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<?php
namespace gipfl\IcingaCliDaemon;
use Icinga\Application\Config;
use InvalidArgumentException;
use React\EventLoop\LoopInterface;
/**
* DbResourceConfigWatch
*
* Checks every $interval = 3 seconds for changed DB resource configuration.
* Notifies registered callbacksin case this happens.
*/
class DbResourceConfigWatch
{
/** @var string */
protected $configFile;
/** @var string */
protected $resourceConfigFile;
/** @var string|null */
protected $dbResourceName;
/** @var array|null|false It's false on initialization to trigger */
protected $resourceConfig = false;
/** @var int|float */
protected $interval = 3;
/** @var callable[] */
protected $callbacks = [];
/**
* @param string $dbResourceName
* @return DbResourceConfigWatch
*/
public static function name($dbResourceName)
{
$self = new static();
$self->dbResourceName = $dbResourceName;
return $self;
}
/**
* @param string $moduleName
* @return DbResourceConfigWatch
*/
public static function module($moduleName)
{
$self = new static();
$self->configFile = Config::module($moduleName)->getConfigFile();
$self->resourceConfigFile = Config::app('resources')->getConfigFile();
return $self;
}
/**
* @param int|float $interval
* @return $this
*/
public function setInterval($interval)
{
if (! \is_int($interval) && ! \is_float($interval)) {
throw new InvalidArgumentException(
'$interval needs to be either int or float'
);
}
$this->interval = $interval;
return $this;
}
/**
* @param callable $callable
* @return $this
*/
public function notify($callable)
{
if (! \is_callable($callable)) {
throw new InvalidArgumentException('$callable needs to be callable');
}
$this->callbacks[] = $callable;
return $this;
}
/**
* @param LoopInterface $loop
*/
public function run(LoopInterface $loop)
{
$check = function () {
$this->checkForFreshConfig();
};
$loop->addPeriodicTimer($this->interval, $check);
$loop->futureTick($check);
}
protected function checkForFreshConfig()
{
if ($this->configHasBeenChanged()) {
$this->emitNewConfig($this->resourceConfig);
}
}
protected function emitNewConfig($config)
{
foreach ($this->callbacks as $callback) {
$callback($config);
}
}
protected function getResourceName()
{
if ($this->dbResourceName) {
return $this->dbResourceName;
} else {
return $this->loadDbResourceName();
}
}
protected function loadDbResourceName()
{
$parsed = @\parse_ini_file($this->configFile, true);
if (isset($parsed['db']['resource'])) {
return $parsed['db']['resource'];
} else {
return null;
}
}
protected function loadDbConfigFromDisk($name)
{
if ($name === null) {
return null;
}
$parsed = @\parse_ini_file($this->resourceConfigFile, true);
if (isset($parsed[$name])) {
$section = $parsed[$name];
\ksort($section);
return $section;
} else {
return null;
}
}
protected function configHasBeenChanged()
{
$resource = $this->loadDbConfigFromDisk($this->loadDbResourceName());
if ($resource !== $this->resourceConfig) {
$this->resourceConfig = $resource;
return true;
} else {
return false;
}
}
}
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