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Diff for /loncom/lonmaxima between versions 1.5 and 1.30

version 1.5, 2006/03/03 23:41:38 version 1.30, 2007/06/12 23:48:45
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 %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
Line 56  my $lastlog;                           # Line 55  my $lastlog;                           #
 use vars qw($PREFORK $MAX_CLIENTS_PER_CHILD %children $children $status  use vars qw($PREFORK $MAX_CLIENTS_PER_CHILD %children $children $status
     $pidfile $port %perlvar $lastlog);      $pidfile $port %perlvar $lastlog);
     
 sub maximareply {  
     my ($cmd) = @_;  
     my $reply='';  
     my $error='';  
     my $exitstatus='';  
   
     unless ($cmd=~/\;\n$/) { $cmd.=";\n"; }  
   
     my ($cmd_in, $cmd_out, $cmd_err);  
     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 --;      $children--;
     delete $children{$pid};      delete($children{$pid});
 }  }
     
 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 197  if (-e $pidfile) { Line 156  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
Line 208  $port = "$perlvar{'lonSockDir'}/maximaso Line 167  $port = "$perlvar{'lonSockDir'}/maximaso
 unlink($port);  unlink($port);
     
   
 my $server;  my $server = IO::Socket::UNIX->new(Local  => $port,
 unless (     Type   => SOCK_STREAM,
   $server = IO::Socket::UNIX->new(Local  => $port,     Listen => 10 );
                                   Type   => SOCK_STREAM,  if (!$server) {
                                   Listen => 10 )      my $st=120+int(rand(240));
    ) {  
        my $st=120+int(rand(240));      &logthis("<font color=blue>WARNING: ".
        &logthis(       "Can't make server socket ($st secs):  .. exiting</font>");
          "<font color=blue>WARNING: ".  
          "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: $!";
     
Line 239  print PIDSAVE "$$\n"; Line 197  print PIDSAVE "$$\n";
 close(PIDSAVE);  close(PIDSAVE);
 &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");  &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
 &status('Starting');  &status('Starting');
    
    
   
   
             
   
   # Install signal handlers.
   $SIG{CHLD} = \&REAPER;
   $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
    
 # Fork off our children.  # Fork off our children.
 for (1 .. $PREFORK) {  for (1 .. $PREFORK) {
     &make_new_child($server);      &make_new_child($server);
 }  }
     
 # Install signal handlers.  
 $SIG{CHLD} = \&REAPER;  
 $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;  
    
 # And maintain the population.  # And maintain the population.
 while (1) {  while (1) {
     &status('Parent process, sleeping');      &status('Parent process, sleeping');
Line 269  sub make_new_child { Line 224  sub make_new_child {
     # 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          
             
         # 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");
   
           &logthis('New process started');
   
  &process_requests($server);          my $command=Expect->spawn('maxima');
    # 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; 
    };
   
    $command->log_stdout(0);
    #$command->log_file("$execdir/logs/lonmaxima.session.log");
           &getmaximaoutput($command);
   
           for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
               &status('Accepting connections');
               my $client = $server->accept()     or last;
               print $command ("display2d:false;kill(all);\n");
       &getmaximaoutput($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);
                       $client->close();
                       $command->hard_close();     
                       exit;
                   }
           &sync($command);
                   &status('Waiting for commands');
               }
           }
   
         # tidy up gracefully and finish          # tidy up gracefully and finish
   
           $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
         # process death.          # process death.
Line 299  sub make_new_child { Line 294  sub make_new_child {
     }      }
 }  }
   
 sub process_requests {  {
     my ($server) = @_;      my $counter;
     # handle connections until we've reached $MAX_CLIENTS_PER_CHILD      sub sync {
     for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {   my ($command)=@_;
  &status('Accepting connections');        $counter++;
  my $client = $server->accept()     or last;   my $expect=$counter.time;
  while (my $cmd=<$client>) {   print $command "$expect;\n";
     &status('Processing command');   while (1) {
     print $client &escape((&maximareply(&unescape($cmd)))[0])."\n";      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 = '(\(\%i(1)\)|Incorrect syntax\:)';
    } elsif ($command->match() =~ /\(\%i(\d+)\)/) {
               my $nextmatch = $1+1;
               $regexp = '(\(\%i'.$nextmatch.'\)|Incorrect syntax\:)';
           }
       }
       my $timeout = 20;
       my (undef,$error,$matched,$output) =
    $command->expect($timeout, -re => $regexp);
   
       if ($numcheck && $matched eq 'Incorrect syntax:') {
    $syntaxerr = 1;
    if (wantarray) {
       return ($matched,$syntaxerr);
    } else {
       return $matched;
    }
       }
       if ($error) {
    return 'Error: '.$error;
       }
       $output =~ s/\r+//g; # Remove Windows-style linebreaks
       my $foundoutput=0;
       my $realoutput='';
       foreach my $line (split(/\n/,$output)) {
          if ($line=~/\;/) { $foundoutput=1; next; }
          if (!$foundoutput) { next; }
          if ($line=~/^Incorrect syntax:/) { $syntaxerr = 1; next; }
          (my $label, $line) = ($line=~ /^(\(\%o\d+\))(.+)$/);
          if ($label) {
              $label=~s/\S/ /g;
              $line=$label.$line;
          }
          $realoutput.=$line."\n";
       }
       if (wantarray) {
           return ($realoutput,$syntaxerr);
       } else {
           return $realoutput;
       }
 }  }
Removed from v.1.5  
changed lines
  Added in v.1.30

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