/**
* The redis extension throws an exception in response to various read, write
* and protocol errors. Sometimes it also closes the connection, sometimes
* not. The safest response for us is to explicitly destroy the connection
* object and let it be reopened during the next request.
*
* @param RedisConnRef $cref
* @param RedisException $e
*/
public function handleError(RedisConnRef $cref, RedisException $e)
{
$server = $cref->getServer();
$this->logger->error('Redis exception on server "{redis_server}"', array('redis_server' => $server, 'exception' => $e));
foreach ($this->connections[$server] as $key => $connection) {
if ($cref->isConnIdentical($connection['conn'])) {
$this->idlePoolSize -= $connection['free'] ? 1 : 0;
unset($this->connections[$server][$key]);
break;
}
}
}
/**
* Check the master link status of a Redis server that is configured as a slave.
* @param RedisConnRef $conn
* @return string|null Master link status (either 'up' or 'down'), or null
* if the server is not a slave.
*/
protected function getMasterLinkStatus(RedisConnRef $conn)
{
$info = $conn->info();
return isset($info['master_link_status']) ? $info['master_link_status'] : null;
}
/**
* @param RedisConnRef $conn
* @param string $slot
* @param float $now
* @return int|bool False on failure
*/
protected function registerAcquisitionTime(RedisConnRef $conn, $slot, $now)
{
static $script = <<<LUA
\t\tlocal kSlots,kSlotsNextRelease,kSlotWaits = unpack(KEYS)
\t\tlocal rSlot,rExpiry,rSess,rTime = unpack(ARGV)
\t\t-- If rSlot is 'w' then the client was told to wake up but got no slot
\t\tif rSlot ~= 'w' then
\t\t\t-- Update the slot "next release" time
\t\t\tredis.call('zAdd',kSlotsNextRelease,rTime + rExpiry,rSlot)
\t\t\t-- Always keep renewing the expiry on use
\t\t\tredis.call('expireAt',kSlots,math.ceil(rTime + rExpiry))
\t\t\tredis.call('expireAt',kSlotsNextRelease,math.ceil(rTime + rExpiry))
\t\tend
\t\t-- Unregister this process as waiting
\t\tredis.call('zRem',kSlotWaits,rSess)
\t\treturn 1
LUA;
return $conn->luaEval($script, [$this->getSlotListKey(), $this->getSlotRTimeSetKey(), $this->getWaitSetKey(), $slot, $this->lockTTL, $this->session, $now], 3);
}
/**
* This function should not be called outside JobQueueRedis
*
* @param string $uid
* @param RedisConnRef $conn
* @return Job|bool Returns false if the job does not exist
* @throws JobQueueError
* @throws UnexpectedValueException
*/
public function getJobFromUidInternal($uid, RedisConnRef $conn)
{
try {
$data = $conn->hGet($this->getQueueKey('h-data'), $uid);
if ($data === false) {
return false;
// not found
}
$item = $this->unserialize($data);
if (!is_array($item)) {
// this shouldn't happen
throw new UnexpectedValueException("Could not find job with ID '{$uid}'.");
}
$title = Title::makeTitle($item['namespace'], $item['title']);
$job = Job::factory($item['type'], $title, $item['params']);
$job->metadata['uuid'] = $item['uuid'];
$job->metadata['timestamp'] = $item['timestamp'];
// Add in attempt count for debugging at showJobs.php
$job->metadata['attempts'] = $conn->hGet($this->getQueueKey('h-attempts'), $uid);
return $job;
} catch (RedisException $e) {
$this->throwRedisException($conn, $e);
}
}
/**
* The redis extension throws an exception in response to various read, write
* and protocol errors. Sometimes it also closes the connection, sometimes
* not. The safest response for us is to explicitly destroy the connection
* object and let it be reopened during the next request.
*
* @param RedisConnRef $cref
* @param RedisException $e
*/
public function handleError(RedisConnRef $cref, RedisException $e)
{
$server = $cref->getServer();
wfDebugLog('redis', "Redis exception on server {$server}: " . $e->getMessage() . "\n");
foreach ($this->connections[$server] as $key => $connection) {
if ($cref->isConnIdentical($connection['conn'])) {
$this->idlePoolSize -= $connection['free'] ? 1 : 0;
unset($this->connections[$server][$key]);
break;
}
}
}
/**
* This function should not be called outside JobQueueRedis
*
* @param $uid string
* @param $conn RedisConnRef
* @return Job
* @throws MWException
*/
public function getJobFromUidInternal($uid, RedisConnRef $conn)
{
try {
$item = unserialize($conn->hGet($this->getQueueKey('h-data'), $uid));
if (!is_array($item)) {
// this shouldn't happen
throw new MWException("Could not find job with ID '{$uid}'.");
}
$title = Title::makeTitle($item['namespace'], $item['title']);
$job = Job::factory($item['type'], $title, $item['params']);
$job->metadata['uuid'] = $item['uuid'];
return $job;
} catch (RedisException $e) {
$this->throwRedisException($this->server, $conn, $e);
}
}
