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|
<?php
namespace Engelsystem\Controllers\Metrics;
use Engelsystem\Renderer\EngineInterface;
class MetricsEngine implements EngineInterface
{
/**
* Render metrics
*
* @param string $path
* @param mixed[] $data
* @return string
*
* @example $data = ['foo' => [['labels' => ['foo'=>'bar'], 'value'=>42]], 'bar'=>123]
*/
public function get(string $path, array $data = []): string
{
$return = [];
foreach ($data as $name => $list) {
if (is_int($name)) {
$return[] = '# ' . $this->escape($list);
continue;
}
$list = is_array($list) ? $list : [$list];
$name = 'engelsystem_' . $name;
if (isset($list['help'])) {
$return[] = sprintf('# HELP %s %s', $name, $this->escape($list['help']));
unset($list['help']);
}
if (isset($list['type'])) {
$return[] = sprintf('# TYPE %s %s', $name, $list['type']);
unset($list['type']);
}
$list = (!isset($list['value']) || !isset($list['labels'])) ? $list : [$list];
foreach ($list as $row) {
$row = is_array($row) ? $row : [$row];
$return[] = $this->formatData($name, $row);
}
}
return implode("\n", $return);
}
/**
* @param string $path
* @return bool
*/
public function canRender(string $path): bool
{
return $path == '/metrics';
}
/**
* @param string $name
* @param array|mixed $row
* @return string
* @see https://prometheus.io/docs/instrumenting/exposition_formats/
*/
protected function formatData($name, $row): string
{
return sprintf(
'%s%s %s',
$name,
$this->renderLabels($row),
$this->renderValue($row)
);
}
/**
* @param array|mixed $row
* @return mixed
*/
protected function renderLabels($row): string
{
$labels = [];
if (!is_array($row) || empty($row['labels'])) {
return '';
}
foreach ($row['labels'] as $type => $value) {
$labels[$type] = $type . '="' . $this->formatValue($value) . '"';
}
return '{' . implode(',', $labels) . '}';
}
/**
* @param array|mixed $row
* @return mixed
*/
protected function renderValue($row)
{
if (isset($row['value'])) {
return $this->formatValue($row['value']);
}
return $this->formatValue(array_pop($row));
}
/**
* @param mixed $value
* @return mixed
*/
protected function formatValue($value)
{
if (is_bool($value)) {
return (int)$value;
}
return $this->escape($value);
}
/**
* @param mixed $value
* @return mixed
*/
protected function escape($value)
{
$replace = [
'\\' => '\\\\',
'"' => '\\"',
"\n" => '\\n',
];
return str_replace(
array_keys($replace),
array_values($replace),
$value
);
}
/**
* Does nothing as shared data will onyly result in unexpected behaviour
*
* @param string|mixed[] $key
* @param mixed $value
*/
public function share($key, $value = null) { }
}
|
