JeroenED/custom-prometheus-exporter
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Add metrics_cache.json to gitignore and implement cache fallback logic

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The commit adds metrics_cache.json to .gitignore and implements cache fallback logic in index.php for handling metric values.
This commit is contained in:
Jeroen De Meerleer 2024-06-04 16:50:53 +02:00
parent fd8a67c23c
commit dcf62d3865
Signed by: JeroenED
GPG Key ID: 28CCCB8F62BFADD6
2 changed files with 27 additions and 2 deletions
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1
.gitignore vendored
View File

@ -1,3 +1,4 @@
config.php
vendor/
twig_cache/
metrics_cache.json

26
index.php
View File

@ -1,6 +1,11 @@
<?php
require 'vendor/autoload.php';
require 'config.php';
if(file_exists('metrics_cache.json')) {
$oldconfig = json_decode(file_get_contents('metrics_cache.json'), true);
} else {
$oldconfig = [];
}
if(php_sapi_name() == 'cli' || $_SERVER["REQUEST_URI"] == '/metrics') {
header('Content-Type: text/plain; version=0.0.4');
@ -8,7 +13,7 @@ if(php_sapi_name() == 'cli' || $_SERVER["REQUEST_URI"] == '/metrics') {
if (!isset($metric['submetrics'])) {
$metric['submetrics'] = [$metric];
}
foreach ($metric['submetrics'] as $key => &$submetric) {
foreach ($metric['submetrics'] as $subkey => &$submetric) {
if (isset($submetric['command'])) {
$output = null;
@ -70,8 +75,27 @@ if(php_sapi_name() == 'cli' || $_SERVER["REQUEST_URI"] == '/metrics') {
}
if (is_bool($submetric['value'])) $submetric['value'] = $submetric['value'] ? 1 : 0;
if(!empty($oldconfig) && empty($submetric['value']) && (isset($submetric['fallback']) && !empty($submetric['fallback']))) {
if(time() < ($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 {
$submetric['time'] = time();
}
}
}
file_put_contents('metrics_cache.json', json_encode($config, JSON_PRETTY_PRINT));
$loader = new \Twig\Loader\FilesystemLoader('templates');
$twig = new \Twig\Environment($loader, [