#!@PERL@
#  Copyright (C) 2002  Stanislav Sinyagin
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

# $Id: collector.in,v 1.1 2010-12-27 00:04:03 ivan Exp $
# Stanislav Sinyagin <ssinyagin@yahoo.com>

BEGIN { require '@torrus_config_pl@'; }

use strict;
use Proc::Daemon;
use Getopt::Long;

use Torrus::Log;
use Torrus::ConfigTree;
use Torrus::Collector;
use Torrus::SiteConfig;

$| = 1;

exit(1) if not Torrus::SiteConfig::verify();

my $tree;
my $instance;
my $nodaemon;
my $runonce;
my $runalways;
my $debug;
my $verbose;
my $help_needed;

# Derive the process name from the command line
my $process_name = $0;
$process_name =~ s/^.*\/([^\/]+)$/$1/;
$process_name .= ' ' . join(' ', @ARGV);
                            
my $ok = GetOptions ('tree=s'     => \$tree,
                     'instance=i' => \$instance,
                     'nodaemon'   => \$nodaemon,
                     'runonce'    => \$runonce,
                     'runalways'  => \$runalways,
                     'debug'      => \$debug,
                     'verbose'    => \$verbose,
                     'help'       => \$help_needed);

if( not $ok or not $tree or $help_needed or scalar(@ARGV) > 0 )
{
    print STDERR "Usage: $0 --tree=NAME [options...]\n",
    "Options:\n",
    "  --tree=NAME     tree name\n",
    "  --instance=N    instance number for multiple collectors per tree\n",
    "  --nodaemon      do not fork daemon and log to STDERR\n",
    "  --runonce       run one time and exit. Implies --nodaemon\n",
    "  --runalways     continue running if no collectors defined\n",
    "  --debug         set the log level to debug\n",
    "  --verbose       set the log level to info\n",
    "  --help          this help message\n";
    exit 1;
}

if( not Torrus::SiteConfig::mayRunCollector( $tree ) )
{
    Error('Tree ' . $tree . ' is not configured to run collector');
    exit 1;
}

my $nInstances = Torrus::SiteConfig::collectorInstances( $tree );

if( $nInstances > 1 and not defined( $instance ) )
{
    Error('--instance option is missing');
    exit 1;
}

if( not defined( $instance ) )
{
    $instance = 0;
}

if( $instance >= $nInstances )
{
    Error('Invalid instance number. Allowed from 0 to ' . ($nInstances-1));
    exit 1;
}

if( $debug )
{
    Torrus::Log::setLevel('debug');
}
elsif( $verbose )
{
    Torrus::Log::setLevel('verbose');
}

my $logfile =
    $Torrus::Global::logDir . '/collector.' . $tree . '_' . $instance . '.log';
my $pidfile;

my $rotateLogs = sub
{
    Info('Caught SIGHUP. Reopening log file');
    close( STDERR );
    open( STDERR, ">>$logfile" );
    $| = 1;
};

if( not $nodaemon and not $runonce )
{
    my $pidfilename = 
        $Torrus::Global::pidDir . '/collector.' .
        $tree . '_' . $instance . '.pid';
    
    if( -r $pidfilename )
    {
        Error("Another collector daemon is running, pid=",
              `cat $pidfilename`);
        exit 1;
    }

    &Proc::Daemon::Init();
    umask 0017; # Proc::Daemon::Init sets the mask to all-writable
    
    $SIG{'HUP'} = $rotateLogs;

    # At this point, we cannot tell anyone if "open" fails
    open(STDERR, ">>$logfile");

    $pidfile = $pidfilename;
    
    if( open( PID, ">$pidfile" ) )
    {
        printf PID ( "%d", $$ );
        close PID;
    }
    else
    {
        Error("Cannot open $pidfile for writing: $!");
    }
}


Torrus::Collector::initThreads();

&Torrus::DB::setSafeSignalHandlers();


Info(sprintf("Torrus version %s", '@VERSION@'));
Info(sprintf("%s started for tree %s, instance #%d", $0, $tree, $instance));
Debug(sprintf("Process ID %d", $$));

my %options =
    (
     '-ProcessName' => $process_name,
     '-Tree'        => $tree,
     '-Instance'    => $instance
     );

if( $runonce )
{
    $options{'-RunOnce'} = 1;
}
if( $runalways )
{
    $options{'-RunAlways'} = 1;
}


my $scheduler = new Torrus::CollectorScheduler( %options );
$scheduler->run();

if( not $options{'-RunOnce'} )
{
    Error("Collector process exited: nothing to collect");
    unlink $pidfile;
}

exit;


END
{
    if( defined($pidfile) and -r $pidfile )
    {
        unlink $pidfile;
    }
}

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