gnu-social/plugins/StompQueue/classes/StompQueueManager.php

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<?php
use Stomp\Client;
use Stomp\Exception\StompException;
use Stomp\Network\Connection;
use Stomp\Transport\Frame;
use Stomp\Transport\Message;
use Stomp\StatefulStomp;
class StompQueueManager extends QueueManager
{
protected $pl = null;
protected $stomps = null;
protected $transaction;
protected $transactionCount;
protected $activeGroups;
public function __construct($pl)
{
parent::__construct();
$this->pl = $pl;
}
/**
* Initialize our connection and subscribe to all the queues
* we're going to need to handle... If multiple queue servers
* are configured for failover, we'll listen to all of them.
*
* Side effects: in multi-site mode, may reset site configuration.
*
* @param IoMaster $master process/event controller
* @return bool return false on failure
* @throws ServerException
*/
public function start($master)
{
parent::start($master);
return $this->_ensureConn();
}
/**
* Close out any active connections.
*
* @return bool return false on failure
* @throws Exception
*/
public function finish()
{
foreach ($this->stomps as $idx => $stomp) {
common_log(LOG_INFO, "Unsubscribing on: " . $stomp->getClient()->getConnection()->getHost());
$stomp->unsubscribe();
}
// If there are any outstanding delivered messages we haven't processed,
// free them for another thread to take.
foreach ($this->stomps as $i => $st) {
if ($st) {
$this->rollback($i);
$st->getClient()->disconnect();
$this->stomps[$i] = null;
}
}
return true;
}
/**
* Lazy open connections to all STOMP servers, if in manual failover
* mode. This means the queue servers don't speak to each other, so
* we have to listen to all of them to make sure we get all events.
*/
private function _ensureConn()
{
if ($this->stomps === null) {
if (!$this->pl->manualFailover) {
$list = $this->pl->servers;
if (count($list) > 1) {
shuffle($list); // Randomize to spread load
$url = 'failover://(' . implode(',', $list) . ')';
} else {
$url = $list[0];
}
$st = $this->_doConnect($url);
$this->stomps = [$st];
$this->transactionCount = [0];
$this->transaction = [null];
$this->disconnect = [null];
} else {
$this->stomps = [];
$this->transactionCount = [];
$this->transaction = [];
foreach ($this->pl->servers as $_ => $url) {
try {
$this->stomps[] = $this->_doConnect($url);
$this->disconnect[] = null; // If the previous succeeded
} catch (Exception $e) {
// s'okay, we'll live
$this->stomps[] = null;
$this->disconnect[] = time();
}
$this->transactionCount[] = 0;
$this->transaction[] = null;
}
}
// Done attempting connections
if (empty($this->stomps)) {
throw new ServerException("No STOMP queue servers reachable");
} else {
foreach ($this->stomps as $i => $st) {
if ($st) {
$this->subscribe($st);
$this->begin($i);
}
}
}
}
return true;
}
protected function _doConnect($server_url)
{
common_debug("STOMP: connecting to '{$server_url}' as '{$this->pl->username}'...");
$cl = new Client($server_url);
$cl->setLogin($this->pl->username, $this->pl->password);
$cl->setVhostname($this->pl->vhost);
try {
$cl->connect();
common_debug("STOMP connected.");
} catch (StompException $e) {
common_log(LOG_ERR, 'Failed to connect to STOMP queue server');
throw new ServerException('Failed to connect to STOMP queue server');
}
return new StatefulStomp($cl);
}
/**
* Grab a full list of stomp-side queue subscriptions.
* Will include:
* - control broadcast channel
* - shared group queues for active groups
* - per-handler and per-site breakouts that are rooted in the active groups.
*
* @return array of strings
*/
protected function subscriptions(): array
{
$subs = [];
$subs[] = $this->pl->control;
foreach ($this->activeGroups as $group) {
$subs[] = $this->pl->basename . $group;
}
foreach ($this->pl->breakout as $spec) {
$parts = explode(':', $spec);
if (count($parts) < 2 || count($parts) > 3) {
common_log(LOG_ERR, "Bad queue breakout specifier '{$spec}'");
}
if (in_array($parts[0], $this->activeGroups)) {
$subs[] = $this->pl->basename . $spec;
}
}
return array_unique($subs);
}
/**
* Set up all our raw queue subscriptions on the given connection
* @param Client $st
*/
protected function subscribe(StatefulStomp $st)
{
$this->_ensureConn();
$host = $st->getClient()->getConnection()->getHost();
foreach ($this->subscriptions() as $sub) {
if (!in_array($sub, $this->subscriptions)) {
$this->_log(LOG_INFO, "Subscribing to '{$sub}' on '{$host}'");
try {
$st->subscribe($sub);
} catch (Exception $e) {
common_log(LOG_ERR, "STOMP received exception: " . get_class($e) .
" while trying to subscribe: " . $e->getMessage());
throw $e;
}
$this->subscriptions[] = $sub;
}
}
}
protected function begin($idx)
{
if ($this->pl->useTransactions) {
if (!empty($this->transaction[$idx])) {
throw new Exception("Tried to start transaction in the middle of a transaction");
}
$this->transactionCount[$idx]++;
$this->transaction[$idx] = $this->master->id . '-' . $this->transactionCount[$idx] . '-' . time();
$this->stomps[$idx]->begin($this->transaction[$idx]);
}
}
protected function ack($idx, $frame)
{
if ($this->pl->useAcks) {
if ($this->pl->useTransactions) {
if (empty($this->transaction[$idx])) {
throw new Exception("Tried to ack but not in a transaction");
}
$this->stomps[$idx]->ack($frame, $this->transaction[$idx]);
} else {
$this->stomps[$idx]->ack($frame);
}
}
}
protected function commit($idx)
{
if ($this->useTransactions) {
if (empty($this->transaction[$idx])) {
throw new Exception("Tried to commit but not in a transaction");
}
$this->stomps[$idx]->commit($this->transaction[$idx]);
$this->transaction[$idx] = null;
}
}
protected function rollback($idx)
{
if ($this->useTransactions) {
if (empty($this->transaction[$idx])) {
throw new Exception("Tried to rollback but not in a transaction");
}
$this->stomps[$idx]->abort($this->transaction[$idx]);
$this->transaction[$idx] = null;
}
}
/**
* Saves an object into the queue item table.
*
* @param mixed $object
* @param string $queue
* @param string $siteNickname optional override to drop into another site's queue
* @throws Exception
*/
public function enqueue($object, $queue, $siteNickname = null)
{
$this->_ensureConn();
$idx = $this->pl->defaultIdx;
$rep = $this->logrep($object);
$envelope = ['site' => $siteNickname ?: common_config('site', 'nickname'),
'handler' => $queue,
'payload' => $this->encode($object)];
$msg = base64_encode(serialize($envelope));
$props = ['created' => common_sql_now()];
if ($this->isPersistent($queue)) {
$props['persistent'] = 'true';
}
$st = $this->stomps[$idx];
$host = $st->getClient()->getConnection()->getHost();
$target = $this->queueName($queue);
$result = $st->send($target, new Message($msg), $props);
if (!$result) {
common_log(LOG_ERR, "STOMP error sending $rep to $queue queue on $host $target");
return false;
}
common_debug("STOMP complete remote queueing $rep for queue `$queue` on host `$host` on channel `$target`");
$this->stats('enqueued', $queue);
return true;
}
/**
* Determine whether messages to this queue should be marked as persistent.
* Actual persistent storage depends on the queue server's configuration.
* @param string $queue
* @return bool
*/
protected function isPersistent($queue)
{
$mode = $this->pl->persistent;
if (is_array($mode)) {
return in_array($queue, $mode);
} else {
return (bool)$mode;
}
}
/**
* Poll every 10 seconds for new events during idle periods.
* We'll look in more often when there's data available.
* Must be greater than 0 for the poll method to be called
*
* @return int seconds
*/
public function pollInterval()
{
return 10;
}
/**
* Poll a queue and Handle an event
*
* If the queue handler reports failure, the message is requeued for later.
* Missing notices or handler classes will drop the message.
*
* Side effects: in multi-site mode, may reset site configuration to
* match the site that queued the event.
*
* @return bool success
* @throws ConfigException
* @throws NoConfigException
* @throws ServerException
* @throws StompException
*/
public function poll(): bool
{
$this->_ensureConn();
$frame = $this->stomps[$this->pl->defaultIdx]->getClient()->readFrame();
if (empty($frame)) {
return false;
}
$host = $this->stomps[$this->pl->defaultIdx]->getHost();
$message = unserialize(base64_decode($frame->body));
if ($message === false) {
common_log(LOG_ERR, "STOMP can't unserialize frame: {$frame->body}\n" .
'Unserializable frame length: ' . strlen($frame->body));
return false;
}
$site = $message['site'];
$queue = $message['handler'];
if ($this->isDeadLetter($frame, $message)) {
$this->stats('deadletter', $queue);
return false;
}
// @fixme detect failing site switches
$this->switchSite($site);
try {
$item = $this->decode($message['payload']);
} catch (Exception $e) {
common_log(LOG_ERR, "Skipping empty or deleted item in queue {$queue} from {$host}");
$this->stats('baditem', $queue);
return false;
}
$info = $this->logrep($item) . ' posted at ' .
$frame->getHeaders()['created'] . " in queue {$queue} from {$host}";
try {
$handler = $this->getHandler($queue);
$ok = $handler->handle($item);
} catch (NoQueueHandlerException $e) {
common_log(LOG_ERR, "Missing handler class; skipping $info");
$this->stats('badhandler', $queue);
return false;
} catch (Exception $e) {
common_log(LOG_ERR, "Exception on queue $queue: " . $e->getMessage());
$ok = false;
}
if ($ok) {
common_log(LOG_INFO, "Successfully handled $info");
$this->stats('handled', $queue);
} else {
common_log(LOG_WARNING, "Failed handling $info");
// Requeing moves the item to the end of the line for its next try.
// @fixme add a manual retry count
$this->enqueue($item, $queue);
$this->stats('requeued', $queue);
}
return false;
}
/**
* Check if a redelivered message has been run through enough
* that we're going to give up on it.
*
* @param Frame $frame
* @param array $message unserialized message body
* @return bool true if we should discard
*/
protected function isDeadLetter($frame, $message)
{
if (isset($frame->getHeaders()['redelivered']) && $frame->getHeaders()['redelivered'] == 'true') {
// Message was redelivered, possibly indicating a previous failure.
$msgId = $frame->getHeaders()['message-id'];
$site = $message['site'];
$queue = $message['handler'];
$msgInfo = "message $msgId for $site in queue $queue";
$deliveries = $this->incDeliveryCount($msgId);
if ($deliveries > common_config('queue', 'max_retries')) {
$info = "DEAD-LETTER FILE: Gave up after retry $deliveries on $msgInfo";
$outdir = common_config('queue', 'dead_letter_dir');
if ($outdir) {
$filename = $outdir . "/$site-$queue-" . rawurlencode($msgId);
$info .= ": dumping to $filename";
file_put_contents($filename, $message['payload']);
}
common_log(LOG_ERR, $info);
return true;
} else {
common_log(LOG_INFO, "retry $deliveries on $msgInfo");
}
}
return false;
}
/**
* Update count of times we've re-encountered this message recently,
* triggered when we get a message marked as 'redelivered'.
*
* Requires a CLI-friendly cache configuration.
*
* @param string $msgId message-id header from message
* @return int number of retries recorded
*/
function incDeliveryCount($msgId)
{
$count = 0;
$cache = Cache::instance();
if ($cache) {
$key = 'gnusocial:stomp:message-retries:' . $msgId;
$count = $cache->increment($key);
if (!$count) {
$count = 1;
$cache->set($key, $count, null, 3600);
}
}
return $count;
}
/**
* Combines the queue_basename from configuration with the
* group name for this queue to give eg:
*
* /queue/statusnet/main
* /queue/statusnet/main/distrib
* /queue/statusnet/xmpp/xmppout/site01
*
* @param string $queue
* @return string
* @throws Exception
*/
protected function queueName(string $queue): string
{
$group = $this->queueGroup($queue);
$site = GNUsocial::currentSite();
foreach (["$group:$queue:$site", "$group:$queue"] as $spec) {
if (in_array($spec, $this->breakout)) {
return $this->pl->basename . $spec;
}
}
return $this->pl->basename . $group;
}
/**
* Get the breakout mode for the given queue on the current site.
*
* @param string $queue
* @return string one of 'shared', 'handler', 'site'
*/
protected function breakoutMode($queue)
{
if (isset($this->pl->breakout[$queue])) {
return $this->pl->breakout[$queue];
} else if (isset($this->pl->breakout['*'])) {
return $this->pl->breakout['*'];
} else {
return 'shared';
}
}
/**
* Tell the i/o master we only need a single instance to cover
* all sites running in this process.
*/
public static function multiSite()
{
return IoManager::INSTANCE_PER_PROCESS;
}
/**
* Optional; ping any running queue handler daemons with a notification
* such as announcing a new site to handle or requesting clean shutdown.
* This avoids having to restart all the daemons manually to update configs
* and such.
*
* Currently only relevant for multi-site queue managers such as Stomp.
*
* @param string $event event key
* @param string $param optional parameter to append to key
* @return bool success
*/
public function sendControlSignal($event, $param = '')
{
$message = $event;
if ($param != '') {
$message .= ':' . $param;
}
$this->_ensureConn();
$st = $this->stomps[$this->pl->defaultIdx];
$result = $st->send($this->pl->control, $message, ['created' => common_sql_now()]);
if ($result) {
common_log(LOG_INFO, "Sent control ping to STOMP queue daemons: $message");
return true;
} else {
common_log(LOG_ERR, "Failed sending control ping to STOMP queue daemons: $message");
return false;
}
}
/**
* Process a control signal broadcast.
*
* @param int $idx connection index
* @param array $frame Stomp frame
* @return bool true to continue; false to stop further processing.
* @throws ConfigException
* @throws NoConfigException
* @throws ServerException
*/
protected function handleControlSignal(int $idx, $frame): bool
{
$message = trim($frame->body);
if (strpos($message, ':') !== false) {
list($event, $param) = explode(':', $message, 2);
} else {
$event = $message;
$param = '';
}
$shutdown = false;
if ($event == 'shutdown') {
$this->master->requestShutdown();
$shutdown = true;
} else if ($event == 'restart') {
$this->master->requestRestart();
$shutdown = true;
} else if ($event == 'update') {
$this->updateSiteConfig($param);
} else {
common_log(LOG_ERR, "Ignoring unrecognized control message: $message");
}
return $shutdown;
}
/**
* Switch site, if necessary, and reset current handler assignments
* @param string $site
* @throws ConfigException
* @throws NoConfigException
* @throws ServerException
*/
private function switchSite(string $site): void
{
if ($site != GNUsocial::currentSite()) {
$this->stats('switch');
GNUsocial::switchSite($site);
$this->initialize();
}
}
/**
* (Re)load runtime configuration for a given site by nickname,
* triggered by a broadcast to the 'statusnet-control' topic.
*
* Configuration changes in database should update, but config
* files might not.
*
* @param $nickname
* @return bool true to continue; false to stop further processing.
* @throws ConfigException
* @throws NoConfigException
* @throws ServerException
*/
protected function updateSiteConfig($nickname): bool
{
$sn = Status_network::getKV('nickname', $nickname);
if ($sn) {
$this->switchSite($nickname);
if (!in_array($nickname, $this->sites)) {
$this->addSite();
}
$this->stats('siteupdate');
} else {
common_log(LOG_ERR, "Ignoring ping for unrecognized new site $nickname");
}
}
};