Startup/Shutdown hook for worker processes

[Frank Brendel]

Hi,

my application needs to load Selenium::Chrome for every single worker process.

I made this via

Mojo::IOLoop->next_tick(sub {

      $Self->{Chrome} = Selenium::Chrome->new(

         extra_capabilities => {

            chromeOptions => {

               args => [

                  'headless', 'no-sandbox', 'window-size=1400,900',

                  'disk-cache-size=0', 'disable-gpu', 'v8-cache-options=off'

               ]

            }

         },

      );

But I have no idea where to shutdown the chrome binary.

I've tried it via the 

Mojo::IOLoop->on(finish

event but that stops the chromedriver to early so that outstanding Selenium requests fail.

Thanks

Frank

[Dan Book]

You could try shutting it down in an END {} block. To do this you would need to store the instance to shut down by process ID so you know which one to shut down.

-Dan

--
You received this message because you are subscribed to the Google Groups "Mojolicious" group.
To unsubscribe from this group and stop receiving emails from it, send an email to mojolicious...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/mojolicious/58314c80-14ee-4cbe-8e2f-c7a5bebc7c0a%40googlegroups.com.

[Frank Brendel]

Hi Dan,

thanks for the reply.

Unfortunately, the END block doesn't work.

But I've solved the problem as follows.

The application creates the Selenium::Chrome object via 'has' as described in the wiki.

has Chrome => sub {
   my $Self = shift;
   my $Chrome = Selenium::Chrome->new(

      extra_capabilities => {
         chromeOptions => {
            args => [
               'headless', 'no-sandbox', 'window-size=1400,900',
               'disk-cache-size=0', 'disable-gpu', 'v8-cache-options=off'
            ]
         }
      },

      error_handler => sub { $Self->Log("W", $_[1]); }
   );
   return $Chrome;
};

When the server shuts down it sets a flag and stops the Chrome webdriver.

$Self->hook(before_server_start => sub {
      my ($Server, $App) = @_;
      $Self->{Shutdown} = 0;
      $Server->ioloop->on(finish => sub {
         $Self->Log("I", "Shutdown Chrome");
         $Self->{Shutdown} = 1;
         $Self->Chrome->shutdown_binary;
      });
   });

and the controller returns immediately if $App->{Shutdown} is 1.

Nevertheless, this leads to minor synchronization problems when the server stops Chrome while the application controller is processing a request, but I can handle it.

Thanks,

Frank

Am Freitag, 27. März 2020 16:41:32 UTC+1 schrieb Dan Book:

You could try shutting it down in an END {} block. To do this you would need to store the instance to shut down by process ID so you know which one to shut down.

-Dan

On Fri, Mar 27, 2020 at 8:31 AM 'Frank Brendel' via Mojolicious <mojol...@googlegroups.com> wrote:

Hi,

my application needs to load Selenium::Chrome for every single worker process.

I made this via

Mojo::IOLoop->next_tick(sub {

      $Self->{Chrome} = Selenium::Chrome->new(

         extra_capabilities => {

            chromeOptions => {

               args => [

                  'headless', 'no-sandbox', 'window-size=1400,900',

                  'disk-cache-size=0', 'disable-gpu', 'v8-cache-options=off'

               ]

            }

         },

      );

But I have no idea where to shutdown the chrome binary.

I've tried it via the 

Mojo::IOLoop->on(finish

event but that stops the chromedriver to early so that outstanding Selenium requests fail.

Thanks

Frank

--
You received this message because you are subscribed to the Google Groups "Mojolicious" group.

To unsubscribe from this group and stop receiving emails from it, send an email to mojol...@googlegroups.com.