How to create a common handler for all incoming URLs?

Question

I am in the process of writing some web api that returns data in JSON format.

For all incoming URLs, I need to return some result from the cache if the cache period does not expire.

This logic is universal for all URLs.

Question:

How to implement some common logic for all incoming urls in Mojolicious :: Lite?

I tried to do

any '/:bar' => [bar => qr/.+/] => sub { # ... # Return JSON object immediately from cache if it is applicable # ... } 

But this leads to a very long page load and

 Template "bar.html.ep" not found 

in the morbo log (but the "/ target" handler will finally be executed after a very long delay).

I work great at Mojo, so any help would be appreciated

Thanks!

Answer 1

Yes, the before_dispatch hook seems to be correct, and it works with Mojolicious::Lite . Here is a proof of concept that will give a new result for each unique query, but returns repeat results for repeated queries. In this program, a regular request handler fills the cache, but if you want to separate this part from the main functions of your code, you can do caching in after_dispatch .

 use Mojolicious::Lite; our %CACHE; any '/:any' => sub { my $self = shift; my $param = $self->param('any'); my $result = { reqtime => time, param => $param, number => rand }; my $path = $self->req->url->path->to_string; $CACHE{$path} //= $result; $self->render( json => $result ); }; app->hook( before_dispatch => sub { my $c = shift; my $path = $c->req->url->path->to_string; if (defined($CACHE{$path})) { $c->render( json => $CACHE{$path}, status => 200 ); } } ); app->secrets([42])->start; 

Run Example:

 $ morbo cachedemo.pl >/dev/null 2>&1 & $ for req in foo foo1 foo2 foo3 foo foo1 > do curl http://localhost:3000/$req ; echo ; sleep 1 ; done {"number":0.848003210075227,"reqtime":1444254617,"param":"foo"} {"number":0.0745738560703799,"reqtime":1444254618,"param":"foo1"} {"number":0.484934245556467,"reqtime":1444254619,"param":"foo2"} {"number":0.181112856445004,"reqtime":1444254620,"param":"foo3"} {"number":0.848003210075227,"reqtime":1444254617,"param":"foo"} <-- dup {"number":0.0745738560703799,"reqtime":1444254618,"param":"foo1"} <-- dup 

Answer 2

you can use * placeholder. Look here

Also add the application to the mode developer:

 Mojolicious->new( mode => 'developer' ); $app->mode( 'developer'); 

You will get quite 404,500 pages that will help you a lot.