Linux programming environment described in Mod_perl

2011-06-04  来源:本站原创  分类:OS  人气:82 

You are viewing Linux | Unix is ​​Linux programming environment described in the Mod_perl
1 Introductory Guide
mod_perl is a huge and complex tool, it built a number of modules to help you easily build dynamic Web site. The purpose of this guide is to help you build a good mod_perl module, and from understanding mod_perl implementation technology. I do not recommend using the techniques described here to build a large site, especially for a people who had just set foot in mod_perl. But I recommend you look at it in depth some of the built-in programs, such as Mason, AxKit, EmbPerl, Apache:: ASP and PageKit and so on.

1.1 What do you need?
This guide assumes that you have had experience in installing and testing mod_perl. And a newer version of the Apache installation experience. Because you may need on your machine when the appropriate changes to achieve the configuration in this article. We need to install some modules and you need to enter the Apache configuration directory for changes. So the best you have root privileges to do these things. Of course, you also need a text editor.

1.2. To the point
mod_perl module is a Perl module, but it has a more special design. The most convenient way to create a Perl module that uses the standard Perl distribution comes with a tool h2xs. You can type in command line mode to see h2xs its parameter list. Now, to an appropriate directory to start a new project, type:

h2xs-A-X-n Apache:: Tutorial:: First

h2xs will create the directory Apache, and other subdirectories. now look at the directory into the deepest level:

cd Apache / Tutorial / First

In this new directory, you can see five files: Changes, First.pm, MANIFEST, Makefile.PL and test.pl. Their role is as follows:

Changes

This file changes as your project log (changelog) file

First.pm

This is the main module file that contains your mod_perl handler code (handler code).

MANIFEST

This file is used to automatically build a tar.gz version of the module type distribution. So you can get your CPAN module released or distributed to others. It contains all your files in the project list.

Makefile.PL

This is the standard Perl Makefile constructor. Used to create the Makefile.PL file to compile the module.

test.pl

Some of the modules for the test script. By default it will just check the module compiled and loaded

Well, now we can begin to work First.pm into the mod_perl module. Use a text editor to open the file, modified as follows:

package Apache:: Tutorial:: First;

use strict;

use vars qw / $ VERSION /;

use Apache:: Constants;

$ VERSION = 0.01;

sub handler {

my $ r = shift;

$ R-> send_http_header ('text / html');

print "<html> <body> Hello World </ body> </ html>";

return OK;

}

1;

Do not forget the end of the file "1;" For Perl, a module to return the last non-zero value indicates that the module has been successfully compiled.

1.3 Installing the modules you
h2xs tools to make installation of our module is very convenient. And your First.pm files in the same directory. , And type:

perl Makefile.PL

make

make test

If the make test is successful, you need to run as root:

make install

So you put your module into the perl library directory (library directory).

1.4 Add the module for Apache, a handle (handler) Now we need to modify the configuration directory into the Apache configuration file, so that we as an Apache module content processing stage of the processor. Open the httpd.conf file, add the following configuration at the end:

<Location /mod_perl_tutorial>

SetHandler perl-script

PerlHandler Apache:: Tutorial:: First

</ Location>

Then save the configuration file, and restart apache server:

apachectl stop

apachectl start

Now use the browser to access http://localhost/mod_perl_tutorial, you will see the show as scheduled "Hello World" page.

2. What happened here? Well, here is what happened then?

When Apache starts, it reads its configuration instructions and the appropriate command to the appropriate processing of the command module. There are two related directives SetHandler and PerlHandler.

The first directive SetHandler handled by the mod_mime module, what the instructions said to use the module as a major part of processing the request. This set of perl-script that use mod_perl to handle the request.

The second command PerlHandler by the mod_perl module to handle, it's just simple instructions to use our module to handle the major part of the request. It is important to note that whenever you have a PerlHandler, you need the appropriate configuration directives SetHandler perl-script. In order to make your mod_perl code work. I always think this is a weakness, but this will involve Apache internal processing mechanism, so it is difficult to change in the future.

Now request a, Apache see what modules to handle the URI, and here decided to use mod_perl, and mod_perl knows it must send the request to our module, and calls our module's handler () function as Apache:: Request object The first argument. Our handler () return value determines the next Apache will do. OK now we know that the return value means that every success. OK is from Apache:: Constants module exports constants.

3 debugging <br /> If you do not see "Hello World", you may see an error page, or something completely different. The first step in the end to see the error log to see what error occurred. I used to request in the browser immediately after the error log. You can use the tail tools:

tail-f / path / to / apache / logs / error_log

(Use your real error_log path to replace the above path, if you're not sure where it is, check your httpd.conf file ErrorLog directive part)

Now reload the page, then error_log will tell you where there is a problem. More about perl debugging, see perldebug.

4. <br /> Add more for now if you want to make some changes to the above situation, how? Unfortunately, the only installation mode as follows:

Modify your First.pm file

Re-run make install as root

Restart Apache

This may be very troublesome, especially to restart Apache. To address this problem, we can also install a specially designed module to avoid having trouble doing so. First you need to download it from CPAN and install Apache:: Reload module (unless you've been using mod_perl 1.26 or later). Here http://search.cpan.org/search?dist=Apache-Reload download.

Tar.gz file and unlock new directory, run:

perl Makefile.PL

make

Then to run as root:

make install

Now re-open the httpd.conf file, add:

PerlInitHandler Apache:: Reload

This change will test all the modules and reloaded automatically when needed a new module. This is useful for the development, but there will be a performance penalty, so the development is complete, turn off the feature.

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