--- loncom/xml/run.pm 2000/11/16 14:20:05 1.12 +++ loncom/xml/run.pm 2003/04/03 21:58:40 1.36 @@ -1,64 +1,140 @@ package Apache::run; +# +# $Id: run.pm,v 1.36 2003/04/03 21:58:40 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/ +# -sub evaluateold { - my ($expression,$safeeval,$decls) = @_; -# print "inside2 evaluate $decls with $expression
\n"; -# gerd's old method interpolates unset vars -# $safeeval->reval('return qq('.$expression.');'); - unless (defined $expression) { return ''; } - my $result = ''; - $@=''; - $safeeval->reval('$_=q|'.$expression.'|;'); - if ($@ eq '') { - $safeeval->reval('{'.$decls.'$_=~s/(\$[A-Za-z]\w*)/(defined(eval($1))?eval($1):$1)/ge;}'); - if ($@ eq '') { - $result = $safeeval->reval('return $_;'); - } else { - &Apache::lonxml::error("substitution on:$expression:with:$decls:caused"); - } - } else { - &Apache::lonxml::error("defining:$expression:caused"); - } - if ($@ ne '') {&Apache::lonxml::error($@);} - return $result -} +use HTML::Entities; $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE'; - my %oldexpressions=(); - while (!$oldexpressions{$_}) { - $oldexpressions{$_}=1; - $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[|\{][\w\'\"]+[\]\}])*?(\([\w\'\"]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg; + my %_LONCAPA_INTERNAL_oldexpressions=(); + while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) { + $_LONCAPA_INTERNAL_oldexpressions{$_}=1; + $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg; + if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;} } ENDEVALUATE sub evaluate { - my ($expression,$safeeval,$decls) = @_; - unless (defined $expression) { return ''; } - my $result = ''; - $@=''; - print $decls - $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression. - "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}'); -# $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}'); - if ($@ eq '') { - $result = $safeeval->reval('return $_;'); - chop $result; - } else { - &Apache::lonxml::error("substitution on:$expression:with:$decls:caused $@"); - } - return $result + my ($expression,$safeeval,$decls) = @_; + unless (defined($expression)) { return ''; } + if ($Apache::lonxml::evaluate < 1) { return $expression; } + my $result = ''; + $@=''; + $Apache::run::timeout=0; + $main::SIG{'ALRM'} = sub { + $Apache::run::timeout=1; + die("timeout"); + }; + my $innererror; + eval { + alarm($Apache::lonnet::perlvar{'lonScriptTimeout'}); + $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression. + "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}'); + $innererror=$@; + alarm(0); + }; + my $error=$@; + if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) { + $result = $safeeval->reval('return $_;'); + chomp $result; + } else { + if ($Apache::run::timeout) { + $error = 'Code ran too long. It ran for more than '. + Apache->request->server->timeout.' seconds'; + } + &Apache::lonxml::error('substitution on
'.
+			       &HTML::Entities::encode($expression).
+			       '
with
'.
+			       &HTML::Entities::encode($decls).
+			       '
caused
'.
+			       &HTML::Entities::encode($error).' '.
+			       &HTML::Entities::encode($innererror).
+			       '
'); + } + return $result } sub run { - my ($code,$safeeval) = @_; -# print "inside run\n"; - $@=''; - my $result=$safeeval->reval($code); - if ($@ ne '') { - &Apache::lonxml::error(":$code:caused"); - &Apache::lonxml::error($@); + my ($code,$safeeval,$hideerrors) = @_; + my @result; + $@=''; + $Apache::run::timeout=0; + $main::SIG{'ALRM'} = sub { + $Apache::run::timeout=1; + die("timeout"); + }; + my $innererror; + eval { + alarm($Apache::lonnet::perlvar{'lonScriptTimeout'}); + @result=$safeeval->reval($code); + $innererror=$@; + alarm(0); + }; + my $error=$@; + if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) { + if ($Apache::run::timeout) { + $error = 'Code ran too long. It ran for more than '. + Apache->request->server->timeout.' seconds'; + } + &Apache::lonxml::error('
'.&HTML::Entities::encode($error).' '.
+			       &HTML::Entities::encode($innererror).
+			       '
occured while running
'.
+			       &HTML::Entities::encode($code).'
'); + } + if ( $#result < '1') { + return $result[0]; + } else { + &Apache::lonxml::debug("Got lots results:$#result:"); + return (@result); + } +} + +sub dump { + my ($target,$safeeval)=@_; + my $dump=''; + foreach my $symname (sort keys %{$safeeval->varglob('main::')}) { + if (($symname!~/^\_/) && ($symname!~/\:$/)) { + my $line; + if ($safeeval->reval('defined($'.$symname.')')) { + $line='$'.$symname.'='.$safeeval->reval('$'.$symname); + } + if ($safeeval->reval('defined(@'.$symname.')')) { + $line='@'.$symname.'=('. + $safeeval->reval('join(",",@'.$symname.')').")"; + } + if ($safeeval->reval('defined(%'.$symname.')')) { + $line='%'.$symname.'=('; + $line.=$safeeval->reval('join(",",map { $_."=>".$'. + $symname.'{$_} } sort keys %'. + $symname.')').")" + } + if ($line ne '') { $dump.=&HTML::Entities::encode($line)."
\n"; } + } } - return $result; + $dump.=''; + return $dump; } 1;