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Posted to modperl@perl.apache.org by xyon <xy...@indigorobot.com> on 2008/03/13 00:02:27 UTC

Custom Object-Oriented Module using HTML::Template

Hey everyone,

Firstly, I apologize I sent the previous email under an incorrect subject line.

I am working on my first Object-Oriented project, and have hit a slight
snag. I am using HTML::Template to output within the View module, but it
never outputs. I don't see any errors in the logs, I just get a blank
page. Below is pertinent information including a test script with its
output:



OS Info:
----------------------------------------------------
CentOS release 4.6 (Final)
----------------------------------------------------



Package info:
----------------------------------------------------
perl-5.8.8-11
perl-HTML-Template-2.9-1
httpd-2.0.59-1.el4s1.10.el4.centos
mod_perl-2.0.3-1.el4s1.3
----------------------------------------------------



/home/perl/Myserver/View.pm
----------------------------------------------------
package Myserver::View;

#Setup some essentials
use strict;         #strict tolerance for code
use Carp;           #debugging
use diagnostics;    #more debugging
use warnings;       #more debugging

#Loadup some needed functions
use HTML::Template;

sub new {
    my $self        = shift;
    return $self;
}

sub mainpage {
    my $self        = shift;
    my $template    = HTML::Template->new( filename =>
'/home/Perl/tmpl/mainpage.tmpl',
            cache => 1,
            debug => 1, 
            stack_debug => 1 );
    print "Content-Type: text/html\n\n";
    $template->output;
    return $self;
}

1;
----------------------------------------------------



/home/Perl/tests/View_mainpage.pl
----------------------------------------------------
#!/usr/bin/perl -w

# Test printing of the main page
print "Main Page..";

#Let's load the view module
use lib "../";
use Myserver::View;
#Now let's load some things that are very handy
use strict;         #strict tolerance for code
use Carp;           #debugging
use warnings;       #more debugging
use diagnostics;    #even more debugging

# Let's create an object
my $view        = Myserver::View->new;

# Now, let's tell View to display the main page
$view->mainpage;

print ".OK";

1;
----------------------------------------------------



/home/Perl/tmpl/mainpage.tmpl:
----------------------------------------------------
<html><body bgcolor="#FF00FF">Test!</body></html>
----------------------------------------------------



Output with debugging on (as above):
----------------------------------------------------
$ tests/View_mainpage.pl 
### HTML::Template Debug ### In _parse:
### HTML::Template _param Stack Dump ###

$VAR1 = [
          \'<html><body bgcolor="#FF00FF">Test!</body></html>
'
        ];

Main Page..Content-Type: text/html

### HTML::Template Debug ### In output
### HTML::Template output Stack Dump ###

$VAR1 = [
          \'<html><body bgcolor="#FF00FF">Test!</body></html>
'
        ];

.OK
----------------------------------------------------



Output without debugging:
----------------------------------------------------
$ tests/View_mainpage.pl 
Main Page..Content-Type: text/html

.OK
----------------------------------------------------




-- 
xyon <xy...@indigorobot.com>

Re: Custom Object-Oriented Module using HTML::Template

Posted by André Warnier <aw...@ice-sa.com>.

Hi.

I know it's not clean, and it is probably not what you need to do in the 
long run, and I don't know a bit about HTML::Template.
But why don't you try the following, just to check :

 >>>>> package Myserver::Handler;
 >>>>>
 >>>>> #Setup some essentials
 >>>>> use strict;         #strict tolerance for code
 >>>>> use Carp;           #debugging
 >>>>> use diagnostics;    #more debugging
 >>>>> use warnings;       #more debugging

 >>>>> #Handler-related stuff
 >>>>> use Apache2::RequestRec ();
 >>>>> use Apache2::RequestIO ();
 >>>>> use Apache2::Const -compile => qw(OK);

 >>>>> use HTML::Template;

 >>>>>
 >>>>> sub handler {
 >>>>>     my $self        = shift;
 >>>>>     $self->content_type('text/html');
 >>>>>
 >>>>>     my $template    = HTML::Template->new(
 >>>>> 		filename => '/home/Perl/tmpl/mainpage.tmpl',
 >>>>>                 cache => 1,
 >>>>>                 debug => 1,
 >>>>>                 stack_debug => 1 );

 >>>>>     print $template->output;
 >>>>>
 >>>>>     # Obligatory stuff for the handler
 >>>>>     return Apache2::Const::OK;
 >>>>>
 >>>>> }

André

xyon wrote:
> Good suggestion, I moved the content_type to the top of the handler
> routine in Handler.pm, so it now looks like:
> 
> -------------------------------------------------------------------
> sub handler {
>     my $self        = shift;
>     $self->content_type('text/html');
>     
>     my $view        = Myserver::View->new();
>     $view->mainpage;
> 
>     # Obligatory stuff for the handler
>     return Apache2::Const::OK;
> }
> -------------------------------------------------------------------
> 
> 
> 
> I am still getting a blank page, though. Here is the latest lwp-request
> output:
> 
> 
> -------------------------------------------------------------------
> $ lwp-request -s -U -S -e -m GET "http://localhost/admin/"
> GET http://localhost/admin/
> User-Agent: lwp-request/2.07
> 
> GET http://localhost/admin/ --> 200 OK
> Connection: close
> Date: Thu, 13 Mar 2008 15:45:08 GMT
> Server: Apache
> Content-Length: 0
> Content-Type: text/html; charset=UTF-8
> Client-Date: Thu, 13 Mar 2008 15:45:09 GMT
> Client-Peer: 127.0.0.1:80
> Client-Response-Num: 1
> -------------------------------------------------------------------
> 
> 
> 
> On Thu, 2008-03-13 at 16:38 +0100, André Warnier wrote:
>> Hi.
>>
>> First, don't take my suggestions as gospel, I don't know the TT2 and do 
>> not really know how you're supposed to work with it.
>> But it seems to me that this is in the wrong order :
>>
>>      $view->mainpage;
>>      $self->content_type('text/html');
>>
>> I think you should trigger the HTTP header before you generate the 
>> content.  Now, whether that is the reason of your current problem or 
>> not, I haven't a clue.
>>
>> But I'm trying, and I'm really interested, because I am starting to want 
>> to know more about TT2 (and Catalyst) these days.  So your 
>> "from-the-very beginning" approach is also very helpful to me.
>> (And I do have a certain experience of Apache2/mod_perl2)
>>
>> And, re-check your lwp-request switches, you might have disabled the 
>> display of the response content (remove the -d).
>>
>> André
>>
>>
>>
>> xyon wrote:
>>> Thanks for the reply.
>>>
>>> I thought as you did (that there were too many "Content-Type"
>>> definitions), so commented out this line in the View.pm module, but that
>>> doesn't seem to have changed anything:
>>>
>>> 'print "Content-Type: text/html\n\n";'
>>>
>>>
>>>
>>>
>>> Here is the lwp command and output:
>>> -------------------------------------------------------------------
>>> $ lwp-request -e -S -s -U -m GET -Sed "http://localhost/admin/"
>>> GET http://localhost/admin/
>>> User-Agent: lwp-request/2.07
>>>
>>> GET http://localhost/admin/ --> 200 OK
>>> Connection: close
>>> Date: Thu, 13 Mar 2008 15:24:23 GMT
>>> Server: Apache
>>> Content-Length: 0
>>> Content-Type: text/html; charset=UTF-8
>>> Client-Date: Thu, 13 Mar 2008 15:24:23 GMT
>>> Client-Peer: 127.0.0.1:80
>>> Client-Response-Num: 1
>>> -------------------------------------------------------------------
>>>
>>>
>>> On Thu, 2008-03-13 at 16:11 +0100, André Warnier wrote:
>>>> Hi.
>>>>
>>>> First, a small disgression : along with perl, comes a beautiful test 
>>>> tool for HTTP stuff, called "lwp-request".
>>>> Like, at the command-line :
>>>> lwp-request  (to see the options)
>>>> lwp-request -m GET -Sed "http://myserver/myURL"
>>>> (that will show you what you get as a response, without a browser 
>>>> getting in the way)
>>>>
>>>> Then, below, are you not now sending one "Content-type" too many ?
>>>> It looks like you are doing it once in handler(), and once in mainpage().
>>>>
>>>> André
>>>>
>>>> xyon wrote:
>>>>> That worked great with the test script ( print $template->output; ), but
>>>>> unfortunately, I'm having trouble getting the display onto a web page
>>>>> (via the Handler). The resulting web page is blank, with no source.
>>>>>
>>>>>
>>>>> Below are my Apache configs for the handler, logs, and the handler and
>>>>> view module's latest code. I've also included the test script code, just
>>>>> in case there is some obvious reason it would work and the handler
>>>>> won't.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Apache config:
>>>>> ----------------------------------------------------
>>>>> PerlRequire /etc/httpd/perl/startup.pl
>>>>> <Location /admin>
>>>>>     SetHandler modperl 
>>>>>     PerlResponseHandler Myserver::Handler
>>>>> </Location>
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> /etc/httpd/perl/startup.pl:
>>>>> ----------------------------------------------------
>>>>> use lib qw(/home/Perl/);
>>>>> 1;
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Apache log:
>>>>> ----------------------------------------------------
>>>>> ==> /var/log/httpd/error_log <==
>>>>> ### HTML::Template Debug ### In _parse:
>>>>> ### HTML::Template _param Stack Dump ###
>>>>>
>>>>> $VAR1 = [
>>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
>>>>> '
>>>>>         ];
>>>>>
>>>>> ### HTML::Template Debug ### In output
>>>>> ### HTML::Template output Stack Dump ###
>>>>>
>>>>> $VAR1 = [
>>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
>>>>> '
>>>>>         ];
>>>>>
>>>>>
>>>>> ==> /var/log/httpd/ssl_request_log <==
>>>>> [13/Mar/2008:10:48:38 -0400] 10.5.5.5 TLSv1 DHE-RSA-AES256-SHA
>>>>> "GET /admin/ HTTP/1.1" -
>>>>>
>>>>> ==> /var/log/httpd/ssl_access_log <==
>>>>> 10.5.5.5 - - [13/Mar/2008:10:48:38 -0400] "GET /admin/ HTTP/1.1" 200 -
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> /home/Perl/Myserver/Handler.pm
>>>>> ----------------------------------------------------
>>>>> package Myserver::Handler;
>>>>>
>>>>> #Setup some essentials
>>>>> use strict;         #strict tolerance for code
>>>>> use Carp;           #debugging
>>>>> use diagnostics;    #more debugging
>>>>> use warnings;       #more debugging
>>>>>
>>>>> #Handler-related stuff
>>>>> use Apache2::RequestRec ();
>>>>> use Apache2::RequestIO ();
>>>>> use Apache2::Const -compile => qw(OK);
>>>>>
>>>>> sub handler {
>>>>>     my $self        = shift;
>>>>>     
>>>>>     my $view        = Myserver::View->new();
>>>>>     $view->mainpage;
>>>>>
>>>>>     # Obligatory stuff for the handler
>>>>>     $self->content_type('text/html');
>>>>>     return Apache2::Const::OK;
>>>>>
>>>>> }
>>>>>
>>>>> 1;
>>>>>
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> /home/Perl/Myserver/View.pm:
>>>>> ----------------------------------------------------
>>>>> package Myserver::View;
>>>>>
>>>>> #Setup some essentials
>>>>> use strict;         #strict tolerance for code
>>>>> use Carp;           #debugging
>>>>> use diagnostics;    #more debugging
>>>>> use warnings;       #more debugging
>>>>>
>>>>> #Loadup some needed functions
>>>>> use HTML::Template;
>>>>>
>>>>> sub new {
>>>>>     my $self        = shift;
>>>>>     return $self;
>>>>> }
>>>>>
>>>>> sub mainpage {
>>>>>     my $self        = shift;
>>>>>     my $template    = HTML::Template->new(
>>>>> 		filename => '/home/Perl/tmpl/mainpage.tmpl',
>>>>>                 cache => 1,
>>>>>                 debug => 1,
>>>>>                 stack_debug => 1 );
>>>>>     print "Content-Type: text/html\n\n";
>>>>>     print $template->output;
>>>>>     return $self;
>>>>> }
>>>>>
>>>>> 1;
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> /home/Perl/tmpl/mainpage.tmpl:
>>>>> ----------------------------------------------------
>>>>> <html><body bgcolor="#FF00FF">Test!</body></html>
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> /home/Perl/tests/View_mainpage.pl
>>>>> ----------------------------------------------------
>>>>> #!/usr/bin/perl -w
>>>>>
>>>>> # Test printing of the main page
>>>>> print "Main Page..";
>>>>>
>>>>> #Let's load the view module
>>>>> use lib "../";
>>>>> use Myserver::View;
>>>>> #Now let's load some things that are very handy
>>>>> use strict;         #strict tolerance for code
>>>>> use Carp;           #debugging
>>>>> use warnings;       #more debugging
>>>>> use diagnostics;    #even more debugging
>>>>>
>>>>> # Let's create an object
>>>>> my $view        = Myserver::View->new;
>>>>>
>>>>> # Now, let's tell View to display the main page
>>>>> $view->mainpage;
>>>>>
>>>>> print ".OK";
>>>>>
>>>>> 1;
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Thu, 2008-03-13 at 13:29 +0800, Foo JH wrote:
>>>>>> try print $template->output;
>>>>>>
>>>>>> You forgot the print();
>>>>>>
>>>>>> xyon wrote:
>>>>>>> Hey everyone,
>>>>>>>
>>>>>>> Firstly, I apologize I sent the previous email under an incorrect subject line.
>>>>>>>
>>>>>>> I am working on my first Object-Oriented project, and have hit a slight
>>>>>>> snag. I am using HTML::Template to output within the View module, but it
>>>>>>> never outputs. I don't see any errors in the logs, I just get a blank
>>>>>>> page. Below is pertinent information including a test script with its
>>>>>>> output:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> OS Info:
>>>>>>> ----------------------------------------------------
>>>>>>> CentOS release 4.6 (Final)
>>>>>>> ----------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Package info:
>>>>>>> ----------------------------------------------------
>>>>>>> perl-5.8.8-11
>>>>>>> perl-HTML-Template-2.9-1
>>>>>>> httpd-2.0.59-1.el4s1.10.el4.centos
>>>>>>> mod_perl-2.0.3-1.el4s1.3
>>>>>>> ----------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> /home/perl/Myserver/View.pm
>>>>>>> ----------------------------------------------------
>>>>>>> package Myserver::View;
>>>>>>>
>>>>>>> #Setup some essentials
>>>>>>> use strict;         #strict tolerance for code
>>>>>>> use Carp;           #debugging
>>>>>>> use diagnostics;    #more debugging
>>>>>>> use warnings;       #more debugging
>>>>>>>
>>>>>>> #Loadup some needed functions
>>>>>>> use HTML::Template;
>>>>>>>
>>>>>>> sub new {
>>>>>>>     my $self        = shift;
>>>>>>>     return $self;
>>>>>>> }
>>>>>>>
>>>>>>> sub mainpage {
>>>>>>>     my $self        = shift;
>>>>>>>     my $template    = HTML::Template->new( filename =>
>>>>>>> '/home/Perl/tmpl/mainpage.tmpl',
>>>>>>>             cache => 1,
>>>>>>>             debug => 1, 
>>>>>>>             stack_debug => 1 );
>>>>>>>     print "Content-Type: text/html\n\n";
>>>>>>>     $template->output;
>>>>>>>     return $self;
>>>>>>> }
>>>>>>>
>>>>>>> 1;
>>>>>>> ----------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> /home/Perl/tests/View_mainpage.pl
>>>>>>> ----------------------------------------------------
>>>>>>> #!/usr/bin/perl -w
>>>>>>>
>>>>>>> # Test printing of the main page
>>>>>>> print "Main Page..";
>>>>>>>
>>>>>>> #Let's load the view module
>>>>>>> use lib "../";
>>>>>>> use Myserver::View;
>>>>>>> #Now let's load some things that are very handy
>>>>>>> use strict;         #strict tolerance for code
>>>>>>> use Carp;           #debugging
>>>>>>> use warnings;       #more debugging
>>>>>>> use diagnostics;    #even more debugging
>>>>>>>
>>>>>>> # Let's create an object
>>>>>>> my $view        = Myserver::View->new;
>>>>>>>
>>>>>>> # Now, let's tell View to display the main page
>>>>>>> $view->mainpage;
>>>>>>>
>>>>>>> print ".OK";
>>>>>>>
>>>>>>> 1;
>>>>>>> ----------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> /home/Perl/tmpl/mainpage.tmpl:
>>>>>>> ----------------------------------------------------
>>>>>>> <html><body bgcolor="#FF00FF">Test!</body></html>
>>>>>>> ----------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Output with debugging on (as above):
>>>>>>> ----------------------------------------------------
>>>>>>> $ tests/View_mainpage.pl 
>>>>>>> ### HTML::Template Debug ### In _parse:
>>>>>>> ### HTML::Template _param Stack Dump ###
>>>>>>>
>>>>>>> $VAR1 = [
>>>>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
>>>>>>> '
>>>>>>>         ];
>>>>>>>
>>>>>>> Main Page..Content-Type: text/html
>>>>>>>
>>>>>>> ### HTML::Template Debug ### In output
>>>>>>> ### HTML::Template output Stack Dump ###
>>>>>>>
>>>>>>> $VAR1 = [
>>>>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
>>>>>>> '
>>>>>>>         ];
>>>>>>>
>>>>>>> .OK
>>>>>>> ----------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Output without debugging:
>>>>>>> ----------------------------------------------------
>>>>>>> $ tests/View_mainpage.pl 
>>>>>>> Main Page..Content-Type: text/html
>>>>>>>
>>>>>>> .OK
>>>>>>> ----------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>   
>>>
> 
>

RE: Custom Object-Oriented Module using HTML::Template

Posted by xyon <xy...@indigorobot.com>.

FYI, for those interested, I had to do some code adjustments. There was
a missing right curly bracket in Handler.pm (need to close the sub), and
I wasn't loading DECLINED properly in Handler.pm. Here is the proper
setup:

-------------------------------------------------------------------
package Myserver::Handler;

#Setup some essentials
use strict;         #strict tolerance for code
use Carp;           #debugging
use diagnostics;    #more debugging
use warnings;       #more debugging

#Handler-related stuff
use Apache2::RequestRec ();
use Apache2::RequestIO ();
use Apache2::Const -compile => qw(OK DECLINED);
#Loadup Apache2::Request so we know what's been passed to us
use Apache2::Request;
#Loadup the Main (Model) and View modules (staying true to the
#Model/View/Control (MVC) (We are, Handler, or Control)) 
use lib "../";
use Myserver::Main;
use Myserver::View;

sub handler {
    # We are an instance method
    my $request = shift;

    my $view    = Myserver::View->new();
    if (my $output  = $view->mainpage()) {
        $request->content_type('text/html');
        $request->print($output);
        return Apache2::Const::OK;
    } else {
        return Apache2::Const::DECLINED;
    };
}

1;
-------------------------------------------------------------------


On Thu, 2008-03-13 at 16:32 +0000, xyon wrote:
> Thank you all for your advice. With that and some help from a mentor, it
> is now working, with the below code:
> 
> 
> Apache config:
> -------------------------------------------------------------------
> PerlSwitches -I/home/Perl/
> PerlModule Myserver::Handler
> <Location /admin>
>     SetHandler modperl 
>     PerlResponseHandler Myserver::Handler
> </Location>
> -------------------------------------------------------------------
> 
> 
> 
> 
> Handler.pm:
> -------------------------------------------------------------------
> sub handler {
>     my $request = shift;
> 
>     my $view    = Myserver::View->new();
>     if (my $output  = $view->mainpage()) {
>         $request->content_type('text/html');
>         $request->print($output);
>         return Apache2::Const::OK;
>     } else {
>         return Apache2::Const::Declined;
>     };
>     
> 1;
> 
> -------------------------------------------------------------------
> 
> 
> 
> 
> View.pm
> -------------------------------------------------------------------
> sub new {
>     my $class       = shift;
>     my $self        = {};
>     return bless $self, $class;
> }
> 
> sub mainpage {
>     my $self        = shift;
>     my $template    = HTML::Template->new( 
>                 filename => '/home/Perl/tmpl/mainpage.tmpl',
>                 cache => 1,
>                 debug => 1, 
>                 stack_debug => 1 );
>     return $template->output;
> }
> 
> 1;
> -------------------------------------------------------------------
> 
> 
> 
> 
> On Thu, 2008-03-13 at 12:01 -0400, Adam Prime x443 wrote:
> > SetHandler modperl doesn't bind 'print' to '$r->print'.  Try SetHandler perl-script, or change your code to pass in the request object and use $r->print instead of print.
> > 
> > Adam
> > 
> > -----Original Message-----
> > From: xyon [mailto:xyon@indigorobot.com]
> > Sent: Thursday, March 13, 2008 11:47 AM
> > To: modperl
> > Subject: Re: Custom Object-Oriented Module using HTML::Template
> > 
> > Good suggestion, I moved the content_type to the top of the handler
> > routine in Handler.pm, so it now looks like:
> > 
> > -------------------------------------------------------------------
> > sub handler {
> >     my $self        = shift;
> >     $self->content_type('text/html');
> > 
> >     my $view        = Myserver::View->new();
> >     $view->mainpage;
> > 
> >     # Obligatory stuff for the handler
> >     return Apache2::Const::OK;
> > }
> > -------------------------------------------------------------------
> > 
> > 
> > 
> > I am still getting a blank page, though. Here is the latest lwp-request
> > output:
> > 
> > 
> > -------------------------------------------------------------------
> > $ lwp-request -s -U -S -e -m GET "http://localhost/admin/"
> > GET http://localhost/admin/
> > User-Agent: lwp-request/2.07
> > 
> > GET http://localhost/admin/ --> 200 OK
> > Connection: close
> > Date: Thu, 13 Mar 2008 15:45:08 GMT
> > Server: Apache
> > Content-Length: 0
> > Content-Type: text/html; charset=UTF-8
> > Client-Date: Thu, 13 Mar 2008 15:45:09 GMT
> > Client-Peer: 127.0.0.1:80
> > Client-Response-Num: 1
> > -------------------------------------------------------------------
> > 
> > 
> > 
> > On Thu, 2008-03-13 at 16:38 +0100, André Warnier wrote:
> > > Hi.
> > >
> > > First, don't take my suggestions as gospel, I don't know the TT2 and do
> > > not really know how you're supposed to work with it.
> > > But it seems to me that this is in the wrong order :
> > >
> > >      $view->mainpage;
> > >      $self->content_type('text/html');
> > >
> > > I think you should trigger the HTTP header before you generate the
> > > content.  Now, whether that is the reason of your current problem or
> > > not, I haven't a clue.
> > >
> > > But I'm trying, and I'm really interested, because I am starting to want
> > > to know more about TT2 (and Catalyst) these days.  So your
> > > "from-the-very beginning" approach is also very helpful to me.
> > > (And I do have a certain experience of Apache2/mod_perl2)
> > >
> > > And, re-check your lwp-request switches, you might have disabled the
> > > display of the response content (remove the -d).
> > >
> > > André
> > >
> > >
> > >
> > > xyon wrote:
> > > > Thanks for the reply.
> > > >
> > > > I thought as you did (that there were too many "Content-Type"
> > > > definitions), so commented out this line in the View.pm module, but that
> > > > doesn't seem to have changed anything:
> > > >
> > > > 'print "Content-Type: text/html\n\n";'
> > > >
> > > >
> > > >
> > > >
> > > > Here is the lwp command and output:
> > > > -------------------------------------------------------------------
> > > > $ lwp-request -e -S -s -U -m GET -Sed "http://localhost/admin/"
> > > > GET http://localhost/admin/
> > > > User-Agent: lwp-request/2.07
> > > >
> > > > GET http://localhost/admin/ --> 200 OK
> > > > Connection: close
> > > > Date: Thu, 13 Mar 2008 15:24:23 GMT
> > > > Server: Apache
> > > > Content-Length: 0
> > > > Content-Type: text/html; charset=UTF-8
> > > > Client-Date: Thu, 13 Mar 2008 15:24:23 GMT
> > > > Client-Peer: 127.0.0.1:80
> > > > Client-Response-Num: 1
> > > > -------------------------------------------------------------------
> > > >
> > > >
> > > > On Thu, 2008-03-13 at 16:11 +0100, André Warnier wrote:
> > > >> Hi.
> > > >>
> > > >> First, a small disgression : along with perl, comes a beautiful test
> > > >> tool for HTTP stuff, called "lwp-request".
> > > >> Like, at the command-line :
> > > >> lwp-request  (to see the options)
> > > >> lwp-request -m GET -Sed "http://myserver/myURL"
> > > >> (that will show you what you get as a response, without a browser
> > > >> getting in the way)
> > > >>
> > > >> Then, below, are you not now sending one "Content-type" too many ?
> > > >> It looks like you are doing it once in handler(), and once in mainpage().
> > > >>
> > > >> André
> > > >>
> > > >> xyon wrote:
> > > >>> That worked great with the test script ( print $template->output; ), but
> > > >>> unfortunately, I'm having trouble getting the display onto a web page
> > > >>> (via the Handler). The resulting web page is blank, with no source.
> > > >>>
> > > >>>
> > > >>> Below are my Apache configs for the handler, logs, and the handler and
> > > >>> view module's latest code. I've also included the test script code, just
> > > >>> in case there is some obvious reason it would work and the handler
> > > >>> won't.
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>> Apache config:
> > > >>> ----------------------------------------------------
> > > >>> PerlRequire /etc/httpd/perl/startup.pl
> > > >>> <Location /admin>
> > > >>>     SetHandler modperl
> > > >>>     PerlResponseHandler Myserver::Handler
> > > >>> </Location>
> > > >>> ----------------------------------------------------
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>> /etc/httpd/perl/startup.pl:
> > > >>> ----------------------------------------------------
> > > >>> use lib qw(/home/Perl/);
> > > >>> 1;
> > > >>> ----------------------------------------------------
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>> Apache log:
> > > >>> ----------------------------------------------------
> > > >>> ==> /var/log/httpd/error_log <==
> > > >>> ### HTML::Template Debug ### In _parse:
> > > >>> ### HTML::Template _param Stack Dump ###
> > > >>>
> > > >>> $VAR1 = [
> > > >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > > >>> '
> > > >>>         ];
> > > >>>
> > > >>> ### HTML::Template Debug ### In output
> > > >>> ### HTML::Template output Stack Dump ###
> > > >>>
> > > >>> $VAR1 = [
> > > >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > > >>> '
> > > >>>         ];
> > > >>>
> > > >>>
> > > >>> ==> /var/log/httpd/ssl_request_log <==
> > > >>> [13/Mar/2008:10:48:38 -0400] 10.5.5.5 TLSv1 DHE-RSA-AES256-SHA
> > > >>> "GET /admin/ HTTP/1.1" -
> > > >>>
> > > >>> ==> /var/log/httpd/ssl_access_log <==
> > > >>> 10.5.5.5 - - [13/Mar/2008:10:48:38 -0400] "GET /admin/ HTTP/1.1" 200 -
> > > >>> ----------------------------------------------------
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>> /home/Perl/Myserver/Handler.pm
> > > >>> ----------------------------------------------------
> > > >>> package Myserver::Handler;
> > > >>>
> > > >>> #Setup some essentials
> > > >>> use strict;         #strict tolerance for code
> > > >>> use Carp;           #debugging
> > > >>> use diagnostics;    #more debugging
> > > >>> use warnings;       #more debugging
> > > >>>
> > > >>> #Handler-related stuff
> > > >>> use Apache2::RequestRec ();
> > > >>> use Apache2::RequestIO ();
> > > >>> use Apache2::Const -compile => qw(OK);
> > > >>>
> > > >>> sub handler {
> > > >>>     my $self        = shift;
> > > >>>
> > > >>>     my $view        = Myserver::View->new();
> > > >>>     $view->mainpage;
> > > >>>
> > > >>>     # Obligatory stuff for the handler
> > > >>>     $self->content_type('text/html');
> > > >>>     return Apache2::Const::OK;
> > > >>>
> > > >>> }
> > > >>>
> > > >>> 1;
> > > >>>
> > > >>> ----------------------------------------------------
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>> /home/Perl/Myserver/View.pm:
> > > >>> ----------------------------------------------------
> > > >>> package Myserver::View;
> > > >>>
> > > >>> #Setup some essentials
> > > >>> use strict;         #strict tolerance for code
> > > >>> use Carp;           #debugging
> > > >>> use diagnostics;    #more debugging
> > > >>> use warnings;       #more debugging
> > > >>>
> > > >>> #Loadup some needed functions
> > > >>> use HTML::Template;
> > > >>>
> > > >>> sub new {
> > > >>>     my $self        = shift;
> > > >>>     return $self;
> > > >>> }
> > > >>>
> > > >>> sub mainpage {
> > > >>>     my $self        = shift;
> > > >>>     my $template    = HTML::Template->new(
> > > >>>           filename => '/home/Perl/tmpl/mainpage.tmpl',
> > > >>>                 cache => 1,
> > > >>>                 debug => 1,
> > > >>>                 stack_debug => 1 );
> > > >>>     print "Content-Type: text/html\n\n";
> > > >>>     print $template->output;
> > > >>>     return $self;
> > > >>> }
> > > >>>
> > > >>> 1;
> > > >>> ----------------------------------------------------
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>> /home/Perl/tmpl/mainpage.tmpl:
> > > >>> ----------------------------------------------------
> > > >>> <html><body bgcolor="#FF00FF">Test!</body></html>
> > > >>> ----------------------------------------------------
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>> /home/Perl/tests/View_mainpage.pl
> > > >>> ----------------------------------------------------
> > > >>> #!/usr/bin/perl -w
> > > >>>
> > > >>> # Test printing of the main page
> > > >>> print "Main Page..";
> > > >>>
> > > >>> #Let's load the view module
> > > >>> use lib "../";
> > > >>> use Myserver::View;
> > > >>> #Now let's load some things that are very handy
> > > >>> use strict;         #strict tolerance for code
> > > >>> use Carp;           #debugging
> > > >>> use warnings;       #more debugging
> > > >>> use diagnostics;    #even more debugging
> > > >>>
> > > >>> # Let's create an object
> > > >>> my $view        = Myserver::View->new;
> > > >>>
> > > >>> # Now, let's tell View to display the main page
> > > >>> $view->mainpage;
> > > >>>
> > > >>> print ".OK";
> > > >>>
> > > >>> 1;
> > > >>> ----------------------------------------------------
> > > >>>
> > > >>>
> > > >>>
> > > >>>
> > > >>> On Thu, 2008-03-13 at 13:29 +0800, Foo JH wrote:
> > > >>>> try print $template->output;
> > > >>>>
> > > >>>> You forgot the print();
> > > >>>>
> > > >>>> xyon wrote:
> > > >>>>> Hey everyone,
> > > >>>>>
> > > >>>>> Firstly, I apologize I sent the previous email under an incorrect subject line.
> > > >>>>>
> > > >>>>> I am working on my first Object-Oriented project, and have hit a slight
> > > >>>>> snag. I am using HTML::Template to output within the View module, but it
> > > >>>>> never outputs. I don't see any errors in the logs, I just get a blank
> > > >>>>> page. Below is pertinent information including a test script with its
> > > >>>>> output:
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>> OS Info:
> > > >>>>> ----------------------------------------------------
> > > >>>>> CentOS release 4.6 (Final)
> > > >>>>> ----------------------------------------------------
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>> Package info:
> > > >>>>> ----------------------------------------------------
> > > >>>>> perl-5.8.8-11
> > > >>>>> perl-HTML-Template-2.9-1
> > > >>>>> httpd-2.0.59-1.el4s1.10.el4.centos
> > > >>>>> mod_perl-2.0.3-1.el4s1.3
> > > >>>>> ----------------------------------------------------
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>> /home/perl/Myserver/View.pm
> > > >>>>> ----------------------------------------------------
> > > >>>>> package Myserver::View;
> > > >>>>>
> > > >>>>> #Setup some essentials
> > > >>>>> use strict;         #strict tolerance for code
> > > >>>>> use Carp;           #debugging
> > > >>>>> use diagnostics;    #more debugging
> > > >>>>> use warnings;       #more debugging
> > > >>>>>
> > > >>>>> #Loadup some needed functions
> > > >>>>> use HTML::Template;
> > > >>>>>
> > > >>>>> sub new {
> > > >>>>>     my $self        = shift;
> > > >>>>>     return $self;
> > > >>>>> }
> > > >>>>>
> > > >>>>> sub mainpage {
> > > >>>>>     my $self        = shift;
> > > >>>>>     my $template    = HTML::Template->new( filename =>
> > > >>>>> '/home/Perl/tmpl/mainpage.tmpl',
> > > >>>>>             cache => 1,
> > > >>>>>             debug => 1,
> > > >>>>>             stack_debug => 1 );
> > > >>>>>     print "Content-Type: text/html\n\n";
> > > >>>>>     $template->output;
> > > >>>>>     return $self;
> > > >>>>> }
> > > >>>>>
> > > >>>>> 1;
> > > >>>>> ----------------------------------------------------
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>> /home/Perl/tests/View_mainpage.pl
> > > >>>>> ----------------------------------------------------
> > > >>>>> #!/usr/bin/perl -w
> > > >>>>>
> > > >>>>> # Test printing of the main page
> > > >>>>> print "Main Page..";
> > > >>>>>
> > > >>>>> #Let's load the view module
> > > >>>>> use lib "../";
> > > >>>>> use Myserver::View;
> > > >>>>> #Now let's load some things that are very handy
> > > >>>>> use strict;         #strict tolerance for code
> > > >>>>> use Carp;           #debugging
> > > >>>>> use warnings;       #more debugging
> > > >>>>> use diagnostics;    #even more debugging
> > > >>>>>
> > > >>>>> # Let's create an object
> > > >>>>> my $view        = Myserver::View->new;
> > > >>>>>
> > > >>>>> # Now, let's tell View to display the main page
> > > >>>>> $view->mainpage;
> > > >>>>>
> > > >>>>> print ".OK";
> > > >>>>>
> > > >>>>> 1;
> > > >>>>> ----------------------------------------------------
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>> /home/Perl/tmpl/mainpage.tmpl:
> > > >>>>> ----------------------------------------------------
> > > >>>>> <html><body bgcolor="#FF00FF">Test!</body></html>
> > > >>>>> ----------------------------------------------------
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>> Output with debugging on (as above):
> > > >>>>> ----------------------------------------------------
> > > >>>>> $ tests/View_mainpage.pl
> > > >>>>> ### HTML::Template Debug ### In _parse:
> > > >>>>> ### HTML::Template _param Stack Dump ###
> > > >>>>>
> > > >>>>> $VAR1 = [
> > > >>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > > >>>>> '
> > > >>>>>         ];
> > > >>>>>
> > > >>>>> Main Page..Content-Type: text/html
> > > >>>>>
> > > >>>>> ### HTML::Template Debug ### In output
> > > >>>>> ### HTML::Template output Stack Dump ###
> > > >>>>>
> > > >>>>> $VAR1 = [
> > > >>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > > >>>>> '
> > > >>>>>         ];
> > > >>>>>
> > > >>>>> .OK
> > > >>>>> ----------------------------------------------------
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>> Output without debugging:
> > > >>>>> ----------------------------------------------------
> > > >>>>> $ tests/View_mainpage.pl
> > > >>>>> Main Page..Content-Type: text/html
> > > >>>>>
> > > >>>>> .OK
> > > >>>>> ----------------------------------------------------
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >
> > > >
> >

RE: Custom Object-Oriented Module using HTML::Template

Posted by xyon <xy...@indigorobot.com>.

Thank you all for your advice. With that and some help from a mentor, it
is now working, with the below code:


Apache config:
-------------------------------------------------------------------
PerlSwitches -I/home/Perl/
PerlModule Myserver::Handler
<Location /admin>
    SetHandler modperl 
    PerlResponseHandler Myserver::Handler
</Location>
-------------------------------------------------------------------




Handler.pm:
-------------------------------------------------------------------
sub handler {
    my $request = shift;

    my $view    = Myserver::View->new();
    if (my $output  = $view->mainpage()) {
        $request->content_type('text/html');
        $request->print($output);
        return Apache2::Const::OK;
    } else {
        return Apache2::Const::Declined;
    };
    
1;

-------------------------------------------------------------------




View.pm
-------------------------------------------------------------------
sub new {
    my $class       = shift;
    my $self        = {};
    return bless $self, $class;
}

sub mainpage {
    my $self        = shift;
    my $template    = HTML::Template->new( 
                filename => '/home/Perl/tmpl/mainpage.tmpl',
                cache => 1,
                debug => 1, 
                stack_debug => 1 );
    return $template->output;
}

1;
-------------------------------------------------------------------




On Thu, 2008-03-13 at 12:01 -0400, Adam Prime x443 wrote:
> SetHandler modperl doesn't bind 'print' to '$r->print'.  Try SetHandler perl-script, or change your code to pass in the request object and use $r->print instead of print.
> 
> Adam
> 
> -----Original Message-----
> From: xyon [mailto:xyon@indigorobot.com]
> Sent: Thursday, March 13, 2008 11:47 AM
> To: modperl
> Subject: Re: Custom Object-Oriented Module using HTML::Template
> 
> Good suggestion, I moved the content_type to the top of the handler
> routine in Handler.pm, so it now looks like:
> 
> -------------------------------------------------------------------
> sub handler {
>     my $self        = shift;
>     $self->content_type('text/html');
> 
>     my $view        = Myserver::View->new();
>     $view->mainpage;
> 
>     # Obligatory stuff for the handler
>     return Apache2::Const::OK;
> }
> -------------------------------------------------------------------
> 
> 
> 
> I am still getting a blank page, though. Here is the latest lwp-request
> output:
> 
> 
> -------------------------------------------------------------------
> $ lwp-request -s -U -S -e -m GET "http://localhost/admin/"
> GET http://localhost/admin/
> User-Agent: lwp-request/2.07
> 
> GET http://localhost/admin/ --> 200 OK
> Connection: close
> Date: Thu, 13 Mar 2008 15:45:08 GMT
> Server: Apache
> Content-Length: 0
> Content-Type: text/html; charset=UTF-8
> Client-Date: Thu, 13 Mar 2008 15:45:09 GMT
> Client-Peer: 127.0.0.1:80
> Client-Response-Num: 1
> -------------------------------------------------------------------
> 
> 
> 
> On Thu, 2008-03-13 at 16:38 +0100, André Warnier wrote:
> > Hi.
> >
> > First, don't take my suggestions as gospel, I don't know the TT2 and do
> > not really know how you're supposed to work with it.
> > But it seems to me that this is in the wrong order :
> >
> >      $view->mainpage;
> >      $self->content_type('text/html');
> >
> > I think you should trigger the HTTP header before you generate the
> > content.  Now, whether that is the reason of your current problem or
> > not, I haven't a clue.
> >
> > But I'm trying, and I'm really interested, because I am starting to want
> > to know more about TT2 (and Catalyst) these days.  So your
> > "from-the-very beginning" approach is also very helpful to me.
> > (And I do have a certain experience of Apache2/mod_perl2)
> >
> > And, re-check your lwp-request switches, you might have disabled the
> > display of the response content (remove the -d).
> >
> > André
> >
> >
> >
> > xyon wrote:
> > > Thanks for the reply.
> > >
> > > I thought as you did (that there were too many "Content-Type"
> > > definitions), so commented out this line in the View.pm module, but that
> > > doesn't seem to have changed anything:
> > >
> > > 'print "Content-Type: text/html\n\n";'
> > >
> > >
> > >
> > >
> > > Here is the lwp command and output:
> > > -------------------------------------------------------------------
> > > $ lwp-request -e -S -s -U -m GET -Sed "http://localhost/admin/"
> > > GET http://localhost/admin/
> > > User-Agent: lwp-request/2.07
> > >
> > > GET http://localhost/admin/ --> 200 OK
> > > Connection: close
> > > Date: Thu, 13 Mar 2008 15:24:23 GMT
> > > Server: Apache
> > > Content-Length: 0
> > > Content-Type: text/html; charset=UTF-8
> > > Client-Date: Thu, 13 Mar 2008 15:24:23 GMT
> > > Client-Peer: 127.0.0.1:80
> > > Client-Response-Num: 1
> > > -------------------------------------------------------------------
> > >
> > >
> > > On Thu, 2008-03-13 at 16:11 +0100, André Warnier wrote:
> > >> Hi.
> > >>
> > >> First, a small disgression : along with perl, comes a beautiful test
> > >> tool for HTTP stuff, called "lwp-request".
> > >> Like, at the command-line :
> > >> lwp-request  (to see the options)
> > >> lwp-request -m GET -Sed "http://myserver/myURL"
> > >> (that will show you what you get as a response, without a browser
> > >> getting in the way)
> > >>
> > >> Then, below, are you not now sending one "Content-type" too many ?
> > >> It looks like you are doing it once in handler(), and once in mainpage().
> > >>
> > >> André
> > >>
> > >> xyon wrote:
> > >>> That worked great with the test script ( print $template->output; ), but
> > >>> unfortunately, I'm having trouble getting the display onto a web page
> > >>> (via the Handler). The resulting web page is blank, with no source.
> > >>>
> > >>>
> > >>> Below are my Apache configs for the handler, logs, and the handler and
> > >>> view module's latest code. I've also included the test script code, just
> > >>> in case there is some obvious reason it would work and the handler
> > >>> won't.
> > >>>
> > >>>
> > >>>
> > >>>
> > >>> Apache config:
> > >>> ----------------------------------------------------
> > >>> PerlRequire /etc/httpd/perl/startup.pl
> > >>> <Location /admin>
> > >>>     SetHandler modperl
> > >>>     PerlResponseHandler Myserver::Handler
> > >>> </Location>
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>>
> > >>> /etc/httpd/perl/startup.pl:
> > >>> ----------------------------------------------------
> > >>> use lib qw(/home/Perl/);
> > >>> 1;
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>>
> > >>> Apache log:
> > >>> ----------------------------------------------------
> > >>> ==> /var/log/httpd/error_log <==
> > >>> ### HTML::Template Debug ### In _parse:
> > >>> ### HTML::Template _param Stack Dump ###
> > >>>
> > >>> $VAR1 = [
> > >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > >>> '
> > >>>         ];
> > >>>
> > >>> ### HTML::Template Debug ### In output
> > >>> ### HTML::Template output Stack Dump ###
> > >>>
> > >>> $VAR1 = [
> > >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > >>> '
> > >>>         ];
> > >>>
> > >>>
> > >>> ==> /var/log/httpd/ssl_request_log <==
> > >>> [13/Mar/2008:10:48:38 -0400] 10.5.5.5 TLSv1 DHE-RSA-AES256-SHA
> > >>> "GET /admin/ HTTP/1.1" -
> > >>>
> > >>> ==> /var/log/httpd/ssl_access_log <==
> > >>> 10.5.5.5 - - [13/Mar/2008:10:48:38 -0400] "GET /admin/ HTTP/1.1" 200 -
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>>
> > >>> /home/Perl/Myserver/Handler.pm
> > >>> ----------------------------------------------------
> > >>> package Myserver::Handler;
> > >>>
> > >>> #Setup some essentials
> > >>> use strict;         #strict tolerance for code
> > >>> use Carp;           #debugging
> > >>> use diagnostics;    #more debugging
> > >>> use warnings;       #more debugging
> > >>>
> > >>> #Handler-related stuff
> > >>> use Apache2::RequestRec ();
> > >>> use Apache2::RequestIO ();
> > >>> use Apache2::Const -compile => qw(OK);
> > >>>
> > >>> sub handler {
> > >>>     my $self        = shift;
> > >>>
> > >>>     my $view        = Myserver::View->new();
> > >>>     $view->mainpage;
> > >>>
> > >>>     # Obligatory stuff for the handler
> > >>>     $self->content_type('text/html');
> > >>>     return Apache2::Const::OK;
> > >>>
> > >>> }
> > >>>
> > >>> 1;
> > >>>
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>>
> > >>> /home/Perl/Myserver/View.pm:
> > >>> ----------------------------------------------------
> > >>> package Myserver::View;
> > >>>
> > >>> #Setup some essentials
> > >>> use strict;         #strict tolerance for code
> > >>> use Carp;           #debugging
> > >>> use diagnostics;    #more debugging
> > >>> use warnings;       #more debugging
> > >>>
> > >>> #Loadup some needed functions
> > >>> use HTML::Template;
> > >>>
> > >>> sub new {
> > >>>     my $self        = shift;
> > >>>     return $self;
> > >>> }
> > >>>
> > >>> sub mainpage {
> > >>>     my $self        = shift;
> > >>>     my $template    = HTML::Template->new(
> > >>>           filename => '/home/Perl/tmpl/mainpage.tmpl',
> > >>>                 cache => 1,
> > >>>                 debug => 1,
> > >>>                 stack_debug => 1 );
> > >>>     print "Content-Type: text/html\n\n";
> > >>>     print $template->output;
> > >>>     return $self;
> > >>> }
> > >>>
> > >>> 1;
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>>
> > >>> /home/Perl/tmpl/mainpage.tmpl:
> > >>> ----------------------------------------------------
> > >>> <html><body bgcolor="#FF00FF">Test!</body></html>
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>>
> > >>> /home/Perl/tests/View_mainpage.pl
> > >>> ----------------------------------------------------
> > >>> #!/usr/bin/perl -w
> > >>>
> > >>> # Test printing of the main page
> > >>> print "Main Page..";
> > >>>
> > >>> #Let's load the view module
> > >>> use lib "../";
> > >>> use Myserver::View;
> > >>> #Now let's load some things that are very handy
> > >>> use strict;         #strict tolerance for code
> > >>> use Carp;           #debugging
> > >>> use warnings;       #more debugging
> > >>> use diagnostics;    #even more debugging
> > >>>
> > >>> # Let's create an object
> > >>> my $view        = Myserver::View->new;
> > >>>
> > >>> # Now, let's tell View to display the main page
> > >>> $view->mainpage;
> > >>>
> > >>> print ".OK";
> > >>>
> > >>> 1;
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>>
> > >>> On Thu, 2008-03-13 at 13:29 +0800, Foo JH wrote:
> > >>>> try print $template->output;
> > >>>>
> > >>>> You forgot the print();
> > >>>>
> > >>>> xyon wrote:
> > >>>>> Hey everyone,
> > >>>>>
> > >>>>> Firstly, I apologize I sent the previous email under an incorrect subject line.
> > >>>>>
> > >>>>> I am working on my first Object-Oriented project, and have hit a slight
> > >>>>> snag. I am using HTML::Template to output within the View module, but it
> > >>>>> never outputs. I don't see any errors in the logs, I just get a blank
> > >>>>> page. Below is pertinent information including a test script with its
> > >>>>> output:
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> OS Info:
> > >>>>> ----------------------------------------------------
> > >>>>> CentOS release 4.6 (Final)
> > >>>>> ----------------------------------------------------
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> Package info:
> > >>>>> ----------------------------------------------------
> > >>>>> perl-5.8.8-11
> > >>>>> perl-HTML-Template-2.9-1
> > >>>>> httpd-2.0.59-1.el4s1.10.el4.centos
> > >>>>> mod_perl-2.0.3-1.el4s1.3
> > >>>>> ----------------------------------------------------
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> /home/perl/Myserver/View.pm
> > >>>>> ----------------------------------------------------
> > >>>>> package Myserver::View;
> > >>>>>
> > >>>>> #Setup some essentials
> > >>>>> use strict;         #strict tolerance for code
> > >>>>> use Carp;           #debugging
> > >>>>> use diagnostics;    #more debugging
> > >>>>> use warnings;       #more debugging
> > >>>>>
> > >>>>> #Loadup some needed functions
> > >>>>> use HTML::Template;
> > >>>>>
> > >>>>> sub new {
> > >>>>>     my $self        = shift;
> > >>>>>     return $self;
> > >>>>> }
> > >>>>>
> > >>>>> sub mainpage {
> > >>>>>     my $self        = shift;
> > >>>>>     my $template    = HTML::Template->new( filename =>
> > >>>>> '/home/Perl/tmpl/mainpage.tmpl',
> > >>>>>             cache => 1,
> > >>>>>             debug => 1,
> > >>>>>             stack_debug => 1 );
> > >>>>>     print "Content-Type: text/html\n\n";
> > >>>>>     $template->output;
> > >>>>>     return $self;
> > >>>>> }
> > >>>>>
> > >>>>> 1;
> > >>>>> ----------------------------------------------------
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> /home/Perl/tests/View_mainpage.pl
> > >>>>> ----------------------------------------------------
> > >>>>> #!/usr/bin/perl -w
> > >>>>>
> > >>>>> # Test printing of the main page
> > >>>>> print "Main Page..";
> > >>>>>
> > >>>>> #Let's load the view module
> > >>>>> use lib "../";
> > >>>>> use Myserver::View;
> > >>>>> #Now let's load some things that are very handy
> > >>>>> use strict;         #strict tolerance for code
> > >>>>> use Carp;           #debugging
> > >>>>> use warnings;       #more debugging
> > >>>>> use diagnostics;    #even more debugging
> > >>>>>
> > >>>>> # Let's create an object
> > >>>>> my $view        = Myserver::View->new;
> > >>>>>
> > >>>>> # Now, let's tell View to display the main page
> > >>>>> $view->mainpage;
> > >>>>>
> > >>>>> print ".OK";
> > >>>>>
> > >>>>> 1;
> > >>>>> ----------------------------------------------------
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> /home/Perl/tmpl/mainpage.tmpl:
> > >>>>> ----------------------------------------------------
> > >>>>> <html><body bgcolor="#FF00FF">Test!</body></html>
> > >>>>> ----------------------------------------------------
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> Output with debugging on (as above):
> > >>>>> ----------------------------------------------------
> > >>>>> $ tests/View_mainpage.pl
> > >>>>> ### HTML::Template Debug ### In _parse:
> > >>>>> ### HTML::Template _param Stack Dump ###
> > >>>>>
> > >>>>> $VAR1 = [
> > >>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > >>>>> '
> > >>>>>         ];
> > >>>>>
> > >>>>> Main Page..Content-Type: text/html
> > >>>>>
> > >>>>> ### HTML::Template Debug ### In output
> > >>>>> ### HTML::Template output Stack Dump ###
> > >>>>>
> > >>>>> $VAR1 = [
> > >>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > >>>>> '
> > >>>>>         ];
> > >>>>>
> > >>>>> .OK
> > >>>>> ----------------------------------------------------
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>> Output without debugging:
> > >>>>> ----------------------------------------------------
> > >>>>> $ tests/View_mainpage.pl
> > >>>>> Main Page..Content-Type: text/html
> > >>>>>
> > >>>>> .OK
> > >>>>> ----------------------------------------------------
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>>
> > >
> > >
>

RE: Custom Object-Oriented Module using HTML::Template

Posted by Adam Prime x443 <ap...@brunico.com>.

SetHandler modperl doesn't bind 'print' to '$r->print'.  Try SetHandler perl-script, or change your code to pass in the request object and use $r->print instead of print.

Adam

-----Original Message-----
From: xyon [mailto:xyon@indigorobot.com]
Sent: Thursday, March 13, 2008 11:47 AM
To: modperl
Subject: Re: Custom Object-Oriented Module using HTML::Template

Good suggestion, I moved the content_type to the top of the handler
routine in Handler.pm, so it now looks like:

-------------------------------------------------------------------
sub handler {
    my $self        = shift;
    $self->content_type('text/html');

    my $view        = Myserver::View->new();
    $view->mainpage;

    # Obligatory stuff for the handler
    return Apache2::Const::OK;
}
-------------------------------------------------------------------



I am still getting a blank page, though. Here is the latest lwp-request
output:


-------------------------------------------------------------------
$ lwp-request -s -U -S -e -m GET "http://localhost/admin/"
GET http://localhost/admin/
User-Agent: lwp-request/2.07

GET http://localhost/admin/ --> 200 OK
Connection: close
Date: Thu, 13 Mar 2008 15:45:08 GMT
Server: Apache
Content-Length: 0
Content-Type: text/html; charset=UTF-8
Client-Date: Thu, 13 Mar 2008 15:45:09 GMT
Client-Peer: 127.0.0.1:80
Client-Response-Num: 1
-------------------------------------------------------------------



On Thu, 2008-03-13 at 16:38 +0100, André Warnier wrote:
> Hi.
>
> First, don't take my suggestions as gospel, I don't know the TT2 and do
> not really know how you're supposed to work with it.
> But it seems to me that this is in the wrong order :
>
>      $view->mainpage;
>      $self->content_type('text/html');
>
> I think you should trigger the HTTP header before you generate the
> content.  Now, whether that is the reason of your current problem or
> not, I haven't a clue.
>
> But I'm trying, and I'm really interested, because I am starting to want
> to know more about TT2 (and Catalyst) these days.  So your
> "from-the-very beginning" approach is also very helpful to me.
> (And I do have a certain experience of Apache2/mod_perl2)
>
> And, re-check your lwp-request switches, you might have disabled the
> display of the response content (remove the -d).
>
> André
>
>
>
> xyon wrote:
> > Thanks for the reply.
> >
> > I thought as you did (that there were too many "Content-Type"
> > definitions), so commented out this line in the View.pm module, but that
> > doesn't seem to have changed anything:
> >
> > 'print "Content-Type: text/html\n\n";'
> >
> >
> >
> >
> > Here is the lwp command and output:
> > -------------------------------------------------------------------
> > $ lwp-request -e -S -s -U -m GET -Sed "http://localhost/admin/"
> > GET http://localhost/admin/
> > User-Agent: lwp-request/2.07
> >
> > GET http://localhost/admin/ --> 200 OK
> > Connection: close
> > Date: Thu, 13 Mar 2008 15:24:23 GMT
> > Server: Apache
> > Content-Length: 0
> > Content-Type: text/html; charset=UTF-8
> > Client-Date: Thu, 13 Mar 2008 15:24:23 GMT
> > Client-Peer: 127.0.0.1:80
> > Client-Response-Num: 1
> > -------------------------------------------------------------------
> >
> >
> > On Thu, 2008-03-13 at 16:11 +0100, André Warnier wrote:
> >> Hi.
> >>
> >> First, a small disgression : along with perl, comes a beautiful test
> >> tool for HTTP stuff, called "lwp-request".
> >> Like, at the command-line :
> >> lwp-request  (to see the options)
> >> lwp-request -m GET -Sed "http://myserver/myURL"
> >> (that will show you what you get as a response, without a browser
> >> getting in the way)
> >>
> >> Then, below, are you not now sending one "Content-type" too many ?
> >> It looks like you are doing it once in handler(), and once in mainpage().
> >>
> >> André
> >>
> >> xyon wrote:
> >>> That worked great with the test script ( print $template->output; ), but
> >>> unfortunately, I'm having trouble getting the display onto a web page
> >>> (via the Handler). The resulting web page is blank, with no source.
> >>>
> >>>
> >>> Below are my Apache configs for the handler, logs, and the handler and
> >>> view module's latest code. I've also included the test script code, just
> >>> in case there is some obvious reason it would work and the handler
> >>> won't.
> >>>
> >>>
> >>>
> >>>
> >>> Apache config:
> >>> ----------------------------------------------------
> >>> PerlRequire /etc/httpd/perl/startup.pl
> >>> <Location /admin>
> >>>     SetHandler modperl
> >>>     PerlResponseHandler Myserver::Handler
> >>> </Location>
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> /etc/httpd/perl/startup.pl:
> >>> ----------------------------------------------------
> >>> use lib qw(/home/Perl/);
> >>> 1;
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> Apache log:
> >>> ----------------------------------------------------
> >>> ==> /var/log/httpd/error_log <==
> >>> ### HTML::Template Debug ### In _parse:
> >>> ### HTML::Template _param Stack Dump ###
> >>>
> >>> $VAR1 = [
> >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> >>> '
> >>>         ];
> >>>
> >>> ### HTML::Template Debug ### In output
> >>> ### HTML::Template output Stack Dump ###
> >>>
> >>> $VAR1 = [
> >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> >>> '
> >>>         ];
> >>>
> >>>
> >>> ==> /var/log/httpd/ssl_request_log <==
> >>> [13/Mar/2008:10:48:38 -0400] 10.5.5.5 TLSv1 DHE-RSA-AES256-SHA
> >>> "GET /admin/ HTTP/1.1" -
> >>>
> >>> ==> /var/log/httpd/ssl_access_log <==
> >>> 10.5.5.5 - - [13/Mar/2008:10:48:38 -0400] "GET /admin/ HTTP/1.1" 200 -
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> /home/Perl/Myserver/Handler.pm
> >>> ----------------------------------------------------
> >>> package Myserver::Handler;
> >>>
> >>> #Setup some essentials
> >>> use strict;         #strict tolerance for code
> >>> use Carp;           #debugging
> >>> use diagnostics;    #more debugging
> >>> use warnings;       #more debugging
> >>>
> >>> #Handler-related stuff
> >>> use Apache2::RequestRec ();
> >>> use Apache2::RequestIO ();
> >>> use Apache2::Const -compile => qw(OK);
> >>>
> >>> sub handler {
> >>>     my $self        = shift;
> >>>
> >>>     my $view        = Myserver::View->new();
> >>>     $view->mainpage;
> >>>
> >>>     # Obligatory stuff for the handler
> >>>     $self->content_type('text/html');
> >>>     return Apache2::Const::OK;
> >>>
> >>> }
> >>>
> >>> 1;
> >>>
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> /home/Perl/Myserver/View.pm:
> >>> ----------------------------------------------------
> >>> package Myserver::View;
> >>>
> >>> #Setup some essentials
> >>> use strict;         #strict tolerance for code
> >>> use Carp;           #debugging
> >>> use diagnostics;    #more debugging
> >>> use warnings;       #more debugging
> >>>
> >>> #Loadup some needed functions
> >>> use HTML::Template;
> >>>
> >>> sub new {
> >>>     my $self        = shift;
> >>>     return $self;
> >>> }
> >>>
> >>> sub mainpage {
> >>>     my $self        = shift;
> >>>     my $template    = HTML::Template->new(
> >>>           filename => '/home/Perl/tmpl/mainpage.tmpl',
> >>>                 cache => 1,
> >>>                 debug => 1,
> >>>                 stack_debug => 1 );
> >>>     print "Content-Type: text/html\n\n";
> >>>     print $template->output;
> >>>     return $self;
> >>> }
> >>>
> >>> 1;
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> /home/Perl/tmpl/mainpage.tmpl:
> >>> ----------------------------------------------------
> >>> <html><body bgcolor="#FF00FF">Test!</body></html>
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> /home/Perl/tests/View_mainpage.pl
> >>> ----------------------------------------------------
> >>> #!/usr/bin/perl -w
> >>>
> >>> # Test printing of the main page
> >>> print "Main Page..";
> >>>
> >>> #Let's load the view module
> >>> use lib "../";
> >>> use Myserver::View;
> >>> #Now let's load some things that are very handy
> >>> use strict;         #strict tolerance for code
> >>> use Carp;           #debugging
> >>> use warnings;       #more debugging
> >>> use diagnostics;    #even more debugging
> >>>
> >>> # Let's create an object
> >>> my $view        = Myserver::View->new;
> >>>
> >>> # Now, let's tell View to display the main page
> >>> $view->mainpage;
> >>>
> >>> print ".OK";
> >>>
> >>> 1;
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> On Thu, 2008-03-13 at 13:29 +0800, Foo JH wrote:
> >>>> try print $template->output;
> >>>>
> >>>> You forgot the print();
> >>>>
> >>>> xyon wrote:
> >>>>> Hey everyone,
> >>>>>
> >>>>> Firstly, I apologize I sent the previous email under an incorrect subject line.
> >>>>>
> >>>>> I am working on my first Object-Oriented project, and have hit a slight
> >>>>> snag. I am using HTML::Template to output within the View module, but it
> >>>>> never outputs. I don't see any errors in the logs, I just get a blank
> >>>>> page. Below is pertinent information including a test script with its
> >>>>> output:
> >>>>>
> >>>>>
> >>>>>
> >>>>> OS Info:
> >>>>> ----------------------------------------------------
> >>>>> CentOS release 4.6 (Final)
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> Package info:
> >>>>> ----------------------------------------------------
> >>>>> perl-5.8.8-11
> >>>>> perl-HTML-Template-2.9-1
> >>>>> httpd-2.0.59-1.el4s1.10.el4.centos
> >>>>> mod_perl-2.0.3-1.el4s1.3
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> /home/perl/Myserver/View.pm
> >>>>> ----------------------------------------------------
> >>>>> package Myserver::View;
> >>>>>
> >>>>> #Setup some essentials
> >>>>> use strict;         #strict tolerance for code
> >>>>> use Carp;           #debugging
> >>>>> use diagnostics;    #more debugging
> >>>>> use warnings;       #more debugging
> >>>>>
> >>>>> #Loadup some needed functions
> >>>>> use HTML::Template;
> >>>>>
> >>>>> sub new {
> >>>>>     my $self        = shift;
> >>>>>     return $self;
> >>>>> }
> >>>>>
> >>>>> sub mainpage {
> >>>>>     my $self        = shift;
> >>>>>     my $template    = HTML::Template->new( filename =>
> >>>>> '/home/Perl/tmpl/mainpage.tmpl',
> >>>>>             cache => 1,
> >>>>>             debug => 1,
> >>>>>             stack_debug => 1 );
> >>>>>     print "Content-Type: text/html\n\n";
> >>>>>     $template->output;
> >>>>>     return $self;
> >>>>> }
> >>>>>
> >>>>> 1;
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> /home/Perl/tests/View_mainpage.pl
> >>>>> ----------------------------------------------------
> >>>>> #!/usr/bin/perl -w
> >>>>>
> >>>>> # Test printing of the main page
> >>>>> print "Main Page..";
> >>>>>
> >>>>> #Let's load the view module
> >>>>> use lib "../";
> >>>>> use Myserver::View;
> >>>>> #Now let's load some things that are very handy
> >>>>> use strict;         #strict tolerance for code
> >>>>> use Carp;           #debugging
> >>>>> use warnings;       #more debugging
> >>>>> use diagnostics;    #even more debugging
> >>>>>
> >>>>> # Let's create an object
> >>>>> my $view        = Myserver::View->new;
> >>>>>
> >>>>> # Now, let's tell View to display the main page
> >>>>> $view->mainpage;
> >>>>>
> >>>>> print ".OK";
> >>>>>
> >>>>> 1;
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> /home/Perl/tmpl/mainpage.tmpl:
> >>>>> ----------------------------------------------------
> >>>>> <html><body bgcolor="#FF00FF">Test!</body></html>
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> Output with debugging on (as above):
> >>>>> ----------------------------------------------------
> >>>>> $ tests/View_mainpage.pl
> >>>>> ### HTML::Template Debug ### In _parse:
> >>>>> ### HTML::Template _param Stack Dump ###
> >>>>>
> >>>>> $VAR1 = [
> >>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> >>>>> '
> >>>>>         ];
> >>>>>
> >>>>> Main Page..Content-Type: text/html
> >>>>>
> >>>>> ### HTML::Template Debug ### In output
> >>>>> ### HTML::Template output Stack Dump ###
> >>>>>
> >>>>> $VAR1 = [
> >>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> >>>>> '
> >>>>>         ];
> >>>>>
> >>>>> .OK
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> Output without debugging:
> >>>>> ----------------------------------------------------
> >>>>> $ tests/View_mainpage.pl
> >>>>> Main Page..Content-Type: text/html
> >>>>>
> >>>>> .OK
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >
> >

Re: Custom Object-Oriented Module using HTML::Template

Posted by xyon <xy...@indigorobot.com>.

Good suggestion, I moved the content_type to the top of the handler
routine in Handler.pm, so it now looks like:

-------------------------------------------------------------------
sub handler {
    my $self        = shift;
    $self->content_type('text/html');
    
    my $view        = Myserver::View->new();
    $view->mainpage;

    # Obligatory stuff for the handler
    return Apache2::Const::OK;
}
-------------------------------------------------------------------



I am still getting a blank page, though. Here is the latest lwp-request
output:


-------------------------------------------------------------------
$ lwp-request -s -U -S -e -m GET "http://localhost/admin/"
GET http://localhost/admin/
User-Agent: lwp-request/2.07

GET http://localhost/admin/ --> 200 OK
Connection: close
Date: Thu, 13 Mar 2008 15:45:08 GMT
Server: Apache
Content-Length: 0
Content-Type: text/html; charset=UTF-8
Client-Date: Thu, 13 Mar 2008 15:45:09 GMT
Client-Peer: 127.0.0.1:80
Client-Response-Num: 1
-------------------------------------------------------------------



On Thu, 2008-03-13 at 16:38 +0100, André Warnier wrote:
> Hi.
> 
> First, don't take my suggestions as gospel, I don't know the TT2 and do 
> not really know how you're supposed to work with it.
> But it seems to me that this is in the wrong order :
> 
>      $view->mainpage;
>      $self->content_type('text/html');
> 
> I think you should trigger the HTTP header before you generate the 
> content.  Now, whether that is the reason of your current problem or 
> not, I haven't a clue.
> 
> But I'm trying, and I'm really interested, because I am starting to want 
> to know more about TT2 (and Catalyst) these days.  So your 
> "from-the-very beginning" approach is also very helpful to me.
> (And I do have a certain experience of Apache2/mod_perl2)
> 
> And, re-check your lwp-request switches, you might have disabled the 
> display of the response content (remove the -d).
> 
> André
> 
> 
> 
> xyon wrote:
> > Thanks for the reply.
> > 
> > I thought as you did (that there were too many "Content-Type"
> > definitions), so commented out this line in the View.pm module, but that
> > doesn't seem to have changed anything:
> > 
> > 'print "Content-Type: text/html\n\n";'
> > 
> > 
> > 
> > 
> > Here is the lwp command and output:
> > -------------------------------------------------------------------
> > $ lwp-request -e -S -s -U -m GET -Sed "http://localhost/admin/"
> > GET http://localhost/admin/
> > User-Agent: lwp-request/2.07
> > 
> > GET http://localhost/admin/ --> 200 OK
> > Connection: close
> > Date: Thu, 13 Mar 2008 15:24:23 GMT
> > Server: Apache
> > Content-Length: 0
> > Content-Type: text/html; charset=UTF-8
> > Client-Date: Thu, 13 Mar 2008 15:24:23 GMT
> > Client-Peer: 127.0.0.1:80
> > Client-Response-Num: 1
> > -------------------------------------------------------------------
> > 
> > 
> > On Thu, 2008-03-13 at 16:11 +0100, André Warnier wrote:
> >> Hi.
> >>
> >> First, a small disgression : along with perl, comes a beautiful test 
> >> tool for HTTP stuff, called "lwp-request".
> >> Like, at the command-line :
> >> lwp-request  (to see the options)
> >> lwp-request -m GET -Sed "http://myserver/myURL"
> >> (that will show you what you get as a response, without a browser 
> >> getting in the way)
> >>
> >> Then, below, are you not now sending one "Content-type" too many ?
> >> It looks like you are doing it once in handler(), and once in mainpage().
> >>
> >> André
> >>
> >> xyon wrote:
> >>> That worked great with the test script ( print $template->output; ), but
> >>> unfortunately, I'm having trouble getting the display onto a web page
> >>> (via the Handler). The resulting web page is blank, with no source.
> >>>
> >>>
> >>> Below are my Apache configs for the handler, logs, and the handler and
> >>> view module's latest code. I've also included the test script code, just
> >>> in case there is some obvious reason it would work and the handler
> >>> won't.
> >>>
> >>>
> >>>
> >>>
> >>> Apache config:
> >>> ----------------------------------------------------
> >>> PerlRequire /etc/httpd/perl/startup.pl
> >>> <Location /admin>
> >>>     SetHandler modperl 
> >>>     PerlResponseHandler Myserver::Handler
> >>> </Location>
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> /etc/httpd/perl/startup.pl:
> >>> ----------------------------------------------------
> >>> use lib qw(/home/Perl/);
> >>> 1;
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> Apache log:
> >>> ----------------------------------------------------
> >>> ==> /var/log/httpd/error_log <==
> >>> ### HTML::Template Debug ### In _parse:
> >>> ### HTML::Template _param Stack Dump ###
> >>>
> >>> $VAR1 = [
> >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> >>> '
> >>>         ];
> >>>
> >>> ### HTML::Template Debug ### In output
> >>> ### HTML::Template output Stack Dump ###
> >>>
> >>> $VAR1 = [
> >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> >>> '
> >>>         ];
> >>>
> >>>
> >>> ==> /var/log/httpd/ssl_request_log <==
> >>> [13/Mar/2008:10:48:38 -0400] 10.5.5.5 TLSv1 DHE-RSA-AES256-SHA
> >>> "GET /admin/ HTTP/1.1" -
> >>>
> >>> ==> /var/log/httpd/ssl_access_log <==
> >>> 10.5.5.5 - - [13/Mar/2008:10:48:38 -0400] "GET /admin/ HTTP/1.1" 200 -
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> /home/Perl/Myserver/Handler.pm
> >>> ----------------------------------------------------
> >>> package Myserver::Handler;
> >>>
> >>> #Setup some essentials
> >>> use strict;         #strict tolerance for code
> >>> use Carp;           #debugging
> >>> use diagnostics;    #more debugging
> >>> use warnings;       #more debugging
> >>>
> >>> #Handler-related stuff
> >>> use Apache2::RequestRec ();
> >>> use Apache2::RequestIO ();
> >>> use Apache2::Const -compile => qw(OK);
> >>>
> >>> sub handler {
> >>>     my $self        = shift;
> >>>     
> >>>     my $view        = Myserver::View->new();
> >>>     $view->mainpage;
> >>>
> >>>     # Obligatory stuff for the handler
> >>>     $self->content_type('text/html');
> >>>     return Apache2::Const::OK;
> >>>
> >>> }
> >>>
> >>> 1;
> >>>
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> /home/Perl/Myserver/View.pm:
> >>> ----------------------------------------------------
> >>> package Myserver::View;
> >>>
> >>> #Setup some essentials
> >>> use strict;         #strict tolerance for code
> >>> use Carp;           #debugging
> >>> use diagnostics;    #more debugging
> >>> use warnings;       #more debugging
> >>>
> >>> #Loadup some needed functions
> >>> use HTML::Template;
> >>>
> >>> sub new {
> >>>     my $self        = shift;
> >>>     return $self;
> >>> }
> >>>
> >>> sub mainpage {
> >>>     my $self        = shift;
> >>>     my $template    = HTML::Template->new(
> >>> 		filename => '/home/Perl/tmpl/mainpage.tmpl',
> >>>                 cache => 1,
> >>>                 debug => 1,
> >>>                 stack_debug => 1 );
> >>>     print "Content-Type: text/html\n\n";
> >>>     print $template->output;
> >>>     return $self;
> >>> }
> >>>
> >>> 1;
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> /home/Perl/tmpl/mainpage.tmpl:
> >>> ----------------------------------------------------
> >>> <html><body bgcolor="#FF00FF">Test!</body></html>
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> /home/Perl/tests/View_mainpage.pl
> >>> ----------------------------------------------------
> >>> #!/usr/bin/perl -w
> >>>
> >>> # Test printing of the main page
> >>> print "Main Page..";
> >>>
> >>> #Let's load the view module
> >>> use lib "../";
> >>> use Myserver::View;
> >>> #Now let's load some things that are very handy
> >>> use strict;         #strict tolerance for code
> >>> use Carp;           #debugging
> >>> use warnings;       #more debugging
> >>> use diagnostics;    #even more debugging
> >>>
> >>> # Let's create an object
> >>> my $view        = Myserver::View->new;
> >>>
> >>> # Now, let's tell View to display the main page
> >>> $view->mainpage;
> >>>
> >>> print ".OK";
> >>>
> >>> 1;
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> On Thu, 2008-03-13 at 13:29 +0800, Foo JH wrote:
> >>>> try print $template->output;
> >>>>
> >>>> You forgot the print();
> >>>>
> >>>> xyon wrote:
> >>>>> Hey everyone,
> >>>>>
> >>>>> Firstly, I apologize I sent the previous email under an incorrect subject line.
> >>>>>
> >>>>> I am working on my first Object-Oriented project, and have hit a slight
> >>>>> snag. I am using HTML::Template to output within the View module, but it
> >>>>> never outputs. I don't see any errors in the logs, I just get a blank
> >>>>> page. Below is pertinent information including a test script with its
> >>>>> output:
> >>>>>
> >>>>>
> >>>>>
> >>>>> OS Info:
> >>>>> ----------------------------------------------------
> >>>>> CentOS release 4.6 (Final)
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> Package info:
> >>>>> ----------------------------------------------------
> >>>>> perl-5.8.8-11
> >>>>> perl-HTML-Template-2.9-1
> >>>>> httpd-2.0.59-1.el4s1.10.el4.centos
> >>>>> mod_perl-2.0.3-1.el4s1.3
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> /home/perl/Myserver/View.pm
> >>>>> ----------------------------------------------------
> >>>>> package Myserver::View;
> >>>>>
> >>>>> #Setup some essentials
> >>>>> use strict;         #strict tolerance for code
> >>>>> use Carp;           #debugging
> >>>>> use diagnostics;    #more debugging
> >>>>> use warnings;       #more debugging
> >>>>>
> >>>>> #Loadup some needed functions
> >>>>> use HTML::Template;
> >>>>>
> >>>>> sub new {
> >>>>>     my $self        = shift;
> >>>>>     return $self;
> >>>>> }
> >>>>>
> >>>>> sub mainpage {
> >>>>>     my $self        = shift;
> >>>>>     my $template    = HTML::Template->new( filename =>
> >>>>> '/home/Perl/tmpl/mainpage.tmpl',
> >>>>>             cache => 1,
> >>>>>             debug => 1, 
> >>>>>             stack_debug => 1 );
> >>>>>     print "Content-Type: text/html\n\n";
> >>>>>     $template->output;
> >>>>>     return $self;
> >>>>> }
> >>>>>
> >>>>> 1;
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> /home/Perl/tests/View_mainpage.pl
> >>>>> ----------------------------------------------------
> >>>>> #!/usr/bin/perl -w
> >>>>>
> >>>>> # Test printing of the main page
> >>>>> print "Main Page..";
> >>>>>
> >>>>> #Let's load the view module
> >>>>> use lib "../";
> >>>>> use Myserver::View;
> >>>>> #Now let's load some things that are very handy
> >>>>> use strict;         #strict tolerance for code
> >>>>> use Carp;           #debugging
> >>>>> use warnings;       #more debugging
> >>>>> use diagnostics;    #even more debugging
> >>>>>
> >>>>> # Let's create an object
> >>>>> my $view        = Myserver::View->new;
> >>>>>
> >>>>> # Now, let's tell View to display the main page
> >>>>> $view->mainpage;
> >>>>>
> >>>>> print ".OK";
> >>>>>
> >>>>> 1;
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> /home/Perl/tmpl/mainpage.tmpl:
> >>>>> ----------------------------------------------------
> >>>>> <html><body bgcolor="#FF00FF">Test!</body></html>
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> Output with debugging on (as above):
> >>>>> ----------------------------------------------------
> >>>>> $ tests/View_mainpage.pl 
> >>>>> ### HTML::Template Debug ### In _parse:
> >>>>> ### HTML::Template _param Stack Dump ###
> >>>>>
> >>>>> $VAR1 = [
> >>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> >>>>> '
> >>>>>         ];
> >>>>>
> >>>>> Main Page..Content-Type: text/html
> >>>>>
> >>>>> ### HTML::Template Debug ### In output
> >>>>> ### HTML::Template output Stack Dump ###
> >>>>>
> >>>>> $VAR1 = [
> >>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> >>>>> '
> >>>>>         ];
> >>>>>
> >>>>> .OK
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>> Output without debugging:
> >>>>> ----------------------------------------------------
> >>>>> $ tests/View_mainpage.pl 
> >>>>> Main Page..Content-Type: text/html
> >>>>>
> >>>>> .OK
> >>>>> ----------------------------------------------------
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>   
> > 
> >

Re: Custom Object-Oriented Module using HTML::Template

Posted by André Warnier <aw...@ice-sa.com>.

Hi.

First, don't take my suggestions as gospel, I don't know the TT2 and do 
not really know how you're supposed to work with it.
But it seems to me that this is in the wrong order :

     $view->mainpage;
     $self->content_type('text/html');

I think you should trigger the HTTP header before you generate the 
content.  Now, whether that is the reason of your current problem or 
not, I haven't a clue.

But I'm trying, and I'm really interested, because I am starting to want 
to know more about TT2 (and Catalyst) these days.  So your 
"from-the-very beginning" approach is also very helpful to me.
(And I do have a certain experience of Apache2/mod_perl2)

And, re-check your lwp-request switches, you might have disabled the 
display of the response content (remove the -d).

André



xyon wrote:
> Thanks for the reply.
> 
> I thought as you did (that there were too many "Content-Type"
> definitions), so commented out this line in the View.pm module, but that
> doesn't seem to have changed anything:
> 
> 'print "Content-Type: text/html\n\n";'
> 
> 
> 
> 
> Here is the lwp command and output:
> -------------------------------------------------------------------
> $ lwp-request -e -S -s -U -m GET -Sed "http://localhost/admin/"
> GET http://localhost/admin/
> User-Agent: lwp-request/2.07
> 
> GET http://localhost/admin/ --> 200 OK
> Connection: close
> Date: Thu, 13 Mar 2008 15:24:23 GMT
> Server: Apache
> Content-Length: 0
> Content-Type: text/html; charset=UTF-8
> Client-Date: Thu, 13 Mar 2008 15:24:23 GMT
> Client-Peer: 127.0.0.1:80
> Client-Response-Num: 1
> -------------------------------------------------------------------
> 
> 
> On Thu, 2008-03-13 at 16:11 +0100, André Warnier wrote:
>> Hi.
>>
>> First, a small disgression : along with perl, comes a beautiful test 
>> tool for HTTP stuff, called "lwp-request".
>> Like, at the command-line :
>> lwp-request  (to see the options)
>> lwp-request -m GET -Sed "http://myserver/myURL"
>> (that will show you what you get as a response, without a browser 
>> getting in the way)
>>
>> Then, below, are you not now sending one "Content-type" too many ?
>> It looks like you are doing it once in handler(), and once in mainpage().
>>
>> André
>>
>> xyon wrote:
>>> That worked great with the test script ( print $template->output; ), but
>>> unfortunately, I'm having trouble getting the display onto a web page
>>> (via the Handler). The resulting web page is blank, with no source.
>>>
>>>
>>> Below are my Apache configs for the handler, logs, and the handler and
>>> view module's latest code. I've also included the test script code, just
>>> in case there is some obvious reason it would work and the handler
>>> won't.
>>>
>>>
>>>
>>>
>>> Apache config:
>>> ----------------------------------------------------
>>> PerlRequire /etc/httpd/perl/startup.pl
>>> <Location /admin>
>>>     SetHandler modperl 
>>>     PerlResponseHandler Myserver::Handler
>>> </Location>
>>> ----------------------------------------------------
>>>
>>>
>>>
>>>
>>> /etc/httpd/perl/startup.pl:
>>> ----------------------------------------------------
>>> use lib qw(/home/Perl/);
>>> 1;
>>> ----------------------------------------------------
>>>
>>>
>>>
>>>
>>> Apache log:
>>> ----------------------------------------------------
>>> ==> /var/log/httpd/error_log <==
>>> ### HTML::Template Debug ### In _parse:
>>> ### HTML::Template _param Stack Dump ###
>>>
>>> $VAR1 = [
>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
>>> '
>>>         ];
>>>
>>> ### HTML::Template Debug ### In output
>>> ### HTML::Template output Stack Dump ###
>>>
>>> $VAR1 = [
>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
>>> '
>>>         ];
>>>
>>>
>>> ==> /var/log/httpd/ssl_request_log <==
>>> [13/Mar/2008:10:48:38 -0400] 10.5.5.5 TLSv1 DHE-RSA-AES256-SHA
>>> "GET /admin/ HTTP/1.1" -
>>>
>>> ==> /var/log/httpd/ssl_access_log <==
>>> 10.5.5.5 - - [13/Mar/2008:10:48:38 -0400] "GET /admin/ HTTP/1.1" 200 -
>>> ----------------------------------------------------
>>>
>>>
>>>
>>>
>>> /home/Perl/Myserver/Handler.pm
>>> ----------------------------------------------------
>>> package Myserver::Handler;
>>>
>>> #Setup some essentials
>>> use strict;         #strict tolerance for code
>>> use Carp;           #debugging
>>> use diagnostics;    #more debugging
>>> use warnings;       #more debugging
>>>
>>> #Handler-related stuff
>>> use Apache2::RequestRec ();
>>> use Apache2::RequestIO ();
>>> use Apache2::Const -compile => qw(OK);
>>>
>>> sub handler {
>>>     my $self        = shift;
>>>     
>>>     my $view        = Myserver::View->new();
>>>     $view->mainpage;
>>>
>>>     # Obligatory stuff for the handler
>>>     $self->content_type('text/html');
>>>     return Apache2::Const::OK;
>>>
>>> }
>>>
>>> 1;
>>>
>>> ----------------------------------------------------
>>>
>>>
>>>
>>>
>>> /home/Perl/Myserver/View.pm:
>>> ----------------------------------------------------
>>> package Myserver::View;
>>>
>>> #Setup some essentials
>>> use strict;         #strict tolerance for code
>>> use Carp;           #debugging
>>> use diagnostics;    #more debugging
>>> use warnings;       #more debugging
>>>
>>> #Loadup some needed functions
>>> use HTML::Template;
>>>
>>> sub new {
>>>     my $self        = shift;
>>>     return $self;
>>> }
>>>
>>> sub mainpage {
>>>     my $self        = shift;
>>>     my $template    = HTML::Template->new(
>>> 		filename => '/home/Perl/tmpl/mainpage.tmpl',
>>>                 cache => 1,
>>>                 debug => 1,
>>>                 stack_debug => 1 );
>>>     print "Content-Type: text/html\n\n";
>>>     print $template->output;
>>>     return $self;
>>> }
>>>
>>> 1;
>>> ----------------------------------------------------
>>>
>>>
>>>
>>>
>>> /home/Perl/tmpl/mainpage.tmpl:
>>> ----------------------------------------------------
>>> <html><body bgcolor="#FF00FF">Test!</body></html>
>>> ----------------------------------------------------
>>>
>>>
>>>
>>>
>>> /home/Perl/tests/View_mainpage.pl
>>> ----------------------------------------------------
>>> #!/usr/bin/perl -w
>>>
>>> # Test printing of the main page
>>> print "Main Page..";
>>>
>>> #Let's load the view module
>>> use lib "../";
>>> use Myserver::View;
>>> #Now let's load some things that are very handy
>>> use strict;         #strict tolerance for code
>>> use Carp;           #debugging
>>> use warnings;       #more debugging
>>> use diagnostics;    #even more debugging
>>>
>>> # Let's create an object
>>> my $view        = Myserver::View->new;
>>>
>>> # Now, let's tell View to display the main page
>>> $view->mainpage;
>>>
>>> print ".OK";
>>>
>>> 1;
>>> ----------------------------------------------------
>>>
>>>
>>>
>>>
>>> On Thu, 2008-03-13 at 13:29 +0800, Foo JH wrote:
>>>> try print $template->output;
>>>>
>>>> You forgot the print();
>>>>
>>>> xyon wrote:
>>>>> Hey everyone,
>>>>>
>>>>> Firstly, I apologize I sent the previous email under an incorrect subject line.
>>>>>
>>>>> I am working on my first Object-Oriented project, and have hit a slight
>>>>> snag. I am using HTML::Template to output within the View module, but it
>>>>> never outputs. I don't see any errors in the logs, I just get a blank
>>>>> page. Below is pertinent information including a test script with its
>>>>> output:
>>>>>
>>>>>
>>>>>
>>>>> OS Info:
>>>>> ----------------------------------------------------
>>>>> CentOS release 4.6 (Final)
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>> Package info:
>>>>> ----------------------------------------------------
>>>>> perl-5.8.8-11
>>>>> perl-HTML-Template-2.9-1
>>>>> httpd-2.0.59-1.el4s1.10.el4.centos
>>>>> mod_perl-2.0.3-1.el4s1.3
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>> /home/perl/Myserver/View.pm
>>>>> ----------------------------------------------------
>>>>> package Myserver::View;
>>>>>
>>>>> #Setup some essentials
>>>>> use strict;         #strict tolerance for code
>>>>> use Carp;           #debugging
>>>>> use diagnostics;    #more debugging
>>>>> use warnings;       #more debugging
>>>>>
>>>>> #Loadup some needed functions
>>>>> use HTML::Template;
>>>>>
>>>>> sub new {
>>>>>     my $self        = shift;
>>>>>     return $self;
>>>>> }
>>>>>
>>>>> sub mainpage {
>>>>>     my $self        = shift;
>>>>>     my $template    = HTML::Template->new( filename =>
>>>>> '/home/Perl/tmpl/mainpage.tmpl',
>>>>>             cache => 1,
>>>>>             debug => 1, 
>>>>>             stack_debug => 1 );
>>>>>     print "Content-Type: text/html\n\n";
>>>>>     $template->output;
>>>>>     return $self;
>>>>> }
>>>>>
>>>>> 1;
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>> /home/Perl/tests/View_mainpage.pl
>>>>> ----------------------------------------------------
>>>>> #!/usr/bin/perl -w
>>>>>
>>>>> # Test printing of the main page
>>>>> print "Main Page..";
>>>>>
>>>>> #Let's load the view module
>>>>> use lib "../";
>>>>> use Myserver::View;
>>>>> #Now let's load some things that are very handy
>>>>> use strict;         #strict tolerance for code
>>>>> use Carp;           #debugging
>>>>> use warnings;       #more debugging
>>>>> use diagnostics;    #even more debugging
>>>>>
>>>>> # Let's create an object
>>>>> my $view        = Myserver::View->new;
>>>>>
>>>>> # Now, let's tell View to display the main page
>>>>> $view->mainpage;
>>>>>
>>>>> print ".OK";
>>>>>
>>>>> 1;
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>> /home/Perl/tmpl/mainpage.tmpl:
>>>>> ----------------------------------------------------
>>>>> <html><body bgcolor="#FF00FF">Test!</body></html>
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>> Output with debugging on (as above):
>>>>> ----------------------------------------------------
>>>>> $ tests/View_mainpage.pl 
>>>>> ### HTML::Template Debug ### In _parse:
>>>>> ### HTML::Template _param Stack Dump ###
>>>>>
>>>>> $VAR1 = [
>>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
>>>>> '
>>>>>         ];
>>>>>
>>>>> Main Page..Content-Type: text/html
>>>>>
>>>>> ### HTML::Template Debug ### In output
>>>>> ### HTML::Template output Stack Dump ###
>>>>>
>>>>> $VAR1 = [
>>>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
>>>>> '
>>>>>         ];
>>>>>
>>>>> .OK
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>> Output without debugging:
>>>>> ----------------------------------------------------
>>>>> $ tests/View_mainpage.pl 
>>>>> Main Page..Content-Type: text/html
>>>>>
>>>>> .OK
>>>>> ----------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>   
> 
>

Re: Custom Object-Oriented Module using HTML::Template

Posted by xyon <xy...@indigorobot.com>.

Just for clarity's sake, here is the test script command and output:

-------------------------------------------------------------------
$ tests/View_mainpage.pl 
### HTML::Template Debug ### In _parse:
### HTML::Template _param Stack Dump ###

$VAR1 = [
          \'<html><body bgcolor="#FF00FF">Test!</body></html>
'
        ];

### HTML::Template Debug ### In output
### HTML::Template output Stack Dump ###

$VAR1 = [
          \'<html><body bgcolor="#FF00FF">Test!</body></html>
'
        ];

Main Page..<html><body bgcolor="#FF00FF">Test!</body></html>

-------------------------------------------------------------------


On Thu, 2008-03-13 at 11:26 -0400, xyon wrote:
> Thanks for the reply.
> 
> I thought as you did (that there were too many "Content-Type"
> definitions), so commented out this line in the View.pm module, but that
> doesn't seem to have changed anything:
> 
> 'print "Content-Type: text/html\n\n";'
> 
> 
> 
> 
> Here is the lwp command and output:
> -------------------------------------------------------------------
> $ lwp-request -e -S -s -U -m GET -Sed "http://localhost/admin/"
> GET http://localhost/admin/
> User-Agent: lwp-request/2.07
> 
> GET http://localhost/admin/ --> 200 OK
> Connection: close
> Date: Thu, 13 Mar 2008 15:24:23 GMT
> Server: Apache
> Content-Length: 0
> Content-Type: text/html; charset=UTF-8
> Client-Date: Thu, 13 Mar 2008 15:24:23 GMT
> Client-Peer: 127.0.0.1:80
> Client-Response-Num: 1
> -------------------------------------------------------------------
> 
> 
> On Thu, 2008-03-13 at 16:11 +0100, André Warnier wrote:
> > Hi.
> > 
> > First, a small disgression : along with perl, comes a beautiful test 
> > tool for HTTP stuff, called "lwp-request".
> > Like, at the command-line :
> > lwp-request  (to see the options)
> > lwp-request -m GET -Sed "http://myserver/myURL"
> > (that will show you what you get as a response, without a browser 
> > getting in the way)
> > 
> > Then, below, are you not now sending one "Content-type" too many ?
> > It looks like you are doing it once in handler(), and once in mainpage().
> > 
> > André
> > 
> > xyon wrote:
> > > That worked great with the test script ( print $template->output; ), but
> > > unfortunately, I'm having trouble getting the display onto a web page
> > > (via the Handler). The resulting web page is blank, with no source.
> > > 
> > > 
> > > Below are my Apache configs for the handler, logs, and the handler and
> > > view module's latest code. I've also included the test script code, just
> > > in case there is some obvious reason it would work and the handler
> > > won't.
> > > 
> > > 
> > > 
> > > 
> > > Apache config:
> > > ----------------------------------------------------
> > > PerlRequire /etc/httpd/perl/startup.pl
> > > <Location /admin>
> > >     SetHandler modperl 
> > >     PerlResponseHandler Myserver::Handler
> > > </Location>
> > > ----------------------------------------------------
> > > 
> > > 
> > > 
> > > 
> > > /etc/httpd/perl/startup.pl:
> > > ----------------------------------------------------
> > > use lib qw(/home/Perl/);
> > > 1;
> > > ----------------------------------------------------
> > > 
> > > 
> > > 
> > > 
> > > Apache log:
> > > ----------------------------------------------------
> > > ==> /var/log/httpd/error_log <==
> > > ### HTML::Template Debug ### In _parse:
> > > ### HTML::Template _param Stack Dump ###
> > > 
> > > $VAR1 = [
> > >           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > > '
> > >         ];
> > > 
> > > ### HTML::Template Debug ### In output
> > > ### HTML::Template output Stack Dump ###
> > > 
> > > $VAR1 = [
> > >           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > > '
> > >         ];
> > > 
> > > 
> > > ==> /var/log/httpd/ssl_request_log <==
> > > [13/Mar/2008:10:48:38 -0400] 10.5.5.5 TLSv1 DHE-RSA-AES256-SHA
> > > "GET /admin/ HTTP/1.1" -
> > > 
> > > ==> /var/log/httpd/ssl_access_log <==
> > > 10.5.5.5 - - [13/Mar/2008:10:48:38 -0400] "GET /admin/ HTTP/1.1" 200 -
> > > ----------------------------------------------------
> > > 
> > > 
> > > 
> > > 
> > > /home/Perl/Myserver/Handler.pm
> > > ----------------------------------------------------
> > > package Myserver::Handler;
> > > 
> > > #Setup some essentials
> > > use strict;         #strict tolerance for code
> > > use Carp;           #debugging
> > > use diagnostics;    #more debugging
> > > use warnings;       #more debugging
> > > 
> > > #Handler-related stuff
> > > use Apache2::RequestRec ();
> > > use Apache2::RequestIO ();
> > > use Apache2::Const -compile => qw(OK);
> > > 
> > > sub handler {
> > >     my $self        = shift;
> > >     
> > >     my $view        = Myserver::View->new();
> > >     $view->mainpage;
> > > 
> > >     # Obligatory stuff for the handler
> > >     $self->content_type('text/html');
> > >     return Apache2::Const::OK;
> > > 
> > > }
> > > 
> > > 1;
> > > 
> > > ----------------------------------------------------
> > > 
> > > 
> > > 
> > > 
> > > /home/Perl/Myserver/View.pm:
> > > ----------------------------------------------------
> > > package Myserver::View;
> > > 
> > > #Setup some essentials
> > > use strict;         #strict tolerance for code
> > > use Carp;           #debugging
> > > use diagnostics;    #more debugging
> > > use warnings;       #more debugging
> > > 
> > > #Loadup some needed functions
> > > use HTML::Template;
> > > 
> > > sub new {
> > >     my $self        = shift;
> > >     return $self;
> > > }
> > > 
> > > sub mainpage {
> > >     my $self        = shift;
> > >     my $template    = HTML::Template->new(
> > > 		filename => '/home/Perl/tmpl/mainpage.tmpl',
> > >                 cache => 1,
> > >                 debug => 1,
> > >                 stack_debug => 1 );
> > >     print "Content-Type: text/html\n\n";
> > >     print $template->output;
> > >     return $self;
> > > }
> > > 
> > > 1;
> > > ----------------------------------------------------
> > > 
> > > 
> > > 
> > > 
> > > /home/Perl/tmpl/mainpage.tmpl:
> > > ----------------------------------------------------
> > > <html><body bgcolor="#FF00FF">Test!</body></html>
> > > ----------------------------------------------------
> > > 
> > > 
> > > 
> > > 
> > > /home/Perl/tests/View_mainpage.pl
> > > ----------------------------------------------------
> > > #!/usr/bin/perl -w
> > > 
> > > # Test printing of the main page
> > > print "Main Page..";
> > > 
> > > #Let's load the view module
> > > use lib "../";
> > > use Myserver::View;
> > > #Now let's load some things that are very handy
> > > use strict;         #strict tolerance for code
> > > use Carp;           #debugging
> > > use warnings;       #more debugging
> > > use diagnostics;    #even more debugging
> > > 
> > > # Let's create an object
> > > my $view        = Myserver::View->new;
> > > 
> > > # Now, let's tell View to display the main page
> > > $view->mainpage;
> > > 
> > > print ".OK";
> > > 
> > > 1;
> > > ----------------------------------------------------
> > > 
> > > 
> > > 
> > > 
> > > On Thu, 2008-03-13 at 13:29 +0800, Foo JH wrote:
> > >> try print $template->output;
> > >>
> > >> You forgot the print();
> > >>
> > >> xyon wrote:
> > >>> Hey everyone,
> > >>>
> > >>> Firstly, I apologize I sent the previous email under an incorrect subject line.
> > >>>
> > >>> I am working on my first Object-Oriented project, and have hit a slight
> > >>> snag. I am using HTML::Template to output within the View module, but it
> > >>> never outputs. I don't see any errors in the logs, I just get a blank
> > >>> page. Below is pertinent information including a test script with its
> > >>> output:
> > >>>
> > >>>
> > >>>
> > >>> OS Info:
> > >>> ----------------------------------------------------
> > >>> CentOS release 4.6 (Final)
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>> Package info:
> > >>> ----------------------------------------------------
> > >>> perl-5.8.8-11
> > >>> perl-HTML-Template-2.9-1
> > >>> httpd-2.0.59-1.el4s1.10.el4.centos
> > >>> mod_perl-2.0.3-1.el4s1.3
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>> /home/perl/Myserver/View.pm
> > >>> ----------------------------------------------------
> > >>> package Myserver::View;
> > >>>
> > >>> #Setup some essentials
> > >>> use strict;         #strict tolerance for code
> > >>> use Carp;           #debugging
> > >>> use diagnostics;    #more debugging
> > >>> use warnings;       #more debugging
> > >>>
> > >>> #Loadup some needed functions
> > >>> use HTML::Template;
> > >>>
> > >>> sub new {
> > >>>     my $self        = shift;
> > >>>     return $self;
> > >>> }
> > >>>
> > >>> sub mainpage {
> > >>>     my $self        = shift;
> > >>>     my $template    = HTML::Template->new( filename =>
> > >>> '/home/Perl/tmpl/mainpage.tmpl',
> > >>>             cache => 1,
> > >>>             debug => 1, 
> > >>>             stack_debug => 1 );
> > >>>     print "Content-Type: text/html\n\n";
> > >>>     $template->output;
> > >>>     return $self;
> > >>> }
> > >>>
> > >>> 1;
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>> /home/Perl/tests/View_mainpage.pl
> > >>> ----------------------------------------------------
> > >>> #!/usr/bin/perl -w
> > >>>
> > >>> # Test printing of the main page
> > >>> print "Main Page..";
> > >>>
> > >>> #Let's load the view module
> > >>> use lib "../";
> > >>> use Myserver::View;
> > >>> #Now let's load some things that are very handy
> > >>> use strict;         #strict tolerance for code
> > >>> use Carp;           #debugging
> > >>> use warnings;       #more debugging
> > >>> use diagnostics;    #even more debugging
> > >>>
> > >>> # Let's create an object
> > >>> my $view        = Myserver::View->new;
> > >>>
> > >>> # Now, let's tell View to display the main page
> > >>> $view->mainpage;
> > >>>
> > >>> print ".OK";
> > >>>
> > >>> 1;
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>> /home/Perl/tmpl/mainpage.tmpl:
> > >>> ----------------------------------------------------
> > >>> <html><body bgcolor="#FF00FF">Test!</body></html>
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>> Output with debugging on (as above):
> > >>> ----------------------------------------------------
> > >>> $ tests/View_mainpage.pl 
> > >>> ### HTML::Template Debug ### In _parse:
> > >>> ### HTML::Template _param Stack Dump ###
> > >>>
> > >>> $VAR1 = [
> > >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > >>> '
> > >>>         ];
> > >>>
> > >>> Main Page..Content-Type: text/html
> > >>>
> > >>> ### HTML::Template Debug ### In output
> > >>> ### HTML::Template output Stack Dump ###
> > >>>
> > >>> $VAR1 = [
> > >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > >>> '
> > >>>         ];
> > >>>
> > >>> .OK
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>> Output without debugging:
> > >>> ----------------------------------------------------
> > >>> $ tests/View_mainpage.pl 
> > >>> Main Page..Content-Type: text/html
> > >>>
> > >>> .OK
> > >>> ----------------------------------------------------
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>   
> > >

Re: Custom Object-Oriented Module using HTML::Template

Posted by xyon <xy...@indigorobot.com>.

Thanks for the reply.

I thought as you did (that there were too many "Content-Type"
definitions), so commented out this line in the View.pm module, but that
doesn't seem to have changed anything:

'print "Content-Type: text/html\n\n";'




Here is the lwp command and output:
-------------------------------------------------------------------
$ lwp-request -e -S -s -U -m GET -Sed "http://localhost/admin/"
GET http://localhost/admin/
User-Agent: lwp-request/2.07

GET http://localhost/admin/ --> 200 OK
Connection: close
Date: Thu, 13 Mar 2008 15:24:23 GMT
Server: Apache
Content-Length: 0
Content-Type: text/html; charset=UTF-8
Client-Date: Thu, 13 Mar 2008 15:24:23 GMT
Client-Peer: 127.0.0.1:80
Client-Response-Num: 1
-------------------------------------------------------------------


On Thu, 2008-03-13 at 16:11 +0100, André Warnier wrote:
> Hi.
> 
> First, a small disgression : along with perl, comes a beautiful test 
> tool for HTTP stuff, called "lwp-request".
> Like, at the command-line :
> lwp-request  (to see the options)
> lwp-request -m GET -Sed "http://myserver/myURL"
> (that will show you what you get as a response, without a browser 
> getting in the way)
> 
> Then, below, are you not now sending one "Content-type" too many ?
> It looks like you are doing it once in handler(), and once in mainpage().
> 
> André
> 
> xyon wrote:
> > That worked great with the test script ( print $template->output; ), but
> > unfortunately, I'm having trouble getting the display onto a web page
> > (via the Handler). The resulting web page is blank, with no source.
> > 
> > 
> > Below are my Apache configs for the handler, logs, and the handler and
> > view module's latest code. I've also included the test script code, just
> > in case there is some obvious reason it would work and the handler
> > won't.
> > 
> > 
> > 
> > 
> > Apache config:
> > ----------------------------------------------------
> > PerlRequire /etc/httpd/perl/startup.pl
> > <Location /admin>
> >     SetHandler modperl 
> >     PerlResponseHandler Myserver::Handler
> > </Location>
> > ----------------------------------------------------
> > 
> > 
> > 
> > 
> > /etc/httpd/perl/startup.pl:
> > ----------------------------------------------------
> > use lib qw(/home/Perl/);
> > 1;
> > ----------------------------------------------------
> > 
> > 
> > 
> > 
> > Apache log:
> > ----------------------------------------------------
> > ==> /var/log/httpd/error_log <==
> > ### HTML::Template Debug ### In _parse:
> > ### HTML::Template _param Stack Dump ###
> > 
> > $VAR1 = [
> >           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > '
> >         ];
> > 
> > ### HTML::Template Debug ### In output
> > ### HTML::Template output Stack Dump ###
> > 
> > $VAR1 = [
> >           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > '
> >         ];
> > 
> > 
> > ==> /var/log/httpd/ssl_request_log <==
> > [13/Mar/2008:10:48:38 -0400] 10.5.5.5 TLSv1 DHE-RSA-AES256-SHA
> > "GET /admin/ HTTP/1.1" -
> > 
> > ==> /var/log/httpd/ssl_access_log <==
> > 10.5.5.5 - - [13/Mar/2008:10:48:38 -0400] "GET /admin/ HTTP/1.1" 200 -
> > ----------------------------------------------------
> > 
> > 
> > 
> > 
> > /home/Perl/Myserver/Handler.pm
> > ----------------------------------------------------
> > package Myserver::Handler;
> > 
> > #Setup some essentials
> > use strict;         #strict tolerance for code
> > use Carp;           #debugging
> > use diagnostics;    #more debugging
> > use warnings;       #more debugging
> > 
> > #Handler-related stuff
> > use Apache2::RequestRec ();
> > use Apache2::RequestIO ();
> > use Apache2::Const -compile => qw(OK);
> > 
> > sub handler {
> >     my $self        = shift;
> >     
> >     my $view        = Myserver::View->new();
> >     $view->mainpage;
> > 
> >     # Obligatory stuff for the handler
> >     $self->content_type('text/html');
> >     return Apache2::Const::OK;
> > 
> > }
> > 
> > 1;
> > 
> > ----------------------------------------------------
> > 
> > 
> > 
> > 
> > /home/Perl/Myserver/View.pm:
> > ----------------------------------------------------
> > package Myserver::View;
> > 
> > #Setup some essentials
> > use strict;         #strict tolerance for code
> > use Carp;           #debugging
> > use diagnostics;    #more debugging
> > use warnings;       #more debugging
> > 
> > #Loadup some needed functions
> > use HTML::Template;
> > 
> > sub new {
> >     my $self        = shift;
> >     return $self;
> > }
> > 
> > sub mainpage {
> >     my $self        = shift;
> >     my $template    = HTML::Template->new(
> > 		filename => '/home/Perl/tmpl/mainpage.tmpl',
> >                 cache => 1,
> >                 debug => 1,
> >                 stack_debug => 1 );
> >     print "Content-Type: text/html\n\n";
> >     print $template->output;
> >     return $self;
> > }
> > 
> > 1;
> > ----------------------------------------------------
> > 
> > 
> > 
> > 
> > /home/Perl/tmpl/mainpage.tmpl:
> > ----------------------------------------------------
> > <html><body bgcolor="#FF00FF">Test!</body></html>
> > ----------------------------------------------------
> > 
> > 
> > 
> > 
> > /home/Perl/tests/View_mainpage.pl
> > ----------------------------------------------------
> > #!/usr/bin/perl -w
> > 
> > # Test printing of the main page
> > print "Main Page..";
> > 
> > #Let's load the view module
> > use lib "../";
> > use Myserver::View;
> > #Now let's load some things that are very handy
> > use strict;         #strict tolerance for code
> > use Carp;           #debugging
> > use warnings;       #more debugging
> > use diagnostics;    #even more debugging
> > 
> > # Let's create an object
> > my $view        = Myserver::View->new;
> > 
> > # Now, let's tell View to display the main page
> > $view->mainpage;
> > 
> > print ".OK";
> > 
> > 1;
> > ----------------------------------------------------
> > 
> > 
> > 
> > 
> > On Thu, 2008-03-13 at 13:29 +0800, Foo JH wrote:
> >> try print $template->output;
> >>
> >> You forgot the print();
> >>
> >> xyon wrote:
> >>> Hey everyone,
> >>>
> >>> Firstly, I apologize I sent the previous email under an incorrect subject line.
> >>>
> >>> I am working on my first Object-Oriented project, and have hit a slight
> >>> snag. I am using HTML::Template to output within the View module, but it
> >>> never outputs. I don't see any errors in the logs, I just get a blank
> >>> page. Below is pertinent information including a test script with its
> >>> output:
> >>>
> >>>
> >>>
> >>> OS Info:
> >>> ----------------------------------------------------
> >>> CentOS release 4.6 (Final)
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>> Package info:
> >>> ----------------------------------------------------
> >>> perl-5.8.8-11
> >>> perl-HTML-Template-2.9-1
> >>> httpd-2.0.59-1.el4s1.10.el4.centos
> >>> mod_perl-2.0.3-1.el4s1.3
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>> /home/perl/Myserver/View.pm
> >>> ----------------------------------------------------
> >>> package Myserver::View;
> >>>
> >>> #Setup some essentials
> >>> use strict;         #strict tolerance for code
> >>> use Carp;           #debugging
> >>> use diagnostics;    #more debugging
> >>> use warnings;       #more debugging
> >>>
> >>> #Loadup some needed functions
> >>> use HTML::Template;
> >>>
> >>> sub new {
> >>>     my $self        = shift;
> >>>     return $self;
> >>> }
> >>>
> >>> sub mainpage {
> >>>     my $self        = shift;
> >>>     my $template    = HTML::Template->new( filename =>
> >>> '/home/Perl/tmpl/mainpage.tmpl',
> >>>             cache => 1,
> >>>             debug => 1, 
> >>>             stack_debug => 1 );
> >>>     print "Content-Type: text/html\n\n";
> >>>     $template->output;
> >>>     return $self;
> >>> }
> >>>
> >>> 1;
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>> /home/Perl/tests/View_mainpage.pl
> >>> ----------------------------------------------------
> >>> #!/usr/bin/perl -w
> >>>
> >>> # Test printing of the main page
> >>> print "Main Page..";
> >>>
> >>> #Let's load the view module
> >>> use lib "../";
> >>> use Myserver::View;
> >>> #Now let's load some things that are very handy
> >>> use strict;         #strict tolerance for code
> >>> use Carp;           #debugging
> >>> use warnings;       #more debugging
> >>> use diagnostics;    #even more debugging
> >>>
> >>> # Let's create an object
> >>> my $view        = Myserver::View->new;
> >>>
> >>> # Now, let's tell View to display the main page
> >>> $view->mainpage;
> >>>
> >>> print ".OK";
> >>>
> >>> 1;
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>> /home/Perl/tmpl/mainpage.tmpl:
> >>> ----------------------------------------------------
> >>> <html><body bgcolor="#FF00FF">Test!</body></html>
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>> Output with debugging on (as above):
> >>> ----------------------------------------------------
> >>> $ tests/View_mainpage.pl 
> >>> ### HTML::Template Debug ### In _parse:
> >>> ### HTML::Template _param Stack Dump ###
> >>>
> >>> $VAR1 = [
> >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> >>> '
> >>>         ];
> >>>
> >>> Main Page..Content-Type: text/html
> >>>
> >>> ### HTML::Template Debug ### In output
> >>> ### HTML::Template output Stack Dump ###
> >>>
> >>> $VAR1 = [
> >>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> >>> '
> >>>         ];
> >>>
> >>> .OK
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>> Output without debugging:
> >>> ----------------------------------------------------
> >>> $ tests/View_mainpage.pl 
> >>> Main Page..Content-Type: text/html
> >>>
> >>> .OK
> >>> ----------------------------------------------------
> >>>
> >>>
> >>>
> >>>
> >>>   
> >

Re: Custom Object-Oriented Module using HTML::Template

Posted by André Warnier <aw...@ice-sa.com>.

Hi.

First, a small disgression : along with perl, comes a beautiful test 
tool for HTTP stuff, called "lwp-request".
Like, at the command-line :
lwp-request  (to see the options)
lwp-request -m GET -Sed "http://myserver/myURL"
(that will show you what you get as a response, without a browser 
getting in the way)

Then, below, are you not now sending one "Content-type" too many ?
It looks like you are doing it once in handler(), and once in mainpage().

André

xyon wrote:
> That worked great with the test script ( print $template->output; ), but
> unfortunately, I'm having trouble getting the display onto a web page
> (via the Handler). The resulting web page is blank, with no source.
> 
> 
> Below are my Apache configs for the handler, logs, and the handler and
> view module's latest code. I've also included the test script code, just
> in case there is some obvious reason it would work and the handler
> won't.
> 
> 
> 
> 
> Apache config:
> ----------------------------------------------------
> PerlRequire /etc/httpd/perl/startup.pl
> <Location /admin>
>     SetHandler modperl 
>     PerlResponseHandler Myserver::Handler
> </Location>
> ----------------------------------------------------
> 
> 
> 
> 
> /etc/httpd/perl/startup.pl:
> ----------------------------------------------------
> use lib qw(/home/Perl/);
> 1;
> ----------------------------------------------------
> 
> 
> 
> 
> Apache log:
> ----------------------------------------------------
> ==> /var/log/httpd/error_log <==
> ### HTML::Template Debug ### In _parse:
> ### HTML::Template _param Stack Dump ###
> 
> $VAR1 = [
>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> '
>         ];
> 
> ### HTML::Template Debug ### In output
> ### HTML::Template output Stack Dump ###
> 
> $VAR1 = [
>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> '
>         ];
> 
> 
> ==> /var/log/httpd/ssl_request_log <==
> [13/Mar/2008:10:48:38 -0400] 10.5.5.5 TLSv1 DHE-RSA-AES256-SHA
> "GET /admin/ HTTP/1.1" -
> 
> ==> /var/log/httpd/ssl_access_log <==
> 10.5.5.5 - - [13/Mar/2008:10:48:38 -0400] "GET /admin/ HTTP/1.1" 200 -
> ----------------------------------------------------
> 
> 
> 
> 
> /home/Perl/Myserver/Handler.pm
> ----------------------------------------------------
> package Myserver::Handler;
> 
> #Setup some essentials
> use strict;         #strict tolerance for code
> use Carp;           #debugging
> use diagnostics;    #more debugging
> use warnings;       #more debugging
> 
> #Handler-related stuff
> use Apache2::RequestRec ();
> use Apache2::RequestIO ();
> use Apache2::Const -compile => qw(OK);
> 
> sub handler {
>     my $self        = shift;
>     
>     my $view        = Myserver::View->new();
>     $view->mainpage;
> 
>     # Obligatory stuff for the handler
>     $self->content_type('text/html');
>     return Apache2::Const::OK;
> 
> }
> 
> 1;
> 
> ----------------------------------------------------
> 
> 
> 
> 
> /home/Perl/Myserver/View.pm:
> ----------------------------------------------------
> package Myserver::View;
> 
> #Setup some essentials
> use strict;         #strict tolerance for code
> use Carp;           #debugging
> use diagnostics;    #more debugging
> use warnings;       #more debugging
> 
> #Loadup some needed functions
> use HTML::Template;
> 
> sub new {
>     my $self        = shift;
>     return $self;
> }
> 
> sub mainpage {
>     my $self        = shift;
>     my $template    = HTML::Template->new(
> 		filename => '/home/Perl/tmpl/mainpage.tmpl',
>                 cache => 1,
>                 debug => 1,
>                 stack_debug => 1 );
>     print "Content-Type: text/html\n\n";
>     print $template->output;
>     return $self;
> }
> 
> 1;
> ----------------------------------------------------
> 
> 
> 
> 
> /home/Perl/tmpl/mainpage.tmpl:
> ----------------------------------------------------
> <html><body bgcolor="#FF00FF">Test!</body></html>
> ----------------------------------------------------
> 
> 
> 
> 
> /home/Perl/tests/View_mainpage.pl
> ----------------------------------------------------
> #!/usr/bin/perl -w
> 
> # Test printing of the main page
> print "Main Page..";
> 
> #Let's load the view module
> use lib "../";
> use Myserver::View;
> #Now let's load some things that are very handy
> use strict;         #strict tolerance for code
> use Carp;           #debugging
> use warnings;       #more debugging
> use diagnostics;    #even more debugging
> 
> # Let's create an object
> my $view        = Myserver::View->new;
> 
> # Now, let's tell View to display the main page
> $view->mainpage;
> 
> print ".OK";
> 
> 1;
> ----------------------------------------------------
> 
> 
> 
> 
> On Thu, 2008-03-13 at 13:29 +0800, Foo JH wrote:
>> try print $template->output;
>>
>> You forgot the print();
>>
>> xyon wrote:
>>> Hey everyone,
>>>
>>> Firstly, I apologize I sent the previous email under an incorrect subject line.
>>>
>>> I am working on my first Object-Oriented project, and have hit a slight
>>> snag. I am using HTML::Template to output within the View module, but it
>>> never outputs. I don't see any errors in the logs, I just get a blank
>>> page. Below is pertinent information including a test script with its
>>> output:
>>>
>>>
>>>
>>> OS Info:
>>> ----------------------------------------------------
>>> CentOS release 4.6 (Final)
>>> ----------------------------------------------------
>>>
>>>
>>>
>>> Package info:
>>> ----------------------------------------------------
>>> perl-5.8.8-11
>>> perl-HTML-Template-2.9-1
>>> httpd-2.0.59-1.el4s1.10.el4.centos
>>> mod_perl-2.0.3-1.el4s1.3
>>> ----------------------------------------------------
>>>
>>>
>>>
>>> /home/perl/Myserver/View.pm
>>> ----------------------------------------------------
>>> package Myserver::View;
>>>
>>> #Setup some essentials
>>> use strict;         #strict tolerance for code
>>> use Carp;           #debugging
>>> use diagnostics;    #more debugging
>>> use warnings;       #more debugging
>>>
>>> #Loadup some needed functions
>>> use HTML::Template;
>>>
>>> sub new {
>>>     my $self        = shift;
>>>     return $self;
>>> }
>>>
>>> sub mainpage {
>>>     my $self        = shift;
>>>     my $template    = HTML::Template->new( filename =>
>>> '/home/Perl/tmpl/mainpage.tmpl',
>>>             cache => 1,
>>>             debug => 1, 
>>>             stack_debug => 1 );
>>>     print "Content-Type: text/html\n\n";
>>>     $template->output;
>>>     return $self;
>>> }
>>>
>>> 1;
>>> ----------------------------------------------------
>>>
>>>
>>>
>>> /home/Perl/tests/View_mainpage.pl
>>> ----------------------------------------------------
>>> #!/usr/bin/perl -w
>>>
>>> # Test printing of the main page
>>> print "Main Page..";
>>>
>>> #Let's load the view module
>>> use lib "../";
>>> use Myserver::View;
>>> #Now let's load some things that are very handy
>>> use strict;         #strict tolerance for code
>>> use Carp;           #debugging
>>> use warnings;       #more debugging
>>> use diagnostics;    #even more debugging
>>>
>>> # Let's create an object
>>> my $view        = Myserver::View->new;
>>>
>>> # Now, let's tell View to display the main page
>>> $view->mainpage;
>>>
>>> print ".OK";
>>>
>>> 1;
>>> ----------------------------------------------------
>>>
>>>
>>>
>>> /home/Perl/tmpl/mainpage.tmpl:
>>> ----------------------------------------------------
>>> <html><body bgcolor="#FF00FF">Test!</body></html>
>>> ----------------------------------------------------
>>>
>>>
>>>
>>> Output with debugging on (as above):
>>> ----------------------------------------------------
>>> $ tests/View_mainpage.pl 
>>> ### HTML::Template Debug ### In _parse:
>>> ### HTML::Template _param Stack Dump ###
>>>
>>> $VAR1 = [
>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
>>> '
>>>         ];
>>>
>>> Main Page..Content-Type: text/html
>>>
>>> ### HTML::Template Debug ### In output
>>> ### HTML::Template output Stack Dump ###
>>>
>>> $VAR1 = [
>>>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
>>> '
>>>         ];
>>>
>>> .OK
>>> ----------------------------------------------------
>>>
>>>
>>>
>>> Output without debugging:
>>> ----------------------------------------------------
>>> $ tests/View_mainpage.pl 
>>> Main Page..Content-Type: text/html
>>>
>>> .OK
>>> ----------------------------------------------------
>>>
>>>
>>>
>>>
>>>   
>

Re: Custom Object-Oriented Module using HTML::Template

Posted by xyon <xy...@indigorobot.com>.

That worked great with the test script ( print $template->output; ), but
unfortunately, I'm having trouble getting the display onto a web page
(via the Handler). The resulting web page is blank, with no source.


Below are my Apache configs for the handler, logs, and the handler and
view module's latest code. I've also included the test script code, just
in case there is some obvious reason it would work and the handler
won't.




Apache config:
----------------------------------------------------
PerlRequire /etc/httpd/perl/startup.pl
<Location /admin>
    SetHandler modperl 
    PerlResponseHandler Myserver::Handler
</Location>
----------------------------------------------------




/etc/httpd/perl/startup.pl:
----------------------------------------------------
use lib qw(/home/Perl/);
1;
----------------------------------------------------




Apache log:
----------------------------------------------------
==> /var/log/httpd/error_log <==
### HTML::Template Debug ### In _parse:
### HTML::Template _param Stack Dump ###

$VAR1 = [
          \'<html><body bgcolor="#FF00FF">Test!</body></html>
'
        ];

### HTML::Template Debug ### In output
### HTML::Template output Stack Dump ###

$VAR1 = [
          \'<html><body bgcolor="#FF00FF">Test!</body></html>
'
        ];


==> /var/log/httpd/ssl_request_log <==
[13/Mar/2008:10:48:38 -0400] 10.5.5.5 TLSv1 DHE-RSA-AES256-SHA
"GET /admin/ HTTP/1.1" -

==> /var/log/httpd/ssl_access_log <==
10.5.5.5 - - [13/Mar/2008:10:48:38 -0400] "GET /admin/ HTTP/1.1" 200 -
----------------------------------------------------




/home/Perl/Myserver/Handler.pm
----------------------------------------------------
package Myserver::Handler;

#Setup some essentials
use strict;         #strict tolerance for code
use Carp;           #debugging
use diagnostics;    #more debugging
use warnings;       #more debugging

#Handler-related stuff
use Apache2::RequestRec ();
use Apache2::RequestIO ();
use Apache2::Const -compile => qw(OK);

sub handler {
    my $self        = shift;
    
    my $view        = Myserver::View->new();
    $view->mainpage;

    # Obligatory stuff for the handler
    $self->content_type('text/html');
    return Apache2::Const::OK;

}

1;

----------------------------------------------------




/home/Perl/Myserver/View.pm:
----------------------------------------------------
package Myserver::View;

#Setup some essentials
use strict;         #strict tolerance for code
use Carp;           #debugging
use diagnostics;    #more debugging
use warnings;       #more debugging

#Loadup some needed functions
use HTML::Template;

sub new {
    my $self        = shift;
    return $self;
}

sub mainpage {
    my $self        = shift;
    my $template    = HTML::Template->new(
		filename => '/home/Perl/tmpl/mainpage.tmpl',
                cache => 1,
                debug => 1,
                stack_debug => 1 );
    print "Content-Type: text/html\n\n";
    print $template->output;
    return $self;
}

1;
----------------------------------------------------




/home/Perl/tmpl/mainpage.tmpl:
----------------------------------------------------
<html><body bgcolor="#FF00FF">Test!</body></html>
----------------------------------------------------




/home/Perl/tests/View_mainpage.pl
----------------------------------------------------
#!/usr/bin/perl -w

# Test printing of the main page
print "Main Page..";

#Let's load the view module
use lib "../";
use Myserver::View;
#Now let's load some things that are very handy
use strict;         #strict tolerance for code
use Carp;           #debugging
use warnings;       #more debugging
use diagnostics;    #even more debugging

# Let's create an object
my $view        = Myserver::View->new;

# Now, let's tell View to display the main page
$view->mainpage;

print ".OK";

1;
----------------------------------------------------




On Thu, 2008-03-13 at 13:29 +0800, Foo JH wrote:
> try print $template->output;
> 
> You forgot the print();
> 
> xyon wrote:
> > Hey everyone,
> >
> > Firstly, I apologize I sent the previous email under an incorrect subject line.
> >
> > I am working on my first Object-Oriented project, and have hit a slight
> > snag. I am using HTML::Template to output within the View module, but it
> > never outputs. I don't see any errors in the logs, I just get a blank
> > page. Below is pertinent information including a test script with its
> > output:
> >
> >
> >
> > OS Info:
> > ----------------------------------------------------
> > CentOS release 4.6 (Final)
> > ----------------------------------------------------
> >
> >
> >
> > Package info:
> > ----------------------------------------------------
> > perl-5.8.8-11
> > perl-HTML-Template-2.9-1
> > httpd-2.0.59-1.el4s1.10.el4.centos
> > mod_perl-2.0.3-1.el4s1.3
> > ----------------------------------------------------
> >
> >
> >
> > /home/perl/Myserver/View.pm
> > ----------------------------------------------------
> > package Myserver::View;
> >
> > #Setup some essentials
> > use strict;         #strict tolerance for code
> > use Carp;           #debugging
> > use diagnostics;    #more debugging
> > use warnings;       #more debugging
> >
> > #Loadup some needed functions
> > use HTML::Template;
> >
> > sub new {
> >     my $self        = shift;
> >     return $self;
> > }
> >
> > sub mainpage {
> >     my $self        = shift;
> >     my $template    = HTML::Template->new( filename =>
> > '/home/Perl/tmpl/mainpage.tmpl',
> >             cache => 1,
> >             debug => 1, 
> >             stack_debug => 1 );
> >     print "Content-Type: text/html\n\n";
> >     $template->output;
> >     return $self;
> > }
> >
> > 1;
> > ----------------------------------------------------
> >
> >
> >
> > /home/Perl/tests/View_mainpage.pl
> > ----------------------------------------------------
> > #!/usr/bin/perl -w
> >
> > # Test printing of the main page
> > print "Main Page..";
> >
> > #Let's load the view module
> > use lib "../";
> > use Myserver::View;
> > #Now let's load some things that are very handy
> > use strict;         #strict tolerance for code
> > use Carp;           #debugging
> > use warnings;       #more debugging
> > use diagnostics;    #even more debugging
> >
> > # Let's create an object
> > my $view        = Myserver::View->new;
> >
> > # Now, let's tell View to display the main page
> > $view->mainpage;
> >
> > print ".OK";
> >
> > 1;
> > ----------------------------------------------------
> >
> >
> >
> > /home/Perl/tmpl/mainpage.tmpl:
> > ----------------------------------------------------
> > <html><body bgcolor="#FF00FF">Test!</body></html>
> > ----------------------------------------------------
> >
> >
> >
> > Output with debugging on (as above):
> > ----------------------------------------------------
> > $ tests/View_mainpage.pl 
> > ### HTML::Template Debug ### In _parse:
> > ### HTML::Template _param Stack Dump ###
> >
> > $VAR1 = [
> >           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > '
> >         ];
> >
> > Main Page..Content-Type: text/html
> >
> > ### HTML::Template Debug ### In output
> > ### HTML::Template output Stack Dump ###
> >
> > $VAR1 = [
> >           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> > '
> >         ];
> >
> > .OK
> > ----------------------------------------------------
> >
> >
> >
> > Output without debugging:
> > ----------------------------------------------------
> > $ tests/View_mainpage.pl 
> > Main Page..Content-Type: text/html
> >
> > .OK
> > ----------------------------------------------------
> >
> >
> >
> >
> >   
>

Re: Custom Object-Oriented Module using HTML::Template

Posted by Foo JH <jh...@extracktor.com>.

try print $template->output;

You forgot the print();

xyon wrote:
> Hey everyone,
>
> Firstly, I apologize I sent the previous email under an incorrect subject line.
>
> I am working on my first Object-Oriented project, and have hit a slight
> snag. I am using HTML::Template to output within the View module, but it
> never outputs. I don't see any errors in the logs, I just get a blank
> page. Below is pertinent information including a test script with its
> output:
>
>
>
> OS Info:
> ----------------------------------------------------
> CentOS release 4.6 (Final)
> ----------------------------------------------------
>
>
>
> Package info:
> ----------------------------------------------------
> perl-5.8.8-11
> perl-HTML-Template-2.9-1
> httpd-2.0.59-1.el4s1.10.el4.centos
> mod_perl-2.0.3-1.el4s1.3
> ----------------------------------------------------
>
>
>
> /home/perl/Myserver/View.pm
> ----------------------------------------------------
> package Myserver::View;
>
> #Setup some essentials
> use strict;         #strict tolerance for code
> use Carp;           #debugging
> use diagnostics;    #more debugging
> use warnings;       #more debugging
>
> #Loadup some needed functions
> use HTML::Template;
>
> sub new {
>     my $self        = shift;
>     return $self;
> }
>
> sub mainpage {
>     my $self        = shift;
>     my $template    = HTML::Template->new( filename =>
> '/home/Perl/tmpl/mainpage.tmpl',
>             cache => 1,
>             debug => 1, 
>             stack_debug => 1 );
>     print "Content-Type: text/html\n\n";
>     $template->output;
>     return $self;
> }
>
> 1;
> ----------------------------------------------------
>
>
>
> /home/Perl/tests/View_mainpage.pl
> ----------------------------------------------------
> #!/usr/bin/perl -w
>
> # Test printing of the main page
> print "Main Page..";
>
> #Let's load the view module
> use lib "../";
> use Myserver::View;
> #Now let's load some things that are very handy
> use strict;         #strict tolerance for code
> use Carp;           #debugging
> use warnings;       #more debugging
> use diagnostics;    #even more debugging
>
> # Let's create an object
> my $view        = Myserver::View->new;
>
> # Now, let's tell View to display the main page
> $view->mainpage;
>
> print ".OK";
>
> 1;
> ----------------------------------------------------
>
>
>
> /home/Perl/tmpl/mainpage.tmpl:
> ----------------------------------------------------
> <html><body bgcolor="#FF00FF">Test!</body></html>
> ----------------------------------------------------
>
>
>
> Output with debugging on (as above):
> ----------------------------------------------------
> $ tests/View_mainpage.pl 
> ### HTML::Template Debug ### In _parse:
> ### HTML::Template _param Stack Dump ###
>
> $VAR1 = [
>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> '
>         ];
>
> Main Page..Content-Type: text/html
>
> ### HTML::Template Debug ### In output
> ### HTML::Template output Stack Dump ###
>
> $VAR1 = [
>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> '
>         ];
>
> .OK
> ----------------------------------------------------
>
>
>
> Output without debugging:
> ----------------------------------------------------
> $ tests/View_mainpage.pl 
> Main Page..Content-Type: text/html
>
> .OK
> ----------------------------------------------------
>
>
>
>
>

Re: Custom Object-Oriented Module using HTML::Template

Posted by "Roberto C. Sánchez" <ro...@connexer.com>.

On Wed, Mar 12, 2008 at 07:58:25PM -0400, Colin Wetherbee wrote:
> Roberto � wrote:
> >On Wed, Mar 12, 2008 at 11:02:27PM +0000, xyon wrote:
> >>Hey everyone,
> >>
> >>Firstly, I apologize I sent the previous email under an incorrect subject 
> >>line.
> >>
> >
> >Yes, but you still hijacked another thread.
> >
> >=> In-Reply-To: <ME...@indigorobot.com>
> >
> >Please don't do that.  Start a new thread by sending a new message to
> >the list.  Don't just repky some random message and change the subject
> >line.
> 
> At least give him credit for showing plenty of diagnostic information. 
> That's something we rarely see with newbies. :)
> 
True.  I apologize for overlooking that.

Regards,

-Roberto

-- 
Roberto C. Sánchez
http://people.connexer.com/~roberto
http://www.connexer.com

Re: Custom Object-Oriented Module using HTML::Template

Posted by Colin Wetherbee <cw...@denterprises.org>.

Roberto � wrote:
> On Wed, Mar 12, 2008 at 11:02:27PM +0000, xyon wrote:
>> Hey everyone,
>>
>> Firstly, I apologize I sent the previous email under an incorrect subject line.
>>
> 
> Yes, but you still hijacked another thread.
> 
> => In-Reply-To: <ME...@indigorobot.com>
> 
> Please don't do that.  Start a new thread by sending a new message to
> the list.  Don't just repky some random message and change the subject
> line.

At least give him credit for showing plenty of diagnostic information. 
That's something we rarely see with newbies. :)

Colin

Re: Custom Object-Oriented Module using HTML::Template

Posted by "Roberto C. Sánchez" <ro...@connexer.com>.

On Wed, Mar 12, 2008 at 11:02:27PM +0000, xyon wrote:
> Hey everyone,
> 
> Firstly, I apologize I sent the previous email under an incorrect subject line.
> 

Yes, but you still hijacked another thread.

=> In-Reply-To: <ME...@indigorobot.com>

Please don't do that.  Start a new thread by sending a new message to
the list.  Don't just repky some random message and change the subject
line.

Regards,

-Roberto

-- 
Roberto C. Sánchez
http://people.connexer.com/~roberto
http://www.connexer.com

Re: Custom Object-Oriented Module using HTML::Template

Posted by xyon <xy...@indigorobot.com>.

Fixed. I forgot to print the template->output.

print $template->output;

On Wed, 2008-03-12 at 23:02 +0000, xyon wrote:
> Hey everyone,
> 
> Firstly, I apologize I sent the previous email under an incorrect subject line.
> 
> I am working on my first Object-Oriented project, and have hit a slight
> snag. I am using HTML::Template to output within the View module, but it
> never outputs. I don't see any errors in the logs, I just get a blank
> page. Below is pertinent information including a test script with its
> output:
> 
> 
> 
> OS Info:
> ----------------------------------------------------
> CentOS release 4.6 (Final)
> ----------------------------------------------------
> 
> 
> 
> Package info:
> ----------------------------------------------------
> perl-5.8.8-11
> perl-HTML-Template-2.9-1
> httpd-2.0.59-1.el4s1.10.el4.centos
> mod_perl-2.0.3-1.el4s1.3
> ----------------------------------------------------
> 
> 
> 
> /home/perl/Myserver/View.pm
> ----------------------------------------------------
> package Myserver::View;
> 
> #Setup some essentials
> use strict;         #strict tolerance for code
> use Carp;           #debugging
> use diagnostics;    #more debugging
> use warnings;       #more debugging
> 
> #Loadup some needed functions
> use HTML::Template;
> 
> sub new {
>     my $self        = shift;
>     return $self;
> }
> 
> sub mainpage {
>     my $self        = shift;
>     my $template    = HTML::Template->new( filename =>
> '/home/Perl/tmpl/mainpage.tmpl',
>             cache => 1,
>             debug => 1, 
>             stack_debug => 1 );
>     print "Content-Type: text/html\n\n";
>     $template->output;
>     return $self;
> }
> 
> 1;
> ----------------------------------------------------
> 
> 
> 
> /home/Perl/tests/View_mainpage.pl
> ----------------------------------------------------
> #!/usr/bin/perl -w
> 
> # Test printing of the main page
> print "Main Page..";
> 
> #Let's load the view module
> use lib "../";
> use Myserver::View;
> #Now let's load some things that are very handy
> use strict;         #strict tolerance for code
> use Carp;           #debugging
> use warnings;       #more debugging
> use diagnostics;    #even more debugging
> 
> # Let's create an object
> my $view        = Myserver::View->new;
> 
> # Now, let's tell View to display the main page
> $view->mainpage;
> 
> print ".OK";
> 
> 1;
> ----------------------------------------------------
> 
> 
> 
> /home/Perl/tmpl/mainpage.tmpl:
> ----------------------------------------------------
> <html><body bgcolor="#FF00FF">Test!</body></html>
> ----------------------------------------------------
> 
> 
> 
> Output with debugging on (as above):
> ----------------------------------------------------
> $ tests/View_mainpage.pl 
> ### HTML::Template Debug ### In _parse:
> ### HTML::Template _param Stack Dump ###
> 
> $VAR1 = [
>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> '
>         ];
> 
> Main Page..Content-Type: text/html
> 
> ### HTML::Template Debug ### In output
> ### HTML::Template output Stack Dump ###
> 
> $VAR1 = [
>           \'<html><body bgcolor="#FF00FF">Test!</body></html>
> '
>         ];
> 
> .OK
> ----------------------------------------------------
> 
> 
> 
> Output without debugging:
> ----------------------------------------------------
> $ tests/View_mainpage.pl 
> Main Page..Content-Type: text/html
> 
> .OK
> ----------------------------------------------------
> 
> 
>