#!/usr/bin/perl
# 
# This server handles tasks like restoring servers on a rebuilt peer, and other (future) tasks.
# 
# Exit codes;
# 0 = Normal exit.
# 1 = No database connection.
# 
# TODO: 
# 

use strict;
use warnings;
use Anvil::Tools;
require POSIX;
use Term::Cap;
use Data::Dumper;

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 (target ([user@]host[:port]) and the file with the target's password.
$anvil->Get->switches({list => [
	"resync", 
	"server", 
	"y"
], 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, key => "log_0115", variables => { program => $THIS_FILE }});

# Connect to the database(s). If we have no connections, we'll proceed anyway as one of the 'run_once' tasks
# is to setup the database server.
$anvil->Database->connect();
$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 3, secure => 0, key => "log_0132"});
if (not $anvil->data->{sys}{database}{connections})
{
	# No databases, update the job, sleep for a bit and then exit. The daemon will pick it up and try 
	# again after we exit.
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, priority => "err", key => "error_0305"});
	sleep 10;
	$anvil->nice_exit({exit_code => 1});
}

### TODO: We don't yet run as a job. For now, the only thing this tool does is find/resync servers, which 
###       happens automatically.
# If we still don't have a job-uuit, go into interactive mode.
if ($anvil->data->{switches}{'job-uuid'})
{
	# Load the job data.
	$anvil->Job->clear();
	$anvil->Job->get_job_details();
	$anvil->Job->update_progress({
		progress         => 1,
		job_picked_up_by => $$, 
		job_picked_up_at => time, 
		message          => "message_0251", 
	});
	
	# Job data will be in $anvil->data->{jobs}{job_data}
	run_jobs($anvil);
}

if ($anvil->data->{switches}{resync})
{
	handle_resync($anvil);
}

$anvil->nice_exit({exit_code => 0});


#############################################################################################################
# Functions                                                                                                 #
#############################################################################################################

# This looks for a server (or all servers) and if any aren't found locally, they're connected.
sub handle_resync
{
	my ($anvil) = @_;
	
	# If the cluster is up and both nodes are online, make sure all DRBD resources are connected.
	$anvil->Database->get_hosts();
	$anvil->DRBD->get_status();
	my $host_uuid       = $anvil->Get->host_uuid();
	my $host_type       = $anvil->Get->host_type();
	my $short_host_name = $anvil->Get->short_host_name();
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
		host_uuid       => $host_uuid,
		host_type       => $host_type,
		short_host_name => $short_host_name, 
	}});
	if ($host_type ne "node")
	{
		# Not a node, nothing to do.
		return(0);
	}
	
	# We can only proceed if the peer is online.
	my $problem = $anvil->Cluster->parse_cib({debug => 3});
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
		problem                     => $problem,
		"cib::parsed::local::ready" => $anvil->data->{cib}{parsed}{'local'}{ready},
		"cib::parsed::peer::ready"  => $anvil->data->{cib}{parsed}{peer}{ready},
	}});
	
	if (($problem) or (not $anvil->data->{cib}{parsed}{peer}{ready}) or (not $anvil->data->{cib}{parsed}{'local'}{ready}))
	{
		# Not in the cluster, nothing to do.
		return(0);
	}
	
	# Walk through all resources and make sure the peer and local disks are attached and 
	# the connection established.
	foreach my $resource (sort {$a cmp $b} keys %{$anvil->data->{new}{resource}})
	{
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { resource => $resource }});
	}
	
	$anvil->Database->get_hosts;
	$anvil->Database->get_servers;
	
	
	return(0);
}