mojo async/await with controller

[Tobias Oetiker]

I just read Joel's blog (https://mojolicious.io/blog/2018/12/24/async-await-the-mojo-way/) about async/await support. This is wonderful. I am totally excited about this. Thank you to all involved!

Obviously I had to test this right away and it works great with the Mojolicious::Lite demo shown in the blog. 

But how do I specify a route to a async method in a controller for a Mojolicious app?

Using a callback I can easily translate the Lite approach

$r->get('/cb' => async sub ($c) {
    await Mojo::Promise->new(sub ($resolve,$fail) {
      Mojo::IOLoop->timer(3 => sub {
          $resolve->();
      });
    });
    $c->render(text => 'hello');
});

but how do I use this when I want to have the code in a controller:

$r->get('/ctr')->to('example#hello');

with

package MyApp::Controller::Example;
use Mojo::Base 'Mojolicious::Controller', -async, -signatures;

async sub welcome ($self) {
  await Mojo::Promise->new(sub ($resolve,$fail) {
      Mojo::IOLoop->timer(3 => sub {
          $resolve->();
      });
  });
  $self->render(text => 'hello');
}

does not work as expected as the router does not seem to expect the methods to be async when called like that.

[Tobias Oetiker]

ps. it also does not work when the method in the controller is called hello ...

[Felipe Gasper]

I’m just encountering Mojo::AsyncAwait and notice that it lists Coro as a dependency.

Isn’t Coro problematic in newer Perls? I thought Marc had basically written off support for 5.22 onward.

-F

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[Tobias Oetiker]

it does not depend on coro anymore ... read the blog post I cited!

[Tobias Oetiker]

aargh I cited the wrong one :) way to excited just now :)

https://mojolicious.io/blog/2019/12/26/announcing-core-async-await/

[Tobias Oetiker]

I am answering my own questions here ... so it seems I still have to call render_later in the controller to make this work ..

async sub hello ($self) {
  # Render template "example/welcome.html.ep" with message
  $self->render_later;

[Jeyaraj Durairaj]

Hi Tobias,

I am still getting the following.

Note: my router is   $r->post('/login')->to('sessions#on_user_login_p')->name('do_login');

[2020-05-26 23:47:28.06952] [-19048] [debug] Routing to controller "ConvergeAtCommex::Controller::Sessions" and action "on_user_login_p"

[2020-05-26 23:47:28.06985] [-19048] [debug] Action not found in controller

[Sebastian Riedel]

I am still getting the following.

Note: my router is   $r->post('/login')->to('sessions#on_user_login_p')->name('do_login');

[2020-05-26 23:47:28.06952] [-19048] [debug] Routing to controller "ConvergeAtCommex::Controller::Sessions" and action "on_user_login_p"

[2020-05-26 23:47:28.06985] [-19048] [debug] Action not found in controller

That information seems completely unrelated to the original question in this thread. Please refrain from necroing.

--

sebastian 

[Jeyaraj Durairaj]

Sure sir.