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phab/src/infrastructure/daemon/overseer/PhabricatorDaemonOverseerModule.php
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PhabricatorDaemonOverseerModule.php
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<?php
/**
* Overseer module.
*
* The primary purpose of this overseer module is to poll for configuration
* changes and reload daemons when the configuration changes.
*/
final class PhabricatorDaemonOverseerModule
extends PhutilDaemonOverseerModule {
private $configVersion;
private $timestamp;
public function __construct() {
$this->timestamp = PhabricatorTime::getNow();
}
public function shouldReloadDaemons() {
$now = PhabricatorTime::getNow();
$ago = ($now - $this->timestamp);
// Don't check more than once every 10 seconds.
if ($ago < 10) {
return false;
}
return $this->updateConfigVersion();
}
/**
* Calculate a version number for the current Phabricator configuration.
*
* The version number has no real meaning and does not provide any real
* indication of whether a configuration entry has been changed. The config
* version is intended to be a rough indicator that "something has changed",
* which indicates to the overseer that the daemons should be reloaded.
*
* @return int
*/
private function loadConfigVersion() {
$conn_r = id(new PhabricatorConfigEntry())->establishConnection('r');
return head(queryfx_one(
$conn_r,
'SELECT MAX(id) FROM %T',
id(new PhabricatorConfigTransaction())->getTableName()));
}
/**
* Update the configuration version and timestamp.
*
* @return bool True if the daemons should restart, otherwise false.
*/
private function updateConfigVersion() {
$config_version = $this->loadConfigVersion();
$this->timestamp = PhabricatorTime::getNow();
if (!$this->configVersion) {
$this->configVersion = $config_version;
return false;
}
if ($this->configVersion != $config_version) {
$this->configVersion = $config_version;
return true;
}
return false;
}
}
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