/ 
lsn-data-hub-05.00289
River stage zero No dependents
/ Data::Hub::FileSystem::PerlModule

NAME

Data::Hub::FileSystem::PerlModule -

SYNOPSIS

EXPORTS

Nothing exported by default

DEPENDENCIES

This module requires these other modules and libraries:

Error::Logical
Error::Programatic
Perl::Module
Data::Hub::Util

DESCRIPTION

PerlModule now inserts an @INC hook which looks for your file in Hub context. Meaning, you may now:

require '/web/scripts/util.pm';
require '../shared.pm';
require './share.pm';

from within your module. Note that this hook is inserted at beginning of @INC and will be run first. Modules which exist in the same directory as the calling module must be prefixed with './', as in:

require './share.pm'; # correct
require 'share.pm';   # not found

When calling routines, if the module has defined an ACCESS function, it will be called (once per checkpoint) before calling a routine.

sub ACCESS {
  return 1;   # return true (access allowed) or false (access denied)
}

PACKAGE INTERNALS

__content

Get/Set file contents

FETCH

Get subroutine

Note, do not eval, i.e., require, the contents until a sub is invoked. This is a security consideration, as eval is obviously dangerous. The intention is that one can access the contents of the file using this FileSystem object, without its contents being eval'd.

The downside is that we will return a valide CODE reference no matter what key is being fetched. This could be handled with some /^sub\s+(\w+)/ type magic in __parse_content.

STORE

Store subroutine value, fatal error!

__use_content

Eval file contents (use as a module)

The package name is determined from its absolute path

__require_hook

Evaluate paths in current Hub scope

Apache2::Reload considers every value in %INC to be a file path. By default the hook is placed in %INC in place of the file name (see %INC in perlvar). Apache2::Reload will issue a warning when trying to reload the array, so we set the %INC entry ourselves.

__scan

Read from disk if necessary

__parse_content

Generate dynamic package name

The perl-module should begin with (on its own line!):

# PerlModule

which will be replaced with:

package _home_user_test_module_pm;

presuming the file is located at /home/user/test/module.pm

Note:

.-------------------  No whitespace is allowed before the pound-sign (#)
v
# PerlModule
 ^
 '------------------  Whitespace between the pound-sign and first word is 
                      optional.

If the content defines a package, e.g., package Local; no modification is performed.

If the content does not include the # PerlModule crown, it will be inserted.

DEPRICATED

If the first line is:

package PACKAGE;

it will be replaced with the dynamic package name.

__sig_warn

Replace '(eval ##)' with file name

__sig_die

Replace '(eval ##)' with file name

__unload

Unload a previously loaded package from this file path

Taken from ModPerl::Util::unload_package_pp

AUTHORS

Ryan Gies <ryangies@cpan.org>

COPYRIGHT

Copyright (C) 2014-2016 by Ryan Gies. All rights reserved.
Copyright (C) 2006-2013 by Livesite Networks, LLC. All rights reserved.
Copyright (C) 2000-2005 by Ryan Gies. All rights reserved.
Redistribution and use in source and binary forms, with or without 
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, 
this list of conditions and the following disclaimer.
* The origin of this software must not be misrepresented; you must not 
claim that you wrote the original software. If you use this software in a 
product, an acknowledgment in the product documentation would be 
appreciated but is not required.
* Altered source versions must be plainly marked as such, and must not be 
misrepresented as being the original software.
* The name of the author may not be used to endorse or promote products 
derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED 
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 
EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
OF SUCH DAMAGE.
To the best of our knowledge, no patented algorithms have been used. However, we
do not have the resources to carry out a patent search, and therefore cannot 
give any guarantee of the above statement.