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package SL::System::TaskServer;
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use strict;
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use parent qw(Rose::Object);
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use Rose::Object::MakeMethods::Generic (
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scalar => [ qw(last_command_output) ],
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);
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use File::Slurp;
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use File::Spec::Functions qw(:ALL);
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use SL::System::Process;
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use constant {
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OK => 0,
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ERR_PID_FILE => -1,
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ERR_PROCESS => -2,
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};
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sub status {
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my ($self) = @_;
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my $pid = $self->_read_pid;
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return ERR_PID_FILE unless $pid;
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return kill(0, $pid) ? OK : ERR_PROCESS;
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}
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sub is_running {
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my ($self) = @_;
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return $self->status == OK;
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}
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sub start {
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my ($self) = @_;
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return $self->_run_script_command('start');
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}
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sub stop {
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my ($self) = @_;
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return $self->_run_script_command('stop');
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}
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sub wake_up {
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my ($self) = @_;
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my $pid = $self->_read_pid;
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return undef unless $pid;
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return kill('ALRM', $pid) ? 1 : undef;
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}
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#
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# private methods
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#
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sub _read_pid {
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my ($self) = @_;
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my $exe_dir = SL::System::Process->exe_dir;
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my $pid_file_name = join '.', splitdir($exe_dir), 'config.lx_office.conf.pid';
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my $pid_file_path = catfile(catdir($exe_dir, 'users', 'pid'), $pid_file_name);
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return undef unless -f $pid_file_path;
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return join('', read_file($pid_file_path)) * 1;
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}
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sub _run_script_command {
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my ($self, $command) = @_;
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my $exe = catfile(catdir(SL::System::Process->exe_dir, 'scripts'), 'task_server.pl');
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$self->last_command_output(`${exe} ${command}`);
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return $? == 0 ? 1 : undef;
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}
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1;
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__END__
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=pod
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=encoding utf8
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=head1 NAME
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SL::System::TaskServer - programmatic interface to the external task server component
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=head1 SYNOPSIS
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# Create interface
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my $task_server = SL->TaskServer->new;
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# Start the server if it is not running
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if (!$task_server->is_running) {
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$task_server->start;
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}
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# Stop it if it is running
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if ($task_server->is_running) {
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$task_server->stop;
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}
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=head1 FUNCTIONS
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=over 4
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=item C<is_running>
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Returns C<trueish> if the server is running. This is done by using
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Perl's C<kill> function with a "signal" of C<0> for the process ID
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which in turn is read from the daemon's PID file.
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If the PID file is not found or if C<kill> returns a non-successful
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value then a C<falsish> value is returned.
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=item C<last_command_output>
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Returns the output of the last C<system> command executed, e.g. from a
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call to L<start> or L<stop>.
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=item C<start>
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Starts the task server. Does not check whether or not it is running,
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neither before not after trying to start it.
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Returns C<1> if the system command C<./scripts/task_server.pl start>
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exits with an exit code of C<0> and C<undef> otherwise.
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The command's output can be queried with L<last_command_output>.
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=item C<status>
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Queries the task server status. Returns one of these values:
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=over 4
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=item *
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C<OK> or C<0>: the task server is running and signals can be sent to
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it.
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=item *
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C<ERR_PID_FILE> or C<-1>: the PID file could not be found or read
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=item *
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C<ERR_PROCESS> or C<-2>: the PID file could was found and read, but
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it's not possible to send signals to the process, e.g. because it is
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not running or owned by a different user ID.
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=back
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=item C<stop>
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Stops the task server. Does not check whether or not it is running,
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neither before not after trying to start it.
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Returns C<1> if the system command C<./scripts/task_server.pl stop>
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exits with an exit code of C<0> and C<undef> otherwise.
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The command's output can be queried with L<last_command_output>.
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=item C<wake_up>
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Sends a signal to the task server process causing it to wake up and
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process its job queue immediately.
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Returns C<1> if the signal could be sent and C<undef> otherwise.
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=back
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=head1 BUGS
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Nothing here yet.
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=head1 AUTHOR
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Moritz Bunkus E<lt>m.bunkus@linet-services.deE<gt>
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=cut
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