Re: [Cppcms-users] Mounting both synchronous and asynchronous applications

[Artyom <art...@ya...>]

> 
> Back  to my point... I am able to proceed my work now. However, there is  
> still one thing I don't understand:
> 
>      {
>          dispatcher().assign("^ps$",&async_app::catch_all,this);
>      }
>      
>s.applications_pool().mount(cppcms::applications_factory<sync_app>(),cppcms::mount_point("/s/(.*)",1));
>
>      s.applications_pool().mount(e,cppcms::mount_point("/as/(.*)",1));

Lets start:

Quoting Documentation:

> cppcms::mount_point::mount_point(std::string const & path,int group) 
>
> Create a mount point that checks PATH_INFO only and passes matched group for 
>dispatching 
>

That means that PATH_INFO is matched so 

   PATH_INFO = /as/ps

Matched agains:

   /as/(.*)

And then "ps" is selected and
passed to main of application
that on "^ps$" gets matched.

What does not match the documentation?

> cppcms::mount_point::mount_point(std::string const &script)
>
> Create a mount point that checks SCRIPT_NAME, and passes PATH_INFO for 
>dispatching 
>

Now this is fo case where we have for exaple

   foo.cgi
   bar.cgi

And you want to match them 

So for URL foo.cgi/beep SCRIPT_NAME=foo.cgi PATH_INFO=/beep

foo.cgi would be matched by mount_point("foo.cgi")
and then "/beep" would passed to main of the application for dispatching

...
> cppcms::mount_point::mount_point()
> 
> Create default mount point, it uses PATH_INFO for url-dispatching and gives no 
>restriction on URL 
>

This case - the default mount point when you use just a one application
it passes all PATH_INFO for URL dispatching.

> Please take special note of these two lines in the  log:
> 
> 2011-02-02 02:30:07 GMT; ENV, debug: PATH_INFO:/as/ps  (cgi.cpp:114)
> 2011-02-02 02:30:07 GMT; ENV, debug: SCRIPT_NAME:/cgi  (cgi.cpp:114)
> 
> The description for the overloaded  function
> 
> cppcms::mount_point::mount_point(std::string const &script)      
> 
> is
> 
> "Create a mount point that checks  SCRIPT_NAME, and passes PATH_INFO for  
> dispatching the version of  mount_point() among the overloads"
> 
> Refer  to:
> 
> 
http://cppcms.sourceforge.net/cppcms_ref_v0_99/classcppcms_1_1mount__point.html
> 
> My  understanding is that the following code should match  nothing:
> 
>      s.applications_pool().mount(e,cppcms::mount_point("/as/(.*)",1));
> 

No. It is matched against PATH_INFO that is the usual case

> because  according to the log, the incoming SCRIPT_NAME is "/cgi". However,  
> the  reality is that it matches! On the contrary, this version fails to  
> match:
> 
>      s.applications_pool().mount(e,cppcms::mount_point("/cgi/(.*)",1));
> 
> Is  this a descrepancy between CppCMS documentation and the library  itself?

No, you just should read documentation more carefully.

Different mount points constructors have different semantics allowing
to both use script_name and path_info for dispatching, however
every mount point should extract something to pass to application's main.

Artyom