#!/usr/bin/env perl
use strict;
use FindBin;
FindBin::again();
use Path::Class 'dir';
BEGIN {
# stuff useful locations into @INC
unshift @INC,
dir($FindBin::RealBin)->parent->subdir('lib')->stringify,
dir($FindBin::RealBin, 'lib')->stringify;
unshift @INC,
split m/:/, ($ENV{NETDISCO_INC} || '');
}
use Dancer qw/:moose :script/;
BEGIN {
warning sprintf "App::Netdisco %s backend", ($App::Netdisco::VERSION || 'HEAD');
# this can take a few seconds - only do it once
use Net::Domain 'hostfqdn';
info 'resolving backend hostname...';
setting('workers')->{'BACKEND'} ||= (hostfqdn || 'fqdn-undefined');
}
use App::Netdisco::Util::MCE; # set $0 and parse maxworkers
use NetAddr::IP::Lite ':lower'; # to quench AF_INET6 symbol errors
use MCE::Signal '-setpgrp';
use MCE::Flow Sereal => 1;
# set temporary MCE files' location in home directory
my $home = ($ENV{NETDISCO_HOME} || $ENV{HOME});
my $tmp_dir = ($ENV{NETDISCO_TEMP} || dir($home, 'tmp'));
mkdir $tmp_dir if ! -d $tmp_dir;
# process-table text
prctl 'nd2: master';
# shared local job queue
my $queue = MCE::Queue->new;
# support a scheduler-only node
setting('workers')->{'no_manager'} = 1
if setting('workers')->{tasks} eq '0';
# MCE::Util has a limit of ncpu if AUTO is used in max_workers,
# so we parse the field ourselves.
my $max_workers = parse_max_workers( setting('workers')->{tasks} ) || 0;
mce_flow {
task_name => [qw/ scheduler manager poller /],
max_workers => [ 1, 1, $max_workers ],
tmp_dir => $tmp_dir,
on_post_exit => sub { MCE->restart_worker },
}, _mk_wkr('Scheduler'), _mk_wkr('Manager'), _mk_wkr('Poller');
sub _mk_wkr {
my $role = shift;
return sub {
my $self = shift;
$self->{queue} = $queue;
prctl sprintf 'nd2: #%s %s: init', MCE->wid, lc($role);
info sprintf 'applying role %s to worker %s', $role, MCE->wid;
# post-fork, become manager, scheduler, poller, etc
Role::Tiny->apply_roles_to_object(
$self => "App::Netdisco::Backend::Role::$role");
$self->worker_begin if $self->can('worker_begin');
$self->worker_body;
};
}
=head1 NAME
netdisco-backend-fg - Job Control for Netdisco
=head1 SEE ALSO
=over 4
=item *
L<App::Netdisco>
=back
=cut