custom-prometheus-exporter/script.php

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PHP
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<?php
require 'vendor/autoload.php';
$configFile = getenv('CONFIG_FILE') ?: 'config.php';
$cacheFile = 'twig_cache/' . hash('murmur3f', $configFile);
if (file_exists($configFile)) {
require ($configFile);
} else {
echo ("Configuration file not found: " . $configFile);
exit(1);
}
if(file_exists($cacheFile)) {
$oldconfig = json_decode(file_get_contents($cacheFile), true);
} else {
$oldconfig = [];
}
foreach ($config as $key => &$metric) {
if (!isset($metric['submetrics'])) {
$metric['submetrics'] = [$metric];
}
foreach ($metric['submetrics'] as $subkey => &$submetric) {
$pid = pcntl_fork();
if ($pid > 0) {
$pids[] = $pid;
} else {
if (isset($submetric['command'])) {
$output = null;
$retval = null;
try {
exec($submetric['command'], $output, $retval);
$output = implode("\n", $output);
} catch (Exception $e) {
$output = '';
}
} elseif (isset($submetric['http'])) {
$client = new GuzzleHttp\Client();
$options = [];
$output = NULL;
if (isset($submetric['http']['proxy'])) {
$options['proxy'] = $submetric['http']['proxy'];
}
if (isset($submetric['http']['data']) && $submetric['http']['data'] == 'responsetime') {
$options['on_stats'] = function (GuzzleHttp\TransferStats $stats) use (&$output) {
$output = $stats->getTransferTime();
};
}
$hasresponse = NULL;
try {
$res = $client->request('GET', $submetric['http']['url'], $options);
$hasresponse = true;
} catch (GuzzleHttp\Exception\GuzzleException $e) {
if (method_exists($e, 'getResponse')) {
$res = $e->getResponse();
$hasresponse = true;
} else {
$hasresponse = false;
}
}
if (isset($submetric['http']['data']) && $submetric['http']['data'] == 'responsebody') {
if ($hasresponse) {
$output = $res->getBody()->getContents();
} else {
$output = '';
}
} elseif ((isset($submetric['http']['statuscode'])) && (isset($submetric['http']['data']) && $submetric['http']['data'] == 'hasresponse')) {
if ($hasresponse) {
$output = $output = (int)in_array($res->getStatusCode(), $submetric['http']['statuscode']);;
} else {
$output = 0;
}
} elseif (isset($submetric['http']['data']) && $submetric['http']['data'] == 'hasresponse') {
$output = (int)$hasresponse;
}
}
if (isset($submetric['jsonelem'])) {
$submetric['value'] = getArrayValue($submetric['jsonelem'], json_decode($output, true));
} else {
$submetric['value'] = $output;
}
if (is_bool($submetric['value'])) $submetric['value'] = $submetric['value'] ? 1 : 0;
file_put_contents('/tmp/.metrics.' . $key . '.' . $subkey, $submetric['value']);
exit();
}
}
}
foreach ($pids as $pid) {
pcntl_waitpid($pid, $none);
}
foreach ($config as $key => &$metric) {
foreach ($metric['submetrics'] as $subkey => &$submetric) {
$submetric['value'] = file_get_contents('/tmp/.metrics.' . $key . '.' . $subkey);
if (!empty($oldconfig) && !isset($submetric['value']) && (isset($submetric['fallback']) && !empty($submetric['fallback']))) {
if (!isset($submetric['fallback']['maxage']) || time() < ($oldconfig[$key]['submetrics'][$subkey]['time'] + $submetric['fallback']['maxage'])) {
if ($submetric['fallback']['type'] == 'previous') {
$submetric['value'] = $oldconfig[$key]['submetrics'][$subkey]['value'];
} elseif ($submetric['fallback']['type'] == 'static') {
$submetric['value'] = $submetric['fallback']['value'];
}
$submetric['time'] = $oldconfig[$key]['submetrics'][$subkey]['time'];
} else {
$submetric['value'] = '';
$submetric['time'] = 0;
}
} else {
$submetric['time'] = time();
}
unlink('/tmp/.metrics.' . $key . '.' . $subkey);
}
}
file_put_contents($cacheFile, json_encode($config, JSON_PRETTY_PRINT));
$loader = new \Twig\Loader\FilesystemLoader('templates');
$twig = new \Twig\Environment($loader, [
'cache' => 'twig_cache',
]);
echo $twig->render('metrics.twig', ['config' => $config]);
function getArrayValue($elem, $array) {
$elem = explode('.', $elem);
$new_array = $array;
foreach ($elem as $i) {
if(empty($new_array)) break;
$new_array = $new_array[$i];
}
return $new_array;
}