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Diff for /loncom/lonmaxima between versions 1.14 and 1.18

version 1.14, 2006/03/08 14:22:14 version 1.18, 2006/05/10 01:08:01
Line 30 Line 30
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
   
    use Expect; 
 use IPC::Open3;  use IPC::Open3;
 use IO::Select;  use IO::Select;
 use IO::Socket;  use IO::Socket;
 use IO::File;  use IO::File;
 use Symbol;  use Symbol;
 use POSIX;  use POSIX;
 use Fcntl;  
 use Socket;  
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
 use LONCAPA::Configuration;  use LONCAPA::Configuration;
     
 use strict;  use strict;
   
 # global variables  # global variables
 my $STARTPORT              = 5664;     # port for first child's server  
 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 %usedmaximaports        = ();       # keys are the used maximaports  
 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 $pidfile;                           # file containg parent process pid
 my $port;                              # path to UNIX socket file  my $port;                              # path to UNIX socket file
 my %perlvar;                           # configuration file info  my %perlvar;                           # configuration file info
 my $lastlog;                           # last string that was logged  my $lastlog;                           # last string that was logged
 use vars qw($PREFORK $MAX_CLIENTS_PER_CHILD %children $children %usedmaximaports $status  
   use vars qw($PREFORK $MAX_CLIENTS_PER_CHILD %children $children $status
     $pidfile $port %perlvar $lastlog);      $pidfile $port %perlvar $lastlog);
     
 # ------------------------------------------------------------ Service routines   # ------------------------------------------------------------ Service routines 
Line 65  sub REAPER {                        # ta Line 62  sub REAPER {                        # ta
     $SIG{CHLD} = \&REAPER;      $SIG{CHLD} = \&REAPER;
     my $pid = wait;      my $pid = wait;
     $children--;      $children--;
     &logthis("Child $pid for port or process $children{$pid} died");  
     delete($usedmaximaports{$children{$pid}});  
     delete($children{$pid});      delete($children{$pid});
 }  }
     
Line 131  sub catchexception { Line 126  sub catchexception {
     die("Signal abend");      die("Signal abend");
 }  }
   
 # -------------------------------------------------- make a socket non-blocking  
 sub nonblock {  
     my $socket = shift;  
     my $flags;  
     if (ref($socket)) {   
        $flags = fcntl($socket, F_GETFL, 0)  
             or die "Can't get flags for socket: $!\n";  
        fcntl($socket, F_SETFL, $flags | O_NONBLOCK)  
             or die "Can't make socket nonblocking: $!\n";  
     }  
 }  
   
 # ---------------------------------------------------------------- Main program  # ---------------------------------------------------------------- Main program
 # -------------------------------- Set signal handlers to record abnormal exits  # -------------------------------- Set signal handlers to record abnormal exits
Line 218  close(PIDSAVE); Line 203  close(PIDSAVE);
 # Install signal handlers.  # Install signal handlers.
 $SIG{CHLD} = \&REAPER;  $SIG{CHLD} = \&REAPER;
 $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
    
 my $maximaport=$STARTPORT;   
 # Fork off our children.  # Fork off our children.
 for (1 .. $PREFORK) {  for (1 .. $PREFORK) {
     &make_new_child($server,$maximaport);      &make_new_child($server);
     $maximaport++;  
 }  }
     
 # And maintain the population.  # And maintain the population.
Line 232  while (1) { Line 215  while (1) {
     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; $i++) {
         &status('Parent process, starting child');          &status('Parent process, starting child');
         my $newport;          &make_new_child($server);           # top up the child pool
         &logthis("Current pool: ".join(', ',keys %usedmaximaports));  
         foreach my $testport ($STARTPORT .. $STARTPORT+$PREFORK-1) {  
             if (!$usedmaximaports{$testport}) { $newport=$testport; }  
         }  
         if ($newport) {  
            &make_new_child($server,$newport);           # top up the child pool  
         }  
     }      }
 }  }
                                                                                                                                                                   
 sub make_new_child {  sub make_new_child {
     my ($server,$maximaport) = @_;      my ($server) = @_;
   
     # block signal for fork      # block signal for fork
     my $sigset = POSIX::SigSet->new(SIGINT);      my $sigset = POSIX::SigSet->new(SIGINT);
Line 257  sub make_new_child { Line 233  sub make_new_child {
         # 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} = $maximaport;          $children{$pid} = 1;
         $children++;          $children++;
         $usedmaximaports{$maximaport}=1;  
         return;          return;
     } else {      } else {
         &logthis("Starting child on port $maximaport");  
         # 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 the MAXIMA port          &logthis('New process started');
         my $maximaserver = IO::Socket::INET->new(LocalPort => $maximaport,  
                                               Type      => SOCK_STREAM,          my $command=Expect->spawn('maxima');
                                               Proto     => 'tcp',          $command->log_stdout(0);
                                               Reuse     => 1,  
                                               Listen    => 10 )          &getmaximaoutput($command);
                         or die "making socket: $@\n";  
         &nonblock($maximaserver);  
         my $maximaselect=IO::Select->new($maximaserver);  
         sleep(2);  
   
         # open MAXIMA to talk to that port  
         my ($cmd_in, $cmd_out, $cmd_err);  
         my $maximapid = open3($cmd_in, $cmd_out, $cmd_err, "maxima -s $maximaport");  
         $children{$maximapid} = "Maxima $maximapid port $maximaport";  
         my $prompt=<$cmd_out>;  
         &logthis("Maxima $maximapid: $prompt");  
   
         # hopefully, MAXIMA calls us back  
         &status("Waiting $maximapid on $maximaport");  
         my $maximaclient=$maximaserver->accept();  
         $maximaselect->add($maximaclient);  
         &nonblock($maximaclient);  
         &status("$maximapid on $maximaport connected.");  
         &logthis("Maxima $maximapid on port $maximaport connected.");  
         &logthis('Initial reply: '.&maximareply($maximaselect));  
         # handle connections until we've reached $MAX_CLIENTS_PER_CHILD  
         for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {          for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
             &status('Accepting connections for '.$maximapid.' on '.$maximaport);             &status('Accepting connections');
             my $client = $server->accept()     or last;             my $client = $server->accept()     or last;
             while (my $cmd=<$client>) {             print $command "kill(all);reset();\n";
                 &status('Processing command by '.$maximapid.' on '.$maximaport);             &getmaximaoutput($command);
                 print $maximaclient &unescape($cmd).";\n";             while (my $cmd=<$client>) {
                 print $client &escape(&maximareply($maximaselect))."\n";                &status('Processing command');
             }        &sync($command);
                 print $command &unescape($cmd);
                 my $reply=&getmaximaoutput($command);
                 print $client &escape($reply)."\n";
                 if ($reply=~/^Error\:/) {
                    &logthis('Died through '.$reply);
                    $client->close();
                    $command->hard_close();     
                    exit;
                 }
                 &status('Waiting for commands');
              }
         }          }
   
         # tidy up gracefully and finish          # tidy up gracefully and finish
   
         if (ref($cmd_out)) { close($cmd_out); }          $command->soft_close();
         if (ref($cmd_err)) { close($cmd_err); }  
         if (ref($cmd_in)) { close($cmd_in); }  
   
         # 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 320  sub make_new_child { Line 283  sub make_new_child {
     }      }
 }  }
   
 sub maximareply {  {
    my ($maximaselect)=@_;      my $counter;
    my $output='';      sub sync {
    foreach my $ready ($maximaselect->can_read(1)) {   my ($command)=@_;
        my $data = '';   $counter++;
        my $rv   = $ready->recv($data, POSIX::BUFSIZ, 0);   my $expect=$counter.time;
        $output.=$data;   print $command "$expect;\n";
    }   while (1) {
    return $output;      my $output=&getmaximaoutput($command);
       if (($output=~/\Q$expect\E/) || ($output=~/^Error\:/)) {
    return;
       }
    }
       }
 }  }
   
   sub getmaximaoutput {
       my ($command)=@_;
       my (undef,$error,undef,$output)=$command->expect(20, -re => '\(\%i\d+\)');
       if ($error) {
          return 'Error: '.$error;
       }
       my $foundoutput=0;
       my $realoutput='';
       foreach my $line (split(/\n/,$output)) {
          if ($line=~/\;/) { $foundoutput=1; next; }
          if (!$foundoutput) { next; }
          my ($label)=($line=~s/^(\(\%o\d+\))//);
          if ($label) {
             $label=~s/\S/ /g;
             $line=$label.$line;
          }
          $realoutput.=$line."\n";
       }
       return $realoutput;
   }
Removed from v.1.14  
changed lines
  Added in v.1.18

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