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Diff for /loncom/lonmaxima between versions 1.4 and 1.43

version 1.4, 2006/03/03 23:31:06 version 1.43, 2018/10/29 02:57:30
Line 30 Line 30
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
   
    use Expect; 
 use IPC::Open3;  
 use IO::Select;  use IO::Select;
 use IO::Socket;  use IO::Socket;
 use IO::File;  use IO::File;
Line 44  use strict; Line 43  use strict;
   
 # global variables  # global variables
 my $PREFORK                = 5;        # number of children to maintain  my $PREFORK                = 5;        # number of children to maintain
 my $MAX_CLIENTS_PER_CHILD  = 5;        # number of clients each child should process  my $MAX_CLIENTS_PER_CHILD  = 50;       # number of clients each child should process
   my $extra_children         = 0;
 my %children               = ();       # keys are current child process IDs  my %children               = ();       # keys are current child process IDs
 my $children               = 0;        # current number of children  my $children               = 0;        # current number of children
 my $status;                            # string for current status  my $status;                            # string for current status
   my $pidfile;                           # file containg parent process pid
   my $port;                              # path to UNIX socket file
   my %perlvar;                           # configuration file info
   my $lastlog;                           # last string that was logged
   
 use vars qw($PREFORK $MAX_CLIENTS_PER_CHILD %children $children $status  use vars qw($PREFORK $MAX_CLIENTS_PER_CHILD %children $children $status
     $cmd_in $cmd_out $cmd_err $pidfile $port %perlvar $lastlog      $pidfile $port %perlvar $lastlog);
     $currenthostid $client $server $cmd  
     );  
    
 sub maximareply {  
     my ($cmd) = @_;  
     my $reply='';  
     my $error='';  
     my $exitstatus='';  
   
     unless ($cmd=~/\;\n$/) { $cmd.=";\n"; }  
     my $pid = open3($cmd_in, $cmd_out, $cmd_err, 'maxima');  
     $children{$pid} = 1;  
       
     print $cmd_in $cmd;  
     close $cmd_in;  
   
     &status("Command sent");  
   
     my $selector = IO::Select->new();  
     $selector->add($cmd_err, $cmd_out);  
       
     while (my @ready = $selector->can_read) {  
  foreach my $fh (@ready) {  
     if (fileno($fh) == fileno($cmd_err)) {  
  $error.=<$cmd_err>;  
     } else {  
  my $line = scalar <$cmd_out>;  
                 if ($line=~/^(\(\%o|\s)/) {  
                    $line=~s/^\(.*\)/     /;   
                    $reply.=$line;   
        }  
     }  
     $selector->remove($fh) if eof($fh);  
  }  
     }  
     close $cmd_out;  
     close $cmd_err;  
     &status("Command processed");  
     return ($reply,$error,$exitstatus);  
 }  
     
 # ------------------------------------------------------------ Service routines   # ------------------------------------------------------------ Service routines 
 sub REAPER {                        # takes care of dead children   sub REAPER {                        # takes care of dead children 
                                     # and MAXIMA processes                                      # and MAXIMA processes
     $SIG{CHLD} = \&REAPER;      $SIG{CHLD} = \&REAPER;
     my $pid = wait;      my $pid = wait;
     $children --;      if (exists($children{$pid})) {
     delete $children{$pid};   $children--;
    delete($children{$pid});
    if ($extra_children) {
       $extra_children--;
    }
       }    
 }  }
     
 sub HUNTSMAN {                      # signal handler for SIGINT  sub HUNTSMAN {                      # signal handler for SIGINT
     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children      local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
     kill 'INT' => keys %children;      kill('INT' => keys(%children));
     unlink($pidfile);      unlink($pidfile);
     unlink($port);      unlink($port);
     &logthis('---- Shutdown ----');      &logthis('---- Shutdown ----');
Line 156  sub catchexception { Line 125  sub catchexception {
     $SIG{QUIT}='DEFAULT';      $SIG{QUIT}='DEFAULT';
     $SIG{__DIE__}='DEFAULT';      $SIG{__DIE__}='DEFAULT';
     chomp($signal);      chomp($signal);
     &logthis("<font color=red>CRITICAL: "      &logthis("<font color=\"red\">CRITICAL: "
      ."ABNORMAL EXIT. Child $$ died through "       ."ABNORMAL EXIT. Child $$ died through "
      ."\"$signal\"</font>");       ."\"$signal\"</font>");
     die("Signal abend");      die("Signal abend");
 }  }
    
   
   
   sub child_announce_death {
       $SIG{USR1} = \&child_announce_death;
       if ($extra_children < $PREFORK*10) {
    $extra_children++;
       }
   }
   
 # ---------------------------------------------------------------- Main program  # ---------------------------------------------------------------- Main program
 # -------------------------------- Set signal handlers to record abnormal exits  # -------------------------------- Set signal handlers to record abnormal exits
     
     
 $SIG{'QUIT'}=\&catchexception;  $SIG{'QUIT'}=\&catchexception;
 $SIG{__DIE__}=\&catchexception;  $SIG{__DIE__}=\&catchexception;
   $SIG{USR1} = \&child_announce_death;
     
 # ---------------------------------- Read loncapa_apache.conf and loncapa.conf  # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
 &status("Read loncapa.conf and loncapa_apache.conf");  &status("Read loncapa.conf and loncapa_apache.conf");
Line 178  $SIG{__DIE__}=\&catchexception; Line 154  $SIG{__DIE__}=\&catchexception;
 # ----------------------------- Make sure this process is running from user=www  # ----------------------------- Make sure this process is running from user=www
 my $wwwid=getpwnam('www');  my $wwwid=getpwnam('www');
 if ($wwwid!=$<) {  if ($wwwid!=$<) {
    my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";      my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
    my $subj="LON: $currenthostid User ID mismatch";      my $subj="LON: User ID mismatch";
    system("echo 'User ID mismatch.  lonmaxima must be run as user www.' |\      system("echo 'User ID mismatch.  lonmaxima must be run as user www.' |".
  mailto $emailto -s '$subj' > /dev/null");             " mailto -s '$subj' $emailto > /dev/null");
    exit 1;      exit 1;
 }  }
     
 # --------------------------------------------- Check if other instance running  # --------------------------------------------- Check if other instance running
Line 190  if ($wwwid!=$<) { Line 166  if ($wwwid!=$<) {
 $pidfile="$perlvar{'lonDaemons'}/logs/lonmaxima.pid";  $pidfile="$perlvar{'lonDaemons'}/logs/lonmaxima.pid";
     
 if (-e $pidfile) {  if (-e $pidfile) {
    my $lfh=IO::File->new("$pidfile");      my $lfh=IO::File->new("$pidfile");
    my $pide=<$lfh>;      my $pide=<$lfh>;
    chomp($pide);      chomp($pide);
    if (kill 0 => $pide) { die "already running"; }      if (kill(0 => $pide)) { die "already running"; }
 }  }
   
 # ------------------------------------------------------- Listen to UNIX socket  # ------------------------------------------------------- Listen to UNIX socket
 &status("Opening socket");  &status("Opening socket");
     
Line 203  $port = "$perlvar{'lonSockDir'}/maximaso Line 180  $port = "$perlvar{'lonSockDir'}/maximaso
 unlink($port);  unlink($port);
     
   
 unless (  my $server = IO::Socket::UNIX->new(Local  => $port,
   $server = IO::Socket::UNIX->new(Local  => $port,     Type   => SOCK_STREAM,
                                   Type   => SOCK_STREAM,     Listen => 10 );
                                   Listen => 10 )  if (!$server) {
    ) {      my $st=120+int(rand(240));
        my $st=120+int(rand(240));  
        &logthis(      &logthis("<font color=blue>WARNING: ".
          "<font color=blue>WARNING: ".       "Can't make server socket ($st secs):  .. exiting</font>");
          "Can't make server socket ($st secs):  .. exiting</font>");  
        sleep($st);      sleep($st);
        exit;      exit;
      };  }
           
     
 # ---------------------------------------------------- Fork once and dissociate  # ---------------------------------------------------- Fork once and dissociate
     
 my $fpid=fork;  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
     
 my $execdir=$perlvar{'lonDaemons'};  my $execdir=$perlvar{'lonDaemons'};
 open (PIDSAVE,">$execdir/logs/lonmaxima.pid");  open(PIDSAVE,">$execdir/logs/lonmaxima.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>");
 &status('Starting');  &status('Starting');
    
    
   
   
             
 # Fork off our children.  
 for (1 .. $PREFORK) {  
     &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;
     
   # Fork off our children.
   for (1 .. $PREFORK) {
       &make_new_child($server);
   }
    
 # And maintain the population.  # And maintain the population.
 while (1) {  while (1) {
     &status('Parent process, sleeping');      &status('Parent process, sleeping');
     sleep;                          # wait for a signal (i.e., child's death)      sleep;                          # wait for a signal (i.e., child's death)
     for (my $i = $children; $i < $PREFORK; $i++) {      for (my $i = $children; $i < $PREFORK+$extra_children; $i++) {
         &status('Parent process, starting child');          &status('Parent process, starting child');
         &make_new_child();           # top up the child pool          &make_new_child($server);           # top up the child pool
     }      }
 }  }
                                                                                                                                                                   
 sub make_new_child {  sub make_new_child {
       my ($server) = @_;
   
     # block signal for fork      # block signal for fork
     my $sigset = POSIX::SigSet->new(SIGINT);      my $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 (my $pid = fork);      die("fork: $!") unless defined(my $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)
             or die "Can't unblock SIGINT for fork: $!\n";              or die("Can't unblock SIGINT for fork: $!\n");
         $children{$pid} = 1;          $children{$pid} = 1;
         $children++;          $children++;
         return;          return;
     } 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          
    my $ppid = getppid();
             
         # 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");
   
  &process_requests();          &logthis('New process started');
   
           my $command = new Expect();
           $command->log_stdout(0);
           #$command->log_file("$execdir/logs/lonmaxima.session.log");
           $command->spawn('maxima');
           &getmaximaoutput($command, 2); # wait for maxima to finish initialization
    # soft/hard_close can take awhile and we really
           # don't care we just want it gone
    $SIG{INT} = sub {
       my $pid = $command->pid();
       kill('KILL'=>$pid);
       exit; 
    };
   
   
           for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
               &status('Accepting connections');
               my $client = $server->accept()     or last;
               &sync($command);
               print $command ("display2d:false;simp:true;kill(all);\n");
       &getmaximaoutput($command,2);
               &sync($command);
               my $syntaxerr = 0;
               while (my $cmd=<$client>) {
                   &status('Processing command');
                   print $command &unescape($cmd);
                   my ($reply,$syntaxerr) = &getmaximaoutput($command,1);
                   print $client &escape($reply)."\n";
                   if ($syntaxerr) {
                       last;
                   } elsif ($reply=~/^Error\:/) {
                       &logthis('Died through '.$reply);
       kill('USR1' => $ppid);
                       $client->close();
                       $command->hard_close();     
                       exit;
                   }
           &sync($command);
                   &status('Waiting for commands');
               }
           }
   
    kill('USR1' => $ppid);
    print $command ("quit();\n");
         # tidy up gracefully and finish          # tidy up gracefully and finish
    sleep(15);
           $command->soft_close();
   
         # 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
Line 292  sub make_new_child { Line 313  sub make_new_child {
     }      }
 }  }
   
 sub process_requests {  {
     # handle connections until we've reached $MAX_CLIENTS_PER_CHILD      my $counter;
     for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {      sub sync {
  &status('Accepting connections');        my ($command)=@_;
  $client = $server->accept( )     or last;   $counter++;
  while ($cmd=<$client>) {   my $expect=$counter.time;
     &status('Processing command');   print $command "$expect;\n";
     print $client &escape((&maximareply(&unescape($cmd)))[0])."\n";   while (1) {
       my $output=&getmaximaoutput($command,1);
       if (($output=~/\Q$expect\E/) || ($output=~/^Error\:/)) {
    return;
       }
    }
       }
   }
   
   sub getmaximaoutput {
       my ($command,$numcheck)=@_;
       my $regexp = '\(\%i\d+\)';
       my $syntaxerr=0;
       if ($numcheck) {
           if ($numcheck eq 2) {
       # command was the killall so should get a full reset on
       # command numbers
       $regexp = '(\(\%i(1)\)|[Ii]ncorrect syntax\:)';
    } elsif ($command->match() =~ /\(\%i(\d+)\)/) {
               my $nextmatch = $1+1;
               $regexp = '(\(\%i'.$nextmatch.'\)|[Ii]ncorrect syntax\:)';
           }
       }
       my $timeout = 20;
       my (undef,$error,$matched,$output) =
    $command->expect($timeout, -re => $regexp);
   
       if ($numcheck && lc($matched) eq 'incorrect syntax:') {
    $syntaxerr = 1;
    if (wantarray) {
       return ($matched,$syntaxerr);
    } else {
       return $matched;
  }   }
     }          }
       if ($error) {
    return 'Error: '.$error;
       }
       $output =~ s/\r+//gs; # Remove Windows-style linebreaks
       my $foundoutput=0;
       my $found_label=0;
       my $realoutput='';
       foreach my $line (split(/\n/,$output)) {
          if ($line=~/\;/) { $foundoutput=1; next; }
          if (!$foundoutput) { next; }
          if ($line=~/^[Ii]ncorrect syntax:/) { $syntaxerr = 1; next; }
          if ($line=~ /^(\(\%o\d+\))(.+)$/){
              my $label = $1;
              $line = $2;
              $label =~s/\S/ /g;
              $line=$label.$line;
      $found_label=1;
          }
          if ($found_label) {
      $realoutput.=$line."\n";
          }
       }
       if (wantarray) {
           return ($realoutput,$syntaxerr);
       } else {
           return $realoutput;
       }
 }  }
Removed from v.1.4  
changed lines
  Added in v.1.43

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