error situation handling when starting app from a script
Hi,
in my bash script I start 3rd party app that runs quickly normally and returns some data that I use later for processing. However if there are problems the app doesn't return anything and just hangs... then my script also hangs of course, awaiting for the app to comeback. Was wondering how to avoid that so the script could carry on or at least bailout with an error if that happens. Is there a way to do it in bash ?
I was thinking maybe I could start/fork seperate process in background which would then check the main process somehow, maybe sending a signal USR1 and then the main process would be maybe writing something to some temp. file and forked process runnig in background would be checking if update to temp. file happend, if not then it could wait some time and kill the main process ?
What do you think?
Any hints on that appreciated,
Cheers,
Tomasz
Moderator's Comments:
Please use code tags next time for your code and data.
Last edited by zaxxon; 09-05-2012 at 10:54 AM..
Reason: code tags
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mojo
Mojo(3pm) User Contributed Perl Documentation Mojo(3pm)NAME
Mojo - Duct tape for the HTML5 web!
SYNOPSIS
use Mojo::Base 'Mojo';
# All the complexities of CGI, PSGI, HTTP and WebSockets get reduced to a
# single method call!
sub handler {
my ($self, $tx) = @_;
# Request
my $method = $tx->req->method;
my $path = $tx->req->url->path;
# Response
$tx->res->code(200);
$tx->res->headers->content_type('text/plain');
$tx->res->body("$method request for $path!");
# Resume transaction
$tx->resume;
}
DESCRIPTION
Mojo provides a flexible runtime environment for Perl real-time web frameworks. It provides all the basic tools and helpers needed to write
simple web applications and higher level web frameworks such as Mojolicious.
See Mojolicious for more!
ATTRIBUTES
Mojo implements the following attributes.
"home"
my $home = $app->home;
$app = $app->home(Mojo::Home->new);
The home directory of your application, defaults to a Mojo::Home object which stringifies to the actual path.
# Generate portable path relative to home directory
my $path = $app->home->rel_file('data/important.txt');
"log"
my $log = $app->log;
$app = $app->log(Mojo::Log->new);
The logging layer of your application, defaults to a Mojo::Log object.
# Log debug message
$app->log->debug('It works!');
"ua"
my $ua = $app->ua;
$app = $app->ua(Mojo::UserAgent->new);
A full featured HTTP 1.1 user agent for use in your applications, defaults to a Mojo::UserAgent object. Note that this user agent should
not be used in plugins, since non-blocking requests that are already in progress will interfere with new blocking ones.
# Perform blocking request
my $body = $app->ua->get('mojolicio.us')->res->body;
METHODS
Mojo inherits all methods from Mojo::Base and implements the following new ones.
"new"
my $app = Mojo->new;
Construct a new Mojo application. Will automatically detect your home directory and set up logging to "log/mojo.log" if there's a "log"
directory.
"build_tx"
my $tx = $app->build_tx;
Transaction builder, defaults to building a Mojo::Transaction::HTTP object.
"config"
my $config = $app->config;
my $foo = $app->config('foo');
$app = $app->config({foo => 'bar'});
$app = $app->config(foo => 'bar');
Application configuration.
# Manipulate configuration
$app->config->{foo} = 'bar';
my $foo = $app->config->{foo};
delete $app->config->{foo};
"handler"
$app->handler($tx);
The handler is the main entry point to your application or framework and will be called for each new transaction, which will usually be a
Mojo::Transaction::HTTP or Mojo::Transaction::WebSocket object. Meant to be overloaded in a subclass.
sub handler {
my ($self, $tx) = @_;
...
}
SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>.
perl v5.14.2 2012-09-05 Mojo(3pm)