Nitrogen/Webmachine dispatch and path_info question

[kevin montuori]

All --

I think I'm misunderstanding something about either Nitrogen or Webmachine and I'm hoping someone can clarify.  

I have a nitrogen_webmachine:dispatch/0 that reads:

dispatch() -> 

    [

     {["css", '*'], static_resource, [{root, "./site/static/css"}]},

     {["images", '*'], static_resource, [{root, "./site/static/images"}]},

     {["nitrogen", '*'], static_resource, [{root, "./site/static/nitrogen"}]},

     {['test', '*'], ?MODULE, testpage},

     {['*'], static_resource, [{root, "./site/static"}]}

    ].

I am expecting that with this dispatch table and a request to /test/a/b/c I'd see that wf:path_info/0 would return "a/b/c".  With my setup it's returning 'undefined'.  Note that if I stick to the default dispatch table:

{["css", '*'], static_resource, [{root, "./site/static/css"}]},

{["images", '*'], static_resource, [{root, "./site/static/images"}]},

{["nitrogen", '*'], static_resource, [{root, "./site/static/nitrogen"}]} 

{['*'], ?MODULE, dynamic_route_handler}

I see the path_info data being set as I'd expect.  Any pointers to where I'm going wrong?

Thanks!

k. 

[Jesse Gumm]

I'll admit I've never played with the dispatch part of the webmachine
aspect of nitrogen, but in the code I have, dispatch()/0 is in
nitrogen_sup.erl and not nitrogen_webmachine.erl.

I suspect what it's doing is rewriting the url to just /testpage and
not passing the PathInfo which is parsed out in the
dynamic_route_handler, though I'll admit I'm not positive without
digging in further.

Personally, I think you'd be better off making a custom dynamic_route_handler.

1) Copy https://github.com/nitrogen/nitrogen_core/blob/master/src/handlers/route/dynamic_route_handler.erl
into your src directory somewhere, renaming it to something else (ie:
my_dyn_route_handler.erl), remember to change the -module() header as
well,

2) Modify that new route handler to include a new section:

route([$t,$e,$s,$t,$/ | PathInfo]) ->
{testpage,PathInfo}.

3) Modify nitrogen_sup.erl and nitrogen_webmachine.erl, changing all
references to 'dynamic_route_handler' to 'my_dyn_route_handler'

This would make it more easily portable to other webservers (should
you decide to switch to mochiweb or whatever).

-Jesse

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--
Jesse Gumm
Sigma Star Systems
414.940.4866
gu...@sigma-star.com
http://www.sigma-star.com