#!/usr/bin/env php
<?php

define('FNAME', 'publicPeers.json');
define('CACHE', 3600); // COMMENT: cache time in seconds for ping


// clone or update peers repo
if (file_exists('peers'))
	passthru('cd peers; git pull; cd ..');
else
	passthru('git clone "https://github.com/hyperboria/peers.git"');


// get peers and ping
require_once 'publicKey2ipv6.php';
$data = json_decode(@file_get_contents(FNAME), true);
if (!$data) $data = [];

foreach(get_files('peers') as $fname)
{
	$st = file_get_contents($fname);
	parse($st);
}

function get_files($dir)
{
	ob_start();
	passthru("find $dir | grep '\.k'");
	$st = ob_get_clean();
	return explode("\n", trim($st));
}

function parse($st)
{
	global $data;
	$a = json_decode($st, true);
	foreach ($a as $k => $a)
	if (time() - @$data[$k]['updated'] > CACHE)
	{
		$ip = publicKey2ipv6($a['publicKey']);
		echo "Ping $ip... ";
		exec("ping -c3 -6 -W5 $ip", $out, $res);
		$res = $res === 0 ? true : false;
		echo $res ? '[ OK ]' : '[FAIL]';
		echo "\n";
		update($k, $a, $res);
	}
}

function update($k, $a, $res)
{
	global $data;
	$a['updated'] = time();
	if ($res) $a['lastseen'] = time();
	$data[$k] = $a;
	$st = json_encode($data);
	$st = str_replace('},"', "},\n\"", $st);
	if ($st)
		file_put_contents(FNAME, $st);
}