#!/usr/bin/env perl
#
# Perl frontend to SquidAnalyzer.pm.
#
use strict;
use SquidAnalyzer;
use Getopt::Long qw(:config no_ignore_case bundling);
use Benchmark;
use POSIX ":sys_wait_h";

$| = 1;

my $DEFAULT_CONFFILE = '/etc/squidanalyzer/squidanalyzer.conf';

my @logfile    = ();
my $obsolete   = 0;
my $configfile = '';
my $help       = '';
my $rebuild    = '';
my $preserve   = '';
my $debug      = 0;
my $version    = 0;
my $build_date = '';
my $pid_dir    = '/tmp';
my $pidfile    = 'squid-analyzer.pid';
my $queue_size = 0;
my $timezone   = '';
my $no_year_stat = 0;
my $no_week_stat = 0;
my $t0 = Benchmark->new;

# get the command line parameters
my $result = GetOptions (
	"c|configfile=s"       => \$configfile,
	"b|build_date=s"       => \$build_date,
	"d|debug!"             => \$debug,
	"h|help"               => \$help,
	"j|jobs=i"             => \$queue_size,
	"l|logfile"            => \$obsolete,
	"p|preserve=i"         => \$preserve,
	"P|pid_dir=s"          => \$pid_dir,
	"r|rebuild!"           => \$rebuild,
	"t|timezone=s"         => \$timezone,
	"v|version!"           => \$version,
	"no-year-stat!"        => \$no_year_stat,
	"no-week-stat!"        => \$no_week_stat,
); 

# Show warning for obsolete options
if ($obsolete) {
	print STDERR "WARNING: use of obsolete -l option, log files must be given at command line arguments.\n"
}

# Show version and exit
if ($version || $debug) {
	print "SquidAnalyzer version $SquidAnalyzer::VERSION\n";
	exit 0 if ($version);
}

if ($build_date) {
	$rebuild = 1;
	if ( ($build_date !~ /^\d{4}-\d{2}-\d{2}$/) && ($build_date !~ /^\d{4}-\d{2}$/) && ($build_date !~ /^\d{4}$/) ) {
		die("FATAL: bad syntax for build_date, expecting format: yyyy-mm-dd, yyyy-mm or yyyy\n");
		exit 0;
	}
}

# Add multiple log files given from command line
foreach my $f (@ARGV) {
	push(@logfile, $f) if (-f $f && !-z $f);
}

# Set default configuration file
$configfile ||= $DEFAULT_CONFFILE;

if ($help) {
	&usage;
	exit;
}

# Check if an other process is already running
if (-e "$pid_dir/$pidfile") {
	die "FATAL: pid file ($pid_dir/$pidfile) exists, an other squid-analalyzer process may still running.\n";
}

# Write the pid file
open(OUT, ">$pid_dir/$pidfile") or die "FATAL: can not write to pid file $pid_dir/$pidfile, $!\n";
print OUT "$$";
close(OUT);

# Clear multiprocess temporary file if any
unlink("$pid_dir/last_parsed.tmp");

# Instanciate SquidAnalyzer.pm perl module
my $sa = new SquidAnalyzer($configfile, join(',', @logfile), $debug, $rebuild, $pid_dir, $pidfile, $timezone);
$sa->{no_year_stat} = $no_year_stat;
$sa->{no_week_stat} = $no_week_stat;
$sa->{queue_size} = $queue_size;

# Die cleanly on signal
sub terminate
{
        # block signal
        local $SIG{TERM} = 'IGNORE';
        local $SIG{INT}  = 'IGNORE';

        print("LOG: Received terminating signal.\n");

	$sa->{terminate} = 1;

	# Save last parse line
	$sa->save_current_line();

        # Wait for all child processes to die except for the logger
	my $kid = 0;
	do {
                sleep(1);
		$kid = waitpid(-1, WNOHANG);
	} while ($kid > 0);

	# Removed pid iand temp file
        if (-e "$pid_dir/$pidfile") {
                unlink("$pid_dir/$pidfile") or print("ERROR: Unable to remove pid file $pid_dir/$pidfile, $!\n");
	}
        if (-e "$pid_dir/last_parsed.tmp") {
                unlink("$pid_dir/last_parsed.tmp") or print("ERROR: Unable to remove temp file $pid_dir/last_parsed.tmp, $!\n");
        }

        exit 0;
}

# Handle signals to die cleanly
$SIG{'INT'} = \&terminate;
$SIG{'TERM'} = \&terminate;
$SIG{'CHLD'} = 'DEFAULT';

my $t1;
# Run parsing only if we have a log file or that we are not in rebuild mode
if (!$rebuild || ($#logfile >= 0)) {
	$sa->parseFile();
	if ($debug) {
		$t1 = Benchmark->new;
		my $td = timediff($t1, $t0);
		print STDERR "DEBUG: the log statistics gathering took:", timestr($td), "\n";
	}
}

# Remove old statistics
if ($preserve) {
	$sa->{preserve} = $preserve;
}

# In rebuild mode history time is not use and we must store the
# specific rebuild date if any is provided at command line.
if ($rebuild) {
	$sa->{history_time} = '';
	$sa->{build_date} = $build_date;
}

# Generate graphics and html
$sa->buildHTML();
if ($debug) {
	my $t2 = Benchmark->new;
	if (defined $t1) {
		my $td = timediff($t2, $t1);
		print STDERR "DEBUG: generating HTML output took:", timestr($td), "\n";
	}

	my $td = timediff($t2, $t0);
	print STDERR "DEBUG: total execution time:", timestr($td), "\n";
}

# Remove PID file
unlink("$pid_dir/$pidfile");

exit(0);


sub usage
{
	print qq{
Usage: squid-analyzer [ -c squidanalyzer.conf ] [logfile(s)]

    -c | --configfile filename : path to the SquidAnalyzer configuration file.
				 By default: $DEFAULT_CONFFILE
    -b | --build_date date     : set the date to be rebuilt, format: yyyy-mm-dd
				 or yyyy-mm or yyyy. Used with -r or --rebuild.
    -d | --debug               : show debug informations.
    -h | --help                : show this message and exit.
    -j | --jobs number         : number of jobs to run at same time. Default is 1,
                                 run as single process.
    -p | --preserve number     : used to set the statistic obsolescence in
				 number of month. Older stats will be removed.
    -P | --pid_dir directory   : set directory where pid file will be stored.
				 Default /tmp/
    -r | --rebuild             : use this option to rebuild all html and graphs
				 output from all data files.
    -t, --timezone +/-HH       : set number of hours from GMT of the timezone.
                                 Use this to adjust date/time of SquidAnalyzer
                                 output when it is run on a different timezone
                                 than the squid server.
    -v | version               : show version and exit.
    --no-year-stat             : disable years statistics, reports will start
                                 from month level only.
    --no-week-stat             : disable weekly statistics.

Log files to parse can be given as command line arguments or as a comma separated
list of file for the LogFile configuration directive. By default SquidAnalyer will
use file: /var/log/squid/access.log

};

	exit 0;
}