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phab/src/applications/daemon/management/PhabricatorDaemonManagementWorkflow.php
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PhabricatorDaemonManagementWorkflow.php
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<?php
abstract class PhabricatorDaemonManagementWorkflow
extends PhabricatorManagementWorkflow {
private $runDaemonsAsUser = null;
final protected function loadAvailableDaemonClasses() {
return id(new PhutilSymbolLoader())
->setAncestorClass('PhutilDaemon')
->setConcreteOnly(true)
->selectSymbolsWithoutLoading();
}
final protected function getPIDDirectory() {
$path = PhabricatorEnv::getEnvConfig('phd.pid-directory');
return $this->getControlDirectory($path);
}
final protected function getLogDirectory() {
$path = PhabricatorEnv::getEnvConfig('phd.log-directory');
return $this->getControlDirectory($path);
}
private function getControlDirectory($path) {
if (!Filesystem::pathExists($path)) {
list($err) = exec_manual('mkdir -p %s', $path);
if ($err) {
throw new Exception(
pht(
"%s requires the directory '%s' to exist, but it does not exist ".
"and could not be created. Create this directory or update ".
"'%s' / '%s' in your configuration to point to an existing ".
"directory.",
'phd',
$path,
'phd.pid-directory',
'phd.log-directory'));
}
}
return $path;
}
final protected function loadRunningDaemons() {
$daemons = array();
$pid_dir = $this->getPIDDirectory();
$pid_files = Filesystem::listDirectory($pid_dir);
foreach ($pid_files as $pid_file) {
$path = $pid_dir.'/'.$pid_file;
$daemons[] = PhabricatorDaemonReference::loadReferencesFromFile($path);
}
return array_mergev($daemons);
}
final protected function loadAllRunningDaemons() {
$local_daemons = $this->loadRunningDaemons();
$local_ids = array();
foreach ($local_daemons as $daemon) {
$daemon_log = $daemon->getDaemonLog();
if ($daemon_log) {
$local_ids[] = $daemon_log->getID();
}
}
$daemon_query = id(new PhabricatorDaemonLogQuery())
->setViewer(PhabricatorUser::getOmnipotentUser())
->withStatus(PhabricatorDaemonLogQuery::STATUS_ALIVE);
if ($local_ids) {
$daemon_query->withoutIDs($local_ids);
}
$remote_daemons = $daemon_query->execute();
return array_merge($local_daemons, $remote_daemons);
}
private function findDaemonClass($substring) {
$symbols = $this->loadAvailableDaemonClasses();
$symbols = ipull($symbols, 'name');
$match = array();
foreach ($symbols as $symbol) {
if (stripos($symbol, $substring) !== false) {
if (strtolower($symbol) == strtolower($substring)) {
$match = array($symbol);
break;
} else {
$match[] = $symbol;
}
}
}
if (count($match) == 0) {
throw new PhutilArgumentUsageException(
pht(
"No daemons match '%s'! Use '%s' for a list of available daemons.",
$substring,
'phd list'));
} else if (count($match) > 1) {
throw new PhutilArgumentUsageException(
pht(
"Specify a daemon unambiguously. Multiple daemons match '%s': %s.",
$substring,
implode(', ', $match)));
}
return head($match);
}
final protected function launchDaemons(
array $daemons,
$debug,
$run_as_current_user = false) {
// Convert any shorthand classnames like "taskmaster" into proper class
// names.
foreach ($daemons as $key => $daemon) {
$class = $this->findDaemonClass($daemon['class']);
$daemons[$key]['class'] = $class;
}
$console = PhutilConsole::getConsole();
if (!$run_as_current_user) {
// Check if the script is started as the correct user
$phd_user = PhabricatorEnv::getEnvConfig('phd.user');
$current_user = posix_getpwuid(posix_geteuid());
$current_user = $current_user['name'];
if ($phd_user && $phd_user != $current_user) {
if ($debug) {
throw new PhutilArgumentUsageException(
pht(
"You are trying to run a daemon as a nonstandard user, ".
"and `%s` was not able to `%s` to the correct user. \n".
'Phabricator is configured to run daemons as "%s", '.
'but the current user is "%s". '."\n".
'Use `%s` to run as a different user, pass `%s` to ignore this '.
'warning, or edit `%s` to change the configuration.',
'phd',
'sudo',
$phd_user,
$current_user,
'sudo',
'--as-current-user',
'phd.user'));
} else {
$this->runDaemonsAsUser = $phd_user;
$console->writeOut(pht('Starting daemons as %s', $phd_user)."\n");
}
}
}
$this->printLaunchingDaemons($daemons, $debug);
$trace = PhutilArgumentParser::isTraceModeEnabled();
$flags = array();
if ($trace || PhabricatorEnv::getEnvConfig('phd.trace')) {
$flags[] = '--trace';
}
if ($debug || PhabricatorEnv::getEnvConfig('phd.verbose')) {
$flags[] = '--verbose';
}
$instance = PhabricatorEnv::getEnvConfig('cluster.instance');
if ($instance) {
$flags[] = '-l';
$flags[] = $instance;
}
$config = array();
if (!$debug) {
$config['daemonize'] = true;
}
if (!$debug) {
$config['log'] = $this->getLogDirectory().'/daemons.log';
}
$pid_dir = $this->getPIDDirectory();
// TODO: This should be a much better user experience.
Filesystem::assertExists($pid_dir);
Filesystem::assertIsDirectory($pid_dir);
Filesystem::assertWritable($pid_dir);
$config['piddir'] = $pid_dir;
$config['daemons'] = $daemons;
$command = csprintf('./phd-daemon %Ls', $flags);
$phabricator_root = dirname(phutil_get_library_root('phabricator'));
$daemon_script_dir = $phabricator_root.'/scripts/daemon/';
if ($debug) {
// Don't terminate when the user sends ^C; it will be sent to the
// subprocess which will terminate normally.
pcntl_signal(
SIGINT,
array(__CLASS__, 'ignoreSignal'));
echo "\n phabricator/scripts/daemon/ \$ {$command}\n\n";
$tempfile = new TempFile('daemon.config');
Filesystem::writeFile($tempfile, json_encode($config));
phutil_passthru(
'(cd %s && exec %C < %s)',
$daemon_script_dir,
$command,
$tempfile);
} else {
try {
$this->executeDaemonLaunchCommand(
$command,
$daemon_script_dir,
$config,
$this->runDaemonsAsUser);
} catch (Exception $ex) {
throw new PhutilArgumentUsageException(
pht(
'Daemons are configured to run as user "%s" in configuration '.
'option `%s`, but the current user is "%s" and `phd` was unable '.
'to switch to the correct user with `sudo`. Command output:'.
"\n\n".
'%s',
$phd_user,
'phd.user',
$current_user,
$ex->getMessage()));
}
}
}
private function executeDaemonLaunchCommand(
$command,
$daemon_script_dir,
array $config,
$run_as_user = null) {
$is_sudo = false;
if ($run_as_user) {
// If anything else besides sudo should be
// supported then insert it here (runuser, su, ...)
$command = csprintf(
'sudo -En -u %s -- %C',
$run_as_user,
$command);
$is_sudo = true;
}
$future = new ExecFuture('exec %C', $command);
// Play games to keep 'ps' looking reasonable.
$future->setCWD($daemon_script_dir);
$future->write(json_encode($config));
list($stdout, $stderr) = $future->resolvex();
if ($is_sudo) {
// On OSX, `sudo -n` exits 0 when the user does not have permission to
// switch accounts without a password. This is not consistent with
// sudo on Linux, and seems buggy/broken. Check for this by string
// matching the output.
if (preg_match('/sudo: a password is required/', $stderr)) {
throw new Exception(
pht(
'%s exited with a zero exit code, but emitted output '.
'consistent with failure under OSX.',
'sudo'));
}
}
}
public static function ignoreSignal($signo) {
return;
}
public static function requireExtensions() {
self::mustHaveExtension('pcntl');
self::mustHaveExtension('posix');
}
private static function mustHaveExtension($ext) {
if (!extension_loaded($ext)) {
echo pht(
"ERROR: The PHP extension '%s' is not installed. You must ".
"install it to run daemons on this machine.\n",
$ext);
exit(1);
}
$extension = new ReflectionExtension($ext);
foreach ($extension->getFunctions() as $function) {
$function = $function->name;
if (!function_exists($function)) {
echo pht(
"ERROR: The PHP function %s is disabled. You must ".
"enable it to run daemons on this machine.\n",
$function.'()');
exit(1);
}
}
}
/* -( Commands )----------------------------------------------------------- */
final protected function executeStartCommand(array $options) {
PhutilTypeSpec::checkMap(
$options,
array(
'keep-leases' => 'optional bool',
'force' => 'optional bool',
'reserve' => 'optional float',
));
$console = PhutilConsole::getConsole();
if (!idx($options, 'force')) {
$running = $this->loadRunningDaemons();
// This may include daemons which were launched but which are no longer
// running; check that we actually have active daemons before failing.
foreach ($running as $daemon) {
if ($daemon->isRunning()) {
$message = pht(
"phd start: Unable to start daemons because daemons are already ".
"running.\n\n".
"You can view running daemons with '%s'.\n".
"You can stop running daemons with '%s'.\n".
"You can use '%s' to stop all daemons before starting ".
"new daemons.\n".
"You can force daemons to start anyway with %s.",
'phd status',
'phd stop',
'phd restart',
'--force');
$console->writeErr("%s\n", $message);
exit(1);
}
}
}
if (idx($options, 'keep-leases')) {
$console->writeErr("%s\n", pht('Not touching active task queue leases.'));
} else {
$console->writeErr("%s\n", pht('Freeing active task leases...'));
$count = $this->freeActiveLeases();
$console->writeErr(
"%s\n",
pht('Freed %s task lease(s).', new PhutilNumber($count)));
}
$daemons = array(
array(
'class' => 'PhabricatorRepositoryPullLocalDaemon',
),
array(
'class' => 'PhabricatorTriggerDaemon',
),
array(
'class' => 'PhabricatorTaskmasterDaemon',
'autoscale' => array(
'group' => 'task',
'pool' => PhabricatorEnv::getEnvConfig('phd.taskmasters'),
'reserve' => idx($options, 'reserve', 0),
),
),
);
$this->launchDaemons($daemons, $is_debug = false);
$console->writeErr("%s\n", pht('Done.'));
return 0;
}
final protected function executeStopCommand(
array $pids,
array $options) {
$console = PhutilConsole::getConsole();
$grace_period = idx($options, 'graceful', 15);
$force = idx($options, 'force');
$gently = idx($options, 'gently');
if ($gently && $force) {
throw new PhutilArgumentUsageException(
pht(
'You can not specify conflicting options %s and %s together.',
'--gently',
'--force'));
}
$daemons = $this->loadRunningDaemons();
if (!$daemons) {
$survivors = array();
if (!$pids && !$gently) {
$survivors = $this->processRogueDaemons(
$grace_period,
$warn = true,
$force);
}
if (!$survivors) {
$console->writeErr(
"%s\n",
pht('There are no running Phabricator daemons.'));
}
return 0;
}
$stop_pids = $this->selectDaemonPIDs($daemons, $pids);
if (!$stop_pids) {
$console->writeErr("%s\n", pht('No daemons to kill.'));
return 0;
}
$survivors = $this->sendStopSignals($stop_pids, $grace_period);
// Try to clean up PID files for daemons we killed.
$remove = array();
foreach ($daemons as $daemon) {
$pid = $daemon->getPID();
if (empty($stop_pids[$pid])) {
// We did not try to stop this overseer.
continue;
}
if (isset($survivors[$pid])) {
// We weren't able to stop this overseer.
continue;
}
if (!$daemon->getPIDFile()) {
// We don't know where the PID file is.
continue;
}
$remove[] = $daemon->getPIDFile();
}
foreach (array_unique($remove) as $remove_file) {
Filesystem::remove($remove_file);
}
if (!$gently) {
$this->processRogueDaemons($grace_period, !$pids, $force);
}
return 0;
}
final protected function executeReloadCommand(array $pids) {
$console = PhutilConsole::getConsole();
$daemons = $this->loadRunningDaemons();
if (!$daemons) {
$console->writeErr(
"%s\n",
pht('There are no running daemons to reload.'));
return 0;
}
$reload_pids = $this->selectDaemonPIDs($daemons, $pids);
if (!$reload_pids) {
$console->writeErr(
"%s\n",
pht('No daemons to reload.'));
return 0;
}
foreach ($reload_pids as $pid) {
$console->writeOut(
"%s\n",
pht('Reloading process %d...', $pid));
posix_kill($pid, SIGHUP);
}
return 0;
}
private function processRogueDaemons($grace_period, $warn, $force_stop) {
$console = PhutilConsole::getConsole();
$rogue_daemons = PhutilDaemonOverseer::findRunningDaemons();
if ($rogue_daemons) {
if ($force_stop) {
$rogue_pids = ipull($rogue_daemons, 'pid');
$survivors = $this->sendStopSignals($rogue_pids, $grace_period);
if ($survivors) {
$console->writeErr(
"%s\n",
pht(
'Unable to stop processes running without PID files. '.
'Try running this command again with sudo.'));
}
} else if ($warn) {
$console->writeErr("%s\n", $this->getForceStopHint($rogue_daemons));
}
}
return $rogue_daemons;
}
private function getForceStopHint($rogue_daemons) {
$debug_output = '';
foreach ($rogue_daemons as $rogue) {
$debug_output .= $rogue['pid'].' '.$rogue['command']."\n";
}
return pht(
"There are processes running that look like Phabricator daemons but ".
"have no corresponding PID files:\n\n%s\n\n".
"Stop these processes by re-running this command with the %s parameter.",
$debug_output,
'--force');
}
private function sendStopSignals($pids, $grace_period) {
// If we're doing a graceful shutdown, try SIGINT first.
if ($grace_period) {
$pids = $this->sendSignal($pids, SIGINT, $grace_period);
}
// If we still have daemons, SIGTERM them.
if ($pids) {
$pids = $this->sendSignal($pids, SIGTERM, 15);
}
// If the overseer is still alive, SIGKILL it.
if ($pids) {
$pids = $this->sendSignal($pids, SIGKILL, 0);
}
return $pids;
}
private function sendSignal(array $pids, $signo, $wait) {
$console = PhutilConsole::getConsole();
$pids = array_fuse($pids);
foreach ($pids as $key => $pid) {
if (!$pid) {
// NOTE: We must have a PID to signal a daemon, since sending a signal
// to PID 0 kills this process.
unset($pids[$key]);
continue;
}
switch ($signo) {
case SIGINT:
$message = pht('Interrupting process %d...', $pid);
break;
case SIGTERM:
$message = pht('Terminating process %d...', $pid);
break;
case SIGKILL:
$message = pht('Killing process %d...', $pid);
break;
}
$console->writeOut("%s\n", $message);
posix_kill($pid, $signo);
}
if ($wait) {
$start = PhabricatorTime::getNow();
do {
foreach ($pids as $key => $pid) {
if (!PhabricatorDaemonReference::isProcessRunning($pid)) {
$console->writeOut(pht('Process %d exited.', $pid)."\n");
unset($pids[$key]);
}
}
if (empty($pids)) {
break;
}
usleep(100000);
} while (PhabricatorTime::getNow() < $start + $wait);
}
return $pids;
}
private function freeActiveLeases() {
$task_table = id(new PhabricatorWorkerActiveTask());
$conn_w = $task_table->establishConnection('w');
queryfx(
$conn_w,
'UPDATE %T SET leaseExpires = UNIX_TIMESTAMP()
WHERE leaseExpires > UNIX_TIMESTAMP()',
$task_table->getTableName());
return $conn_w->getAffectedRows();
}
private function printLaunchingDaemons(array $daemons, $debug) {
$console = PhutilConsole::getConsole();
if ($debug) {
$console->writeOut(pht('Launching daemons (in debug mode):'));
} else {
$console->writeOut(pht('Launching daemons:'));
}
$log_dir = $this->getLogDirectory().'/daemons.log';
$console->writeOut(
"\n%s\n\n",
pht('(Logs will appear in "%s".)', $log_dir));
foreach ($daemons as $daemon) {
$is_autoscale = isset($daemon['autoscale']['group']);
if ($is_autoscale) {
$autoscale = $daemon['autoscale'];
foreach ($autoscale as $key => $value) {
$autoscale[$key] = $key.'='.$value;
}
$autoscale = implode(', ', $autoscale);
$autoscale = pht('(Autoscaling: %s)', $autoscale);
} else {
$autoscale = pht('(Static)');
}
$console->writeOut(
" %s %s\n",
$daemon['class'],
$autoscale,
implode(' ', idx($daemon, 'argv', array())));
}
$console->writeOut("\n");
}
protected function getAutoscaleReserveArgument() {
return array(
'name' => 'autoscale-reserve',
'param' => 'ratio',
'help' => pht(
'Specify a proportion of machine memory which must be free '.
'before autoscale pools will grow. For example, a value of 0.25 '.
'means that pools will not grow unless the machine has at least '.
'25%%%% of its RAM free.'),
);
}
private function selectDaemonPIDs(array $daemons, array $pids) {
$console = PhutilConsole::getConsole();
$running_pids = array_fuse(mpull($daemons, 'getPID'));
if (!$pids) {
$select_pids = $running_pids;
} else {
// We were given a PID or set of PIDs to kill.
$select_pids = array();
foreach ($pids as $key => $pid) {
if (!preg_match('/^\d+$/', $pid)) {
$console->writeErr(pht("PID '%s' is not a valid PID.", $pid)."\n");
continue;
} else if (empty($running_pids[$pid])) {
$console->writeErr(
"%s\n",
pht(
'PID "%d" is not a known Phabricator daemon PID.',
$pid));
continue;
} else {
$select_pids[$pid] = $pid;
}
}
}
return $select_pids;
}
}
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