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# Copyright © 2009-2013 Bernhard M. Wiedemann
# Copyright © 2012-2015 SUSE LLC
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, see <http://www.gnu.org/licenses/>.
# this class is what presents $backend in isotovideo and its code runs
# in the main process. But its main task is to start a 2nd process and talk to it over
# a PIPE
# in that 2nd process runs the actual backend, derived from backend::baseclass
package backend::driver;
use strict;
use Carp qw(cluck carp croak confess);
use JSON qw(to_json);
use File::Path qw(remove_tree);
use IO::Select;
use POSIX qw(_exit);
require IPC::System::Simple;
use autodie qw(:all);
use myjsonrpc;
# TODO: move the whole printing out of bmwqemu
sub diag {
my ($text) = @_;
print "$text\n";
}
sub new {
my ($class, $name) = @_;
my $self = bless({class => $class}, $class);
require "backend/$name.pm"; ## no critic
$self->{backend} = "backend::$name"->new();
$self->{backend_name} = $name;
$self->start();
return $self;
}
sub start {
my ($self) = @_;
my $p1, my $p2;
pipe($p1, $p2) or die "pipe: $!";
$self->{from_parent} = $p1;
$self->{to_child} = $p2;
$p1 = undef;
$p2 = undef;
pipe($p1, $p2) or die "pipe: $!";
$self->{to_parent} = $p2;
$self->{from_child} = $p1;
printf STDERR "$$: to_child %d, from_child %d\n", fileno($self->{to_child}), fileno($self->{from_child});
my $pid = fork();
die "fork failed" unless defined $pid;
if ($pid == 0) {
$SIG{TERM} = 'DEFAULT';
$SIG{INT} = 'DEFAULT';
$SIG{HUP} = 'DEFAULT';
$SIG{CHLD} = 'DEFAULT';
$0 = "$0: backend";
# now initialize opencv
require cv;
cv::init();
require tinycv;
$self->{backend}->run(fileno($self->{from_parent}), fileno($self->{to_parent}));
_exit(0);
}
else {
$self->{backend_pid} = $pid;
}
}
sub extract_assets {
my $self = shift;
$self->{backend}->do_extract_assets(@_);
}
sub stop {
my ($self, $cmd) = @_;
return unless ($self->{backend_pid});
$self->stop_backend() if $self->{from_child};
close($self->{from_child}) if $self->{from_child};
$self->{from_child} = undef;
close($self->{to_child}) if ($self->{to_child});
$self->{to_child} = undef;
waitpid($self->{backend_pid}, 0) if $self->{backend_pid};
$self->{backend_pid} = undef;
}
# new api
sub start_vm {
my $self = shift;
my $json = to_json({backend => $self->{backend_name}});
open(my $runf, ">", 'backend.run');
print $runf "$json\n";
close $runf;
# remove old screenshots
print "remove_tree $bmwqemu::screenshotpath\n";
remove_tree($bmwqemu::screenshotpath);
mkdir $bmwqemu::screenshotpath;
$self->_send_json({cmd => 'start_vm'}) || die "failed to start VM";
return 1;
}
sub stop_backend {
my ($self) = @_;
$self->_send_json({cmd => 'stop_vm'});
# remove if still existant
unlink('backend.run') if -e 'backend.run';
return;
}
# new api end
sub mouse_hide {
my ($self, $border_offset) = @_;
$border_offset ||= 0;
# TODO: come up with a better solution - this is qemu specific.
my $counter = 0;
my $rsp;
while ($counter < 10) {
$rsp = $self->_send_json({cmd => 'mouse_hide', arguments => {border_offset => $border_offset}});
last if $rsp->{absolute} ne '0';
sleep 1;
$counter++;
}
return $rsp;
}
# virtual methods end
sub _send_json {
my ($self, $cmd) = @_;
croak "no backend running" unless ($self->{to_child});
my $token = myjsonrpc::send_json($self->{to_child}, $cmd);
my $rsp = myjsonrpc::read_json($self->{from_child}, $token);
unless (defined $rsp) {
# this might have been closed by signal handler
no autodie qw(close);
close($self->{from_child});
$self->{from_child} = undef;
$self->stop();
return;
}
return $rsp->{rsp};
}
1;
# vim: set sw=4 et:
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