MapToStorageHandler and custom config

[John ORourke <jo...@o-rourke.org>]

Hi folks,

I've implemented some custom config directives, works fine.

However, when my MapToStorage handler asks for the per_dir_config hash, 
it seems to be getting the server config - all other handlers get the 
per-dir no problem.

Any ideas?

cheers
John

Re: MapToStorageHandler and custom config

[John ORourke <jo...@o-rourke.org>]

Thanks for the answers folks... I must've been having a blonde moment, 
I'm sure I knew that somewhere.

Skipping the directory walk is one of the reasons I'm using a 
MapToStorage handler - no need for all that disk access - but I'm also 
using it to map /content/some/path onto /content/<hostname>/some/path, 
so I wanted to enable/disable it in <Location>.

I can tell my custom config to write config values into the server config.

cheers
John

Geoffrey Young wrote:

>William A. Rowe, Jr. wrote:
>  
>
>>Fred Moyer wrote:
>>
>>    
>>
>>>On Fri, 27 Oct 2006, John ORourke wrote:
>>>
>>>
>>>      
>>>
>>>>Hi folks,
>>>>
>>>>I've implemented some custom config directives, works fine.
>>>>
>>>>However, when my MapToStorage handler asks for the per_dir_config
>>>>hash, it seems to be getting the server config - all other handlers
>>>>get the per-dir no problem.
>>>>        
>>>>
>>>My guess is that you cannot access MapToStorage because at this phase
>>>the request has not yet been associated with a particular filename or
>>>directory [1].
>>>      
>>>
>
>yes.  in fact, you can't even place the PerlMapToStorageHandler in a
><Location> block, so by definition you won't (yet) have a meaningful
>per-directory config.
>
>I wrote as much hours ago, but my response seems to have vanished into
>the aether.  maybe it's been so long since I posted here the list daemon
>is trying to teach me a lesson :)
>
>  
>
>>>[1]
>>>http://perl.apache.org/docs/2.0/user/handlers/http.html#PerlMapToStorageHandler
>>>      
>>>
>>Note that MapStorageToHandler does this association, so hook ordering plays
>>a huge role.  It's critical that if you plan to morph the entity you do so
>>BEFORE the core directory_walk occurs, if you are inspecting it that should
>>happen AFTER to core directory_walk.
>>    
>>
>
>pretty much the only honest reason I can think of for writing a
>PerlMapToStorageHandler is for removing directory_walk on servers
>generating 100% dynamic content.  of course, we often do very dishonest
>things over here in mod_perl land ;)
>
>--Geoff
>
>  
>

Re: MapToStorageHandler and custom config

[Geoffrey Young <ge...@modperlcookbook.org>]

William A. Rowe, Jr. wrote:
> Fred Moyer wrote:
> 
>>On Fri, 27 Oct 2006, John ORourke wrote:
>>
>>
>>>Hi folks,
>>>
>>>I've implemented some custom config directives, works fine.
>>>
>>>However, when my MapToStorage handler asks for the per_dir_config
>>>hash, it seems to be getting the server config - all other handlers
>>>get the per-dir no problem.
>>
>>My guess is that you cannot access MapToStorage because at this phase
>>the request has not yet been associated with a particular filename or
>>directory [1].

yes.  in fact, you can't even place the PerlMapToStorageHandler in a
<Location> block, so by definition you won't (yet) have a meaningful
per-directory config.

I wrote as much hours ago, but my response seems to have vanished into
the aether.  maybe it's been so long since I posted here the list daemon
is trying to teach me a lesson :)

>>
>>[1]
>>http://perl.apache.org/docs/2.0/user/handlers/http.html#PerlMapToStorageHandler
> 
> 
> Note that MapStorageToHandler does this association, so hook ordering plays
> a huge role.  It's critical that if you plan to morph the entity you do so
> BEFORE the core directory_walk occurs, if you are inspecting it that should
> happen AFTER to core directory_walk.

pretty much the only honest reason I can think of for writing a
PerlMapToStorageHandler is for removing directory_walk on servers
generating 100% dynamic content.  of course, we often do very dishonest
things over here in mod_perl land ;)

--Geoff

Re: MapToStorageHandler and custom config

["William A. Rowe, Jr." <wr...@rowe-clan.net>]

Fred Moyer wrote:
> On Fri, 27 Oct 2006, John ORourke wrote:
> 
>> Hi folks,
>>
>> I've implemented some custom config directives, works fine.
>>
>> However, when my MapToStorage handler asks for the per_dir_config
>> hash, it seems to be getting the server config - all other handlers
>> get the per-dir no problem.
> 
> My guess is that you cannot access MapToStorage because at this phase
> the request has not yet been associated with a particular filename or
> directory [1].
> 
> [1]
> http://perl.apache.org/docs/2.0/user/handlers/http.html#PerlMapToStorageHandler

Note that MapStorageToHandler does this association, so hook ordering plays
a huge role.  It's critical that if you plan to morph the entity you do so
BEFORE the core directory_walk occurs, if you are inspecting it that should
happen AFTER to core directory_walk.

It's pretty simple; you shouldn't be modifying resources after they are vetted
by directory_walk.

That's why translations occur in the TranslateName hook.  MapToStorage really
should only be used to identify the URL to a resource, and if you are overriding
the default, then a resource not in the filesystem.

	

Re: MapToStorageHandler and custom config

[Fred Moyer <fr...@redhotpenguin.com>]

On Fri, 27 Oct 2006, John ORourke wrote:

> Hi folks,
>
> I've implemented some custom config directives, works fine.
>
> However, when my MapToStorage handler asks for the per_dir_config hash, it 
> seems to be getting the server config - all other handlers get the per-dir no 
> problem.

My guess is that you cannot access MapToStorage because at this phase the 
request has not yet been associated with a particular filename or 
directory [1].

[1]
http://perl.apache.org/docs/2.0/user/handlers/http.html#PerlMapToStorageHandler