Proclet - minimalistic Supervisor

use Proclet;

my $proclet = Proclet->new(
    color => 1
);

# add service
$proclet->service(
    code => sub {
        my $job = $jobqueue->grab;
        work($job);
    },
    worker => 2,
    tag => 'worker'
);

$proclet->service(
    code => sub {
        my $loader = Plack::Loader->load(
            'Starlet',
            port => $port,
            host => $host || 0,
            max_workers => 4,
        );
        $loader->run($app);
    },
    tag => 'web'
);

$proclet->service(
    code => sub {
        exec('/usr/bin/memcached','-p','11211');
    },
);

$proclet->service(
    code => sub {
        scheduled_work();
    },
    tag => 'cron',
    every => '0 12 * * *', #everyday at 12:00am
);


$proclet->run;

Proclet is minimalistic Supervisor, fork and manage many services from one perl script.

Logs from services are Displayed with timestamp and tag.

12:23:16 memcached.1 | <6 server listening (udp)
12:23:16 memcached.1 | <7 send buffer was 9216, now 3728270
12:23:16 memcached.1 | <7 server listening (udp)
12:23:16 web.1       | 2012/08/31-12:23:16 Starman::Server (type Net::Server::PreFork) starting! pid(51516)
12:23:16 web.1       | Resolved [*]:5432 to [0.0.0.0]:5432, IPv4
12:23:16 web.1       | Binding to TCP port 5432 on host 0.0.0.0 with IPv4 
12:23:16 web.1       | Setting gid to "20 20 20 401 204 100 98 81 80 79 61 12 402"

• new

  Create instance of Proclet.

  Attributes are as follows:

  • spawn_interval: Int

    interval in seconds between spawning services unless a service exits abnormally (default: 0)

  • err_respawn_interval: Int

    number of seconds to deter spawning of services after a service exits abnormally (default: 1)

  • color: Bool

    colored log (default: 0)

  • logger: CodeRef

      my $logger = File::RotateLogs->new(...)
      my $proclet = Proclet->new(
          logger => sub { $logger->print(@_) }
      );
    

    Sets a callback to print stdout/stderr. uses warn by default.

  • enable_log_worker: Bool

    enable worker for format logs. (default: 1) If disabled this option, cannot use logger opt too.

  • exec_notice: Bool

    enable start and exec notice message like

      16:38:12 worker.1 | Start callback: worker
    

    (default: 1)

• service

  Add services to Proclet.

  Attributes are as follows:

  • code: CodeRef|ArrayRef|Str

    Code reference or commands of services.

    CodeRef

      $proclet->service(
        code => sub {
            MyWorker->run();
        }
      );
    

    ArrayRef

      $proclet->service(
        code => ['plackup','-a','app.psgi'],
      );
    

    Str

      $proclet->service(
        code => '/usr/bin/memcached'
      );
    

  • worker: Int

    Number of children to fork, default is "1"

  • tag: Str

    Keyword for log. optional

  • every: Str

    Crontab like format. optional

    If every option exists, Proclet execute the job as cron(8)

      $proclet->service(
          code => sub {
              scheduled_work();
          },
          tag => 'cron',
          every => '0 12 * * *', #everyday at 12:00am
      );
    

• run

  run services. Proclet does start services by defined order

Masahiro Nagano <kazeburo {at} gmail.com>

Proc::Launcher::Manager, related module Parallel::Prefork, Proclet used internally

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.