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<?php |
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namespace ZoiloMora\ElasticAPM\Utils; |
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final class ControlGroups |
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{ |
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const PATH = '/proc/self/cgroup'; |
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/** |
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* @var self |
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*/ |
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private static $instance; |
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/** |
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* @var string|null |
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*/ |
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private $podId = null; |
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/** |
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* @var string|null |
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*/ |
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private $containerId = null; |
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/** |
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* @return self |
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*/ |
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public static function instance() |
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{ |
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if (null === self::$instance) { |
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self::$instance = new self(); |
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} |
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return self::$instance; |
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} |
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private function __construct() |
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{ |
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if (false === $this->isAllowedOperatingSystem()) { |
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return; |
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} |
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$cGroups = $this->deserialize(); |
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$this->extractInfo($cGroups); |
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} |
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/** |
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* @return string|null |
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*/ |
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public function podId() |
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{ |
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return $this->podId; |
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} |
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/** |
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* @return string|null |
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*/ |
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public function containerId() |
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{ |
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return $this->containerId; |
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} |
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/** |
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* @return bool |
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*/ |
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private function isAllowedOperatingSystem() |
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{ |
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return 'Linux' === PHP_OS; |
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} |
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/** |
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* @return array |
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*/ |
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private function deserialize() |
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{ |
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if (false === is_readable(self::PATH)) { |
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return []; |
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} |
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$cGroup = file_get_contents(self::PATH); |
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$lines = explode(PHP_EOL, $cGroup); |
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$result = []; |
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foreach ($lines as $line) { |
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list($hierarchyId, $controller, $path) = explode(':', $line); |
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$result[] = [ |
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'hierarchy_id' => $hierarchyId, |
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'controller' => $controller, |
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'path' => $path, |
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]; |
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} |
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return $result; |
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} |
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/** |
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* @param array $cGroups |
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*/ |
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private function extractInfo(array $cGroups) |
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{ |
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foreach ($cGroups as $cGroup) { |
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$path = $cGroup['path']; |
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$dirname = $this->getDirname($path); |
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$basename = $this->getBasename($path); |
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$podId = $this->extractPodId($dirname); |
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if (null !== $podId) { |
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$this->podId = $podId; |
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$this->containerId = $basename; |
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break; |
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} |
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$containerId = $this->extractContainerId($basename); |
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if (null !== $containerId) { |
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$this->containerId = $containerId; |
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} |
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} |
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} |
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/** |
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* @param string $path |
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* |
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* @return string |
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*/ |
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private function getDirname($path) |
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{ |
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$position = 1 + strrpos($path, '/'); |
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return substr($path, 0, $position); |
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} |
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/** |
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* @param string $path |
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* |
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* @return string |
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*/ |
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private function getBasename($path) |
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{ |
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$position = 1 + strrpos($path, '/'); |
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$basename = substr($path, $position); |
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if ('.scope' === substr($basename, -6)) { |
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$basename = substr($basename, 0, -6); |
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} |
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return $basename; |
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} |
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151
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/** |
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* @param string $dirname |
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* |
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* @return string|null |
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155
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*/ |
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private function extractPodId($dirname) |
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{ |
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preg_match( |
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'/(?:^\/kubepods\/[^\/]+\/pod([^\/]+)\/$)/', |
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$dirname, |
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$output |
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); |
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164
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if (0 !== count($output)) { |
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return $output[1]; |
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} |
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preg_match( |
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'/(?:^\/kubepods\.slice\/kubepods-[^\/]+\.slice\/kubepods-[^\/]+-pod([^\/]+)\.slice\/$)/', |
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$dirname, |
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$output |
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); |
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if (0 !== count($output)) { |
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return $output[1]; |
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} |
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return null; |
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} |
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/** |
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* @param string $basename |
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* |
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* @return string|null |
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*/ |
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private function extractContainerId($basename) |
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{ |
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preg_match( |
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'/^[[:xdigit:]]{64}$/', |
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$basename, |
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$output_array |
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); |
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194
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if (0 !== count($output_array)) { |
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return $output_array[0]; |
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} |
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return null; |
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} |
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200
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} |
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201
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zoilomora /
elastic-apm-agent-php
