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December 5, 2015 23:21
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Example how handle long blocking operation when server asynchronous
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| #!/usr/bin/perl | |
| use strict; | |
| use warnings; | |
| use v5.10; | |
| use Mojolicious::Lite; | |
| use Mojo::IOLoop; | |
| use Mojo::IOLoop::ReadWriteFork; | |
| plugin 'Mojolicious::Plugin::ForkCall'; | |
| get '/' => sub { | |
| my $c = shift; | |
| $c->render(template => 'index'); | |
| }; | |
| websocket '/ws' => sub { | |
| my $c = shift; | |
| $c->inactivity_timeout(60 * 10); | |
| $c->on(message => sub { | |
| my ($c, $msg) = @_; | |
| if ($msg eq 'long_operation_1') { | |
| $c->fork_call( | |
| sub { | |
| my @args = @_; | |
| sleep 3; | |
| return join ', ', @args; | |
| }, | |
| ['argument_1', 'argument_2' , 'argument_n'], | |
| sub { | |
| my ($c, @return) = @_; | |
| $c->send($return[0]); | |
| } | |
| ); | |
| } | |
| if ($msg eq 'long_operation_2') { | |
| $c->stash(fork => my $fork = Mojo::IOLoop::ReadWriteFork->new); | |
| my $cat_result = ''; | |
| $fork->on(error => sub { | |
| my($fork, $error) = @_; | |
| warn $error; | |
| }); | |
| $fork->on(close => sub { | |
| my($fork, $exit_value, $signal) = @_; | |
| $c->send($cat_result); | |
| delete $c->stash->{fork}; | |
| }); | |
| $fork->on(read => sub { | |
| my ($fork, $buffer) = @_; # $buffer = both STDERR and STDOUT | |
| $cat_result .= $buffer; | |
| }); | |
| $fork->start( | |
| program => 'ls', | |
| program_args => ['-la'], | |
| ); | |
| } | |
| }); | |
| $c->on(finish => sub { | |
| my ($c, $code, $reason) = @_; | |
| }); | |
| } => 'ws'; | |
| app->start; | |
| __DATA__ | |
| @@ index.html.ep | |
| <head> | |
| <script src="http://code.jquery.com/jquery-2.1.3.min.js"></script> | |
| </head> | |
| <body> | |
| <script> | |
| $(document).ready(function () { | |
| function websocket () { | |
| var ws = new WebSocket('<%= url_for('ws')->to_abs %>'); | |
| ws.onmessage = function(event) { | |
| document.body.innerHTML += event.data + '<br/>'; | |
| }; | |
| ws.onopen = function() { | |
| ws.send('long_operation_2'); | |
| } | |
| } | |
| websocket(); | |
| }); | |
| </script> | |
| </body> |
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