#!/usr/bin/perl
# 
# This daemon monitors and logs preformance data. This is meant to help debug issues related to (potential)
# performance issues.
# 
# NOTE: This is designed to be minimal overhead, so there is no attempt to connect to the database. As such, 
#       be mindful of what this daemon is used for.
# 

use strict;
use warnings;
use Data::Dumper;
use Anvil::Tools;

my $THIS_FILE           =  ($0 =~ /^.*\/(.*)$/)[0];
my $running_directory   =  ($0 =~ /^(.*?)\/$THIS_FILE$/)[0];
if (($running_directory =~ /^\./) && ($ENV{PWD}))
{
	$running_directory =~ s/^\./$ENV{PWD}/;
}

# Turn off buffering so that the pinwheel will display while waiting for the SSH call(s) to complete.
$| = 1;

my $anvil = Anvil::Tools->new();

# Read switches
$anvil->Get->switches({list => [
	"detailed",
	"interval", 
	"print", 
	"run-once",
], man => $THIS_FILE});
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => $anvil->data->{switches}});
$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 2, secure => 0, key => "log_0115", variables => { program => $THIS_FILE }});

# Calculate my sum so that we can exit if it changes later.
$anvil->Storage->record_md5sums;
my $next_md5sum_check = time + 30;

our $interval = $anvil->data->{switches}{interval} =~ /^\d+$/ ? $anvil->data->{switches}{interval} : 5;
our $print    = $anvil->data->{switches}{'print'}  ? 1 : 0;
our $detailed = $anvil->data->{switches}{detailed} ? 1 : 0;


# Now go into the main loop
while(1)
{
	my $scan_time = time;
	
	record_data($anvil);
	
	if ($anvil->data->{switches}{'run-once'})
	{
		# We're done.
		$anvil->nice_exit({exit_code => 0});
	}
	
	if (time > $next_md5sum_check)
	{
		$next_md5sum_check = time + 30;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { next_md5sum_check => $next_md5sum_check }});
		if ($anvil->Storage->check_md5sums)
		{
			# NOTE: We exit with '0' to prevent systemctl from showing a scary red message.
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, priority => "alert", key => "message_0014"});
			$anvil->nice_exit({exit_code => 0});
		}
	}
	
	sleep $interval;
}


sub record_data
{
	my ($anvil) = @_;
	
	$anvil->Get->load_average({debug => 2});

	# Show the CPU load percents.
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => $print, level => 1, key => "log_0840", variables => { 
		iowait   => $anvil->data->{loads}{load_percent}{iowait},
		user     => $anvil->data->{loads}{load_percent}{user}, 
		steal    => $anvil->data->{loads}{load_percent}{steal}, 
		idle     => $anvil->data->{loads}{load_percent}{idle}, 
		nice     => $anvil->data->{loads}{load_percent}{nice}, 
		'system' => $anvil->data->{loads}{load_percent}{'system'}, 
	}});

	# Show the CPU load levels
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => $print, level => 1, key => "log_0835", variables => { 
		one_minute   => $anvil->data->{loads}{load_average}{one_minute},
		five_minutes => $anvil->data->{loads}{load_average}{five_minute},
		ten_minutes  => $anvil->data->{loads}{load_average}{ten_minute},
	}});

	# Show the processes
	my $key = $detailed ? "log_0841" : "log_0836";
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => $print, level => 1, key => $key, variables => { 
		total      => $anvil->Convert->add_commas({number => $anvil->data->{loads}{processes}{total}}), 
		running    => $anvil->Convert->add_commas({number => $anvil->data->{loads}{processes}{running}}),
		blocked    => $anvil->Convert->add_commas({number => $anvil->data->{loads}{processes}{blocked}}),
		interrupts => $anvil->Convert->add_commas({number => $anvil->data->{loads}{interrupts}{total}}),
	}});
	
	if ($detailed)
	{
		# CPU average load times
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => $print, level => 1, key => "log_0837", variables => { 
			io_wait        => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{average}{io_wait} / 100)}), 
			user_mode      => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{average}{user_mode} / 100)}), 
			user_mode_nice => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{average}{user_mode_nice} / 100)}), 
			system_mode    => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{average}{system_mode} / 100)}), 
			idle_tasks     => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{average}{idle_tasks} / 100)}), 
			hard_irq       => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{average}{hard_irq} / 100)}), 
			soft_irq       => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{average}{soft_irq} / 100)}), 
		}});

		# Show per-cores
		foreach my $core (sort {$a <=> $b} keys %{$anvil->data->{loads}{cpu}{core}})
		{
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => $print, level => 1, key => "log_0838", variables => { 
				core           => $core, 
				user_mode      => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{core}{$core}{user_mode} / 100)}), 
				user_mode_nice => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{core}{$core}{user_mode_nice} / 100)}), 
				system_mode    => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{core}{$core}{system_mode} / 100)}), 
				idle_tasks     => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{core}{$core}{idle_tasks} / 100)}), 
				hard_irq       => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{core}{$core}{hard_irq} / 100)}), 
				soft_irq       => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{cpu}{core}{$core}{soft_irq} / 100)}), 
			}});
		}

		# This is the number of IO operations in progress. When IOs in progress is non-zero, the weighted time (in 1/100ths of a second), doing those IOs.
		foreach my $device_name (sort {$a cmp $b} keys %{$anvil->data->{loads}{storage}})
		{
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => $print, level => 1, key => "log_0839", variables => { 
				device_name         => $device_name, 
				in_progress         => $anvil->data->{loads}{storage}{$device_name}{ios_currently_in_progress}, 
				weighted_time_spent => $anvil->Convert->add_commas({number => ($anvil->data->{loads}{storage}{$device_name}{weighted_time_spent_doing_ios} / 100)}), 
			}});
		}
	}
	
	return(0);
}