access to Rainbows! config from within the application

access to Rainbows! config from within the application

[russell muetzelfeldt]

Hi All,

Is there any way to read the server configuration from within the application that's being hosted?

I'm about to add a Rainbows!-hosted file upload component to an existing application. At the moment I've got duplication between the app ("Note: maximum attachment size is 200MB") and rainbows.rb ("client_max_body_size 200*1024*1024") and am wondering if there's any way for the app to know what client_max_body_size the server is configured for so I can display a human-friendly version of that on the attachment page.

(please cc: replies as I'm not subscribed to the list)


cheers

Russell

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Re: access to Rainbows! config from within the application

[Eric Wong]

russell muetzelfeldt <russm-wWwMKTv0ClVAfugRpC6u6w@public.gmane.org> wrote:
> Hi All,
> 
> Is there any way to read the server configuration from within the
> application that's being hosted?

Hi russell,

There's no stable/official internal API, and there probably won't be.
We try not to encourage propagating new, ad-hoc standards that other
Rack servers do not support.  Sometimes it's not easy to avoid (e.g.
async.callback + EventMachine stuff), but we try.

However, since the config file is Ruby, you can always use a global
variable in your config file.

> I'm about to add a Rainbows!-hosted file upload component to an
> existing application. At the moment I've got duplication between the
> app ("Note: maximum attachment size is 200MB") and rainbows.rb
> ("client_max_body_size 200*1024*1024") and am wondering if there's any
> way for the app to know what client_max_body_size the server is
> configured for so I can display a human-friendly version of that on
> the attachment page.

So something like this:

  Rainbows! do
    client_max_body_size($client_max_body_size = 200*1024*1024)
  end

If you have more variables you want to set, I know some folks
that use a global hash object or Struct, too.

> (please cc: replies as I'm not subscribed to the list)

-- 
Eric Wong
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Re: access to Rainbows! config from within the application

[russell muetzelfeldt]

On 03/09/2010, at 4:28 PM, Eric Wong wrote:
> russell muetzelfeldt <russm-wWwMKTv0ClVAfugRpC6u6w@public.gmane.org> wrote:
>> 
>> Is there any way to read the server configuration from within the
>> application that's being hosted?
> 
> There's no stable/official internal API, and there probably won't be.
> We try not to encourage propagating new, ad-hoc standards that other
> Rack servers do not support.

absolutely fair enough...


> So something like this:
> 
>  Rainbows! do
>    client_max_body_size($client_max_body_size = 200*1024*1024)
>  end
> 
> If you have more variables you want to set, I know some folks
> that use a global hash object or Struct, too.

ah, OK. I wasn't sure what context the Rainbows! config was evaluated in and tried

MAX_UPLOAD = 200*1024*1024
Rainbows! do
  client_max_body_size MAX_UPLOAD
end

and then referencing MAX_UPLOAD in my config.ru where app-wide stuff gets stuffed into Rack::Config but couldn't resolve that constant - rather than wading into looking at the scopes used for config evaluation I thought I'd just ask...

rather than using global vars I've packed some constants into a Config module in my app and it's all good.

thanks for the pointer!

cheers

Russell


>> (please cc: replies as I'm not subscribed to the list)

(now subscribed)

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