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;

	public function shouldReloadDaemons() {
	if ($this->shouldThrottle('reload', 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()));
	}

	/**
	* Check and update the configuration version.
	*
	* @return bool True if the daemons should restart, otherwise false.
	*/
	private function updateConfigVersion() {
	$old_version = $this->configVersion;
	$new_version = $this->loadConfigVersion();

	$this->configVersion = $new_version;

	// Don't trigger a reload if we're loading the config for the very
	// first time.
	if ($old_version === null) {
	return false;
	}

	return ($old_version != $new_version);
	}

	}