[sheepdog] add http transport stub

[MORITA Kazutaka]

At Tue,  2 Jul 2013 00:35:26 +0800,
Liu Yuan wrote:
> 
> This patch set adds transport stub, on top of which we can build Swift or Amazon
> S3 service.
> 
> Only HTTP GET/PUT/POST/HEAD/DELETE (RESTful API) is allowd to interface with
> sheepdog storage.
> 
> The transport is implemented via fastcgi in the address space of sheepdog to
> favor performance. It is currently disabled at compile time.
> 
> How To Test:
> 
> 1 install libfcgi-dev and nginx
> 2 ./configure --enable-http
> 3 run nginx as following:
>   # edit ~/nginx.conf as following:
> =======================================================
> events {
> 	worker_connections 1024;
> }
> 
> http {
> 	server {
> 		listen 80;
> 		server_name localhost;
> 
> 		location / {
> 			fastcgi_pass   localhost:7100;
> 
> 			fastcgi_param   SCRIPT_NAME             $fastcgi_script_name;
> 			fastcgi_param   REQUEST_METHOD          $request_method;
> 			fastcgi_param	CONTENT_LENGTH		$content_length;
> 			fastcgi_param   HTTP_RANGE              $http_range;
> 		}
> 	}
> }
> =======================================================

Just for other users who want to try this feature: If you have the
root priviledge, adding the following to /etc/nginx/conf.d/sheep.conf
and restart the nginx service looks simpler way.

==
server {
	listen 80;
	server_name localhost;

	location / {
		fastcgi_pass   localhost:7100;

		fastcgi_param   SCRIPT_NAME             $fastcgi_script_name;
		fastcgi_param   REQUEST_METHOD          $request_method;
		fastcgi_param	CONTENT_LENGTH		$content_length;
		fastcgi_param   HTTP_RANGE              $http_range;
	}
}
==

Thanks,

Kazutaka