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package App::Beam::Command;
use strict;
use Carp;
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT_OK = qw(CHAN_STDOUT CHAN_STDERR);
our %EXPORT_TAGS = (
channels => [ qw(CHAN_STDOUT CHAN_STDERR) ]
);
use IPC::Open3;
use Symbol 'gensym';
use POSIX qw(:sys_wait_h);
sub new {
my $class = shift;
return bless { argv => \@_ }, $class;
}
sub add {
my $self = shift;
push @{$self->{argv}}, @_;
}
use constant {
CHAN_STDOUT => 0,
CHAN_STDERR => 1
};
sub start_log {
my ($self, $chan, $rfd) = @_;
if (exists($self->{log}) && defined($self->{log}[$chan])) {
local $^F = fileno($rfd);
my $pid = fork();
if ($pid == 0) {
local $_ = $rfd;
&{$self->{log}[CHAN_STDERR]};
exit(0);
} else {
push @{$self->{pids}}, $pid;
return undef;
}
}
return $rfd;
}
sub run {
my $self = shift;
my $out = gensym;
my $err = gensym;
return $self->{status} if exists($self->{status});
eval {
push @{$self->{pids}},
open3(\*STDIN, $out, $err, @{$self->{argv}});
$out = $self->start_log(CHAN_STDOUT, $out);
$err = $self->start_log(CHAN_STDERR, $err);
do {
my $pid = waitpid(-1, 0);
if ($pid > 0) {
@{$self->{pids}} = grep { $pid != $_ } @{$self->{pids}};
}
} while ($#{$self->{pids}} >= 0);
};
if ($@) {
$self->{status} = $@;
} else {
$self->{status} = $?;
local $/ = undef;
$self->{channel}[CHAN_STDOUT] = defined($out) ? <$out> : undef;
$self->{channel}[CHAN_STDERR] = defined($err) ? <$err> : undef;
}
return $self->{status};
}
sub set_logger {
my ($self, $chan, $fun) = @_;
$self->{log}[$chan] = $fun;
}
sub restart {
my $self = shift;
delete $self->{status};
delete $self->{channel};
delete $self->{pids};
return $self->run;
}
sub status {
my $self = shift;
return undef unless exists $self->{status};
return $self->{status};
}
sub channel {
my ($self, $chan) = @_;
return undef
unless (exists($self->{channel}) && defined($self->{channel}[$chan]));
open(my $fd, '<', \$self->{channel}[$chan]) or croak "can't dup: $!";
return $fd;
}
sub argv {
my ($self) = @_;
return @{$self->{argv}};
}
sub command_line {
my ($self) = @_;
return join(' ', $self->argv);
}
sub command_name {
my ($self) = @_;
return $self->{argv}[0];
}
sub exit_code {
my ($self) = @_;
my $code = $self->status;
return -1 if (!defined($code) || $code == -1 || ($code & 127));
return $code >> 8;
}
1;
|
