Mailing List Archive

virtualhosts with same Docroots steal Request object and Session
Dear list,
I have this scenario:
Two virtual servers ( A and B ) share the same DocumentRoot,
due to the fact that every server needs some special "global" variables,
each is set up with its own Perl interpreter.
The first Request to the page mypage.epl determinates which server has
the "right" Enviroment.
Subsequent Request to the same document from the other server shows that
not even the variable is "gone", but also the Embperl-Request and
therefore udat, mdat and fdat.

To make clear what happens:
httpd.conf:
MaxServers 1
<VirtualHost 12.34.56:8080>
Servername A
PerlOptions +Parent
PerlSwitches -Mlib=/webserver/A/lib
PerlRequire /webserver/A/lib/startup.pl
Embperl_Appname A-app
Embperl_Options 270338
Embperl_Cookie_Name "A_cookie"
DocumentRoot /webservers/htdocs
</VirtualHost>
<VirtualHost 12.34.56:80>
Servername B
PerlOptions +Parent
PerlSwitches -Mlib=/webserver/B/lib
PerlRequire /webserver/B/lib/startup.pl
Embperl_Appname B-app
Embperl_Options 270338
Embperl_Cookie_Name "B_cookie"
DocumentRoot /webservers/htdocs
</VirtualHost>

startup.pl:
use Some::Modul;
our $GLOBAL;
$GLOBAL = { key1 => A | B };

mypage.epl:
<html><pre>
outerTEXT
[.*
my $r = shift;
print OUT "TEST:\n";
print OUT Data::Dumper::Dumper( $::GLOBAL );
print OUT Data::Dumper::Dumper ( $r );
*]
<pre></html>

If I access mypage.epl through server A
http://A/mypage.epl, I got the following ( expected ) result:
outerTEXT
TEST:
$VAR1 = {
'key1' => A
};

$VAR1 = bless( {}, 'Embperl::Req' );

If I call http://B/mypage.epl, I get :
outerTEXT

Not even the static "TEST" ist printed, neither the expected "key1 => B"
Attempts to set $udat{'somekey} fail because "Can't call method "init"
on unblessed reference at
/usr/lib/perl5/site_perl/5.8.5/Apache/SessionX.pm" and in fact is $self
in SessionX.pm undef.
Attemps to access $r->app fail, because of "Can't call method "app" on
an undefined value".

If I force a recompile of the page and access it at first from server B
everything is the other way round.

I expected each virtual host to have a global variable called $::GLOBAL
and %udat and $r to behave "normal" because, the not only have their own
Perlinterpreters but also different Embperl_Appnames and even the cookie
name ist different, so that their should be IMHO no interference.

What am I missing here?
Any hint is welcome.
thanks in advance


frank

--
mit freundlichem Gruß,

Frank Wesemann
Fotofinder GmbH USt-IdNr. DE812854514
Software Entwicklung Web: http://www.fotofinder.net/
Potsdamer Str. 96 Tel: +49 30 25 79 28 90
10785 Berlin Fax: +49 30 25 79 28 999

Sitz: Berlin
Amtsgericht Berlin Charlottenburg (HRB 73099)
Geschäftsführer: Ali Paczensky




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Re: virtualhosts with same Docroots steal Request object and Session [ In reply to ]
I am very sorry,
I forgot to supply the credentials:
It is Embperl 2.2.0 with an
Apache 2.0.52 ( preforking )
Perl is 5.8.5
all that running under RedHat 3.4.6-3

--
mit freundlichem Gruß,

Frank Wesemann
Fotofinder GmbH USt-IdNr. DE812854514
Software Entwicklung Web: http://www.fotofinder.net/
Potsdamer Str. 96 Tel: +49 30 25 79 28 90
10785 Berlin Fax: +49 30 25 79 28 999

Sitz: Berlin
Amtsgericht Berlin Charlottenburg (HRB 73099)
Geschäftsführer: Ali Paczensky




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RE: virtualhosts with same Docroots steal Request object and Session [ In reply to ]
Hi,

> I have this scenario:
> Two virtual servers ( A and B ) share the same DocumentRoot,
> due to the fact that every server needs some special "global"
> variables, each is set up with its own Perl interpreter.
> The first Request to the page mypage.epl determinates which
> server has the "right" Enviroment.
> Subsequent Request to the same document from the other server
> shows that not even the variable is "gone", but also the
> Embperl-Request and therefore udat, mdat and fdat.
>

I guess the problem is that Embperl is not aware of these two Perl
interpreters. There are some structures that are process global inside
of Embperl (even it is designed to support multiple interpreteres and
threads, it's not done yet).

I would suggest to just run two instances of Apache. Since Perl is what
takes up the memory, it will not make much difference to have two Apache
instance or having two Perl interpreter inside one Apache instance (at
least as long as the prefork mpm is used)

Gerald



> To make clear what happens:
> httpd.conf:
> MaxServers 1
> <VirtualHost 12.34.56:8080>
> Servername A
> PerlOptions +Parent
> PerlSwitches -Mlib=/webserver/A/lib
> PerlRequire /webserver/A/lib/startup.pl
> Embperl_Appname A-app
> Embperl_Options 270338
> Embperl_Cookie_Name "A_cookie"
> DocumentRoot /webservers/htdocs
> </VirtualHost>
> <VirtualHost 12.34.56:80>
> Servername B
> PerlOptions +Parent
> PerlSwitches -Mlib=/webserver/B/lib
> PerlRequire /webserver/B/lib/startup.pl
> Embperl_Appname B-app
> Embperl_Options 270338
> Embperl_Cookie_Name "B_cookie"
> DocumentRoot /webservers/htdocs
> </VirtualHost>
>
> startup.pl:
> use Some::Modul;
> our $GLOBAL;
> $GLOBAL = { key1 => A | B };
>
> mypage.epl:
> <html><pre>
> outerTEXT
> [.*
> my $r = shift;
> print OUT "TEST:\n";
> print OUT Data::Dumper::Dumper( $::GLOBAL ); print OUT
> Data::Dumper::Dumper ( $r ); *] <pre></html>
>
> If I access mypage.epl through server A
> http://A/mypage.epl, I got the following ( expected ) result:
> outerTEXT
> TEST:
> $VAR1 = {
> 'key1' => A
> };
>
> $VAR1 = bless( {}, 'Embperl::Req' );
>
> If I call http://B/mypage.epl, I get :
> outerTEXT
>
> Not even the static "TEST" ist printed, neither the expected
> "key1 => B"
> Attempts to set $udat{'somekey} fail because "Can't call
> method "init"
> on unblessed reference at
> /usr/lib/perl5/site_perl/5.8.5/Apache/SessionX.pm" and in
> fact is $self in SessionX.pm undef.
> Attemps to access $r->app fail, because of "Can't call
> method "app" on an undefined value".
>
> If I force a recompile of the page and access it at first
> from server B everything is the other way round.
>
> I expected each virtual host to have a global variable called
> $::GLOBAL and %udat and $r to behave "normal" because, the
> not only have their own Perlinterpreters but also different
> Embperl_Appnames and even the cookie name ist different, so
> that their should be IMHO no interference.
>
> What am I missing here?
> Any hint is welcome.
> thanks in advance
>
>
> frank
>
> --
> mit freundlichem Gruß,
>
> Frank Wesemann
> Fotofinder GmbH USt-IdNr. DE812854514
> Software Entwicklung Web: http://www.fotofinder.net/
> Potsdamer Str. 96 Tel: +49 30 25 79 28 90
> 10785 Berlin Fax: +49 30 25 79 28 999
>
> Sitz: Berlin
> Amtsgericht Berlin Charlottenburg (HRB 73099)
> Geschäftsführer: Ali Paczensky
>
>
>
>
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> To unsubscribe, e-mail: embperl-unsubscribe@perl.apache.org
> For additional commands, e-mail: embperl-help@perl.apache.org
>
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