#!/usr/local/bin/perl -w
#######################################################################
# Roll Apache Logs
#######################################################################


use Time::localtime;
use Logfile::Rotate;
use File::Basename;


$DEBUG           = 0;

$APACHE_PID_FILE = '/var/run/httpd.pid';
$APACHE_CONF_DIR = '/usr/local/etc/apache24';
$VHOST_CONF_DIR  = '/usr/local/etc/apache24/vhosts';
$EXCLUDE_FILE    = "$APACHE_CONF_DIR/logroll_exclude.conf";

%Logs            = ();
$log_count       = 0;

$aday	         = 23 * 60 * 60;  # a day's worth of seconds
$rSecs           = time - $aday;
$rDate           = localtime($rSecs);
$logdate         = sprintf('%4d%02d%02d', 
	$rDate->year+1900, $rDate->mon+1,  $rDate->mday);


#### Grep the list of log files out of the vhost configs ##############
$log_grep = 'grep -Rhi CustomLog\\\\\\|ErrorLog ' . $VHOST_CONF_DIR;
open(LOGS,  "$log_grep |") 
	|| die("ERROR: Could not get log list: $!\n");

while (<LOGS> ) {
	chomp;
	if ( m/^\s*(Custom|Error)Log\s+(\S+).*$/i ) {
		$Logs{$2} = 1;
		$log_count++;
	}
	else {
		print("ERROR: Bad Line: $_\n");
	}
}
close(LOGS);
#######################################################################


#### Exclude certain logs #############################################
if (-e $EXCLUDE_FILE) {
	open(EXCL,  "$EXCLUDE_FILE") 
		|| die("ERROR: Could not get exclude list: $!\n");
	while (<EXCL> ) {
		chomp;
		next if ( m/^\s*$/ );    # skip blank lines
		next if ( m/^\s*#$/ );   # skip comments
		if ( m/^\s*(\S+).*$/ ) {
			delete($Logs{$1});
		}
	}
	close(EXCL);
}
#######################################################################


# roll logs
foreach my $log ( keys(%Logs) ) {
	if ( $log =~ m/^(.+)\.(current|today)\.(.+)$/ ) {
		$newname = "$1.$logdate.$3";
	}
	else {
		$newname = "$log.$logdate";
	}
	
	if (-e $log) {
		if (! -e $newname) {
			$log_base = basename($log);
			$new_base = basename($newname);
			print("Rolling $log_base -> $new_base\n") if ($DEBUG);
			my $log = new Logfile::Rotate(
				File    => $log, 
				Count   => 1,
				Gzip    => 'no', 
				Post    =>  \&BetterName, 
				Flock   => 'yes',
				Persist => 'yes'
			);
			$log->rotate();
			undef $log;
		}
		else {
			print STDERR ("Could not rotate $log, file $newname in the way.\n");
		}
	}
	else {
		print STDERR ("$log not found, skipping.\n");
	}

}
# Send 'kill' to apache
if ( -e $APACHE_PID_FILE ) {
	open(PID, $APACHE_PID_FILE);
	chomp($pid = <PID>);
	kill USR1 => $pid;
}
else {
	print STDERR ("Could not signal Apache.  Pid file $APACHE_PID_FILE not found");
}
#######################################################################




#######################################################################
#######################################################################

sub BetterName {
	my $old   = shift;
	my $new   = shift;
	
	rename($new, $main::newname);
	
	return 1;
}