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List:       apache-modperl
Subject:    Custom Configuration Best Practice
From:       "David E. Wheeler" <david () justatheory ! com>
Date:       2015-03-02 1:05:22
Message-ID: 6BB89131-CFEA-4D8F-BD68-5225A3B398EA () justatheory ! com
[Download RAW message or body]

Fellow mod_perlers,

I followed the instructions in the Server Configuration Customization guide to create \
a custom Apache configuration directive like so:

   my $foo;
   sub foo { $foo = $_[2] }
   Apache2::Module::add(__PACKAGE__, [
       { name => 'MyFoo', func => __PACKAGE__ . '::foo' },
   ]);

   sub handler {
       my $r = shift;
       $r->print($foo);
       return OK;
   }

This works pretty well; I can now set the MyFoo directive in my httpd.conf. But it \
feels a little hinky to set up package globals that get set on every request like \
this. It feels like it would make more sense if they were getting passed to an object \
method, but foo() is called as a function here; the first parameter is the class \
name, not an object. Also, I tried to use an anonymous sub in the add call:

   my $foo;
   Apache2::Module::add(__PACKAGE__, [
       { name => 'MyFoo', func => sub { $foo = $_[2] },
   ]);

But that didn't work either; mod_perl complained that it couldn't find a function \
named "CODE(0x1d5e988P)" in the package. I was surprised by this since the docs say:


> The func attribute expects a reference to a function or a function name. 


https://perl.apache.org/docs/2.0/user/config/custom.html#C_func_

So none of this feels quite right to me. Anyone got a point to best practices for \
setting up custom configuration directives? Or is this close to what everyone does \
anyway?

Thanks,

David


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