/**
* Return an instance of the Redis class instantiated for Resque.
* @return Redis Instance of Redis.
*/
public static function redis()
{
// Detect when the PID of the current process has changed (from a fork, etc)
// and force a reconnect to redis.
$pid = getmypid();
if (self::$pid !== $pid) {
self::$redis = null;
self::$pid = $pid;
}
if (!is_null(self::$redis)) {
return self::$redis;
}
$server = self::$redisServer;
if (empty($server)) {
$server = 'localhost:6379';
}
if (is_array($server)) {
self::$redis = new RedisCluster($server);
} else {
if (strpos($server, 'unix:') === false) {
list($host, $port) = explode(':', $server);
} else {
// $server is 'unix:/tmp/redis.sock'
$host = $server;
$port = null;
}
self::$redis = new Redis($host, $port);
if (!empty(self::$redisPassword)) {
self::$redis->auth(self::$redisPassword);
}
}
self::$redis->select(self::$redisDatabase);
return self::$redis;
}
/**
* fork() helper method for php-resque that handles issues PHP socket
* and phpredis have with passing around sockets between child/parent
* processes.
*
* Will close connection to Redis before forking.
*
* @return int Return vars as per pcntl_fork()
*/
public static function fork()
{
if (!function_exists('pcntl_fork')) {
return -1;
}
// Close the connection to Redis before forking.
// This is a workaround for issues phpredis has.
self::$redis = null;
$pid = pcntl_fork();
if ($pid === -1) {
throw new RuntimeException('Unable to fork child worker.');
}
return $pid;
}