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|
#!/usr/bin/perl
# Minimal PerlDaemon (c) 2011 Paul Buetow
use strict;
use warnings;
use Shell qw(mv);
use POSIX qw(setsid strftime);
use PerlDaemon::Logger;
use PerlDaemon::RunModules;
$| = 1;
sub trimstr (@) {
my @str =
@_;
for (@str) {
chomp;
s/^[\t\s]+//;
s/[\t\s]+$//;
}
return @str;
}
sub trunc ($) {
my $file = shift;
open my $fh, ">$file" or die "Can't write $file: $!\n";
print $fh '';
close $fh;
}
sub checkpid ($) {
my $conf = shift;
my $pidfile = $conf->{'daemon.pidfile'};
my $logger = $conf->{logger};
trunc $pidfile unless -f $pidfile;
open my $fh, $pidfile or $logger->err("Can't read pidfile $pidfile: $!");
my ($pid) = <$fh>;
close $fh;
if (defined $pid) {
chomp $pid;
$logger->err("Process with pid $pid already running") if 0 < int $pid && kill 0, $pid;
}
}
sub writepid ($) {
my $conf = shift;
my $logger = $conf->{logger};
my $pidfile = $conf->{'daemon.pidfile'};
open my $fh, ">$pidfile" or $logger->err("Can't write pidfile: $!");
print $fh "$$\n";
close $fh;
}
sub readconf ($%) {
my ($confile, %opts) = @_;
open my $fh, $confile or
die "Can't read config file $confile (specify using config=filepath)\n";
my %conf;
while (<$fh>) {
next if /^[\t\w]+#/;
s/#.*//;
my ($key, $val) = trimstr split '=', $_, 2;
next unless defined $val;
$conf{$key} = $val;
}
close $fh;
# Check
my $msg = 'Missing property:';
foreach (qw(wd loopinterval alivefile pidfile logfile daemonize)) {
my $key = "daemon.$_";
die "$msg $key\n" unless exists $conf{$key};
}
@conf{keys %opts} = values %opts;
return \%conf;
}
sub daemonize ($) {
my $conf = shift;
my $logger = $conf->{logger};
$logger->logmsg('Daemonizing...');
chdir $conf->{'daemon.wd'} or $logger->err("Can't chdir to wd: $!");
my $msg = 'Can\'t read /dev/null:';
open STDIN, '>/dev/null' or $logger->err("$msg $!");
open STDOUT, '>/dev/null' or $logger->err("$msg $!");
open STDERR, '>/dev/null' or $logger->err("$msg $!");
defined (my $pid = fork) or $logger->err("Can't fork: $!");
exit if $pid;
setsid or $logger->err("Can't start a new session: $!");
writepid $conf;
$logger->logmsg('Daemonizing completed');
}
sub sighandlers ($) {
my $conf = shift;
my $logger = $conf->{logger};
$SIG{TERM} = sub {
# On shutdown
$logger->logmsg('Received SIGTERM. Shutting down....');
unlink $conf->{'daemon.pidfile'} if -f $conf->{'daemon.pidfile'};
exit 0;
};
$SIG{HUP} = sub {
# On logrotate
$logger->logmsg('Received SIGHUP.');
$logger->rotatelog();
};
}
sub prestartup ($) {
my $conf = shift;
checkpid $conf;
}
sub alive ($) {
my $conf = shift;
}
sub daemonloop ($) {
my $conf = shift;
my $rmodule = PerlDaemon::RunModules->new($conf);
my $loopinterval = $conf->{'daemon.loopinterval'};
my $loop = shift;
for (my $i = 1;;++$i) {
$rmodule->do();
sleep $loopinterval;
alive $conf;
}
}
sub getopts (@) {
my %opts;
for my $opt (@_) {
next unless $opt =~ /=/;
my ($key, $val) = split '=', $opt, 2;
$opts{$key} = $val;
}
return %opts;
}
my %opts = getopts @ARGV;
my $conf = readconf $opts{config}, %opts;
$conf->{logger} = PerlDaemon::Logger->new($conf);
prestartup $conf;
if ($conf->{'daemon.daemonize'} ne 'yes') {
print "Running in foreground...\n";
} else {
daemonize $conf;
}
sighandlers $conf;
daemonloop $conf;
|
