eval inside of reval inside of modperl, and $@

[Gerd Kortemeyer]

Hi,

I might be totally confusing myself, but I do have problems with the $@
variable inside of a Safe compartment inside of an Apache modperl
module.

The following subroutine returns "Oops Illegal division by zero ..."
when called from a standalone program, and "No problem" when called
inside a modperl module:


sub initsheet {
my $safeeval = new Safe(shift);
$safeeval->permit("entereval");
$safeeval->share('$@');

my $stuff=(<<'ENDSTUFF');
my $a=5;
my $b=0;

my $c=eval '$a/$b';
if ($@) {
return 'Oops '.$@;
} else {
return 'No problem!';
}
ENDSTUFF

return $safeeval->reval($stuff);
}

In spite of the division by zero in the $c=eval ... statement, $@ is not
set when inside of modperl.

BTW, the $safeeval->share('$@') was necessary to get this to work at
all, even as standalone. Now, maybe I need to share something else when
inside modperl?

Anybody any ideas what's going on?

THANKS!

- Gerd.

Re: Redirect with anchors.

[Gerd Kortemeyer]

1) First suggestion:

Try

 $req_rec->header_out("Location" => "intranet.html#anchor_name?action=show");

Seems like that is the order that at least Netscape puts GET-parms and anchors
in.

2) If the above does not work, try

$req_rec->header_out("Location" =>
"intranet.html?action=show&anchor=anchor_name");

Then have the handler for intranet.html spit out a line of JavaScript:

document.location.hash='anchor_name';

... works amazingly well. No need for anybody to tell me just how yucky this is.

3) Alternatively, try to find out if it is not Apache that somehow eats your "#"
- you might have to escape that.

- Gerd.


Elizabeth Mattijsen wrote:

> At 02:56 PM 4/8/01 +0200, Antti Linno wrote:
> >$req_rec->header_out("Location" => "intranet.html?action=show#anchor_name");
>
> I think you should provide the _complete_ URL, including the http://server
> part.  Some browser do not handle incomplete URL's like this in a redirect
> correctly.  Please someone correct me if I'm wrong here...
>
> >The html has such tag, but redirect shows no effect. Tried with simple
> >html link and it worked.
> >Any ideas how to get to some anchor in the middle of the page?
>
> Some browsers support the ?action#anchor syntax.  Some don't (particularly
> not too recent MSIE's).  If you really want to reliably do this, you should
> hide your parameter in the URL and use a RewriteRule or a mod_perl handler
> to extract the parameter, e.g. instead of
> "intranet.html?action=show#anchor_name" use a URL in the form
> "/show/intranet.html#anchor".
>
> Hope this helps...
>
> Elizabeth Mattijsen


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Re: 1 Billion Bug 1BB - [OT] UNIX timestamp hits 1,000,000,000 thisyear!

[Gerd Kortemeyer]

I will open my consulting business on Mon, Jan 18th, 2038.

- Gerd.

Nigel Hamilton wrote:
> 
> HI,
> I'm waiting to see how quickly someone starts the 1 Billion Bug
> (1BB) Consultancy ... scary.
> 
> NIge
> 
> Nigel Hamilton
> __
> http://turbo10.com  Turbo10 Search Engine   Search Fast. Browse Faster.
> 
> On Fri, 9 Mar 2001, Tim Bunce wrote:
> 
> > On Fri, Mar 09, 2001 at 12:44:59AM -0500, Bill Desjardins wrote:
> > >
> > > Just as a FYI about something that caught my attention recently. This year
> > > on Saturday September 8, 2001, the unix time stamp flips to 1 billion and
> > > gets another digit going from 9 to 10 digits. Not sure if anyone else but
> > > me is using the timestamp in ways that were set to 9 digits, such as DB
> > > column int length or in strings of fixed lengths, but these possibilities
> > > should be looked at just in case they could fail when the time changes to
> > > the longer int.
> >
> > Another common bug-waiting-to-happen is sorting the unix time stamp
> > values as strings instead of numbers.
> >
> > Tim.
> >

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Re: [JOB] mod_perl programmers needed

[Gerd Kortemeyer]

Hi,

I have received several emails in response to the posting below, but all
of them were asking about telecommuting. So let me answer that
on-the-list.

We have not yet seriously considered telecommuting, and would have to
discuss this option in our group, as well as with the admin folks. In
principle, I *think* this would be possible, but

 * individuals would have to be willing to come to campus for about a week
to get oriented
 * since this is a networked system which relies on persistent connections
between the nodes, the individual would have to be able to dedicate one
box with a permanent internet connection to this (at least cable modem or
something)
 * we would probably contract on an hourly base for telecommuters

We would have to work out feasibility and details on an individual base.

- Gerd.

Gerd Kortemeyer wrote:

> We need programmers to work on an open source project
>
>  http://www.lon-capa.org/
>
> - check out "Technical Background" for some - guess what - technical
> background (slightly outdated).
>
> If this looks interesting to you, please send me an email off-the-list.
> Note that this is a ".edu/.org" rather than a ".com" .
>
> - Gerd.

[JOB] mod_perl programmers needed

[Gerd Kortemeyer]

We need programmers to work on an open source project

 http://www.lon-capa.org/

- check out "Technical Background" for some - guess what - technical
background (slightly outdated).

If this looks interesting to you, please send me an email off-the-list.
Note that this is a ".edu/.org" rather than a ".com" .

- Gerd.

Re: Sporadic server errors

[Gerd Kortemeyer]

Craig Muth wrote:

>
> Here is another error:
> Modification of a read-only value attempted at /usr/lib/perl5/5.00503/Exporter.pm 
>line 40.
> BEGIN failed--compilation aborted at
> /home/sites/your.studentloanfunding.com/your-lib/eAward/GenerateOtherSections.pm 
>line 56.
>
> line 56 is:
> use POSIX qw(strftime);
>
> Both errors only happen sometimes, and don't show up other times, hardly
> ever showing up on the devel server.

Hmm, how about

http://www.bitmechanic.com/mail-archives/modperl/Dec1997/0199.html

- Gerd.



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Re: long background tasks

[Gerd Kortemeyer]

Sorry all, this should have been $r->rflush() - too many r's ... I guess the
additional "r" was meant as a reminder that this is a low-level call, and
flushing buffers results in a performance hit, and should not be done for no
good reason.

- Gerd.

Gerd Kortemeyer wrote:
> 
> You need $r->flush();
> 
> 1) Send out header
> 2) Use $r->print(...) to give some "please be patient" message or something
> 3) End the first chunk of info with "\n", so that the browser knows enough
> about the page layout to start page output.
> 4) Use $r->flush();
> 5) Do your long task
> 6) Produce rest of your page
> 
> - Gerd.

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Re: long background tasks

[Gerd Kortemeyer]

You need $r->flush();

1) Send out header
2) Use $r->print(...) to give some "please be patient" message or something
3) End the first chunk of info with "\n", so that the browser knows enough
about the page layout to start page output.
4) Use $r->flush();
5) Do your long task
6) Produce rest of your page

- Gerd.

Paul wrote:
> 
> --- Louis-David Mitterrand <[EMAIL PROTECTED]> wrote:
> > Hello,
> >
> > Were are trying to run long a task (DB import) from a HTML::Mason
> > page and are trying to send an immediate response to the user while
> > the task is running. Here is our pseudo-code:
> >
> > <%init>
> > sub long_running_task {
> >   # lottsa long, boring stuff
> > }
> > $r->puch_handlers(PerlCleanupHandler=>\&long_running_task($myarg));
> > 
> >
> > The rest of the page sends back HTML. The problem is that it _not_
> > sent back until the long_running_task function has completed.
> >
> > I thought that when registering a code ref in that way the sub{}
> > would not be called until later during the PerlCleanupHandler phase.
> >
> > Am I missing something, is there a better way to do it?
> >
> > Thanks in advance for your insight,
> 
> Since you're pushing that handler onto the cleanup phase, I'm assuming
> that you don't mean to send any more data to the client. It sounds like
> the buffer isn't getting flushed (though I can't imagine why). Maybe if
> you flush it manually? "local $|=1" or something?
> 
> I've had this problem in cases where I wanted to fork a long running
> subprocess, because the child's STDIN and STDOUT are still pegged to
> the browser socket. For a child, it works pretty well to close and
> reopen the STD' filehandles to dissociate from the client after the
> fork (like running a daemon).
> 
> Would that do for what you need here?
> 
> > --
> >  HIPPOLYTE: Quelques crimes toujours précèdent les grands crimes.
> > Quiconque a pu franchir les bornes légitimes
> > Peut violer enfin les droits les plus sacrés ;
> >   (Phèdre, J-B Racine, acte
> > 4, scène 2)
> 
> ...since I don't have a copy of Phaedra on my desk, would you translate
> this for me?  My French is nowhere near good enough for this one. ;o]
> 
> Cheers, and good luck.
> 
> __
> Do You Yahoo!?
> Yahoo! Auctions - Buy the things you want at great prices.
> http://auctions.yahoo.com/

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Re: Redirecting a multipart/form-data POST request

[Gerd Kortemeyer]

> I am writing a program that needs to process form data, (here's
>   the kicker) which is sometimes multipart/form-data, then
>   redirect a user to a GET request (which doesn't need to process
>   the form data).  I would like to use the standard mechanism for
>   issuing a redirect, for other reasons:
>
>   $r->header_out('Location' => $url);
>   return REDIRECT;
>

Not sure what the problem is, but I frequently use REDIRECTs and receive both
"normal" and "multipart" posts.

Please find the code section below that I use to get the POSTed data. After
that, in order to REDIRECT, I use

  $r->content_type('text/html');
   $r->header_out(Location =>
'http://'.$ENV{'HTTP_HOST'}.$disurl);
   return REDIRECT;

Hope this helps.

Enjoy,

- Gerd.

 Getting all kind of posted stuff:

my $buffer;

$r->read($buffer,$r->header_in('Content-length'));

unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si)
{
my @pairs=split(/&/,$buffer);
my $pair;
foreach $pair (@pairs) {
   my ($name,$value) = split(/=/,$pair);
   $value =~ tr/+/ /;
   $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
   $name  =~ tr/+/ /;
   $name  =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
   $ENV{"form.$name"}=$value;
}
} else {
my $contentsep=$1;
my @lines = split (/\n/,$buffer);
my $name='';
my $value='';
my $fname='';
my $fmime='';
my $i;
for ($i=0;$i<=$#lines;$i++) {
if ($lines[$i]=~/^$contentsep/) {
if ($name) {
chomp($value);
if ($fname) {
$ENV{"form.$name.filename"}=$fname;
$ENV{"form.$name.mimetype"}=$fmime;
} else {
$value=~s/\s+$//s;
}
$ENV{"form.$name"}=$value;
}
if ($i<$#lines) {
$i++;
$lines[$i]=~

/Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i;
$name=$1;
$value='';
if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) {
   $fname=$1;
   if
($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) {

  $fmime=$1;
  $i++;
   } else {
  $fmime='';
   }
} else {
$fname='';
$fmime='';
}
$i++;
}
} else {
$value.=$lines[$i]."\n";
}
}
}
$r->method_number(M_GET);
$r->method('GET');
$r->headers_in->unset('Content-length');



>


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Re: How do you run libapreq-0.31/eg/perl/file_upload.pl

[Gerd Kortemeyer]

Alexander Farber wrote:

> However I have this strange problem now: the web page doesn't change
> until I reload it. (Un)commenting "PerlSendHeader On" doesn't help.
> The only ways to see the expected results (like the initial empty web
> form, when entering http://localhost/cgi-perl/file_upload.pl into my
> Netscape 4.7) is to keep reloading or to go to the Edit->Preferences->
> Advanced->Cache and swith "Every Time" on.
> 
> ...
> GET /cgi-perl/file_upload.pl HTTP/1.1
> 
> 

The currently missing 




might help the browser to figure out that the first page is over. Also, if
nothing helps, send an explicit no-cache in the header:

$r->content_type('text/html');
$r->header_out('Cache-control','no-cache');
$r->header_out('Pragma','no-cache');
$r->send_http_header;

- Gerd.

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Re: where can I get MIME/Head.pm modules

[Gerd Kortemeyer]

> zhang-sh wrote:

> Re: where can I get MIME/Head.pm  modules

www.cpan.org

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Re: newbie needs help

[Gerd Kortemeyer]

> $r->content_type("text/plain";

You are missing a ")" here. Check the error_log of Apache for errors like that.

- Gerd.

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Strange log entry, Apache child messed up afterwards

[Gerd Kortemeyer]

Hi,

Did anybody ever see a message like this in the error log after an "internal
server error"?

 [error] Undefined subroutine &Apache::lonhomework::handler called at /dev/null
line 65535.

No further entries.

lonhomework is the mod_perl handler attached to a URL, and is called directly.
This happens intermittently and seemingly at random; however, after this
happened once, that Apache child is messed up and will do this again and again
when hit - so depending on which child happens to answer, you get the correct
reply or another 500.

Distributions:

 Red Hat Linux release 6.2 (Zoot)
 Kernel 2.2.16-3smp on a 2-processor i686
 [www@s10 www]$ rpm -q mod_perl
 mod_perl-1.23-3
 [www@s10 www]$ rpm -q perl
 perl-5.00503-10
 [www@s10 www]$ rpm -q apache
 apache-1.3.14-2.6.2

Thanks to all in advance!

- Gerd.

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[Fwd: Registry scripts slower than handlers: Why?]

[Gerd Kortemeyer]

Jie Gao wrote:

>
> Registry scripts run slower according to the benchmark data here. Presuming
> both were preloaded at server startup, can anybody explain this slowness?

Slow is relative ... still a lot faster than vanilla cgi. But registry needs to
emulate a cgi-like environment before starting to work on the script itself (even
if it is preloaded) - there is extra overhead for providing a separate namespace,
etc. Inside of that environment, scripts can be pretty dirty - mod_perl-handlers
have to be written a lot cleaner than registry-cgi-scripts.

Quoting from http://perl.apache.org/dist/cgi_to_mod_perl.html:

> CGI lets you get away with sloppy programming, mod_perl does not. Why? CGI scripts 
>have the lifetime of a single HTTP
>  request as a separate process. When the request is over, the process goes away 
>and everything is cleaned up for you, e.g.
>  globals variables, open files, etc. Scripts running under mod_perl have a 
>longer lifetime, over several request, different
>  scripts may be in the same process. This means you must clean up after 
>yourself. You've heard: always 'use strict' and
>  -w!!!
>
>  It's more important under mod_perl Perl than anywhere else, while it's not 
>required, it strongly recommended, it will save
>  you more time in the long run. And, of course, clean scripts will still run 
>under CGI!
>

- Gerd.


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Looking for Higher Ed mod_perl'ers

[Gerd Kortemeyer]

Hi,

Anybody out there who is using mod_perl for online teaching and learning
applications in higher education? Looking for possible future collaborators on
an open source project, http://www.lite.msu.edu/kortemeyer/lon/ .

- Gerd.


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Re: redhat apache and modperl oh my!

[Gerd Kortemeyer]

Clay wrote:
> 
> so i am just wanting to know what anyone
> has found out on mod perl not working properly
> under redhat 6.1?

If you install everything (including modperl) from RedHat's RPMs, no problem (I
did this on five very different boxes, some new, some upgraded). If you try to
do it yourself by building from sources, etc, ... oh well - then RedHat is in
the way and gets all confused..

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Re: Eagle Book - mod_hello.c, hello.pl :)

[Gerd Kortemeyer]

Michael Dearman <[EMAIL PROTECTED]> wrote:

> I've come close to figuring this one out buy following some of the
> questions I've seen here. But...
>
> Hello $ENV{REMOTE_HOST}
>
> The remote host doesn't show. Printing out the %ENV, it tain't there.
> But where does Perl get it. From CGI.pm (which is installed) or where?

Stas Bekman wrote:

> This is an easy prove that %ENV is set (while not all variables are
> present as with mod_cgi, particularly REMOTE_HOST isn't there...)

To my knowledge, seems like all environment variables are present. We are
making extensive use of %ENV in our mod_perl content handlers - the $r's
subprocess environment is completely copied over to %ENV for the last stage of
the Apache request cycle (including additional session environment variables
you might have set along the way in your authentication handlers).

However, REMOTE_HOST is not even present for mod_cgi anymore, Apache changed
the way they handle that environment variable with Version 1.3, so that now it
is standards compliant and rather useless, see
http://www.apache.org/docs/upgrading_to_1_3.html


> REMOTE_HOST CGI variable changed. In Apache 1.2 and earlier, the REMOTE_HOST 
>environment variable made available to CGI scripts was set
>  to either the full DNS name of the client, or else to the client's IP address 
>if the name was not known. This behaviour differed from that specified by
>  the CGI specification, which defines this variable as being NULL if the name 
>isn't known. In Apache 1.3, we have made this correction.
>  REMOTE_ADDR always contains the client's IP address, but REMOTE_HOST is only 
>defined when the server has been able to determine the client's
>  DNS name.
>

I think that is what you are seeing, rather than any problem with the
environment in general.

- Gerd.



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mod_perl and Kerberos

[Gerd Kortemeyer]

Just wondering if anybody has used Kerberos authentication from inside a
mod_perl module - this is not just for "Basic Authentication", but the modules
would do some processing (for example look for internal authentication first)
before going out to Kerberos. Any hints on where to look for code samples?

- Gerd.


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Re: module for pushing?

[Gerd Kortemeyer]

Sebastian Ahrens wrote:

> Well exactly what I need here...
>
> Jim Serio schrieb:
>
> > Here's my problem
> >
> > We are in the process of delivering a Web Cast
> > and we would like to "control" the delivery of
> > pages to the browser. For example, let's say you
> > visit a Web Cast and you only need to load the
> > first page. Subsequent pages are automatically
> > pushed from the server. While is sounds like a
> > "meta refresh" solution, the time between
> > refreshes will vary. Is it possible to write
> > a Perl module to automatically push content which
> > is controlled via a CGI? I doubt it's possible on
> > the server side but my experience with server
> > push is limited so maybe some of you experts know.
> >
> > Jim

Not as an Apache module, since those are one-request-cycle-deals. For
server-push to work you have to keep the connection to the browser open and
send something like a multipart message with several installments, each of
them replacing the previous one. This, BTW, only works with Netscape, Exploder
does not support server-push. I have written a CGI-script for a chatroom that
way. Since it's CGI and not mod_perl, it's outside the scope of this group,
however, check out http://forum.swarthmore.edu/epigone/modperl/linbendphul and
http://forum.swarthmore.edu/epigone/modperl/gimyarzah .

- Gerd.


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