package MooseX::Daemonize;
use strict; # because Kwalitee is pedantic
use Moose::Role;
+use MooseX::Types::Path::Class;
-our $VERSION = 0.01;
-use Carp;
-use Proc::Daemon;
+our $VERSION = 0.05;
-use File::Flock;
-use File::Slurp;
-
-with qw(MooseX::Getopt);
+with 'MooseX::Daemonize::WithPidFile',
+ 'MooseX::Getopt';
has progname => (
- isa => 'Str',
- is => 'ro',
- lazy => 1,
- required => 1,
- default => sub {
+ metaclass => 'Getopt',
+ isa => 'Str',
+ is => 'ro',
+ lazy => 1,
+ required => 1,
+ default => sub {
( my $name = lc $_[0]->meta->name ) =~ s/::/_/g;
return $name;
},
);
has pidbase => (
- isa => 'Str',
- is => 'ro',
-
- # required => 1,
- lazy => 1,
- default => sub { return '/var/run' },
+ metaclass => 'Getopt',
+ isa => 'Path::Class::Dir',
+ is => 'ro',
+ coerce => 1,
+ required => 1,
+ lazy => 1,
+ default => sub { Path::Class::Dir->new('var', 'run') },
);
-has pidfile => (
- isa => 'Str',
- is => 'ro',
- lazy => 1,
- required => 1,
- default => sub {
- die 'Cannot write to ' . $_[0]->pidbase unless -w $_[0]->pidbase;
- $_[0]->pidbase . '/' . $_[0]->progname . '.pid';
- },
+has basedir => (
+ metaclass => 'Getopt',
+ isa => 'Path::Class::Dir',
+ is => 'ro',
+ coerce => 1,
+ required => 1,
+ lazy => 1,
+ default => sub { Path::Class::Dir->new('/') },
);
has foreground => (
metaclass => 'Getopt',
- cmd_aliases => ['f'],
+ cmd_aliases => 'f',
isa => 'Bool',
is => 'ro',
default => sub { 0 },
);
-sub check {
- my ($self) = @_;
- if ( my $pid = $self->get_pid ) {
- my $prog = $self->progname;
- if ( CORE::kill 0 => $pid ) {
- croak "$prog already running ($pid).";
- }
- carp "$prog not running but found pid ($pid)."
- . "Perhaps the pid file (@{ [$self->pidfile] }) is stale?";
- return 1;
- }
- return 0;
+has stop_timeout => (
+ metaclass => 'Getopt',
+ isa => 'Int',
+ is => 'rw',
+ default => sub { 2 }
+);
+
+# methods ...
+
+## PID file related stuff ...
+
+sub init_pidfile {
+ my $self = shift;
+ my $file = $self->pidbase . '/' . $self->progname . '.pid';
+ confess "Cannot write to $file" unless (-e $file ? -w $file : -w $self->pidbase);
+ MooseX::Daemonize::Pid::File->new( file => $file );
}
-sub daemonize {
- my ($self) = @_;
- Proc::Daemon::Init;
+# backwards compat,
+sub check { (shift)->pidfile->is_running }
+sub save_pid { (shift)->pidfile->write }
+sub remove_pid { (shift)->pidfile->remove }
+sub get_pid { (shift)->pidfile->pid }
+
+## signal handling ...
+
+sub setup_signals {
+ my $self = shift;
+ $SIG{'INT'} = sub { $self->handle_sigint };
+ $SIG{'HUP'} = sub { $self->handle_sighup };
}
+sub handle_sigint { $_[0]->stop; }
+sub handle_sighup { $_[0]->restart; }
+
+## daemon control methods ...
+
sub start {
my ($self) = @_;
- return if $self->check;
-
+
+ confess "instance already running" if $self->pidfile->is_running;
+
$self->daemonize unless $self->foreground;
-
- # Avoid 'stdin reopened for output' warning with newer perls
- ## no critic
- open( NULL, '/dev/null' );
- <NULL> if (0);
- ## use critic
- $self->save_pid;
+ return unless $self->is_daemon;
+
+ $self->pidfile->pid($$);
+
+ # Change to basedir
+ chdir $self->basedir;
+
+ $self->pidfile->write;
$self->setup_signals;
return $$;
}
-sub save_pid {
- my ($self) = @_;
- my $pidfile = $self->pidfile;
- lock( $pidfile, undef, 'nonblocking' )
- or croak "Could not lock PID file $pidfile: $!";
- write_file( $pidfile, "$$\n" );
- unlock($pidfile);
- return;
-}
-
-sub remove_pid {
+sub restart {
my ($self) = @_;
- my $pidfile = $self->pidfile;
- lock( $pidfile, undef, 'nonblocking' )
- or croak "Could not lock PID file $pidfile: $!";
- unlink($pidfile);
- unlock($pidfile);
- return;
+ $self->stop( no_exit => 1 );
+ $self->start();
}
-sub get_pid {
- my ($self) = @_;
- my $pidfile = $self->pidfile;
- return unless -e $pidfile;
- chomp( my $pid = read_file($pidfile) );
- return $pid;
-}
+# Make _kill *really* private
+my $_kill;
sub stop {
my ( $self, %args ) = @_;
- my $pid = $self->get_pid;
- $self->kill($pid) unless $self->foreground();
- $self->remove_pid;
+ my $pid = $self->pidfile->pid;
+ $self->$_kill($pid) unless $self->foreground();
+ $self->pidfile->remove;
return 1 if $args{no_exit};
exit;
}
-sub restart {
- my ($self) = @_;
- $self->stop( noexit => 1 );
- $self->start();
-}
-
-sub setup_signals {
- my ($self) = @_;
- $SIG{INT} = sub { $self->handle_sigint; };
- $SIG{HUP} = sub { $self->handle_sighup };
-}
-
-sub handle_sigint { $_[0]->stop; }
-sub handle_sighup { $_[0]->restart; }
-
-sub kill {
+$_kill = sub {
my ( $self, $pid ) = @_;
return unless $pid;
unless ( CORE::kill 0 => $pid ) {
if ( $pid eq $$ ) {
- # warn "$pid is us! Can't commit suicied.";
+ # warn "$pid is us! Can't commit suicide.";
return;
}
- CORE::kill( 2, $pid ); # Try SIGINT
- sleep(2) if CORE::kill( 0, $pid );
-
- unless ( CORE::kill 0 => $pid or $!{EPERM} ) { # IF it is still running
- CORE::kill( 15, $pid ); # try SIGTERM
- sleep(2) if CORE::kill( 0, $pid );
- }
-
- unless ( CORE::kill 0 => $pid or $!{EPERM} ) { # IF it is still running
- CORE::kill( 9, $pid ); # finally try SIGKILL
- sleep(2) if CORE::kill( 0, $pid );
+ my $timeout = $self->stop_timeout;
+
+ # kill 0 => $pid returns 0 if the process is dead
+ # $!{EPERM} could also be true if we cant kill it (permission error)
+
+ # Try SIGINT ... 2s ... SIGTERM ... 2s ... SIGKILL ... 3s ... UNDEAD!
+ for ( [ 2, $timeout ], [15, $timeout], [9, $timeout * 1.5] ) {
+ my ($signal, $timeout) = @$_;
+ $timeout = int $timeout;
+
+ CORE::kill($signal, $pid);
+
+ last unless CORE::kill 0 => $pid or $!{EPERM};
+
+ while ($timeout) {
+ sleep(1);
+ last unless CORE::kill 0 => $pid or $!{EPERM};
+ $timeout--;
+ }
}
- unless ( CORE::kill 0 => $pid or $!{EPERM} ) { # IF it is still running
- carp "$pid doesn't seem to want to die."; # AHH EVIL DEAD!
- }
+ return unless ( CORE::kill 0 => $pid or $!{EPERM} );
- return;
-}
+ # IF it is still running
+ Carp::carp "$pid doesn't seem to want to die."; # AHH EVIL DEAD!
+};
1;
__END__
-=head1 NAME
+=pod
-MooseX::Daemonize - provides a Role that daemonizes your Moose based application.
+=head1 NAME
+MooseX::Daemonize - provides a Role that daemonizes your Moose based
+application.
=head1 VERSION
-This document describes MooseX::Daemonize version 0.0.1
-
+This document describes MooseX::Daemonize version 0.05
=head1 SYNOPSIS
- package FileMaker;
+ package My::Daemon;
use Moose;
+
with qw(MooseX::Daemonize);
+
+ # ... define your class ....
+
+ after start => sub {
+ my $self = shift;
+ return unless $self->is_daemon;
+ # your daemon code here ...
+ };
- sub create_file {
- my ( $self, $file ) = @_;
- open( FILE, ">$file" ) || die;
- close(FILE);
- }
-
- no Moose;
-
- # then in the main package ...
+ # then in your script ...
+
+ my $daemon = My::Daemon->new_with_options();
+
+ my ($command) = @{$daemon->extra_argv}
+ defined $command || die "No command specified";
- my $daemon = FileMaker->new();
- $daemon->start();
- $daemon->create_file($file);
- $daemon->stop();
+ $daemon->start() if $command eq 'start';
+ $daemon->stop() if $command eq 'stop';
=head1 DESCRIPTION
-Often you want to write a persistant daemon that has a pid file, and responds appropriately to Signals.
-This module helps provide the basic infrastructure to do that.
+Often you want to write a persistant daemon that has a pid file, and responds
+appropriately to Signals. This module provides a set of basic roles as an
+infrastructure to do that.
=head1 ATTRIBUTES
+This list includes attributes brought in from other roles as well
+we include them here for ease of documentation. All of these attributes
+are settable though L<MooseX::Getopt>'s command line handling, with the
+exception of C<is_daemon>.
+
=over
-=item progname Str
+=item I<progname Path::Class::Dir | Str>
+
+The name of our daemon, defaults to C<$package_name =~ s/::/_/>;
+
+=item I<pidbase Path::Class::Dir | Str>
-The name of our daemon, defaults to $0
+The base for our bid, defaults to C</var/run/$progname>
-=item pidbase Str
+=item I<pidfile MooseX::Daemonize::Pid::File | Str>
-The base for our bid, defaults to /var/run/$progname
+The file we store our PID in, defaults to C</var/run/$progname>
-=item pidfile Str
+=item I<foreground Bool>
-The file we store our PID in, defaults to /var/run/$progname/
+If true, the process won't background. Useful for debugging. This option can
+be set via Getopt's -f.
-=item foreground Bool
+=item I<is_daemon Bool>
-If true, the process won't background. Useful for debugging. This option can be set via Getopt's -f.
+If true, the process is the backgrounded daemon process, if false it is the
+parent process. This is useful for example in an C<after 'start' => sub { }>
+block.
+
+B<NOTE:> This option is explicitly B<not> available through L<MooseX::Getopt>.
+
+=item I<stop_timeout>
+
+Number of seconds to wait for the process to stop, before trying harder to kill
+it. Defaults to 2 seconds.
=back
=head1 METHODS
-=over
+=head2 Daemon Control Methods
+
+These methods can be used to control the daemon behavior. Every effort
+has been made to have these methods DWIM (Do What I Mean), so that you
+can focus on just writing the code for your daemon.
-=item check()
+Extending these methods is best done with the L<Moose> method modifiers,
+such as C<before>, C<after> and C<around>.
-Check to see if an instance is already running.
+=over 4
-=item start()
+=item B<start>
Setup a pidfile, fork, then setup the signal handlers.
-=item stop()
+=item B<stop>
Stop the process matching the pidfile, and unlinks the pidfile.
-=item restart()
+=item B<restart>
-Litterally
+Literally this is:
$self->stop();
$self->start();
-=item daemonize()
+=back
-Calls C<Proc::Daemon::Init> to daemonize this process.
+=head2 Pidfile Handling Methods
-=item kill($pid)
+=over 4
-Kills the process for $pid. This will try SIGINT, and SIGTERM before falling back to SIGKILL and finally giving up.
+=item B<init_pidfile>
-=item setup_signals()
+This method will create a L<MooseX::Daemonize::Pid::File> object and tell
+it to store the PID in the file C<$pidbase/$progname.pid>.
-Setup the signal handlers, by default it only sets up handlers for SIGINT and SIGHUP
+=item B<check>
-=item handle_sigint()
+This checks to see if the daemon process is currently running by checking
+the pidfile.
-Handle a INT signal, by default calls C<$self->stop()>;
+=item B<get_pid>
-=item handle_sighup()
+Returns the PID of the daemon process.
-Handle a HUP signal. Nothing is done by default.
+=item B<save_pid>
-=item get_pid
+Write the pidfile.
-=item save_pid
+=item B<remove_pid>
-=item remove_pid
+Removes the pidfile.
-=item meta()
+=back
+
+=head2 Signal Handling Methods
+
+=over 4
+
+=item B<setup_signals>
-the C<meta()> method from L<Class::MOP::Class>
+Setup the signal handlers, by default it only sets up handlers for SIGINT and
+SIGHUP. If you wish to add more signals just use the C<after> method modifier
+and add them.
+
+=item B<handle_sigint>
+
+Handle a INT signal, by default calls C<$self->stop()>
+
+=item B<handle_sighup>
+
+Handle a HUP signal. By default calls C<$self->restart()>
=back
-=head1 DEPENDENCIES
+=head2 Introspection
-=for author to fill in:
- A list of all the other modules that this module relies upon,
- including any restrictions on versions, and an indication whether
- the module is part of the standard Perl distribution, part of the
- module's distribution, or must be installed separately. ]
+=over 4
-Obviously L<Moose>, also L<Carp>, L<Proc::Daemon>, L<File::Flock>, L<File::Slurp>
+=item meta()
-=head1 INCOMPATIBILITIES
+The C<meta()> method from L<Class::MOP::Class>
-=for author to fill in:
- A list of any modules that this module cannot be used in conjunction
- with. This may be due to name conflicts in the interface, or
- competition for system or program resources, or due to internal
- limitations of Perl (for example, many modules that use source code
- filters are mutually incompatible).
+=back
-None reported.
+=head1 DEPENDENCIES
+L<Moose>, L<MooseX::Getopt>, L<MooseX::Types::Path::Class> and L<POSIX>
-=head1 BUGS AND LIMITATIONS
+=head1 INCOMPATIBILITIES
-=for author to fill in:
- A list of known problems with the module, together with some
- indication Whether they are likely to be fixed in an upcoming
- release. Also a list of restrictions on the features the module
- does provide: data types that cannot be handled, performance issues
- and the circumstances in which they may arise, practical
- limitations on the size of data sets, special cases that are not
- (yet) handled, etc.
+None reported. Although obviously this will not work on Windows.
+
+=head1 BUGS AND LIMITATIONS
No bugs have been reported.
=head1 SEE ALSO
-L<Proc::Daemon>, L<Daemon::Generic>, L<MooseX::Getopt>
+L<Proc::Daemon>, L<Daemon::Generic>
=head1 AUTHOR
Chris Prather C<< <perigrin@cpan.org> >>
+=head1 THANKS
+
+Mike Boyko, Matt S. Trout, Stevan Little, Brandon Black, Ash Berlin and the
+#moose denzians
+
+Some bug fixes sponsored by Takkle Inc.
=head1 LICENCE AND COPYRIGHT
-Copyright (c) 2007, Chris Prather C<< <perigrin@cpan.org> >>. All rights reserved.
+Copyright (c) 2007, Chris Prather C<< <perigrin@cpan.org> >>. All rights
+reserved.
This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself. See L<perlartistic>.
-
=head1 DISCLAIMER OF WARRANTY
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
+
+=cut