Ravada.pm 32.8 KB
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package Ravada;

use warnings;
use strict;

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our $VERSION = '0.2.4';
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use Carp qw(carp croak);
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use Data::Dumper;
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use DBIx::Connector;
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use Hash::Util qw(lock_hash);
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use Moose;
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use POSIX qw(WNOHANG);
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use YAML;

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use Socket qw( inet_aton inet_ntoa );

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use Ravada::Auth;
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use Ravada::Request;
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use Ravada::VM::KVM;
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use Ravada::VM::Void;
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=head1 NAME

Ravada - Remove Virtual Desktop Manager

=head1 SYNOPSIS

  use Ravada;

  my $ravada = Ravada->new()

=cut

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our $FILE_CONFIG = "/etc/ravada.conf";

###########################################################################

our $CONNECTOR;
our $CONFIG = {};
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our $DEBUG;
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our $CAN_FORK = 1;
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our $CAN_LXC = 0;
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# Seconds to wait for other long process
our $SECONDS_WAIT_CHILDREN = 2;
# Limit for long processes
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our $LIMIT_PROCESS = 2;
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our $LIMIT_HUGE_PROCESS = 1;

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our $DIR_SQL = "sql/mysql";
$DIR_SQL = "/usr/share/doc/ravada/sql/mysql" if ! -e $DIR_SQL;
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# LONG commands take long
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our %HUGE_COMMAND = map { $_ => 1 } qw(download);
our %LONG_COMMAND =  map { $_ => 1 } (qw(prepare_base remove_base screenshot ), keys %HUGE_COMMAND);
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has 'vm' => (
          is => 'ro'
        ,isa => 'ArrayRef'
       ,lazy => 1
     , builder => '_create_vm'
);

has 'connector' => (
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        is => 'rw'
);

has 'config' => (
    is => 'ro'
    ,isa => 'Str'
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);

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has 'warn_error' => (
    is => 'rw'
    ,isa => 'Bool'
    ,default => sub { 1 }
);

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=head2 BUILD

Internal constructor

=cut


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sub BUILD {
    my $self = shift;
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    if ($self->config()) {
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        _init_config($self->config);
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    } else {
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        _init_config($FILE_CONFIG) if -e $FILE_CONFIG;
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    }
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    if ( $self->connector ) {
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        $CONNECTOR = $self->connector
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    } else {
        $CONNECTOR = $self->_connect_dbh();
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        $self->connector($CONNECTOR);
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    }
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    Ravada::Auth::init($CONFIG);
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    $self->_create_tables();
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    $self->_upgrade_tables();
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    $self->_update_data();
}

sub _update_isos {
    my $self = shift;
    my $table = 'iso_images';
    my $field = 'name';
    my %data = (
        zesty => {
                    name => 'Ubuntu Zesty Zapus'
            ,description => 'Ubuntu 17.04 Zesty Zapus 64 bits'
                   ,arch => 'amd64'
                    ,xml => 'yakkety64-amd64.xml'
             ,xml_volume => 'yakkety64-volume.xml'
                    ,url => 'http://releases.ubuntu.com/17.04/'
                ,file_re => ,'ubuntu-17.04.*desktop-amd64.iso'
                ,md5_url => ,'http://releases.ubuntu.com/17.04/MD5SUMS'
        }
    );

    my $sth_search = $CONNECTOR->dbh->prepare("SELECT id FROM $table WHERE $field = ?");
    for my $name (keys %data) {
        my $row = $data{$name};
        $sth_search->execute($row->{$field});
        my ($id) = $sth_search->fetchrow;
        next if $id;
        warn("INFO: updating $table : $row->{$field}\n");

        my $sql =
            "INSERT INTO iso_images "
            ."("
            .join(" , ", sort keys %{$data{$name}})
            .")"
            ." VALUES ( "
            .join(" , ", map { "?" } keys %{$data{$name}})
            ." )"
        ;
        my $sth = $CONNECTOR->dbh->prepare($sql);
        $sth->execute(map { $data{$name}->{$_} } sort keys %{$data{$name}});
        $sth->finish;
    }
}

sub _update_data {
    my $self = shift;
    $self->_update_isos();
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}

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sub _upgrade_table {
    my $self = shift;
    my ($table, $field, $definition) = @_;
    my $dbh = $CONNECTOR->dbh;

    my $sth = $dbh->column_info(undef,undef,$table,$field);
    my $row = $sth->fetchrow_hashref;
    $sth->finish;
    return if $row;

    warn "INFO: adding $field $definition to $table\n";
    $dbh->do("alter table $table add $field $definition");
}

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sub _create_table {
    my $self = shift;
    my $table = shift;

    my $sth = $CONNECTOR->dbh->table_info('%',undef,$table,'TABLE');
    my $info = $sth->fetchrow_hashref();
    $sth->finish;
    return if keys %$info;

    warn "INFO: creating table $table\n";
    my $file_sql = "$DIR_SQL/$table.sql";
    open my $in,'<',$file_sql or die "$! $file_sql";
    my $sql = join " ",<$in>;
    close $in;

    $CONNECTOR->dbh->do($sql);
    return 1;
}

sub _insert_data {
    my $self = shift;
    my $table = shift;

    my $file_sql =  "$DIR_SQL/../data/insert_$table.sql";
    return if ! -e $file_sql;

    warn "INFO: inserting data for $table\n";
    open my $in,'<',$file_sql or die "$! $file_sql";
    my $sql = '';
    while (my $line = <$in>) {
        $sql .= $line;
        next if $sql !~ /\w/ || $sql !~ /;\s*$/;
        $CONNECTOR->dbh->do($sql);
        $sql = '';
    }
    close $in;

}

sub _create_tables {
    my $self = shift;
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    return if $CONNECTOR->dbh->{Driver}{Name} !~ /mysql/i;

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    opendir my $ls,$DIR_SQL or die "$! $DIR_SQL";
    while (my $file = readdir $ls) {
        my ($table) = $file =~ m{(.*)\.sql$};
        next if !$table;
        $self->_insert_data($table)     if $self->_create_table($table);
    }
    closedir $ls;
}

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sub _upgrade_tables {
    my $self = shift;
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    return if $CONNECTOR->dbh->{Driver}{Name} !~ /mysql/i;

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    $self->_upgrade_table('file_base_images','target','varchar(64) DEFAULT NULL');
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    $self->_upgrade_table('vms','vm_type',"char(20) NOT NULL DEFAULT 'KVM'");
    $self->_upgrade_table('requests','at_time','int(11) DEFAULT NULL');
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    $self->_upgrade_table('iso_images','md5_url','varchar(255)');
    $self->_upgrade_table('iso_images','file_re','char(64)');
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    $self->_upgrade_table('iso_images','device','varchar(255)');
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    $self->_upgrade_table('networks','requires_password','int(11)');
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}


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sub _connect_dbh {
    my $driver= ($CONFIG->{db}->{driver} or 'mysql');;
    my $db_user = ($CONFIG->{db}->{user} or getpwnam($>));;
    my $db_pass = ($CONFIG->{db}->{password} or undef);
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    my $db = ( $CONFIG->{db}->{db} or 'ravada' );
    return DBIx::Connector->new("DBI:$driver:$db"
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                        ,$db_user,$db_pass,{RaiseError => 1
                        , PrintError=> 0 });

}

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=head2 display_ip
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Returns the default display IP read from the config file
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=cut
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sub display_ip {
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    my $ip = $CONFIG->{display_ip};
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    return $ip if $ip;
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}

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sub _init_config {
    my $file = shift;
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    my $connector = shift;
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    confess "Deprecated connector" if $connector;
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    $CONFIG = YAML::LoadFile($file);
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    $LIMIT_PROCESS = $CONFIG->{limit_process} 
        if $CONFIG->{limit_process} && $CONFIG->{limit_process}>1;
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#    $CONNECTOR = ( $connector or _connect_dbh());
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}

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sub _create_vm_kvm {
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    my $self = shift;
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    my $cmd_qemu_img = `which qemu-img`;
    chomp $cmd_qemu_img;

    return(undef,"ERROR: Missing qemu-img") if !$cmd_qemu_img;
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    my $vm_kvm;
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    eval { $vm_kvm = Ravada::VM::KVM->new( connector => ( $self->connector or $CONNECTOR )) };
    my $err_kvm = $@;
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    my ($internal_vm , $storage);
    eval {
        $storage = $vm_kvm->dir_img();
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        $internal_vm = $vm_kvm->vm;
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    };
    $vm_kvm = undef if $@ || !$internal_vm || !$storage;
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    $err_kvm .= ($@ or '');
    return ($vm_kvm,$err_kvm);
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}

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=head2 disconnect_vm

Disconnect all the Virtual Managers connections.

=cut


sub disconnect_vm {
    my $self = shift;
    $self->_disconnect_vm();
}

sub _disconnect_vm{
    my $self = shift;
    return $self->_connect_vm(0);
}

sub _connect_vm {
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    my $self = shift;
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    my $connect = shift;
    $connect = 1 if !defined $connect;

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    my @vms;
    eval { @vms = $self->vm };
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    warn $@ if $@ && $self->warn_error;
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    return if $@ && $@ =~ /No VMs found/i;
    die $@ if $@;

    return if !scalar @vms;
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    for my $n ( 0 .. $#{$self->vm}) {
        my $vm = $self->vm->[$n];
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        if (!$connect) {
            $vm->disconnect();
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        } else {
            $vm->connect();
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        }
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    }
}

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sub _create_vm {
    my $self = shift;

    my @vms = ();

    my ($vm_kvm, $err_kvm) = $self->_create_vm_kvm();
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    warn $err_kvm if $err_kvm && $0 !~ /\.t$/;
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    my $err = $err_kvm;

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    push @vms,($vm_kvm) if $vm_kvm;

    my $vm_lxc;
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    if ($CAN_LXC) {
        eval { $vm_lxc = Ravada::VM::LXC->new( connector => ( $self->connector or $CONNECTOR )) };
        push @vms,($vm_lxc) if $vm_lxc;
        my $err_lxc = $@;
        $err .= "\n$err_lxc" if $err_lxc;
    }
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    if (!@vms) {
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        warn "No VMs found: $err\n" if $self->warn_error;
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    }
    return \@vms;

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}

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sub _check_vms {
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    my $self = shift;

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    my @vm;
    eval { @vm = @{$self->vm} };
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    for my $n ( 0 .. $#vm ) {
        if ($vm[$n] && ref $vm[$n] =~ /KVM/i) {
            if (!$vm[$n]->is_alive) {
                warn "$vm[$n] dead" if $DEBUG;
                $vm[$n] = $self->_create_vm_kvm();
            }
        }
    }
}

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=head2 create_domain

Creates a new domain based on an ISO image or another domain.

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  my $domain = $ravada->create_domain(
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         name => $name
    , id_iso => 1
  );


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  my $domain = $ravada->create_domain(
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         name => $name
    , id_base => 3
  );


=cut


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sub create_domain {
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    my $self = shift;

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    my %args = @_;

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    croak "Argument id_owner required "
        if !$args{id_owner};

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    my $vm_name = $args{vm};
    delete $args{vm};
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    my $request = ( $args{request} or undef);
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    my $vm;
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    if ($vm_name) {
        $vm = $self->search_vm($vm_name);
        confess "ERROR: vm $vm_name not found"  if !$vm;
    }
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    $vm = $self->vm->[0]               if !$vm;
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    confess "No vm found"   if !$vm;

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    carp "WARNING: no VM defined, we will use ".$vm->name
        if !$vm_name;
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    confess "I can't find any vm ".Dumper($self->vm) if !$vm;
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    return $vm->create_domain(@_);
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}

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=head2 remove_domain

Removes a domain

  $ravada->remove_domain($name);

=cut

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sub remove_domain {
    my $self = shift;
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    my %arg = @_;

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    confess "Argument name required "
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        if !$arg{name};

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    confess "Argument uid required "
        if !$arg{uid};
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    lock_hash(%arg);

    my $domain = $self->search_domain($arg{name}, 1)
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        or die "ERROR: I can't find domain '$arg{name}', maybe already removed.";
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    my $user = Ravada::Auth::SQL->search_by_id( $arg{uid});
    $domain->remove( $user);
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}

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=head2 search_domain

  my $domain = $ravada->search_domain($name);

=cut

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sub search_domain {
    my $self = shift;
    my $name = shift;
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    my $import = shift;
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    my $vm = $self->search_vm('Void');
    warn "No Void VM" if !$vm;
    return if !$vm;

    my $domain = $vm->search_domain($name, $import);
    return $domain if $domain;

    my @vms;
    eval { @vms = $self->vm };
    return if $@ && $@ =~ /No VMs found/i;
    die $@ if $@;

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    for my $vm (@{$self->vm}) {
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        my $domain = $vm->search_domain($name, $import);
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        next if !$domain;
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        next if !$domain->_select_domain_db && !$import;
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        my $id;
        eval { $id = $domain->id };
        # TODO import the domain in the database with an _insert_db or something
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        warn $@ if $@   && $DEBUG;
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        return $domain if $id || $import;
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    }
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    return;
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}
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=head2 search_domain_by_id
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  my $domain = $ravada->search_domain_by_id($id);

=cut

sub search_domain_by_id {
    my $self = shift;
    my $id = shift  or confess "ERROR: missing argument id";

    my $sth = $CONNECTOR->dbh->prepare("SELECT name FROM domains WHERE id=?");
    $sth->execute($id);
    my ($name) = $sth->fetchrow;
    confess "Unknown domain id=$id" if !$name;

    return $self->search_domain($name);
}
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=head2 list_domains

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List all created domains
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  my @list = $ravada->list_domains();

=cut

sub list_domains {
    my $self = shift;
    my @domains;
    for my $vm (@{$self->vm}) {
        for my $domain ($vm->list_domains) {
            push @domains,($domain);
        }
    }
    return @domains;
}

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=head2 list_domains_data

List all domains in raw format. Return a list of id => { name , id , is_active , is_base }

   my $list = $ravada->list_domains_data();

   $c->render(json => $list);

=cut

sub list_domains_data {
    my $self = shift;
    my @domains;
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    my $sth = $CONNECTOR->dbh->prepare(
        "SELECT * FROM domains ORDER BY name"
    );
    $sth->execute;
    while (my $row = $sth->fetchrow_hashref) {
        push @domains,($row);
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    }
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    $sth->finish;
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    return \@domains;
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}

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# sub list_domains_data {
#     my $self = shift;
#     my @domains;
#     for my $domain ($self->list_domains()) {
#         eval { $domain->id };
#         warn $@ if $@;
#         next if $@;
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#         push @domains, {                id => $domain->id
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#                                     , name => $domain->name
#                                   ,is_base => $domain->is_base
#                                 ,is_active => $domain->is_active
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#                            }
#     }
#     return \@domains;
# }

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=head2 list_bases

List all base domains

  my @list = $ravada->list_domains();


=cut

sub list_bases {
    my $self = shift;
    my @domains;
    for my $vm (@{$self->vm}) {
        for my $domain ($vm->list_domains) {
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            eval { $domain->id };
            warn $@ if $@;
            next    if $@;
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            push @domains,($domain) if $domain->is_base;
        }
    }
    return @domains;
}

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=head2 list_bases_data

List information about the bases

=cut

sub list_bases_data {
    my $self = shift;
    my @data;
    for ($self->list_bases ) {
        push @data,{ id => $_->id , name => $_->name };
    }
    return \@data;
}

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=head2 list_images

List all ISO images

=cut

sub list_images {
    my $self = shift;
    my @domains;
    my $sth = $CONNECTOR->dbh->prepare(
        "SELECT * FROM iso_images ORDER BY name"
    );
    $sth->execute;
    while (my $row = $sth->fetchrow_hashref) {
        push @domains,($row);
    }
    $sth->finish;
    return @domains;
}

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=head2 list_images_data

List information about the images

=cut

sub list_images_data {
    my $self = shift;
    my @data;
    for ($self->list_images ) {
        push @data,{ id => $_->{id} , name => $_->{name} };
    }
    return \@data;
}

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=pod

sub _list_images_lxc {
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    my $self = shift;
    my @domains;
    my $sth = $CONNECTOR->dbh->prepare(
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        "SELECT * FROM lxc_templates ORDER BY name"
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    );
    $sth->execute;
    while (my $row = $sth->fetchrow_hashref) {
        push @domains,($row);
    }
    $sth->finish;
    return @domains;
}

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sub _list_images_data_lxc {
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    my $self = shift;
    my @data;
    for ($self->list_images_lxc ) {
        push @data,{ id => $_->{id} , name => $_->{name} };
    }
    return \@data;
}

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=cut
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=head2 remove_volume

  $ravada->remove_volume($file);

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=cut

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sub remove_volume {
    my $self = shift;

    my $file = shift;
    my ($name) = $file =~ m{.*/(.*)};

    my $removed = 0;
    for my $vm (@{$self->vm}) {
        my $vol = $vm->search_volume($name);
        next if !$vol;

        $vol->delete();
        $removed++;
    }
    if (!$removed && -e $file ) {
        warn "volume $file not found. removing file $file.\n";
        unlink $file or die "$! $file";
    }

}
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=head2 clean_killed_requests

Before processing requests, old killed requests must be cleaned.

=cut

sub clean_killed_requests {
    my $self = shift;
    my $sth = $CONNECTOR->dbh->prepare("SELECT id FROM requests "
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        ." WHERE status <> 'done' AND STATUS <> 'requested'"
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    );
    $sth->execute;
    while (my ($id) = $sth->fetchrow) {
        my $req = Ravada::Request->open($id);
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        $req->status("done","Killed ".$req->command." before completion");
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    }

}

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=head2 process_requests

This is run in the ravada backend. It processes the commands requested by the fronted

  $ravada->process_requests();

=cut

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sub process_requests {
    my $self = shift;
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    my $debug = shift;
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    my $dont_fork = shift;
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    my $long_commands = (shift or 0);
    my $short_commands = (shift or 0);
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    $self->_wait_pids_nohang();

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    my $sth = $CONNECTOR->dbh->prepare("SELECT id,id_domain FROM requests "
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        ." WHERE "
        ."    ( status='requested' OR status like 'retry %' OR status='waiting')"
        ."   AND ( at_time IS NULL  OR at_time = 0 OR at_time<=?) "
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        ." ORDER BY date_req"
    );
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    $sth->execute(time);

    my $debug_type = '';
    $debug_type = 'long' if $long_commands;
    $debug_type = 'short' if $short_commands || !$long_commands;
    $debug_type = 'all' if $long_commands && $short_commands;

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    while (my ($id_request,$id_domain)= $sth->fetchrow) {
        my $req = Ravada::Request->open($id_request);
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        if ( ($long_commands && 
                (!$short_commands && !$LONG_COMMAND{$req->command}))
            ||(!$long_commands && $LONG_COMMAND{$req->command})
        ) {
            warn "[$debug_type,$long_commands,$short_commands] $$ skipping request "
                .$req->command  if $DEBUG;
            next;
        }
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        next if $req->command !~ /shutdown/i
            && $self->_domain_working($id_domain, $id_request);
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        warn "[$debug_type] $$ executing request ".$req->id." ".$req->status()." "
            .$req->command
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            ." ".Dumper($req->args) if $DEBUG || $debug;
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        my ($n_retry) = $req->status() =~ /retry (\d+)/;
        $n_retry = 0 if !$n_retry;
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        my $err = $self->_execute($req, $dont_fork);
        $req->error($err)   if $err;
        if ($err && $err =~ /libvirt error code: 38/) {
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            if ( $n_retry < 3) {
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                warn $req->id." ".$req->command." to retry" if $DEBUG;
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                $req->status("retry ".++$n_retry)
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            }
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        }
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        next if !$DEBUG && !$debug;

        sleep 1;
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        warn "req ".$req->id." , command: ".$req->command." , status: ".$req->status()
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            ." , error: '".($req->error or 'NONE')."'\n"  if $DEBUG;
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    }
    $sth->finish;
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}

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=head2 process_long_requests
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Process requests that take log time. It will fork on each one

=cut

sub process_long_requests {
    my $self = shift;
    my ($debug,$dont_fork) = @_;

    $self->_disconnect_vm();
    return $self->process_requests($debug, $dont_fork, 1);
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}

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=head2 process_all_requests

Process all the requests, long and short

=cut

sub process_all_requests {

    my $self = shift;
    my ($debug,$dont_fork) = @_;

    $self->process_requests($debug, $dont_fork,1,1);

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}

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sub _domain_working {
    my $self = shift;
    my ($id_domain, $id_request) = @_;

    confess "Missing id_request" if !defined$id_request;

    if (!$id_domain) {
        my $req = Ravada::Request->open($id_request);
        $id_domain = $req->defined_arg('id_base');
        if (!$id_domain) {
            my $domain_name = $req->defined_arg('name');
            return if !$domain_name;
            my $domain = $self->search_domain($domain_name) or return;
            $id_domain = $domain->id;
            if (!$id_domain) {
                warn Dumper($req);
                return;
            }
        }
    }
    my $sth = $CONNECTOR->dbh->prepare("SELECT id, status FROM requests "
        ." WHERE id <> ? AND id_domain=? AND (status <> 'requested' AND status <> 'done')");
    $sth->execute($id_request, $id_domain);
    my ($id, $status) = $sth->fetchrow;
#    warn "CHECKING DOMAIN WORKING "
#        ."[$id_request] id_domain $id_domain working in request ".($id or '<NULL>')
#            ." status: ".($status or '<UNDEF>');
    return $id;
}

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sub _process_all_requests_dont_fork {
    my $self = shift;
    my $debug = shift;

    return $self->process_requests($debug,1, 1, 1);
}

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sub _process_requests_dont_fork {
    my $self = shift;
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    my $debug = shift;
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    return $self->process_requests($debug, 1);
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}
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=head2 list_vm_types

Returnsa list ofthe types of Virtual Machines available on this system

=cut

sub list_vm_types {
    my $self = shift;
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    my %type;
    for my $vm (@{$self->vm}) {
            my ($name) = ref($vm) =~ /.*::(.*)/;
            $type{$name}++;
    }
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    return keys %type;
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}

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sub _execute {
    my $self = shift;
    my $request = shift;
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    my $dont_fork = shift;
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    my $sub = $self->_req_method($request->command);

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    confess "Unknown command ".$request->command
            if !$sub;
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    if ($dont_fork || !$CAN_FORK || !$LONG_COMMAND{$request->command}) {
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        eval { $sub->($self,$request) };
        my $err = ($@ or '');
        $request->error($err);
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        $request->status('done') if $request->status() ne 'done';
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        return $err;
    }
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    $self->_wait_pids_nohang();
    return if $self->_wait_children($request);

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    $request->status('working');
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    my $pid = fork();
    die "I can't fork" if !defined $pid;
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    if ( $pid == 0 ) {
        $self->_do_execute_command($sub, $request) 
    } else {
        $self->_add_pid($pid, $request->id);
    }
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#    $self->_connect_vm_kvm();
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    return '';
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}

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sub _do_execute_command {
    my $self = shift;
    my ($sub, $request) = @_;

#    if ($DEBUG ) {
#        mkdir 'log' if ! -e 'log';
#        open my $f_out ,'>', "log/fork_$$.out";
#        open my $f_err ,'>', "log/fork_$$.err";
#        $| = 1;
#        local *STDOUT = $f_out;
#        local *STDERR = $f_err;
#    }

    eval {
        $self->_connect_vm();
        $sub->($self,$request);
        $self->_disconnect_vm();
    };
    my $err = ( $@ or '');
    $request->error($err);
    $request->status('done') if $request->status() ne 'done';
    exit;

}

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sub _cmd_domdisplay {
    my $self = shift;
    my $request = shift;

    my $name = $request->args('name');
    confess "Unknown name for request ".Dumper($request)  if!$name;
    my $domain = $self->search_domain($request->args->{name});
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    my $user = Ravada::Auth::SQL->search_by_id( $request->args->{uid});
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    $request->error('');
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    my $display = $domain->display($user);
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    $request->result({display => $display});

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}

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sub _cmd_screenshot {
    my $self = shift;
    my $request = shift;

    my $id_domain = $request->args('id_domain');
    my $domain = $self->search_domain_by_id($id_domain);
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    my $bytes = 0;
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    if (!$domain->can_screenshot) {
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        die "I can't take a screenshot of the domain ".$domain->name;
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    } else {
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        $bytes = $domain->screenshot($request->args('filename'));
        $bytes = $domain->screenshot($request->args('filename'))    if !$bytes;
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    }
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    $request->error("No data received") if !$bytes;
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}


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sub _cmd_create{
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    my $self = shift;
    my $request = shift;

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    $request->status('creating domain');
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    warn "$$ creating domain"   if $DEBUG;
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    my $domain;
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    $domain = $self->create_domain(%{$request->args},request => $request);
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    my $msg = '';
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    if ($domain) {
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       $msg = 'Domain '
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            ."<a href=\"/machine/view/".$domain->id.".html\">"
            .$request->args('name')."</a>"
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            ." created."
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        ;
    }

    $request->status('done',$msg);
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}

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sub _wait_children {
    my $self = shift;
    my $req = shift or confess "Missing request";

    my $try = 0;
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    for ( 1 .. $SECONDS_WAIT_CHILDREN ) {
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        my $n_pids = scalar keys %{$self->{pids}};

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        my $msg;
        if ($HUGE_COMMAND{$req->command}) {
            if ( $n_pids < $LIMIT_HUGE_PROCESS) {
                $msg = $req->id." ".$req->command
                ." waiting for processes to finish $n_pids"
                ." of $LIMIT_HUGE_PROCESS ";
                warn $msg if $DEBUG;
                return;
            }
        } elsif ( $n_pids < $LIMIT_PROCESS) {
            $msg = $req->id." ".$req->command
                ." waiting for processes to finish $n_pids"
                ." of $LIMIT_PROCESS ";
            warn $msg if $DEBUG;
            return;
        }
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        $self->_wait_pids_nohang();
        sleep 1;

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        next if $try++;

        $req->error($msg);
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    }
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    return scalar keys %{$self->{pids}};
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}

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sub _wait_pids_nohang {
    my $self = shift;
    return if !keys %{$self->{pids}};

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    for my $pid ( keys %{$self->{pids}}) {
        my $kid = waitpid($pid , WNOHANG);
        next if !$kid || $kid == -1;
        $self->_set_req_done($kid);
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        $self->_delete_pid($kid);
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    }
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}

sub _set_req_done {
    my $self = shift;
    my $pid = shift;

    my $id_request = $self->{pids}->{$pid};
    return if !$id_request;

    my $req = Ravada::Request->open($id_request);
    $req->status('done')    if $req->status =~ /working/i;
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}

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sub _wait_pids {
    my $self = shift;
    my $request = shift;

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    $request->status('waiting for other tasks')
        if $request && $request->status !~ /waiting/i;
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    for my $pid ( keys %{$self->{pids}}) {
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        $request->status("waiting for pid $pid")
            if $request && $request->status !~ /waiting/i;
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#        warn "Checking for pid '$pid' created at ".localtime($self->{pids}->{$pid});
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        my $kid = waitpid($pid,0);
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#        warn "Found $kid";
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        $self->_set_req_done($pid);

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        $self->_delete_pid($kid);
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        return if $kid  == $pid;
    }
}

sub _add_pid {
    my $self = shift;
    my $pid = shift;
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    my $id_req = shift;
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    $self->{pids}->{$pid} = $id_req;
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}

sub _delete_pid {
    my $self = shift;
    my $pid = shift;

    delete $self->{pids}->{$pid};
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}

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sub _cmd_remove {
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    my $self = shift;
    my $request = shift;

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    confess "Unknown user id ".$request->args->{uid}
        if !defined $request->args->{uid};

    $self->remove_domain(name => $request->args('name'), uid => $request->args('uid'));
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}
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sub _cmd_pause {
    my $self = shift;
    my $request = shift;

    my $name = $request->args('name');
    my $domain = $self->search_domain($name);
    die "Unknown domain '$name'" if !$domain;

    my $uid = $request->args('uid');
    my $user = Ravada::Auth::SQL->search_by_id($uid);

    $domain->pause($user);

    $request->status('done');

}

sub _cmd_resume {
    my $self = shift;
    my $request = shift;

    my $name = $request->args('name');
    my $domain = $self->search_domain($name);
    die "Unknown domain '$name'" if !$domain;

    my $uid = $request->args('uid');
    my $user = Ravada::Auth::SQL->search_by_id($uid);

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    $domain->resume(
        remote_ip => $request->args('remote_ip')
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        ,user => $user
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    );
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    $request->status('done');

}


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sub _cmd_open_iptables {
    my $self = shift;
    my $request = shift;

    my $uid = $request->args('uid');
    my $user = Ravada::Auth::SQL->search_by_id($uid);

    my $domain = $self->search_domain_by_id($request->args('id_domain'));
    die "Unknown domain" if !$domain;

    $domain->open_iptables(
        remote_ip => $request->args('remote_ip')
        ,uid => $user->id
    );
}

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sub _cmd_start {
    my $self = shift;
    my $request = shift;

    my $name = $request->args('name');
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    my $domain = $self->search_domain($name);
    die "Unknown domain '$name'" if !$domain;
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    my $uid = $request->args('uid');
    my $user = Ravada::Auth::SQL->search_by_id($uid);

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    $domain->start(user => $user, remote_ip => $request->args('remote_ip'));
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    my $msg = 'Domain '
            ."<a href=\"/machine/view/".$domain->id.".html\">"
            .$request->args('name')."</a>"
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            ." started"
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        ;
    $request->status('done', $msg);
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}

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sub _cmd_prepare_base {
    my $self = shift;
    my $request = shift;

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    my $id_domain = $request->id_domain   or confess "Missing request id_domain";
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    my $uid = $request->args('uid')     or confess "Missing argument uid";

    my $user = Ravada::Auth::SQL->search_by_id( $uid);

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    my $domain = $self->search_domain_by_id($id_domain);
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    die "Unknown domain id '$id_domain'\n" if !$domain;
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    $domain->prepare_base($user);
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}

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sub _cmd_remove_base {
    my $self = shift;
    my $request = shift;

    my $id_domain = $request->id_domain or confess "Missing request id_domain";
    my $uid = $request->args('uid')     or confess "Missing argument uid";

    my $user = Ravada::Auth::SQL->search_by_id( $uid);

    my $domain = $self->search_domain_by_id($id_domain);

    die "Unknown domain id '$id_domain'\n" if !$domain;

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    $domain->_vm->disconnect();
    $self->_disconnect_vm();
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    $domain->remove_base($user);

}


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sub _cmd_hybernate {
    my $self = shift;
    my $request = shift;

    my $uid = $request->args('uid') or confess "Missing argument uid";
    my $id_domain = $request->id_domain or confess "Missing request id_domain";

    my $user = Ravada::Auth::SQL->search_by_id( $uid);
    my $domain = $self->search_domain_by_id($id_domain);

    die "Unknown domain id '$id_domain'\n" if !$domain;

    $domain->hybernate($user);

}

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sub _cmd_download {
    my $self = shift;
    my $request = shift;

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    my $id_iso = $request->args('id_iso')
        or confess "Missing argument id_iso";

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    my $vm;
    $vm = Ravada::VM->open($request->args('id_vm')) if $request->defined_arg('id_vm');
    $vm = $self->search_vm('KVM')   if !$vm;
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    my $delay = $request->defined_arg('delay');
    sleep $delay if $delay;
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    my $iso = $vm->_search_iso($id_iso);
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    if ($iso->{device} && -e $iso->{device}) {
        $request->status('done',"$iso->{device} already downloaded");
        return;
    }
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