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#!/usr/bin/perl |
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#* |
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#* Name: PidFile |
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#* Info: simple read / write pidfile |
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#* Author: Lukasz Romanowski (roman) <lroman@cpan.org> |
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#* |
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use MooseX::Declare; # MooseX classes |
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use strict; |
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use warnings; |
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class PidFile { |
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# --- version --- |
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our $VERSION = '1.04'; |
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#=------------------------------------------------------------------------( use, constants ) |
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# --- CPAN --- |
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use Carp; # confess |
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use FindBin; # script name |
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use File::Slurp; # read_file() / write_file() |
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use File::Basename; # basename() |
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use MooseX::ClassAttribute; # class attributes |
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#=------------------------------------------------------------------------( class attributes ) |
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class_has 'Dir' => ( is => 'rw', isa => 'Str', default => q{/var/run} ); # pid file dir |
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class_has 'Suffix' => ( is => 'rw', isa => 'Str', default => q{} ); # pid file suffix |
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#=------------------------------------------------------------------------( class methods ) |
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# start every class function with Capital letter |
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# default pidfile is /var/run/$PROGRAM_NAME.pid |
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# default pid is $PID ($$) |
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#=------- |
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# Path |
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#=------- |
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#* get path to pid file |
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#* return path to pid file |
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method Path( $class: Str :name( $p_name ) = $FindBin::Script ) { |
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return $class->Dir . '/' . basename( $p_name ) . ( $class->Suffix && '_'.$class->Suffix ) . '.pid'; |
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} |
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#=------- |
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# Read |
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#=------- |
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#* read pid from pid file |
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#* return pid from pidfile or undef if pidfile not exists |
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method Read( $class: Str :name( $p_name ) = $FindBin::Script ) { |
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my $file = $class->Path( 'name' => $p_name ); |
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if ( not -f $file ) { |
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carp "missing pid file: $file"; |
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return; |
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} |
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my $pid = read_file( $file ); |
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chomp $pid; |
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return $pid; |
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} |
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#=-------- |
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# Write |
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#=-------- |
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#* write pid to pid file |
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#* return 1 upon successfully writing the file or undef if it encountered an error |
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method Write( $class: Int :pid( $p_pid ) = $$, :name( $p_name ) = $FindBin::Script ) { |
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my $file = $class->Path( 'name' => $p_name ); |
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if ( -f $file ) { |
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carp "find old pid file: $file"; |
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my $old_pid = $class->Read( 'name' => $p_name ); |
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return 1 if $old_pid == $p_pid; |
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confess "old process (pid: $old_pid) arleady running!" if $class->Check( 'pid' => $old_pid ); |
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# or |
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$class->Delete( 'name' => $p_name ); |
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} |
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return write_file( $file, $p_pid ); |
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} |
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#=--------- |
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# Delete |
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#=--------- |
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#* delete pid file |
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#* return 1 if file successfully deleted, else 0 |
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method Delete( $class: Str :name( $p_name ) = $FindBin::Script ) { |
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return unlink $class->Path( 'name' => $p_name ); |
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} |
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#=-------- |
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# Check |
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#=-------- |
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#* check if process running |
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#* return pid if proces exists, undef if error, else 0 |
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method Check( $class: Int :pid( $p_pid ) = $$, Str :name( $p_name ) = q{} ) { |
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my $pid = $p_name ? $class->Read( 'name' => $p_name ) : $p_pid; |
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return undef if not $pid; |
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return +( kill 0, $pid ) ? $pid : 0; |
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} |
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} |
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__END__ |
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=pod |
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=head1 NAME |
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PidFile - simple read / write pidfile |
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=head1 SYNOPSIS |
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use PidFile; |
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# read pidfile |
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my $pid = PidFile->Read; |
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if ( $pid ) { |
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# pid file for this script arealdy exists |
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# check if script running |
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if ( PidFile->Check( "pid" => $pid ) { |
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# script running, so i die |
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confess; |
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} |
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# script not running, delete old pidfile |
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PidFile->Delete; |
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} |
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# save new pid file |
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PidFile->Write; |
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## or you can run just only |
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PidFile->Write; |
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## and this function check if old pidfile exists and if script running |
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=head1 DESCRIPTION |
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PidFile provide very simple class methods to manages a pidfile for the current or any process. |
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=head1 CLASS METHODS |
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=over 2 |
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=item B<Path> |
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get path to pid file |
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input (hash): |
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C<name> => (str) script name [ default: C<$FindBin::Script> ] |
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164
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return: path to pid file |
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=item B<Read> |
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168
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read pid from pid file |
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input (hash): |
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C<name> => (str) script name [ default: C<$FindBin::Script> ] |
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return: pid from pidfile or undef if pidfile not exists |
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=item B<Write> |
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write pid to pid file |
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input (hash): |
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C<pid> => (int) process id [ default: C<$$> ] |
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C<name> => (str) script name [ default: C<$FindBin::Script> ] |
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return: 1 upon successfully writing the file or undef if it encountered an error |
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188
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=item B<Delete> |
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delete pid file |
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input (hash): |
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C<name> => (str) script name [ default: C<$FindBin::Script> ] |
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return: 1 if file successfully deleted, else 0 |
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=item B<Check> |
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check if process running |
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input (hash): |
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C<pid> => (int) process id [ default: C<$$> ] |
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C<name> => (str) script name [ optional ] |
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return: pid if proces exists, undef if error, else 0 |
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=back |
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=head1 CLASS ATTRIBUTES |
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=over 2 |
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=item B<Dir> |
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set / get pid file dir |
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default: /var/run |
221
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222
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=item B<Suffix> |
223
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224
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set / get pidfile suffix |
225
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226
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default: empty sting |
227
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228
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=back |
229
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230
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=head1 AUTHOR |
231
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232
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Lukasz Romanowski (roman) <lroman@cpan.org> |
233
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234
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=head1 LICENSE |
235
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236
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This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. |
237
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238
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=cut |
239
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