current child process IDs
     open(IN,$path.'/activity.log') or return ('file_error');  my $children               = 0;   # current number of children
     while ($line=<IN>) {                                 
         chomp($line);  ###################################################################
         my ($timestamp,$host,$log)=split(/\:/,$line);  ###################################################################
   
   =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
 #  #
 # $log has the actual log entries; currently still escaped, and  # Read loncapa_apache.conf and loncapa.conf
 # %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 &&&  my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
         $log=~s/\%26(\d+)\%3a/\&\&\&$1\%3a/g;  my %perlvar=%{$perlvarref};
 # now go over all log entries   #
         foreach (split(/\&\&\&/,&unescape($log))) {  # Write the /home/www/.my.cnf file 
     my ($time,$res,$uname,$udom,$action,@values)=split(/\:/,$_);  my $conf_file = '/home/www/.my.cnf';
             my $values=&unescape(join(':',@values));  if (! -e $conf_file) {
             $values=~s/\&/\:/g;      if (open MYCNF, ">$conf_file") {
             $res=&unescape($res);          print MYCNF <<"ENDMYCNF";
             my $include=1;  [client]
             if (($filters{'username'}) && ($uname ne $filters{'username'}))   user=www
                                                                { $include=0; }  password=$perlvar{'lonSqlAccess'}
             if (($filters{'domain'}) && ($udom ne $filters{'domain'}))   ENDMYCNF
                                                                { $include=0; }          close MYCNF;
             if (($filters{'url'}) && ($res!~/$filters{'url'}/))       } else {
                                                                { $include=0; }          warn "Unable to write $conf_file, continuing";
             if (($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));  
 }  }
   
 # -------------------------------------------------------------------- User log  
   
 sub userlog {  #
     my ($path,$command)=@_;  # Make sure that database can be accessed
     my %filters=();  #
     foreach (split(/\:/,&unescape($command))) {  my $dbh;
  my ($name,$value)=split(/\=/,$_);  unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
         $filters{$name}=$value;                              $perlvar{'lonSqlAccess'},
     }                              { RaiseError =>0,PrintError=>0})) { 
     my @results=();      print "Cannot connect to database!\n";
     open(IN,$path.'/activity.log') or return ('file_error');      my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
     while ($line=<IN>) {      my $subj="LON: $perlvar{'lonHostID'} Cannot connect to database!";
         chomp($line);      system("echo 'Cannot connect to MySQL database!' |".
         my ($timestamp,$host,$log)=split(/\:/,$line);             " mailto $emailto -s '$subj' > /dev/null");
         $log=&unescape($log);  
         my $include=1;      open(SMP,'>/home/httpd/html/lon-status/mysql.txt');
         if (($filters{'start'}) && ($timestamp<$filters{'start'}))       print SMP 'time='.time.'&mysql=defunct'."\n";
                                                              { $include=0; }      close(SMP);
         if (($filters{'end'}) && ($timestamp>$filters{'end'}))   
                                                              { $include=0; }      exit 1;
         if (($filters{'action'} eq 'log') && ($log!~/^Log/)) { $include=0; }  } else {
         if (($filters{'action'} eq 'check') && ($log!~/^Check/))       unlink('/home/httpd/html/lon-status/mysql.txt');
                                                              { $include=0; }      $dbh->disconnect;
         if ($include) {  }
    push(@results,$timestamp.':'.$log);  
         }  #
     }  # Check if other instance running
     close IN;  #
     return join('&',sort(@results));  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 %hostname;
   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 $configline=<CONFIG>) {
       my ($id,$domain,$role,$name)=split(/:/,$configline);
       $name=~s/\s//g;
       $thisserver=$name if ($id eq $perlvar{'lonHostID'});
       $hostname{$id}=$name;
       #$PREFORK++;
   }
   close(CONFIG);
   #
   #$PREFORK=int($PREFORK/4);
   
 # ---------------------------------------------------- Fork once and dissociate  #
 $fpid=fork;  # 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
   #
   my $fpid=fork;
 exit if $fpid;  exit if $fpid;
 die "Couldn't fork: $!" unless defined ($fpid);  die "Couldn't fork: $!" unless defined ($fpid);
   
 POSIX::setsid() or die "Can't start new session: $!";  POSIX::setsid() or die "Can't start new session: $!";
   
 # ------------------------------------------------------- Write our PID on disk  #
   # Write our PID on disk
 $execdir=$perlvar{'lonDaemons'};  my $execdir=$perlvar{'lonDaemons'};
 open (PIDSAVE,">$execdir/logs/lonsql.pid");  open (PIDSAVE,">$execdir/logs/lonsql.pid");
 print PIDSAVE "$$\n";  print PIDSAVE "$$\n";
 close(PIDSAVE);  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';  $SIG{HUP}=$SIG{USR1}='IGNORE';
 # ------------------------------------------------------- Now we are on our own      # Now we are on our own    
 # Fork off our children.  #    Fork off our children.
 for (1 .. $PREFORK) {  for (1 .. $PREFORK) {
     make_new_child();      make_new_child();
 }  }
   
   #
 # Install signal handlers.  # Install signal handlers.
 $SIG{CHLD} = \&REAPER;  $SIG{CHLD} = \&REAPER;
 $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
 $SIG{HUP}  = \&HUPSMAN;  $SIG{HUP}  = \&HUPSMAN;
   
   #
 # And maintain the population.  # And maintain the population.
 while (1) {  while (1) {
     sleep;                          # wait for a signal (i.e., child's death)      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          make_new_child();           # top up the child pool
     }      }
 }  }
   
   ########################################################
   ########################################################
   
   =pod
   
   =item &make_new_child
   
   Inputs: None
   
   Returns: None
   
   =cut
   
   ########################################################
   ########################################################
 sub make_new_child {  sub make_new_child {
     my $pid;      my $pid;
     my $sigset;      my $sigset;
           #
     # block signal for fork      # block signal for fork
     $sigset = POSIX::SigSet->new(SIGINT);      $sigset = POSIX::SigSet->new(SIGINT);
     sigprocmask(SIG_BLOCK, $sigset)      sigprocmask(SIG_BLOCK, $sigset)
         or die "Can't block SIGINT for fork: $!\n";          or die "Can't block SIGINT for fork: $!\n";
           #
     die "fork: $!" unless defined ($pid = fork);      die "fork: $!" unless defined ($pid = fork);
           #
     if ($pid) {      if ($pid) {
         # Parent records the child's birth and returns.          # Parent records the child's birth and returns.
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
Line 338  sub make_new_child { Line 363  sub make_new_child {
     } else {      } else {
         # Child can *not* return from this subroutine.          # Child can *not* return from this subroutine.
         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before          $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
       
         # unblock signals          # unblock signals
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die "Can't unblock SIGINT for fork: $!\n";              or die "Can't unblock SIGINT for fork: $!\n";
   
   
         #open database handle          #open database handle
  # making dbh global to avoid garbage collector   # making dbh global to avoid garbage collector
  unless (   unless ($dbh = DBI->connect("DBI:mysql:loncapa","www",
  $dbh = DBI->connect("DBI:mysql:loncapa","www",$perlvar{'lonSqlAccess'},{ RaiseError =>0,PrintError=>0})                                      $perlvar{'lonSqlAccess'},
  ) {                                       { RaiseError =>0,PrintError=>0})) { 
              sleep(10+int(rand(20)));              sleep(10+int(rand(20)));
     &logthis("<font color=blue>WARNING: Couldn't connect to database  ($st secs): $@</font>");              &logthis("<font color='blue'>WARNING: Couldn't connect to database".
     print "database handle error\n";                       ": $@</font>");
     exit;                       #  "($st secs): $@</font>");
               print "database handle error\n";
   };              exit;
  # make sure that a database disconnection occurs with ending kill signals          }
    # make sure that a database disconnection occurs with 
           # ending kill signals
  $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;   $SIG{TERM}=$SIG{INT}=$SIG{QUIT}=$SIG{__DIE__}=\&DISCONNECT;
   
         # handle connections until we've reached $MAX_CLIENTS_PER_CHILD          # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
         for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {          for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
             $client = $server->accept()     or last;              my $client = $server->accept() or last;
               
             # do something with the connection              # do something with the connection
     $run = $run+1;      $run = $run+1;
     my $userinput = <$client>;      my $userinput = <$client>;
     chomp($userinput);      chomp($userinput);
                       $userinput=~s/\:(\w+)$//;
               my $searchdomain=$1;
               #
     my ($conserver,$query,      my ($conserver,$query,
  $arg1,$arg2,$arg3)=split(/&/,$userinput);   $arg1,$arg2,$arg3)=split(/&/,$userinput);
     my $query=unescape($query);      my $query=unescape($query);
               #
             #send query id which is pid_unixdatetime_runningcounter              #send query id which is pid_unixdatetime_runningcounter
     $queryid = $thisserver;      my $queryid = $thisserver;
     $queryid .="_".($$)."_";      $queryid .="_".($$)."_";
     $queryid .= time."_";      $queryid .= time."_";
     $queryid .= $run;      $queryid .= $run;
     print $client "$queryid\n";      print $client "$queryid\n";
           #
     &logthis("QUERY: $query - $arg1 - $arg2 - $arg3");      # &logthis("QUERY: $query - $arg1 - $arg2 - $arg3");
     sleep 1;      sleep 1;
               #
             my $result='';              my $result='';
               #
 # ---------- At this point, query is received, query-ID assigned and sent back               # At this point, query is received, query-ID assigned and sent 
 # $query eq 'logquery' will mean that this is a query against log-files              # back, $query eq 'logquery' will mean that this is a query 
               # against log-files
               if (($query eq 'userlog') || ($query eq 'courselog')) {
    if (($query eq 'userlog') || ($query eq 'courselog')) {                  # beginning of log query
 # ----------------------------------------------------- beginning of log query                  my $udom    = &unescape($arg1);
 #                  my $uname   = &unescape($arg2);
 # this goes against a user's log file                  my $command = &unescape($arg3);
 #                  my $path    = &propath($udom,$uname);
        my $udom=&unescape($arg1);                  if (-e "$path/activity.log") {
        my $uname=&unescape($arg2);                      if ($query eq 'userlog') {
                my $command=&unescape($arg3);                          $result=&userlog($path,$command);
                my $path=&propath($udom,$uname);                      } else {
                if (-e "$path/activity.log") {                          $result=&courselog($path,$command);
    if ($query eq 'userlog') {                      }
                        $result=&userlog($path,$command);                  } else {
                    } else {                      &logthis('Unable to do log query: '.$uname.'@'.$udom);
                        $result=&courselog($path,$command);                      $result='no_such_file';
                    }                  }
                } else {                  # end of log query
    &logthis('Unable to do log query: '.$uname.'@'.$udom);              } elsif (($query eq 'fetchenrollment') || 
            $result='no_such_file';       ($query eq 'institutionalphotos')) {
        }                  # retrieve institutional class lists
 # ------------------------------------------------------------ end of log query                  my $dom = &unescape($arg1);
           } else {                  my %affiliates = ();
 # -------------------------------------------------------- This is an sql query                  my %replies = ();
     my $custom=unescape($arg1);                  my $locresult = '';
     my $customshow=unescape($arg2);                  my $querystr = &unescape($arg3);
             #prepare and execute the query                  foreach (split/%%/,$querystr) {
     my $sth = $dbh->prepare($query);                      if (/^([^=]+)=([^=]+)$/) {
                           @{$affiliates{$1}} = split/,/,$2;
     my @files;                      }
     my $subsetflag=0;                  }
     if ($query) {                  if ($query eq 'fetchenrollment') { 
  unless ($sth->execute())                      $locresult = &localenroll::fetch_enrollment($dom,\%affiliates,\%replies);
  {                  } elsif ($query eq 'institutionalphotos') {
     &logthis("<font color=blue>WARNING: Could not retrieve from database: $@</font>");                      my $crs = &unescape($arg2);
     $result="";      eval {
  }   local($SIG{__DIE__})='DEFAULT';
  else {   $locresult = &localenroll::institutional_photos($dom,$crs,\%affiliates,\%replies,'update');
     my $r1=$sth->fetchall_arrayref;      };
     my @r2;      if ($@) {
     foreach (@$r1) {my $a=$_;    $locresult = 'error';
  my @b=map {escape($_)} @$a;  
  push @files,@{$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));                  $result = &escape($locresult.':');
  # if file is indicated in sql database and                  if ($locresult) {
  # not part of sql-relevant query, do not pattern match.                      $result .= &escape(join(':',map{$_.'='.$replies{$_}} keys %replies));
  # if file is not in sql database, output error.                  }
  # if file is indicated in sql database and is              } elsif ($query eq 'prepare activity log') {
  # part of query result list, then do the pattern match.                  my ($cid,$domain) = map {&unescape($_);} ($arg1,$arg2);
  my $customresult='';                  &logthis('preparing activity log tables for '.$cid);
  my @r2;                  my $command = 
  foreach my $m (@metalist) {                      qq{$perlvar{'lonDaemons'}/parse_activity_log.pl -course=$cid -domain=$domain};
     my $fh=IO::File->new($m);                  system($command);
     my @lines=<$fh>;                  &logthis($command);
     my $stuff=join('',@lines);                  my $returnvalue = $?>>8;
     if ($stuff=~/$custom/s) {                  if ($returnvalue) {
  foreach my $f ('abstract','author','copyright',                      $result = 'error: parse_activity_log.pl returned '.
        'creationdate','keywords','language',                          $returnvalue;
        'lastrevisiondate','mime','notes',                  } else {
        'owner','subject','title') {                      $result = 'success';
     $stuff=~s/\n?\<$f[^\>]*\>.*?<\/$f[^\>]*\>\n?//s;                  }
  }              } else {
  my $m2=$m; my $docroot=$perlvar{'lonDocRoot'};                  # Do an sql query
  $m2=~s/^$docroot//;                  $result = &do_sql_query($query,$arg1,$arg2,$searchdomain);
  $m2=~s/\.meta$//;              }
  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);  
     }  
  }  
  $result=join("&",@r2) unless $query;  
  $result.=$customresult;  
     }  
 # ------------------------------------------------------------ end of sql query  
    }  
   
             # result does not need to be escaped because it has already been              # result does not need to be escaped because it has already been
             # escaped.              # escaped.
             #$result=&escape($result);              #$result=&escape($result);
   
     # reply with result, append \n unless already there  
   
     $result.="\n" unless ($result=~/\n$/);  
             &reply("queryreply:$queryid:$result",$conserver);              &reply("queryreply:$queryid:$result",$conserver);
   
         }          }
       
         # tidy up gracefully and finish          # tidy up gracefully and finish
           #
         #close the database handle          # close the database handle
  $dbh->disconnect   $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          # this exit is VERY important, otherwise the child will become
         # a producer of more and more children, forking yourself into          # a producer of more and more children, forking yourself into
         # process death.          # process death.
Line 517  sub make_new_child { Line 492  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;  =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,$customshow,$searchdomain) = @_;
   
   #
   # limit to searchdomain if given and table is metadata
   #
       if (($searchdomain) && ($query=~/FROM metadata/)) {
    $query.=' HAVING (domain="'.$searchdomain.'")';
       }
   #    &logthis('doing query ('.$searchdomain.')'.$query);
   
   
   
       $custom     = &unescape($custom);
       $customshow = &unescape($customshow);
       #
       @metalist = ();
       #
       my $result = '';
       my @results = ();
       my @files;
       my $subsetflag=0;
       #
       if ($query) {
           #prepare and execute the query
    &logthis($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) {
           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'};
       my $fh=IO::File->new(">>$execdir/logs/lonsql.log");
       my $now=time;
       my $local=localtime($now);
       print $fh "$local ($$): $message\n";
 }  }
   
 # -------------------------------------------------- Non-critical communication  # -------------------------------------------------- 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 {  sub subreply {
     my ($cmd,$server)=@_;      my ($cmd,$server)=@_;
     my $peerfile="$perlvar{'lonSockDir'}/$server";      my $peerfile="$perlvar{'lonSockDir'}/".$hostname{$server};
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",      my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                                       Type    => SOCK_STREAM,                                        Type    => SOCK_STREAM,
                                       Timeout => 10)                                        Timeout => 10)
        or return "con_lost";         or return "con_lost";
     print $sclient "$cmd\n";      print $sclient "sethost:$server:$cmd\n";
     my $answer=<$sclient>;      my $answer=<$sclient>;
     chomp($answer);      chomp($answer);
     if (!$answer) { $answer="con_lost"; }      $answer="con_lost" if (!$answer);
     return $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 {  sub reply {
   my ($cmd,$server)=@_;    my ($cmd,$server)=@_;
   my $answer;    my $answer;
Line 555  sub reply { Line 724  sub reply {
   return $answer;    return $answer;
 }  }
   
 # -------------------------------------------------------- Escape Special Chars  ########################################################
   ########################################################
   
   =pod
   
   =item &escape
   
   Escape special characters in a string.
   
   Inputs: string to escape
   
   Returns: The input string with special characters escaped.
   
   =cut
   
   ########################################################
   ########################################################
 sub escape {  sub escape {
     my $str=shift;      my $str=shift;
     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;      $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
     return $str;      return $str;
 }  }
   
 # ----------------------------------------------------- Un-Escape Special Chars  ########################################################
   ########################################################
   
   =pod
   
   =item &unescape
   
   Unescape special characters in a string.
   
   Inputs: string to unescape
   
   Returns: The input string with special characters unescaped.
   
   =cut
   
   ########################################################
   ########################################################
 sub unescape {  sub unescape {
     my $str=shift;      my $str=shift;
     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;      $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
     return $str;      return $str;
 }  }
   
 # --------------------------------------- Is this the home server of an author?  ########################################################
 # (copied from lond, modification of the return value)  ########################################################
   
   =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 {  sub ishome {
     my $author=shift;      my $author=shift;
     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;      $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
Line 585  sub ishome { Line 800  sub ishome {
     }      }
 }  }
   
 # -------------------------------------------- Return path to profile directory  ########################################################
 # (copied from lond)  ########################################################
   
   =pod
   
   =item &propath
   
   Inputs: user name, user domain
   
   Returns: The full path to the users directory.
   
   =cut
   
   ########################################################
   ########################################################
 sub propath {  sub propath {
     my ($udom,$uname)=@_;      my ($udom,$uname)=@_;
     $udom=~s/\W//g;      $udom=~s/\W//g;
Line 597  sub propath { Line 825  sub propath {
     return $proname;      return $proname;
 }   } 
   
 # ----------------------------------- POD (plain old documentation, CPAN style)  ########################################################
   ########################################################
   
 =head1 NAME  =pod
   
 lonsql - LON TCP-MySQL-Server Daemon for handling database requests.  =item &courselog
   
 =head1 SYNOPSIS  Inputs: $path, $command
   
 This script should be run as user=www.  The following is an example invocation  Returns: unescaped string of values.
 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  
   
 =head1 OSNAMES  =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 'log') && ($log!~/^Log/)) { $include=0; }
           if (($filters{'action'} eq 'check') && ($log!~/^Check/)) 
                                                                { $include=0; }
           if ($include) {
      push(@results,$timestamp.':'.$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.
   
   =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("<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  =cut
Removed from v.1.50  
changed lines
  Added in v.1.75

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